cpython/Parser/grammar1.c

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