Parser/pgenmain.c

   1 /***********************************************************
   2 Copyright 1991, 1992, 1993 by Stichting Mathematisch Centrum,
   3 Amsterdam, The Netherlands.
   4
   5                         All Rights Reserved
   6
   7 Permission to use, copy, modify, and distribute this software and its
   8 documentation for any purpose and without fee is hereby granted,
   9 provided that the above copyright notice appear in all copies and that
  10 both that copyright notice and this permission notice appear in
  11 supporting documentation, and that the names of Stichting Mathematisch
  12 Centrum or CWI not be used in advertising or publicity pertaining to
  13 distribution of the software without specific, written prior permission.
  14
  15 STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
  16 THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
  17 FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
  18 FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  21 OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  22
  23 ******************************************************************/
  24
  25 /* Parser generator main program */
  26
  27 /* This expects a filename containing the grammar as argv[1] (UNIX)
  28    or asks the console for such a file name (THINK C).
  29    It writes its output on two files in the current directory:
  30    - "graminit.c" gets the grammar as a bunch of initialized data
  31    - "graminit.h" gets the grammar's non-terminals as #defines.
  32    Error messages and status info during the generation process are
  33    written to stdout, or sometimes to stderr. */
  34
  35 #include "pgenheaders.h"
  36 #include "grammar.h"
  37 #include "node.h"
  38 #include "parsetok.h"
  39 #include "pgen.h"
  40
  41 int debugging;
  42
  43 /* Forward */
  44 grammar *getgrammar PROTO((char *filename));
  45 #ifdef macintosh
  46 int main PROTO((int, char **));
  47 char *askfile PROTO((void));
  48 #endif
  49
  50 void
  51 goaway(sts)
  52         int sts;
  53 {
  54         exit(sts);
  55 }
  56
  57 int
  58 main(argc, argv)
  59         int argc;
  60         char **argv;
  61 {
  62         grammar *g;
  63         node *n;
  64         FILE *fp;
  65         char *filename;
  66
  67 #ifdef macintosh
  68         filename = askfile();
  69 #else
  70         if (argc != 2) {
  71                 fprintf(stderr, "usage: %s grammar\n", argv[0]);
  72                 goaway(2);
  73         }
  74         filename = argv[1];
  75 #endif
  76         g = getgrammar(filename);
  77         fp = fopen("graminit.c", "w");
  78         if (fp == NULL) {
  79                 perror("graminit.c");
  80                 goaway(1);
  81         }
  82         printf("Writing graminit.c ...\n");
  83         printgrammar(g, fp);
  84         fclose(fp);
  85         fp = fopen("graminit.h", "w");
  86         if (fp == NULL) {
  87                 perror("graminit.h");
  88                 goaway(1);
  89         }
  90         printf("Writing graminit.h ...\n");
  91         printnonterminals(g, fp);
  92         fclose(fp);
  93         goaway(0);
  94 }
  95
  96 grammar *
  97 getgrammar(filename)
  98         char *filename;
  99 {
 100         FILE *fp;
 101         node *n;
 102         grammar *g0, *g;
 103
 104         fp = fopen(filename, "r");
 105         if (fp == NULL) {
 106                 perror(filename);
 107                 goaway(1);
 108         }
 109         g0 = meta_grammar();
 110         n = NULL;
 111         parsefile(fp, filename, g0, g0->g_start, (char *)NULL, (char *)NULL, &n);
 112         fclose(fp);
 113         if (n == NULL) {
 114                 fprintf(stderr, "Parsing error.\n");
 115                 goaway(1);
 116         }
 117         g = pgen(n);
 118         if (g == NULL) {
 119                 printf("Bad grammar.\n");
 120                 goaway(1);
 121         }
 122         return g;
 123 }
 124
 125 #ifdef macintosh
 126 char *
 127 askfile()
 128 {
 129         char buf[256];
 130         static char name[256];
 131         printf("Input file name: ");
 132         if (fgets(buf, sizeof buf, stdin) == NULL) {
 133                 printf("EOF\n");
 134                 goaway(1);
 135         }
 136         /* XXX The (unsigned char *) case is needed by THINK C 3.0 */
 137         if (sscanf(/*(unsigned char *)*/buf, " %s ", name) != 1) {
 138                 printf("No file\n");
 139                 goaway(1);
 140         }
 141         return name;
 142 }
 143 #endif
 144
 145 void
 146 fatal(msg)
 147         char *msg;
 148 {
 149         fprintf(stderr, "pgen: FATAL ERROR: %s\n", msg);
 150         goaway(1);
 151 }
 152
 153 #ifdef macintosh
 154 /* ARGSUSED */
 155 int
 156 guesstabsize(path)
 157         char *path;
 158 {
 159         return 4;
 160 }
 161 #endif
 162
 163 /* XXX TO DO:
 164    - check for duplicate definitions of names (instead of fatal err)
 165 */