/* Parser generator main program */

/* 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. */

/* XXX TO DO:
 - check for duplicate definitions of names (instead of fatal err)
*/

#define PGEN

#include "Python.h"
#include "internal/mem.h"
#include "internal/pystate.h"
#include "pgenheaders.h"
#include "grammar.h"
#include "node.h"
#include "parsetok.h"
#include "pgen.h"

int Py_DebugFlag;
int Py_VerboseFlag;
int Py_IgnoreEnvironmentFlag;
_PyRuntimeState _PyRuntime = _PyRuntimeState_INIT;

/* Forward */
grammar *getgrammar(const char *filename);

void
Py_Exit(int sts)
{
 exit(sts);
}

/* Needed by obmalloc.c */
int PyGILState_Check(void)
{ return 1; }

void _PyMem_DumpTraceback(int fd, const void *ptr)
{}

int
main(int argc, char **argv)
{
 grammar *g;
 FILE *fp;
 char *filename, *graminit_h, *graminit_c;

 if (argc != 4) {
 fprintf(stderr,
 "usage: %s grammar graminit.h graminit.c\n", argv[0]);
 Py_Exit(2);
 }
 filename = argv[1];
 graminit_h = argv[2];
 graminit_c = argv[3];
 g = getgrammar(filename);
 fp = fopen(graminit_c, "w");
 if (fp == NULL) {
 perror(graminit_c);
 Py_Exit(1);
 }
 if (Py_DebugFlag)
 printf("Writing %s ...\n", graminit_c);
 printgrammar(g, fp);
 fclose(fp);
 fp = fopen(graminit_h, "w");
 if (fp == NULL) {
 perror(graminit_h);
 Py_Exit(1);
 }
 if (Py_DebugFlag)
 printf("Writing %s ...\n", graminit_h);
 printnonterminals(g, fp);
 fclose(fp);
 freegrammar(g);
 Py_Exit(0);
 return 0; /* Make gcc -Wall happy */
}

grammar *
getgrammar(const char *filename)
{
 FILE *fp;
 node *n;
 grammar *g0, *g;
 perrdetail err;

 fp = fopen(filename, "r");
 if (fp == NULL) {
 perror(filename);
 Py_Exit(1);
 }
 g0 = meta_grammar();
 n = PyParser_ParseFile(fp, filename, g0, g0->g_start,
 (char *)NULL, (char *)NULL, &err);
 fclose(fp);
 if (n == NULL) {
 fprintf(stderr, "Parsing error %d, line %d.\n",
 err.error, err.lineno);
 if (err.text != NULL) {
 size_t len;
 int i;
 fprintf(stderr, "%s", err.text);
 len = strlen(err.text);
 if (len == 0 || err.text[len-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");
 PyObject_FREE(err.text);
 }
 Py_Exit(1);
 }
 g = pgen(n);
 PyNode_Free(n);
 if (g == NULL) {
 printf("Bad grammar.\n");
 Py_Exit(1);
 }
 return g;
}

/* Can't happen in pgen */
PyObject*
PyErr_Occurred()
{
 return 0;
}

void
Py_FatalError(const char *msg)
{
 fprintf(stderr, "pgen: FATAL ERROR: %s\n", msg);
 Py_Exit(1);
}

/* No-nonsense my_readline() for tokenizer.c */

char *
PyOS_Readline(FILE *sys_stdin, FILE *sys_stdout, const char *prompt)
{
 size_t n = 1000;
 char *p = (char *)PyMem_MALLOC(n);
 char *q;
 if (p == NULL)
 return NULL;
 fprintf(stderr, "%s", prompt);
 q = fgets(p, n, sys_stdin);
 if (q == NULL) {
 *p = '0円';
 return p;
 }
 n = strlen(p);
 if (n > 0 && p[n-1] != '\n')
 p[n-1] = '\n';
 return (char *)PyMem_REALLOC(p, n+1);
}

/* No-nonsense fgets */
char *
Py_UniversalNewlineFgets(char *buf, int n, FILE *stream, PyObject *fobj)
{
 return fgets(buf, n, stream);
}


#include <stdarg.h>

void
PySys_WriteStderr(const char *format, ...)
{
 va_list va;

 va_start(va, format);
 vfprintf(stderr, format, va);
 va_end(va);
}