/* Grammar implementation */

#include "Python.h"

#include "pgenheaders.h"

#include <ctype.h>

#include "token.h"

#include "grammar.h"

#ifdef RISCOS

#include <unixlib.h>

#endif

extern int Py_DebugFlag;

grammar *

newgrammar(int start)

{

	grammar *g;

	g = (grammar *)PyObject_MALLOC(sizeof(grammar));

	if (g == NULL)

		Py_FatalError("no mem for new grammar");

	g->g_ndfas = 0;

	g->g_dfa = NULL;

	g->g_start = start;

	g->g_ll.ll_nlabels = 0;

	g->g_ll.ll_label = NULL;

	g->g_accel = 0;

	return g;

}

dfa *

adddfa(grammar *g, int type, char *name)

{

	dfa *d;

	g->g_dfa = (dfa *)PyObject_REALLOC(g->g_dfa, 

                                            sizeof(dfa) * (g->g_ndfas + 1));

	if (g->g_dfa == NULL)

		Py_FatalError("no mem to resize dfa in adddfa");

	d = &g->g_dfa[g->g_ndfas++];

	d->d_type = type;

	d->d_name = strdup(name);

	d->d_nstates = 0;

	d->d_state = NULL;

	d->d_initial = -1;

	d->d_first = NULL;

	return d; /* Only use while fresh! */

}

int

addstate(dfa *d)

{

	state *s;

	d->d_state = (state *)PyObject_REALLOC(d->d_state,

				      sizeof(state) * (d->d_nstates + 1));

	if (d->d_state == NULL)

		Py_FatalError("no mem to resize state in addstate");

	s = &d->d_state[d->d_nstates++];

	s->s_narcs = 0;

	s->s_arc = NULL;

	s->s_lower = 0;

	s->s_upper = 0;

	s->s_accel = NULL;

	s->s_accept = 0;

	return s - d->d_state;

}

void

addarc(dfa *d, int from, int to, int lbl)

{

	state *s;

	arc *a;

	assert(0 <= from && from < d->d_nstates);

	assert(0 <= to && to < d->d_nstates);

	s = &d->d_state[from];

	s->s_arc = (arc *)PyObject_REALLOC(s->s_arc, sizeof(arc) * (s->s_narcs + 1));

	if (s->s_arc == NULL)

		Py_FatalError("no mem to resize arc list in addarc");

	a = &s->s_arc[s->s_narcs++];

	a->a_lbl = lbl;

	a->a_arrow = to;

}

int

addlabel(labellist *ll, int type, char *str)

{

	int i;

	label *lb;

	for (i = 0; i < ll->ll_nlabels; i++) {

		if (ll->ll_label[i].lb_type == type &&

			strcmp(ll->ll_label[i].lb_str, str) == 0)

			return i;

	}

	ll->ll_label = (label *)PyObject_REALLOC(ll->ll_label,

					sizeof(label) * (ll->ll_nlabels + 1));

	if (ll->ll_label == NULL)

		Py_FatalError("no mem to resize labellist in addlabel");

	lb = &ll->ll_label[ll->ll_nlabels++];

	lb->lb_type = type;

	lb->lb_str = strdup(str);

	if (Py_DebugFlag)

		printf("Label @ %8p, %d: %s\n", ll, ll->ll_nlabels,

		       PyGrammar_LabelRepr(lb));

	return lb - ll->ll_label;

}

/* Same, but rather dies than adds */

int

findlabel(labellist *ll, int type, char *str)

{

	int i;

	for (i = 0; i < ll->ll_nlabels; i++) {

		if (ll->ll_label[i].lb_type == type /*&&

			strcmp(ll->ll_label[i].lb_str, str) == 0*/)

			return i;

	}

	fprintf(stderr, "Label %d/'%s' not found\n", type, str);

	Py_FatalError("grammar.c:findlabel()");

	return 0; /* Make gcc -Wall happy */

}

/* Forward */

static void translabel(grammar *, label *);

void

translatelabels(grammar *g)

{

	int i;

#ifdef Py_DEBUG

	printf("Translating labels ...\n");

#endif

	/* Don't translate EMPTY */

	for (i = EMPTY+1; i < g->g_ll.ll_nlabels; i++)

		translabel(g, &g->g_ll.ll_label[i]);

}

static void

translabel(grammar *g, label *lb)

{

	int i;

	if (Py_DebugFlag)

		printf("Translating label %s ...\n", PyGrammar_LabelRepr(lb));

	if (lb->lb_type == NAME) {

		for (i = 0; i < g->g_ndfas; i++) {

			if (strcmp(lb->lb_str, g->g_dfa[i].d_name) == 0) {

				if (Py_DebugFlag)

					printf(

					    "Label %s is non-terminal %d.\n",

					    lb->lb_str,

					    g->g_dfa[i].d_type);

				lb->lb_type = g->g_dfa[i].d_type;

				free(lb->lb_str);

				lb->lb_str = NULL;

				return;

			}

		}

		for (i = 0; i < (int)N_TOKENS; i++) {

			if (strcmp(lb->lb_str, _PyParser_TokenNames[i]) == 0) {

				if (Py_DebugFlag)

					printf("Label %s is terminal %d.\n",

						lb->lb_str, i);

				lb->lb_type = i;

				free(lb->lb_str);

				lb->lb_str = NULL;

				return;

			}

		}

		printf("Can't translate NAME label '%s'\n", lb->lb_str);

		return;

	}

	if (lb->lb_type == STRING) {

		if (isalpha(Py_CHARMASK(lb->lb_str[1])) ||

		    lb->lb_str[1] == '_') {

			char *p;

			char *src;

			char *dest;

			size_t name_len;

			if (Py_DebugFlag)

				printf("Label %s is a keyword\n", lb->lb_str);

			lb->lb_type = NAME;

			src = lb->lb_str + 1;

			p = strchr(src, '\'');

			if (p)

				name_len = p - src;

			else

				name_len = strlen(src);

			dest = (char *)malloc(name_len + 1);

			if (!dest) {

				printf("Can't alloc dest '%s'\n", src);

				return;

			}

			strncpy(dest, src, name_len);

			dest[name_len] = '\0';

			free(lb->lb_str);

			lb->lb_str = dest;

		}

		else if (lb->lb_str[2] == lb->lb_str[0]) {

			int type = (int) PyToken_OneChar(lb->lb_str[1]);

			if (type != OP) {

				lb->lb_type = type;

				free(lb->lb_str);

				lb->lb_str = NULL;

			}

			else

				printf("Unknown OP label %s\n",

					lb->lb_str);

		}

		else if (lb->lb_str[2] && lb->lb_str[3] == lb->lb_str[0]) {

			int type = (int) PyToken_TwoChars(lb->lb_str[1],

						   lb->lb_str[2]);

			if (type != OP) {

				lb->lb_type = type;

				free(lb->lb_str);

				lb->lb_str = NULL;

			}

			else

				printf("Unknown OP label %s\n",

					lb->lb_str);

		}

		else if (lb->lb_str[2] && lb->lb_str[3] && lb->lb_str[4] == lb->lb_str[0]) {

			int type = (int) PyToken_ThreeChars(lb->lb_str[1],

							    lb->lb_str[2],

							    lb->lb_str[3]);

			if (type != OP) {

				lb->lb_type = type;

				free(lb->lb_str);

				lb->lb_str = NULL;

			}

			else

				printf("Unknown OP label %s\n",

					lb->lb_str);

		}

		else

			printf("Can't translate STRING label %s\n",

				lb->lb_str);

	}

	else

		printf("Can't translate label '%s'\n",

		       PyGrammar_LabelRepr(lb));

}