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