Guido van Rossum | f70e43a | 1991-02-19 12:39:46 +0000 | [diff] [blame] | 1 | /*********************************************************** |
Guido van Rossum | b9f8d6e | 1995-01-04 19:08:09 +0000 | [diff] [blame] | 2 | Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam, |
| 3 | The Netherlands. |
Guido van Rossum | f70e43a | 1991-02-19 12:39:46 +0000 | [diff] [blame] | 4 | |
| 5 | All Rights Reserved |
| 6 | |
Guido van Rossum | fd71b9e | 2000-06-30 23:50:40 +0000 | [diff] [blame^] | 7 | Copyright (c) 2000, BeOpen.com. |
| 8 | Copyright (c) 1995-2000, Corporation for National Research Initiatives. |
| 9 | Copyright (c) 1990-1995, Stichting Mathematisch Centrum. |
| 10 | All rights reserved. |
Guido van Rossum | f70e43a | 1991-02-19 12:39:46 +0000 | [diff] [blame] | 11 | |
Guido van Rossum | fd71b9e | 2000-06-30 23:50:40 +0000 | [diff] [blame^] | 12 | See the file "Misc/COPYRIGHT" for information on usage and |
| 13 | redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
Guido van Rossum | f70e43a | 1991-02-19 12:39:46 +0000 | [diff] [blame] | 14 | |
| 15 | ******************************************************************/ |
| 16 | |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 17 | /* Grammar implementation */ |
| 18 | |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 19 | #include "pgenheaders.h" |
| 20 | |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 21 | #include <ctype.h> |
| 22 | |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 23 | #include "assert.h" |
| 24 | #include "token.h" |
| 25 | #include "grammar.h" |
| 26 | |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 27 | extern int Py_DebugFlag; |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 28 | |
| 29 | grammar * |
| 30 | newgrammar(start) |
| 31 | int start; |
| 32 | { |
| 33 | grammar *g; |
| 34 | |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 35 | g = PyMem_NEW(grammar, 1); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 36 | if (g == NULL) |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 37 | Py_FatalError("no mem for new grammar"); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 38 | g->g_ndfas = 0; |
| 39 | g->g_dfa = NULL; |
| 40 | g->g_start = start; |
| 41 | g->g_ll.ll_nlabels = 0; |
| 42 | g->g_ll.ll_label = NULL; |
Guido van Rossum | 588633d | 1994-12-30 15:46:02 +0000 | [diff] [blame] | 43 | g->g_accel = 0; |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 44 | return g; |
| 45 | } |
| 46 | |
| 47 | dfa * |
| 48 | adddfa(g, type, name) |
| 49 | grammar *g; |
| 50 | int type; |
| 51 | char *name; |
| 52 | { |
| 53 | dfa *d; |
| 54 | |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 55 | PyMem_RESIZE(g->g_dfa, dfa, g->g_ndfas + 1); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 56 | if (g->g_dfa == NULL) |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 57 | Py_FatalError("no mem to resize dfa in adddfa"); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 58 | d = &g->g_dfa[g->g_ndfas++]; |
| 59 | d->d_type = type; |
| 60 | d->d_name = name; |
| 61 | d->d_nstates = 0; |
| 62 | d->d_state = NULL; |
| 63 | d->d_initial = -1; |
| 64 | d->d_first = NULL; |
| 65 | return d; /* Only use while fresh! */ |
| 66 | } |
| 67 | |
| 68 | int |
| 69 | addstate(d) |
| 70 | dfa *d; |
| 71 | { |
| 72 | state *s; |
| 73 | |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 74 | PyMem_RESIZE(d->d_state, state, d->d_nstates + 1); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 75 | if (d->d_state == NULL) |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 76 | Py_FatalError("no mem to resize state in addstate"); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 77 | s = &d->d_state[d->d_nstates++]; |
| 78 | s->s_narcs = 0; |
| 79 | s->s_arc = NULL; |
Guido van Rossum | 588633d | 1994-12-30 15:46:02 +0000 | [diff] [blame] | 80 | s->s_lower = 0; |
| 81 | s->s_upper = 0; |
| 82 | s->s_accel = NULL; |
| 83 | s->s_accept = 0; |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 84 | return s - d->d_state; |
| 85 | } |
| 86 | |
| 87 | void |
| 88 | addarc(d, from, to, lbl) |
| 89 | dfa *d; |
| 90 | int lbl; |
| 91 | { |
| 92 | state *s; |
| 93 | arc *a; |
| 94 | |
| 95 | assert(0 <= from && from < d->d_nstates); |
| 96 | assert(0 <= to && to < d->d_nstates); |
| 97 | |
| 98 | s = &d->d_state[from]; |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 99 | PyMem_RESIZE(s->s_arc, arc, s->s_narcs + 1); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 100 | if (s->s_arc == NULL) |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 101 | Py_FatalError("no mem to resize arc list in addarc"); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 102 | a = &s->s_arc[s->s_narcs++]; |
| 103 | a->a_lbl = lbl; |
| 104 | a->a_arrow = to; |
| 105 | } |
| 106 | |
| 107 | int |
| 108 | addlabel(ll, type, str) |
| 109 | labellist *ll; |
| 110 | int type; |
| 111 | char *str; |
| 112 | { |
| 113 | int i; |
| 114 | label *lb; |
| 115 | |
| 116 | for (i = 0; i < ll->ll_nlabels; i++) { |
| 117 | if (ll->ll_label[i].lb_type == type && |
| 118 | strcmp(ll->ll_label[i].lb_str, str) == 0) |
| 119 | return i; |
| 120 | } |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 121 | PyMem_RESIZE(ll->ll_label, label, ll->ll_nlabels + 1); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 122 | if (ll->ll_label == NULL) |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 123 | Py_FatalError("no mem to resize labellist in addlabel"); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 124 | lb = &ll->ll_label[ll->ll_nlabels++]; |
| 125 | lb->lb_type = type; |
| 126 | lb->lb_str = str; /* XXX strdup(str) ??? */ |
| 127 | return lb - ll->ll_label; |
| 128 | } |
| 129 | |
| 130 | /* Same, but rather dies than adds */ |
| 131 | |
| 132 | int |
| 133 | findlabel(ll, type, str) |
| 134 | labellist *ll; |
| 135 | int type; |
| 136 | char *str; |
| 137 | { |
| 138 | int i; |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 139 | |
| 140 | for (i = 0; i < ll->ll_nlabels; i++) { |
| 141 | if (ll->ll_label[i].lb_type == type /*&& |
| 142 | strcmp(ll->ll_label[i].lb_str, str) == 0*/) |
| 143 | return i; |
| 144 | } |
| 145 | fprintf(stderr, "Label %d/'%s' not found\n", type, str); |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 146 | Py_FatalError("grammar.c:findlabel()"); |
Guido van Rossum | fd8a393 | 1996-12-02 18:27:33 +0000 | [diff] [blame] | 147 | return 0; /* Make gcc -Wall happy */ |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 148 | } |
| 149 | |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 150 | /* Forward */ |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 151 | static void translabel Py_PROTO((grammar *, label *)); |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 152 | |
| 153 | void |
| 154 | translatelabels(g) |
| 155 | grammar *g; |
| 156 | { |
| 157 | int i; |
Guido van Rossum | 588633d | 1994-12-30 15:46:02 +0000 | [diff] [blame] | 158 | |
Guido van Rossum | 408027e | 1996-12-30 16:17:54 +0000 | [diff] [blame] | 159 | #ifdef Py_DEBUG |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 160 | printf("Translating labels ...\n"); |
Guido van Rossum | 588633d | 1994-12-30 15:46:02 +0000 | [diff] [blame] | 161 | #endif |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 162 | /* Don't translate EMPTY */ |
| 163 | for (i = EMPTY+1; i < g->g_ll.ll_nlabels; i++) |
| 164 | translabel(g, &g->g_ll.ll_label[i]); |
| 165 | } |
| 166 | |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 167 | static void |
| 168 | translabel(g, lb) |
| 169 | grammar *g; |
| 170 | label *lb; |
| 171 | { |
| 172 | int i; |
| 173 | |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 174 | if (Py_DebugFlag) |
| 175 | printf("Translating label %s ...\n", PyGrammar_LabelRepr(lb)); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 176 | |
| 177 | if (lb->lb_type == NAME) { |
| 178 | for (i = 0; i < g->g_ndfas; i++) { |
| 179 | if (strcmp(lb->lb_str, g->g_dfa[i].d_name) == 0) { |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 180 | if (Py_DebugFlag) |
| 181 | printf( |
| 182 | "Label %s is non-terminal %d.\n", |
| 183 | lb->lb_str, |
| 184 | g->g_dfa[i].d_type); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 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++) { |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 191 | if (strcmp(lb->lb_str, _PyParser_TokenNames[i]) == 0) { |
| 192 | if (Py_DebugFlag) |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 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) { |
Guido van Rossum | bb3649e | 1998-04-10 22:09:39 +0000 | [diff] [blame] | 205 | if (isalpha((int)(lb->lb_str[1])) || lb->lb_str[1] == '_') { |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 206 | char *p; |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 207 | if (Py_DebugFlag) |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 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]) { |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 216 | int type = (int) PyToken_OneChar(lb->lb_str[1]); |
Guido van Rossum | c64d04d | 1991-10-20 20:20:00 +0000 | [diff] [blame] | 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]) { |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 226 | int type = (int) PyToken_TwoChars(lb->lb_str[1], |
Guido van Rossum | c64d04d | 1991-10-20 20:20:00 +0000 | [diff] [blame] | 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 |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 241 | printf("Can't translate label '%s'\n", |
| 242 | PyGrammar_LabelRepr(lb)); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 243 | } |