aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/tools/python/src/Parser/grammar1.c
blob: 1f7d264be927e95080b02dfbf0b1417c98053fa9 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
/* Grammar subroutines needed by parser */

#include "Python.h"
#include "pgenheaders.h"
#include "grammar.h"
#include "token.h"

/* Return the DFA for the given type */

dfa *
PyGrammar_FindDFA(grammar *g, register int type)
{
    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;

    for (i = g->g_ndfas, d = g->g_dfa; --i >= 0; d++) {
        if (d->d_type == type)
            return d;
    }
    assert(0);
    /* NOTREACHED */
#endif
}

char *
PyGrammar_LabelRepr(label *lb)
{
    static char buf[100];

    if (lb->lb_type == ENDMARKER)
        return "EMPTY";
    else if (ISNONTERMINAL(lb->lb_type)) {
        if (lb->lb_str == NULL) {
            PyOS_snprintf(buf, sizeof(buf), "NT%d", lb->lb_type);
            return buf;
        }
        else
            return lb->lb_str;
    }
    else {
        if (lb->lb_str == NULL)
            return _PyParser_TokenNames[lb->lb_type];
        else {
            PyOS_snprintf(buf, sizeof(buf), "%.32s(%.32s)",
                _PyParser_TokenNames[lb->lb_type], lb->lb_str);
            return buf;
        }
    }
}