112 lines
1.7 KiB
C
112 lines
1.7 KiB
C
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/* Parser generator main program */
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#include <stdio.h>
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#include "PROTO.h"
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#include "grammar.h"
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#include "node.h"
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#include "parsetok.h"
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#include "pgen.h"
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int debugging;
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#ifdef THINK_C
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char *
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askfile()
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{
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char buf[256];
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static char name[256];
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printf("Input file name: ");
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if (fgets(buf, sizeof buf, stdin) == NULL) {
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printf("EOF\n");
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exit(1);
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}
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if (sscanf(buf, " %s ", name) != 1) {
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printf("No file\n");
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exit(1);
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}
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return name;
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}
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#endif
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grammar *
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getgrammar(filename)
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char *filename;
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{
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FILE *fp;
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node *n;
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grammar *g0, *g;
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fp = fopen(filename, "r");
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if (fp == NULL) {
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perror(filename);
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exit(1);
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}
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g0 = meta_grammar();
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n = NULL;
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parsefile(fp, g0, g0->g_start, (char *)NULL, (char *)NULL, &n);
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fclose(fp);
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if (n == NULL) {
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fprintf(stderr, "Parsing error.\n");
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exit(1);
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}
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g = pgen(n);
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if (g == NULL) {
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printf("Bad grammar.\n");
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exit(1);
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}
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return g;
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}
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main(argc, argv)
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int argc;
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char **argv;
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{
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grammar *g;
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node *n;
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FILE *fp;
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char *filename;
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#ifdef THINK_C
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filename = askfile();
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#else
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if (argc != 2) {
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fprintf(stderr, "usage: %s grammar\n", argv[0]);
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exit(2);
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}
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filename = argv[1];
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#endif
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g = getgrammar(filename);
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fp = fopen("graminit.c", "w");
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if (fp == NULL) {
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perror("graminit.c");
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exit(1);
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}
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printf("Writing graminit.c ...\n");
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printgrammar(g, fp);
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fclose(fp);
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fp = fopen("graminit.h", "w");
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if (fp == NULL) {
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perror("graminit.h");
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exit(1);
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}
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printf("Writing graminit.h ...\n");
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printnonterminals(g, fp);
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fclose(fp);
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exit(0);
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}
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void
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fatal(msg)
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char *msg;
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{
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fprintf(stderr, "pgen: FATAL ERROR: %s\n", msg);
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exit(1);
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}
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/* TO DO:
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- improve user interface
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- check for duplicate definitions of names (instead of fatal err)
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*/
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