2 /* Parser generator main program */
4 /* This expects a filename containing the grammar as argv[1] (UNIX)
5 or asks the console for such a file name (THINK C).
6 It writes its output on two files in the current directory:
7 - "graminit.c" gets the grammar as a bunch of initialized data
8 - "graminit.h" gets the grammar's non-terminals as #defines.
9 Error messages and status info during the generation process are
10 written to stdout, or sometimes to stderr. */
13 - check for duplicate definitions of names (instead of fatal err)
17 #include "pgenheaders.h"
25 int Py_IgnoreEnvironmentFlag;
28 grammar *getgrammar(char *filename);
37 main(int argc, char **argv)
41 char *filename, *graminit_h, *graminit_c;
45 "usage: %s grammar graminit.h graminit.c\n", argv[0]);
51 g = getgrammar(filename);
52 fp = fopen(graminit_c, "w");
58 printf("Writing %s ...\n", graminit_c);
61 fp = fopen(graminit_h, "w");
67 printf("Writing %s ...\n", graminit_h);
68 printnonterminals(g, fp);
71 return 0; /* Make gcc -Wall happy */
75 getgrammar(char *filename)
82 fp = fopen(filename, "r");
88 n = PyParser_ParseFile(fp, filename, g0, g0->g_start,
89 (char *)NULL, (char *)NULL, &err);
92 fprintf(stderr, "Parsing error %d, line %d.\n",
93 err.error, err.lineno);
94 if (err.text != NULL) {
96 fprintf(stderr, "%s", err.text);
98 if (i == 0 || err.text[i-1] != '\n')
99 fprintf(stderr, "\n");
100 for (i = 0; i < err.offset; i++) {
101 if (err.text[i] == '\t')
106 fprintf(stderr, "^\n");
107 PyObject_FREE(err.text);
113 printf("Bad grammar.\n");
119 /* Can't happen in pgen */
127 Py_FatalError(const char *msg)
129 fprintf(stderr, "pgen: FATAL ERROR: %s\n", msg);
133 /* No-nonsense my_readline() for tokenizer.c */
136 PyOS_Readline(FILE *sys_stdin, FILE *sys_stdout, char *prompt)
139 char *p = (char *)PyMem_MALLOC(n);
143 fprintf(stderr, "%s", prompt);
144 q = fgets(p, n, sys_stdin);
150 if (n > 0 && p[n-1] != '\n')
152 return (char *)PyMem_REALLOC(p, n+1);
155 /* No-nonsense fgets */
157 Py_UniversalNewlineFgets(char *buf, int n, FILE *stream, PyObject *fobj)
159 return fgets(buf, n, stream);
166 PySys_WriteStderr(const char *format, ...)
170 va_start(va, format);
171 vfprintf(stderr, format, va);