251 lines
6.7 KiB
C
251 lines
6.7 KiB
C
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/* Grammar implementation */
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#include "Python.h"
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#include "pgenheaders.h"
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#include <ctype.h>
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#include "token.h"
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#include "grammar.h"
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extern int Py_DebugFlag;
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grammar *
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newgrammar(int start)
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{
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grammar *g;
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g = (grammar *)PyObject_MALLOC(sizeof(grammar));
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if (g == NULL)
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Py_FatalError("no mem for new grammar");
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g->g_ndfas = 0;
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g->g_dfa = NULL;
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g->g_start = start;
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g->g_ll.ll_nlabels = 0;
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g->g_ll.ll_label = NULL;
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g->g_accel = 0;
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return g;
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}
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dfa *
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adddfa(grammar *g, int type, const char *name)
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{
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dfa *d;
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g->g_dfa = (dfa *)PyObject_REALLOC(g->g_dfa,
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sizeof(dfa) * (g->g_ndfas + 1));
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if (g->g_dfa == NULL)
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Py_FatalError("no mem to resize dfa in adddfa");
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d = &g->g_dfa[g->g_ndfas++];
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d->d_type = type;
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d->d_name = strdup(name);
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d->d_nstates = 0;
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d->d_state = NULL;
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d->d_initial = -1;
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d->d_first = NULL;
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return d; /* Only use while fresh! */
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}
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int
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addstate(dfa *d)
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{
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state *s;
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d->d_state = (state *)PyObject_REALLOC(d->d_state,
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sizeof(state) * (d->d_nstates + 1));
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if (d->d_state == NULL)
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Py_FatalError("no mem to resize state in addstate");
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s = &d->d_state[d->d_nstates++];
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s->s_narcs = 0;
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s->s_arc = NULL;
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s->s_lower = 0;
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s->s_upper = 0;
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s->s_accel = NULL;
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s->s_accept = 0;
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return s - d->d_state;
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}
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void
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addarc(dfa *d, int from, int to, int lbl)
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{
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state *s;
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arc *a;
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assert(0 <= from && from < d->d_nstates);
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assert(0 <= to && to < d->d_nstates);
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s = &d->d_state[from];
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s->s_arc = (arc *)PyObject_REALLOC(s->s_arc, sizeof(arc) * (s->s_narcs + 1));
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if (s->s_arc == NULL)
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Py_FatalError("no mem to resize arc list in addarc");
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a = &s->s_arc[s->s_narcs++];
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a->a_lbl = lbl;
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a->a_arrow = to;
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}
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int
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addlabel(labellist *ll, int type, const char *str)
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{
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int i;
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label *lb;
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for (i = 0; i < ll->ll_nlabels; i++) {
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if (ll->ll_label[i].lb_type == type &&
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strcmp(ll->ll_label[i].lb_str, str) == 0)
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return i;
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}
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ll->ll_label = (label *)PyObject_REALLOC(ll->ll_label,
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sizeof(label) * (ll->ll_nlabels + 1));
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if (ll->ll_label == NULL)
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Py_FatalError("no mem to resize labellist in addlabel");
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lb = &ll->ll_label[ll->ll_nlabels++];
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lb->lb_type = type;
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lb->lb_str = strdup(str);
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if (Py_DebugFlag)
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printf("Label @ %8p, %d: %s\n", ll, ll->ll_nlabels,
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PyGrammar_LabelRepr(lb));
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return lb - ll->ll_label;
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}
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/* Same, but rather dies than adds */
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int
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findlabel(labellist *ll, int type, const char *str)
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{
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int i;
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for (i = 0; i < ll->ll_nlabels; i++) {
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if (ll->ll_label[i].lb_type == type /*&&
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strcmp(ll->ll_label[i].lb_str, str) == 0*/)
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return i;
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}
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fprintf(stderr, "Label %d/'%s' not found\n", type, str);
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Py_FatalError("grammar.c:findlabel()");
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return 0; /* Make gcc -Wall happy */
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}
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/* Forward */
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static void translabel(grammar *, label *);
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void
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translatelabels(grammar *g)
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{
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int i;
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#ifdef Py_DEBUG
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printf("Translating labels ...\n");
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#endif
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/* Don't translate EMPTY */
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for (i = EMPTY+1; i < g->g_ll.ll_nlabels; i++)
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translabel(g, &g->g_ll.ll_label[i]);
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}
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static void
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translabel(grammar *g, label *lb)
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{
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int i;
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if (Py_DebugFlag)
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printf("Translating label %s ...\n", PyGrammar_LabelRepr(lb));
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if (lb->lb_type == NAME) {
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for (i = 0; i < g->g_ndfas; i++) {
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if (strcmp(lb->lb_str, g->g_dfa[i].d_name) == 0) {
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if (Py_DebugFlag)
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printf(
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"Label %s is non-terminal %d.\n",
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lb->lb_str,
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g->g_dfa[i].d_type);
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lb->lb_type = g->g_dfa[i].d_type;
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free(lb->lb_str);
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lb->lb_str = NULL;
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return;
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}
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}
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for (i = 0; i < (int)N_TOKENS; i++) {
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if (strcmp(lb->lb_str, _PyParser_TokenNames[i]) == 0) {
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if (Py_DebugFlag)
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printf("Label %s is terminal %d.\n",
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lb->lb_str, i);
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lb->lb_type = i;
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free(lb->lb_str);
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lb->lb_str = NULL;
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return;
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}
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}
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printf("Can't translate NAME label '%s'\n", lb->lb_str);
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return;
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}
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if (lb->lb_type == STRING) {
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if (isalpha(Py_CHARMASK(lb->lb_str[1])) ||
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lb->lb_str[1] == '_') {
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char *p;
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char *src;
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char *dest;
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size_t name_len;
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if (Py_DebugFlag)
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printf("Label %s is a keyword\n", lb->lb_str);
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lb->lb_type = NAME;
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src = lb->lb_str + 1;
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p = strchr(src, '\'');
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if (p)
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name_len = p - src;
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else
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name_len = strlen(src);
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dest = (char *)malloc(name_len + 1);
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if (!dest) {
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printf("Can't alloc dest '%s'\n", src);
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return;
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}
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strncpy(dest, src, name_len);
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dest[name_len] = '\0';
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free(lb->lb_str);
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lb->lb_str = dest;
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}
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else if (lb->lb_str[2] == lb->lb_str[0]) {
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int type = (int) PyToken_OneChar(lb->lb_str[1]);
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if (type != OP) {
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lb->lb_type = type;
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free(lb->lb_str);
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lb->lb_str = NULL;
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}
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else
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printf("Unknown OP label %s\n",
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lb->lb_str);
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}
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else if (lb->lb_str[2] && lb->lb_str[3] == lb->lb_str[0]) {
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int type = (int) PyToken_TwoChars(lb->lb_str[1],
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lb->lb_str[2]);
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if (type != OP) {
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lb->lb_type = type;
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free(lb->lb_str);
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lb->lb_str = NULL;
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}
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else
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printf("Unknown OP label %s\n",
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lb->lb_str);
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}
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else if (lb->lb_str[2] && lb->lb_str[3] && lb->lb_str[4] == lb->lb_str[0]) {
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int type = (int) PyToken_ThreeChars(lb->lb_str[1],
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lb->lb_str[2],
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lb->lb_str[3]);
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if (type != OP) {
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lb->lb_type = type;
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free(lb->lb_str);
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lb->lb_str = NULL;
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}
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else
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printf("Unknown OP label %s\n",
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lb->lb_str);
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}
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else
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printf("Can't translate STRING label %s\n",
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lb->lb_str);
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}
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else
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printf("Can't translate label '%s'\n",
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PyGrammar_LabelRepr(lb));
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}
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