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annotate lwlib/lw_expr.c @ 396:62cb50c50976
Cosmetic updates to documentation; added warning pseudo op
| author | lost@l-w.ca |
|---|---|
| date | Fri, 23 Jul 2010 17:08:57 -0600 |
| parents | a741d2e4869f |
| children | 67815606c5d9 |
| rev | line source |
|---|---|
| 334 | 1 /* |
| 2 lwexpr.c | |
| 3 | |
| 4 Copyright © 2010 William Astle | |
| 5 | |
| 6 This file is part of LWTOOLS. | |
| 7 | |
| 8 LWTOOLS is free software: you can redistribute it and/or modify it under the | |
| 9 terms of the GNU General Public License as published by the Free Software | |
| 10 Foundation, either version 3 of the License, or (at your option) any later | |
| 11 version. | |
| 12 | |
| 13 This program is distributed in the hope that it will be useful, but WITHOUT | |
| 14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
| 16 more details. | |
| 17 | |
| 18 You should have received a copy of the GNU General Public License along with | |
| 19 this program. If not, see <http://www.gnu.org/licenses/>. | |
| 20 */ | |
| 21 | |
| 22 #include <config.h> | |
| 23 | |
| 24 #include <stdarg.h> | |
| 25 #include <stdio.h> | |
| 26 #include <string.h> | |
| 27 | |
| 28 #define ___lw_expr_c_seen___ | |
| 29 #include "lw_alloc.h" | |
| 30 #include "lw_expr.h" | |
| 31 #include "lw_error.h" | |
| 32 #include "lw_string.h" | |
| 33 | |
| 342 | 34 static lw_expr_fn_t *evaluate_special = NULL; |
| 35 static lw_expr_fn2_t *evaluate_var = NULL; | |
|
346
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36 static lw_expr_fn3_t *parse_term = NULL; |
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37 |
| 347 | 38 int lw_expr_istype(lw_expr_t e, int t) |
| 39 { | |
| 40 if (e -> type == t) | |
| 41 return 1; | |
| 42 return 0; | |
| 43 } | |
| 44 | |
| 45 int lw_expr_intval(lw_expr_t e) | |
| 46 { | |
| 47 if (e -> type == lw_expr_type_int) | |
| 48 return e -> value; | |
| 49 return -1; | |
| 50 } | |
| 51 | |
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52 int lw_expr_whichop(lw_expr_t e) |
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53 { |
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54 if (e -> type == lw_expr_type_oper) |
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55 return e -> value; |
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56 return -1; |
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57 } |
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58 |
| 367 | 59 int lw_expr_specint(lw_expr_t e) |
| 60 { | |
| 61 if (e -> type == lw_expr_type_special) | |
| 62 return e -> value; | |
| 63 return -1; | |
| 64 } | |
| 65 | |
|
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66 void lw_expr_set_term_parser(lw_expr_fn3_t *fn) |
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67 { |
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68 parse_term = fn; |
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69 } |
| 337 | 70 |
| 342 | 71 void lw_expr_set_special_handler(lw_expr_fn_t *fn) |
| 337 | 72 { |
| 73 evaluate_special = fn; | |
| 74 } | |
| 75 | |
| 342 | 76 void lw_expr_set_var_handler(lw_expr_fn2_t *fn) |
| 337 | 77 { |
| 78 evaluate_var = fn; | |
| 79 } | |
| 80 | |
| 334 | 81 lw_expr_t lw_expr_create(void) |
| 82 { | |
| 83 lw_expr_t r; | |
| 84 | |
| 85 r = lw_alloc(sizeof(struct lw_expr_priv)); | |
| 86 r -> operands = NULL; | |
| 87 | |
| 88 return r; | |
| 89 } | |
| 90 | |
| 91 void lw_expr_destroy(lw_expr_t E) | |
| 92 { | |
| 337 | 93 struct lw_expr_opers *o; |
| 94 for (o = E -> operands; o; o = o -> next) | |
| 95 lw_expr_destroy(o -> p); | |
| 96 if (E -> type == lw_expr_type_var) | |
| 97 lw_free(E -> value2); | |
| 98 lw_free(E); | |
| 334 | 99 } |
| 100 | |
| 337 | 101 /* actually duplicates the entire expression */ |
| 102 void lw_expr_add_operand(lw_expr_t E, lw_expr_t O); | |
| 334 | 103 lw_expr_t lw_expr_copy(lw_expr_t E) |
| 104 { | |
| 337 | 105 lw_expr_t r, t; |
| 106 struct lw_expr_opers *o; | |
| 107 | |
| 108 r = lw_alloc(sizeof(struct lw_expr_priv)); | |
| 109 *r = *E; | |
| 110 r -> operands = NULL; | |
| 111 | |
| 112 if (E -> type == lw_expr_type_var) | |
| 113 r -> value2 = lw_strdup(E -> value2); | |
| 114 for (o = E -> operands; o; o = o -> next) | |
| 115 { | |
| 116 lw_expr_add_operand(r, lw_expr_copy(o -> p)); | |
| 117 } | |
| 118 | |
| 119 return r; | |
| 334 | 120 } |
| 121 | |
| 122 void lw_expr_add_operand(lw_expr_t E, lw_expr_t O) | |
| 123 { | |
| 124 struct lw_expr_opers *o, *t; | |
| 125 | |
| 126 o = lw_alloc(sizeof(struct lw_expr_opers)); | |
| 127 o -> p = lw_expr_copy(O); | |
| 128 o -> next = NULL; | |
| 129 for (t = E -> operands; t && t -> next; t = t -> next) | |
| 130 /* do nothing */ ; | |
| 131 | |
| 132 if (t) | |
| 133 t -> next = o; | |
| 134 else | |
| 135 E -> operands = o; | |
| 136 } | |
| 137 | |
| 335 | 138 lw_expr_t lw_expr_build_aux(int exprtype, va_list args) |
| 334 | 139 { |
| 140 lw_expr_t r; | |
| 141 int t; | |
| 142 void *p; | |
| 143 | |
| 144 lw_expr_t te1, te2; | |
| 145 | |
| 146 r = lw_expr_create(); | |
| 147 | |
| 148 switch (exprtype) | |
| 149 { | |
| 150 case lw_expr_type_int: | |
| 151 t = va_arg(args, int); | |
| 152 r -> type = lw_expr_type_int; | |
| 153 r -> value = t; | |
| 154 break; | |
| 155 | |
| 156 case lw_expr_type_var: | |
| 157 p = va_arg(args, char *); | |
| 158 r -> type = lw_expr_type_var; | |
| 159 r -> value2 = lw_strdup(p); | |
| 160 break; | |
| 161 | |
| 162 case lw_expr_type_special: | |
| 163 t = va_arg(args, int); | |
| 164 p = va_arg(args, char *); | |
| 165 r -> type = lw_expr_type_special; | |
| 337 | 166 r -> value = t; |
| 334 | 167 r -> value2 = p; |
| 168 break; | |
| 169 | |
| 170 case lw_expr_type_oper: | |
| 171 t = va_arg(args, int); | |
| 172 te1 = va_arg(args, lw_expr_t); | |
| 173 if (t != lw_expr_oper_com && t != lw_expr_oper_neg) | |
| 174 te2 = va_arg(args, lw_expr_t); | |
| 175 else | |
| 176 te2 = NULL; | |
| 177 | |
| 178 r -> type = lw_expr_type_oper; | |
| 179 r -> value = t; | |
| 180 lw_expr_add_operand(r, te1); | |
| 371 | 181 if (te2) |
| 182 lw_expr_add_operand(r, te2); | |
| 334 | 183 break; |
| 184 | |
| 185 default: | |
| 186 lw_error("Invalid expression type specified to lw_expr_build"); | |
| 187 } | |
| 188 | |
| 335 | 189 return r; |
| 190 } | |
| 191 | |
| 192 lw_expr_t lw_expr_build(int exprtype, ...) | |
| 193 { | |
| 194 va_list args; | |
| 195 lw_expr_t r; | |
| 196 | |
| 197 va_start(args, exprtype); | |
| 198 r = lw_expr_build_aux(exprtype, args); | |
| 199 va_end(args); | |
| 200 return r; | |
| 201 } | |
| 202 | |
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203 void lw_expr_print_aux(lw_expr_t E, char **obuf, int *buflen, int *bufloc) |
| 334 | 204 { |
| 205 struct lw_expr_opers *o; | |
| 335 | 206 int c = 0; |
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207 char buf[256]; |
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208 |
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209 if (!E) |
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210 { |
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211 strcpy(buf, "(NULL)"); |
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212 return; |
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213 } |
| 334 | 214 for (o = E -> operands; o; o = o -> next) |
| 215 { | |
| 335 | 216 c++; |
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217 lw_expr_print_aux(o -> p, obuf, buflen, bufloc); |
| 334 | 218 } |
| 219 | |
| 220 switch (E -> type) | |
| 221 { | |
| 222 case lw_expr_type_int: | |
| 371 | 223 if (E -> value < 0) |
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224 snprintf(buf, 256, "-%#x ", -(E -> value)); |
| 371 | 225 else |
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226 snprintf(buf, 256, "%#x ", E -> value); |
| 334 | 227 break; |
| 335 | 228 |
| 229 case lw_expr_type_var: | |
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230 snprintf(buf, 256, "V(%s) ", (char *)(E -> value2)); |
| 335 | 231 break; |
| 232 | |
| 233 case lw_expr_type_special: | |
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234 snprintf(buf, 256, "S(%d,%p) ", E -> value, E -> value2); |
| 335 | 235 break; |
| 236 | |
| 334 | 237 case lw_expr_type_oper: |
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238 snprintf(buf, 256, "[%d]", c); |
| 334 | 239 switch (E -> value) |
| 240 { | |
| 241 case lw_expr_oper_plus: | |
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242 strcat(buf, "+ "); |
| 334 | 243 break; |
| 244 | |
| 245 case lw_expr_oper_minus: | |
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246 strcat(buf, "- "); |
| 334 | 247 break; |
| 248 | |
| 249 case lw_expr_oper_times: | |
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250 strcat(buf, "* "); |
| 334 | 251 break; |
| 252 | |
| 253 case lw_expr_oper_divide: | |
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254 strcat(buf, "/ "); |
| 334 | 255 break; |
| 256 | |
| 257 case lw_expr_oper_mod: | |
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258 strcat(buf, "% "); |
| 334 | 259 break; |
| 260 | |
| 261 case lw_expr_oper_intdiv: | |
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262 strcat(buf, "\\ "); |
| 334 | 263 break; |
| 264 | |
| 265 case lw_expr_oper_bwand: | |
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266 strcat(buf, "BWAND "); |
| 334 | 267 break; |
| 268 | |
| 269 case lw_expr_oper_bwor: | |
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270 strcat(buf, "BWOR "); |
| 334 | 271 break; |
| 272 | |
| 273 case lw_expr_oper_bwxor: | |
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274 strcat(buf, "BWXOR "); |
| 334 | 275 break; |
| 276 | |
| 277 case lw_expr_oper_and: | |
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278 strcat(buf, "AND "); |
| 334 | 279 break; |
| 280 | |
| 281 case lw_expr_oper_or: | |
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282 strcat(buf, "OR "); |
| 334 | 283 break; |
| 284 | |
| 285 case lw_expr_oper_neg: | |
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286 strcat(buf, "NEG "); |
| 334 | 287 break; |
| 288 | |
| 289 case lw_expr_oper_com: | |
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290 strcat(buf, "COM "); |
| 334 | 291 break; |
| 292 | |
| 293 default: | |
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294 strcat(buf, "OPER "); |
| 334 | 295 break; |
| 296 } | |
| 297 break; | |
| 298 default: | |
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299 snprintf(buf, 256, "ERR "); |
| 334 | 300 break; |
| 301 } | |
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302 |
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303 c = strlen(buf); |
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304 if (*bufloc + c >= *buflen) |
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305 { |
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306 *buflen += 128; |
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307 *obuf = lw_realloc(*obuf, *buflen); |
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308 } |
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309 strcpy(*obuf + *bufloc, buf); |
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310 *bufloc += c; |
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311 } |
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312 |
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313 char *lw_expr_print(lw_expr_t E) |
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314 { |
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315 static char *obuf = NULL; |
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316 static int obufsize = 0; |
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317 |
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318 int obufloc = 0; |
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319 |
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320 lw_expr_print_aux(E, &obuf, &obufsize, &obufloc); |
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321 |
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322 return obuf; |
| 334 | 323 } |
| 324 | |
| 325 /* | |
| 326 Return: | |
| 327 nonzero if expressions are the same (identical pointers or matching values) | |
| 328 zero if expressions are not the same | |
| 329 | |
| 330 */ | |
| 331 int lw_expr_compare(lw_expr_t E1, lw_expr_t E2) | |
| 332 { | |
| 333 struct lw_expr_opers *o1, *o2; | |
| 334 | |
| 335 if (E1 == E2) | |
| 336 return 1; | |
| 337 | |
| 338 if (!(E1 -> type == E2 -> type && E1 -> value == E2 -> value)) | |
| 339 return 0; | |
| 340 | |
| 341 if (E1 -> type == lw_expr_type_var) | |
| 342 { | |
| 343 if (!strcmp(E1 -> value2, E2 -> value2)) | |
| 344 return 1; | |
| 345 else | |
| 346 return 0; | |
| 347 } | |
| 348 | |
| 349 if (E1 -> type == lw_expr_type_special) | |
| 350 { | |
| 351 if (E1 -> value2 == E2 -> value2) | |
| 352 return 1; | |
| 353 else | |
| 354 return 0; | |
| 355 } | |
| 356 | |
| 357 for (o1 = E1 -> operands, o2 = E2 -> operands; o1 && o2; o1 = o1 -> next, o2 = o2 -> next) | |
| 358 if (lw_expr_compare(o1 -> p, o2 -> p) == 0) | |
| 359 return 0; | |
| 360 if (o1 || o2) | |
| 361 return 0; | |
| 362 | |
| 363 return 1; | |
| 364 } | |
| 365 | |
| 366 /* return true if E is an operator of type oper */ | |
| 367 int lw_expr_isoper(lw_expr_t E, int oper) | |
| 368 { | |
| 369 if (E -> type == lw_expr_type_oper && E -> value == oper) | |
| 370 return 1; | |
| 371 return 0; | |
| 372 } | |
| 335 | 373 |
| 374 | |
| 375 void lw_expr_simplify_sortconstfirst(lw_expr_t E) | |
| 376 { | |
| 377 struct lw_expr_opers *o; | |
| 371 | 378 |
| 379 if (E -> type != lw_expr_type_oper) | |
| 380 return; | |
| 381 if (E -> value != lw_expr_oper_times && E -> value != lw_expr_oper_plus) | |
| 382 return; | |
| 383 | |
| 335 | 384 for (o = E -> operands; o; o = o -> next) |
| 371 | 385 { |
| 386 if (o -> p -> type == lw_expr_type_oper && (o -> p -> value == lw_expr_oper_times || o -> p -> value == lw_expr_oper_plus)) | |
| 387 lw_expr_simplify_sortconstfirst(o -> p); | |
| 388 } | |
| 335 | 389 |
| 390 for (o = E -> operands; o; o = o -> next) | |
| 391 { | |
| 392 if (o -> p -> type == lw_expr_type_int && o != E -> operands) | |
| 393 { | |
| 394 struct lw_expr_opers *o2; | |
| 395 for (o2 = E -> operands; o2 -> next != o; o2 = o2 -> next) | |
| 396 /* do nothing */ ; | |
| 397 o2 -> next = o -> next; | |
| 398 o -> next = E -> operands; | |
| 399 E -> operands = o; | |
| 400 o = o2; | |
| 401 } | |
| 402 } | |
| 403 } | |
| 404 | |
| 336 | 405 void lw_expr_sortoperandlist(struct lw_expr_opers **o) |
| 406 { | |
| 382 | 407 // fprintf(stderr, "lw_expr_sortoperandlist() not yet implemented\n"); |
| 336 | 408 } |
| 409 | |
| 335 | 410 // return 1 if the operand lists match, 0 if not |
| 411 // may re-order the argument lists | |
| 412 int lw_expr_simplify_compareoperandlist(struct lw_expr_opers **ol1, struct lw_expr_opers **ol2) | |
| 413 { | |
| 414 struct lw_expr_opers *o1, *o2; | |
| 415 | |
| 416 lw_expr_sortoperandlist(ol1); | |
| 417 lw_expr_sortoperandlist(ol2); | |
| 418 | |
| 419 for (o1 = *ol1, o2 = *ol2; o1 && o2; o1 = o1 -> next, o2 = o2 -> next) | |
| 420 { | |
| 421 if (!lw_expr_compare(o1 -> p, o2 -> p)) | |
| 422 return 0; | |
| 423 } | |
| 424 if (o1 || o2) | |
| 425 return 0; | |
| 426 return 1; | |
| 427 } | |
| 428 | |
| 371 | 429 int lw_expr_simplify_isliketerm(lw_expr_t e1, lw_expr_t e2) |
| 430 { | |
| 431 // first term is a "times" | |
| 432 if (e1 -> type == lw_expr_type_oper && e1 -> value == lw_expr_oper_times) | |
| 433 { | |
| 434 // second term is a "times" | |
| 435 if (e2 -> type == lw_expr_type_oper && e2 -> value == lw_expr_oper_times) | |
| 436 { | |
| 437 // both times - easy check | |
| 438 struct lw_expr_opers *o1, *o2; | |
| 439 for (o1 = e1 -> operands; o1; o1 = o1 -> next) | |
| 440 if (o1 -> p -> type != lw_expr_type_int) | |
| 441 break; | |
| 442 | |
| 443 for (o2 = e2 -> operands; o2; o2 = o2 -> next) | |
| 444 if (o2 -> p -> type != lw_expr_type_int) | |
| 445 break; | |
| 446 | |
| 447 if (lw_expr_simplify_compareoperandlist(&o1, &o2)) | |
| 448 return 1; | |
| 449 return 0; | |
| 450 } | |
| 451 | |
| 452 // not a times - have to assume it's the operand list | |
| 453 // with a "1 *" in front if it | |
| 454 if (e1 -> operands -> next -> next) | |
| 455 return 0; | |
| 456 if (!lw_expr_compare(e1 -> operands -> next -> p, e2)) | |
| 457 return 0; | |
| 458 return 1; | |
| 459 } | |
| 460 | |
| 461 // e1 is not a times | |
| 462 if (e2 -> type == lw_expr_type_oper && e2 -> value == lw_expr_oper_times) | |
| 463 { | |
| 464 // e2 is a times | |
| 465 if (e2 -> operands -> next -> next) | |
| 466 return 0; | |
| 467 if (!lw_expr_compare(e1, e2 -> operands -> next -> p)) | |
| 468 return 0; | |
| 469 return 1; | |
| 470 } | |
| 471 | |
| 472 // neither are times | |
| 473 if (!lw_expr_compare(e1, e2)) | |
| 474 return 0; | |
| 475 return 1; | |
| 476 } | |
| 477 | |
|
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Various bugfixes; fixed lwobjdump to display symbols with unprintable characters more sensibly; start of a (nonfunctional for now) testing framework
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478 void lw_expr_simplify(lw_expr_t E, void *priv); |
|
a741d2e4869f
Various bugfixes; fixed lwobjdump to display symbols with unprintable characters more sensibly; start of a (nonfunctional for now) testing framework
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parents:
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changeset
|
479 |
|
a741d2e4869f
Various bugfixes; fixed lwobjdump to display symbols with unprintable characters more sensibly; start of a (nonfunctional for now) testing framework
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parents:
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diff
changeset
|
480 void lw_expr_simplify_go(lw_expr_t E, void *priv) |
| 335 | 481 { |
| 482 struct lw_expr_opers *o; | |
| 483 | |
| 371 | 484 // replace subtraction with O1 + -1(O2)... |
| 485 // needed for like term collection | |
| 486 if (E -> type == lw_expr_type_oper && E -> value == lw_expr_oper_minus) | |
| 487 { | |
| 488 for (o = E -> operands -> next; o; o = o -> next) | |
| 489 { | |
| 490 lw_expr_t e1, e2; | |
| 491 | |
| 492 e2 = lw_expr_build(lw_expr_type_int, -1); | |
| 493 e1 = lw_expr_build(lw_expr_type_oper, lw_expr_oper_times, e2, o -> p); | |
| 494 lw_expr_destroy(o -> p); | |
| 495 lw_expr_destroy(e2); | |
| 496 o -> p = e1; | |
| 497 } | |
| 498 E -> value = lw_expr_oper_plus; | |
| 499 } | |
| 500 | |
| 501 // turn "NEG" into -1(O) - needed for like term collection | |
| 502 if (E -> type == lw_expr_type_oper && E -> value == lw_expr_oper_neg) | |
| 503 { | |
| 504 lw_expr_t e1; | |
| 505 | |
| 506 E -> value = lw_expr_oper_times; | |
| 507 e1 = lw_expr_build(lw_expr_type_int, -1); | |
| 508 lw_expr_add_operand(E, e1); | |
| 509 lw_expr_destroy(e1); | |
| 510 } | |
| 511 | |
| 337 | 512 again: |
| 513 // try to resolve non-constant terms to constants here | |
| 514 if (E -> type == lw_expr_type_special && evaluate_special) | |
| 515 { | |
| 516 lw_expr_t te; | |
| 517 | |
|
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Added expression parsing infrastructure and misc fixes
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518 te = evaluate_special(E -> value, E -> value2, priv); |
| 337 | 519 if (te) |
| 520 { | |
| 521 for (o = E -> operands; o; o = o -> next) | |
| 522 lw_expr_destroy(o -> p); | |
| 523 if (E -> type == lw_expr_type_var) | |
| 524 lw_free(E -> value2); | |
| 525 *E = *te; | |
| 526 E -> operands = NULL; | |
| 527 | |
| 528 if (te -> type == lw_expr_type_var) | |
| 529 E -> value2 = lw_strdup(te -> value2); | |
| 530 for (o = te -> operands; o; o = o -> next) | |
| 531 { | |
| 532 lw_expr_add_operand(E, lw_expr_copy(o -> p)); | |
| 533 } | |
| 534 lw_expr_destroy(te); | |
| 535 goto again; | |
| 536 } | |
| 537 return; | |
| 538 } | |
| 539 | |
| 540 if (E -> type == lw_expr_type_var && evaluate_var) | |
| 541 { | |
| 542 lw_expr_t te; | |
| 543 | |
|
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544 te = evaluate_var(E -> value2, priv); |
| 337 | 545 if (te) |
| 546 { | |
| 547 for (o = E -> operands; o; o = o -> next) | |
| 548 lw_expr_destroy(o -> p); | |
| 549 if (E -> type == lw_expr_type_var) | |
| 550 lw_free(E -> value2); | |
| 551 *E = *te; | |
| 552 E -> operands = NULL; | |
| 553 | |
| 554 if (te -> type == lw_expr_type_var) | |
| 555 E -> value2 = lw_strdup(te -> value2); | |
| 556 for (o = te -> operands; o; o = o -> next) | |
| 557 { | |
| 558 lw_expr_add_operand(E, lw_expr_copy(o -> p)); | |
| 559 } | |
| 560 lw_expr_destroy(te); | |
| 561 goto again; | |
| 562 } | |
| 563 return; | |
| 564 } | |
| 565 | |
| 566 // non-operators have no simplification to do! | |
| 567 if (E -> type != lw_expr_type_oper) | |
| 568 return; | |
| 569 | |
| 371 | 570 // merge plus operations |
| 571 if (E -> value == lw_expr_oper_plus) | |
| 572 { | |
| 573 lw_expr_t e2; | |
| 574 | |
| 575 tryagainplus: | |
| 576 for (o = E -> operands; o; o = o -> next) | |
| 577 { | |
| 578 if (o -> p -> type == lw_expr_type_oper && o -> p -> value == lw_expr_oper_plus) | |
| 579 { | |
| 580 struct lw_expr_opers *o2, *o3; | |
| 581 // we have a + operation - bring operands up | |
| 582 | |
| 583 for (o2 = E -> operands; o2 && o2 -> next != o; o2 = o2 -> next) | |
| 584 /* do nothing */ ; | |
| 585 if (o2) | |
| 586 o2 -> next = o -> p -> operands; | |
| 587 else | |
| 588 E -> operands = o -> p -> operands; | |
| 589 for (o2 = o -> p -> operands; o2 -> next; o2 = o2 -> next) | |
| 590 /* do nothing */ ; | |
| 591 o2 -> next = o -> next; | |
| 592 o -> p -> operands = NULL; | |
| 593 lw_expr_destroy(o -> p); | |
| 594 lw_free(o); | |
| 595 goto tryagainplus; | |
| 596 } | |
| 597 } | |
| 598 } | |
| 599 | |
| 600 // merge times operations | |
| 601 if (E -> value == lw_expr_oper_times) | |
| 602 { | |
| 603 lw_expr_t e2; | |
| 604 | |
| 605 tryagaintimes: | |
| 606 for (o = E -> operands; o; o = o -> next) | |
| 607 { | |
| 608 if (o -> p -> type == lw_expr_type_oper && o -> p -> value == lw_expr_oper_times) | |
| 609 { | |
| 610 struct lw_expr_opers *o2, *o3; | |
| 611 // we have a + operation - bring operands up | |
| 612 | |
| 613 for (o2 = E -> operands; o2 && o2 -> next != o; o2 = o2 -> next) | |
| 614 /* do nothing */ ; | |
| 615 if (o2) | |
| 616 o2 -> next = o -> p -> operands; | |
| 617 else | |
| 618 E -> operands = o -> p -> operands; | |
| 619 for (o2 = o -> p -> operands; o2 -> next; o2 = o2 -> next) | |
| 620 /* do nothing */ ; | |
| 621 o2 -> next = o -> next; | |
| 622 o -> p -> operands = NULL; | |
| 623 lw_expr_destroy(o -> p); | |
| 624 lw_free(o); | |
| 625 goto tryagaintimes; | |
| 626 } | |
| 627 } | |
| 628 } | |
| 335 | 629 |
| 337 | 630 // simplify operands |
| 631 for (o = E -> operands; o; o = o -> next) | |
|
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Added expression parsing infrastructure and misc fixes
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diff
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|
632 lw_expr_simplify(o -> p, priv); |
| 337 | 633 |
| 634 for (o = E -> operands; o; o = o -> next) | |
| 635 { | |
| 636 if (o -> p -> type != lw_expr_type_int) | |
| 637 break; | |
| 638 } | |
| 639 | |
| 640 if (!o) | |
| 641 { | |
| 642 // we can do the operation here! | |
| 643 int tr = -42424242; | |
| 644 | |
| 645 switch (E -> value) | |
| 646 { | |
| 647 case lw_expr_oper_neg: | |
| 648 tr = -(E -> operands -> p -> value); | |
| 649 break; | |
| 650 | |
| 651 case lw_expr_oper_com: | |
| 652 tr = ~(E -> operands -> p -> value); | |
| 653 break; | |
| 654 | |
| 655 case lw_expr_oper_plus: | |
| 656 tr = E -> operands -> p -> value; | |
| 657 for (o = E -> operands -> next; o; o = o -> next) | |
| 658 tr += o -> p -> value; | |
| 659 break; | |
| 660 | |
| 661 case lw_expr_oper_minus: | |
| 662 tr = E -> operands -> p -> value; | |
| 663 for (o = E -> operands -> next; o; o = o -> next) | |
| 664 tr -= o -> p -> value; | |
| 665 break; | |
| 666 | |
| 667 case lw_expr_oper_times: | |
| 668 tr = E -> operands -> p -> value; | |
| 669 for (o = E -> operands -> next; o; o = o -> next) | |
| 670 tr *= o -> p -> value; | |
| 671 break; | |
| 672 | |
| 673 case lw_expr_oper_divide: | |
| 674 tr = E -> operands -> p -> value / E -> operands -> next -> p -> value; | |
| 675 break; | |
| 676 | |
| 677 case lw_expr_oper_mod: | |
| 678 tr = E -> operands -> p -> value % E -> operands -> next -> p -> value; | |
| 679 break; | |
| 680 | |
| 681 case lw_expr_oper_intdiv: | |
| 682 tr = E -> operands -> p -> value / E -> operands -> next -> p -> value; | |
| 683 break; | |
| 684 | |
| 685 case lw_expr_oper_bwand: | |
| 686 tr = E -> operands -> p -> value & E -> operands -> next -> p -> value; | |
| 687 break; | |
| 688 | |
| 689 case lw_expr_oper_bwor: | |
| 690 tr = E -> operands -> p -> value | E -> operands -> next -> p -> value; | |
| 691 break; | |
| 692 | |
| 693 case lw_expr_oper_bwxor: | |
| 694 tr = E -> operands -> p -> value ^ E -> operands -> next -> p -> value; | |
| 695 break; | |
| 696 | |
| 697 case lw_expr_oper_and: | |
| 698 tr = E -> operands -> p -> value && E -> operands -> next -> p -> value; | |
| 699 break; | |
| 700 | |
| 701 case lw_expr_oper_or: | |
| 702 tr = E -> operands -> p -> value || E -> operands -> next -> p -> value; | |
| 703 break; | |
| 704 | |
| 705 } | |
| 706 | |
| 707 while (E -> operands) | |
| 708 { | |
| 709 o = E -> operands; | |
| 710 E -> operands = o -> next; | |
| 711 lw_expr_destroy(o -> p); | |
| 712 lw_free(o); | |
| 713 } | |
| 714 E -> type = lw_expr_type_int; | |
| 715 E -> value = tr; | |
| 335 | 716 return; |
| 337 | 717 } |
| 335 | 718 |
| 371 | 719 if (E -> value == lw_expr_oper_plus) |
| 720 { | |
| 721 lw_expr_t e1; | |
| 722 int cval = 0; | |
| 723 | |
| 724 e1 = lw_expr_create(); | |
| 725 e1 -> operands = E -> operands; | |
| 726 E -> operands = 0; | |
| 727 | |
| 728 for (o = e1 -> operands; o; o = o -> next) | |
| 729 { | |
| 730 if (o -> p -> type == lw_expr_type_int) | |
| 731 cval += o -> p -> value; | |
| 732 else | |
| 733 lw_expr_add_operand(E, o -> p); | |
| 734 } | |
| 735 lw_expr_destroy(e1); | |
| 736 if (cval) | |
| 737 { | |
| 738 e1 = lw_expr_build(lw_expr_type_int, cval); | |
| 739 lw_expr_add_operand(E, e1); | |
| 740 lw_expr_destroy(e1); | |
| 741 } | |
| 742 } | |
| 743 | |
| 744 if (E -> value == lw_expr_oper_times) | |
| 745 { | |
| 746 lw_expr_t e1; | |
| 747 int cval = 1; | |
| 748 | |
| 749 e1 = lw_expr_create(); | |
| 750 e1 -> operands = E -> operands; | |
| 751 E -> operands = 0; | |
| 752 | |
| 753 for (o = e1 -> operands; o; o = o -> next) | |
| 754 { | |
| 755 if (o -> p -> type == lw_expr_type_int) | |
| 756 cval *= o -> p -> value; | |
| 757 else | |
| 758 lw_expr_add_operand(E, o -> p); | |
| 759 } | |
| 760 lw_expr_destroy(e1); | |
| 761 if (cval != 1) | |
| 762 { | |
| 763 e1 = lw_expr_build(lw_expr_type_int, cval); | |
| 764 lw_expr_add_operand(E, e1); | |
| 765 lw_expr_destroy(e1); | |
| 766 } | |
| 767 } | |
| 768 | |
| 335 | 769 if (E -> value == lw_expr_oper_times) |
| 770 { | |
| 771 for (o = E -> operands; o; o = o -> next) | |
| 772 { | |
| 773 if (o -> p -> type == lw_expr_type_int && o -> p -> value == 0) | |
| 774 { | |
| 775 // one operand of times is 0, replace operation with 0 | |
| 776 while (E -> operands) | |
| 777 { | |
| 778 o = E -> operands; | |
| 779 E -> operands = o -> next; | |
| 780 lw_expr_destroy(o -> p); | |
| 781 lw_free(o); | |
| 782 } | |
| 783 E -> type = lw_expr_type_int; | |
| 784 E -> value = 0; | |
| 785 return; | |
| 786 } | |
| 787 } | |
| 788 } | |
| 789 | |
| 371 | 790 // sort "constants" to the start of each operand list for + and * |
| 791 if (E -> value == lw_expr_oper_plus || E -> value == lw_expr_oper_times) | |
| 792 lw_expr_simplify_sortconstfirst(E); | |
| 793 | |
| 335 | 794 // look for like terms and collect them together |
| 795 if (E -> value == lw_expr_oper_plus) | |
| 796 { | |
| 371 | 797 struct lw_expr_opers *o2; |
| 335 | 798 for (o = E -> operands; o; o = o -> next) |
| 799 { | |
| 371 | 800 // skip constants |
| 801 if (o -> p -> type == lw_expr_type_int) | |
| 802 continue; | |
| 803 | |
| 804 // we have a term to match | |
| 805 // (o -> p) is first term | |
| 806 for (o2 = o -> next; o2; o2 = o2 -> next) | |
| 335 | 807 { |
| 371 | 808 lw_expr_t e1, e2; |
| 335 | 809 |
| 371 | 810 if (o2 -> p -> type == lw_expr_type_int) |
| 811 continue; | |
| 812 | |
| 813 if (lw_expr_simplify_isliketerm(o -> p, o2 -> p)) | |
| 335 | 814 { |
| 371 | 815 int coef, coef2; |
| 816 | |
| 817 // we have a like term here | |
| 818 // do something about it | |
| 819 if (o -> p -> type == lw_expr_type_oper && o -> p -> value == lw_expr_oper_times) | |
| 820 { | |
| 821 if (o -> p -> operands -> p -> type == lw_expr_type_int) | |
| 822 coef = o -> p -> operands -> p -> value; | |
| 823 else | |
| 824 coef = 1; | |
| 825 } | |
| 826 else | |
| 827 coef = 1; | |
| 335 | 828 if (o2 -> p -> type == lw_expr_type_oper && o2 -> p -> value == lw_expr_oper_times) |
| 829 { | |
| 371 | 830 if (o2 -> p -> operands -> p -> type == lw_expr_type_int) |
| 831 coef2 = o2 -> p -> operands -> p -> value; | |
| 832 else | |
| 833 coef2 = 1; | |
| 335 | 834 } |
| 371 | 835 else |
| 836 coef2 = 1; | |
| 837 coef += coef2; | |
| 838 e1 = lw_expr_create(); | |
| 839 e1 -> type = lw_expr_type_oper; | |
| 840 e1 -> value = lw_expr_oper_times; | |
| 841 if (coef != 1) | |
| 842 { | |
| 843 e2 = lw_expr_build(lw_expr_type_int, coef); | |
| 844 lw_expr_add_operand(e1, e2); | |
| 845 lw_expr_destroy(e2); | |
| 846 } | |
| 847 lw_expr_destroy(o -> p); | |
| 848 o -> p = e1; | |
| 849 for (o = o2 -> p -> operands; o; o = o -> next) | |
| 850 { | |
| 851 if (o -> p -> type == lw_expr_type_int) | |
| 852 continue; | |
| 853 lw_expr_add_operand(e1, o -> p); | |
| 854 } | |
| 855 lw_expr_destroy(o2 -> p); | |
| 856 o2 -> p = lw_expr_build(lw_expr_type_int, 0); | |
| 857 goto again; | |
| 335 | 858 } |
| 859 } | |
| 860 } | |
| 861 } | |
| 862 | |
| 863 | |
| 864 if (E -> value == lw_expr_oper_plus) | |
| 865 { | |
| 866 int c = 0, t = 0; | |
| 867 for (o = E -> operands; o; o = o -> next) | |
| 868 { | |
| 869 t++; | |
| 870 if (!(o -> p -> type == lw_expr_type_int && o -> p -> value == 0)) | |
| 871 { | |
| 872 c++; | |
| 873 } | |
| 874 } | |
| 875 if (c == 1) | |
| 876 { | |
| 877 lw_expr_t r; | |
| 878 // find the value and "move it up" | |
| 879 while (E -> operands) | |
| 880 { | |
| 881 o = E -> operands; | |
| 882 if (o -> p -> type != lw_expr_type_int || o -> p -> value != 0) | |
| 883 { | |
| 337 | 884 r = lw_expr_copy(o -> p); |
| 335 | 885 } |
| 886 E -> operands = o -> next; | |
| 887 lw_expr_destroy(o -> p); | |
| 888 lw_free(o); | |
| 889 } | |
| 890 *E = *r; | |
| 891 return; | |
| 892 } | |
| 893 else if (c == 0) | |
| 894 { | |
| 895 // replace with 0 | |
| 896 while (E -> operands) | |
| 897 { | |
| 898 o = E -> operands; | |
| 899 E -> operands = o -> next; | |
| 900 lw_expr_destroy(o -> p); | |
| 901 lw_free(o); | |
| 902 } | |
| 903 E -> type = lw_expr_type_int; | |
| 904 E -> value = 0; | |
| 905 return; | |
| 906 } | |
| 907 else if (c != t) | |
| 908 { | |
| 909 // collapse out zero terms | |
| 910 struct lw_expr_opers *o2; | |
| 911 | |
| 912 for (o = E -> operands; o; o = o -> next) | |
| 913 { | |
| 914 if (o -> p -> type == lw_expr_type_int && o -> p -> value == 0) | |
| 915 { | |
| 916 if (o == E -> operands) | |
| 917 { | |
| 918 E -> operands = o -> next; | |
| 919 lw_expr_destroy(o -> p); | |
| 920 lw_free(o); | |
| 921 o = E -> operands; | |
| 922 } | |
| 923 else | |
| 924 { | |
| 925 for (o2 = E -> operands; o2 -> next == o; o2 = o2 -> next) | |
| 926 /* do nothing */ ; | |
| 927 o2 -> next = o -> next; | |
| 928 lw_expr_destroy(o -> p); | |
| 929 lw_free(o); | |
| 930 o = o2; | |
| 931 } | |
| 932 } | |
| 933 } | |
| 934 } | |
| 935 return; | |
| 936 } | |
|
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937 |
|
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|
938 /* handle <int> times <plus> - expand the terms - only with exactly two operands */ |
|
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939 if (E -> value == lw_expr_oper_times) |
|
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940 { |
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|
941 lw_expr_t t1; |
|
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942 lw_expr_t E2; |
|
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943 lw_expr_t E3; |
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944 if (E -> operands && E -> operands -> next && !(E -> operands -> next -> next)) |
|
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|
945 { |
|
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946 if (E -> operands -> p -> type == lw_expr_type_int) |
|
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947 { |
|
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948 /* <int> TIMES <other> */ |
|
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949 E2 = E -> operands -> next -> p; |
|
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950 E3 = E -> operands -> p; |
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951 if (E2 -> type == lw_expr_type_oper && E2 -> value == lw_expr_oper_plus) |
|
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952 { |
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953 lw_free(E -> operands -> next); |
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954 lw_free(E -> operands); |
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955 E -> operands = NULL; |
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956 E -> value = lw_expr_oper_plus; |
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957 |
|
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958 for (o = E2 -> operands; o; o = o -> next) |
|
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959 { |
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960 t1 = lw_expr_build(lw_expr_type_oper, lw_expr_oper_times, E3, o -> p); |
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961 lw_expr_add_operand(E, t1); |
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962 } |
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963 |
|
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964 lw_expr_destroy(E2); |
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965 lw_expr_destroy(E3); |
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966 } |
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967 } |
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968 else if (E -> operands -> next -> p -> type == lw_expr_type_int) |
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969 { |
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970 /* <other> TIMES <int> */ |
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971 E2 = E -> operands -> p; |
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972 E3 = E -> operands -> next -> p; |
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973 if (E2 -> type == lw_expr_type_oper && E2 -> value == lw_expr_oper_plus) |
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974 { |
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975 lw_free(E -> operands -> next); |
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976 lw_free(E -> operands); |
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977 E -> operands = NULL; |
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978 E -> value = lw_expr_oper_plus; |
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979 |
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980 for (o = E2 -> operands; o; o = o -> next) |
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981 { |
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982 t1 = lw_expr_build(lw_expr_type_oper, lw_expr_oper_times, E3, o -> p); |
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983 lw_expr_add_operand(E, t1); |
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984 } |
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985 |
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986 lw_expr_destroy(E2); |
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987 lw_expr_destroy(E3); |
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988 } |
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989 } |
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990 } |
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991 } |
| 335 | 992 } |
|
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993 |
|
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994 void lw_expr_simplify(lw_expr_t E, void *priv) |
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995 { |
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996 lw_expr_t te; |
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997 int c; |
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998 do |
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999 { |
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1000 te = lw_expr_copy(E); |
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1001 lw_expr_simplify_go(E, priv); |
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1002 c = 0; |
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1003 if (lw_expr_compare(te, E) == 0) |
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1004 c = 1; |
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1005 lw_expr_destroy(te); |
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1006 } |
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1007 while (c); |
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1008 } |
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1009 |
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1010 |
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1011 /* |
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1012 |
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1013 The following two functions are co-routines which evaluate an infix |
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1014 expression. lw_expr_parse_term checks for unary prefix operators then, if |
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1015 none found, passes the string off the the defined helper function to |
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1016 determine what the term really is. It also handles parentheses. |
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1017 |
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1018 lw_expr_parse_expr evaluates actual expressions with infix operators. It |
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1019 respects the order of operations. |
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1020 |
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1021 The end of an expression is determined by the presence of any of the |
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1022 following conditions: |
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1023 |
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1024 1. a NUL character |
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1025 2. a whitespace character |
|
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342
diff
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|
1026 3. a ) |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1027 4. a , |
|
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Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1028 5. any character that is not recognized as a term |
|
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Added expression parsing infrastructure and misc fixes
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342
diff
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|
1029 |
|
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diff
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|
1030 lw_expr_parse_term returns NULL if there is no term (end of expr, etc.) |
|
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Added expression parsing infrastructure and misc fixes
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diff
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|
1031 |
|
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diff
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|
1032 lw_expr_parse_expr returns NULL if there is no expression or on a syntax |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1033 error. |
|
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Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1034 |
|
a82c55070624
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342
diff
changeset
|
1035 */ |
|
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Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1036 |
|
a82c55070624
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diff
changeset
|
1037 lw_expr_t lw_expr_parse_expr(char **p, void *priv, int prec); |
|
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Added expression parsing infrastructure and misc fixes
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342
diff
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|
1038 |
|
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diff
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|
1039 lw_expr_t lw_expr_parse_term(char **p, void *priv) |
|
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Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1040 { |
|
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Added expression parsing infrastructure and misc fixes
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342
diff
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|
1041 lw_expr_t term, term2; |
|
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342
diff
changeset
|
1042 |
|
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Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1043 eval_next: |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1044 if (!**p || isspace(**p) || **p == ')' || **p == ']') |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1045 return NULL; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1046 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1047 // parentheses |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1048 if (**p == '(') |
|
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Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1049 { |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1050 (*p)++; |
|
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Added expression parsing infrastructure and misc fixes
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diff
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|
1051 term = lw_expr_parse_expr(p, priv, 0); |
|
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Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1052 if (**p != ')') |
|
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Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1053 { |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1054 lw_expr_destroy(term); |
|
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Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1055 return NULL; |
|
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342
diff
changeset
|
1056 } |
|
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Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1057 (*p)++; |
|
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342
diff
changeset
|
1058 return term; |
|
a82c55070624
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342
diff
changeset
|
1059 } |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1060 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1061 // unary + |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1062 if (**p == '+') |
|
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Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1063 { |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1064 (*p)++; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1065 goto eval_next; |
|
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Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1066 } |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1067 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1068 // unary - (prec 200) |
|
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Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1069 if (**p == '-') |
|
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Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1070 { |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1071 (*p)++; |
|
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342
diff
changeset
|
1072 term = lw_expr_parse_expr(p, priv, 200); |
|
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342
diff
changeset
|
1073 if (!term) |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1074 return NULL; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1075 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1076 term2 = lw_expr_build(lw_expr_type_oper, lw_expr_oper_neg, term); |
|
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Added expression parsing infrastructure and misc fixes
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diff
changeset
|
1077 lw_expr_destroy(term); |
|
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Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1078 return term2; |
|
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Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1079 } |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1080 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1081 // unary ^ or ~ (complement, prec 200) |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1082 if (**p == '^' || **p == '~') |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1083 { |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1084 (*p)++; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1085 term = lw_expr_parse_expr(p, priv, 200); |
|
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342
diff
changeset
|
1086 if (!term) |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1087 return NULL; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1088 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1089 term2 = lw_expr_build(lw_expr_type_oper, lw_expr_oper_com, term); |
|
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Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1090 lw_expr_destroy(term); |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1091 return term2; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1092 } |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1093 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1094 // non-operator - pass to caller |
|
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Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1095 return parse_term(p, priv); |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1096 } |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1097 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1098 lw_expr_t lw_expr_parse_expr(char **p, void *priv, int prec) |
|
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Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1099 { |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1100 static const struct operinfo |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1101 { |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1102 int opernum; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1103 char *operstr; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1104 int operprec; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1105 } operators[] = |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1106 { |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1107 { lw_expr_oper_plus, "+", 100 }, |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1108 { lw_expr_oper_minus, "-", 100 }, |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1109 { lw_expr_oper_times, "*", 100 }, |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1110 { lw_expr_oper_divide, "/", 150 }, |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1111 { lw_expr_oper_mod, "%", 150 }, |
|
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Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1112 { lw_expr_oper_intdiv, "\\", 150 }, |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1113 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1114 { lw_expr_oper_and, "&&", 25 }, |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1115 { lw_expr_oper_or, "||", 25 }, |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1116 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1117 { lw_expr_oper_bwand, "&", 50 }, |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1118 { lw_expr_oper_bwor, "|", 50 }, |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1119 { lw_expr_oper_bwxor, "^", 50 }, |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1120 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1121 { lw_expr_oper_none, "", 0 } |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1122 }; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1123 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1124 int opern, i; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1125 lw_expr_t term1, term2, term3; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1126 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1127 if (!**p || isspace(**p) || **p == ')' || **p == ',' || **p == ']') |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1128 return NULL; |
| 370 | 1129 |
|
346
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1130 term1 = lw_expr_parse_term(p, priv); |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1131 if (!term1) |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1132 return NULL; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1133 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1134 eval_next: |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1135 if (!**p || isspace(**p) || **p == ')' || **p == ',' || **p == ']') |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1136 return term1; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1137 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1138 // expecting an operator here |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1139 for (opern = 0; operators[opern].opernum != lw_expr_oper_none; opern++) |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1140 { |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1141 for (i = 0; (*p)[i] && operators[opern].operstr[i] && ((*p)[i] == operators[opern].operstr[i]); i++) |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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342
diff
changeset
|
1142 /* do nothing */; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1143 if (operators[opern].operstr[i] == '\0') |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1144 break; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1145 } |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1146 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1147 if (operators[opern].opernum == lw_expr_oper_none) |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1148 { |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1149 // unrecognized operator |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1150 lw_expr_destroy(term1); |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1151 return NULL; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1152 } |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1153 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1154 // operator number is in opern, length of oper in i |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1155 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1156 // logic: |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1157 // if the precedence of this operation is <= to the "prec" flag, |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1158 // we simply return without advancing the input pointer; the operator |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1159 // will be evaluated again in the enclosing function call |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1160 if (operators[opern].operprec <= prec) |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1161 return term1; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1162 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1163 // logic: |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1164 // we have a higher precedence operator here so we will advance the |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1165 // input pointer to the next term and let the expression evaluator |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1166 // loose on it after which time we will push our operator onto the |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1167 // stack and then go on with the expression evaluation |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1168 (*p) += i; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1169 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1170 // evaluate next expression(s) of higher precedence |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
342
diff
changeset
|
1171 term2 = lw_expr_parse_expr(p, priv, operators[opern].operprec); |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1172 if (!term2) |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
342
diff
changeset
|
1173 { |
|
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1174 lw_expr_destroy(term1); |
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1175 return NULL; |
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1176 } |
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1177 |
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1178 // now create operator |
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1179 term3 = lw_expr_build(lw_expr_type_oper, operators[opern].opernum, term1, term2); |
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1180 lw_expr_destroy(term1); |
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1181 lw_expr_destroy(term2); |
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1182 |
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1183 // the new "expression" is the next "left operand" |
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1184 term1 = term3; |
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1185 |
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1186 // continue evaluating |
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1187 goto eval_next; |
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1188 } |
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1189 |
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1190 lw_expr_t lw_expr_parse(char **p, void *priv) |
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1191 { |
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1192 return lw_expr_parse_expr(p, priv, 0); |
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1193 } |
| 367 | 1194 |
| 1195 int lw_expr_testterms(lw_expr_t e, lw_expr_testfn_t *fn, void *priv) | |
| 1196 { | |
| 1197 struct lw_expr_opers *o; | |
| 1198 int r; | |
| 1199 | |
| 1200 for (o = e -> operands; o; o = o -> next) | |
| 1201 { | |
| 1202 r = lw_expr_testterms(o -> p, fn, priv); | |
| 1203 if (r) | |
| 1204 return r; | |
| 1205 } | |
| 1206 return (fn)(e, priv); | |
| 1207 } | |
| 376 | 1208 |
| 1209 int lw_expr_type(lw_expr_t e) | |
| 1210 { | |
| 1211 return e -> type; | |
| 1212 } | |
| 1213 | |
| 1214 void *lw_expr_specptr(lw_expr_t e) | |
| 1215 { | |
| 1216 return e -> value2; | |
| 1217 } |