symbian-qemu-0.9.1-12/python-2.6.1/Parser/pgenmain.c
author martin.trojer@nokia.com
Fri, 31 Jul 2009 15:01:17 +0100
changeset 1 2fb8b9db1c86
permissions -rw-r--r--
Initial QEMU (symbian-qemu-0.9.1-12) import
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/* Parser generator main program */
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/* This expects a filename containing the grammar as argv[1] (UNIX)
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   or asks the console for such a file name (THINK C).
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   It writes its output on two files in the current directory:
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   - "graminit.c" gets the grammar as a bunch of initialized data
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   - "graminit.h" gets the grammar's non-terminals as #defines.
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   Error messages and status info during the generation process are
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   written to stdout, or sometimes to stderr. */
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/* XXX TO DO:
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   - check for duplicate definitions of names (instead of fatal err)
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*/
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#include "Python.h"
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#include "pgenheaders.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 Py_DebugFlag;
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int Py_VerboseFlag;
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int Py_IgnoreEnvironmentFlag;
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/* Forward */
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grammar *getgrammar(char *filename);
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void
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Py_Exit(int sts)
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{
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	exit(sts);
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}
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int
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main(int argc, char **argv)
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{
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	grammar *g;
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	FILE *fp;
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	char *filename, *graminit_h, *graminit_c;
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	if (argc != 4) {
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		fprintf(stderr,
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			"usage: %s grammar graminit.h graminit.c\n", argv[0]);
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		Py_Exit(2);
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	}
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	filename = argv[1];
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	graminit_h = argv[2];
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	graminit_c = argv[3];
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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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		Py_Exit(1);
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	}
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	if (Py_DebugFlag)
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		printf("Writing %s ...\n", graminit_c);
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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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		Py_Exit(1);
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	}
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	if (Py_DebugFlag)
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		printf("Writing %s ...\n", graminit_h);
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	printnonterminals(g, fp);
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	fclose(fp);
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	Py_Exit(0);
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	return 0; /* Make gcc -Wall happy */
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}
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grammar *
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getgrammar(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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	perrdetail err;
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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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		Py_Exit(1);
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	}
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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);
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	if (n == NULL) {
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		fprintf(stderr, "Parsing error %d, line %d.\n",
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			err.error, err.lineno);
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		if (err.text != NULL) {
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			size_t i;
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			fprintf(stderr, "%s", err.text);
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			i = strlen(err.text);
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			if (i == 0 || err.text[i-1] != '\n')
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				fprintf(stderr, "\n");
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			for (i = 0; i < err.offset; i++) {
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				if (err.text[i] == '\t')
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					putc('\t', stderr);
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				else
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					putc(' ', stderr);
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			}
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			fprintf(stderr, "^\n");
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			PyObject_FREE(err.text);
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		}
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		Py_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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		Py_Exit(1);
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	}
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	return g;
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}
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/* Can't happen in pgen */
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PyObject*
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PyErr_Occurred()
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{
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	return 0;
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}
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void
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Py_FatalError(const char *msg)
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{
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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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/* No-nonsense my_readline() for tokenizer.c */
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char *
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PyOS_Readline(FILE *sys_stdin, FILE *sys_stdout, char *prompt)
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{
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	size_t n = 1000;
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	char *p = (char *)PyMem_MALLOC(n);
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	char *q;
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	if (p == NULL)
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		return NULL;
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	fprintf(stderr, "%s", prompt);
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	q = fgets(p, n, sys_stdin);
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	if (q == NULL) {
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		*p = '\0';
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		return p;
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	}
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	n = strlen(p);
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	if (n > 0 && p[n-1] != '\n')
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		p[n-1] = '\n';
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	return (char *)PyMem_REALLOC(p, n+1);
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}
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/* No-nonsense fgets */
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char *
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Py_UniversalNewlineFgets(char *buf, int n, FILE *stream, PyObject *fobj)
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{
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	return fgets(buf, n, stream);
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}
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#include <stdarg.h>
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void
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PySys_WriteStderr(const char *format, ...)
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{
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	va_list va;
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	va_start(va, format);
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	vfprintf(stderr, format, va);
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	va_end(va);
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}