Guido van Rossum | f70e43a | 1991-02-19 12:39:46 +0000 | [diff] [blame] | 1 | /*********************************************************** |
| 2 | Copyright 1991 by Stichting Mathematisch Centrum, Amsterdam, The |
| 3 | Netherlands. |
| 4 | |
| 5 | All Rights Reserved |
| 6 | |
| 7 | Permission to use, copy, modify, and distribute this software and its |
| 8 | documentation for any purpose and without fee is hereby granted, |
| 9 | provided that the above copyright notice appear in all copies and that |
| 10 | both that copyright notice and this permission notice appear in |
| 11 | supporting documentation, and that the names of Stichting Mathematisch |
| 12 | Centrum or CWI not be used in advertising or publicity pertaining to |
| 13 | distribution of the software without specific, written prior permission. |
| 14 | |
| 15 | STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO |
| 16 | THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND |
| 17 | FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE |
| 18 | FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 19 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| 20 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT |
| 21 | OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 22 | |
| 23 | ******************************************************************/ |
| 24 | |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 25 | /* Grammar implementation */ |
| 26 | |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 27 | #include "pgenheaders.h" |
| 28 | |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 29 | #include <ctype.h> |
| 30 | |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 31 | #include "assert.h" |
| 32 | #include "token.h" |
| 33 | #include "grammar.h" |
| 34 | |
| 35 | extern int debugging; |
| 36 | |
| 37 | grammar * |
| 38 | newgrammar(start) |
| 39 | int start; |
| 40 | { |
| 41 | grammar *g; |
| 42 | |
| 43 | g = NEW(grammar, 1); |
| 44 | if (g == NULL) |
| 45 | fatal("no mem for new grammar"); |
| 46 | g->g_ndfas = 0; |
| 47 | g->g_dfa = NULL; |
| 48 | g->g_start = start; |
| 49 | g->g_ll.ll_nlabels = 0; |
| 50 | g->g_ll.ll_label = NULL; |
| 51 | return g; |
| 52 | } |
| 53 | |
| 54 | dfa * |
| 55 | adddfa(g, type, name) |
| 56 | grammar *g; |
| 57 | int type; |
| 58 | char *name; |
| 59 | { |
| 60 | dfa *d; |
| 61 | |
| 62 | RESIZE(g->g_dfa, dfa, g->g_ndfas + 1); |
| 63 | if (g->g_dfa == NULL) |
| 64 | fatal("no mem to resize dfa in adddfa"); |
| 65 | d = &g->g_dfa[g->g_ndfas++]; |
| 66 | d->d_type = type; |
| 67 | d->d_name = name; |
| 68 | d->d_nstates = 0; |
| 69 | d->d_state = NULL; |
| 70 | d->d_initial = -1; |
| 71 | d->d_first = NULL; |
| 72 | return d; /* Only use while fresh! */ |
| 73 | } |
| 74 | |
| 75 | int |
| 76 | addstate(d) |
| 77 | dfa *d; |
| 78 | { |
| 79 | state *s; |
| 80 | |
| 81 | RESIZE(d->d_state, state, d->d_nstates + 1); |
| 82 | if (d->d_state == NULL) |
| 83 | fatal("no mem to resize state in addstate"); |
| 84 | s = &d->d_state[d->d_nstates++]; |
| 85 | s->s_narcs = 0; |
| 86 | s->s_arc = NULL; |
| 87 | return s - d->d_state; |
| 88 | } |
| 89 | |
| 90 | void |
| 91 | addarc(d, from, to, lbl) |
| 92 | dfa *d; |
| 93 | int lbl; |
| 94 | { |
| 95 | state *s; |
| 96 | arc *a; |
| 97 | |
| 98 | assert(0 <= from && from < d->d_nstates); |
| 99 | assert(0 <= to && to < d->d_nstates); |
| 100 | |
| 101 | s = &d->d_state[from]; |
| 102 | RESIZE(s->s_arc, arc, s->s_narcs + 1); |
| 103 | if (s->s_arc == NULL) |
| 104 | fatal("no mem to resize arc list in addarc"); |
| 105 | a = &s->s_arc[s->s_narcs++]; |
| 106 | a->a_lbl = lbl; |
| 107 | a->a_arrow = to; |
| 108 | } |
| 109 | |
| 110 | int |
| 111 | addlabel(ll, type, str) |
| 112 | labellist *ll; |
| 113 | int type; |
| 114 | char *str; |
| 115 | { |
| 116 | int i; |
| 117 | label *lb; |
| 118 | |
| 119 | for (i = 0; i < ll->ll_nlabels; i++) { |
| 120 | if (ll->ll_label[i].lb_type == type && |
| 121 | strcmp(ll->ll_label[i].lb_str, str) == 0) |
| 122 | return i; |
| 123 | } |
| 124 | RESIZE(ll->ll_label, label, ll->ll_nlabels + 1); |
| 125 | if (ll->ll_label == NULL) |
| 126 | fatal("no mem to resize labellist in addlabel"); |
| 127 | lb = &ll->ll_label[ll->ll_nlabels++]; |
| 128 | lb->lb_type = type; |
| 129 | lb->lb_str = str; /* XXX strdup(str) ??? */ |
| 130 | return lb - ll->ll_label; |
| 131 | } |
| 132 | |
| 133 | /* Same, but rather dies than adds */ |
| 134 | |
| 135 | int |
| 136 | findlabel(ll, type, str) |
| 137 | labellist *ll; |
| 138 | int type; |
| 139 | char *str; |
| 140 | { |
| 141 | int i; |
| 142 | label *lb; |
| 143 | |
| 144 | for (i = 0; i < ll->ll_nlabels; i++) { |
| 145 | if (ll->ll_label[i].lb_type == type /*&& |
| 146 | strcmp(ll->ll_label[i].lb_str, str) == 0*/) |
| 147 | return i; |
| 148 | } |
| 149 | fprintf(stderr, "Label %d/'%s' not found\n", type, str); |
| 150 | abort(); |
| 151 | } |
| 152 | |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 153 | /* Forward */ |
| 154 | static void translabel PROTO((grammar *, label *)); |
| 155 | |
| 156 | void |
| 157 | translatelabels(g) |
| 158 | grammar *g; |
| 159 | { |
| 160 | int i; |
| 161 | |
| 162 | printf("Translating labels ...\n"); |
| 163 | /* Don't translate EMPTY */ |
| 164 | for (i = EMPTY+1; i < g->g_ll.ll_nlabels; i++) |
| 165 | translabel(g, &g->g_ll.ll_label[i]); |
| 166 | } |
| 167 | |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 168 | static void |
| 169 | translabel(g, lb) |
| 170 | grammar *g; |
| 171 | label *lb; |
| 172 | { |
| 173 | int i; |
| 174 | |
| 175 | if (debugging) |
| 176 | printf("Translating label %s ...\n", labelrepr(lb)); |
| 177 | |
| 178 | if (lb->lb_type == NAME) { |
| 179 | for (i = 0; i < g->g_ndfas; i++) { |
| 180 | if (strcmp(lb->lb_str, g->g_dfa[i].d_name) == 0) { |
| 181 | if (debugging) |
| 182 | printf("Label %s is non-terminal %d.\n", |
| 183 | lb->lb_str, |
| 184 | g->g_dfa[i].d_type); |
| 185 | lb->lb_type = g->g_dfa[i].d_type; |
| 186 | lb->lb_str = NULL; |
| 187 | return; |
| 188 | } |
| 189 | } |
| 190 | for (i = 0; i < (int)N_TOKENS; i++) { |
| 191 | if (strcmp(lb->lb_str, tok_name[i]) == 0) { |
| 192 | if (debugging) |
| 193 | printf("Label %s is terminal %d.\n", |
| 194 | lb->lb_str, i); |
| 195 | lb->lb_type = i; |
| 196 | lb->lb_str = NULL; |
| 197 | return; |
| 198 | } |
| 199 | } |
| 200 | printf("Can't translate NAME label '%s'\n", lb->lb_str); |
| 201 | return; |
| 202 | } |
| 203 | |
| 204 | if (lb->lb_type == STRING) { |
| 205 | if (isalpha(lb->lb_str[1])) { |
| 206 | char *p, *strchr(); |
| 207 | if (debugging) |
| 208 | printf("Label %s is a keyword\n", lb->lb_str); |
| 209 | lb->lb_type = NAME; |
| 210 | lb->lb_str++; |
| 211 | p = strchr(lb->lb_str, '\''); |
| 212 | if (p) |
| 213 | *p = '\0'; |
| 214 | } |
Guido van Rossum | c64d04d | 1991-10-20 20:20:00 +0000 | [diff] [blame] | 215 | else if (lb->lb_str[2] == lb->lb_str[0]) { |
| 216 | int type = (int) tok_1char(lb->lb_str[1]); |
| 217 | if (type != OP) { |
| 218 | lb->lb_type = type; |
| 219 | lb->lb_str = NULL; |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 220 | } |
| 221 | else |
Guido van Rossum | c64d04d | 1991-10-20 20:20:00 +0000 | [diff] [blame] | 222 | printf("Unknown OP label %s\n", |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 223 | lb->lb_str); |
| 224 | } |
Guido van Rossum | c64d04d | 1991-10-20 20:20:00 +0000 | [diff] [blame] | 225 | else if (lb->lb_str[2] && lb->lb_str[3] == lb->lb_str[0]) { |
| 226 | int type = (int) tok_2char(lb->lb_str[1], |
| 227 | lb->lb_str[2]); |
| 228 | if (type != OP) { |
| 229 | lb->lb_type = type; |
| 230 | lb->lb_str = NULL; |
| 231 | } |
| 232 | else |
| 233 | printf("Unknown OP label %s\n", |
| 234 | lb->lb_str); |
| 235 | } |
| 236 | else |
| 237 | printf("Can't translate STRING label %s\n", |
| 238 | lb->lb_str); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 239 | } |
| 240 | else |
| 241 | printf("Can't translate label '%s'\n", labelrepr(lb)); |
| 242 | } |