cpython/Parser/pgenmain.c

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C
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/* Parser generator main program */
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/* This expects a filename containing the grammar as argv[1] (UNIX)
or asks the console for such a file name (THINK C).
It writes its output on two files in the current directory:
- "graminit.c" gets the grammar as a bunch of initialized data
- "graminit.h" gets the grammar's non-terminals as #defines.
Error messages and status info during the generation process are
written to stdout, or sometimes to stderr. */
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/* XXX TO DO:
- check for duplicate definitions of names (instead of fatal err)
*/
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#include "pgenheaders.h"
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#include "grammar.h"
#include "node.h"
#include "parsetok.h"
#include "pgen.h"
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int Py_DebugFlag;
int Py_VerboseFlag;
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/* Forward */
grammar *getgrammar(char *filename);
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#ifdef THINK_C
int main(int, char **);
char *askfile(void);
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#endif
void
Py_Exit(int sts)
{
exit(sts);
}
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int
main(int argc, char **argv)
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{
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grammar *g;
FILE *fp;
char *filename, *graminit_h, *graminit_c;
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#ifdef THINK_C
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filename = askfile();
graminit_h = askfile();
graminit_c = askfile();
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#else
if (argc != 4) {
fprintf(stderr,
"usage: %s grammar graminit.h graminit.c\n", argv[0]);
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Py_Exit(2);
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}
filename = argv[1];
graminit_h = argv[2];
graminit_c = argv[3];
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#endif
g = getgrammar(filename);
fp = fopen(graminit_c, "w");
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if (fp == NULL) {
perror(graminit_c);
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Py_Exit(1);
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}
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if (Py_DebugFlag)
printf("Writing %s ...\n", graminit_c);
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printgrammar(g, fp);
fclose(fp);
fp = fopen(graminit_h, "w");
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if (fp == NULL) {
perror(graminit_h);
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Py_Exit(1);
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}
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if (Py_DebugFlag)
printf("Writing %s ...\n", graminit_h);
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printnonterminals(g, fp);
fclose(fp);
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Py_Exit(0);
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return 0; /* Make gcc -Wall happy */
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}
grammar *
getgrammar(char *filename)
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{
FILE *fp;
node *n;
grammar *g0, *g;
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perrdetail err;
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fp = fopen(filename, "r");
if (fp == NULL) {
perror(filename);
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Py_Exit(1);
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}
g0 = meta_grammar();
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n = PyParser_ParseFile(fp, filename, g0, g0->g_start,
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(char *)NULL, (char *)NULL, &err);
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fclose(fp);
if (n == NULL) {
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fprintf(stderr, "Parsing error %d, line %d.\n",
err.error, err.lineno);
if (err.text != NULL) {
size_t i;
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fprintf(stderr, "%s", err.text);
i = strlen(err.text);
if (i == 0 || err.text[i-1] != '\n')
fprintf(stderr, "\n");
for (i = 0; i < err.offset; i++) {
if (err.text[i] == '\t')
putc('\t', stderr);
else
putc(' ', stderr);
}
fprintf(stderr, "^\n");
PyMem_DEL(err.text);
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}
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Py_Exit(1);
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}
g = pgen(n);
if (g == NULL) {
printf("Bad grammar.\n");
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Py_Exit(1);
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}
return g;
}
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#ifdef THINK_C
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char *
askfile(void)
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{
char buf[256];
static char name[256];
printf("Input file name: ");
if (fgets(buf, sizeof buf, stdin) == NULL) {
printf("EOF\n");
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Py_Exit(1);
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}
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/* XXX The (unsigned char *) case is needed by THINK C 3.0 */
if (sscanf(/*(unsigned char *)*/buf, " %s ", name) != 1) {
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printf("No file\n");
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Py_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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void
Py_FatalError(char *msg)
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{
fprintf(stderr, "pgen: FATAL ERROR: %s\n", msg);
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Py_Exit(1);
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}
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#ifdef macintosh
/* ARGSUSED */
int
guesstabsize(char *path)
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{
return 4;
}
#endif
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/* No-nonsense my_readline() for tokenizer.c */
char *
PyOS_Readline(char *prompt)
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{
size_t n = 1000;
char *p = PyMem_MALLOC(n);
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char *q;
if (p == NULL)
return NULL;
fprintf(stderr, "%s", prompt);
q = fgets(p, n, stdin);
if (q == NULL) {
*p = '\0';
return p;
}
n = strlen(p);
if (n > 0 && p[n-1] != '\n')
p[n-1] = '\n';
return PyMem_REALLOC(p, n+1);
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}
#include <stdarg.h>
void
PySys_WriteStderr(const char *format, ...)
{
va_list va;
va_start(va, format);
vfprintf(stderr, format, va);
va_end(va);
}