util  Check-in [520b38deac]

Overview
Comment:add sexcp
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SHA3-256: 520b38deac100b0d9179113569423411871016119217ebe6ca74cc5d0cc2d1fd
User & Date: lexi on 2019-07-23 12:32:27
Other Links: manifest | tags
Context
2019-07-24
22:36
add support for conditionals, array indexing, and reference-taking check-in: 844294c3a4 user: lexi tags: trunk
2019-07-23
12:32
add sexcp check-in: 520b38deac user: lexi tags: trunk
2019-07-21
06:35
add clipserv check-in: 6a5d1f9f67 user: lexi tags: trunk
Changes

Modified clib/compose.c from [e0c5b0d583] to [d981619adf].

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#define _p(str) { sizeof str - 1, str }

typedef struct safestr {
	union {
		const char* ptr;
		char* mutptr;
	}; // im sorry okay

	bool heap;

	size_t len;
} safestr;


void delstr(safestr s) fn ({
	if (s.heap) { free(s.mutptr); }
});


void clrstr(safestr* s) fn ({

	delstr(*s);
	s->heap = false;

	s->ptr = NULL;
	s->len = 0;
})

char* compose(pstr* lst,size_t ct, size_t* strsz) fn({
	size_t len = 0;
	for (size_t i = 0; i < ct; ++i) {
		if (lst[i].len == 0) {
			if (lst[i].ptr == NULL) continue;
			lst[i].len = strlen(lst[i].ptr);
		}
		len += lst[i].len;
	}
	if (strsz != NULL) *strsz = len;
	if (len == 0) return NULL;

	
	char* str = malloc(len + 1);
	char* ptr = str;

	for (size_t i = 0; i < ct; ++i) {
		if (lst[i].len == 0) continue;
		strncpy(ptr,lst[i].ptr,lst[i].len);
		ptr += lst[i].len;
	}











	*ptr = 0;
	return str;
});





























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#define _p(str) { sizeof str - 1, str }

typedef struct safestr {
	union {
		const char* ptr;
		char* mutptr;
	}; // im sorry okay
#	ifndef k_static
		bool heap;
#	endif
	size_t len;
} safestr;

#ifndef k_static
	void delstr(safestr s) fn ({
		if (s.heap) { free(s.mutptr); }
	});
#endif

void clrstr(safestr* s) fn ({
#	ifndef k_static
		delstr(*s);
		s->heap = false;
#	endif
	s->ptr = NULL;
	s->len = 0;
})

size_t pstrsum(pstr* lst,size_t ct) fn({
	size_t len = 0;
	for (size_t i = 0; i < ct; ++i) {
		if (lst[i].len == 0) {
			if (lst[i].ptr == NULL) continue;
			lst[i].len = strlen(lst[i].ptr);
		}
		len += lst[i].len;
	}


})



char* pstrcoll(pstr* lst, size_t ct, char* ptr) fn({
	for (size_t i = 0; i < ct; ++i) {
		if (lst[i].len == 0) continue;
		strncpy(ptr,lst[i].ptr,lst[i].len);
		ptr += lst[i].len;
	}
	return ptr;
})

#ifndef k_static
char* compose(pstr* lst,size_t ct, size_t* strsz) fn({
	size_t len = pstrsum(lst,ct)
	if (strsz != NULL) *strsz = len;
	if (len == 0) return NULL;
	
	char* str = malloc(len + 1);
	char* ptr = pstrcoll(lst, ct, ptr);
	*ptr = 0;
	return str;
});
#endif

char* impose(pstr* lst,size_t ct, size_t* strsz, char* buf) fn({
	size_t len = pstrsum(lst,ct);
	if (strsz != NULL) *strsz = len;
	if (len == 0) return NULL;
	
	char* ptr = pstrcoll(lst, ct, buf);
	*ptr = 0;
	return ptr;
});

char* imprint(pstr lst, size_t* strsz, char* buf) fn({
	size_t len = pstrsum(&lst,1);
	if (strsz != NULL) *strsz = len;
	if (len == 0) return NULL;
	
	char* ptr = pstrcoll(&lst,1,buf);
	*ptr = 0;
	return ptr;
});
#undef fn

Modified clipserv/clip.b from [08bfad81fd] to [9f380b471d].

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					new-args: join new-args i ] ]
			main new-args yes
		]
		true [ usage ]
	]
]



quit/return main args no









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					new-args: join new-args i ] ]
			main new-args yes
		]
		true [ usage ]
	]
]

success: main args no
if eq? success true [
	quit/return 0
]
quit/return 1

Added scmlib/lisp-macro.scm version [ad02b3f2ba].

































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; [ʞ] lisp-macro
;  ~ lexi hale <lexi@hale.su>
;  © affero general public license
;  > (load "lib/lisp-macro.scm")

; enable use of the define-macro syntax in chicken scheme
; ex:	(define-macro (if-or-f . body)
;			`(if ,(car body) ,(cadr body) #f))

(define-syntax define-macro
	(er-macro-transformer (lambda (exp r c)
		`(define-syntax ,(caadr exp)
			(er-macro-transformer
				(lambda (,(cdadr exp) id-rename id-compare)
					(let ((,(cdadr exp) (cdr ,(cdadr exp))))
			 			,@(cddr exp))))))))

Added scmlib/select.scm version [ce284edc9d].



































































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; [ʞ] select.scm
;  ~ lexi hale <lexi@hale.su>
;  © CC0 / public domain
;  > (include "lisp-macro.scm")
;    (include "select.scm")
;  ? a reimplementation of (case) that lets you
;    specify your own evaluator function. same syntax,
;    except the expression to evaluate is preceeded by
;    a predicate function
;  = (select equal? "weed"
;        ("weed" 420)
;        ("sex" 69)
;        (else 42069)

(define-macro (select . body)
  (let* ([eqfn (list-ref body 0)]
         [expr (list-ref body 1)]
         [cases (cddr body)]
         [result (gensym)])
	(define (make-cond-entry case)
	  (let ([case-expr (car case)]
			[func (cdr case)])
		(if (eqv? case-expr 'else) (cons #t func)
			(cons (list eqfn result case-expr) func))))
	(define cond-entries (map make-cond-entry cases))
	 `(let ([,result ,expr]) (cond ,@cond-entries)))) 

(define-macro (maybe . body)
			  (let (( result (gensym) ))
				`(let (( ,result ,(cadr body) ))
				   (if ,result (let (( ,(car body) ,result ))
								 ,(cddr body))
					   #f))))

Added sexpc/example.cse version [58b3a515c7].





































































































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; [ʞ] example.cse
;  ~ lexi hale <lexi@hale.su>
;  - vim: ft=scheme
;  © CCO / public domain
;  $ ./sexpc example.cse
;  ? this file is an example program that can be
;    transpiled to valid C with sexpc.scm.
(use sys "unistd.h")
(use sys "stddef.h")
(use sys "stdint.h")
(use sys "string.h")

(@ (: sayl (string -> list))
   ; (@ … ) introduces a block of Scheme code that
   ; is evaluated in the program's environment, but
   ; whose value is silently ignored. this makes it
   ; good for defining globals you intend to use
   ; later in the program with (* … ) or (= … )
   ; blocks - see the paragraph below
   (define (sayl str)
	 `(add-> total (call write 1
	  ; the return value of a scheme expression will
	  ; be evaluated just like any other expression
	  ; and transformed into C code, so we can rely
	  ; on existing syntax instead of haven't to
	  ; generate raw strings of C
			,(string-append str "\\n")
			,(+ 1 (string-length str))))))

(decl sayhello ((ptr char) → int))
(def (total size_t) 0)

(def (main int (argc int) (argv (array (ptr char))))
	 (ret (call sayhello "dumbass")))

(def (sayhello int (name (ptr char)))
	 (* sayl "hello…")
	 ; a list prefixed with * indicates that it 
	 ; should be evaluated as a scheme expression
	 ; and its result then processed, instead of
	 ; being processed directly like (call) or
	 ; (def). scheme expressions may be inserted
	 ; anywhere a normal sexpc expression can. or
	 ; we could instead write (= (sayl "hello…"))
	 ; to accomplish the same effect; (= … ) is
	 ; really just shorthand for (* begin … )

	 (call write 1 name (call strlen name))
	 (ret total)
)

Added sexpc/sexpc.scm version [a27b738777].

































































































































































































































































































































































































































































































































































































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; [ʞ] sexpc.scm - sexp→c converter
;  ~ lexi hale <lexi@hale>
;  © GNU Affero GPL v3
;  $ chicken-csc -O5 sexpc.scm; strip sexpc
;  > ./sexpc <file>
;  ? a tool to convert sheets of s-expressions into
;    valid C, enabling the use of Scheme as a
;    preprocessor language. it also generates C type
;    definitions from a human-readable syntax,
;    removing the difficulties introduced by C's
;    legendarily inscrutable compound type syntax:
;    e.g.  (def r (array (const (ptr (char u128 ->
;                          (ptr (array 5 bool))))))),
;    which represents an array of const pointers to
;    functions taking a char and a 128-bit integer,
;    and returning a pointer to an array of five bools.
;    this emits the C type:
;      _Bool (((*(*const (((v)[])))(char, unsigned
;                                  __int128_t)))[5])
;    (as i'm sure you immediately guessed)
;    
;  → no dependencies besides the lisp-macro.scm file
;    bundled with it, and the chicken stdlib.

(import (chicken process-context))
(import (chicken condition))
(import (chicken pretty-print))
(import (chicken io))
(include "../scmlib/lisp-macro.scm")

(: *code-depth* integer)
(define *code-depth* 0) ; im sry

(: indent (string -> string))
(define (indent str)
  (define (iterate n)
	(if (eq? n 0) str
		(string-append "\t" (iterate (- n 1)))))
  (iterate *code-depth*))
(define (first fst . lst) fst)

(: string-reduce (list --> string))
(: words->string (list --> string))
(: separate (string list --> string))
(define (string-reduce lst) (foldl string-append "" lst))
(define (words->string lst) (foldl (lambda (a b) (string-append a " " b)) "" lst))
(define (separate delim lst) (foldl (lambda (a b)
									  (cond ((equal? a "") b)
											((equal? b "") a)
											(else (string-append a delim b)))) "" lst))

(: ensure-string ((or string symbol) -> string))
(define (ensure-string s) (if (string? s) s (if (symbol? s) (symbol->string s)
												(abort '(exn bad-string-or-symbol)))))
(define (handle fn)
  (define (err text) (string-append "\x1b[1;31m(fatal) \x1b[m" text))
  (condition-case (fn)
				  [(exn file) (display (err "could not open file"))]
				  [var () (display (err "an unknown error occurred"))]))

(define (make-evaluator)
  (let ((*eval-env* (interaction-environment)))
	(lambda (lst) (eval lst *eval-env*))))

(define evaluate-list (make-evaluator))

(define (c-def-function body) "<FUNC>")
(define (c-declare body)
  (cond ((>= (length body) 3)
		 (let ([fn-name   (list-ref  body 0)]
			   [fn-return (list-ref  body 1)]
			   [fn-args   (list-tail body 2)]) 
		   (c-function-decl fn-return fn-name fn-args)))
		((eqv? (length body) 2) ((eval-type (cadr body)) (car body)))
		(else (abort '(exn syntax declare)))))

(define (c-define body)
  (cond
	((and (list? (car body)) (>= (length body) 2))
	 (let ([contents (words->string (map (lambda(x) (eval-code #f x)) (cdr body)))])
	   (string-append (c-declare (car body))
					  (if (>= (length (car body)) 3) (string-append " {\n" contents "\n}")
						  (string-append " = " contents)))))
	(else (abort '(exn syntax define)))))

(: c-call-function (list -> string))
(define (c-call-function body)
  (unless (> (length body) 0) (abort '(exn parse call)))
  (string-append
	(eval-code #t (car body)) "(" (separate "," (map (lambda(x) (eval-code #t x)) (cdr body))) ")"))

(define (c-cpp-include body)
  (case (length body)
	((1) (if (string? (car body)) (string-append "#include \"" (car body) "\"\n")
			 (abort '(exn syntax include))))
	((2) (if (and (eqv? (car body) 'sys)
				  (string? (cadr body))) (string-append "#include <" (cadr body) ">\n")
			 (abort '(exn syntax include sys))))
	(else (abort '(exn syntax include)))))

(define (and* . body)
  (if (null? body) #t
	  (if (eq? #f (car body)) #f
		  (apply and* (cdr body)))))

(: c-function-decl (symbol
					 symbol
					 (list-of (or null
								  string
								  (pair (or symbol
											(list-of symbol)) symbol))) -> string))
(define (c-function-decl ret name args)
  (define (parse-arg a)
	(cond ((null? a) "void")
		  ((string? a) a)
		  ((symbol? a) ((eval-type a)""))
		  ((and (list? a) (= (length a) 2)) ((eval-type (cadr a)) (car a)))
		  ((list? a) ((eval-type a)""))
		  (else (abort '(exn syntax function-declare argument)))))
  (let ([arg-str (separate ", " (map parse-arg args))]
		[ret-fn (eval-type ret)])
	(ret-fn (string-append (ensure-string name) "(" arg-str ")"))))

(define-macro (with-deeper-context . body)
			  `(begin
				 (set! *code-depth* (+ 1 *code-depth*))
				 (first
				   ,@body
				   (set! *code-depth* (- *code-depth* 1))
				   )))

(: c-statement (string -> string))
(define (c-statement s) (indent (with-deeper-context (string-append s ";\n"))))

(: eval-type ((or null symbol list) -> ((or symbol string) -> string)))
(define (eval-type t)
  ; a type object is a function that is called with a name to
  ; generate a definition. this is necessary for the case of
  ; arrays and function pointers, which require special syntax
  (: simple ((or string symbol) --> string))
  (define (simple x) (lambda (n) (if (equal? "" n) x (string-append x " " (ensure-string n)))))
  (define (wrap ty name inner) (lambda (n)
									   (string-append (car ty) ((eval-type inner)
																(string-append (cdr ty) (car name) (ensure-string n) (cdr name))))))

  (define (parse-function-def t)
	(if (>= (length t) 3) ; function def?)
		(let ([arrow (list-ref t (- (length t) 2))])
		  (if (or (eqv? arrow '->) (eqv? arrow '→) (eqv? arrow '=>)) ; function def!
			  (let* ([args (butlast (butlast t))] ; rrrrrrgh
					 [ret (list-ref t (- (length t) 1))]
					 [arg-map (map (lambda (x) ((eval-type x)"")) args)])
				(lambda (n) (c-function-decl ret n arg-map)))
			  #f))
		#f))
  (define (parse-type t)
	(or (parse-function-def t)
		; not a function
		(case (car t)
		  ('ptr      (wrap '["".""]          '["(*".")"]           (cadr t)))
		  ('ref      (wrap '["".""]          '["(&".")"]           (cadr t))) ; for C++ support
		  ('const    (wrap '["".""]          '["const (".")"]      (cadr t)))
		  ('struct   (wrap '["struct ".""]   '["".""]              (cadr t)))
		  ('enum     (wrap '["enum ".""]     '["".""]              (cadr t)))
		  ('volatile (wrap '["".""]          '["volatile(".")"]    (cadr t)))
		  ('onlyptr  (wrap '["".""]          '["(*restrict ".")"]  (cadr t)))
		  ('static   (wrap '["".""]          '["static ".""]  (cadr t)))
		  ('array (if (null? (cddr t)) (wrap '["".""] '["((".")[])"] 
											 (cadr t))
					  (wrap '["".""] [cons "((" (string-append ")[" (eval-code #t (cadr t)) "])" )]  
							(caddr t))))
		  (else (abort '(exn syntax))))))

  (cond
	((null? t) (simple "void"))
	((symbol? t) (case t
				   ('bool (simple "_Bool"))
				   ('uchar (simple "unsigned char"))
				   ('schar (simple "signed char"))
				   ('ushort (simple "unsigned short"))
				   ('uint (simple "unsigned int"))
				   ('ulong (simple "unsigned long"))
				   ('ullong (simple "unsigned long long"))
				   ('llong (simple "long long"))
				   ('ldouble (simple "long double"))
				   ('u128 (simple "unsigned __int128_t"))
				   ('s128 (simple "__int128_t"))
				   (else (simple (symbol->string t)))))
	((list? t) (parse-type t))
	((string? t) (simple t))
	(else (abort '(exn syntax)))))

(define (c-construct type name body)
  (string-append type " " name " {\n"
				 (string-reduce (map (lambda(x) (indent (eval-code #f x))) body))
				 "\n}"))

(define (c-fn-return body)
  (string-append "return " (string-reduce (map (lambda(x) (eval-code #t x)) body))))

(define (c-math-op op body)
  (unless (= 2 (length body)) (abort '(exn syntax math)))
  (string-append "((" (eval-code #t (car body)) ")" op "(" (eval-code #t (cadr body)) "))"))
	  
(define (inter s x) (print* "-- " s ": ") (pretty-print x) x)
(: eval-code (boolean list -> string))
(define (eval-code inexpr data) 
  (define (ctx x) inexpr (if (eq? inexpr #t) x (c-statement x)))
  (define (deepen n) (set! *code-depth* (+ *code-depth* n)))
  (: dispatch (list -> string))
  (define (dispatch form body)
	(case form
	  ('* (eval-code inexpr (evaluate-list body)))
	  ('= (eval-code inexpr (evaluate-list (cons 'begin body))))
	  ('@ (eval (cons 'begin body)) "")
	  ('use (c-cpp-include body))
	  ('def  (first (c-statement (with-deeper-context (c-define body))) ))
	  ('decl  (first (c-statement (with-deeper-context (c-declare body))) ))
	  ('call (ctx (c-call-function body)))
	  ('list  (first (string-append "{" (separate "," (map (lambda(x) (eval-code #t x)) body)) "}") ))
	  ('struct  (first (ctx (c-construct "struct" (car form) (cdr form))) ))
	  ('enum    (first (ctx (c-construct "enum"   (car form) (cdr form))) ))
	  ('ret (c-statement (c-fn-return body)))
	  ('add (c-math-op "+" body))
	  ('add-> (ctx (c-math-op "+=" body)))
	  ('sub (c-math-op "-" body))
	  ('sub-> (ctx (c-math-op "-=" body)))
	  ('mul (c-math-op "*" body))
	  ('mul-> (ctx (c-math-op "*=" body)))
	  ('div (c-math-op "/" body))
	  ('div-> (ctx (c-math-op "/=" body)))
	  ('== (c-math-op "==" body))
	  ('-> (ctx (c-math-op "=" body)))
	  ('→  (ctx (c-math-op "=" body)))
	  ('; ";")
	  (else (string-append "<UNFOUND FORM " (symbol->string form) ">")) 
	  )))
  (cond
	((null? data) "")
	((symbol? data) (symbol->string data))
	((string? data) (string-append "\"" data "\""))
	((char? data) (apply string (list #\' data #\')))
	((number? data) (number->string data))
	((list? data) (let ([form (car data)]
						[body (cdr data)])
					(dispatch form body)))
	(else (abort '(exn syntax)))))

(define (parse-code file) (map (lambda(x) (eval-code #f x)) file))

(define (compile filename) 
  (let ([file (if (equal? filename "-") (read-list)
				  (handle (lambda()
							(call-with-input-file filename read-list))))])
	(string-reduce (parse-code file))))

(: usage (--> string))
(define (usage) "usage: sexpc <file>") 

(define (cull-args args switches params)
  (define (parse-switch switch)
	(cond
	  ((equal? switch "-") "-")
	  ((eqv? (string-ref switch 1) #\-) (substring switch 2))
	  (else (map string (string->list (substring switch 1))))))
  (define (is-switch arg)
	(eqv? (string-ref arg 0) #\-))
  (define (split p)
	(cons (flatten (map parse-switch switches)) p))
  (let* ([hd (if (null? args) '() (car args))]
		 [tl (if (null? hd) '() (cdr args))])
	(cond
	  ((null? args) (split params))
	  ((equal? "--" hd) (split (append params tl)))
	  ((is-switch hd) (cull-args tl (cons hd switches) params))
	  (else (cull-args tl switches
					   (cons hd params)))))) 

(define (main args)
  (let* ([switches-and-params (cull-args args '() '())]
		 [switches (car switches-and-params)]
		 [params (cdr switches-and-params)])
	(cond
	  ((null? params) (usage))
	  ((eqv? (length params) 1) (compile (car params)))
	  (else (usage)))))

(cond-expand (csi) (else (display (main (command-line-arguments)))))

Added sexpc/type-tests.scm version [47bc0863a3].





























































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(include "sexpc.scm")
((eval-type '()) 'v);

(define (test form)
  (print ((eval-type form) 'v)))

(define tests '(
	int char float uint
	(struct chungus_t)
	(ptr int) (array char)
	(array 5 (const int)) (const int)
	(const (ptr (array 5 (const int))))
	(const (ptr int))
	(array 5 (ptr int))
	(ref (array 5 int))
	(ptr (array (volatile char)))
	(const (ptr float))
	(ptr int)
	(ullong schar -> (ptr (bool u128 -> ldouble)))
	(int -> chungus_t)
	(ptr (int -> chungus_t))
	(array 5 (ptr (int -> chungus_t)))
	((array 5 (ptr int)) -> (const (ptr (array 3 int))))
    ; int (((*const (v(int (*(())[5])))))[3])
    ; int (* const v(int *[5]))[3]
(array (const (ptr (char u128 -> (ptr (array 5 bool))))))
	
	(array 5 (const (ref char)))))

(map test tests)