cpython/Parser/printgrammar.c

/* Print a bunch of C initializers that represent a grammar */

#define PGEN

#include "pgenheaders.h"
#include "grammar.h"

/* Forward */
static void printarcs(int, dfa *, FILE *);
static void printstates(grammar *, FILE *);
static void printdfas(grammar *, FILE *);
static void printlabels(grammar *, FILE *);

void
printgrammar(grammar *g, FILE *fp)
{
    fprintf(fp, "/* Generated by Parser/pgen */\n\n");
    fprintf(fp, "#include \"pgenheaders.h\"\n");
    fprintf(fp, "#include \"grammar.h\"\n");
    fprintf(fp, "grammar _PyParser_Grammar;\n");
    printdfas(g, fp);
    printlabels(g, fp);
    fprintf(fp, "grammar _PyParser_Grammar = {\n");
    fprintf(fp, "    %d,\n", g->g_ndfas);
    fprintf(fp, "    dfas,\n");
    fprintf(fp, "    {%d, labels},\n", g->g_ll.ll_nlabels);
    fprintf(fp, "    %d\n", g->g_start);
    fprintf(fp, "};\n");
}

void
printnonterminals(grammar *g, FILE *fp)
{
    dfa *d;
    int i;

    fprintf(fp, "/* Generated by Parser/pgen */\n\n");

    d = g->g_dfa;
    for (i = g->g_ndfas; --i >= 0; d++)
        fprintf(fp, "#define %s %d\n", d->d_name, d->d_type);
}

static void
printarcs(int i, dfa *d, FILE *fp)
{
    arc *a;
    state *s;
    int j, k;

    s = d->d_state;
    for (j = 0; j < d->d_nstates; j++, s++) {
        fprintf(fp, "static arc arcs_%d_%d[%d] = {\n",
            i, j, s->s_narcs);
        a = s->s_arc;
        for (k = 0; k < s->s_narcs; k++, a++)
            fprintf(fp, "    {%d, %d},\n", a->a_lbl, a->a_arrow);
        fprintf(fp, "};\n");
    }
}

static void
printstates(grammar *g, FILE *fp)
{
    state *s;
    dfa *d;
    int i, j;

    d = g->g_dfa;
    for (i = 0; i < g->g_ndfas; i++, d++) {
        printarcs(i, d, fp);
        fprintf(fp, "static state states_%d[%d] = {\n",
            i, d->d_nstates);
        s = d->d_state;
        for (j = 0; j < d->d_nstates; j++, s++)
            fprintf(fp, "    {%d, arcs_%d_%d},\n",
                s->s_narcs, i, j);
        fprintf(fp, "};\n");
    }
}

static void
printdfas(grammar *g, FILE *fp)
{
    dfa *d;
    int i, j, n;

    printstates(g, fp);
    fprintf(fp, "static dfa dfas[%d] = {\n", g->g_ndfas);
    d = g->g_dfa;
    for (i = 0; i < g->g_ndfas; i++, d++) {
        fprintf(fp, "    {%d, \"%s\", %d, %d, states_%d,\n",
            d->d_type, d->d_name, d->d_initial, d->d_nstates, i);
        fprintf(fp, "     \"");
        n = NBYTES(g->g_ll.ll_nlabels);
        for (j = 0; j < n; j++)
            fprintf(fp, "\\%03o", d->d_first[j] & 0xff);
        fprintf(fp, "\"},\n");
    }
    fprintf(fp, "};\n");
}

static void
printlabels(grammar *g, FILE *fp)
{
    label *l;
    int i;

    fprintf(fp, "static label labels[%d] = {\n", g->g_ll.ll_nlabels);
    l = g->g_ll.ll_label;
    for (i = g->g_ll.ll_nlabels; --i >= 0; l++) {
        if (l->lb_str == NULL)
            fprintf(fp, "    {%d, 0},\n", l->lb_type);
        else
            fprintf(fp, "    {%d, \"%s\"},\n",
                l->lb_type, l->lb_str);
    }
    fprintf(fp, "};\n");
}