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repl.c
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/* 0-clause BSD */
/* gcc -o repl repl.c s7.o -Wl,-export-dynamic -lm -I. -ldl */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifndef _MSC_VER
#include <errno.h>
#include <unistd.h>
#endif
#include "s7.h"
char* str_r7rs_define_library=
"(define-macro (define-library libname . body) ; |(lib name)| -> environment\n"
" `(define ,(symbol (object->string libname))\n"
" (with-let (sublet (unlet)\n"
" (cons 'import import)\n"
" (cons '*export* ())\n"
" (cons 'export (define-macro (,(gensym) . names)\n"
" `(set! *export* (append ',names *export*)))))\n"
" ,@body\n"
" (apply inlet\n"
" (map (lambda (entry)\n"
" (if (or (member (car entry) '(*export* export import))\n"
" (and (pair? *export*)\n"
" (not (member (car entry) *export*))))\n"
" (values)\n"
" entry))\n"
" (curlet))))))\n";
char* str_r7rs_library_filename=
"(unless (defined? 'r7rs-import-library-filename)\n"
" (define (r7rs-import-library-filename libs)\n"
" (when (pair? libs)\n"
" (let ((lib-filename (let loop ((lib (if (memq (caar libs) '(only except prefix rename))\n"
" (cadar libs)\n"
" (car libs)))\n"
" (name \"\"))\n"
" (set! name (string-append name (symbol->string (car lib))))\n"
" (if (null? (cdr lib))\n"
" (string-append name \".scm\")\n"
" (begin\n"
" (set! name (string-append name \"/\"))\n"
" (loop (cdr lib) name))))))\n"
" (unless (member lib-filename (*s7* 'file-names))\n"
" (load lib-filename)))\n"
" (r7rs-import-library-filename (cdr libs)))))\n";
char* str_r7rs_import=
"(define-macro (import . libs)\n"
" `(begin\n"
" (r7rs-import-library-filename ',libs)\n"
" (varlet (curlet)\n"
" ,@(map (lambda (lib)\n"
" (case (car lib)\n"
" ((only)\n"
" `((lambda (e names)\n"
" (apply inlet\n"
" (map (lambda (name)\n"
" (cons name (e name)))\n"
" names)))\n"
" (symbol->value (symbol (object->string (cadr ',lib))))\n"
" (cddr ',lib)))\n"
" ((except)\n"
" `((lambda (e names)\n"
" (apply inlet\n"
" (map (lambda (entry)\n"
" (if (member (car entry) names)\n"
" (values)\n"
" entry))\n"
" e)))\n"
" (symbol->value (symbol (object->string (cadr ',lib))))\n"
" (cddr ',lib)))\n"
" ((prefix)\n"
" `((lambda (e prefx)\n"
" (apply inlet\n"
" (map (lambda (entry)\n"
" (cons (string->symbol \n"
" (string-append (symbol->string prefx) \n"
" (symbol->string (car entry)))) \n"
" (cdr entry)))\n"
" e)))\n"
" (symbol->value (symbol (object->string (cadr ',lib))))\n"
" (caddr ',lib)))\n"
" ((rename)\n"
" `((lambda (e names)\n"
" (apply inlet\n"
" (map (lambda (entry)\n"
" (let ((info (assoc (car entry) names)))\n"
" (if info\n"
" (cons (cadr info) (cdr entry))\n"
" entry))) \n"
" e)))\n"
" (symbol->value (symbol (object->string (cadr ',lib))))\n"
" (cddr ',lib)))\n"
" (else\n"
" `(let ((sym (symbol (object->string ',lib))))\n"
" (if (not (defined? sym))\n"
" (format () \"~A not loaded~%\" sym)\n"
" (symbol->value sym))))))\n"
" libs))))\n";
#ifndef _MSC_VER
static char*
realdir (s7_scheme* sc, const char* filename) {
char* path;
char* p;
if (!strchr (filename, '/')) {
if (access ("libc_s7.so", F_OK) != 0) {
if ((access ("libc.scm", F_OK) == 0) &&
(access ("cload.scm", F_OK) == 0)) {
s7_load (sc, "cload.scm");
s7_load (sc, "libc.scm");
return (NULL);
}
fprintf (stderr,
"%s needs libc_s7.so (give the explicit repl pathname or build "
"it by running: repl libc.scm)\n",
filename); /* env PATH=/home/bil/cl repl */
exit (2);
}
return (
NULL); /* we're in the libc_s7.so directory, I hope (user could start a
version of s7 that does not match the local libc_s7.so...) */
}
if (!(path= realpath (filename, NULL))) {
fprintf (stderr, "%s: %s\n", strerror (errno), filename);
exit (2);
}
if (!(p= strrchr (path, '/'))) {
free (path);
fprintf (stderr, "please provide the full pathname for %s\n", filename);
exit (2);
}
if (p > path) *p= '\0';
else p[1]= 0;
return (path);
}
#endif
int
main (int argc, char** argv) {
s7_scheme* sc;
sc= s7_init ();
s7_eval_c_string (sc, str_r7rs_define_library);
s7_eval_c_string (sc, str_r7rs_library_filename);
s7_eval_c_string (sc, str_r7rs_import);
if (argc >= 2) {
if (strcmp (argv[1], "-e") == 0) /* repl -e '(+ 1 2)' */
{
s7_pointer x;
x= s7_eval_c_string (sc, argv[2]);
fprintf (stdout, "%s\n", s7_object_to_c_string (sc, x));
return (0);
}
if (strcmp (argv[1], "--version") == 0) {
fprintf (stdout, "s7: %s, %s\n", S7_VERSION, S7_DATE);
return (0);
}
fprintf (stderr, "load %s\n", argv[1]); /* repl test.scm */
errno= 0;
if (!s7_load (sc, argv[1])) {
fprintf (stderr, "%s: %s\n", strerror (errno), argv[1]);
return (2);
}
}
else {
#ifdef _MSC_VER
while (true) {
char buffer[512];
fprintf (stdout, "\n> ");
if (!fgets (buffer, 512, stdin)) break; /* error or ctrl-D */
if (((buffer[0] != '\n') || (strlen (buffer) > 1))) {
char response[1024];
snprintf (response, 1024, "(write %s)", buffer);
s7_eval_c_string (sc, response);
}
}
fprintf (stdout, "\n");
if (ferror (stdin)) fprintf (stderr, "read error on stdin\n");
#else
#ifdef S7_LOAD_PATH
s7_add_to_load_path (sc, S7_LOAD_PATH);
#else
char* dir;
dir= realdir (sc, argv[0]);
if (dir) {
s7_add_to_load_path (sc, dir);
free (dir);
}
#endif
s7_repl (sc);
#endif
}
return (0);
}