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61 lines
1.3 KiB
C
61 lines
1.3 KiB
C
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/* Grammar subroutines needed by parser */
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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 "token.h"
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/* Return the DFA for the given type */
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dfa *
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PyGrammar_FindDFA(grammar *g, int type)
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{
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dfa *d;
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#if 1
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/* Massive speed-up */
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d = &g->g_dfa[type - NT_OFFSET];
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assert(d->d_type == type);
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return d;
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#else
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/* Old, slow version */
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int i;
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for (i = g->g_ndfas, d = g->g_dfa; --i >= 0; d++) {
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if (d->d_type == type)
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return d;
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}
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assert(0);
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/* NOTREACHED */
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#endif
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}
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const char *
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PyGrammar_LabelRepr(label *lb)
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{
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static char buf[100];
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if (lb->lb_type == ENDMARKER)
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return "EMPTY";
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else if (ISNONTERMINAL(lb->lb_type)) {
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if (lb->lb_str == NULL) {
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PyOS_snprintf(buf, sizeof(buf), "NT%d", lb->lb_type);
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return buf;
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}
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else
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return lb->lb_str;
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}
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else if (lb->lb_type < N_TOKENS) {
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if (lb->lb_str == NULL)
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return _PyParser_TokenNames[lb->lb_type];
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else {
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PyOS_snprintf(buf, sizeof(buf), "%.32s(%.32s)",
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_PyParser_TokenNames[lb->lb_type], lb->lb_str);
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return buf;
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}
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}
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else {
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Py_FatalError("invalid label");
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return NULL;
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}
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}
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