Guido van Rossum | f70e43a | 1991-02-19 12:39:46 +0000 | [diff] [blame] | 1 | /*********************************************************** |
Guido van Rossum | fd71b9e | 2000-06-30 23:50:40 +0000 | [diff] [blame] | 2 | Copyright (c) 2000, BeOpen.com. |
| 3 | Copyright (c) 1995-2000, Corporation for National Research Initiatives. |
| 4 | Copyright (c) 1990-1995, Stichting Mathematisch Centrum. |
| 5 | All rights reserved. |
Guido van Rossum | f70e43a | 1991-02-19 12:39:46 +0000 | [diff] [blame] | 6 | |
Guido van Rossum | fd71b9e | 2000-06-30 23:50:40 +0000 | [diff] [blame] | 7 | See the file "Misc/COPYRIGHT" for information on usage and |
| 8 | redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
Guido van Rossum | f70e43a | 1991-02-19 12:39:46 +0000 | [diff] [blame] | 9 | ******************************************************************/ |
| 10 | |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 11 | /* Grammar implementation */ |
| 12 | |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 13 | #include "pgenheaders.h" |
| 14 | |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 15 | #include <ctype.h> |
| 16 | |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 17 | #include "assert.h" |
| 18 | #include "token.h" |
| 19 | #include "grammar.h" |
| 20 | |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 21 | extern int Py_DebugFlag; |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 22 | |
| 23 | grammar * |
| 24 | newgrammar(start) |
| 25 | int start; |
| 26 | { |
| 27 | grammar *g; |
| 28 | |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 29 | g = PyMem_NEW(grammar, 1); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 30 | if (g == NULL) |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 31 | Py_FatalError("no mem for new grammar"); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 32 | g->g_ndfas = 0; |
| 33 | g->g_dfa = NULL; |
| 34 | g->g_start = start; |
| 35 | g->g_ll.ll_nlabels = 0; |
| 36 | g->g_ll.ll_label = NULL; |
Guido van Rossum | 588633d | 1994-12-30 15:46:02 +0000 | [diff] [blame] | 37 | g->g_accel = 0; |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 38 | return g; |
| 39 | } |
| 40 | |
| 41 | dfa * |
| 42 | adddfa(g, type, name) |
| 43 | grammar *g; |
| 44 | int type; |
| 45 | char *name; |
| 46 | { |
| 47 | dfa *d; |
| 48 | |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 49 | PyMem_RESIZE(g->g_dfa, dfa, g->g_ndfas + 1); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 50 | if (g->g_dfa == NULL) |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 51 | Py_FatalError("no mem to resize dfa in adddfa"); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 52 | d = &g->g_dfa[g->g_ndfas++]; |
| 53 | d->d_type = type; |
| 54 | d->d_name = name; |
| 55 | d->d_nstates = 0; |
| 56 | d->d_state = NULL; |
| 57 | d->d_initial = -1; |
| 58 | d->d_first = NULL; |
| 59 | return d; /* Only use while fresh! */ |
| 60 | } |
| 61 | |
| 62 | int |
| 63 | addstate(d) |
| 64 | dfa *d; |
| 65 | { |
| 66 | state *s; |
| 67 | |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 68 | PyMem_RESIZE(d->d_state, state, d->d_nstates + 1); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 69 | if (d->d_state == NULL) |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 70 | Py_FatalError("no mem to resize state in addstate"); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 71 | s = &d->d_state[d->d_nstates++]; |
| 72 | s->s_narcs = 0; |
| 73 | s->s_arc = NULL; |
Guido van Rossum | 588633d | 1994-12-30 15:46:02 +0000 | [diff] [blame] | 74 | s->s_lower = 0; |
| 75 | s->s_upper = 0; |
| 76 | s->s_accel = NULL; |
| 77 | s->s_accept = 0; |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 78 | return s - d->d_state; |
| 79 | } |
| 80 | |
| 81 | void |
| 82 | addarc(d, from, to, lbl) |
| 83 | dfa *d; |
| 84 | int lbl; |
| 85 | { |
| 86 | state *s; |
| 87 | arc *a; |
| 88 | |
| 89 | assert(0 <= from && from < d->d_nstates); |
| 90 | assert(0 <= to && to < d->d_nstates); |
| 91 | |
| 92 | s = &d->d_state[from]; |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 93 | PyMem_RESIZE(s->s_arc, arc, s->s_narcs + 1); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 94 | if (s->s_arc == NULL) |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 95 | Py_FatalError("no mem to resize arc list in addarc"); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 96 | a = &s->s_arc[s->s_narcs++]; |
| 97 | a->a_lbl = lbl; |
| 98 | a->a_arrow = to; |
| 99 | } |
| 100 | |
| 101 | int |
| 102 | addlabel(ll, type, str) |
| 103 | labellist *ll; |
| 104 | int type; |
| 105 | char *str; |
| 106 | { |
| 107 | int i; |
| 108 | label *lb; |
| 109 | |
| 110 | for (i = 0; i < ll->ll_nlabels; i++) { |
| 111 | if (ll->ll_label[i].lb_type == type && |
| 112 | strcmp(ll->ll_label[i].lb_str, str) == 0) |
| 113 | return i; |
| 114 | } |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 115 | PyMem_RESIZE(ll->ll_label, label, ll->ll_nlabels + 1); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 116 | if (ll->ll_label == NULL) |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 117 | Py_FatalError("no mem to resize labellist in addlabel"); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 118 | lb = &ll->ll_label[ll->ll_nlabels++]; |
| 119 | lb->lb_type = type; |
| 120 | lb->lb_str = str; /* XXX strdup(str) ??? */ |
| 121 | return lb - ll->ll_label; |
| 122 | } |
| 123 | |
| 124 | /* Same, but rather dies than adds */ |
| 125 | |
| 126 | int |
| 127 | findlabel(ll, type, str) |
| 128 | labellist *ll; |
| 129 | int type; |
| 130 | char *str; |
| 131 | { |
| 132 | int i; |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 133 | |
| 134 | for (i = 0; i < ll->ll_nlabels; i++) { |
| 135 | if (ll->ll_label[i].lb_type == type /*&& |
| 136 | strcmp(ll->ll_label[i].lb_str, str) == 0*/) |
| 137 | return i; |
| 138 | } |
| 139 | fprintf(stderr, "Label %d/'%s' not found\n", type, str); |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 140 | Py_FatalError("grammar.c:findlabel()"); |
Guido van Rossum | fd8a393 | 1996-12-02 18:27:33 +0000 | [diff] [blame] | 141 | return 0; /* Make gcc -Wall happy */ |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 142 | } |
| 143 | |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 144 | /* Forward */ |
Tim Peters | dbd9ba6 | 2000-07-09 03:09:57 +0000 | [diff] [blame] | 145 | static void translabel(grammar *, label *); |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 146 | |
| 147 | void |
| 148 | translatelabels(g) |
| 149 | grammar *g; |
| 150 | { |
| 151 | int i; |
Guido van Rossum | 588633d | 1994-12-30 15:46:02 +0000 | [diff] [blame] | 152 | |
Guido van Rossum | 408027e | 1996-12-30 16:17:54 +0000 | [diff] [blame] | 153 | #ifdef Py_DEBUG |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 154 | printf("Translating labels ...\n"); |
Guido van Rossum | 588633d | 1994-12-30 15:46:02 +0000 | [diff] [blame] | 155 | #endif |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 156 | /* Don't translate EMPTY */ |
| 157 | for (i = EMPTY+1; i < g->g_ll.ll_nlabels; i++) |
| 158 | translabel(g, &g->g_ll.ll_label[i]); |
| 159 | } |
| 160 | |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 161 | static void |
| 162 | translabel(g, lb) |
| 163 | grammar *g; |
| 164 | label *lb; |
| 165 | { |
| 166 | int i; |
| 167 | |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 168 | if (Py_DebugFlag) |
| 169 | printf("Translating label %s ...\n", PyGrammar_LabelRepr(lb)); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 170 | |
| 171 | if (lb->lb_type == NAME) { |
| 172 | for (i = 0; i < g->g_ndfas; i++) { |
| 173 | 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] | 174 | if (Py_DebugFlag) |
| 175 | printf( |
| 176 | "Label %s is non-terminal %d.\n", |
| 177 | lb->lb_str, |
| 178 | g->g_dfa[i].d_type); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 179 | lb->lb_type = g->g_dfa[i].d_type; |
| 180 | lb->lb_str = NULL; |
| 181 | return; |
| 182 | } |
| 183 | } |
| 184 | for (i = 0; i < (int)N_TOKENS; i++) { |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 185 | if (strcmp(lb->lb_str, _PyParser_TokenNames[i]) == 0) { |
| 186 | if (Py_DebugFlag) |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 187 | printf("Label %s is terminal %d.\n", |
| 188 | lb->lb_str, i); |
| 189 | lb->lb_type = i; |
| 190 | lb->lb_str = NULL; |
| 191 | return; |
| 192 | } |
| 193 | } |
| 194 | printf("Can't translate NAME label '%s'\n", lb->lb_str); |
| 195 | return; |
| 196 | } |
| 197 | |
| 198 | if (lb->lb_type == STRING) { |
Guido van Rossum | bb3649e | 1998-04-10 22:09:39 +0000 | [diff] [blame] | 199 | if (isalpha((int)(lb->lb_str[1])) || lb->lb_str[1] == '_') { |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 200 | char *p; |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 201 | if (Py_DebugFlag) |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 202 | printf("Label %s is a keyword\n", lb->lb_str); |
| 203 | lb->lb_type = NAME; |
| 204 | lb->lb_str++; |
| 205 | p = strchr(lb->lb_str, '\''); |
| 206 | if (p) |
| 207 | *p = '\0'; |
| 208 | } |
Guido van Rossum | c64d04d | 1991-10-20 20:20:00 +0000 | [diff] [blame] | 209 | else if (lb->lb_str[2] == lb->lb_str[0]) { |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 210 | int type = (int) PyToken_OneChar(lb->lb_str[1]); |
Guido van Rossum | c64d04d | 1991-10-20 20:20:00 +0000 | [diff] [blame] | 211 | if (type != OP) { |
| 212 | lb->lb_type = type; |
| 213 | lb->lb_str = NULL; |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 214 | } |
| 215 | else |
Guido van Rossum | c64d04d | 1991-10-20 20:20:00 +0000 | [diff] [blame] | 216 | printf("Unknown OP label %s\n", |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 217 | lb->lb_str); |
| 218 | } |
Guido van Rossum | c64d04d | 1991-10-20 20:20:00 +0000 | [diff] [blame] | 219 | 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] | 220 | int type = (int) PyToken_TwoChars(lb->lb_str[1], |
Guido van Rossum | c64d04d | 1991-10-20 20:20:00 +0000 | [diff] [blame] | 221 | lb->lb_str[2]); |
| 222 | if (type != OP) { |
| 223 | lb->lb_type = type; |
| 224 | lb->lb_str = NULL; |
| 225 | } |
| 226 | else |
| 227 | printf("Unknown OP label %s\n", |
| 228 | lb->lb_str); |
| 229 | } |
| 230 | else |
| 231 | printf("Can't translate STRING label %s\n", |
| 232 | lb->lb_str); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 233 | } |
| 234 | else |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 235 | printf("Can't translate label '%s'\n", |
| 236 | PyGrammar_LabelRepr(lb)); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 237 | } |