Parser/pgenmain.c

   1 /***********************************************************
   2 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
   3 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 /* XXX TO DO:
  36    - check for duplicate definitions of names (instead of fatal err)
  37 */
  38
  39 #include "pgenheaders.h"
  40 #include "grammar.h"
  41 #include "node.h"
  42 #include "parsetok.h"
  43 #include "pgen.h"
  44
  45 int debugging;
  46
  47 /* Forward */
  48 grammar *getgrammar PROTO((char *filename));
  49 #ifdef THINK_C
  50 int main PROTO((int, char **));
  51 char *askfile PROTO((void));
  52 #endif
  53
  54 void
  55 goaway(sts)
  56         int sts;
  57 {
  58         exit(sts);
  59 }
  60
  61 int
  62 main(argc, argv)
  63         int argc;
  64         char **argv;
  65 {
  66         grammar *g;
  67         FILE *fp;
  68         char *filename;
  69
  70 #ifdef THINK_C
  71         filename = askfile();
  72 #else
  73         if (argc != 2) {
  74                 fprintf(stderr, "usage: %s grammar\n", argv[0]);
  75                 goaway(2);
  76         }
  77         filename = argv[1];
  78 #endif
  79         g = getgrammar(filename);
  80         fp = fopen("graminit.c", "w");
  81         if (fp == NULL) {
  82                 perror("graminit.c");
  83                 goaway(1);
  84         }
  85         printf("Writing graminit.c ...\n");
  86         printgrammar(g, fp);
  87         fclose(fp);
  88         fp = fopen("graminit.h", "w");
  89         if (fp == NULL) {
  90                 perror("graminit.h");
  91                 goaway(1);
  92         }
  93         printf("Writing graminit.h ...\n");
  94         printnonterminals(g, fp);
  95         fclose(fp);
  96         goaway(0);
  97 }
  98
  99 grammar *
 100 getgrammar(filename)
 101         char *filename;
 102 {
 103         FILE *fp;
 104         node *n;
 105         grammar *g0, *g;
 106         perrdetail err;
 107
 108         fp = fopen(filename, "r");
 109         if (fp == NULL) {
 110                 perror(filename);
 111                 goaway(1);
 112         }
 113         g0 = meta_grammar();
 114         n = parsefile(fp, filename, g0, g0->g_start,
 115                       (char *)NULL, (char *)NULL, &err);
 116         fclose(fp);
 117         if (n == NULL) {
 118                 fprintf(stderr, "Parsing error %d, line %d.\n",
 119                         err.error, err.lineno);
 120                 if (err.text != NULL) {
 121                         int i;
 122                         fprintf(stderr, "%s", err.text);
 123                         i = strlen(err.text);
 124                         if (i == 0 || err.text[i-1] != '\n')
 125                                 fprintf(stderr, "\n");
 126                         for (i = 0; i < err.offset; i++) {
 127                                 if (err.text[i] == '\t')
 128                                         putc('\t', stderr);
 129                                 else
 130                                         putc(' ', stderr);
 131                         }
 132                         fprintf(stderr, "^\n");
 133                         free(err.text);
 134                 }
 135                 goaway(1);
 136         }
 137         g = pgen(n);
 138         if (g == NULL) {
 139                 printf("Bad grammar.\n");
 140                 goaway(1);
 141         }
 142         return g;
 143 }
 144
 145 #ifdef THINK_C
 146 char *
 147 askfile()
 148 {
 149         char buf[256];
 150         static char name[256];
 151         printf("Input file name: ");
 152         if (fgets(buf, sizeof buf, stdin) == NULL) {
 153                 printf("EOF\n");
 154                 goaway(1);
 155         }
 156         /* XXX The (unsigned char *) case is needed by THINK C 3.0 */
 157         if (sscanf(/*(unsigned char *)*/buf, " %s ", name) != 1) {
 158                 printf("No file\n");
 159                 goaway(1);
 160         }
 161         return name;
 162 }
 163 #endif
 164
 165 void
 166 fatal(msg)
 167         char *msg;
 168 {
 169         fprintf(stderr, "pgen: FATAL ERROR: %s\n", msg);
 170         goaway(1);
 171 }
 172
 173 #ifdef macintosh
 174 /* ARGSUSED */
 175 int
 176 guesstabsize(path)
 177         char *path;
 178 {
 179         return 4;
 180 }
 181 #endif
 182
 183 /* No-nonsense my_readline() for tokenizer.c */
 184
 185 char *
 186 my_readline(prompt)
 187         char *prompt;
 188 {
 189         int n = 1000;
 190         char *p = malloc(n);
 191         char *q;
 192         if (p == NULL)
 193                 return NULL;
 194         fprintf(stderr, "%s", prompt);
 195         q = fgets(p, n, stdin);
 196         if (q == NULL) {
 197                 *p = '\0';
 198                 return p;
 199         }
 200         n = strlen(p);
 201         if (n > 0 && p[n-1] != '\n')
 202                 p[n-1] = '\n';
 203         return realloc(p, n+1);
 204 }