| /* Grammar implementation */ |
| |
| #include "pgenheaders.h" |
| |
| #include <ctype.h> |
| |
| #include "assert.h" |
| #include "token.h" |
| #include "grammar.h" |
| |
| extern int debugging; |
| |
| grammar * |
| newgrammar(start) |
| int start; |
| { |
| grammar *g; |
| |
| g = NEW(grammar, 1); |
| if (g == NULL) |
| fatal("no mem for new grammar"); |
| g->g_ndfas = 0; |
| g->g_dfa = NULL; |
| g->g_start = start; |
| g->g_ll.ll_nlabels = 0; |
| g->g_ll.ll_label = NULL; |
| return g; |
| } |
| |
| dfa * |
| adddfa(g, type, name) |
| grammar *g; |
| int type; |
| char *name; |
| { |
| dfa *d; |
| |
| RESIZE(g->g_dfa, dfa, g->g_ndfas + 1); |
| if (g->g_dfa == NULL) |
| fatal("no mem to resize dfa in adddfa"); |
| d = &g->g_dfa[g->g_ndfas++]; |
| d->d_type = type; |
| d->d_name = name; |
| d->d_nstates = 0; |
| d->d_state = NULL; |
| d->d_initial = -1; |
| d->d_first = NULL; |
| return d; /* Only use while fresh! */ |
| } |
| |
| int |
| addstate(d) |
| dfa *d; |
| { |
| state *s; |
| |
| RESIZE(d->d_state, state, d->d_nstates + 1); |
| if (d->d_state == NULL) |
| fatal("no mem to resize state in addstate"); |
| s = &d->d_state[d->d_nstates++]; |
| s->s_narcs = 0; |
| s->s_arc = NULL; |
| return s - d->d_state; |
| } |
| |
| void |
| addarc(d, from, to, lbl) |
| dfa *d; |
| int lbl; |
| { |
| state *s; |
| arc *a; |
| |
| assert(0 <= from && from < d->d_nstates); |
| assert(0 <= to && to < d->d_nstates); |
| |
| s = &d->d_state[from]; |
| RESIZE(s->s_arc, arc, s->s_narcs + 1); |
| if (s->s_arc == NULL) |
| fatal("no mem to resize arc list in addarc"); |
| a = &s->s_arc[s->s_narcs++]; |
| a->a_lbl = lbl; |
| a->a_arrow = to; |
| } |
| |
| int |
| addlabel(ll, type, str) |
| labellist *ll; |
| int type; |
| char *str; |
| { |
| int i; |
| label *lb; |
| |
| for (i = 0; i < ll->ll_nlabels; i++) { |
| if (ll->ll_label[i].lb_type == type && |
| strcmp(ll->ll_label[i].lb_str, str) == 0) |
| return i; |
| } |
| RESIZE(ll->ll_label, label, ll->ll_nlabels + 1); |
| if (ll->ll_label == NULL) |
| fatal("no mem to resize labellist in addlabel"); |
| lb = &ll->ll_label[ll->ll_nlabels++]; |
| lb->lb_type = type; |
| lb->lb_str = str; /* XXX strdup(str) ??? */ |
| return lb - ll->ll_label; |
| } |
| |
| /* Same, but rather dies than adds */ |
| |
| int |
| findlabel(ll, type, str) |
| labellist *ll; |
| int type; |
| char *str; |
| { |
| int i; |
| label *lb; |
| |
| for (i = 0; i < ll->ll_nlabels; i++) { |
| if (ll->ll_label[i].lb_type == type /*&& |
| strcmp(ll->ll_label[i].lb_str, str) == 0*/) |
| return i; |
| } |
| fprintf(stderr, "Label %d/'%s' not found\n", type, str); |
| abort(); |
| } |
| |
| /* Forward */ |
| static void translabel PROTO((grammar *, label *)); |
| |
| void |
| translatelabels(g) |
| grammar *g; |
| { |
| int i; |
| |
| printf("Translating labels ...\n"); |
| /* Don't translate EMPTY */ |
| for (i = EMPTY+1; i < g->g_ll.ll_nlabels; i++) |
| translabel(g, &g->g_ll.ll_label[i]); |
| } |
| |
| static void |
| translabel(g, lb) |
| grammar *g; |
| label *lb; |
| { |
| int i; |
| |
| if (debugging) |
| printf("Translating label %s ...\n", labelrepr(lb)); |
| |
| if (lb->lb_type == NAME) { |
| for (i = 0; i < g->g_ndfas; i++) { |
| if (strcmp(lb->lb_str, g->g_dfa[i].d_name) == 0) { |
| if (debugging) |
| printf("Label %s is non-terminal %d.\n", |
| lb->lb_str, |
| g->g_dfa[i].d_type); |
| lb->lb_type = g->g_dfa[i].d_type; |
| lb->lb_str = NULL; |
| return; |
| } |
| } |
| for (i = 0; i < (int)N_TOKENS; i++) { |
| if (strcmp(lb->lb_str, tok_name[i]) == 0) { |
| if (debugging) |
| printf("Label %s is terminal %d.\n", |
| lb->lb_str, i); |
| lb->lb_type = i; |
| lb->lb_str = NULL; |
| return; |
| } |
| } |
| printf("Can't translate NAME label '%s'\n", lb->lb_str); |
| return; |
| } |
| |
| if (lb->lb_type == STRING) { |
| if (isalpha(lb->lb_str[1])) { |
| char *p, *strchr(); |
| if (debugging) |
| printf("Label %s is a keyword\n", lb->lb_str); |
| lb->lb_type = NAME; |
| lb->lb_str++; |
| p = strchr(lb->lb_str, '\''); |
| if (p) |
| *p = '\0'; |
| } |
| else { |
| if (lb->lb_str[2] == lb->lb_str[0]) { |
| int type = (int) tok_1char(lb->lb_str[1]); |
| if (type != OP) { |
| lb->lb_type = type; |
| lb->lb_str = NULL; |
| } |
| else |
| printf("Unknown OP label %s\n", |
| lb->lb_str); |
| } |
| else |
| printf("Can't translate STRING label %s\n", |
| lb->lb_str); |
| } |
| } |
| else |
| printf("Can't translate label '%s'\n", labelrepr(lb)); |
| } |