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 or Corporation for National Research Initiatives or
  13 CNRI not be used in advertising or publicity pertaining to
  14 distribution of the software without specific, written prior
  15 permission.
  16
  17 While CWI is the initial source for this software, a modified version
  18 is made available by the Corporation for National Research Initiatives
  19 (CNRI) at the Internet address ftp://ftp.python.org.
  20
  21 STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
  22 REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
  23 MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
  24 CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
  25 DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  26 PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  27 TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  28 PERFORMANCE OF THIS SOFTWARE.
  29
  30 ******************************************************************/
  31
  32 /* Parser generator main program */
  33
  34 /* This expects a filename containing the grammar as argv[1] (UNIX)
  35    or asks the console for such a file name (THINK C).
  36    It writes its output on two files in the current directory:
  37    - "graminit.c" gets the grammar as a bunch of initialized data
  38    - "graminit.h" gets the grammar's non-terminals as #defines.
  39    Error messages and status info during the generation process are
  40    written to stdout, or sometimes to stderr. */
  41
  42 /* XXX TO DO:
  43    - check for duplicate definitions of names (instead of fatal err)
  44 */
  45
  46 #include "pgenheaders.h"
  47 #include "grammar.h"
  48 #include "node.h"
  49 #include "parsetok.h"
  50 #include "pgen.h"
  51
  52 int Py_DebugFlag;
  53 int Py_VerboseFlag;
  54
  55 /* Forward */
  56 grammar *getgrammar Py_PROTO((char *filename));
  57 #ifdef THINK_C
  58 int main Py_PROTO((int, char **));
  59 char *askfile Py_PROTO((void));
  60 #endif
  61
  62 void
  63 Py_Exit(sts)
  64         int sts;
  65 {
  66         exit(sts);
  67 }
  68
  69 int
  70 main(argc, argv)
  71         int argc;
  72         char **argv;
  73 {
  74         grammar *g;
  75         FILE *fp;
  76         char *filename;
  77
  78 #ifdef THINK_C
  79         filename = askfile();
  80 #else
  81         if (argc != 2) {
  82                 fprintf(stderr, "usage: %s grammar\n", argv[0]);
  83                 Py_Exit(2);
  84         }
  85         filename = argv[1];
  86 #endif
  87         g = getgrammar(filename);
  88         fp = fopen("graminit.c", "w");
  89         if (fp == NULL) {
  90                 perror("graminit.c");
  91                 Py_Exit(1);
  92         }
  93         printf("Writing graminit.c ...\n");
  94         printgrammar(g, fp);
  95         fclose(fp);
  96         fp = fopen("graminit.h", "w");
  97         if (fp == NULL) {
  98                 perror("graminit.h");
  99                 Py_Exit(1);
 100         }
 101         printf("Writing graminit.h ...\n");
 102         printnonterminals(g, fp);
 103         fclose(fp);
 104         Py_Exit(0);
 105         return 0; /* Make gcc -Wall happy */
 106 }
 107
 108 grammar *
 109 getgrammar(filename)
 110         char *filename;
 111 {
 112         FILE *fp;
 113         node *n;
 114         grammar *g0, *g;
 115         perrdetail err;
 116
 117         fp = fopen(filename, "r");
 118         if (fp == NULL) {
 119                 perror(filename);
 120                 Py_Exit(1);
 121         }
 122         g0 = meta_grammar();
 123         n = PyParser_ParseFile(fp, filename, g0, g0->g_start,
 124                       (char *)NULL, (char *)NULL, &err);
 125         fclose(fp);
 126         if (n == NULL) {
 127                 fprintf(stderr, "Parsing error %d, line %d.\n",
 128                         err.error, err.lineno);
 129                 if (err.text != NULL) {
 130                         int i;
 131                         fprintf(stderr, "%s", err.text);
 132                         i = strlen(err.text);
 133                         if (i == 0 || err.text[i-1] != '\n')
 134                                 fprintf(stderr, "\n");
 135                         for (i = 0; i < err.offset; i++) {
 136                                 if (err.text[i] == '\t')
 137                                         putc('\t', stderr);
 138                                 else
 139                                         putc(' ', stderr);
 140                         }
 141                         fprintf(stderr, "^\n");
 142                         free(err.text);
 143                 }
 144                 Py_Exit(1);
 145         }
 146         g = pgen(n);
 147         if (g == NULL) {
 148                 printf("Bad grammar.\n");
 149                 Py_Exit(1);
 150         }
 151         return g;
 152 }
 153
 154 #ifdef THINK_C
 155 char *
 156 askfile()
 157 {
 158         char buf[256];
 159         static char name[256];
 160         printf("Input file name: ");
 161         if (fgets(buf, sizeof buf, stdin) == NULL) {
 162                 printf("EOF\n");
 163                 Py_Exit(1);
 164         }
 165         /* XXX The (unsigned char *) case is needed by THINK C 3.0 */
 166         if (sscanf(/*(unsigned char *)*/buf, " %s ", name) != 1) {
 167                 printf("No file\n");
 168                 Py_Exit(1);
 169         }
 170         return name;
 171 }
 172 #endif
 173
 174 void
 175 Py_FatalError(msg)
 176         char *msg;
 177 {
 178         fprintf(stderr, "pgen: FATAL ERROR: %s\n", msg);
 179         Py_Exit(1);
 180 }
 181
 182 #ifdef macintosh
 183 /* ARGSUSED */
 184 int
 185 guesstabsize(path)
 186         char *path;
 187 {
 188         return 4;
 189 }
 190 #endif
 191
 192 /* No-nonsense my_readline() for tokenizer.c */
 193
 194 char *
 195 PyOS_Readline(prompt)
 196         char *prompt;
 197 {
 198         int n = 1000;
 199         char *p = malloc(n);
 200         char *q;
 201         if (p == NULL)
 202                 return NULL;
 203         fprintf(stderr, "%s", prompt);
 204         q = fgets(p, n, stdin);
 205         if (q == NULL) {
 206                 *p = '\0';
 207                 return p;
 208         }
 209         n = strlen(p);
 210         if (n > 0 && p[n-1] != '\n')
 211                 p[n-1] = '\n';
 212         return realloc(p, n+1);
 213 }