| 1 | /* |
| 2 | * tclExpr.c -- |
| 3 | * |
| 4 | * This file contains the code to evaluate expressions for |
| 5 | * Tcl. |
| 6 | * |
| 7 | * This implementation of floating-point support was modelled |
| 8 | * after an initial implementation by Bill Carpenter. |
| 9 | * |
| 10 | * Copyright 1987-1991 Regents of the University of California |
| 11 | * Permission to use, copy, modify, and distribute this |
| 12 | * software and its documentation for any purpose and without |
| 13 | * fee is hereby granted, provided that the above copyright |
| 14 | * notice appear in all copies. The University of California |
| 15 | * makes no representations about the suitability of this |
| 16 | * software for any purpose. It is provided "as is" without |
| 17 | * express or implied warranty. |
| 18 | */ |
| 19 | |
| 20 | #ifndef lint |
| 21 | static char rcsid[] = "$Header: /user6/ouster/tcl/RCS/tclExpr.c,v 1.35 92/03/23 09:53:46 ouster Exp $ SPRITE (Berkeley)"; |
| 22 | #endif |
| 23 | |
| 24 | #include "tclint.h" |
| 25 | |
| 26 | /* |
| 27 | * The stuff below is a bit of a workaround so that this file can be used |
| 28 | * in environments that include no UNIX, i.e. no errno. Just define |
| 29 | * errno here. |
| 30 | */ |
| 31 | |
| 32 | #ifndef TCL_GENERIC_ONLY |
| 33 | #include "tclunix.h" |
| 34 | #else |
| 35 | int errno; |
| 36 | #define ERANGE 34 |
| 37 | #endif |
| 38 | |
| 39 | /* |
| 40 | * The data structure below is used to describe an expression value, |
| 41 | * which can be either an integer (the usual case), a double-precision |
| 42 | * floating-point value, or a string. A given number has only one |
| 43 | * value at a time. |
| 44 | */ |
| 45 | |
| 46 | #define STATIC_STRING_SPACE 150 |
| 47 | |
| 48 | typedef struct { |
| 49 | long intValue; /* Integer value, if any. */ |
| 50 | double doubleValue; /* Floating-point value, if any. */ |
| 51 | ParseValue pv; /* Used to hold a string value, if any. */ |
| 52 | char staticSpace[STATIC_STRING_SPACE]; |
| 53 | /* Storage for small strings; large ones |
| 54 | * are malloc-ed. */ |
| 55 | int type; /* Type of value: TYPE_INT, TYPE_DOUBLE, |
| 56 | * or TYPE_STRING. */ |
| 57 | } Value; |
| 58 | |
| 59 | /* |
| 60 | * Valid values for type: |
| 61 | */ |
| 62 | |
| 63 | #define TYPE_INT 0 |
| 64 | #define TYPE_DOUBLE 1 |
| 65 | #define TYPE_STRING 2 |
| 66 | |
| 67 | |
| 68 | /* |
| 69 | * The data structure below describes the state of parsing an expression. |
| 70 | * It's passed among the routines in this module. |
| 71 | */ |
| 72 | |
| 73 | typedef struct { |
| 74 | char *originalExpr; /* The entire expression, as originally |
| 75 | * passed to Tcl_Expr. */ |
| 76 | char *expr; /* Position to the next character to be |
| 77 | * scanned from the expression string. */ |
| 78 | int token; /* Type of the last token to be parsed from |
| 79 | * expr. See below for definitions. |
| 80 | * Corresponds to the characters just |
| 81 | * before expr. */ |
| 82 | } ExprInfo; |
| 83 | |
| 84 | /* |
| 85 | * The token types are defined below. In addition, there is a table |
| 86 | * associating a precedence with each operator. The order of types |
| 87 | * is important. Consult the code before changing it. |
| 88 | */ |
| 89 | |
| 90 | #define VALUE 0 |
| 91 | #define OPEN_PAREN 1 |
| 92 | #define CLOSE_PAREN 2 |
| 93 | #define END 3 |
| 94 | #define UNKNOWN 4 |
| 95 | |
| 96 | /* |
| 97 | * Binary operators: |
| 98 | */ |
| 99 | |
| 100 | #define MULT 8 |
| 101 | #define DIVIDE 9 |
| 102 | #define MOD 10 |
| 103 | #define PLUS 11 |
| 104 | #define MINUS 12 |
| 105 | #define LEFT_SHIFT 13 |
| 106 | #define RIGHT_SHIFT 14 |
| 107 | #define LESS 15 |
| 108 | #define GREATER 16 |
| 109 | #define LEQ 17 |
| 110 | #define GEQ 18 |
| 111 | #define EQUAL 19 |
| 112 | #define NEQ 20 |
| 113 | #define BIT_AND 21 |
| 114 | #define BIT_XOR 22 |
| 115 | #define BIT_OR 23 |
| 116 | #define AND 24 |
| 117 | #define OR 25 |
| 118 | #define QUESTY 26 |
| 119 | #define COLON 27 |
| 120 | |
| 121 | /* |
| 122 | * Unary operators: |
| 123 | */ |
| 124 | |
| 125 | #define UNARY_MINUS 28 |
| 126 | #define NOT 29 |
| 127 | #define BIT_NOT 30 |
| 128 | |
| 129 | /* |
| 130 | * Precedence table. The values for non-operator token types are ignored. |
| 131 | */ |
| 132 | |
| 133 | int precTable[] = { |
| 134 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 135 | 11, 11, 11, /* MULT, DIVIDE, MOD */ |
| 136 | 10, 10, /* PLUS, MINUS */ |
| 137 | 9, 9, /* LEFT_SHIFT, RIGHT_SHIFT */ |
| 138 | 8, 8, 8, 8, /* LESS, GREATER, LEQ, GEQ */ |
| 139 | 7, 7, /* EQUAL, NEQ */ |
| 140 | 6, /* BIT_AND */ |
| 141 | 5, /* BIT_XOR */ |
| 142 | 4, /* BIT_OR */ |
| 143 | 3, /* AND */ |
| 144 | 2, /* OR */ |
| 145 | 1, 1, /* QUESTY, COLON */ |
| 146 | 12, 12, 12 /* UNARY_MINUS, NOT, BIT_NOT */ |
| 147 | }; |
| 148 | |
| 149 | /* |
| 150 | * Mapping from operator numbers to strings; used for error messages. |
| 151 | */ |
| 152 | |
| 153 | char *operatorStrings[] = { |
| 154 | "VALUE", "(", ")", "END", "UNKNOWN", "5", "6", "7", |
| 155 | "*", "/", "%", "+", "-", "<<", ">>", "<", ">", "<=", |
| 156 | ">=", "==", "!=", "&", "^", "|", "&&", "||", "?", ":", |
| 157 | "-", "!", "~" |
| 158 | }; |
| 159 | |
| 160 | /* |
| 161 | * Declarations for local procedures to this file: |
| 162 | */ |
| 163 | |
| 164 | static int ExprGetValue _ANSI_ARGS_((Tcl_Interp *interp, |
| 165 | ExprInfo *infoPtr, int prec, Value *valuePtr)); |
| 166 | static int ExprLex _ANSI_ARGS_((Tcl_Interp *interp, |
| 167 | ExprInfo *infoPtr, Value *valuePtr)); |
| 168 | static void ExprMakeString _ANSI_ARGS_((Value *valuePtr)); |
| 169 | static int ExprParseString _ANSI_ARGS_((Tcl_Interp *interp, |
| 170 | char *string, Value *valuePtr)); |
| 171 | static int ExprTopLevel _ANSI_ARGS_((Tcl_Interp *interp, |
| 172 | char *string, Value *valuePtr)); |
| 173 | \f |
| 174 | /* |
| 175 | *-------------------------------------------------------------- |
| 176 | * |
| 177 | * ExprParseString -- |
| 178 | * |
| 179 | * Given a string (such as one coming from command or variable |
| 180 | * substitution), make a Value based on the string. The value |
| 181 | * will be a floating-point or integer, if possible, or else it |
| 182 | * will just be a copy of the string. |
| 183 | * |
| 184 | * Results: |
| 185 | * TCL_OK is returned under normal circumstances, and TCL_ERROR |
| 186 | * is returned if a floating-point overflow or underflow occurred |
| 187 | * while reading in a number. The value at *valuePtr is modified |
| 188 | * to hold a number, if possible. |
| 189 | * |
| 190 | * Side effects: |
| 191 | * None. |
| 192 | * |
| 193 | *-------------------------------------------------------------- |
| 194 | */ |
| 195 | |
| 196 | static int |
| 197 | ExprParseString(interp, string, valuePtr) |
| 198 | Tcl_Interp *interp; /* Where to store error message. */ |
| 199 | char *string; /* String to turn into value. */ |
| 200 | Value *valuePtr; /* Where to store value information. |
| 201 | * Caller must have initialized pv field. */ |
| 202 | { |
| 203 | register char c; |
| 204 | |
| 205 | /* |
| 206 | * Try to convert the string to a number. |
| 207 | */ |
| 208 | |
| 209 | c = *string; |
| 210 | if (((c >= '0') && (c <= '9')) || (c == '-') || (c == '.')) { |
| 211 | char *term; |
| 212 | |
| 213 | valuePtr->type = TYPE_INT; |
| 214 | errno = 0; |
| 215 | valuePtr->intValue = strtol(string, &term, 0); |
| 216 | c = *term; |
| 217 | if ((c == '\0') && (errno != ERANGE)) { |
| 218 | return TCL_OK; |
| 219 | } |
| 220 | if ((c == '.') || (c == 'e') || (c == 'E') || (errno == ERANGE)) { |
| 221 | errno = 0; |
| 222 | valuePtr->doubleValue = strtod(string, &term); |
| 223 | if (errno == ERANGE) { |
| 224 | Tcl_ResetResult(interp); |
| 225 | if (valuePtr->doubleValue == 0.0) { |
| 226 | Tcl_AppendResult(interp, "floating-point value \"", |
| 227 | string, "\" too small to represent", |
| 228 | (char *) NULL); |
| 229 | } else { |
| 230 | Tcl_AppendResult(interp, "floating-point value \"", |
| 231 | string, "\" too large to represent", |
| 232 | (char *) NULL); |
| 233 | } |
| 234 | return TCL_ERROR; |
| 235 | } |
| 236 | if (*term == '\0') { |
| 237 | valuePtr->type = TYPE_DOUBLE; |
| 238 | return TCL_OK; |
| 239 | } |
| 240 | } |
| 241 | } |
| 242 | |
| 243 | /* |
| 244 | * Not a valid number. Save a string value (but don't do anything |
| 245 | * if it's already the value). |
| 246 | */ |
| 247 | |
| 248 | valuePtr->type = TYPE_STRING; |
| 249 | if (string != valuePtr->pv.buffer) { |
| 250 | int length, shortfall; |
| 251 | |
| 252 | length = strlen(string); |
| 253 | valuePtr->pv.next = valuePtr->pv.buffer; |
| 254 | shortfall = length - (valuePtr->pv.end - valuePtr->pv.buffer); |
| 255 | if (shortfall > 0) { |
| 256 | (*valuePtr->pv.expandProc)(&valuePtr->pv, shortfall); |
| 257 | } |
| 258 | strcpy(valuePtr->pv.buffer, string); |
| 259 | } |
| 260 | return TCL_OK; |
| 261 | } |
| 262 | \f |
| 263 | /* |
| 264 | *---------------------------------------------------------------------- |
| 265 | * |
| 266 | * ExprLex -- |
| 267 | * |
| 268 | * Lexical analyzer for expression parser: parses a single value, |
| 269 | * operator, or other syntactic element from an expression string. |
| 270 | * |
| 271 | * Results: |
| 272 | * TCL_OK is returned unless an error occurred while doing lexical |
| 273 | * analysis or executing an embedded command. In that case a |
| 274 | * standard Tcl error is returned, using interp->result to hold |
| 275 | * an error message. In the event of a successful return, the token |
| 276 | * and field in infoPtr is updated to refer to the next symbol in |
| 277 | * the expression string, and the expr field is advanced past that |
| 278 | * token; if the token is a value, then the value is stored at |
| 279 | * valuePtr. |
| 280 | * |
| 281 | * Side effects: |
| 282 | * None. |
| 283 | * |
| 284 | *---------------------------------------------------------------------- |
| 285 | */ |
| 286 | |
| 287 | static int |
| 288 | ExprLex(interp, infoPtr, valuePtr) |
| 289 | Tcl_Interp *interp; /* Interpreter to use for error |
| 290 | * reporting. */ |
| 291 | register ExprInfo *infoPtr; /* Describes the state of the parse. */ |
| 292 | register Value *valuePtr; /* Where to store value, if that is |
| 293 | * what's parsed from string. Caller |
| 294 | * must have initialized pv field |
| 295 | * correctly. */ |
| 296 | { |
| 297 | register char *p, c; |
| 298 | char *var, *term; |
| 299 | int result; |
| 300 | |
| 301 | p = infoPtr->expr; |
| 302 | c = *p; |
| 303 | while (isspace(c)) { |
| 304 | p++; |
| 305 | c = *p; |
| 306 | } |
| 307 | infoPtr->expr = p+1; |
| 308 | switch (c) { |
| 309 | case '0': |
| 310 | case '1': |
| 311 | case '2': |
| 312 | case '3': |
| 313 | case '4': |
| 314 | case '5': |
| 315 | case '6': |
| 316 | case '7': |
| 317 | case '8': |
| 318 | case '9': |
| 319 | case '.': |
| 320 | |
| 321 | /* |
| 322 | * Number. First read an integer. Then if it looks like |
| 323 | * there's a floating-point number (or if it's too big a |
| 324 | * number to fit in an integer), parse it as a floating-point |
| 325 | * number. |
| 326 | */ |
| 327 | |
| 328 | infoPtr->token = VALUE; |
| 329 | valuePtr->type = TYPE_INT; |
| 330 | errno = 0; |
| 331 | valuePtr->intValue = strtoul(p, &term, 0); |
| 332 | c = *term; |
| 333 | if ((c == '.') || (c == 'e') || (c == 'E') || (errno == ERANGE)) { |
| 334 | char *term2; |
| 335 | |
| 336 | errno = 0; |
| 337 | valuePtr->doubleValue = strtod(p, &term2); |
| 338 | if (errno == ERANGE) { |
| 339 | Tcl_ResetResult(interp); |
| 340 | if (valuePtr->doubleValue == 0.0) { |
| 341 | interp->result = |
| 342 | "floating-point value too small to represent"; |
| 343 | } else { |
| 344 | interp->result = |
| 345 | "floating-point value too large to represent"; |
| 346 | } |
| 347 | return TCL_ERROR; |
| 348 | } |
| 349 | if (term2 == infoPtr->expr) { |
| 350 | interp->result = "poorly-formed floating-point value"; |
| 351 | return TCL_ERROR; |
| 352 | } |
| 353 | valuePtr->type = TYPE_DOUBLE; |
| 354 | infoPtr->expr = term2; |
| 355 | } else { |
| 356 | infoPtr->expr = term; |
| 357 | } |
| 358 | return TCL_OK; |
| 359 | |
| 360 | case '$': |
| 361 | |
| 362 | /* |
| 363 | * Variable. Fetch its value, then see if it makes sense |
| 364 | * as an integer or floating-point number. |
| 365 | */ |
| 366 | |
| 367 | infoPtr->token = VALUE; |
| 368 | var = Tcl_ParseVar(interp, p, &infoPtr->expr); |
| 369 | if (var == NULL) { |
| 370 | return TCL_ERROR; |
| 371 | } |
| 372 | if (((Interp *) interp)->noEval) { |
| 373 | valuePtr->type = TYPE_INT; |
| 374 | valuePtr->intValue = 0; |
| 375 | return TCL_OK; |
| 376 | } |
| 377 | return ExprParseString(interp, var, valuePtr); |
| 378 | |
| 379 | case '[': |
| 380 | infoPtr->token = VALUE; |
| 381 | result = Tcl_Eval(interp, p+1, TCL_BRACKET_TERM, |
| 382 | &infoPtr->expr); |
| 383 | if (result != TCL_OK) { |
| 384 | return result; |
| 385 | } |
| 386 | infoPtr->expr++; |
| 387 | if (((Interp *) interp)->noEval) { |
| 388 | valuePtr->type = TYPE_INT; |
| 389 | valuePtr->intValue = 0; |
| 390 | Tcl_ResetResult(interp); |
| 391 | return TCL_OK; |
| 392 | } |
| 393 | result = ExprParseString(interp, interp->result, valuePtr); |
| 394 | if (result != TCL_OK) { |
| 395 | return result; |
| 396 | } |
| 397 | Tcl_ResetResult(interp); |
| 398 | return TCL_OK; |
| 399 | |
| 400 | case '"': |
| 401 | infoPtr->token = VALUE; |
| 402 | result = TclParseQuotes(interp, infoPtr->expr, '"', 0, |
| 403 | &infoPtr->expr, &valuePtr->pv); |
| 404 | if (result != TCL_OK) { |
| 405 | return result; |
| 406 | } |
| 407 | return ExprParseString(interp, valuePtr->pv.buffer, valuePtr); |
| 408 | |
| 409 | case '{': |
| 410 | infoPtr->token = VALUE; |
| 411 | result = TclParseBraces(interp, infoPtr->expr, &infoPtr->expr, |
| 412 | &valuePtr->pv); |
| 413 | if (result != TCL_OK) { |
| 414 | return result; |
| 415 | } |
| 416 | return ExprParseString(interp, valuePtr->pv.buffer, valuePtr); |
| 417 | |
| 418 | case '(': |
| 419 | infoPtr->token = OPEN_PAREN; |
| 420 | return TCL_OK; |
| 421 | |
| 422 | case ')': |
| 423 | infoPtr->token = CLOSE_PAREN; |
| 424 | return TCL_OK; |
| 425 | |
| 426 | case '*': |
| 427 | infoPtr->token = MULT; |
| 428 | return TCL_OK; |
| 429 | |
| 430 | case '/': |
| 431 | infoPtr->token = DIVIDE; |
| 432 | return TCL_OK; |
| 433 | |
| 434 | case '%': |
| 435 | infoPtr->token = MOD; |
| 436 | return TCL_OK; |
| 437 | |
| 438 | case '+': |
| 439 | infoPtr->token = PLUS; |
| 440 | return TCL_OK; |
| 441 | |
| 442 | case '-': |
| 443 | infoPtr->token = MINUS; |
| 444 | return TCL_OK; |
| 445 | |
| 446 | case '?': |
| 447 | infoPtr->token = QUESTY; |
| 448 | return TCL_OK; |
| 449 | |
| 450 | case ':': |
| 451 | infoPtr->token = COLON; |
| 452 | return TCL_OK; |
| 453 | |
| 454 | case '<': |
| 455 | switch (p[1]) { |
| 456 | case '<': |
| 457 | infoPtr->expr = p+2; |
| 458 | infoPtr->token = LEFT_SHIFT; |
| 459 | break; |
| 460 | case '=': |
| 461 | infoPtr->expr = p+2; |
| 462 | infoPtr->token = LEQ; |
| 463 | break; |
| 464 | default: |
| 465 | infoPtr->token = LESS; |
| 466 | break; |
| 467 | } |
| 468 | return TCL_OK; |
| 469 | |
| 470 | case '>': |
| 471 | switch (p[1]) { |
| 472 | case '>': |
| 473 | infoPtr->expr = p+2; |
| 474 | infoPtr->token = RIGHT_SHIFT; |
| 475 | break; |
| 476 | case '=': |
| 477 | infoPtr->expr = p+2; |
| 478 | infoPtr->token = GEQ; |
| 479 | break; |
| 480 | default: |
| 481 | infoPtr->token = GREATER; |
| 482 | break; |
| 483 | } |
| 484 | return TCL_OK; |
| 485 | |
| 486 | case '=': |
| 487 | if (p[1] == '=') { |
| 488 | infoPtr->expr = p+2; |
| 489 | infoPtr->token = EQUAL; |
| 490 | } else { |
| 491 | infoPtr->token = UNKNOWN; |
| 492 | } |
| 493 | return TCL_OK; |
| 494 | |
| 495 | case '!': |
| 496 | if (p[1] == '=') { |
| 497 | infoPtr->expr = p+2; |
| 498 | infoPtr->token = NEQ; |
| 499 | } else { |
| 500 | infoPtr->token = NOT; |
| 501 | } |
| 502 | return TCL_OK; |
| 503 | |
| 504 | case '&': |
| 505 | if (p[1] == '&') { |
| 506 | infoPtr->expr = p+2; |
| 507 | infoPtr->token = AND; |
| 508 | } else { |
| 509 | infoPtr->token = BIT_AND; |
| 510 | } |
| 511 | return TCL_OK; |
| 512 | |
| 513 | case '^': |
| 514 | infoPtr->token = BIT_XOR; |
| 515 | return TCL_OK; |
| 516 | |
| 517 | case '|': |
| 518 | if (p[1] == '|') { |
| 519 | infoPtr->expr = p+2; |
| 520 | infoPtr->token = OR; |
| 521 | } else { |
| 522 | infoPtr->token = BIT_OR; |
| 523 | } |
| 524 | return TCL_OK; |
| 525 | |
| 526 | case '~': |
| 527 | infoPtr->token = BIT_NOT; |
| 528 | return TCL_OK; |
| 529 | |
| 530 | case 0: |
| 531 | infoPtr->token = END; |
| 532 | infoPtr->expr = p; |
| 533 | return TCL_OK; |
| 534 | |
| 535 | default: |
| 536 | infoPtr->expr = p+1; |
| 537 | infoPtr->token = UNKNOWN; |
| 538 | return TCL_OK; |
| 539 | } |
| 540 | } |
| 541 | \f |
| 542 | /* |
| 543 | *---------------------------------------------------------------------- |
| 544 | * |
| 545 | * ExprGetValue -- |
| 546 | * |
| 547 | * Parse a "value" from the remainder of the expression in infoPtr. |
| 548 | * |
| 549 | * Results: |
| 550 | * Normally TCL_OK is returned. The value of the expression is |
| 551 | * returned in *valuePtr. If an error occurred, then interp->result |
| 552 | * contains an error message and TCL_ERROR is returned. |
| 553 | * InfoPtr->token will be left pointing to the token AFTER the |
| 554 | * expression, and infoPtr->expr will point to the character just |
| 555 | * after the terminating token. |
| 556 | * |
| 557 | * Side effects: |
| 558 | * None. |
| 559 | * |
| 560 | *---------------------------------------------------------------------- |
| 561 | */ |
| 562 | |
| 563 | static int |
| 564 | ExprGetValue(interp, infoPtr, prec, valuePtr) |
| 565 | Tcl_Interp *interp; /* Interpreter to use for error |
| 566 | * reporting. */ |
| 567 | register ExprInfo *infoPtr; /* Describes the state of the parse |
| 568 | * just before the value (i.e. ExprLex |
| 569 | * will be called to get first token |
| 570 | * of value). */ |
| 571 | int prec; /* Treat any un-parenthesized operator |
| 572 | * with precedence <= this as the end |
| 573 | * of the expression. */ |
| 574 | Value *valuePtr; /* Where to store the value of the |
| 575 | * expression. Caller must have |
| 576 | * initialized pv field. */ |
| 577 | { |
| 578 | Interp *iPtr = (Interp *) interp; |
| 579 | Value value2; /* Second operand for current |
| 580 | * operator. */ |
| 581 | int operator; /* Current operator (either unary |
| 582 | * or binary). */ |
| 583 | int badType; /* Type of offending argument; used |
| 584 | * for error messages. */ |
| 585 | int gotOp; /* Non-zero means already lexed the |
| 586 | * operator (while picking up value |
| 587 | * for unary operator). Don't lex |
| 588 | * again. */ |
| 589 | int result; |
| 590 | |
| 591 | /* |
| 592 | * There are two phases to this procedure. First, pick off an initial |
| 593 | * value. Then, parse (binary operator, value) pairs until done. |
| 594 | */ |
| 595 | |
| 596 | gotOp = 0; |
| 597 | value2.pv.buffer = value2.pv.next = value2.staticSpace; |
| 598 | value2.pv.end = value2.pv.buffer + STATIC_STRING_SPACE - 1; |
| 599 | value2.pv.expandProc = TclExpandParseValue; |
| 600 | value2.pv.clientData = (ClientData) NULL; |
| 601 | result = ExprLex(interp, infoPtr, valuePtr); |
| 602 | if (result != TCL_OK) { |
| 603 | goto done; |
| 604 | } |
| 605 | if (infoPtr->token == OPEN_PAREN) { |
| 606 | |
| 607 | /* |
| 608 | * Parenthesized sub-expression. |
| 609 | */ |
| 610 | |
| 611 | result = ExprGetValue(interp, infoPtr, -1, valuePtr); |
| 612 | if (result != TCL_OK) { |
| 613 | goto done; |
| 614 | } |
| 615 | if (infoPtr->token != CLOSE_PAREN) { |
| 616 | Tcl_ResetResult(interp); |
| 617 | sprintf(interp->result, |
| 618 | "unmatched parentheses in expression \"%.50s\"", |
| 619 | infoPtr->originalExpr); |
| 620 | result = TCL_ERROR; |
| 621 | goto done; |
| 622 | } |
| 623 | } else { |
| 624 | if (infoPtr->token == MINUS) { |
| 625 | infoPtr->token = UNARY_MINUS; |
| 626 | } |
| 627 | if (infoPtr->token >= UNARY_MINUS) { |
| 628 | |
| 629 | /* |
| 630 | * Process unary operators. |
| 631 | */ |
| 632 | |
| 633 | operator = infoPtr->token; |
| 634 | result = ExprGetValue(interp, infoPtr, precTable[infoPtr->token], |
| 635 | valuePtr); |
| 636 | if (result != TCL_OK) { |
| 637 | goto done; |
| 638 | } |
| 639 | switch (operator) { |
| 640 | case UNARY_MINUS: |
| 641 | if (valuePtr->type == TYPE_INT) { |
| 642 | valuePtr->intValue = -valuePtr->intValue; |
| 643 | } else if (valuePtr->type == TYPE_DOUBLE){ |
| 644 | valuePtr->doubleValue = -valuePtr->doubleValue; |
| 645 | } else { |
| 646 | badType = valuePtr->type; |
| 647 | goto illegalType; |
| 648 | } |
| 649 | break; |
| 650 | case NOT: |
| 651 | if (valuePtr->type == TYPE_INT) { |
| 652 | valuePtr->intValue = !valuePtr->intValue; |
| 653 | } else if (valuePtr->type == TYPE_DOUBLE) { |
| 654 | /* |
| 655 | * Theoretically, should be able to use |
| 656 | * "!valuePtr->intValue", but apparently some |
| 657 | * compilers can't handle it. |
| 658 | */ |
| 659 | if (valuePtr->doubleValue == 0.0) { |
| 660 | valuePtr->intValue = 1; |
| 661 | } else { |
| 662 | valuePtr->intValue = 0; |
| 663 | } |
| 664 | valuePtr->type = TYPE_INT; |
| 665 | } else { |
| 666 | badType = valuePtr->type; |
| 667 | goto illegalType; |
| 668 | } |
| 669 | break; |
| 670 | case BIT_NOT: |
| 671 | if (valuePtr->type == TYPE_INT) { |
| 672 | valuePtr->intValue = ~valuePtr->intValue; |
| 673 | } else { |
| 674 | badType = valuePtr->type; |
| 675 | goto illegalType; |
| 676 | } |
| 677 | break; |
| 678 | } |
| 679 | gotOp = 1; |
| 680 | } else if (infoPtr->token != VALUE) { |
| 681 | goto syntaxError; |
| 682 | } |
| 683 | } |
| 684 | |
| 685 | /* |
| 686 | * Got the first operand. Now fetch (operator, operand) pairs. |
| 687 | */ |
| 688 | |
| 689 | if (!gotOp) { |
| 690 | result = ExprLex(interp, infoPtr, &value2); |
| 691 | if (result != TCL_OK) { |
| 692 | goto done; |
| 693 | } |
| 694 | } |
| 695 | while (1) { |
| 696 | operator = infoPtr->token; |
| 697 | value2.pv.next = value2.pv.buffer; |
| 698 | if ((operator < MULT) || (operator >= UNARY_MINUS)) { |
| 699 | if ((operator == END) || (operator == CLOSE_PAREN)) { |
| 700 | result = TCL_OK; |
| 701 | goto done; |
| 702 | } else { |
| 703 | goto syntaxError; |
| 704 | } |
| 705 | } |
| 706 | if (precTable[operator] <= prec) { |
| 707 | result = TCL_OK; |
| 708 | goto done; |
| 709 | } |
| 710 | |
| 711 | /* |
| 712 | * If we're doing an AND or OR and the first operand already |
| 713 | * determines the result, don't execute anything in the |
| 714 | * second operand: just parse. Same style for ?: pairs. |
| 715 | */ |
| 716 | |
| 717 | if ((operator == AND) || (operator == OR) || (operator == QUESTY)) { |
| 718 | if (valuePtr->type == TYPE_DOUBLE) { |
| 719 | valuePtr->intValue = valuePtr->doubleValue != 0; |
| 720 | valuePtr->type = TYPE_INT; |
| 721 | } else if (valuePtr->type == TYPE_STRING) { |
| 722 | badType = TYPE_STRING; |
| 723 | goto illegalType; |
| 724 | } |
| 725 | if (((operator == AND) && !valuePtr->intValue) |
| 726 | || ((operator == OR) && valuePtr->intValue)) { |
| 727 | iPtr->noEval++; |
| 728 | result = ExprGetValue(interp, infoPtr, precTable[operator], |
| 729 | &value2); |
| 730 | iPtr->noEval--; |
| 731 | } else if (operator == QUESTY) { |
| 732 | if (valuePtr->intValue != 0) { |
| 733 | valuePtr->pv.next = valuePtr->pv.buffer; |
| 734 | result = ExprGetValue(interp, infoPtr, precTable[operator], |
| 735 | valuePtr); |
| 736 | if (result != TCL_OK) { |
| 737 | goto done; |
| 738 | } |
| 739 | if (infoPtr->token != COLON) { |
| 740 | goto syntaxError; |
| 741 | } |
| 742 | value2.pv.next = value2.pv.buffer; |
| 743 | iPtr->noEval++; |
| 744 | result = ExprGetValue(interp, infoPtr, precTable[operator], |
| 745 | &value2); |
| 746 | iPtr->noEval--; |
| 747 | } else { |
| 748 | iPtr->noEval++; |
| 749 | result = ExprGetValue(interp, infoPtr, precTable[operator], |
| 750 | &value2); |
| 751 | iPtr->noEval--; |
| 752 | if (result != TCL_OK) { |
| 753 | goto done; |
| 754 | } |
| 755 | if (infoPtr->token != COLON) { |
| 756 | goto syntaxError; |
| 757 | } |
| 758 | valuePtr->pv.next = valuePtr->pv.buffer; |
| 759 | result = ExprGetValue(interp, infoPtr, precTable[operator], |
| 760 | valuePtr); |
| 761 | } |
| 762 | } else { |
| 763 | result = ExprGetValue(interp, infoPtr, precTable[operator], |
| 764 | &value2); |
| 765 | } |
| 766 | } else { |
| 767 | result = ExprGetValue(interp, infoPtr, precTable[operator], |
| 768 | &value2); |
| 769 | } |
| 770 | if (result != TCL_OK) { |
| 771 | goto done; |
| 772 | } |
| 773 | if ((infoPtr->token < MULT) && (infoPtr->token != VALUE) |
| 774 | && (infoPtr->token != END) |
| 775 | && (infoPtr->token != CLOSE_PAREN)) { |
| 776 | goto syntaxError; |
| 777 | } |
| 778 | |
| 779 | /* |
| 780 | * At this point we've got two values and an operator. Check |
| 781 | * to make sure that the particular data types are appropriate |
| 782 | * for the particular operator, and perform type conversion |
| 783 | * if necessary. |
| 784 | */ |
| 785 | |
| 786 | switch (operator) { |
| 787 | |
| 788 | /* |
| 789 | * For the operators below, no strings are allowed and |
| 790 | * ints get converted to floats if necessary. |
| 791 | */ |
| 792 | |
| 793 | case MULT: case DIVIDE: case PLUS: case MINUS: |
| 794 | if ((valuePtr->type == TYPE_STRING) |
| 795 | || (value2.type == TYPE_STRING)) { |
| 796 | badType = TYPE_STRING; |
| 797 | goto illegalType; |
| 798 | } |
| 799 | if (valuePtr->type == TYPE_DOUBLE) { |
| 800 | if (value2.type == TYPE_INT) { |
| 801 | value2.doubleValue = value2.intValue; |
| 802 | value2.type = TYPE_DOUBLE; |
| 803 | } |
| 804 | } else if (value2.type == TYPE_DOUBLE) { |
| 805 | if (valuePtr->type == TYPE_INT) { |
| 806 | valuePtr->doubleValue = valuePtr->intValue; |
| 807 | valuePtr->type = TYPE_DOUBLE; |
| 808 | } |
| 809 | } |
| 810 | break; |
| 811 | |
| 812 | /* |
| 813 | * For the operators below, only integers are allowed. |
| 814 | */ |
| 815 | |
| 816 | case MOD: case LEFT_SHIFT: case RIGHT_SHIFT: |
| 817 | case BIT_AND: case BIT_XOR: case BIT_OR: |
| 818 | if (valuePtr->type != TYPE_INT) { |
| 819 | badType = valuePtr->type; |
| 820 | goto illegalType; |
| 821 | } else if (value2.type != TYPE_INT) { |
| 822 | badType = value2.type; |
| 823 | goto illegalType; |
| 824 | } |
| 825 | break; |
| 826 | |
| 827 | /* |
| 828 | * For the operators below, any type is allowed but the |
| 829 | * two operands must have the same type. Convert integers |
| 830 | * to floats and either to strings, if necessary. |
| 831 | */ |
| 832 | |
| 833 | case LESS: case GREATER: case LEQ: case GEQ: |
| 834 | case EQUAL: case NEQ: |
| 835 | if (valuePtr->type == TYPE_STRING) { |
| 836 | if (value2.type != TYPE_STRING) { |
| 837 | ExprMakeString(&value2); |
| 838 | } |
| 839 | } else if (value2.type == TYPE_STRING) { |
| 840 | if (valuePtr->type != TYPE_STRING) { |
| 841 | ExprMakeString(valuePtr); |
| 842 | } |
| 843 | } else if (valuePtr->type == TYPE_DOUBLE) { |
| 844 | if (value2.type == TYPE_INT) { |
| 845 | value2.doubleValue = value2.intValue; |
| 846 | value2.type = TYPE_DOUBLE; |
| 847 | } |
| 848 | } else if (value2.type == TYPE_DOUBLE) { |
| 849 | if (valuePtr->type == TYPE_INT) { |
| 850 | valuePtr->doubleValue = valuePtr->intValue; |
| 851 | valuePtr->type = TYPE_DOUBLE; |
| 852 | } |
| 853 | } |
| 854 | break; |
| 855 | |
| 856 | /* |
| 857 | * For the operators below, no strings are allowed, but |
| 858 | * no int->double conversions are performed. |
| 859 | */ |
| 860 | |
| 861 | case AND: case OR: |
| 862 | if (valuePtr->type == TYPE_STRING) { |
| 863 | badType = valuePtr->type; |
| 864 | goto illegalType; |
| 865 | } |
| 866 | if (value2.type == TYPE_STRING) { |
| 867 | badType = value2.type; |
| 868 | goto illegalType; |
| 869 | } |
| 870 | break; |
| 871 | |
| 872 | /* |
| 873 | * For the operators below, type and conversions are |
| 874 | * irrelevant: they're handled elsewhere. |
| 875 | */ |
| 876 | |
| 877 | case QUESTY: case COLON: |
| 878 | break; |
| 879 | |
| 880 | /* |
| 881 | * Any other operator is an error. |
| 882 | */ |
| 883 | |
| 884 | default: |
| 885 | interp->result = "unknown operator in expression"; |
| 886 | result = TCL_ERROR; |
| 887 | goto done; |
| 888 | } |
| 889 | |
| 890 | /* |
| 891 | * If necessary, convert one of the operands to the type |
| 892 | * of the other. If the operands are incompatible with |
| 893 | * the operator (e.g. "+" on strings) then return an |
| 894 | * error. |
| 895 | */ |
| 896 | |
| 897 | switch (operator) { |
| 898 | case MULT: |
| 899 | if (valuePtr->type == TYPE_INT) { |
| 900 | valuePtr->intValue *= value2.intValue; |
| 901 | } else { |
| 902 | valuePtr->doubleValue *= value2.doubleValue; |
| 903 | } |
| 904 | break; |
| 905 | case DIVIDE: |
| 906 | if (valuePtr->type == TYPE_INT) { |
| 907 | if (value2.intValue == 0) { |
| 908 | divideByZero: |
| 909 | interp->result = "divide by zero"; |
| 910 | result = TCL_ERROR; |
| 911 | goto done; |
| 912 | } |
| 913 | valuePtr->intValue /= value2.intValue; |
| 914 | } else { |
| 915 | if (value2.doubleValue == 0.0) { |
| 916 | goto divideByZero; |
| 917 | } |
| 918 | valuePtr->doubleValue /= value2.doubleValue; |
| 919 | } |
| 920 | break; |
| 921 | case MOD: |
| 922 | if (value2.intValue == 0) { |
| 923 | goto divideByZero; |
| 924 | } |
| 925 | valuePtr->intValue %= value2.intValue; |
| 926 | break; |
| 927 | case PLUS: |
| 928 | if (valuePtr->type == TYPE_INT) { |
| 929 | valuePtr->intValue += value2.intValue; |
| 930 | } else { |
| 931 | valuePtr->doubleValue += value2.doubleValue; |
| 932 | } |
| 933 | break; |
| 934 | case MINUS: |
| 935 | if (valuePtr->type == TYPE_INT) { |
| 936 | valuePtr->intValue -= value2.intValue; |
| 937 | } else { |
| 938 | valuePtr->doubleValue -= value2.doubleValue; |
| 939 | } |
| 940 | break; |
| 941 | case LEFT_SHIFT: |
| 942 | valuePtr->intValue <<= value2.intValue; |
| 943 | break; |
| 944 | case RIGHT_SHIFT: |
| 945 | /* |
| 946 | * The following code is a bit tricky: it ensures that |
| 947 | * right shifts propagate the sign bit even on machines |
| 948 | * where ">>" won't do it by default. |
| 949 | */ |
| 950 | |
| 951 | if (valuePtr->intValue < 0) { |
| 952 | valuePtr->intValue = |
| 953 | ~((~valuePtr->intValue) >> value2.intValue); |
| 954 | } else { |
| 955 | valuePtr->intValue >>= value2.intValue; |
| 956 | } |
| 957 | break; |
| 958 | case LESS: |
| 959 | if (valuePtr->type == TYPE_INT) { |
| 960 | valuePtr->intValue = |
| 961 | valuePtr->intValue < value2.intValue; |
| 962 | } else if (valuePtr->type == TYPE_DOUBLE) { |
| 963 | valuePtr->intValue = |
| 964 | valuePtr->doubleValue < value2.doubleValue; |
| 965 | } else { |
| 966 | valuePtr->intValue = |
| 967 | strcmp(valuePtr->pv.buffer, value2.pv.buffer) < 0; |
| 968 | } |
| 969 | valuePtr->type = TYPE_INT; |
| 970 | break; |
| 971 | case GREATER: |
| 972 | if (valuePtr->type == TYPE_INT) { |
| 973 | valuePtr->intValue = |
| 974 | valuePtr->intValue > value2.intValue; |
| 975 | } else if (valuePtr->type == TYPE_DOUBLE) { |
| 976 | valuePtr->intValue = |
| 977 | valuePtr->doubleValue > value2.doubleValue; |
| 978 | } else { |
| 979 | valuePtr->intValue = |
| 980 | strcmp(valuePtr->pv.buffer, value2.pv.buffer) > 0; |
| 981 | } |
| 982 | valuePtr->type = TYPE_INT; |
| 983 | break; |
| 984 | case LEQ: |
| 985 | if (valuePtr->type == TYPE_INT) { |
| 986 | valuePtr->intValue = |
| 987 | valuePtr->intValue <= value2.intValue; |
| 988 | } else if (valuePtr->type == TYPE_DOUBLE) { |
| 989 | valuePtr->intValue = |
| 990 | valuePtr->doubleValue <= value2.doubleValue; |
| 991 | } else { |
| 992 | valuePtr->intValue = |
| 993 | strcmp(valuePtr->pv.buffer, value2.pv.buffer) <= 0; |
| 994 | } |
| 995 | valuePtr->type = TYPE_INT; |
| 996 | break; |
| 997 | case GEQ: |
| 998 | if (valuePtr->type == TYPE_INT) { |
| 999 | valuePtr->intValue = |
| 1000 | valuePtr->intValue >= value2.intValue; |
| 1001 | } else if (valuePtr->type == TYPE_DOUBLE) { |
| 1002 | valuePtr->intValue = |
| 1003 | valuePtr->doubleValue >= value2.doubleValue; |
| 1004 | } else { |
| 1005 | valuePtr->intValue = |
| 1006 | strcmp(valuePtr->pv.buffer, value2.pv.buffer) >= 0; |
| 1007 | } |
| 1008 | valuePtr->type = TYPE_INT; |
| 1009 | break; |
| 1010 | case EQUAL: |
| 1011 | if (valuePtr->type == TYPE_INT) { |
| 1012 | valuePtr->intValue = |
| 1013 | valuePtr->intValue == value2.intValue; |
| 1014 | } else if (valuePtr->type == TYPE_DOUBLE) { |
| 1015 | valuePtr->intValue = |
| 1016 | valuePtr->doubleValue == value2.doubleValue; |
| 1017 | } else { |
| 1018 | valuePtr->intValue = |
| 1019 | strcmp(valuePtr->pv.buffer, value2.pv.buffer) == 0; |
| 1020 | } |
| 1021 | valuePtr->type = TYPE_INT; |
| 1022 | break; |
| 1023 | case NEQ: |
| 1024 | if (valuePtr->type == TYPE_INT) { |
| 1025 | valuePtr->intValue = |
| 1026 | valuePtr->intValue != value2.intValue; |
| 1027 | } else if (valuePtr->type == TYPE_DOUBLE) { |
| 1028 | valuePtr->intValue = |
| 1029 | valuePtr->doubleValue != value2.doubleValue; |
| 1030 | } else { |
| 1031 | valuePtr->intValue = |
| 1032 | strcmp(valuePtr->pv.buffer, value2.pv.buffer) != 0; |
| 1033 | } |
| 1034 | valuePtr->type = TYPE_INT; |
| 1035 | break; |
| 1036 | case BIT_AND: |
| 1037 | valuePtr->intValue &= value2.intValue; |
| 1038 | break; |
| 1039 | case BIT_XOR: |
| 1040 | valuePtr->intValue ^= value2.intValue; |
| 1041 | break; |
| 1042 | case BIT_OR: |
| 1043 | valuePtr->intValue |= value2.intValue; |
| 1044 | break; |
| 1045 | |
| 1046 | /* |
| 1047 | * For AND and OR, we know that the first value has already |
| 1048 | * been converted to an integer. Thus we need only consider |
| 1049 | * the possibility of int vs. double for the second value. |
| 1050 | */ |
| 1051 | |
| 1052 | case AND: |
| 1053 | if (value2.type == TYPE_DOUBLE) { |
| 1054 | value2.intValue = value2.doubleValue != 0; |
| 1055 | value2.type = TYPE_INT; |
| 1056 | } |
| 1057 | valuePtr->intValue = valuePtr->intValue && value2.intValue; |
| 1058 | break; |
| 1059 | case OR: |
| 1060 | if (value2.type == TYPE_DOUBLE) { |
| 1061 | value2.intValue = value2.doubleValue != 0; |
| 1062 | value2.type = TYPE_INT; |
| 1063 | } |
| 1064 | valuePtr->intValue = valuePtr->intValue || value2.intValue; |
| 1065 | break; |
| 1066 | |
| 1067 | case COLON: |
| 1068 | interp->result = "can't have : operator without ? first"; |
| 1069 | result = TCL_ERROR; |
| 1070 | goto done; |
| 1071 | } |
| 1072 | } |
| 1073 | |
| 1074 | done: |
| 1075 | if (value2.pv.buffer != value2.staticSpace) { |
| 1076 | ckfree(value2.pv.buffer); |
| 1077 | } |
| 1078 | return result; |
| 1079 | |
| 1080 | syntaxError: |
| 1081 | Tcl_ResetResult(interp); |
| 1082 | Tcl_AppendResult(interp, "syntax error in expression \"", |
| 1083 | infoPtr->originalExpr, "\"", (char *) NULL); |
| 1084 | result = TCL_ERROR; |
| 1085 | goto done; |
| 1086 | |
| 1087 | illegalType: |
| 1088 | Tcl_AppendResult(interp, "can't use ", (badType == TYPE_DOUBLE) ? |
| 1089 | "floating-point value" : "non-numeric string", |
| 1090 | " as operand of \"", operatorStrings[operator], "\"", |
| 1091 | (char *) NULL); |
| 1092 | result = TCL_ERROR; |
| 1093 | goto done; |
| 1094 | } |
| 1095 | \f |
| 1096 | /* |
| 1097 | *-------------------------------------------------------------- |
| 1098 | * |
| 1099 | * ExprMakeString -- |
| 1100 | * |
| 1101 | * Convert a value from int or double representation to |
| 1102 | * a string. |
| 1103 | * |
| 1104 | * Results: |
| 1105 | * The information at *valuePtr gets converted to string |
| 1106 | * format, if it wasn't that way already. |
| 1107 | * |
| 1108 | * Side effects: |
| 1109 | * None. |
| 1110 | * |
| 1111 | *-------------------------------------------------------------- |
| 1112 | */ |
| 1113 | |
| 1114 | static void |
| 1115 | ExprMakeString(valuePtr) |
| 1116 | register Value *valuePtr; /* Value to be converted. */ |
| 1117 | { |
| 1118 | int shortfall; |
| 1119 | |
| 1120 | shortfall = 150 - (valuePtr->pv.end - valuePtr->pv.buffer); |
| 1121 | if (shortfall > 0) { |
| 1122 | (*valuePtr->pv.expandProc)(&valuePtr->pv, shortfall); |
| 1123 | } |
| 1124 | if (valuePtr->type == TYPE_INT) { |
| 1125 | sprintf(valuePtr->pv.buffer, "%ld", valuePtr->intValue); |
| 1126 | } else if (valuePtr->type == TYPE_DOUBLE) { |
| 1127 | sprintf(valuePtr->pv.buffer, "%g", valuePtr->doubleValue); |
| 1128 | } |
| 1129 | valuePtr->type = TYPE_STRING; |
| 1130 | } |
| 1131 | \f |
| 1132 | /* |
| 1133 | *-------------------------------------------------------------- |
| 1134 | * |
| 1135 | * ExprTopLevel -- |
| 1136 | * |
| 1137 | * This procedure provides top-level functionality shared by |
| 1138 | * procedures like Tcl_ExprInt, Tcl_ExprDouble, etc. |
| 1139 | * |
| 1140 | * Results: |
| 1141 | * The result is a standard Tcl return value. If an error |
| 1142 | * occurs then an error message is left in interp->result. |
| 1143 | * The value of the expression is returned in *valuePtr, in |
| 1144 | * whatever form it ends up in (could be string or integer |
| 1145 | * or double). Caller may need to convert result. Caller |
| 1146 | * is also responsible for freeing string memory in *valuePtr, |
| 1147 | * if any was allocated. |
| 1148 | * |
| 1149 | * Side effects: |
| 1150 | * None. |
| 1151 | * |
| 1152 | *-------------------------------------------------------------- |
| 1153 | */ |
| 1154 | |
| 1155 | static int |
| 1156 | ExprTopLevel(interp, string, valuePtr) |
| 1157 | Tcl_Interp *interp; /* Context in which to evaluate the |
| 1158 | * expression. */ |
| 1159 | char *string; /* Expression to evaluate. */ |
| 1160 | Value *valuePtr; /* Where to store result. Should |
| 1161 | * not be initialized by caller. */ |
| 1162 | { |
| 1163 | ExprInfo info; |
| 1164 | int result; |
| 1165 | |
| 1166 | info.originalExpr = string; |
| 1167 | info.expr = string; |
| 1168 | valuePtr->pv.buffer = valuePtr->pv.next = valuePtr->staticSpace; |
| 1169 | valuePtr->pv.end = valuePtr->pv.buffer + STATIC_STRING_SPACE - 1; |
| 1170 | valuePtr->pv.expandProc = TclExpandParseValue; |
| 1171 | valuePtr->pv.clientData = (ClientData) NULL; |
| 1172 | |
| 1173 | result = ExprGetValue(interp, &info, -1, valuePtr); |
| 1174 | if (result != TCL_OK) { |
| 1175 | return result; |
| 1176 | } |
| 1177 | if (info.token != END) { |
| 1178 | Tcl_AppendResult(interp, "syntax error in expression \"", |
| 1179 | string, "\"", (char *) NULL); |
| 1180 | return TCL_ERROR; |
| 1181 | } |
| 1182 | return TCL_OK; |
| 1183 | } |
| 1184 | \f |
| 1185 | /* |
| 1186 | *-------------------------------------------------------------- |
| 1187 | * |
| 1188 | * Tcl_ExprLong, Tcl_ExprDouble, Tcl_ExprBoolean -- |
| 1189 | * |
| 1190 | * Procedures to evaluate an expression and return its value |
| 1191 | * in a particular form. |
| 1192 | * |
| 1193 | * Results: |
| 1194 | * Each of the procedures below returns a standard Tcl result. |
| 1195 | * If an error occurs then an error message is left in |
| 1196 | * interp->result. Otherwise the value of the expression, |
| 1197 | * in the appropriate form, is stored at *resultPtr. If |
| 1198 | * the expression had a result that was incompatible with the |
| 1199 | * desired form then an error is returned. |
| 1200 | * |
| 1201 | * Side effects: |
| 1202 | * None. |
| 1203 | * |
| 1204 | *-------------------------------------------------------------- |
| 1205 | */ |
| 1206 | |
| 1207 | int |
| 1208 | Tcl_ExprLong(interp, string, ptr) |
| 1209 | Tcl_Interp *interp; /* Context in which to evaluate the |
| 1210 | * expression. */ |
| 1211 | char *string; /* Expression to evaluate. */ |
| 1212 | long *ptr; /* Where to store result. */ |
| 1213 | { |
| 1214 | Value value; |
| 1215 | int result; |
| 1216 | |
| 1217 | result = ExprTopLevel(interp, string, &value); |
| 1218 | if (result == TCL_OK) { |
| 1219 | if (value.type == TYPE_INT) { |
| 1220 | *ptr = value.intValue; |
| 1221 | } else if (value.type == TYPE_DOUBLE) { |
| 1222 | *ptr = value.doubleValue; |
| 1223 | } else { |
| 1224 | interp->result = "expression didn't have numeric value"; |
| 1225 | result = TCL_ERROR; |
| 1226 | } |
| 1227 | } |
| 1228 | if (value.pv.buffer != value.staticSpace) { |
| 1229 | ckfree(value.pv.buffer); |
| 1230 | } |
| 1231 | return result; |
| 1232 | } |
| 1233 | |
| 1234 | int |
| 1235 | Tcl_ExprDouble(interp, string, ptr) |
| 1236 | Tcl_Interp *interp; /* Context in which to evaluate the |
| 1237 | * expression. */ |
| 1238 | char *string; /* Expression to evaluate. */ |
| 1239 | double *ptr; /* Where to store result. */ |
| 1240 | { |
| 1241 | Value value; |
| 1242 | int result; |
| 1243 | |
| 1244 | result = ExprTopLevel(interp, string, &value); |
| 1245 | if (result == TCL_OK) { |
| 1246 | if (value.type == TYPE_INT) { |
| 1247 | *ptr = value.intValue; |
| 1248 | } else if (value.type == TYPE_DOUBLE) { |
| 1249 | *ptr = value.doubleValue; |
| 1250 | } else { |
| 1251 | interp->result = "expression didn't have numeric value"; |
| 1252 | result = TCL_ERROR; |
| 1253 | } |
| 1254 | } |
| 1255 | if (value.pv.buffer != value.staticSpace) { |
| 1256 | ckfree(value.pv.buffer); |
| 1257 | } |
| 1258 | return result; |
| 1259 | } |
| 1260 | |
| 1261 | int |
| 1262 | Tcl_ExprBoolean(interp, string, ptr) |
| 1263 | Tcl_Interp *interp; /* Context in which to evaluate the |
| 1264 | * expression. */ |
| 1265 | char *string; /* Expression to evaluate. */ |
| 1266 | int *ptr; /* Where to store 0/1 result. */ |
| 1267 | { |
| 1268 | Value value; |
| 1269 | int result; |
| 1270 | |
| 1271 | result = ExprTopLevel(interp, string, &value); |
| 1272 | if (result == TCL_OK) { |
| 1273 | if (value.type == TYPE_INT) { |
| 1274 | *ptr = value.intValue != 0; |
| 1275 | } else if (value.type == TYPE_DOUBLE) { |
| 1276 | *ptr = value.doubleValue != 0.0; |
| 1277 | } else { |
| 1278 | interp->result = "expression didn't have numeric value"; |
| 1279 | result = TCL_ERROR; |
| 1280 | } |
| 1281 | } |
| 1282 | if (value.pv.buffer != value.staticSpace) { |
| 1283 | ckfree(value.pv.buffer); |
| 1284 | } |
| 1285 | return result; |
| 1286 | } |
| 1287 | \f |
| 1288 | /* |
| 1289 | *-------------------------------------------------------------- |
| 1290 | * |
| 1291 | * Tcl_ExprString -- |
| 1292 | * |
| 1293 | * Evaluate an expression and return its value in string form. |
| 1294 | * |
| 1295 | * Results: |
| 1296 | * A standard Tcl result. If the result is TCL_OK, then the |
| 1297 | * interpreter's result is set to the string value of the |
| 1298 | * expression. If the result is TCL_OK, then interp->result |
| 1299 | * contains an error message. |
| 1300 | * |
| 1301 | * Side effects: |
| 1302 | * None. |
| 1303 | * |
| 1304 | *-------------------------------------------------------------- |
| 1305 | */ |
| 1306 | |
| 1307 | int |
| 1308 | Tcl_ExprString(interp, string) |
| 1309 | Tcl_Interp *interp; /* Context in which to evaluate the |
| 1310 | * expression. */ |
| 1311 | char *string; /* Expression to evaluate. */ |
| 1312 | { |
| 1313 | Value value; |
| 1314 | int result; |
| 1315 | |
| 1316 | result = ExprTopLevel(interp, string, &value); |
| 1317 | if (result == TCL_OK) { |
| 1318 | if (value.type == TYPE_INT) { |
| 1319 | sprintf(interp->result, "%ld", value.intValue); |
| 1320 | } else if (value.type == TYPE_DOUBLE) { |
| 1321 | sprintf(interp->result, "%g", value.doubleValue); |
| 1322 | } else { |
| 1323 | if (value.pv.buffer != value.staticSpace) { |
| 1324 | interp->result = value.pv.buffer; |
| 1325 | interp->freeProc = (Tcl_FreeProc *) free; |
| 1326 | value.pv.buffer = value.staticSpace; |
| 1327 | } else { |
| 1328 | Tcl_SetResult(interp, value.pv.buffer, TCL_VOLATILE); |
| 1329 | } |
| 1330 | } |
| 1331 | } |
| 1332 | if (value.pv.buffer != value.staticSpace) { |
| 1333 | ckfree(value.pv.buffer); |
| 1334 | } |
| 1335 | return result; |
| 1336 | } |