add support for nested lambdas

No closures for now, but solid groundwork is laid.

.github/workflows/build.yaml

@@ -1,55 +0,0 @@
-name: Sex CI
-
-on:
-  push:
-    branches: [ main ]
-  pull_request:
-    branches: [ main ]
-
-jobs:
-  build-linux:
-
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v3
-    - name: Install chicken
-      run: |
-        wget -N https://code.call-cc.org/releases/5.4.0/chicken-5.4.0.tar.gz
-        tar zxf chicken-5.4.0.tar.gz
-        sudo apt install -y make
-        make -C chicken-5.4.0 PLATFORM=linux
-        sudo make -C chicken-5.4.0 PLATFORM=linux install
-    - name: Install dependencies
-      # FIXME: [project-local deps]: use venv or something
-      # run: make deps
-      run: sudo chicken-install $(cat dependencies.txt)
-    - name: Make sure that sexc builds
-      # FIXME: sexc being built with local .eggs/ libs needs the path at runtime.
-      # Without it there will be `Error: cannot load extension: fmt`.
-      run: make sexc && ./sexc --help
-    - name: Run tests
-      # FIXME: [project-local deps]: use local deps or build with -static
-      # run: make run-tests
-      run: make sex-tests && ./sex-tests
-
-  build-macos:
-
-    runs-on: macos-15
-
-    steps:
-    - uses: actions/checkout@v3
-    - name: Install chicken
-      run: brew install chicken make
-    - name: Install dependencies
-      # FIXME: [project-local deps]: use venv or something
-      # run: make deps
-      run: chicken-install $(cat dependencies.txt)
-    - name: Make sure that sexc builds
-      # FIXME: sexc being built with local .eggs/ libs needs the path at runtime.
-      # Without it there will be `Error: cannot load extension: fmt`.
-      run: make sexc && ./sexc --help
-    - name: Run tests
-      # FIXME: [project-local deps]: use local deps or build with -static
-      # run: make run-tests
-      run: make sex-tests && ./sex-tests

.gitignore

@@ -1,4 +1,3 @@
 *.o
-*.import.scm
 sexc
 sex-tests

Makefile

@@ -1,53 +1,21 @@
 CHICKEN_C = csc
-CSC_FLAGS += -K prefix
+CSC_FLAGS = -K prefix
 
-# Order matters, since module check correctness on compilation
+MODULES = sexc fmt-c fmt-c-writer semen sex-macros sex-modules sex-reader utils
-MODULES = utils macros reader module-system semen sex-fmt-c fmt-c-writer sexc
 OBJ = $(MODULES:%=%.o)
-IMPORTS = $(MODULES:%=%.import.scm)
-LINK = $(MODULES:%=%.link)
 
-sexc: $(OBJ) main.o
+sexc: main.o $(OBJ)
 	$(CHICKEN_C) $(CSC_FLAGS) $^ -o $@
 
 main.o: main.scm
-	$(CHICKEN_C) $(CSC_FLAGS) $< -c -o $@ -link sexc
+	$(CHICKEN_C) $(CSC_FLAGS) $< -c -o $@
 
-#------------------------------------------------------------------
-
-utils.o: utils.scm
-	$(CHICKEN_C) $(CSC_FLAGS) utils.scm -e -c -J -o utils.o -unit utils
-
-macros.o: macros.scm
-	$(CHICKEN_C) $(CSC_FLAGS) macros.scm -e -c -J -o macros.o -unit macros
-
-reader.o:
-	$(CHICKEN_C) $(CSC_FLAGS) reader.scm -e -c -J -o reader.o -unit reader
-
-module-system.o: module-system.scm reader.import.scm utils.import.scm
-	$(CHICKEN_C) $(CSC_FLAGS) module-system.scm -e -c -J -o module-system.o -unit module-system -link utils
-
-semen.o: semen.scm macros.import.scm module-system.import.scm utils.import.scm
-	$(CHICKEN_C) $(CSC_FLAGS) semen.scm -e -c -J -o semen.o -unit semen -link macros -link module-system -link utils
-
-fmt-c-writer.o: fmt-c-writer.scm sex-fmt-c.import.scm utils.import.scm
-	$(CHICKEN_C) $(CSC_FLAGS) fmt-c-writer.scm -e -c -J -o fmt-c-writer.o -unit fmt-c-writer -link sex-fmt-c -link utils
-
-sexc.o: sexc.scm fmt-c-writer.import.scm macros.import.scm module-system.import.scm reader.import.scm semen.import.scm utils.import.scm
-	$(CHICKEN_C) $(CSC_FLAGS) sexc.scm -e -c -J -o sexc.o -unit sexc -link fmt-c-writer -link macros -link module-system -link reader -link semen -link utils
-
-%.link: %.o
-%.import.scm: %.o
 %.o: %.scm
-	$(CHICKEN_C) $(CSC_FLAGS) $< -e -c -J -o $@ -unit $(@:%.o=%)
+	$(CHICKEN_C) $(CSC_FLAGS) $< -e -c -o $@
-
 
 sex-tests: $(OBJ) tests/*.scm
 	cd ./tests && $(CHICKEN_C) $(CSC_FLAGS) run.scm -c -o sex-tests.o
 	$(CHICKEN_C) $(CSC_FLAGS) $(OBJ) ./tests/sex-tests.o -o sex-tests
 
 clean:
-	rm -f $(OBJ) main.o ./tests/sex-tests.o
+	rm -f $(OBJ) sexc sex-tests main.o ./tests/sex-tests.o
-	rm -f $(IMPORTS)
-	rm -f $(LINK) main.link
-	rm -f sexc sex-tests

Readme.org

@@ -1,9 +1,4 @@
 * The Sex language
-
-#+NAME: the Sex logo
-#+ATTR_HTML: :width 300px
-[[sex.png][file:./sex.png]]
-
 Sex is a S-expressions language. Sex is written in Chicken, which is a
 [[https://call-cc.org][R5RS Scheme]].
 Sex is statically typed, compiled general purpose language.
@@ -18,7 +13,7 @@ to export ~CHICKEN_INSTALL_REPOSITORY~ and ~CHICKEN_REPOSITORY_PATH~
 environment variables. Refer to the documentation for more info:
 https://wiki.call-cc.org/man/5/Extension%20tools#changing-the-repository-location
 
-~chicken-install `cat dependencies.txt`~
+~chicken-install fmt getopt-long brev-separate test tree srfi-1 srfi-13 srfi-69 matchable~
 
 ** Compilation
 ~make~
@@ -54,13 +49,13 @@ An example of Sex source:
 #+begin_src scheme
 (include stdio.h)
 
-(pub fn main ((argc int) (argv  [* const char])) int
+(pub fn int main ((int argc) (char **argv))
   (puts "Hello from Sex!")
-  (var name [char 512])
+  (var (array char 512) name)
   (puts "What is your name?")
-  (scanf "%s" (cast (& name) (* char)))
+  (scanf "%s" (cast char* &name))
   (printf "Hello, %s!\n" name)
-  (return 0))
+  0)
 #+end_src
 
 Compile and run:
@@ -106,16 +101,16 @@ return Sex code.
 (pub defmacro (list-T type)
   (let ((list-type (cat 'list- type)))
     `(struct ,list-type
-       ((value ,type)
+       ((,type value)
-        (next (* ,list-type))))))
+        ((* ,list-type) next)))))
 
 (list-T int)
 #+end_src
 ->
 #+begin_src scheme
 (struct list_int
- ((value int)
+ ((int value)
-  (next (* list_int))))
+  ((* list_int) next)))
 #+end_src
 
 **** Wrapper for checking return codes
@@ -124,19 +119,20 @@ return Sex code.
   `(if (< 0 ,call)
        (begin
          (puts ,message)
-         (return ,ret-code))))
+         (return ,ret-code)))))
 
-(pub fn init () int
+(pub fn int init ()
   (check-sdl-return
     (SDL-Init SDL-INIT-VIDEO) "Failed to initialize SDL" 1)
 ...)
 #+end_src
 ->
-#+begin_src scheme
+#+begin_src c
-(pub fn init () int
+(%fun int init ()
   (if (< 0 (SDL_Init SDL_INIT_VIDEO))
-    (begin (puts "Failed to initialize SDL") (return 1)))
+    (%begin (puts "Failed to initialize SDL") (return 1)))
   ...)
+}
 #+end_src
 
 ** Use an established environment for development

dependencies.txt

@@ -1 +0,0 @@
-fmt getopt-long brev-separate test tree srfi-1 srfi-13 srfi-69 matchable

example/fns.sex

@@ -1,10 +1,10 @@
 ;;; Prototypes
-(fn puk () void)
+(fn void puk ())
 
-(pub fn plak () void)
+(pub fn void plak ())
 
 ;;; Functions
-(fn foo () int (return 1))
+(fn int foo () (return 1))
 
-(pub fn bar ((a int) (b int)) void
+(pub fn void bar ((int a) (int b))
   (printf "%d\n" (+ a b)))

example/hello-world.sex

@@ -1,9 +1,9 @@
 (include stdio.h)
 
-(pub fn main ((argc int) (argv  [* const char])) int
+(pub fn int main ((int argc) (char **argv))
   (puts "Hello from Sex!")
-  (var name [char 512])
+  (var (array char 512) name)
   (puts "What is your name?")
-  (scanf "%s" (cast (& name) (* char)))
+  (scanf "%s" (cast char* &name))
   (printf "Hello, %s!\n" name)
   (return 0))

example/lambdas.sex

@@ -1,21 +1,21 @@
 (include stdio.h)
 
-(fn sum ((a int) (b int)) int
+(fn int sum ((int a) (int b))
   (return (+ a b)))
 
-(pub fn main () int
+(pub fn int main ()
-  (var a int 10)
+  (var int a 10)
-  (var b int 20)
+  (var int b 20)
-  (var (fn ((int) (int)) int) sum-fn sum)
+  (var (fn int ((int) (int))) sum-fn sum)
 
-  (var (fn ((int) (int)) int) sum-lambda
+  (var (fn int ((int) (int))) sum-lambda
 
-       (lambda ((a int) (b int)) int ()
+       (lambda int ((int a) (int b)) ()
          (return (+ a b))))
 
-  (var (fn ((int)) int) sum-lambda-2
+  (var (fn int ((int))) sum-lambda-2
 
-       (lambda ((a int)) int ()
+       (lambda int ((int a)) ()
          (return (+ a 20))))
 
   (printf "Hello from main fn!\n")
@@ -24,28 +24,15 @@
   (printf "Calling fn ptr: %d\n" (sum-fn a b))
   (printf "Calling lambda: %d\n" (sum-lambda a b))
   (printf "Calling other lambda: %d\n" (sum-lambda-2 a))
-  (printf "Calling lambda inplace: %d\n" ((lambda ((a int) (b int)) int ()
+  (printf "Calling lambda inplace: %d\n" ((lambda int ((int a) (int b)) ()
                                             (return (+ a b 100)))
                                           a b))
 
-  (var (fn ((int)) int) l-1
+  (var (fn int ((int))) l-1
-       (lambda ((a int)) int ()
+       (lambda int ((int a)) ()
-         (var (fn ((int)) int) l-2
+         (var (fn int ((int))) l-2
-              (lambda ((a int)) int ()
+              (lambda int ((int a)) ()
                 (return (+ 60 a))))
          (return (+ 600 (l-2 a)))))
   (printf "Calling nested lambdas: %d\n" (l-1 6))
-
-  ;; Not supported yet
-  ;; Closure
-  ;;  (var (fn (fn ((int)) int) ((int))) make-adder
-  ;;       (lambda (fn int ((int a))) ()
-  ;;         (return (lambda int ((int b)) (a)
-  ;;                   (return (+ a b))))))
-  ;;
-  ;;  (var (fn int ((int))) add-10
-  ;;       (make-adder 10))
-  ;;  (var (fn int ((int))) add-20
-  ;;       (make-adder 20))
-  ;;  (printf "Calling closures: %d\n" (add-10 24))
   (return 0))

example/list.sex

@@ -1,21 +1,21 @@
 (pub defmacro (list-T type)
   (let ((list-type (cat 'list- type)))
     `(struct ,list-type
-       ((value ,type)
+       ((,type value)
-        (next (* struct ,list-type))))))
+        ((* (struct ,list-type)) next)))))
 
 (pub defmacro (make-list-T type is-public?)
   (let ((list-type (list 'struct (cat 'list- type)))
         (fn-name (cat 'make-list- type)))
-    `(,@(if is-public? '(pub) '()) fn ,fn-name () (* ,list-type)
+    `(,@(if is-public? '(pub) '()) fn (* ,list-type) ,fn-name ()
-      (var list (* ,list-type) (cast  (malloc (sizeof ,list-type)) (* ,list-type)))
+      (var (* ,list-type) list (cast (* ,list-type) (malloc (sizeof ,list-type))))
       (= (-> list next) NULL)
       (return list))))
 
 (pub defmacro (add-value-list-T type is-public?)
   (let ((list-type (list 'struct (cat 'list- type)))
         (fn-name (cat 'add-value-list- type)))
-    `(,@(if is-public? '(pub) '()) fn ,fn-name ((list * ,list-type) (value ,type)) void
+    `(,@(if is-public? '(pub) '()) fn void ,fn-name ((,list-type *list) (,type value))
       (while (!= (-> list next) NULL)
         (= list (-> list next)))
       (= (-> list next) (,(cat 'make-list- type)))
@@ -24,24 +24,23 @@
 (pub defmacro (length-list-T type is-public?)
   (let ((fn-name (cat 'length-list- type))
         (list-type (list 'struct (cat 'list- type))))
-    `(,@(if is-public? '(pub) '()) fn ,fn-name ((list ,(cons '* list-type))) size-t
+    `(,@(if is-public? '(pub) '()) fn size-t ,fn-name ((,list-type *list))
-      (var n size-t 0)
+      (var size-t n 0)
       (while (!= (-> list next) NULL)
         (= list (-> list next))
         (++ n))
       (return n))))
 
 (pub defmacro (is-empty-list-T type is-public?)
-  `(,@(if is-public? '(pub) '()) fn ,(cat 'is-empty-list- type)
+  `(,@(if is-public? '(pub) '()) fn bool ,(cat 'is-empty-list- type)
-    ((list ,(list '* 'struct (cat 'list- type))))
+    ((,(list 'struct (cat 'list- type)) *list))
-    bool
     (return (== (-> list next) NULL))))
 
 (pub defmacro (list-for-each list-type list-var elt-type elt-var what-do)
   (let ((list-var-2 (cat list-var '-2)))
     `(begin
-      (var ,list-var-2 (* ,list-type) ,list-var)
+      (var (pointer ,list-type) ,list-var-2 ,list-var)
-      (var ,elt-var ,elt-type (-> ,list-var-2 value))
+      (var ,elt-type ,elt-var (-> ,list-var-2 value))
       (while (!= (-> ,list-var-2 next) NULL)
         ,what-do
         (= ,list-var-2 (-> ,list-var-2 next))

example/test-list.sex

@@ -5,12 +5,12 @@
 (import list)
 
 (struct foo
-  ((a-field float)
+  ((float a-field)
-   (b int)
+   (int b)
-   (c (* const char))
+   ((const char *) c)
-   (not (fn ((val bool)) bool))))
+   ((fn bool ((bool val))) not)))
 
-(var f (struct foo))
+(var (struct foo) f)
 
 (list-T int)
 (make-list-T int #f)
@@ -18,16 +18,15 @@
 (length-list-T int #f)
 (is-empty-list-T int #f)
 
-(extern fn puk ((a int) (b float)) void)
+(extern fn void puk ((int a) (float b)))
-(pub fn baz () bool
+(pub fn bool baz () (return true))
-  (return true))
 
-(extern var i int)
+(extern var int i)
-(var j int)
+(var int j)
-(pub var k int)
+(pub var int k)
 
-(pub fn main () int
+(pub fn int main ()
-     (var l (* struct list-int) (make-list-int))
+     (var (struct list-int) *l (make-list-int))
      (printf "Size of the list: %lu\n" (length-list-int l))
      (add-value-list-int l 3)
      (add-value-list-int l 4)
@@ -36,9 +35,9 @@
        (printf "%d " v))
      (printf "\n")
      (printf "Size of the list: %lu\n" (length-list-int l))
-     (printf "%p\n" (cast l->next (* void)))
+     (printf "%p\n" (cast void* l->next))
      (return 0))
 
-(pub fn print-list ((l (* const struct list-int))) void
+(pub fn void print-list (((const struct list-int) *l))
      (list-for-each (const struct list-int) l int v (printf "%d " v))
      (printf "\n"))

fmt-c-writer.scm

@@ -1,285 +1,128 @@
 ;;; Sex fmt-c output writer
 
-(module fmt-c-writer (emit-c
+(declare (unit fmt-c-writer)
-                      sex-fmt-current-file)
+         (uses fmt-c
-  (import
+               semen))
-    scheme
-    (chicken base)
-    (chicken string)
-    (chicken syntax)
-    brev-separate
-    fmt
-    sex-fmt-c
-    matchable
-    regex
-    srfi-1                                ; lists
-    srfi-13                               ; strings
-    srfi-39                               ; parameters
-    tree
-    utils)
 
-  (define (unkebabify sym)
+(import (chicken string)
-    (case sym
+        brev-separate
-      ((-) sym)
+        fmt
-      ((--) sym)
+        regex
-      ((->) sym)
+        srfi-1                          ; lists
-      ((-=) sym)
+        srfi-13                         ; strings
-      (else
+        )
-       (string->symbol
-        (string-substitute "-(?!>)" "_"
-                           (symbol->string sym) #t)))))
 
-  (define (atom-to-fmt-c atom)
+(define (unkebabify sym)
-    (case atom
+  (case sym
-      ((fn) '%fun)
+    ((-) sym)
-      ((prototype) '%prototype)
+    ((--) sym)
-      ((begin) '%block-begin)
+    ((->) sym)
-      ((define) '%define)
+    ((-=) sym)
-      ((pointer) '%pointer)
+    (else
-      ((array) '%array)
-      ((attribute) '%attribute)
-      ((¤) 'vector-ref)
-      ((include) '%include)
-      ;; uh things we do for c89 compatibility
-      ((bool) 'int)
-      ((true) 1)
-      ((false) 0)
-      (else
-       (if (symbol? atom)
-           (unkebabify atom)
-           atom))))
-
-  (define (maybe-unwrap-type type)
-    (if (and (list? type)
-             (= 1 (length type)))
-        (car type)
-        type))
-
-  (define (make-field-access form)
-    (assert
-     (= 2 (length form)) "Wrong field access format")
-    (unkebabify
      (string->symbol
-      (fmt #f (cadr form) (car form)))))
+      (string-substitute "-(?!>)" "_"
+                         (symbol->string sym) #t)))))
 
-  (define (walk-generic-toplevel form)
+(define (atom-to-fmt-c atom)
-    (cond ((atom? form) (atom-to-fmt-c form))
+  (case atom
-          ((list? form) (map walk-generic-toplevel form))
+    ((fn) '%fun)
-          (else (error "Malformed form " form))))
+    ((prototype) '%prototype)
+    ((var) '%var)
+    ((begin) '%block-begin)
+    ((define) '%define)
+    ((pointer) '%pointer)
+    ((array) '%array)
+    ((attribute) '%attribute)
+    ((@) 'vector-ref)
+    ((include) '%include)
+    ((cast) '%cast)
+    ;; uh things we do for c89 compatibility
+    ((bool) 'int)
+    ((true) 1)
+    ((false) 0)
+    (else
+     (if (symbol? atom)
+         (unkebabify atom)
+         atom))))
 
-  (define (field-access-form? form)
+(define (make-field-access form)
-    (and (symbol? (car form))
+  (assert
-         (char=? #\. (string-ref (symbol->string (car form)) 0))))
+   (= 2 (length form)) "Wrong field access format")
+  (unkebabify
+   (string->symbol
+    (fmt #f (cadr form) (car form)))))
 
-  (define (walk-expr form)
+(define (walk-generic form acc)
-    (match form
+  (cond
-      ((? vector?)
+   ((null? form) (cons '() acc))
-       (list->vector
-        (walk-expr (vector->list form))))
-      ((? atom?)
-       (atom-to-fmt-c form))
-      ((? field-access-form?)
-       (make-field-access form))
-      (('var . _) (walk-var form))
-      (('cast expr type) (list '%cast
-                               (walk-type type)
-                               (walk-expr expr)))
-      (('enum . _) (walk-enum form))
-      ;; | is problematic... And c-or/bit-or/etc are actually
-      ;; procedures, so we have to call the procedure itself
-      (('c-or . rest) (apply c-or (map walk-expr rest)))
-      (('c-bit-or . rest) (apply c-bit-or (map walk-expr rest)))
-      (('c-bit-or= . rest) (apply c-bit-or= (map walk-expr rest)))
-      (else (map walk-expr form))))
 
-  (define (walk-var form)
+   ;; vector, e.g. {}-initializer
-    ;; (var a int) -> (%var int a)
+   ((vector? form)
-    ;; (var a (const int) 32) -> (%var (const int) a 32)
+    (cons
-    ;; (var b [const char 512]) -> (%var (%array (const char) 512) b)
+     (list->vector
-    ;; note: [...] is actually (¤ ...) after reading
+      (car (walk-generic (vector->list form) (list))))
-    ;; (var c (fn ((int) (float)) void)) -> (%var (%fun void ((int) (float))) c)
+     acc))
-    `(%var
-      ,(walk-type (third form))
-      ,(atom-to-fmt-c (second form))
-      .
-      ,(if (null? (drop form 3))
-           (list)
-           (walk-expr (drop form 3)))      ; optional init expression
-      ))
 
-  (define (walk-type form)
+   ;; atom (hopefully)
-    ;; int -> int
+   ((not (list? form)) (cons (atom-to-fmt-c form) acc))
-    ;; (const int) -> const int
-    ;; [const char 512] ->(¤ (const char) 512) -> (%array (const char) 512)
-    ;; [float 8] -> (%array float 8)
-    ;; (* const char) -> (const char *)
-    ;; (const * const * const char) -> (const char * const * const)
-    ;; (fn ((int) (float)) void) -> (%fun void ((int) (float)))
-    (match form
-      (('¤ . array-type)
-       (if (integer? (last array-type))
-           ;; sized array
-           (let* ((type-list (drop-right array-type 1))
-                  (type (maybe-unwrap-type type-list))
-                  (size (last array-type)))
-             `(%array ,(walk-type type)
-                      ,size))
-           ;; sugar for pointer... Do we really need it? Guess why not,
-           ;; it's a strong semantic cue
-           `(%array ,(walk-type (maybe-unwrap-type array-type)))))
-      (('fn arglist ret-type)
-       `(%fun ,(walk-type ret-type) ,(walk-arglist arglist)))
-      (('fn . _)
-       (assert #f "Malformed function type form"))
 
-      ;; Special case: nested structs/unions
+   ;; another special case - field access
-      ((or ('struct . _)
+   ((and (symbol? (car form))
-           ('union . _)) (walk-struct form))
+         (char=? #\. (string-ref (symbol->string (car form)) 0)))
+    (cons (make-field-access form) acc))
 
-      (('enum . _) (walk-enum form))
+   ;; toplevel, or a start of a regular list form
-      (else
+   (else
-       (type-convert-to-c form))))
+    (let ((new-acc (list)))
+      (cons (fold-right
+             walk-generic
+             new-acc
+             form)
+            acc)))))
 
-  (define (type-convert-to-c type)
+(define (normalize-fn-form form)
-    ;; Our pointers to C pointers
+  ;; (fn ret-type name arglist body) -> normal function
-    ;; int -> int
+  ;; (fn ret-type name arglist) -> prototype
-    ;; * const char -> const char *
+  (if (>= (length form) 5)
-    ;; const * const char -> const char * const
+      form
-    (if (atom? type) (atom-to-fmt-c type)
+      (cons 'prototype (cdr form))))
-        (flatten
-         (tree-map atom-to-fmt-c
-                   (flatten
-                    (list-join (reverse (list-split type '*))
-                               '(*)))))))
 
-  (define (walk-fn-def form)
+(define (walk-function form static)
-    (match form
+  (if static
-      (('fn name args ret-type . maybe-body)
+      (walk-generic (list 'static (normalize-fn-form form))
-       `(%fun
+                    (list))
-         ,(walk-type ret-type)
+      (walk-generic (normalize-fn-form (cdr form))
-         ,(atom-to-fmt-c name)
+                    (list))))
-         ,(walk-arglist args)
-         .
-         ,(walk-expr maybe-body)))))
 
-;;; TODO: isn't there a better way?
+(define (walk-extern form)
-  (define (is-probably-type form)
+  (case (cadr form)
-    (case (car form)
+    ((fn)
-      ((¤ * const volatile struct union) #t)
+     (list (cons 'extern (walk-function form #f))))
-      (else #f)))
+    ((var)
+     (list (cons 'extern (walk-generic (cdr form) (list)))))
+    (else (error "Extern what?"))))
 
-  (define (walk-arglist form)
+(define (walk-public form)
-    ;; E.g.:
+  (case (cadr form)
-    ;; ((float) (int) (const char) (* const char) (¤ (* const struct res) 32))
+    ((fn)
-    ;; ((f1 float) (f2 float) (f3 float) (res (¤ float 4)))
+     (walk-function form #f))
-    (map (fn
+    ((var)
-          (match x
+     (walk-generic (list 'static (cdr form)) (list)))
-            (('¤ . _) (walk-type x))
+    ((define defmacro import include struct typedef union var)
+     ;; ignore here, used in generating public interface
+     (process-toplevel-form (cdr form)))
+    (else
+     (error "Pub what?" (cadr form)))))
 
-            ;; yeah shitty, but I don't know yet how to determine if the
+(define (process-toplevel-form form)
-            ;; first entry is part of the type and not an argument name
+  ;; todo: rewrite to match
-            ;; :(
+  (case (car form)
-            ((? is-probably-type) (walk-type x))
+    ((fn) (walk-function form #t))
+    ((extern) (walk-extern form))
+    ((pub) (walk-public form))
+    (else (walk-generic form (list)))))
 
-            ;; 1 element args are always type
+(define (emit-c sex-forms)
-            ((_) (walk-type x))
+  (for-each (lambda (form)
-
+              (fmt #t (c-expr (car (process-toplevel-form form))) nl))
-            ((var . type) (append (list (walk-type (maybe-unwrap-type type)))
+            sex-forms))
-                                  (list (walk-type var))))))
-         form))
-
-  (define (walk-function form)
-    ;; (fn ret-type name arglist body) -> normal function
-    ;; (fn ret-type name arglist) -> prototype
-    (if (>= (length form) 5)
-        (walk-fn-def form)
-        (cons '%prototype (cdr (walk-fn-def form)))))
-
-  (define (process-struct-fields fields)
-    (map (fn
-          (let ((type (walk-type (last x))))
-            (cons type (map atom-to-fmt-c (drop-right x 1)))))
-         fields))
-
-  (define (walk-struct form)
-    (match form
-      ((type (fields ...) . attrs)        ; anonymous struct
-       `(,type ,(process-struct-fields fields)
-               . ,(tree-map atom-to-fmt-c attrs)))
-      ((type name)                        ; simple 'struct whatever', like in variable def
-       `(,type ,(atom-to-fmt-c name)))
-      ((type name (fields ...) . attrs)
-       `(,type ,(atom-to-fmt-c name)
-               ,(process-struct-fields fields)
-               . ,(tree-map atom-to-fmt-c attrs)))
-      (else (error "Malformed aggregate definition " form))))
-
-  (define (walk-enum form)
-    (match form
-      (('enum (values ...))
-       `(enum ,(map atom-to-fmt-c values)))
-      (('enum name (values ...))
-       `(enum ,(atom-to-fmt-c name) ,(map atom-to-fmt-c values)))))
-
-  (define (walk-extern form)
-    (match form
-      (('fn . _)
-       ;; extern function?.. What
-       (list 'extern (walk-function form)))
-      (('var . _)
-       (list 'extern (walk-var form)))
-      (else (error "Extern what?"))))
-
-  (define (walk-public form)
-    (match form
-      (('fn . _)
-       (walk-function form))
-      (('var . _)
-       (walk-var form))
-      ((or ('define . _)
-           ('defmacro . _)
-
-           ('import . _)
-           ('include . _)
-
-           ('struct . _)
-           ('union . _)
-
-           ('typedef . _))
-       ;; ignore here, used in generating public interface
-       (process-toplevel-form form))
-      (else
-       (error "Pub what?" (cadr form)))))
-
-  (define (process-toplevel-form form)
-    (match form
-      (('fn . _) (list 'static (walk-function form)))
-      (('var . _) (list 'static (walk-var form)))
-      (('extern . rest) (walk-extern rest))
-      (('pub . rest) (walk-public rest))
-      ((or ('struct . _)
-           ('union . _)) (walk-struct form))
-      (('enum . _) (walk-enum form))
-      (('define name . rest) `(%define ,(atom-to-fmt-c name) ,@rest))
-      (else (walk-expr form))))
-
-  (define (get-line-num form)
-    (let ((num (get-line-number form)))
-      (if (string? num)
-          (last (string-split num ":"))
-          #f)))
-
-  (define sex-fmt-current-file (make-parameter "/dev/null"))
-  (define sex-fmt-line-num (make-parameter 0))
-
-  (define (line-directive-string)
-    (fmt #f #\# "line " (sex-fmt-line-num) " " #\" (sex-fmt-current-file) #\"))
-
-  (define (emit-c sex-forms)
-    (for-each (lambda (form)
-                (let ((start-line (get-line-num form)))
-                  (when start-line
-                    (sex-fmt-line-num start-line)
-                    (fmt #t (line-directive-string) nl)))
-                (fmt #t (c-expr (process-toplevel-form form)) nl))
-              sex-forms)))

fmt-c.scm

@@ -0,0 +1,919 @@
+;;;; fmt-c.scm -- fmt module for emitting/pretty-printing C code
+;;
+;; Copyright (c) 2007 Alex Shinn.  All rights reserved.
+;; BSD-style license: http://synthcode.com/license.txt
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; additional state information
+
+(declare (unit fmt-c))
+
+(import fmt
+        srfi-13)
+
+(define (fmt-in-macro? st) (fmt-ref st 'in-macro?))
+(define (fmt-macro-params st) (fmt-ref st 'macro-params))
+(define (fmt-expression? st) (fmt-ref st 'expression?))
+(define (fmt-return? st) (fmt-ref st 'return?))
+(define (fmt-newline-before-brace? st) (fmt-ref st 'newline-before-brace?))
+(define (fmt-braceless-bodies? st) (fmt-ref st 'braceless-bodies?))
+(define (fmt-non-spaced-ops? st) (fmt-ref st 'non-spaced-ops?))
+(define (fmt-no-wrap? st) (fmt-ref st 'no-wrap?))
+(define (fmt-indent-space st) (fmt-ref st 'indent-space))
+(define (fmt-switch-indent-space st) (fmt-ref st 'switch-indent-space))
+(define (fmt-op st) (fmt-ref st 'op 'stmt))
+(define (fmt-gen st) (fmt-ref st 'gen))
+
+(define (c-in-expr proc) (fmt-let 'expression? #t proc))
+(define (c-in-stmt proc) (fmt-let 'expression? #f proc))
+(define (c-reset-newline proc) (fmt-let 'newline-before-brace? #f proc))
+
+(define (c-in-test proc) (fmt-let 'in-cond? #t (c-in-expr proc)))
+(define (c-with-op op proc) (fmt-let 'op op proc))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; be smart about operator precedence
+
+(define (c-op-precedence x)
+  (if (string? x)
+      (cond
+        ((or (string=? x ".") (string=? x "->")) 10)
+        ((or (string=? x "++") (string=? x "--")) 20)
+        ((string=? x "&") 55)
+        ((string=? x "|") 65)
+        ((string=? x "&&") 70)
+        ((string=? x "||") 75)
+        ((string=? x "|=") 85)
+        ((or (string=? x "+=") (string=? x "-=")) 85)
+        (else 95))
+      (case x
+        ;;((|::|) 5) ; C++
+        ((dot arrow post-decrement post-increment) 10)
+        ((**) 15)                       ; Perl
+        ((unary+ unary- ! ~ cast unary-* unary-& sizeof) 20) ; ++ --
+        ((=~ !~) 25)                    ; Perl
+        ((* / %) 30)
+        ((+ -) 35)
+        ((<< >>) 40)
+        ((< > <= >=) 45)
+        ((lt gt le ge) 45)              ; Perl
+        ((== !=) 50)
+        ((eq ne cmp) 50)                ; Perl
+        ((&) 55)
+        ((^) 60)
+        ;;((|\||) 65)
+        ((&& %and) 70)
+        ((%or) 75)
+        ;;((|\|\||) 75)
+        ;;((.. ...) 77)                   ; Perl
+        ((?) 80)
+        ((= *= /= %= &= ^= <<= >>=) 85) ; |\|=| ;  += -=
+        ((comma) 90)
+        ((=>) 90)                       ; Perl
+        ((not) 92)                      ; Perl
+        ((and) 93)                      ; Perl
+        ((or xor) 94)                   ; Perl
+        ((paren bracket) 100)
+        (else 95))))
+
+(define (c-op< x y) (< (c-op-precedence x) (c-op-precedence y)))
+(define (c-op<= x y) (<= (c-op-precedence x) (c-op-precedence y)))
+
+(define (c-paren x) (cat "(" (c-expr x) ")"))
+
+(define (c-maybe-paren op x)
+  (lambda (st)
+    ((fmt-let 'op op
+              (if (c-op<= (fmt-op st) op)
+                  (c-paren x)
+                  x))
+     st)))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; default literals writer
+
+(define (c-control-operator? x)
+  (memq x '(if while switch repeat do for fun begin)))
+
+(define (c-literal? x)
+  (or (number? x) (string? x) (char? x) (boolean? x)))
+
+(define (char->c-char c)
+  (string-append "'" (c-escape-char c #\') "'"))
+
+(define (c-escape-char c quote-char)
+  (let ((n (char->integer c)))
+    (if (<= 32 n 126)
+        (if (or (eqv? c quote-char) (eqv? c #\\))
+            (string #\\ c)
+            (string c))
+        (case n
+          ((7) "\\a") ((8) "\\b") ((9) "\\t") ((10) "\\n")
+          ((11) "\\v") ((12) "\\f") ((13) "\\r")
+          (else (string-append "\\x" (number->string (char->integer c) 16)))))))
+
+(define (c-format-number x)
+  (if (and (integer? x) (exact? x))
+      (lambda (st)
+        ((case (fmt-radix st)
+           ((16) (cat "0x" (string-upcase (number->string x 16))))
+           ((8) (cat "0" (number->string x 8)))
+           (else (dsp (number->string x))))
+         st))
+      (dsp (number->string x))))
+
+(define (c-format-string x)
+  (lambda (st) ((cat #\" (apply-cat (c-string-escaped x)) #\") st)))
+
+(define (c-string-escaped x)
+  (let loop ((parts '()) (idx (string-length x)))
+    (cond ((string-index-right x c-needs-string-escape? 0 idx)
+           => (lambda (special-idx)
+                (loop (cons (c-escape-char (string-ref x special-idx) #\")
+                            (cons (substring/shared x (+ special-idx 1) idx)
+                                  parts))
+                      special-idx)))
+          (else
+           (cons (substring/shared x 0 idx) parts)))))
+
+(define (c-needs-string-escape? c)
+  (if (<= 32 (char->integer c) 127) (memv c '(#\" #\\)) #t))
+
+(define (c-simple-literal x)
+  (c-wrap-stmt
+   (cond ((char? x) (dsp (char->c-char x)))
+         ((boolean? x) (dsp (if x "1" "0")))
+         ((number? x) (c-format-number x))
+         ((string? x) (c-format-string x))
+         ((null? x) (dsp "NULL"))
+         ((eof-object? x) (dsp "EOF"))
+         (else (dsp (write-to-string x))))))
+
+(define (c-literal x)
+  (lambda (st)
+    ((if (and (symbol? x) (memq x (or (fmt-macro-params st) '())))
+         (c-paren (c-simple-literal x))
+         (c-simple-literal x))
+     st)))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; default expression generator
+
+(define (c-expr/sexp x)
+  (if (procedure? x)
+      x
+      (lambda (st)
+        (cond
+         ((pair? x)
+          (case (car x)
+            ((if) ((apply c-if (cdr x)) st))
+            ((for) ((apply c-for (cdr x)) st))
+            ((while) ((apply c-while (cdr x)) st))
+            ((switch) ((apply c-switch (cdr x)) st))
+            ((case) ((apply c-case (cdr x)) st))
+            ((case/fallthrough) ((apply c-case/fallthrough (cdr x)) st))
+            ((default) ((apply c-default (cdr x)) st))
+            ((break) (c-break st))
+            ((continue) (c-continue st))
+            ((return) ((apply c-return (cdr x)) st))
+            ((goto) ((apply c-goto (cdr x)) st))
+            ((typedef) ((apply c-typedef (cdr x)) st))
+            ((struct union class) ((apply c-struct/aux x) st))
+            ((enum) ((apply c-enum (cdr x)) st))
+            ((inline auto restrict register volatile extern static)
+             ((cat (car x) " " (apply c-begin (cdr x))) st))
+            ;; non C-keywords must have some character invalid in a C
+            ;; identifier to avoid conflicts - by default we prefix %
+            ((vector-ref)
+             ((c-wrap-stmt
+               (cat (c-expr (cadr x)) "[" (c-expr (caddr x)) "]"))
+              st))
+            ((vector-set!)
+             ((c= (c-in-expr
+                   (cat (c-expr (cadr x)) "[" (c-expr (caddr x)) "]"))
+                  (c-expr (cadddr x)))
+              st))
+            ((extern/C) ((apply c-extern/C (cdr x)) st))
+            ((%apply) ((apply c-apply (cdr x)) st))
+            ((%define) ((apply cpp-define (cdr x)) st))
+            ((%include) ((apply cpp-include (cdr x)) st))
+            ((%fun) ((apply c-fun (cdr x)) st))
+            ((%cond)
+             (let lp ((ls (cdr x)) (res '()))
+               (if (null? ls)
+                   ((apply c-if (reverse res)) st)
+                   (lp (cdr ls)
+                       (cons (if (pair? (cddar ls))
+                                 (apply c-begin (cdar ls))
+                                 (cadar ls))
+                             (cons (caar ls) res))))))
+            ((%prototype) ((apply c-prototype (cdr x)) st))
+            ((%var) ((apply c-var (cdr x)) st))
+            ((%begin) ((apply c-begin (cdr x)) st))
+            ((%attribute) ((apply c-attribute (cdr x)) st))
+            ((%line) ((apply cpp-line (cdr x)) st))
+            ((%pragma %error %warning)
+             ((apply cpp-generic (substring/shared (symbol->string (car x)) 1)
+                     (cdr x)) st))
+            ((%if %ifdef %ifndef %elif)
+             ((apply cpp-if/aux (substring/shared (symbol->string (car x)) 1)
+                     (cdr x)) st))
+            ((%endif) ((apply cpp-endif (cdr x)) st))
+            ((%block-begin) ((apply c-braced-block #f (cdr x)) st))
+            ((%block) ((apply c-braced-block (cdr x)) st))
+            ((%comment) ((apply c-comment (cdr x)) st))
+            ((:) ((apply c-label (cdr x)) st))
+            ((%cast) ((apply c-cast (cdr x)) st))
+            ((+ - & * / % ! ~ ^ && < > <= >= == != << >>
+                = *= /= %= &= ^= >>= <<=) ; |\|| |\|\|| |\|=|
+             ((apply c-op x) st))
+            ((bitwise-and bit-and) ((apply c-op '& (cdr x)) st))
+            ((bitwise-ior bit-or) ((apply c-op "|" (cdr x)) st))
+            ((bitwise-xor bit-xor) ((apply c-op '^ (cdr x)) st))
+            ((bitwise-not bit-not) ((apply c-op '~ (cdr x)) st))
+            ((arithmetic-shift) ((apply c-op '<< (cdr x)) st))
+            ((bitwise-ior= bit-or=) ((apply c-op "|=" (cdr x)) st))
+            ((%and) ((apply c-op "&&" (cdr x)) st))
+            ((%or) ((apply c-op "||" (cdr x)) st))
+            ((%. %field) ((apply c-op "." (cdr x)) st))
+            ((%->) ((apply c-op "->" (cdr x)) st))
+            (else
+             (cond
+              ((eq? (car x) (string->symbol "."))
+               ((apply c-op "." (cdr x)) st))
+              ((eq? (car x) (string->symbol "->"))
+               ((apply c-op "->" (cdr x)) st))
+              ((eq? (car x) (string->symbol "++"))
+               ((apply c-op "++" (cdr x)) st))
+              ((eq? (car x) (string->symbol "--"))
+               ((apply c-op "--" (cdr x)) st))
+              ((eq? (car x) (string->symbol "+="))
+               ((apply c-op "+=" (cdr x)) st))
+              ((eq? (car x) (string->symbol "-="))
+               ((apply c-op "-=" (cdr x)) st))
+              (else ((c-apply x) st))))))
+         ((vector? x)
+          ((c-wrap-stmt
+            (fmt-try-fit
+             (fmt-let 'no-wrap? #t
+                      (cat "{" (fmt-join c-expr (vector->list x) ", ") "}"))
+             (lambda (st)
+               (let* ((col (fmt-col st))
+                      (sep (string-append "," (make-nl-space col))))
+                 ((cat "{" (fmt-join c-expr (vector->list x) sep)
+                       "}" nl)
+                  st)))))
+           st))
+         (else
+          ((c-literal x) st))))))
+
+(define (c-apply ls)
+  (c-wrap-stmt
+   (c-with-op
+    'paren
+    (cat (c-expr (car ls))
+         (let ((flat (fmt-let 'no-wrap? #t (fmt-join c-expr (cdr ls) ", "))))
+           (fmt-if
+            fmt-no-wrap?
+            (c-paren flat)
+            (c-paren
+             (fmt-try-fit
+              flat
+              (lambda (st)
+                (let* ((col (fmt-col st))
+                       (sep (string-append "," (make-nl-space col))))
+                  ((fmt-join c-expr (cdr ls) sep) st)))))))))))
+
+(define (c-expr x)
+  (lambda (st) (((or (fmt-gen st) c-expr/sexp) x) st)))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; comments, with Emacs-friendly escaping of nested comments
+
+(define (make-comment-writer st)
+  (let ((output (fmt-ref st 'writer)))
+    (lambda (str st)
+      (let ((lim (- (string-length str) 1)))
+        (let lp ((i 0) (st st))
+          (let ((j (string-index str #\/ i)))
+            (if j
+                (let ((st (if (and (> j 0)
+                                   (eqv? #\* (string-ref str (- j 1))))
+                              (output
+                               "\\/"
+                               (output (substring/shared str i j) st))
+                              (output (substring/shared str i (+ j 1)) st))))
+                  (lp (+ j 1)
+                      (if (and (< j lim) (eqv? #\* (string-ref str (+ j 1))))
+                          (output "\\" st)
+                          st)))
+                (output (substring/shared str i) st))))))))
+
+(define (c-comment . args)
+  (lambda (st)
+    ((cat "/*" (fmt-let 'writer (make-comment-writer st)
+                        (apply-cat args))
+          "*/")
+     st)))
+
+(define (make-block-comment-writer st)
+  (let ((output (make-comment-writer st))
+        (indent (string-append (make-nl-space (+ (fmt-col st) 1)) "* ")))
+    (lambda (str st)
+      (let ((lim (string-length str)))
+        (let lp ((i 0) (st st))
+          (let ((j (string-index str #\newline i)))
+            (if j
+                (lp (+ j 1)
+                    (output indent (output (substring/shared str i j) st)))
+                (output (substring/shared str i) st))))))))
+
+(define (c-block-comment . args)
+  (lambda (st)
+    (let ((col (fmt-col st))
+          (row (fmt-row st))
+          (indent (c-current-indent-string st)))
+      ((cat "/* "
+            (fmt-let 'writer (make-block-comment-writer st) (apply-cat args))
+            (lambda (st)
+              (cond
+                ((= row (fmt-row st)) ((dsp " */") st))
+                ;;((= (+ 3 col) (fmt-col st)) ((dsp "*/") st))
+                (else ((cat fl indent " */") st)))))
+       st))))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; preprocessor
+
+(define (make-cpp-writer st)
+  (let ((output (fmt-ref st 'writer)))
+    (lambda (str st)
+      (let lp ((i 0) (st st))
+        (let ((j (string-index str #\newline i)))
+          (if j
+              (lp (+ j 1)
+                  (output
+                   nl-str
+                   (output " \\" (output (substring/shared str i j) st))))
+              (output (substring/shared str i) st)))))))
+
+(define (cpp-include file)
+  (if (string? file)
+      (cat fl "#include " (wrt file) fl)
+      (cat fl "#include <" file ">" fl)))
+
+(define (list-dot x)
+  (cond ((pair? x) (list-dot (cdr x)))
+        ((null? x) #f)
+        (else x)))
+
+(define (flatten-list ls)
+  (let lp ((ls ls) (res '()))
+    (cond ((pair? ls) (lp (cdr ls) (cons (car ls) res)))
+          ((null? ls) (reverse res))
+          (else (reverse (cons ls res))))))
+
+(define (replace-tree from to x)
+  (let replace ((x x))
+    (cond ((eq? x from) to)
+          ((pair? x) (cons (replace (car x)) (replace (cdr x))))
+          (else x))))
+
+(define (cpp-define x . body)
+  (define (name-of x) (c-expr (if (pair? x) (cadr x) x)))
+  (lambda (st)
+    (let* ((body (cond
+                   ((and (pair? x) (list-dot x))
+                    => (lambda (dot)
+                         (if (eq? dot '...)
+                             body
+                             (replace-tree dot '__VA_ARGS__ body))))
+                   (else body)))
+           (params (map (lambda (x) (if (pair? x) (cadr x) x))
+                        (flatten-list (if (pair? x) (cdr x) '()))))
+           (tail
+            (if (pair? body)
+                (cat " "
+                     (fmt-let 'writer (make-cpp-writer st)
+                              (fmt-let 'macro-params params
+                                       ((if (or (not (pair? x))
+                                                (and (null? (cdr body))
+                                                     (c-literal? (car body))))
+                                            (lambda (x) x)
+                                            c-paren)
+                                        (c-in-expr (apply c-begin body))))))
+                (lambda (x) x))))
+      ((c-in-expr
+        (if (pair? x)
+            (cat fl "#define " (name-of (car x))
+                 (c-paren
+                  (fmt-join/dot name-of
+                                (lambda (dot) (dsp "..."))
+                                (cdr x)
+                                ", "))
+                 tail fl)
+            (cat fl "#define " (c-expr x) tail fl)))
+       st))))
+
+(define (cpp-expr x)
+  (if (or (symbol? x) (string? x)) (dsp x) (c-expr x)))
+
+(define (cpp-if/aux name check . o)
+  (let* ((pass (and (pair? o) (car o)))
+         (comment (if (member name '("ifdef" "ifndef"))
+                      (cat "  "
+                           (c-comment
+                            " " (if (equal? name "ifndef") "! " "")
+                            check " "))
+                      ""))
+         (endif (if pass (cat fl "#endif" comment) ""))
+         (tail (cond
+                ((and (pair? o) (pair? (cdr o)))
+                 (if (pair? (cddr o))
+                     (apply cpp-elif (cdr o))
+                     (cat (cpp-else) (cadr o) endif)))
+                (else endif))))
+    (lambda (st)
+      (let ((indent (c-current-indent-string st)))
+        ((cat fl "#" name " " (cpp-expr check) fl
+              (if pass (cat indent pass) "") fl
+              tail fl)
+         st)))))
+
+(define (cpp-if check . o)
+  (apply cpp-if/aux "if" check o))
+(define (cpp-ifdef check . o)
+  (apply cpp-if/aux "ifdef" check o))
+(define (cpp-ifndef check . o)
+  (apply cpp-if/aux "ifndef" check o))
+(define (cpp-elif check . o)
+  (apply cpp-if/aux "elif" check o))
+(define (cpp-else . o)
+  (cat fl "#else " (if (pair? o) (c-comment (car o)) "") fl))
+(define (cpp-endif . o)
+  (cat fl "#endif " (if (pair? o) (c-comment (car o)) "") fl))
+
+(define (cpp-wrap-header name . body)
+  (let ((name name)) ; consider auto-mangling
+    (cpp-ifndef name (c-begin (cpp-define name) nl (apply c-begin body) nl))))
+
+(define (cpp-line num . o)
+  (cat fl "#line " num (if (pair? o) (cat " " (car o)) "") fl))
+
+(define (cpp-generic name . ls)
+  (cat fl "#" name (apply-cat ls) fl))
+
+(define (cpp-undef . args) (apply cpp-generic "undef" args))
+(define (cpp-pragma . args) (apply cpp-generic "pragma" args))
+(define (cpp-error . args) (apply cpp-generic "error" args))
+(define (cpp-warning . args) (apply cpp-generic "warning" args))
+
+(define (cpp-stringify x)
+  (cat "#" x))
+
+(define (cpp-sym-cat . args)
+  (fmt-join dsp args " ## "))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; general indentation and brace rules
+
+(define (c-current-indent-string st . o)
+  (make-space (max 0 (+ (fmt-col st) (if (pair? o) (car o) 0)))))
+
+(define (c-indent st . o)
+  (dsp (make-space (max 0 (+ (fmt-col st) (or (fmt-indent-space st) 4)
+                             (if (pair? o) (car o) 0))))))
+
+(define (c-indent/switch st)
+  (dsp (make-space (+ (fmt-col st) (or (fmt-switch-indent-space st) 4)))))
+
+(define (c-open-brace st)
+  (if (fmt-newline-before-brace? st)
+      (begin
+        (fmt-set! st 'newline-before-brace? #t)
+        (cat "{" nl))
+      (begin
+        (fmt-set! st 'newline-before-brace? #t)
+        (cat " {" nl))))
+
+(define (c-close-brace st)
+  (dsp "}"))
+
+(define (c-wrap-stmt x)
+  (fmt-if fmt-expression?
+          (c-expr x)
+          (cat (c-in-expr (c-expr x)) ";" nl)))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; code blocks
+
+(define (c-block . args)
+  (apply c-block/aux 0 args))
+
+(define (c-block/aux offset header body0 . body)
+   (let ((inner (apply c-begin body0 body)))
+     (if (or (pair? body)
+             (not (or (c-literal? body0)
+                      (and (pair? body0)
+                           (not (c-control-operator? (car body0)))))))
+         (c-braced-block/aux offset header inner)
+         (lambda (st)
+           (if (fmt-braceless-bodies? st)
+               ((cat header fl (c-indent st offset) inner fl) st)
+               ((c-braced-block/aux offset header inner) st))))))
+
+(define (c-braced-block . args)
+  (apply c-braced-block/aux 0 args))
+
+(define (c-braced-block/aux offset header . body)
+   (lambda (st)
+     ((cat (if header header "") (c-open-brace st) (c-indent st offset)
+           (apply c-begin body) fl
+           (c-current-indent-string st offset) (c-close-brace st))
+      st)))
+
+(define (c-begin . args)
+  (apply c-begin/aux #f args))
+
+(define (c-begin/aux ret? body0 . body)
+   (if (null? body)
+       (c-expr body0)
+       (lambda (st)
+         (if (fmt-expression? st)
+             ((fmt-try-fit
+               (fmt-let 'no-wrap? #t (fmt-join c-expr (cons body0 body) ", "))
+               (lambda (st)
+                 (let ((indent (c-current-indent-string st)))
+                   ((fmt-join c-expr (cons body0 body) (cat "," nl indent)) st))))
+              st)
+             (let ((orig-ret? (fmt-return? st)))
+               ((fmt-join/last c-expr
+                               (lambda (x) (fmt-let 'return? orig-ret? (c-expr x)))
+                               (cons body0 body)
+                               (cat fl (c-current-indent-string st)))
+                (fmt-set! st 'return? (and ret? orig-ret?))))))))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; data structures
+
+(define (c-struct/aux type x . o)
+  (let* ((name (if (null? o) (if (or (symbol? x) (string? x)) x #f) x))
+         (body (if name (if (not (null? o)) (car o) '()) x))
+         (o (if (null? o) o (cdr o))))
+    (if (not (null? body))
+        (c-wrap-stmt
+         (cat
+          (c-braced-block
+           (cat type (if (and name (not (equal? name ""))) (cat " " name) ""))
+           (cat
+            (c-in-stmt
+             (if (list? body)
+                 (apply c-begin (map c-wrap-stmt (map c-field body)))
+                 (c-wrap-stmt (c-expr body))))))
+          (if (pair? o) (cat " " (apply c-begin o)) (dsp ""))))
+        (c-wrap-stmt
+         (cat type (if (and name (not (equal? name ""))) (cat " " name) ""))))))
+
+(define (c-struct . args) (apply c-struct/aux "struct" args))
+(define (c-union . args) (apply c-struct/aux "union" args))
+(define (c-class . args) (apply c-struct/aux "class" args))
+
+(define (c-enum x . o)
+  (define (c-enum-one x)
+    (if (pair? x) (cat (car x) " = " (c-expr (cadr x))) (dsp x)))
+  (let* ((name (if (null? o) (if (or (symbol? x) (string? x)) x #f) x))
+         (vals (if name (car o) x)))
+    (c-wrap-stmt
+     (cat
+      (c-braced-block
+       (if name (cat "enum " name) (dsp "enum"))
+       (c-in-expr (apply c-begin (map c-enum-one vals))))))))
+
+(define (c-attribute . args)
+  (cat "__attribute__ ((" (fmt-join c-expr args ", ") "))"))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; basic control structures
+
+(define (c-while check . body)
+  (c-reset-newline
+   (cat (c-block (cat "while (" (c-in-test (c-expr check)) ")")
+                 (c-in-stmt (apply c-begin body)))
+        fl)))
+
+(define (c-for init check update . body)
+  (c-reset-newline
+   (cat
+    (c-block
+     (c-in-expr
+      (cat "for (" (c-expr init) "; " (c-in-test (c-expr check)) "; "
+           (c-expr update ) ")"))
+     (c-in-stmt (apply c-begin body)))
+    fl)))
+
+(define (c-param x)
+  (cond
+    ((procedure? x) x)
+    ((pair? x) (c-type (car x) (cadr x)))
+    (else (error "missing type" x))))
+
+(define (c-field x)
+  (cond
+    ((procedure? x) x)
+    ((pair? x)
+     (if (list? (car x))
+         (case (caar x)
+           ((union struct class)
+            (if (> (length x) 1)
+                (c-type (car x)
+                        (cadr x))
+                (c-type (car x))))
+           (else (c-type (car x) (cadr x))))
+         (c-type (car x)
+                 (fmt-join c-expr (cdr x) ", "))))
+    (else (error "missing type" x))))
+
+(define (c-param-list ls)
+  (if (null? ls)
+      (c-type 'void)
+      (c-in-expr (fmt-join/dot c-param (lambda (dot) (dsp "...")) ls ", "))))
+
+(define (c-fun type name params . body)
+  (cat (c-block (c-in-expr (c-prototype type name params))
+                (c-in-stmt (apply c-begin body)))
+       fl))
+
+(define (c-prototype type name params . o)
+  (c-wrap-stmt
+   (cat (c-type type) " " (c-expr name) " (" (c-param-list params) ")"
+        (fmt-join/prefix c-expr o " "))))
+
+(define (c-static x) (cat "static " (c-expr x)))
+(define (c-const x) (cat "const " (c-expr x)))
+(define (c-restrict x) (cat "restrict " (c-expr x)))
+(define (c-volatile x) (cat "volatile " (c-expr x)))
+(define (c-auto x) (cat "auto " (c-expr x)))
+(define (c-inline x) (cat "inline " (c-expr x)))
+(define (c-extern x) (cat "extern " (c-expr x)))
+(define (c-extern/C . body)
+  (cat "extern \"C\" {" nl (apply c-begin body) nl "}" nl))
+
+(define (c-type type . o)
+  (let ((name (and (pair? o) (car o))))
+    (cond
+     ((pair? type)
+      (case (car type)
+        ((%fun)
+         (cat (c-type (cadr type) #f)
+              " (*" (or name "") ")("
+              (fmt-join (lambda (x) (c-type x #f)) (caddr type) ", ") ")"))
+        ((%array)
+         (let ((name (cat name "[" (if (pair? (cddr type))
+                                       (c-expr (caddr type))
+                                       "")
+                          "]")))
+           (c-type (cadr type) name)))
+        ((%pointer *)
+         (let ((name (cat "*" (if name (c-expr name) ""))))
+           (c-type (cadr type)
+                   (if (and (pair? (cadr type)) (eq? '%array (caadr type)))
+                       (c-paren name)
+                       name))))
+        ((enum) (apply c-enum name (cdr type)))
+        ((struct union class)
+         (cat (apply c-struct/aux (car type) (cdr type)) (if name (cat " " name) "")))
+        (else (fmt-join/last c-expr (lambda (x) (c-type x name)) type " "))))
+     ((not type)
+      (lambda (st) ((c-type (or (fmt-default-type st) 'int) name) st)))
+     (else
+      (cat (if (eq? '%pointer type) '* type) (if name (cat " " name) ""))))))
+
+(define (c-var type name . init)
+  (c-wrap-stmt
+   (if (pair? init)
+       (cat (c-type type name) " = " (c-expr (car init)))
+       (c-type type (if (pair? name)
+                        (fmt-join c-expr name ", ")
+                        (c-expr name))))))
+
+(define (c-cast type expr)
+  (cat "(" (c-type type) ")" (c-expr expr)))
+
+(define (c-typedef type alias . o)
+  (c-wrap-stmt
+   (cat "typedef " (c-type type alias) (fmt-join/prefix c-expr o " "))))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Generalized IF: allows multiple tail forms for if/else if/.../else
+;; blocks.  A final ELSE can be signified with a test of #t or 'else,
+;; or by simply using an odd number of expressions (by which the
+;; normal 2 or 3 clause IF forms are special cases).
+
+(define (c-if/stmt c p . rest)
+  (lambda (st)
+    (let ((indent (c-current-indent-string st)))
+      ((let lp ((c c) (p p) (ls rest))
+         (if (or (eq? c 'else) (eq? c #t))
+             (if (not (null? ls))
+                 (error "forms after else clause in IF" c p ls)
+                 (cat (c-block/aux -1 " else" p) fl))
+             (let ((tail (if (pair? ls)
+                             (if (pair? (cdr ls))
+                                 (lp (car ls) (cadr ls) (cddr ls))
+                                 (lp 'else (car ls) '()))
+                             fl)))
+               (cat (c-block/aux
+                     (if (eq? ls rest) 0 -1)
+                     (cat (if (eq? ls rest) (lambda (x) x) " else ")
+                          "if (" (c-in-test (c-expr c)) ")") p)
+                    tail))))
+       st))))
+
+(define (c-if/expr c p . rest)
+  (let lp ((c c) (p p) (ls rest))
+    (cond
+      ((or (eq? c 'else) (eq? c #t))
+       (if (not (null? ls))
+           (error "forms after else clause in IF" c p ls)
+           (c-expr p)))
+      ((pair? ls)
+       (cat (c-in-test (c-expr c)) " ? " (c-expr p) " : "
+            (if (pair? (cdr ls))
+                (lp (car ls) (cadr ls) (cddr ls))
+                (lp 'else (car ls) '()))))
+      (else
+       (c-or (c-in-test (c-expr c)) (c-expr p))))))
+
+(define (c-if . args)
+  (fmt-if fmt-expression?
+          (apply c-if/expr args)
+          (apply c-if/stmt args)))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; switch statements, automatic break handling
+
+(define (c-label name)
+  (lambda (st)
+    (let ((indent (make-space (max 0 (- (fmt-col st) 2)))))
+      ((cat fl indent name ":" fl) st))))
+
+(define c-break
+  (c-wrap-stmt (dsp "break")))
+(define c-continue
+  (c-wrap-stmt (dsp "continue")))
+(define (c-return . result)
+  (if (pair? result)
+      (c-wrap-stmt (cat "return " (c-expr (car result))))
+      (c-wrap-stmt (dsp "return"))))
+(define (c-goto label)
+  (c-wrap-stmt (cat "goto " (c-expr label))))
+
+(define (c-switch val . clauses)
+  (c-reset-newline
+   (lambda (st)
+     ((cat "switch (" (c-in-expr val) ")" (c-open-brace st)
+           (c-indent/switch st)
+           (c-in-stmt (apply c-begin/aux #t (map c-switch-clause clauses))) fl
+           (c-current-indent-string st) (c-close-brace st) fl)
+      st))))
+
+(define (c-switch-clause/breaks x)
+  (lambda (st)
+    (let* ((break?
+            (and (car x)
+                 (not (member (cadr x) '(case/fallthrough
+                                         default/fallthrough
+                                         else/fallthrough)))))
+           (explicit-case? (member (cadr x) '(case case/fallthrough)))
+           (indent (c-current-indent-string st))
+           (indent-body (c-indent st))
+           (sep (string-append ":" nl-str indent)))
+      ((cat (c-in-expr
+             (fmt-join/suffix
+              dsp
+              (cond
+               ((pair? (cadr x))
+                (map (lambda (y) (cat (dsp "case ") (c-expr y)))
+                     (cadr x)))
+               (explicit-case?
+                (map (lambda (y) (cat (dsp "case ") (c-expr y)))
+                     (if (list? (caddr x))
+                         (caddr x)
+                         (list (caddr x)))))
+               ((member (cadr x)
+                        '(default else default/fallthrough else/fallthrough))
+                (list (dsp "default")))
+               (else
+                (error
+                 "unknown switch clause, expected a list or default but got"
+                 (cadr x))))
+              sep))
+            (make-space (or (fmt-indent-space st) 4))
+            (fmt-join c-expr
+                      (if explicit-case? (cdddr x) (cddr x))
+                      indent-body)
+            (if (and break? (not (fmt-return? st)))
+                (cat fl indent-body c-break)
+                ""))
+       st))))
+
+(define (c-switch-clause x)
+  (if (procedure? x) x (c-switch-clause/breaks (cons #t x))))
+(define (c-switch-clause/no-break x)
+  (if (procedure? x) x (c-switch-clause/breaks (cons #f x))))
+
+(define (c-case x . body)
+  (c-switch-clause (cons (if (pair? x) x (list x)) body)))
+(define (c-case/fallthrough x . body)
+  (c-switch-clause/no-break (cons (if (pair? x) x (list x)) body)))
+(define (c-default . body)
+  (c-switch-clause/breaks (cons #t (cons 'else body))))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; operators
+
+(define (c-op op first . rest)
+  (if (null? rest)
+      (c-unary-op op first)
+      (apply c-binary-op op first rest)))
+
+(define (c-binary-op op . ls)
+  (define (lit-op? x) (or (c-literal? x) (symbol? x)))
+  (let ((str (display-to-string op)))
+    (c-wrap-stmt
+     (c-maybe-paren
+      op
+      (if (or (equal? str ".") (equal? str "->"))
+          (fmt-join c-expr ls str)
+          (let ((flat
+                 (fmt-let 'no-wrap? #t
+                          (lambda (st)
+                            ((fmt-join c-expr
+                                       ls
+                                       (if (and (fmt-non-spaced-ops? st)
+                                                (every lit-op? ls))
+                                           str
+                                           (string-append " " str " ")))
+                             st)))))
+            (fmt-if
+             fmt-no-wrap?
+             flat
+             (fmt-try-fit
+              flat
+              (lambda (st)
+                   ((fmt-join c-expr
+                              ls
+                              (cat nl (make-space (+ 2 (fmt-col st))) str " "))
+                    st))))))))))
+
+(define (c-unary-op op x)
+  (c-wrap-stmt
+   (cat (display-to-string op) (c-maybe-paren op (c-expr x)))))
+
+;; some convenience definitions
+
+(define (c++ . args) (apply c-op "++" args))
+(define (c-- . args) (apply c-op "--" args))
+(define (c+ . args) (apply c-op '+ args))
+(define (c- . args) (apply c-op '- args))
+(define (c* . args) (apply c-op '* args))
+(define (c/ . args) (apply c-op '/ args))
+(define (c% . args) (apply c-op '% args))
+(define (c& . args) (apply c-op '& args))
+;; (define (|c\|| . args) (apply c-op '|\|| args))
+(define (c^ . args) (apply c-op '^ args))
+(define (c~ . args) (apply c-op '~ args))
+(define (c! . args) (apply c-op '! args))
+(define (c&& . args) (apply c-op '&& args))
+;; (define (|c\|\|| . args) (apply c-op '|\|\|| args))
+(define (c<< . args) (apply c-op '<< args))
+(define (c>> . args) (apply c-op '>> args))
+(define (c== . args) (apply c-op '== args))
+(define (c!= . args) (apply c-op '!= args))
+(define (c< . args) (apply c-op '< args))
+(define (c> . args) (apply c-op '> args))
+(define (c<= . args) (apply c-op '<= args))
+(define (c>= . args) (apply c-op '>= args))
+(define (c= . args) (apply c-op '= args))
+(define (c+= . args) (apply c-op "+=" args))
+(define (c-= . args) (apply c-op "-=" args))
+(define (c*= . args) (apply c-op '*= args))
+(define (c/= . args) (apply c-op '/= args))
+(define (c%= . args) (apply c-op '%= args))
+(define (c&= . args) (apply c-op '&= args))
+;; (define (|c\|=| . args) (apply c-op '|\|=| args))
+(define (c^= . args) (apply c-op '^= args))
+(define (c<<= . args) (apply c-op '<<= args))
+(define (c>>= . args) (apply c-op '>>= args))
+
+(define (c. . args) (apply c-op "." args))
+(define (c-> . args) (apply c-op "->" args))
+
+(define (c-bit-or . args) (apply c-op "|" args))
+(define (c-or . args) (apply c-op "||" args))
+(define (c-bit-or= . args) (apply c-op "|=" args))
+
+(define (c++/post x)
+  (cat (c-maybe-paren 'post-increment (c-expr x)) "++"))
+(define (c--/post x)
+  (cat (c-maybe-paren 'post-decrement (c-expr x)) "--"))

macros.scm

@@ -1,45 +0,0 @@
-(module macros
-    (register-macro
-     cat
-     get-macro
-     macro?
-     apply-macro
-     defmacro)
-  (import
-    scheme
-    (only fmt fmt)
-    (chicken base)
-    (chicken plist)
-    (chicken string))
-
-  (define (cat-syms s-1 s-2)
-    (fmt #f s-1 s-2))
-
-  (define (cat sym-1 sym-2)
-    (string->symbol (cat-syms sym-1 sym-2)))
-
-  (define (register-macro name arglist body)
-    (put! name 'sex-macro
-          `(lambda ,arglist
-             (import scheme
-                     (only macros cat))
-             ,@body)))
-
-  (define (get-macro name)
-    (eval (get name 'sex-macro)))
-
-  (define (macro? form)
-    (and (list? form)
-         (symbol? (car form))
-         (get (car form) 'sex-macro)))
-
-  (define (apply-macro form)
-    (assert (macro? form)
-            (fmt #f (car form) " is not a macro"))
-    (apply (get-macro (car form))
-           (cdr form)))
-
-  (define (defmacro form)
-    (let ((arglist (car form))
-          (body (cdr form)))
-      (register-macro (car arglist) (cdr arglist) body))))

main.scm

@@ -1,5 +1,6 @@
 ;;; The purpose of this file is to compile it to the only
 ;;; .o that has main entry point.
 
-(import sexc)
+(declare (uses sexc))
+
 (main)

module-system.scm

@@ -1,92 +0,0 @@
-(module module-system
-    (get-modules-public-forms
-     load-persistent-module-paths
-     read-public-interface)
-
-  (import
-    scheme
-    brev-separate
-    (chicken base)
-    (chicken file)
-    (chicken load)
-    (chicken pathname)
-    (chicken process-context)
-    (chicken string)
-    fmt
-    reader
-    srfi-1
-    utils)
-
-  (define +persistent-module-paths+ (list))
-
-  (define (get-modules-public-forms module-list)
-    ;; Module list is a list of symbols
-    ;; How Sex handles modules:
-    ;; For each module in a list, construct path, find module by path in
-    ;; module path directories, extract public definitions from the
-    ;; module, paste them in current one in emulation of C include
-    ;; directives.
-    (fold-right append (list)
-                (map (fn (import-module (symbol->string x)))
-                     module-list)))
-
-  (define (import-module name)
-    (let ((module-path (locate-module name)))
-      (assert module-path (fmt #f "Failed to find module " name " in "
-                               (get-module-paths)))
-      (read-public-interface module-path)))
-
-  (define (get-module-paths)
-    (cons (current-directory)
-          +persistent-module-paths+))
-
-  (define (locate-module name)
-    ;; Module locations: relative to file being compiled, or in what was
-    ;; in SEX_MODULE_PATH env var at the start of the process (see
-    ;; load-persistent-module-paths function)
-
-    (let ((search-paths (get-module-paths)))
-      (let loop ((paths search-paths))
-        (if (null? paths)
-            #f
-            (or (module-exists? name (car paths))
-                (loop (cdr paths)))))))
-
-  (define (module-exists? name module-dir)
-    ;; returns absolute path to module, if it exists
-    (and (directory-exists? module-dir)
-         (let ((module-path (make-absolute-pathname module-dir name "sex")))
-           (and (file-exists? module-path)
-                (file-readable? module-path)
-                module-path))))
-
-  (define (read-public-interface module-path)
-    ;; pub fns are reduced to prototypes, other pub forms are just pasted
-    (let ((raw-forms (read-from-file module-path)))
-      (fold
-       process-public-interface-form
-       (list)
-       raw-forms)))
-
-;;; TODO: use semen facilities to analyze modules
-  (define (process-public-interface-form form acc)
-    (case (car form)
-      ((pub)
-       (case (cadr form)
-         ((fn)                 ; replace with prototype
-          ;; fn type name (arg-list) (body)
-          ;; 1    2   3       4 - we need first 4
-          (cons (take (cdr form) 4) acc))
-         ((define defmacro import include struct typedef union var)
-          (cons (cdr form) acc))
-         (else (error "Pub what? " (cadr form)))))
-      (else acc)))
-
-  (define (load-persistent-module-paths)
-    (let ((sex-module-path-env-var
-           (get-env-var "SEX_MODULE_PATH")))
-      (when sex-module-path-env-var
-        (set! +persistent-module-paths+
-          (map (lambda (p)
-                 (make-absolute-pathname p #f #f))
-               (string-split sex-module-path-env-var ":")))))))

reader.scm

@@ -1,64 +0,0 @@
-(module reader (read-from-file
-                read-raw-forms)
-  (import
-    scheme
-    (chicken base)
-    (chicken io)
-    (chicken pathname)
-    (chicken port)
-    (chicken read-syntax)
-    (chicken string)
-    (chicken syntax)
-    brev-separate
-    fmt)
-
-  (import-syntax utils)
-
-  (define (read-forms acc)
-    (let ((r (read-with-source-info (current-input-port))))
-      (if (eof-object? r) (reverse acc)
-          (read-forms (cons r acc)))))
-
-  (define (read-from-file file)
-    (with-directory file
-                    (with-input-from-file (pathname-strip-directory file)
-                      (fn (read-forms (list))))))
-
-  (define (read-bracket port)
-    (let loop ((c (read-char port))
-               (str (string)))
-      (cond ((char=? c #\])
-             (cons '¤
-                   (with-input-from-string str
-                     (fn (port-map identity read)))))
-            ((char=? c #\[)
-             (loop port (conc )))
-            (else
-             (loop (read-char port)
-                   (conc str c))))))
-
-  (define open-bracket-counter (make-parameter 0))
-
-  (define (read-raw-forms input-source)
-    (let ((bracket-end (gensym)))
-      (set-read-syntax!
-       #\]
-       (lambda (port)
-         (when (= 0 (open-bracket-counter))
-           (error "Unmatched closing bracket"))
-         (open-bracket-counter (- (open-bracket-counter) 1))
-         bracket-end))
-
-      (set-read-syntax!
-       #\[
-       (lambda (port)
-         (open-bracket-counter (+ (open-bracket-counter) 1))
-         (let loop ((r (read port))
-                    (acc (list)))
-           (if (eq? r bracket-end)
-               (cons '¤ (reverse acc))
-               (loop (read port)
-                     (cons r acc)))))))
-    (if (eq? input-source 'stdin)
-        (read-forms (list))
-        (read-from-file input-source))))

semen.scm

@@ -1,22 +1,16 @@
 ;;; Sex semantic engine
 
-(module semen ()
+(declare (unit semen)
-  (import
+         (uses sex-macros
-    scheme
+               sex-modules))
-    (chicken base)
-    (chicken keyword)
-    (chicken string)
-    (chicken module)
-    fmt
-    macros
-    matchable                         ; pattern matching
-    module-system
-    srfi-1                            ; list routines
-    srfi-69                           ; hash tables
-    utils
-    )
 
-  (export/rename (process semen-process))
+(import
+  (chicken string)
+  fmt
+  matchable                             ; pattern matching
+  srfi-1                                ; list routines
+  srfi-69                               ; hash tables
+  )
 
 ;;; for lambda extraction, docstring processing, macro expansion,
 ;;; injection of module headers, i.e. all things that rearrange code
@@ -26,216 +20,195 @@
 ;;; append their return to the resulting list. Each handler can return
 ;;; multiple forms, e.g. lambdas collected from a function may result
 ;;; in auxiliary structures and functions.
-  (define (process raw-sex-forms)
+(define (semen-process raw-sex-forms)
-    (process-rec raw-sex-forms (list)))
+  (semen-process-rec raw-sex-forms (list)))
 
-  (define (process-rec forms acc)
+(define (semen-process-rec forms acc)
-    (cond
+  (cond
-     ((null? forms) (reverse acc))
+   ((null? forms) (reverse acc))
-     ((macro? (car forms))
+   ((sex-macro? (car forms))
-      (process-rec
+    (semen-process-rec
-       (macroexpand (car forms) (cdr forms))
+     (semen-apply-macro (car forms) (cdr forms))
-       acc))
+     acc))
-     (else
+   (else
-      (process-rec (cdr forms)
+    (semen-process-rec (cdr forms)
-                   (match-sex-form (car forms) acc)))))
+                       (match-sex-form (car forms) acc)))))
 
-  (define (macroexpand macro-form rest-forms)
+(define (semen-apply-macro macro-form rest-forms)
-    ;; We want to replace macro with its expansion. The problem is,
+;; We want to replace macro with its expansion. The problem is,
-    ;; top-level macro can return either a single form, or a list of
+;; top-level macro can return either a single form, or a list of
-    ;; forms, when it for example generates some aux
+;; forms, when it for example generates some aux
-    ;; structures/functions/typedefs.
+;; structures/functions/typedefs.
-    ;;
+;;
-    ;; Single form we just cons to the top of rest-forms, but multiple
+;; Single form we just cons to the top of rest-forms, but multiple
-    ;; forms have to be appended to the rest-forms.
+;; forms have to be appended to the rest-forms.
-    (let ((res (apply-macro macro-form)))
+  (let ((res (apply-macro macro-form)))
-      (if (list? (car res))
+    (if (list? (car res))
-          (append res rest-forms)
+        (append res rest-forms)
-          (cons res rest-forms))))
+        (cons res rest-forms))))
 
-  (define (match-sex-form sex-form acc)
+(define (match-sex-form sex-form acc)
-    (match sex-form
+  (match sex-form
-      ((or ('fn . _)
+    ((or ('fn . _)
-           ('pub 'fn . _)
+         ('pub 'fn . _)
-           ('extern 'fn . _)) (process-fn sex-form acc))
+         ('extern 'fn . _)) (process-fn sex-form acc))
-      ((or ('struct . _)
+    ((or ('struct . _)
-           ('pub 'struct . _)) (process-struct sex-form acc))
+         ('pub struct . _)) (process-struct sex-form acc))
-      ((or ('union . _)
+    ((or ('union . _)
-           ('pub 'union . _)) (process-struct sex-form acc))
+         ('pub 'union . _)) (process-struct sex-form acc))
-      ((or ('enum . _)
+    ((or ('var . _)
-           ('pub 'enum . _)) (process-struct sex-form acc))
+         ('pub 'var . _)
-      ((or ('var . _)
+         ('extern 'var . _)) (process-global-var sex-form acc))
-           ('pub 'var . _)
+    (('include _) (cons sex-form acc))
-           ('extern 'var . _)) (process-global-var sex-form acc))
-      (('include _) (cons sex-form acc))
-      (('define . _) (cons sex-form acc))
 
-      (('import . modules)
+    (('import . modules)
-       (process-imports (get-modules-public-forms modules) acc))
+     (semen-process-imports (get-public-forms modules) acc))
 
-      ((or ('defmacro . rest)
+    ((or ('defmacro . rest)
-           ('pub 'defmacro . rest)) (defmacro rest) acc)
+         ('pub 'defmacro . rest)) (defmacro rest) acc)
 
-      ((or ('typedef new-type target)
+    (else (assert #f (fmt #f "Unknown top level form " sex-form)))))
-           ('pub 'typedef new-type target))
-       (process-typedef new-type target acc))
 
-      (else (assert #f (fmt #f "Unknown top level form " sex-form)))))
+(define (semen-process-imports module-public-forms acc)
+  ;; Recursively process imports: register public macros, cons all
+  ;; other public things to our acc
+  (if (null? module-public-forms) acc
+      (match (car module-public-forms)
+        (('defmacro . rest)
+         (defmacro rest)
+         (semen-process-imports (cdr module-public-forms) acc))
+        (else
+         (semen-process-imports (cdr module-public-forms)
+                                (cons (car module-public-forms)
+                                      acc))))))
 
-  (define (process-imports module-public-forms acc)
+(define (semen-macro-expand form)
-    ;; Recursively process imports: register public macros, cons all
+  "Walk the form recursively and expand all macros, unitl none is left."
-    ;; other public things to our acc
+  (semen-walk-form
-    (if (null? module-public-forms) acc
+   form
-        (match (car module-public-forms)
+   (lambda (subform env)
-          (('defmacro . rest)
+     (if (sex-macro? subform)
-           (defmacro rest)
+         (apply-macro subform)
-           (process-imports (cdr module-public-forms) acc))
+         subform))
-          (else
+   #f))
-           (process-imports (cdr module-public-forms)
-                            (cons (car module-public-forms)
-                                  acc))))))
 
-  (define (macro-expand form)
+;;; TODO: for greater inspiration, see SBCL's walk.lisp and their
-    "Walk the form recursively and expand all macros, until none is left."
+;;; template system. Maybe it is worth it to implement something
-    (walk-form
+;;; similar here
-     form
+(define (semen-walk-form form walk-fn env)
-     (lambda (subform env)
+  (if (atom? form) form
-       (if (macro? subform)
+      (let ((new-form (walk-fn form env)))
-           (cons walk-embed-result (macroexpand subform (list)))
+        (cond ((not (eq? form new-form))
-           subform))
+               (semen-walk-form new-form walk-fn env))
-     #f))
+              (else (recons
+                     new-form
+                     (semen-walk-form (car new-form) walk-fn env)
+                     (semen-walk-form (cdr new-form) walk-fn env)))))))
 
-;;; walk-form and friends: form walker with various abilities.
+(define (recons old-cons new-car new-cdr)
-;;; By default, replaces walked form with walk-fn result But may
+  (if (and (eq? new-car (car old-cons))
-;;; perform additional operations depending of what the walk function
+           (eq? new-cdr (cdr old-cons)))
-;;; has requested.
+      old-cons
-
+      (cons new-car new-cdr)))
-;;; For inspiration, see SBCL's walk.lisp and their template
-;;; system.
-
-  (define walk-embed-result (gensym)
-    ;; For cases when result is a list which must be embedded in the
-    ;; form, e.g. when it returned from a macro
-    )
-
-  (define (walk-form form walk-fn env)
-    (if (atom? form) form
-        (let ((new-form (walk-fn form env)))
-          (cond ((not (eq? form new-form))
-                 (walk-form new-form walk-fn env))
-                (else
-                 (let ((new-car (walk-form (car new-form) walk-fn env))
-                       (new-cdr (walk-form (cdr new-form) walk-fn env)))
-                   (cond ((and (pair? new-car)
-                               (eq? (car new-car) walk-embed-result))
-                          (append (cdr new-car) new-cdr))
-                         (else
-                          (recons new-form new-car new-cdr)))))))))
-
-;;; Typdef
-
-  (define (process-typedef new-type target acc)
-    (cons `(typedef ,target ,new-type) acc))
 
 ;;; Fn processing
 
-  (define (process-fn sex-fn acc)
+(define (process-fn sex-fn acc)
-    (let* ((expanded (macro-expand sex-fn))
+  (let* ((expanded (semen-macro-expand sex-fn))
-           (env (make-hash-table))
+         (env (make-hash-table))
-           (processed
+         (processed
-            (walk-form
+          (semen-walk-form
-             expanded
+           expanded
-             fn-walker
+           semen-fn-walker
-             (begin
+           (begin
-               (set! (hash-table-ref env :fn-name) (sex-fn-name expanded))
+             (set! (hash-table-ref env :fn-name) (sex-fn-name expanded))
-               (set! (hash-table-ref env :lambda-counter) 0)
+             (set! (hash-table-ref env :lambda-counter) 0)
-               (set! (hash-table-ref env :lambda-aux-code) (list))
+             (set! (hash-table-ref env :lambda-aux-code) (list))
-               env))))
+             env))))
 
-      (cons processed
+    (cons processed
-            (append (hash-table-ref env :lambda-aux-code) acc))))
+          (append (hash-table-ref env :lambda-aux-code) acc))))
 
-  (define (fn-walker form env)
+(define (semen-fn-walker form env)
-    (if (eq? 'lambda (car form))
+  (if (eq? 'lambda (car form))
-        (let ((lambda-name (make-lambda-name (hash-table-ref env :fn-name)
+      (let ((lambda-name (semen-make-lambda-name (hash-table-ref env :fn-name)
-                                             (hash-table-ref env :lambda-counter))))
+                                                 (hash-table-ref env :lambda-counter))))
-          (set! (hash-table-ref env :lambda-aux-code)
+        (set! (hash-table-ref env :lambda-aux-code)
-            (append (make-aux-lambda-struct lambda-name form)
+          (append (semen-make-aux-lambda-struct lambda-name form)
-                    (hash-table-ref env :lambda-aux-code)))
+                  (hash-table-ref env :lambda-aux-code)))
-          (set! (hash-table-ref env :lambda-counter)
+        (set! (hash-table-ref env :lambda-counter)
-            (+ (hash-table-ref env :lambda-counter) 1))
+          (+ (hash-table-ref env :lambda-counter) 1))
-          lambda-name)
+        lambda-name)
-        form))
+    form))
 
-  (define (make-lambda-name enclosing-fn-name counter)
+(define (semen-make-lambda-name enclosing-fn-name counter)
-    (string->symbol
+  (string->symbol
-     (fmt #f "__lambda_" counter "_" enclosing-fn-name)))
+   (fmt #f "__lambda_" counter "_" enclosing-fn-name)))
 
-  (define (make-aux-lambda-struct name form)
+(define (semen-make-aux-lambda-struct name form)
-    (match form
+  (match form
-      (('lambda ret-type arglist captures . body)
+    (('lambda ret-type arglist captures . body)
-       ;; Captures are ignored for now, but
+     ;; Captures are ignored for now, but
-       ;; we'll need them for TODO: closures support
+     ;; we'll need them for TODO: closures support
-       (process-fn `(fn ,ret-type ,name ,arglist ,@body) (list)))
+     (process-fn `(fn ,ret-type ,name ,arglist ,@body) (list)))
-      (else (assert #f (fmt #f "Malformed lambda " form)))))
+    (else (assert #f (fmt #f "Malformed lambda " form)))))
 
-;;; Structs
+;;; Struct
 
-  (define (process-struct sex-struct acc)
+(define (process-struct sex-struct acc)
-    (cons sex-struct acc))
+  (cons sex-struct acc))
 
-  (define (process-global-var sex-var acc)
+(define (process-global-var sex-var acc)
-    (cons sex-var acc))
+  (cons sex-var acc))
 
 ;;; Utils
-  (define (non-empty-list? form)
+(define (non-empty-list? form)
-    (and (list? form)
+  (and (list? form)
-         (not (null? form))))
+       (not (null? form))))
 
-  (define (sex-fn? form)
+(define (sex-fn? form)
-    "The `form` must be toplevel.
+  "The `form` must be toplevel.
 Returns #f if the form is not a function, returns the form otherwise"
-    (match form
+  (match form
-      ((fn . _) form)
+    ((fn . _) form)
-      ((pub fn . _) form)
+    ((pub fn . _) form)
-      (else #f)))
+    (else #f)))
 
-  (define (sex-fn-public? fn-form)
+(define (sex-fn-public? fn-form)
-    (eq? (car fn-form) 'pub))
+  (eq? (car fn-form) 'pub))
 
-  (define (sex-fn-return-type fn-form)
+(define (sex-fn-return-type fn-form)
-    (assert (sex-fn? fn-form)
+  (assert (sex-fn? fn-form)
-            (fmt #f "Form " fn-form " is not a function"))
+          (fmt #f "Form " fn-form " is not a function"))
-    (if (sex-fn-public? fn-form)
+  (if (sex-fn-public? fn-form)
-        (third fn-form)
+      (third fn-form)
-        (second fn-form)))
+      (second fn-form)))
 
-  (define (sex-fn-name fn-form)
+(define (sex-fn-name fn-form)
-    (assert (sex-fn? fn-form)
+  (assert (sex-fn? fn-form)
-            (fmt #f "Form " fn-form " is not a function"))
+          (fmt #f "Form " fn-form " is not a function"))
-    (if (sex-fn-public? fn-form)
+  (if (sex-fn-public? fn-form)
-        (fourth fn-form)
+      (fourth fn-form)
-        (third fn-form)))
+      (third fn-form)))
 
-  (define (sex-fn-arglist fn-form)
+(define (sex-fn-arglist fn-form)
-    (assert (sex-fn? fn-form)
+  (assert (sex-fn? fn-form)
-            (fmt #f "Form " fn-form " is not a function"))
+          (fmt #f "Form " fn-form " is not a function"))
-    (if (sex-fn-public? fn-form)
+  (if (sex-fn-public? fn-form)
-        (fifth fn-form)
+      (fifth fn-form)
-        (fourth fn-form)))
+      (fourth fn-form)))
 
-  (define (sex-fn-prototype fn-form)
+(define (sex-fn-prototype fn-form)
-    "Returns all except body"
+  "Returns all except body"
-    (assert (sex-fn? fn-form)
+  (assert (sex-fn? fn-form)
-            (fmt #f "Form " fn-form " is not a function"))
+          (fmt #f "Form " fn-form " is not a function"))
-    (if (sex-fn-public? fn-form)
+  (if (sex-fn-public? fn-form)
-        (take fn-form 5)
+      (take fn-form 5)
-        (take fn-form 4)))
+      (take fn-form 4)))
 
-  (define (sex-fn-body fn-form)
+(define (sex-fn-body fn-form)
-    (assert (sex-fn? fn-form)
+  (assert (sex-fn? fn-form)
-            (fmt #f "Form " fn-form " is not a function"))
+          (fmt #f "Form " fn-form " is not a function"))
-    (if (sex-fn-public? fn-form)
+  (if (sex-fn-public? fn-form)
-        (drop fn-form 5)
+      (drop fn-form 5)
-        (drop fn-form 4)))
+      (drop fn-form 4)))
-  )

sex-fmt-c.scm

@@ -1,985 +0,0 @@
-;;;; fmt-c.scm -- fmt module for emitting/pretty-printing C code
-;;
-;; Copyright (c) 2007 Alex Shinn.  All rights reserved.
-;; BSD-style license: http://synthcode.com/license.txt
-
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-;; additional state information
-
-(module sex-fmt-c
-    (
-     fmt-in-macro? fmt-expression? fmt-return?
-     fmt-newline-before-brace? fmt-braceless-bodies?
-     fmt-indent-space fmt-switch-indent-space fmt-op fmt-gen
-     c-in-expr c-in-stmt c-in-test
-     c-paren c-maybe-paren c-type c-literal? c-literal char->c-char
-     c-struct c-union c-class c-enum c-typedef c-cast
-     c-expr c-expr/sexp c-apply c-op c-indent c-current-indent-string
-     c-wrap-stmt c-open-brace c-close-brace
-     c-block c-braced-block c-begin
-     c-fun c-var c-prototype c-param c-param-list
-     c-while c-for c-if c-switch
-     c-case c-case/fallthrough c-default
-     c-break c-continue c-return c-goto c-label
-     c-static c-const c-extern c-volatile c-auto c-restrict c-inline
-     c++ c-- c+ c- c* c/ c% c& c^ c~ c! c&& c<< c>> c== c!= ;  |c\||  |c\|\||
-     c< c> c<= c>= c= c+= c-= c*= c/= c%= c&= c^= c<<= c>>= ;++c --c ;  |c\|=|
-     c++/post c--/post c. c->
-     c-bit-or c-or c-bit-or=
-     cpp-if cpp-ifdef cpp-ifndef cpp-elif cpp-endif cpp-else cpp-undef
-     cpp-include cpp-define cpp-wrap-header cpp-pragma cpp-line
-     cpp-error cpp-warning cpp-stringify cpp-sym-cat
-     c-comment c-block-comment c-attribute)
-
-  (import
-    scheme
-    (chicken base)
-    fmt
-    srfi-1
-    srfi-13)
-
-  (define (fmt-in-macro? st) (fmt-ref st 'in-macro?))
-  (define (fmt-macro-params st) (fmt-ref st 'macro-params))
-  (define (fmt-expression? st) (fmt-ref st 'expression?))
-  (define (fmt-return? st) (fmt-ref st 'return?))
-  (define (fmt-newline-before-brace? st) (fmt-ref st 'newline-before-brace?))
-  (define (fmt-braceless-bodies? st) (fmt-ref st 'braceless-bodies?))
-  (define (fmt-non-spaced-ops? st) (fmt-ref st 'non-spaced-ops?))
-  (define (fmt-no-wrap? st) (fmt-ref st 'no-wrap?))
-  (define (fmt-indent-space st) (fmt-ref st 'indent-space))
-  (define (fmt-switch-indent-space st) (fmt-ref st 'switch-indent-space))
-  (define (fmt-op st) (fmt-ref st 'op 'stmt))
-  (define (fmt-gen st) (fmt-ref st 'gen))
-
-  (define (c-in-expr proc) (fmt-let 'expression? #t proc))
-  (define (c-in-stmt proc) (fmt-let 'expression? #f proc))
-  (define (c-reset-newline proc) (fmt-let 'newline-before-brace? #f proc))
-
-  (define (c-in-test proc) (fmt-let 'in-cond? #t (c-in-expr proc)))
-  (define (c-with-op op proc) (fmt-let 'op op proc))
-
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-  ;; be smart about operator precedence
-
-  (define (c-op-precedence x)
-    (if (string? x)
-        (cond
-         ((or (string=? x ".") (string=? x "->")) 10)
-         ((or (string=? x "++") (string=? x "--")) 20)
-         ((string=? x "&") 55)
-         ((string=? x "|") 65)
-         ((string=? x "&&") 70)
-         ((string=? x "||") 75)
-         ((string=? x "|=") 85)
-         ((or (string=? x "+=") (string=? x "-=")) 85)
-         (else 95))
-        (case x
-          ;;((|::|) 5) ; C++
-          ((dot arrow post-decrement post-increment) 10)
-          ((**) 15)                                            ; Perl
-          ((unary+ unary- ! ~ cast unary-* unary-& sizeof) 20) ; ++ --
-          ((=~ !~) 25)                                         ; Perl
-          ((* / %) 30)
-          ((+ -) 35)
-          ((<< >>) 40)
-          ((< > <= >=) 45)
-          ((lt gt le ge) 45)            ; Perl
-          ((== !=) 50)
-          ((eq ne cmp) 50)              ; Perl
-          ((&) 55)
-          ((^) 60)
-          ;;((|\||) 65)
-          ((&& %and) 70)
-          ((%or) 75)
-          ;;((|\|\||) 75)
-          ;;((.. ...) 77)                   ; Perl
-          ((?) 80)
-          ((= *= /= %= &= ^= <<= >>=) 85) ; |\|=| ;  += -=
-          ((comma) 90)
-          ((=>) 90)                     ; Perl
-          ((not) 92)                    ; Perl
-          ((and) 93)                    ; Perl
-          ((or xor) 94)                 ; Perl
-          ((paren bracket) 100)
-          (else 95))))
-
-  (define (c-op< x y) (< (c-op-precedence x) (c-op-precedence y)))
-  (define (c-op<= x y) (<= (c-op-precedence x) (c-op-precedence y)))
-
-  (define (c-paren x) (cat "(" (c-expr x) ")"))
-
-  (define (c-maybe-paren op x)
-    (lambda (st)
-      ((fmt-let 'op op
-                (if (and (c-op<= (fmt-op st) op)
-                         (not (vector? st)))
-                    (c-paren x)
-                    x))
-       st)))
-
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-  ;; default literals writer
-
-  (define (c-control-operator? x)
-    (memq x '(if while switch repeat do for fun begin)))
-
-  (define (c-literal? x)
-    (or (number? x) (string? x) (char? x) (boolean? x)))
-
-  (define (char->c-char c)
-    (string-append "'" (c-escape-char c #\') "'"))
-
-  (define (c-escape-char c quote-char)
-    (let ((n (char->integer c)))
-      (if (<= 32 n 126)
-          (if (or (eqv? c quote-char) (eqv? c #\\))
-              (string #\\ c)
-              (string c))
-          (case n
-            ((7) "\\a") ((8) "\\b") ((9) "\\t") ((10) "\\n")
-            ((11) "\\v") ((12) "\\f") ((13) "\\r")
-            (else (string-append "\\x" (number->string (char->integer c) 16)))))))
-
-  (define (c-format-number x)
-    (if (and (integer? x) (exact? x))
-        (lambda (st)
-          ((case (fmt-radix st)
-             ((16) (cat "0x" (string-upcase (number->string x 16))))
-             ((8) (cat "0" (number->string x 8)))
-             (else (dsp (number->string x))))
-           st))
-        (dsp (number->string x))))
-
-  (define (c-format-string x)
-    (lambda (st) ((cat #\" (apply-cat (c-string-escaped x)) #\") st)))
-
-  (define (c-string-escaped x)
-    (let loop ((parts '()) (idx (string-length x)))
-      (cond ((string-index-right x c-needs-string-escape? 0 idx)
-             => (lambda (special-idx)
-                  (loop (cons (c-escape-char (string-ref x special-idx) #\")
-                              (cons (substring/shared x (+ special-idx 1) idx)
-                                    parts))
-                        special-idx)))
-            (else
-             (cons (substring/shared x 0 idx) parts)))))
-
-  (define (c-needs-string-escape? c)
-    (if (<= 32 (char->integer c) 127) (memv c '(#\" #\\)) #t))
-
-  (define (c-simple-literal x)
-    (c-wrap-stmt
-     (cond ((char? x) (dsp (char->c-char x)))
-           ((boolean? x) (dsp (if x "1" "0")))
-           ((number? x) (c-format-number x))
-           ((string? x) (c-format-string x))
-           ((null? x) (dsp "NULL"))
-           ((eof-object? x) (dsp "EOF"))
-           (else (dsp (write-to-string x))))))
-
-  (define (c-literal x)
-    (lambda (st)
-      ((if (and (symbol? x) (memq x (or (fmt-macro-params st) '())))
-           (c-paren (c-simple-literal x))
-           (c-simple-literal x))
-       st)))
-
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-  ;; default expression generator
-
-  (define (c-expr/sexp x)
-    (if (procedure? x)
-        x
-        (lambda (st)
-          (cond
-           ((pair? x)
-            (case (car x)
-              ((if) ((apply c-if (cdr x)) st))
-              ((for) ((apply c-for (cdr x)) st))
-              ((while) ((apply c-while (cdr x)) st))
-              ((switch) ((apply c-switch (cdr x)) st))
-              ((case) ((apply c-case (cdr x)) st))
-              ((case/fallthrough) ((apply c-case/fallthrough (cdr x)) st))
-              ((default) ((apply c-default (cdr x)) st))
-              ((break) (c-break st))
-              ((continue) (c-continue st))
-              ((return) ((apply c-return (cdr x)) st))
-              ((goto) ((apply c-goto (cdr x)) st))
-              ((typedef) ((apply c-typedef (cdr x)) st))
-              ((struct union class) ((apply c-struct/aux x) st))
-              ((enum) ((apply c-enum (cdr x)) st))
-              ((inline auto restrict register volatile extern static)
-               ((cat (car x) " " (apply c-begin (cdr x))) st))
-              ;; non C-keywords must have some character invalid in a C
-              ;; identifier to avoid conflicts - by default we prefix %
-              ((vector-ref)
-               ((c-wrap-stmt
-                 (cat (c-expr (cadr x)) "[" (c-expr (caddr x)) "]"))
-                st))
-              ((vector-set!)
-               ((c= (c-in-expr
-                     (cat (c-expr (cadr x)) "[" (c-expr (caddr x)) "]"))
-                    (c-expr (cadddr x)))
-                st))
-              ((extern/C) ((apply c-extern/C (cdr x)) st))
-              ((%apply) ((apply c-apply (cdr x)) st))
-              ((%define) ((apply cpp-define (cdr x)) st))
-              ((%include) ((apply cpp-include (cdr x)) st))
-              ((%fun) ((apply c-fun (cdr x)) st))
-              ((%cond)
-               (let lp ((ls (cdr x)) (res '()))
-                 (if (null? ls)
-                     ((apply c-if (reverse res)) st)
-                     (lp (cdr ls)
-                         (cons (if (pair? (cddar ls))
-                                   (apply c-begin (cdar ls))
-                                   (cadar ls))
-                               (cons (caar ls) res))))))
-              ((%prototype) ((apply c-prototype (cdr x)) st))
-              ((%var) ((apply c-var (cdr x)) st))
-              ((%begin) ((apply c-begin (cdr x)) st))
-              ((%attribute) ((apply c-attribute (cdr x)) st))
-              ((%line) ((apply cpp-line (cdr x)) st))
-              ((%pragma %error %warning)
-               ((apply cpp-generic (substring/shared (symbol->string (car x)) 1)
-                       (cdr x)) st))
-              ((%if %ifdef %ifndef %elif)
-               ((apply cpp-if/aux (substring/shared (symbol->string (car x)) 1)
-                       (cdr x)) st))
-              ((%endif) ((apply cpp-endif (cdr x)) st))
-              ((%block-begin) ((apply c-braced-block #f (cdr x)) st))
-              ((%block) ((apply c-braced-block (cdr x)) st))
-              ((%comment) ((apply c-comment (cdr x)) st))
-              ((:) ((apply c-label (cdr x)) st))
-              ((%cast) ((apply c-cast (cdr x)) st))
-              ((+ - & * / % ! ~ ^ && < > <= >= == != << >>
-                  = *= /= %= &= ^= >>= <<=) ; |\|| |\|\|| |\|=|
-               ((apply c-op x) st))
-              ((bitwise-and bit-and) ((apply c-op '& (cdr x)) st))
-              ((bitwise-ior bit-or) ((apply c-op "|" (cdr x)) st))
-              ((bitwise-xor bit-xor) ((apply c-op '^ (cdr x)) st))
-              ((bitwise-not bit-not) ((apply c-op '~ (cdr x)) st))
-              ((arithmetic-shift) ((apply c-op '<< (cdr x)) st))
-              ((bitwise-ior= bit-or=) ((apply c-op "|=" (cdr x)) st))
-              ((%and) ((apply c-op "&&" (cdr x)) st))
-              ((%or) ((apply c-op "||" (cdr x)) st))
-              ((%. %field) ((apply c-op "." (cdr x)) st))
-              ((%->) ((apply c-op "->" (cdr x)) st))
-              (else
-               (cond
-                ((eq? (car x) (string->symbol "."))
-                 ((apply c-op "." (cdr x)) st))
-                ((eq? (car x) (string->symbol "->"))
-                 ((apply c-op "->" (cdr x)) st))
-                ((eq? (car x) (string->symbol "++"))
-                 ((apply c-op "++" (cdr x)) st))
-                ((eq? (car x) (string->symbol "--"))
-                 ((apply c-op "--" (cdr x)) st))
-                ((eq? (car x) (string->symbol "+="))
-                 ((apply c-op "+=" (cdr x)) st))
-                ((eq? (car x) (string->symbol "-="))
-                 ((apply c-op "-=" (cdr x)) st))
-                (else ((c-apply x) st))))))
-           ((vector? x)
-            ((c-wrap-stmt
-              (fmt-try-fit
-               (fmt-let 'no-wrap? #t
-                        (cat "{" (fmt-join c-expr (vector->list x) ", ") "}"))
-               (lambda (st)
-                 (let* ((col (fmt-col st))
-                        (sep (string-append "," (make-nl-space col))))
-                   ((cat "{" (fmt-join c-expr (vector->list x) sep)
-                         "}" nl)
-                    st)))))
-             st))
-           (else
-            ((c-literal x) st))))))
-
-  (define (c-apply ls)
-    (c-wrap-stmt
-     (c-with-op
-      'paren
-      (cat (c-expr (car ls))
-           (let ((flat (fmt-let 'no-wrap? #t (fmt-join c-expr (cdr ls) ", "))))
-             (fmt-if
-              fmt-no-wrap?
-              (c-paren flat)
-              (c-paren
-               (fmt-try-fit
-                flat
-                (lambda (st)
-                  (let* ((col (fmt-col st))
-                         (sep (string-append "," (make-nl-space col))))
-                    ((fmt-join c-expr (cdr ls) sep) st)))))))))))
-
-  (define (c-expr x)
-    (lambda (st) (((or (fmt-gen st) c-expr/sexp) x) st)))
-
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-  ;; comments, with Emacs-friendly escaping of nested comments
-
-  (define (make-comment-writer st)
-    (let ((output (fmt-ref st 'writer)))
-      (lambda (str st)
-        (let ((lim (- (string-length str) 1)))
-          (let lp ((i 0) (st st))
-            (let ((j (string-index str #\/ i)))
-              (if j
-                  (let ((st (if (and (> j 0)
-                                     (eqv? #\* (string-ref str (- j 1))))
-                                (output
-                                 "\\/"
-                                 (output (substring/shared str i j) st))
-                                (output (substring/shared str i (+ j 1)) st))))
-                    (lp (+ j 1)
-                        (if (and (< j lim) (eqv? #\* (string-ref str (+ j 1))))
-                            (output "\\" st)
-                            st)))
-                  (output (substring/shared str i) st))))))))
-
-  (define (c-comment . args)
-    (lambda (st)
-      ((cat "/*" (fmt-let 'writer (make-comment-writer st)
-                          (apply-cat args))
-            "*/")
-       st)))
-
-  (define (make-block-comment-writer st)
-    (let ((output (make-comment-writer st))
-          (indent (string-append (make-nl-space (+ (fmt-col st) 1)) "* ")))
-      (lambda (str st)
-        (let ((lim (string-length str)))
-          (let lp ((i 0) (st st))
-            (let ((j (string-index str #\newline i)))
-              (if j
-                  (lp (+ j 1)
-                      (output indent (output (substring/shared str i j) st)))
-                  (output (substring/shared str i) st))))))))
-
-  (define (c-block-comment . args)
-    (lambda (st)
-      (let ((col (fmt-col st))
-            (row (fmt-row st))
-            (indent (c-current-indent-string st)))
-        ((cat "/* "
-              (fmt-let 'writer (make-block-comment-writer st) (apply-cat args))
-              (lambda (st)
-                (cond
-                 ((= row (fmt-row st)) ((dsp " */") st))
-                 ;;((= (+ 3 col) (fmt-col st)) ((dsp "*/") st))
-                 (else ((cat fl indent " */") st)))))
-         st))))
-
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-  ;; preprocessor
-
-  (define (make-cpp-writer st)
-    (let ((output (fmt-ref st 'writer)))
-      (lambda (str st)
-        (let lp ((i 0) (st st))
-          (let ((j (string-index str #\newline i)))
-            (if j
-                (lp (+ j 1)
-                    (output
-                     nl-str
-                     (output " \\" (output (substring/shared str i j) st))))
-                (output (substring/shared str i) st)))))))
-
-  (define (cpp-include file)
-    (if (string? file)
-        (cat fl "#include " (wrt file) fl)
-        (cat fl "#include <" file ">" fl)))
-
-  (define (list-dot x)
-    (cond ((pair? x) (list-dot (cdr x)))
-          ((null? x) #f)
-          (else x)))
-
-  (define (flatten-list ls)
-    (let lp ((ls ls) (res '()))
-      (cond ((pair? ls) (lp (cdr ls) (cons (car ls) res)))
-            ((null? ls) (reverse res))
-            (else (reverse (cons ls res))))))
-
-  (define (replace-tree from to x)
-    (let replace ((x x))
-      (cond ((eq? x from) to)
-            ((pair? x) (cons (replace (car x)) (replace (cdr x))))
-            (else x))))
-
-  (define (cpp-define x . body)
-    (define (name-of x) (c-expr (if (pair? x) (cadr x) x)))
-    (lambda (st)
-      (let* ((body (cond
-                    ((and (pair? x) (list-dot x))
-                     => (lambda (dot)
-                          (if (eq? dot '...)
-                              body
-                              (replace-tree dot '__VA_ARGS__ body))))
-                    (else body)))
-             (params (map (lambda (x) (if (pair? x) (cadr x) x))
-                          (flatten-list (if (pair? x) (cdr x) '()))))
-             (tail
-              (if (pair? body)
-                  (cat " "
-                       (fmt-let 'writer (make-cpp-writer st)
-                                (fmt-let 'macro-params params
-                                         ((if (or (not (pair? x))
-                                                  (and (null? (cdr body))
-                                                       (c-literal? (car body))))
-                                              (lambda (x) x)
-                                              c-paren)
-                                          (c-in-expr (apply c-begin body))))))
-                  (lambda (x) x))))
-        ((c-in-expr
-          (if (pair? x)
-              (cat fl "#define " (name-of (car x))
-                   (c-paren
-                    (fmt-join/dot name-of
-                                  (lambda (dot) (dsp "..."))
-                                  (cdr x)
-                                  ", "))
-                   tail fl)
-              (cat fl "#define " (c-expr x) tail fl)))
-         st))))
-
-  (define (cpp-expr x)
-    (if (or (symbol? x) (string? x)) (dsp x) (c-expr x)))
-
-  (define (cpp-if/aux name check . o)
-    (let* ((pass (and (pair? o) (car o)))
-           (comment (if (member name '("ifdef" "ifndef"))
-                        (cat "  "
-                             (c-comment
-                              " " (if (equal? name "ifndef") "! " "")
-                              check " "))
-                        ""))
-           (endif (if pass (cat fl "#endif" comment) ""))
-           (tail (cond
-                  ((and (pair? o) (pair? (cdr o)))
-                   (if (pair? (cddr o))
-                       (apply cpp-elif (cdr o))
-                       (cat (cpp-else) (cadr o) endif)))
-                  (else endif))))
-      (lambda (st)
-        (let ((indent (c-current-indent-string st)))
-          ((cat fl "#" name " " (cpp-expr check) fl
-                (if pass (cat indent pass) "") fl
-                tail fl)
-           st)))))
-
-  (define (cpp-if check . o)
-    (apply cpp-if/aux "if" check o))
-  (define (cpp-ifdef check . o)
-    (apply cpp-if/aux "ifdef" check o))
-  (define (cpp-ifndef check . o)
-    (apply cpp-if/aux "ifndef" check o))
-  (define (cpp-elif check . o)
-    (apply cpp-if/aux "elif" check o))
-  (define (cpp-else . o)
-    (cat fl "#else " (if (pair? o) (c-comment (car o)) "") fl))
-  (define (cpp-endif . o)
-    (cat fl "#endif " (if (pair? o) (c-comment (car o)) "") fl))
-
-  (define (cpp-wrap-header name . body)
-    (let ((name name))                  ; consider auto-mangling
-      (cpp-ifndef name (c-begin (cpp-define name) nl (apply c-begin body) nl))))
-
-  (define (cpp-line num . o)
-    (cat fl "#line " num (if (pair? o) (cat " " (car o)) "") fl))
-
-  (define (cpp-generic name . ls)
-    (cat fl "#" name (apply-cat ls) fl))
-
-  (define (cpp-undef . args) (apply cpp-generic "undef" args))
-  (define (cpp-pragma . args) (apply cpp-generic "pragma" args))
-  (define (cpp-error . args) (apply cpp-generic "error" args))
-  (define (cpp-warning . args) (apply cpp-generic "warning" args))
-
-  (define (cpp-stringify x)
-    (cat "#" x))
-
-  (define (cpp-sym-cat . args)
-    (fmt-join dsp args " ## "))
-
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-  ;; general indentation and brace rules
-
-  (define (c-current-indent-string st . o)
-    (make-space (max 0 (+ (fmt-col st) (if (pair? o) (car o) 0)))))
-
-  (define (c-indent st . o)
-    (dsp (make-space (max 0 (+ (fmt-col st) (or (fmt-indent-space st) 4)
-                               (if (pair? o) (car o) 0))))))
-
-  (define (c-indent/switch st)
-    (dsp (make-space (+ (fmt-col st) (or (fmt-switch-indent-space st) 4)))))
-
-  (define (c-open-brace st)
-    (if (fmt-newline-before-brace? st)
-        (begin
-          (fmt-set! st 'newline-before-brace? #t)
-          (cat "{" nl))
-        (begin
-          (fmt-set! st 'newline-before-brace? #t)
-          (cat " {" nl))))
-
-  (define (c-close-brace st)
-    (dsp "}"))
-
-  (define (c-wrap-stmt x)
-    (fmt-if fmt-expression?
-            (c-expr x)
-            (cat (c-in-expr (c-expr x)) ";" nl)))
-
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-  ;; code blocks
-
-  (define (c-block . args)
-    (apply c-block/aux 0 args))
-
-  (define (c-block/aux offset header body0 . body)
-    (let ((inner (apply c-begin body0 body)))
-      (if (or (pair? body)
-              (not (or (c-literal? body0)
-                       (and (pair? body0)
-                            (not (c-control-operator? (car body0)))))))
-          (c-braced-block/aux offset header inner)
-          (lambda (st)
-            (if (fmt-braceless-bodies? st)
-                ((cat header fl (c-indent st offset) inner fl) st)
-                ((c-braced-block/aux offset header inner) st))))))
-
-  (define (c-braced-block . args)
-    (apply c-braced-block/aux 0 args))
-
-  (define (c-braced-block/aux offset header . body)
-    (lambda (st)
-      ((cat (if header header "") (c-open-brace st) (c-indent st offset)
-            (apply c-begin body) fl
-            (c-current-indent-string st offset) (c-close-brace st))
-       st)))
-
-  (define (c-begin . args)
-    (apply c-begin/aux #f args))
-
-  (define (c-begin/aux ret? body0 . body)
-    (if (null? body)
-        (c-expr body0)
-        (lambda (st)
-          (if (fmt-expression? st)
-              ((fmt-try-fit
-                (fmt-let 'no-wrap? #t (fmt-join c-expr (cons body0 body) ", "))
-                (lambda (st)
-                  (let ((indent (c-current-indent-string st)))
-                    ((fmt-join c-expr (cons body0 body) (cat "," nl indent)) st))))
-               st)
-              (let ((orig-ret? (fmt-return? st)))
-                ((fmt-join/last c-expr
-                                (lambda (x) (fmt-let 'return? orig-ret? (c-expr x)))
-                                (cons body0 body)
-                                (cat fl (c-current-indent-string st)))
-                 (fmt-set! st 'return? (and ret? orig-ret?))))))))
-
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-  ;; data structures
-
-  (define (c-struct/aux type x . o)
-    ;; can be just pointer to SUC, need to support such case:
-    ;; struct whatever * - body is just '*'
-    (let* ((name (if (null? o) (if (or (symbol? x) (string? x)) x #f) x))
-           (body (if name (if (not (null? o)) (car o) '()) x))
-           (o (if (null? o) o (cdr o))))
-      (if (and (not (null? body))
-               (not (eq? '* body)))
-          (c-wrap-stmt
-           (cat
-            (c-braced-block
-             (cat type (if (and name (not (equal? name ""))) (cat " " name) ""))
-             (cat
-              (c-in-stmt
-               (if (list? body)
-                   (apply c-begin (map c-wrap-stmt (map c-field body)))
-                   (c-wrap-stmt (c-expr body))))))
-            (if (pair? o) (cat " " (apply c-begin o)) (dsp ""))))
-          (c-wrap-stmt
-           (cat type
-                (if (and name (not (equal? name "")))
-                    (cat " " name)
-                    "")
-                (if (not (null? body))
-                    (cat body)
-                    ""))))))
-
-  (define (c-struct . args) (apply c-struct/aux "struct" args))
-  (define (c-union . args) (apply c-struct/aux "union" args))
-  (define (c-class . args) (apply c-struct/aux "class" args))
-
-  (define (c-enum x . o)
-    (define (c-enum-one x)
-      (if (pair? x) (cat (car x) " = " (c-expr (cadr x))) (dsp x)))
-    (let* ((name (if (null? o) (if (or (symbol? x) (string? x)) x #f) x))
-           (vals (if name (car o) x)))
-      (c-wrap-stmt
-       (cat
-        (c-braced-block
-         (if name (cat "enum " name) (dsp "enum"))
-         (c-in-expr (apply c-begin (map c-enum-one vals))))))))
-
-  (define (c-attribute . args)
-    (cat "__attribute__ ((" (fmt-join c-expr args ", ") "))"))
-
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-  ;; basic control structures
-
-  (define (c-while check . body)
-    (c-reset-newline
-     (if (null? body)
-         (cat "while (" (c-in-test (c-expr check)) ");")
-         (cat (c-block (cat "while (" (c-in-test (c-expr check)) ")")
-                       (c-in-stmt (apply c-begin body)))
-              fl))))
-
-  (define (c-for init check update . body)
-    (c-reset-newline
-     (cat
-      (c-block
-       (c-in-expr
-        (cat "for (" (c-expr init) "; " (c-in-test (c-expr check)) "; "
-             (c-expr update ) ")"))
-       (c-in-stmt (apply c-begin body)))
-      fl)))
-
-  (define (c-param x)
-    (cond
-     ((procedure? x) x)
-     ((pair? x) (c-param-type (car x) (cadr x)))
-     (else (error "missing type" x))))
-
-  (define (c-field x)
-    (cond
-     ((procedure? x) x)
-     ((pair? x)
-      (if (list? (car x))
-          (case (caar x)
-            ((union struct class)
-             (if (> (length x) 1)
-                 (c-type (car x)
-                         (cadr x))
-                 (c-type (car x))))
-            (else (c-type (car x) (cadr x))))
-          (c-type (car x)
-                  (fmt-join c-expr (cdr x) ", "))))
-     (else (error "missing type" x))))
-
-  (define (c-param-list ls)
-    (if (null? ls)
-        (c-type 'void)
-        (c-in-expr (fmt-join/dot c-param (lambda (dot) (dsp "...")) ls ", "))))
-
-  (define (c-fun type name params . body)
-    (cat (c-block (c-in-expr (c-prototype type name params))
-                  (c-in-stmt (apply c-begin body)))
-         fl))
-
-  (define (c-prototype type name params . o)
-    (c-wrap-stmt
-     (cat (c-type type) " " (c-expr name) " (" (c-param-list params) ")"
-          (fmt-join/prefix c-expr o " "))))
-
-  (define (c-static x) (cat "static " (c-expr x)))
-  (define (c-const x) (cat "const " (c-expr x)))
-  (define (c-restrict x) (cat "restrict " (c-expr x)))
-  (define (c-volatile x) (cat "volatile " (c-expr x)))
-  (define (c-auto x) (cat "auto " (c-expr x)))
-  (define (c-inline x) (cat "inline " (c-expr x)))
-  (define (c-extern x) (cat "extern " (c-expr x)))
-  (define (c-extern/C . body)
-    (cat "extern \"C\" {" nl (apply c-begin body) nl "}" nl))
-
-  (define (c-type type . o)
-    (let ((name (and (pair? o) (car o))))
-      (cond
-       ((pair? type)
-        (case (car type)
-          ((%fun)
-           (cat (c-type (cadr type) #f)
-                " (*" (or name "") ")("
-                (fmt-join (lambda (x) (c-type x #f)) (caddr type) ", ") ")"))
-          ((%array)
-           (let ((name (cat name "[" (if (pair? (cddr type))
-                                         (c-expr (caddr type))
-                                         "")
-                            "]")))
-             (c-type (cadr type) name)))
-          ((%pointer *)
-           (let ((name (cat "*" (if name (c-expr name) ""))))
-             (c-type (cadr type)
-                     (if (and (pair? (cadr type)) (eq? '%array (caadr type)))
-                         (c-paren name)
-                         name))))
-          ((enum) (apply c-enum name (cdr type)))
-          ((struct union class)
-           (cat (apply c-struct/aux (car type) (cdr type)) (if name (cat " " name) "")))
-          (else (fmt-join/last c-expr (lambda (x) (c-type x name)) type " "))))
-       ((not type)
-        (lambda (st) ((c-type 'int name) st)))
-       (else
-        (cat (if (eq? '%pointer type) '* type) (if name (cat " " name) ""))))))
-
-  (define (c-param-type type . o)
-    (let ((name (and (pair? o) (car o))))
-      (cond
-       ((pair? type)
-        (case (car type)
-          ((%fun)
-           (cat (c-type (cadr type) #f)
-                " (*" (or name "") ")("
-                (fmt-join (lambda (x) (c-type x #f)) (caddr type) ", ") ")"))
-          ((%array)
-           (let ((name (cat name "[" (if (pair? (cddr type))
-                                         (c-expr (caddr type))
-                                         "")
-                            "]")))
-             (c-type (cadr type) name)))
-          ((%pointer *)
-           (let ((name (cat "*" (if name (c-expr name) ""))))
-             (c-type (cadr type)
-                     (if (and (pair? (cadr type)) (eq? '%array (caadr type)))
-                         (c-paren name)
-                         name))))
-          (else (fmt-join/last c-expr (lambda (x) (c-type x name)) type " "))))
-       ((not type)
-        (lambda (st) ((c-type 'int name) st)))
-       (else
-        (cat (if (eq? '%pointer type) '* type) (if name (cat " " name) ""))))))
-
-  (define (c-var type name . init)
-    (c-wrap-stmt
-     (if (pair? init)
-         (cat (c-type type name) " = " (c-expr (car init)))
-         (c-type type (if (pair? name)
-                          (fmt-join c-expr name ", ")
-                          (c-expr name))))))
-
-  (define (c-cast type expr)
-    (cat "(" (c-type type) ")" (c-expr expr)))
-
-  (define (c-typedef type alias . o)
-    (c-wrap-stmt
-     (cat "typedef " (c-type type alias) (fmt-join/prefix c-expr o " "))))
-
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-  ;; Generalized IF: allows multiple tail forms for if/else if/.../else
-  ;; blocks.  A final ELSE can be signified with a test of #t or 'else,
-  ;; or by simply using an odd number of expressions (by which the
-  ;; normal 2 or 3 clause IF forms are special cases).
-
-  (define (c-if/stmt c p . rest)
-    (lambda (st)
-      (let ((indent (c-current-indent-string st)))
-        ((let lp ((c c) (p p) (ls rest))
-           (if (or (eq? c 'else) (eq? c #t))
-               (if (not (null? ls))
-                   (error "forms after else clause in IF" c p ls)
-                   (cat (c-block/aux -1 " else" p) fl))
-               (let ((tail (if (pair? ls)
-                               (if (pair? (cdr ls))
-                                   (lp (car ls) (cadr ls) (cddr ls))
-                                   (lp 'else (car ls) '()))
-                               fl)))
-                 (cat (c-block/aux
-                       (if (eq? ls rest) 0 -1)
-                       (cat (if (eq? ls rest) (lambda (x) x) " else ")
-                            "if (" (c-in-test (c-expr c)) ")") p)
-                      tail))))
-         st))))
-
-  (define (c-if/expr c p . rest)
-    (let lp ((c c) (p p) (ls rest))
-      (cond
-       ((or (eq? c 'else) (eq? c #t))
-        (if (not (null? ls))
-            (error "forms after else clause in IF" c p ls)
-            (c-expr p)))
-       ((pair? ls)
-        (cat (c-in-test (c-expr c)) " ? " (c-expr p) " : "
-             (if (pair? (cdr ls))
-                 (lp (car ls) (cadr ls) (cddr ls))
-                 (lp 'else (car ls) '()))))
-       (else
-        (c-or (c-in-test (c-expr c)) (c-expr p))))))
-
-  (define (c-if . args)
-    (fmt-if fmt-expression?
-            (apply c-if/expr args)
-            (apply c-if/stmt args)))
-
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-  ;; switch statements, automatic break handling
-
-  (define (c-label name)
-    (lambda (st)
-      (let ((indent (make-space (max 0 (- (fmt-col st) 2)))))
-        ((cat fl indent name ":" fl) st))))
-
-  (define c-break
-    (c-wrap-stmt (dsp "break")))
-  (define c-continue
-    (c-wrap-stmt (dsp "continue")))
-  (define (c-return . result)
-    (if (pair? result)
-        (c-wrap-stmt (cat "return " (c-expr (car result))))
-        (c-wrap-stmt (dsp "return"))))
-  (define (c-goto label)
-    (c-wrap-stmt (cat "goto " (c-expr label))))
-
-  (define (c-switch val . clauses)
-    (c-reset-newline
-     (lambda (st)
-       ((cat "switch (" (c-in-expr val) ")" (c-open-brace st)
-             (c-indent/switch st)
-             (c-in-stmt (apply c-begin/aux #t (map c-switch-clause clauses))) fl
-             (c-current-indent-string st) (c-close-brace st) fl)
-        st))))
-
-  (define (c-switch-clause/breaks x)
-    (lambda (st)
-      (let* ((break?
-              (and (car x)
-                   (not (member (cadr x) '(case/fallthrough
-                                           default/fallthrough
-                                           else/fallthrough)))))
-             (explicit-case? (member (cadr x) '(case case/fallthrough)))
-             (indent (c-current-indent-string st))
-             (indent-body (c-indent st))
-             (sep (string-append ":" nl-str indent)))
-        ((cat (c-in-expr
-               (fmt-join/suffix
-                dsp
-                (cond
-                 ((pair? (cadr x))
-                  (map (lambda (y) (cat (dsp "case ") (c-expr y)))
-                       (cadr x)))
-                 (explicit-case?
-                  (map (lambda (y) (cat (dsp "case ") (c-expr y)))
-                       (if (list? (caddr x))
-                           (caddr x)
-                           (list (caddr x)))))
-                 ((member (cadr x)
-                          '(default else default/fallthrough else/fallthrough))
-                  (list (dsp "default")))
-                 (else
-                  (error
-                   "unknown switch clause, expected a list or default but got"
-                   (cadr x))))
-                sep))
-              (make-space (or (fmt-indent-space st) 4))
-              (fmt-join c-expr
-                        (if explicit-case? (cdddr x) (cddr x))
-                        indent-body)
-              (if (and break? (not (fmt-return? st)))
-                  (cat fl indent-body c-break)
-                  ""))
-         st))))
-
-  (define (c-switch-clause x)
-    (if (procedure? x) x (c-switch-clause/breaks (cons #t x))))
-  (define (c-switch-clause/no-break x)
-    (if (procedure? x) x (c-switch-clause/breaks (cons #f x))))
-
-  (define (c-case x . body)
-    (c-switch-clause (cons (if (pair? x) x (list x)) body)))
-  (define (c-case/fallthrough x . body)
-    (c-switch-clause/no-break (cons (if (pair? x) x (list x)) body)))
-  (define (c-default . body)
-    (c-switch-clause/breaks (cons #t (cons 'else body))))
-
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-  ;; operators
-
-  (define (c-op op first . rest)
-    (if (null? rest)
-        (c-unary-op op first)
-        (apply c-binary-op op first rest)))
-
-  (define (c-binary-op op . ls)
-    (define (lit-op? x) (or (c-literal? x) (symbol? x)))
-    (let ((str (display-to-string op)))
-      (c-wrap-stmt
-       (c-maybe-paren
-        op
-        (if (or (equal? str ".") (equal? str "->"))
-            (fmt-join c-expr ls str)
-            (let ((flat
-                   (fmt-let 'no-wrap? #t
-                            (lambda (st)
-                              ((fmt-join c-expr
-                                         ls
-                                         (if (and (fmt-non-spaced-ops? st)
-                                                  (every lit-op? ls))
-                                             str
-                                             (string-append " " str " ")))
-                               st)))))
-              (fmt-if
-               fmt-no-wrap?
-               flat
-               (fmt-try-fit
-                flat
-                (lambda (st)
-                  ((fmt-join c-expr
-                             ls
-                             (cat nl (make-space (+ 2 (fmt-col st))) str " "))
-                   st))))))))))
-
-  (define (c-unary-op op x)
-    (c-wrap-stmt
-     (cat (display-to-string op) (c-maybe-paren op (c-expr x)))))
-
-  ;; some convenience definitions
-
-  (define (c++ . args) (apply c-op "++" args))
-  (define (c-- . args) (apply c-op "--" args))
-  (define (c+ . args) (apply c-op '+ args))
-  (define (c- . args) (apply c-op '- args))
-  (define (c* . args) (apply c-op '* args))
-  (define (c/ . args) (apply c-op '/ args))
-  (define (c% . args) (apply c-op '% args))
-  (define (c& . args) (apply c-op '& args))
-  ;; (define (|c\|| . args) (apply c-op '|\|| args))
-  (define (c^ . args) (apply c-op '^ args))
-  (define (c~ . args) (apply c-op '~ args))
-  (define (c! . args) (apply c-op '! args))
-  (define (c&& . args) (apply c-op '&& args))
-  ;; (define (|c\|\|| . args) (apply c-op '|\|\|| args))
-  (define (c<< . args) (apply c-op '<< args))
-  (define (c>> . args) (apply c-op '>> args))
-  (define (c== . args) (apply c-op '== args))
-  (define (c!= . args) (apply c-op '!= args))
-  (define (c< . args) (apply c-op '< args))
-  (define (c> . args) (apply c-op '> args))
-  (define (c<= . args) (apply c-op '<= args))
-  (define (c>= . args) (apply c-op '>= args))
-  (define (c= . args) (apply c-op '= args))
-  (define (c+= . args) (apply c-op "+=" args))
-  (define (c-= . args) (apply c-op "-=" args))
-  (define (c*= . args) (apply c-op '*= args))
-  (define (c/= . args) (apply c-op '/= args))
-  (define (c%= . args) (apply c-op '%= args))
-  (define (c&= . args) (apply c-op '&= args))
-  ;; (define (|c\|=| . args) (apply c-op '|\|=| args))
-  (define (c^= . args) (apply c-op '^= args))
-  (define (c<<= . args) (apply c-op '<<= args))
-  (define (c>>= . args) (apply c-op '>>= args))
-
-  (define (c. . args) (apply c-op "." args))
-  (define (c-> . args) (apply c-op "->" args))
-
-  (define (c-bit-or . args) (apply c-op "|" args))
-  (define (c-or . args) (apply c-op "||" args))
-  (define (c-bit-or= . args) (apply c-op "|=" args))
-
-  (define (c++/post x)
-    (cat (c-maybe-paren 'post-increment (c-expr x)) "++"))
-  (define (c--/post x)
-    (cat (c-maybe-paren 'post-decrement (c-expr x)) "--")))

sex-macros.scm

@@ -0,0 +1,36 @@
+(declare (unit sex-macros))
+
+(import
+  (chicken plist)
+  (chicken string))
+
+(define (cat-syms s-1 s-2)
+  (import fmt)
+  (fmt #f s-1 s-2))
+
+(define (cat sym-1 sym-2)
+  (string->symbol (cat-syms sym-1 sym-2)))
+
+(define (register-macro name arglist body)
+  (put! name 'sex-macro
+        `(lambda ,arglist
+           ,@body)))
+
+(define (get-macro name)
+  (eval (get name 'sex-macro)))
+
+(define (sex-macro? form)
+  (and (list? form)
+       (symbol? (car form))
+       (get (car form) 'sex-macro)))
+
+(define (apply-macro form)
+  (assert (sex-macro? form)
+          (fmt #f (car form) " is not a macro"))
+  (apply (get-macro (car form))
+         (cdr form)))
+
+(define (defmacro form)
+  (let ((arglist (car form))
+        (body (cdr form)))
+    (register-macro (car arglist) (cdr arglist) body)))

sex-modules.scm

@@ -0,0 +1,88 @@
+; Why `sex-modules`? Probably `modules` unit is reserved by chicken,
+; things start to break.
+(declare (unit sex-modules)
+         (uses sex-reader
+               utils))
+
+(import brev-separate
+        (chicken file)
+        (chicken load)
+        (chicken pathname)
+        (chicken process-context)
+        (chicken string)
+        fmt
+        srfi-1)
+
+(define +persistent-module-paths+ (list))
+
+(define (get-public-forms module-list)
+  ;; Module list is a list of symbols
+  ;; How Sex handles modules:
+  ;; For each module in a list, construct path, find module by path in
+  ;; module path directories, extract public definitions from the
+  ;; module, paste them in current one in emulation of C include
+  ;; directives.
+  (fold-right append (list)
+              (map (fn (import-module (symbol->string x)))
+                   module-list)))
+
+(define (import-module name)
+  (let ((module-path (locate-module name)))
+    (assert module-path (fmt #f "Failed to find module " name " in "
+                             (get-module-paths)))
+    (read-public-interface module-path)))
+
+(define (get-module-paths)
+  (cons (current-directory)
+        +persistent-module-paths+))
+
+(define (locate-module name)
+  ;; Module locations: relative to file being compiled, or in what was
+  ;; in SEX_MODULE_PATH env var at the start of the process (see
+  ;; load-persistent-module-paths function)
+
+  (let ((search-paths (get-module-paths)))
+    (let loop ((paths search-paths))
+      (if (null? paths)
+          #f
+          (or (module-exists? name (car paths))
+              (loop (cdr paths)))))))
+
+(define (module-exists? name module-dir)
+  ;; returns absolute path to module, if it exists
+  (and (directory-exists? module-dir)
+       (let ((module-path (make-absolute-pathname module-dir name "sex")))
+         (and (file-exists? module-path)
+              (file-readable? module-path)
+              module-path))))
+
+(define (read-public-interface module-path)
+  ;; pub fns are reduced to prototypes, other pub forms are just pasted
+  (let ((raw-forms (read-from-file module-path)))
+    (fold
+     process-public-interface-form
+     (list)
+     raw-forms)))
+
+;;; TODO: use semen facilities to analyze modules
+(define (process-public-interface-form form acc)
+  (case (car form)
+    ((pub)
+     (case (cadr form)
+       ((fn) ; replace with prototype
+        ;; fn type name (arg-list) (body)
+        ;; 1    2   3       4 - we need first 4
+        (cons (take (cdr form) 4) acc))
+       ((define defmacro import include struct typedef union var)
+        (cons (cdr form) acc))
+       (else (error "Pub what? " (cadr form)))))
+    (else acc)))
+
+(define (load-persistent-module-paths)
+  (let ((sex-module-path-env-var
+         (get-env-var "SEX_MODULE_PATH")))
+    (when sex-module-path-env-var
+      (set! +persistent-module-paths+
+        (map (lambda (p)
+               (make-absolute-pathname p #f #f))
+             (string-split sex-module-path-env-var ":"))))))

sex-reader.scm

@@ -0,0 +1,22 @@
+(declare (unit sex-reader))
+
+(include "utils.macros.scm")
+
+(import (chicken pathname)
+        brev-separate
+        fmt)
+
+(define (read-forms acc)
+  (let ((r (read)))
+    (if (eof-object? r) (reverse acc)
+        (read-forms (cons r acc)))))
+
+(define (read-from-file file)
+  (with-directory file
+    (with-input-from-file (pathname-strip-directory file)
+      (fn (read-forms (list))))))
+
+(define (read-raw-forms input-source)
+  (if (eq? input-source 'stdin)
+      (read-forms (list))
+      (read-from-file input-source)))

sexc.scm

@@ -1,167 +1,152 @@
-(module sexc (main)
+(declare (unit sexc)
-  (import scheme
+         (uses fmt-c-writer
-          brev-separate
+               sex-reader
-          (chicken base)
+               semen))
-          (chicken file)
+
-          (chicken plist)
+(include "utils.macros.scm")
-          (chicken pretty-print)
+
-          (chicken process)
+(import brev-separate
-          (chicken process-context)
+        (chicken file)
-          (chicken port)
+        (chicken plist)
-          fmt
+        (chicken pretty-print)
-          fmt-c-writer
+        (chicken process)
-          getopt-long
+        (chicken process-context)
-          macros
+        (chicken port)
-          module-system
+        fmt
-          reader
+        getopt-long
-          semen
+        srfi-1                          ; list routines
-          srfi-1                          ; list routines
+        srfi-13
-          srfi-13
+        tree)
-          tree
-          utils)
 
 ;;; Main function facilities
 
-  (define opts-grammar
+(define opts-grammar
-    (let ((padding 26))
+  (let ((padding 26))
-      `((c-compiler ,(fmt #f "Select C compiler. Defaults to value of SEX_CC" nl
+    `((c-compiler ,(fmt #f "Select C compiler. Defaults to value of SEX_CC" nl
-                          (pad padding) "environment variable, or if it is empty, to cc")
+                        (pad padding) "environment variable, or if it is empty, to cc")
-                    (required #f)
+                  (required #f)
-                    (value #t))
+                  (value #t))
-        (compile-object "Compile object file instead of executable program"
+      (compile-object "Compile object file instead of executable program"
-                        (required #f)
-                        (value #f)
-                        (single-char #\c))
-        (emit-c "Emit C code"
-                (required #f)
-                (value #f)
-                (single-char #\C))
-        (public-interface "Get module's public interface"
-                          (required #f)
-                          (value #f))
-        (help "Show this help"
-              (required #f)
-              (value #f)
-              (single-char #\h))
-        (macro-expand "Emit macro-expanded semantically processed Sex code"
                       (required #f)
                       (value #f)
-                      (single-char #\m))
+                      (single-char #\c))
-        (output ,(fmt #f "Write output to file. Default file name is a.out." nl
+      (emit-c "Emit C code"
-                      (pad padding) "If -E or -m options are provided, defaults to stdout")
+                  (required #f)
-                (required #f)
+                  (value #f)
-                (value #t)
+                  (single-char #\C))
-                (single-char #\o)))))
+      (public-interface "Get module's public interface"
+                        (required #f)
+                        (value #f))
+      (help "Show this help"
+            (required #f)
+            (value #f)
+            (single-char #\h))
+      (macro-expand "Emit macro-expanded semantically processed Sex code"
+                    (required #f)
+                    (value #f)
+                    (single-char #\m))
+      (output ,(fmt #f "Write output to file. Default file name is a.out." nl
+                    (pad padding) "If -E or -m options are provided, defaults to stdout")
+              (required #f)
+              (value #t)
+              (single-char #\o)))))
 
-  (define (print-help)
+(define (print-help)
-    (fmt #t "Usage: sexc [options] filename [-- options-for-c-compiler]\n")
+  (fmt #t "Usage: sexc [options] filename [-- options-for-c-compiler]\n")
-    (fmt #t "Options:\n")
+  (fmt #t "Options:\n")
-    (fmt #t (usage opts-grammar))
+  (fmt #t (usage opts-grammar))
-    (fmt #t ""))
+  (fmt #t ""))
 
-  (define (help-arg? args)
+(define (help-arg? args)
-    (assoc 'help args))
+  (assoc 'help args))
 
-  (define (get-arg args arg-name default)
+(define (get-arg args arg-name default)
-    (let ((arg (assoc arg-name args)))
+  (let ((arg (assoc arg-name args)))
-      (if arg (cdr arg)
+    (if arg (cdr arg)
-          default)))
+        default)))
 
-  (define (get-rest-args args)
+(define (get-rest-args args)
-    (cdr (assoc '@ args)))
+  (cdr (assoc '@ args)))
 
-  (define (get-c-compiler-args args)
+(define (get-c-compiler-args args)
-    (filter (fn (string-prefix? "-" x)) (get-rest-args args)))
+  (filter (fn (string-prefix? "-" x)) (get-rest-args args)))
 
-  (define (get-input-file args)
+(define (get-input-file args)
-    (let ((rest-args (get-rest-args args)))
+  (let ((rest-args (get-rest-args args)))
-      (if (null? rest-args)
+    (if (null? rest-args)
-          'stdin
+        'stdin
-          (car rest-args))))
+        (car rest-args))))
 
-  (define (write-to-file-or-stdout output what)
+(define (write-to-file-or-stdout output what)
-    (if (eq? output 'default)
+  (if (eq? output 'default)
-        (what)
+      (what)
-        (with-output-to-file output
+      (with-output-to-file output
-          (fn (what)))))
+        (fn (what)))))
 
-  (define (emit-c-or-sex sex-forms output args)
+(define (emit-c-or-sex sex-forms output args)
-    (write-to-file-or-stdout output
+  (write-to-file-or-stdout output
-                             (lambda ()
+   (lambda ()
-                               (if (get-arg args 'macro-expand #f)
+    (if (get-arg args 'macro-expand #f)
-                                   (map pp sex-forms)
+        (map pp sex-forms)
-                                   (emit-c sex-forms)))))
+        (emit-c sex-forms)))))
 
-  (define (compile-to-file sex-forms output args)
+(define (compile-to-file sex-forms output args)
-    (let ((compiler (or (get-arg args 'c-compiler #f)
+  (let ((compiler (or (get-arg args 'c-compiler #f)
-                        (get-env-var "SEX_CC")
+                      (get-env-var "SEX_CC")
-                        "cc"))
+                      "cc"))
-          (out-file (if (eq? output 'default)
+        (out-file (if (eq? output 'default)
-                        "a.out"
+                      "a.out"
-                        output)))
+                      output)))
-      (call-with-values
+    (call-with-values
-          (lambda ()
+        (lambda ()
-            (process compiler (append (list "-o" out-file "-x" "c")
+          (process compiler (append (list "-o" out-file "-x" "c")
-                                      (if (get-arg args 'compile-object #f)
+                                    (if (get-arg args 'compile-object #f)
-                                          (list "-c")
+                                        (list "-c")
-                                          (list))
+                                        (list))
-                                      (list "-")  ; read stdin
+                                    (list "-")  ; read stdin
-                                      (get-c-compiler-args args))))
+                                    (get-c-compiler-args args))))
-        (lambda (out-port in-port pid)
+      (lambda (out-port in-port pid)
-          (with-output-to-port in-port
+        (with-output-to-port in-port
-            (lambda () (emit-c sex-forms)))
+          (lambda () (emit-c sex-forms)))
-          (close-output-port in-port)
+        (close-output-port in-port)
-          (process-wait pid)))))
+        (process-wait pid)))))
 
-  (define (semantic-process-forms raw-forms input-source)
+(define (semantic-process-forms raw-forms input-source)
-    (if (eq? input-source 'stdin)
+  (if (eq? input-source 'stdin)
-        (semen-process raw-forms)
+      (semen-process raw-forms)
-        (with-directory input-source
+      (with-directory input-source
-                        (semen-process raw-forms))))
+        (semen-process raw-forms))))
 
-  (define prelude
+(define (main)
-    '((include inttypes.h)
+  (let* ((raw-args (command-line-arguments))
+         (args (getopt-long raw-args
+                            opts-grammar))
+         (output (get-arg args 'output 'default))
+         (help (help-arg? args))
 
-      (typedef u8 uint8-t)
+         (input (get-input-file args))
-      (typedef i8 int8-t)
+         (current-dir (current-directory)))
-      (typedef u16 uint16-t)
+    (call/cc
-      (typedef i16 int16-t)
+     (lambda (return)
-      (typedef u32 uint32-t)
+       (when help
-      (typedef i32 int32-t)
+         (print-help)
-      (typedef u64 uint64-t)
+         (return #f))
-      (typedef i64 int64-t)))
+       (when (get-arg args 'public-interface #f)
+         (assert (not (eq? input 'stdin)) "Error: --public-interface requires file argument")
 
-  (define (main)
+         (write-to-file-or-stdout
-    (let* ((raw-args (command-line-arguments))
+          output
-           (args (getopt-long raw-args
+          (fn
-                              opts-grammar))
+           (map pp (reverse
-           (output (get-arg args 'output 'default))
+                    (read-public-interface input)))))
-           (help (help-arg? args))
+         (return #f))
+       (load-persistent-module-paths)
 
-           (input (get-input-file args))
+       (let* ((raw-forms (read-raw-forms input))
-           (current-dir (current-directory)))
+              (sex-forms (semantic-process-forms raw-forms input)))
-      (call/cc
+         (if (or (get-arg args 'macro-expand #f)
-       (lambda (return)
+                 (get-arg args 'emit-c #f))
-         (when help
+             ;; Emit processed and macro-expanded sex code, or emit C code
-           (print-help)
+             (emit-c-or-sex sex-forms output args)
-           (return #f))
+             ;; Compile file!
-         (when (get-arg args 'public-interface #f)
+             (compile-to-file sex-forms output args)))))))
-           (assert (not (eq? input 'stdin)) "Error: --public-interface requires file argument")
-
-           (write-to-file-or-stdout
-            output
-            (fn
-             (map pp (reverse
-                      (read-public-interface input)))))
-           (return #f))
-         (load-persistent-module-paths)
-
-         (sex-fmt-current-file (to-absolute-pathname input))
-         (let* ((raw-forms (append prelude (read-raw-forms input)))
-                (sex-forms (semantic-process-forms raw-forms input)))
-           (if (or (get-arg args 'macro-expand #f)
-                   (get-arg args 'emit-c #f))
-               ;; Emit processed and macro-expanded sex code, or emit C code
-               (emit-c-or-sex sex-forms output args)
-               ;; Compile file!
-               (compile-to-file sex-forms output args))))))))

tests/basic.scm

@@ -1,31 +1,35 @@
-(test-group "basic"
+(test-begin "basic")
 
-  ;; unkebabify
+;;; unkebabify
-  (test '- (unkebabify '-))
+(test '- (unkebabify '-))
-  (test '-- (unkebabify '--))
+(test '-- (unkebabify '--))
-  (test '-> (unkebabify '->))
+(test '-> (unkebabify '->))
-  (test '-= (unkebabify '-=))
+(test '-= (unkebabify '-=))
-  (test 'kebab_case (unkebabify 'kebab-case))
+(test 'kebab_case (unkebabify 'kebab-case))
-  (test '_what_ (unkebabify '-what-))
+(test '_what_ (unkebabify '-what-))
-  (test 'this->member (unkebabify 'this->member))
+(test 'this->member (unkebabify 'this->member))
-  (test '_this_->_member_ (unkebabify '-this-->-member-))
+(test '_this_->_member_ (unkebabify '-this-->-member-))
-  (test '__->>> (unkebabify '--->>>))
+(test '__->>> (unkebabify '--->>>))
 
-  ;; atom-to-fmt-c
+;;; atom-to-fmt-c
-  (test '%fun (atom-to-fmt-c 'fn))
+(test '%fun (atom-to-fmt-c 'fn))
-  (test '%prototype (atom-to-fmt-c 'prototype))
+(test '%prototype (atom-to-fmt-c 'prototype))
-  (test '%block-begin (atom-to-fmt-c 'begin))
+(test '%var (atom-to-fmt-c 'var))
-  (test '%define (atom-to-fmt-c 'define))
+(test '%block-begin (atom-to-fmt-c 'begin))
-  (test '%pointer (atom-to-fmt-c 'pointer))
+(test '%define (atom-to-fmt-c 'define))
-  (test '%array (atom-to-fmt-c 'array))
+(test '%pointer (atom-to-fmt-c 'pointer))
-  (test 'vector-ref (atom-to-fmt-c '¤))
+(test '%array (atom-to-fmt-c 'array))
-  (test '%include (atom-to-fmt-c 'include))
+(test 'vector-ref (atom-to-fmt-c '@))
+(test '%include (atom-to-fmt-c 'include))
+(test '%cast (atom-to-fmt-c 'cast))
 
-  ;; c89 stuff
+;;; c89 stuff
-  (test 'int (atom-to-fmt-c 'bool))
+(test 'int (atom-to-fmt-c 'bool))
-  (test 1 (atom-to-fmt-c 'true))
+(test 1 (atom-to-fmt-c 'true))
-  (test 0 (atom-to-fmt-c 'false))
+(test 0 (atom-to-fmt-c 'false))
 
-  ;; make-field-access
+;;; make-field-access
-  (test 'a.b (make-field-access '(.b a)))
+(test 'a.b (make-field-access '(.b a)))
-  (test 'a.b.c (make-field-access '(.c a.b))))
+(test 'a.b.c (make-field-access '(.c a.b)))
+
+(test-end)

tests/fmt-c-writer.scm

@@ -1,159 +0,0 @@
-;;; Types
-(test-group "fmt-writer"
-
-  (test
-   '(const int)
-   (walk-type '(const int)))
-
-  (test
-   '(%array (const char) 512)
-   (walk-type '(¤ const char 512)))
-
-  (test
-   '(%array (float) 512)
-   (walk-type '(¤ (float) 512)))
-
-  (test
-   '(%array (const char) 512)
-   (walk-type '(¤ (const char) 512)))
-
-  (test
-   '(%array (const char))
-   (walk-type '(¤ const char)))
-
-  (test
-   '(%array (const char))
-   (walk-type '(¤ (const char))))
-
-  (test
-   '(%array float 8)
-   (walk-type '(¤ float 8)))
-
-  (test
-   "Pointer to const char"
-   '(const char *)
-   (walk-type '(* const char)))
-
-  (test
-   "Const pointer to const char"
-   '(const char * const)
-   (walk-type '(const * const char)))
-
-  (test
-   '(%fun void ((int) (float) (%array (struct what * const))))
-   (walk-type '(fn ((int) (float) (¤ (const * struct what))) void)))
-
-  (test
-   '(%fun void ((int) (%array float) (%array (struct what * const))))
-   (walk-type '(fn ((int) (¤ float) (¤ (const * struct what))) void)))
-
-  (test
-   '(%array (%fun void ((int) (%array float) (%array (struct what * const)))))
-   (walk-type '(¤ (fn ((int) (¤ float) (¤ (const * struct what))) void))))
-
-  ;; Type convert to C
-  (test
-   '(int)
-   (type-convert-to-c '(int)))
-
-  (test
-   '(* int)
-   (type-convert-to-c '(int *)))
-
-  (test
-   '(* const int)
-   (type-convert-to-c '(const int *)))
-
-  (test
-   '(const * const char)
-   (type-convert-to-c '(const char * const)))
-
-;;; Variable defs
-  (test
-   '(%var (%array float 8) a)
-   (walk-var '(var a (¤ float 8))))
-
-  (test
-   '(%var (int *) a (& n))
-   (walk-var '(var a (* int) (& n))))
-
-  (test
-   '(%var (const int *) a (& n))
-   (walk-var '(var a (* const int) (& n))))
-
-  (test
-   '(%var (struct suc) s)
-   (walk-var '(var s (struct suc))))
-
-  (test
-   '(%var (const struct suc *) s s1)
-   (walk-var '(var s (* const struct suc) s1)))
-
-  (test
-   '(%var (const struct suc *) s s1)
-   (walk-var '(var s (* (const struct suc)) s1)))
-
-  (test
-   '(%var (struct suc) s (hoge piyo))
-   (walk-var '(var s (struct suc) (hoge piyo))))
-
-  (test
-   '(%var (struct suc *) s (hoge piyo))
-   (walk-var '(var s (* struct suc) (hoge piyo))))
-
-;;; Fn defs
-  (test
-   '(%fun void puk ((int) (%array float 8)))
-   (walk-fn-def '(fn puk ((int) (¤ float 8)) void)))
-
-  (test
-   '(%fun int main ((int argc) ((%array (const char)) argv))
-          (return 0))
-   (walk-fn-def
-    '(fn main ((argc int) (argv (¤ const char))) int
-         (return 0))))
-  (test
-   '(%fun int quxu (((struct piq *) bar))
-          (return 0))
-   (walk-fn-def
-    '(fn quxu ((bar (* struct piq))) int
-         (return 0))))
-
-  (test
-   '(%fun int quxu (((struct piq *) bar) ((%array (struct tt *)) ploop))
-          (return 0))
-   (walk-fn-def
-    '(fn quxu ((bar (* struct piq)) (ploop (¤ * struct tt))) int
-         (return 0))))
-
-  ;; Structs
-  (test
-   '(struct no_kebab ((int a) (float f)))
-   (walk-struct '(struct no-kebab ((a int) (f float)))))
-
-  (test
-   '(struct settings ((u32 x y w h)
-                      ((%array (struct ((float r g b a))) 4) colors)))
-   (walk-struct
-    '(struct settings
-             ((x y w h u32)
-              (colors [¤ struct ((r g b a float)) 4])))))
-
-  (test
-   '(struct settings ((u32 x y w h)
-                      ((%array (struct color ((float r g b a))) 4) colors)))
-   (walk-struct
-    '(struct settings
-             ((x y w h u32)
-              (colors [¤ struct color ((r g b a float)) 4])))))
-
-  (test
-   '(struct mega_kebab ((int a)
-                        ((struct ((int year) (int month) (int day))) dob)
-                        ((%fun int ((int) (%array int))) min)))
-   (walk-struct '(struct mega-kebab
-                         ((a int)
-                          (dob (struct ((year int)
-                                        (month int)
-                                        (day int))))
-                          (min (fn ((int) (¤ int)) bool)))))))

tests/reader.scm

@@ -1,17 +0,0 @@
-(import (chicken port))
-
-(define-syntax reader-test
-  (syntax-rules ()
-    ((reader-test result string)
-     (test result
-           (with-input-from-string string
-             (lambda () (read-raw-forms 'stdin)))))))
-
-(test-group "reader"
-  ;; []-syntax. For array types and array access expressions
-  (reader-test '((¤ * char)) "[* char]")
-  (reader-test '((¤ * * char const 512)) "[* * char const 512]")
-  (reader-test '((¤)) "[]")
-  (reader-test '((¤ (¤))) "[[]]")
-  (reader-test '((¤ (¤ const char))) "[[const char]]")
-)

tests/run.scm

@@ -9,9 +9,6 @@
 
 (include "basic.scm")
 (include "semen.scm")
-(include "reader.scm")
-(include "fmt-c-writer.scm")
-(include "utils.scm")
 
 ;;; Should be the last in the test suite
 (test-exit)

tests/semen.scm

@@ -1,5 +1,3 @@
-(import srfi-69)
-
 (define print-str-fn
   '(fn void print-str ((string s))
        (printf "%s" s)))
@@ -8,49 +6,48 @@
   '(pub fn float sum ((int a) (int b))
         (return (cast float (+ a b)))))
 
-(test-group "semen"
+(test-begin "semen")
-  (test-assert (sex-fn? print-str-fn))
+(test-assert (sex-fn? print-str-fn))
-  (test #f (sex-fn-public? print-str-fn))
+(test #f (sex-fn-public? print-str-fn))
-  (test 'void (sex-fn-return-type print-str-fn))
+(test 'void (sex-fn-return-type print-str-fn))
-  (test 'print-str (sex-fn-name print-str-fn))
+(test 'print-str (sex-fn-name print-str-fn))
-  (test '((string s)) (sex-fn-arglist print-str-fn))
+(test '((string s)) (sex-fn-arglist print-str-fn))
-  (test '(fn void print-str ((string s))) (sex-fn-prototype print-str-fn))
+(test '(fn void print-str ((string s))) (sex-fn-prototype print-str-fn))
-  (test '((printf "%s" s)) (sex-fn-body print-str-fn))
+(test '((printf "%s" s)) (sex-fn-body print-str-fn))
 
-  (test-assert (sex-fn? sum-fn))
+(test-assert (sex-fn? sum-fn))
-  (test #t (sex-fn-public? sum-fn))
+(test #t (sex-fn-public? sum-fn))
-  (test 'float (sex-fn-return-type sum-fn))
+(test 'float (sex-fn-return-type sum-fn))
-  (test 'sum (sex-fn-name sum-fn))
+(test 'sum (sex-fn-name sum-fn))
-  (test '((int a) (int b)) (sex-fn-arglist sum-fn))
+(test '((int a) (int b)) (sex-fn-arglist sum-fn))
-  (test '(pub fn float sum ((int a) (int b))) (sex-fn-prototype sum-fn))
+(test '(pub fn float sum ((int a) (int b))) (sex-fn-prototype sum-fn))
-  (test '((return (cast float (+ a b)))) (sex-fn-body sum-fn))
+(test '((return (cast float (+ a b)))) (sex-fn-body sum-fn))
 
-  (let ((sex-code
+(let ((sex-code
-         '((defmacro (sum-var name a b c)
+       '((defmacro (sum-var name a b c)
-             `(var ,name ,(+ a b c)))
+           `(var ,name ,(+ a b c)))
 
-           (sum-var v 1 2 3))))
+         (sum-var v 1 2 3))))
 
-    (test '((var v 6)) (semen-process sex-code)))
+  (test '((var v 6)) (semen-process sex-code)))
 
 ;;; Macro expansion
 
-  (define (form-identity form env)
+(test 'a (semen-walk-form 'a identity))
-    form)
+(test '(a b c) (semen-walk-form '(a b c) identity))
 
-  (test 'a (semen-walk-form 'a form-identity (make-hash-table)))
+(test 'a (semen-macro-expand 'a))
-  (test '(a b c) (semen-walk-form '(a b c) form-identity (make-hash-table)))
+(test '(a b c) (semen-macro-expand '(a b c)))
 
-  (test 'a (semen-macro-expand 'a))
+(let ((sex-code-macro
-  (test '(a b c) (semen-macro-expand '(a b c)))
+       '((defmacro (x10 a)
+           `(* 10 ,a))
 
-  (let ((sex-code-macro
+         (fn void foo ((int a) (int b))
-         '((defmacro (x10 a)
+             (return (+ a (x10 b)))))))
-             `(* 10 ,a))
 
-           (fn void foo ((int a) (int b))
+  (test '((fn void foo ((int a) (int b))
-               (return (+ a (x10 b)))))))
+              (return (+ a (* 10 b)))))
+        (semen-process sex-code-macro)))
 
-    (test '((fn void foo ((int a) (int b))
+(test-end)
-                (return (+ a (* 10 b)))))
-          (semen-process sex-code-macro))))

tests/utils.scm

@@ -1,22 +0,0 @@
-(test-group "utils"
-
-  (test
-   '((1) (2) (3))
-   (list-split '(1 * 2 * 3) '*))
-
-  (test
-   '((1 2 3))
-   (list-split '(1 2 3) '*))
-
-  (test
-   '(() (1) (2) (3) ())
-   (list-split '(* 1 * 2 * 3 *) '*))
-
-  (test
-   '((const) (const struct something))
-   (list-split '(const * const struct something) '*))
-
-  (test
-   '(1 * 2 * 3)
-   (list-join '(1 2 3) '*))
-)

utils.macros.scm

@@ -1 +1,17 @@
 (import (chicken process-context))
+
+(define-syntax prog1
+  (syntax-rules ()
+    ((prog1 form . forms)
+     (let ((res form))
+       (begin . forms)
+       res))))
+
+(define-syntax with-directory
+  (syntax-rules ()
+    ((with-directory path form . forms)
+     (let ((current-dir (current-directory)))
+       (set-working-directory path)
+       (prog1
+        (begin form . forms)
+        (change-directory current-dir))))))

utils.scm

@@ -1,77 +1,19 @@
-(module utils
+(declare (unit utils))
-    (get-env-var
-     set-working-directory
-     to-absolute-pathname
-     list-split
-     list-join
-     recons
-     with-directory
-     )
 
-  (import
+(include "utils.macros.scm")
-    scheme
-    (chicken base)
-    (chicken pathname)
-    (chicken process-context)
-    srfi-1)
 
-  (define-syntax prog1
+(import
-    (syntax-rules ()
+  (chicken pathname)
-      ((prog1 form . forms)
+  (chicken process-context))
-       (let ((res form))
-         (begin . forms)
-         res))))
 
-  (define-syntax with-directory
+(define (get-env-var name)
-    (syntax-rules ()
+  (get-environment-variable name))
-      ((with-directory path form . forms)
-       (let ((current-dir (current-directory)))
-         (set-working-directory path)
-         (prog1
-          (begin form . forms)
-          (change-directory current-dir))))))
 
-  (define (get-env-var name)
+(define (set-working-directory file)
-    (get-environment-variable name))
+  (change-directory
-
+   (normalize-pathname
-  (define (set-working-directory file)
+    (if (absolute-pathname? file)
-    (change-directory
+        (pathname-directory file)
-     (normalize-pathname
-      (if (absolute-pathname? file)
-          (pathname-directory file)
-          (make-absolute-pathname
-           (current-directory)
-           (pathname-directory file))))))
-
-  (define (to-absolute-pathname pathname)
-    (if (absolute-pathname? pathname)
-        pathname
         (make-absolute-pathname
          (current-directory)
-         pathname)))
+         (pathname-directory file))))))
-
-  (define (list-split src-list split-elt)
-    ;; split '(1 2 / 3 4 / 5 6) by '/ -> '((1 2) (3 4) (5 6))
-    (fold (lambda (elt acc)
-            (if (eq? elt split-elt)
-                (append acc (list (list)))
-                (append (drop-right acc 1)
-                        (list (append (last acc) (list elt))))))
-          (list (list))
-          src-list))
-
-  (define (list-join lists join-by)
-    (drop-right
-     (fold (lambda (elt acc)
-             (append acc (list elt) (list join-by)))
-           (list)
-           lists)
-     1))
-
-;;; Reconstruct form
-  (define (recons old-cons new-car new-cdr)
-    (if (and (eq? new-car (car old-cons))
-             (eq? new-cdr (cdr old-cons)))
-        old-cons
-        (cons new-car new-cdr)))
-  )