Mercurial > hg > octave-lyh
annotate src/pt-assign.cc @ 7767:71f068b22fcc
scope and context fixes for function handles
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Wed, 07 May 2008 13:45:30 -0400 |
| parents | 4d0d6c357bc6 |
| children | 3100283874d7 |
| rev | line source |
|---|---|
| 2980 | 1 /* |
| 2 | |
| 7017 | 3 Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2004, 2005, |
| 4 2006, 2007 John W. Eaton | |
| 2980 | 5 |
| 6 This file is part of Octave. | |
| 7 | |
| 8 Octave is free software; you can redistribute it and/or modify it | |
| 9 under the terms of the GNU General Public License as published by the | |
| 7016 | 10 Free Software Foundation; either version 3 of the License, or (at your |
| 11 option) any later version. | |
| 2980 | 12 |
| 13 Octave 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 | |
| 16 for more details. | |
| 17 | |
| 18 You should have received a copy of the GNU General Public License | |
| 7016 | 19 along with Octave; see the file COPYING. If not, see |
| 20 <http://www.gnu.org/licenses/>. | |
| 2980 | 21 |
| 22 */ | |
| 23 | |
| 24 #ifdef HAVE_CONFIG_H | |
| 25 #include <config.h> | |
| 26 #endif | |
| 27 | |
| 3503 | 28 #include <iostream> |
| 6253 | 29 #include <set> |
| 2980 | 30 |
| 31 #include "defun.h" | |
| 32 #include "error.h" | |
| 33 #include "input.h" | |
| 34 #include "oct-obj.h" | |
| 35 #include "oct-lvalue.h" | |
| 36 #include "pager.h" | |
| 37 #include "ov.h" | |
| 2982 | 38 #include "pt-arg-list.h" |
| 3770 | 39 #include "pt-bp.h" |
| 2980 | 40 #include "pt-assign.h" |
| 41 #include "pt-walk.h" | |
| 42 #include "utils.h" | |
| 5794 | 43 #include "variables.h" |
| 2980 | 44 |
| 45 // Simple assignment expressions. | |
| 46 | |
| 6253 | 47 static const char *former_built_in_variables[] = |
| 48 { | |
| 49 "DEFAULT_EXEC_PATH", | |
| 50 "DEFAULT_LOADPATH", | |
| 51 "EDITOR", | |
| 52 "EXEC_PATH", | |
| 53 "FFTW_WISDOM_PROGRAM", | |
| 54 "IMAGEPATH", | |
| 55 "INFO_FILE", | |
| 56 "INFO_PROGRAM", | |
| 57 "LOADPATH", | |
| 58 "MAKEINFO_PROGRAM", | |
| 59 "PAGER", | |
| 60 "PS1", | |
| 61 "PS2", | |
| 62 "PS4", | |
| 63 "__kluge_procbuf_delay__", | |
| 64 "ans", | |
| 65 "automatic_replot", | |
| 66 "beep_on_error", | |
| 67 "completion_append_char", | |
| 68 "crash_dumps_octave_core", | |
| 69 "current_script_file_name", | |
| 70 "debug_on_error", | |
| 71 "debug_on_interrupt", | |
| 72 "debug_on_warning", | |
| 73 "debug_symtab_lookups", | |
| 74 "default_save_format", | |
| 75 "echo_executing_commands", | |
| 76 "fixed_point_format", | |
| 77 "gnuplot_binary", | |
| 78 "gnuplot_command_axes", | |
| 79 "gnuplot_command_end", | |
| 80 "gnuplot_command_plot", | |
| 81 "gnuplot_command_replot", | |
| 82 "gnuplot_command_splot", | |
| 83 "gnuplot_command_title", | |
| 84 "gnuplot_command_using", | |
| 85 "gnuplot_command_with", | |
| 86 "gnuplot_has_frames", | |
| 87 "history_file", | |
| 88 "history_size", | |
| 89 "ignore_function_time_stamp", | |
| 90 "max_recursion_depth", | |
| 91 "octave_core_file_format", | |
| 92 "octave_core_file_limit", | |
| 93 "octave_core_file_name", | |
| 94 "output_max_field_width", | |
| 95 "output_precision", | |
| 96 "page_output_immediately", | |
| 97 "page_screen_output", | |
| 98 "print_answer_id_name", | |
| 99 "print_empty_dimensions", | |
| 100 "print_rhs_assign_val", | |
| 101 "save_header_format_string", | |
| 102 "save_precision", | |
| 103 "saving_history", | |
| 104 "sighup_dumps_octave_core", | |
| 105 "sigterm_dumps_octave_core", | |
| 106 "silent_functions", | |
| 107 "split_long_rows", | |
| 108 "string_fill_char", | |
| 109 "struct_levels_to_print", | |
| 110 "suppress_verbose_help_message", | |
| 111 "variables_can_hide_functions", | |
| 112 "warn_assign_as_truth_value", | |
| 113 "warn_associativity_change", | |
| 114 "warn_divide_by_zero", | |
| 115 "warn_empty_list_elements", | |
| 116 "warn_fortran_indexing", | |
| 117 "warn_function_name_clash", | |
| 118 "warn_future_time_stamp", | |
| 119 "warn_imag_to_real", | |
| 120 "warn_matlab_incompatible", | |
| 121 "warn_missing_semicolon", | |
| 122 "warn_neg_dim_as_zero", | |
| 123 "warn_num_to_str", | |
| 124 "warn_precedence_change", | |
| 125 "warn_reload_forces_clear", | |
| 126 "warn_resize_on_range_error", | |
| 127 "warn_separator_insert", | |
| 128 "warn_single_quote_string", | |
| 129 "warn_str_to_num", | |
| 130 "warn_undefined_return_values", | |
| 131 "warn_variable_switch_label", | |
| 132 "whos_line_format", | |
| 133 0, | |
| 134 }; | |
| 135 | |
| 136 static void | |
| 137 maybe_warn_former_built_in_variable (const std::string& nm) | |
| 138 { | |
| 139 static bool initialized = false; | |
| 140 | |
| 141 static std::set<std::string> vars; | |
| 142 | |
| 143 if (! initialized) | |
| 144 { | |
| 145 const char **p = former_built_in_variables; | |
| 146 | |
| 147 while (*p) | |
| 148 vars.insert (*p++); | |
| 149 } | |
| 150 | |
| 151 if (vars.find (nm) != vars.end ()) | |
| 152 warning_with_id ("Octave:built-in-variable-assignment", | |
| 153 "%s is no longer a built-in variable; please read the NEWS file or type `news' for details", | |
| 154 nm.c_str ()); | |
| 155 } | |
| 156 | |
| 157 tree_simple_assignment::tree_simple_assignment | |
| 158 (tree_expression *le, tree_expression *re, | |
| 159 bool plhs, int l, int c, octave_value::assign_op t) | |
| 160 : tree_expression (l, c), lhs (le), rhs (re), preserve (plhs), etype (t) | |
| 161 { | |
| 162 if (lhs) | |
| 163 maybe_warn_former_built_in_variable (lhs->name ()); | |
| 164 } | |
| 165 | |
| 2980 | 166 tree_simple_assignment::~tree_simple_assignment (void) |
| 167 { | |
| 168 if (! preserve) | |
| 169 delete lhs; | |
| 170 | |
| 171 delete rhs; | |
| 172 } | |
| 173 | |
| 174 octave_value_list | |
| 175 tree_simple_assignment::rvalue (int nargout) | |
| 176 { | |
| 177 octave_value_list retval; | |
| 178 | |
| 3770 | 179 MAYBE_DO_BREAKPOINT; |
| 180 | |
| 2980 | 181 if (nargout > 1) |
| 182 error ("invalid number of output arguments for expression X = RHS"); | |
| 183 else | |
| 184 retval = rvalue (); | |
| 185 | |
| 186 return retval; | |
| 187 } | |
| 188 | |
| 5775 | 189 // FIXME -- this works, but it would look a little better if |
| 2984 | 190 // it were broken up into a couple of separate functions. |
| 191 | |
| 2980 | 192 octave_value |
| 193 tree_simple_assignment::rvalue (void) | |
| 194 { | |
| 3208 | 195 octave_value retval; |
| 2980 | 196 |
| 197 if (error_state) | |
| 3208 | 198 return retval; |
| 2980 | 199 |
| 200 if (rhs) | |
| 201 { | |
| 202 octave_value_list tmp = rhs->rvalue (); | |
| 203 | |
| 204 if (! (error_state || tmp.empty ())) | |
| 205 { | |
| 3208 | 206 octave_value rhs_val = tmp(0); |
| 2980 | 207 |
| 208 if (rhs_val.is_undefined ()) | |
| 209 { | |
| 210 error ("value on right hand side of assignment is undefined"); | |
| 211 eval_error (); | |
| 7389 | 212 return retval; |
| 5750 | 213 } |
| 2980 | 214 else |
| 215 { | |
| 7389 | 216 if (rhs_val.is_cs_list ()) |
| 217 { | |
| 218 octave_value_list lst = rhs_val.list_value (); | |
| 219 | |
| 220 if (! lst.empty ()) | |
| 221 rhs_val = lst(0); | |
| 222 else | |
| 223 { | |
| 224 error ("invalid number of elements on RHS of assignment"); | |
| 225 eval_error (); | |
| 226 return retval; | |
| 227 } | |
| 228 } | |
| 229 | |
| 2980 | 230 octave_lvalue ult = lhs->lvalue (); |
| 231 | |
| 232 if (error_state) | |
| 233 eval_error (); | |
| 234 else | |
| 235 { | |
| 236 ult.assign (etype, rhs_val); | |
| 237 | |
| 3215 | 238 if (! error_state) |
| 239 { | |
| 3527 | 240 if (etype == octave_value::op_asn_eq) |
| 3215 | 241 retval = rhs_val; |
| 242 else | |
| 243 retval = ult.value (); | |
| 2984 | 244 |
| 3215 | 245 if (print_result ()) |
| 3208 | 246 { |
| 5841 | 247 // We clear any index here so that we can |
| 248 // get the new value of the referenced | |
| 249 // object below, instead of the indexed | |
| 250 // value (which should be the same as the | |
| 251 // right hand side value). | |
| 2980 | 252 |
| 5841 | 253 ult.clear_index (); |
| 3208 | 254 |
| 5841 | 255 octave_value lhs_val = ult.value (); |
| 3208 | 256 |
| 5841 | 257 if (! error_state) |
| 258 lhs_val.print_with_name (octave_stdout, | |
| 259 lhs->name ()); | |
| 2980 | 260 } |
| 261 } | |
| 3215 | 262 else |
| 263 eval_error (); | |
| 2980 | 264 } |
| 265 } | |
| 266 } | |
| 267 else | |
| 268 eval_error (); | |
| 269 } | |
| 270 | |
| 3208 | 271 return retval; |
| 2980 | 272 } |
| 273 | |
| 274 void | |
| 275 tree_simple_assignment::eval_error (void) | |
| 276 { | |
| 3965 | 277 int l = line (); |
| 278 int c = column (); | |
| 2980 | 279 |
| 3965 | 280 if (l != -1 && c != -1) |
| 281 ::error ("evaluating assignment expression near line %d, column %d", | |
| 282 l, c); | |
| 2980 | 283 } |
| 284 | |
| 3536 | 285 std::string |
| 2980 | 286 tree_simple_assignment::oper (void) const |
| 287 { | |
| 288 return octave_value::assign_op_as_string (etype); | |
| 289 } | |
| 290 | |
| 5861 | 291 tree_expression * |
|
7767
71f068b22fcc
scope and context fixes for function handles
John W. Eaton <jwe@octave.org>
parents:
7389
diff
changeset
|
292 tree_simple_assignment::dup (symbol_table::scope_id scope, |
|
71f068b22fcc
scope and context fixes for function handles
John W. Eaton <jwe@octave.org>
parents:
7389
diff
changeset
|
293 symbol_table::context_id context) |
| 5861 | 294 { |
| 295 tree_simple_assignment *new_sa | |
|
7767
71f068b22fcc
scope and context fixes for function handles
John W. Eaton <jwe@octave.org>
parents:
7389
diff
changeset
|
296 = new tree_simple_assignment (lhs ? lhs->dup (scope, context) : 0, |
|
71f068b22fcc
scope and context fixes for function handles
John W. Eaton <jwe@octave.org>
parents:
7389
diff
changeset
|
297 rhs ? rhs->dup (scope, context) : 0, |
| 5861 | 298 preserve, etype); |
| 299 | |
| 300 new_sa->copy_base (*this); | |
| 301 | |
| 302 return new_sa; | |
| 303 } | |
| 304 | |
| 2980 | 305 void |
| 306 tree_simple_assignment::accept (tree_walker& tw) | |
| 307 { | |
| 308 tw.visit_simple_assignment (*this); | |
| 309 } | |
| 310 | |
| 311 // Multi-valued assignment expressions. | |
| 312 | |
| 6253 | 313 tree_multi_assignment::tree_multi_assignment |
| 314 (tree_argument_list *lst, tree_expression *r, | |
| 315 bool plhs, int l, int c, octave_value::assign_op t) | |
| 316 : tree_expression (l, c), lhs (lst), rhs (r), preserve (plhs), etype (t) | |
| 317 { | |
| 318 for (tree_argument_list::iterator p = lhs->begin (); p != lhs->end (); p++) | |
| 319 { | |
| 6483 | 320 tree_expression *lhs_expr = *p; |
| 6253 | 321 |
| 6483 | 322 if (lhs_expr) |
| 323 maybe_warn_former_built_in_variable (lhs_expr->name ()); | |
| 6253 | 324 } |
| 325 } | |
| 326 | |
| 2980 | 327 tree_multi_assignment::~tree_multi_assignment (void) |
| 328 { | |
| 329 if (! preserve) | |
| 330 delete lhs; | |
| 331 | |
| 332 delete rhs; | |
| 333 } | |
| 334 | |
| 335 octave_value | |
| 336 tree_multi_assignment::rvalue (void) | |
| 337 { | |
| 338 octave_value retval; | |
| 339 | |
| 340 octave_value_list tmp = rvalue (1); | |
| 341 | |
| 342 if (! tmp.empty ()) | |
| 343 retval = tmp(0); | |
| 344 | |
| 345 return retval; | |
| 346 } | |
| 347 | |
| 5775 | 348 // FIXME -- this works, but it would look a little better if |
| 2984 | 349 // it were broken up into a couple of separate functions. |
| 350 | |
| 2980 | 351 octave_value_list |
| 352 tree_multi_assignment::rvalue (int) | |
| 353 { | |
| 3208 | 354 octave_value_list retval; |
| 2980 | 355 |
| 356 if (error_state) | |
| 3208 | 357 return retval; |
| 2980 | 358 |
| 359 if (rhs) | |
| 360 { | |
| 5846 | 361 std::list<octave_lvalue> lvalue_list = lhs->lvalue_list (); |
| 3977 | 362 |
| 363 if (error_state) | |
| 364 return retval; | |
| 2980 | 365 |
| 5846 | 366 int n_out = 0; |
| 367 | |
| 368 for (std::list<octave_lvalue>::const_iterator p = lvalue_list.begin (); | |
| 369 p != lvalue_list.end (); | |
| 370 p++) | |
| 371 n_out += p->numel (); | |
| 372 | |
| 3208 | 373 octave_value_list rhs_val = rhs->rvalue (n_out); |
| 2980 | 374 |
| 3977 | 375 if (error_state) |
| 376 return retval; | |
| 2980 | 377 |
| 3977 | 378 if (rhs_val.empty ()) |
| 379 { | |
| 5846 | 380 if (n_out > 0) |
| 381 { | |
| 382 error ("value on right hand side of assignment is undefined"); | |
| 383 eval_error (); | |
| 384 return retval; | |
| 385 } | |
| 3977 | 386 } |
| 387 else | |
| 388 { | |
| 5846 | 389 octave_idx_type k = 0; |
| 2980 | 390 |
| 5846 | 391 octave_idx_type n = rhs_val.length (); |
| 2980 | 392 |
| 5265 | 393 if (n == 1) |
| 394 { | |
| 395 octave_value tmp = rhs_val(0); | |
| 396 | |
| 397 if (tmp.is_cs_list ()) | |
| 398 { | |
| 7389 | 399 rhs_val = tmp.list_value (); |
| 400 n = rhs_val.length (); | |
| 5265 | 401 } |
| 402 } | |
| 403 | |
| 3977 | 404 retval.resize (n, octave_value ()); |
| 3208 | 405 |
| 5846 | 406 tree_argument_list::iterator q = lhs->begin (); |
| 407 | |
| 408 for (std::list<octave_lvalue>::iterator p = lvalue_list.begin (); | |
| 409 p != lvalue_list.end (); | |
| 4219 | 410 p++) |
| 3977 | 411 { |
| 5846 | 412 tree_expression *lhs_elt = *q++; |
| 413 | |
| 414 octave_lvalue ult = *p; | |
| 415 | |
| 416 octave_idx_type nel = ult.numel (); | |
| 3977 | 417 |
| 5846 | 418 if (nel > 1) |
| 3977 | 419 { |
| 5846 | 420 if (k + nel <= n) |
| 421 { | |
| 422 if (etype == octave_value::op_asn_eq) | |
| 423 { | |
| 424 octave_value_list ovl (nel, octave_value ()); | |
| 425 | |
| 426 for (octave_idx_type j = 0; j < nel; j++) | |
| 427 ovl(j) = rhs_val(k+j); | |
| 428 | |
| 429 ult.assign (etype, octave_value (ovl, true)); | |
| 2980 | 430 |
| 5846 | 431 if (! error_state) |
| 432 { | |
| 433 for (octave_idx_type j = 0; j < nel; j++) | |
| 434 retval(k+j) = rhs_val(k+j); | |
| 435 | |
| 436 k += nel; | |
| 437 } | |
| 438 } | |
| 439 else | |
| 440 { | |
| 441 std::string op = octave_value::assign_op_as_string (etype); | |
| 442 error ("operator %s unsupported for comma-separated list assignment", | |
| 443 op.c_str ()); | |
| 444 } | |
| 5750 | 445 } |
| 5846 | 446 else |
| 447 error ("some elements undefined in return list"); | |
| 448 } | |
| 449 else | |
| 450 { | |
| 451 if (k < n) | |
| 3977 | 452 { |
| 453 ult.assign (etype, rhs_val(k)); | |
| 454 | |
| 455 if (! error_state) | |
| 3208 | 456 { |
| 3977 | 457 if (etype == octave_value::op_asn_eq) |
| 458 retval(k) = rhs_val(k); | |
| 3208 | 459 else |
| 3977 | 460 retval(k) = ult.value (); |
| 5846 | 461 |
| 462 k++; | |
| 2980 | 463 } |
| 464 } | |
| 3208 | 465 else |
| 3977 | 466 error ("element number %d undefined in return list", k+1); |
| 5846 | 467 } |
| 2980 | 468 |
| 5846 | 469 if (error_state) |
| 470 { | |
| 471 eval_error (); | |
| 472 break; | |
| 473 } | |
| 474 else if (print_result ()) | |
| 475 { | |
| 476 // We clear any index here so that we can get | |
| 477 // the new value of the referenced object below, | |
| 478 // instead of the indexed value (which should be | |
| 479 // the same as the right hand side value). | |
| 3977 | 480 |
| 5846 | 481 ult.clear_index (); |
| 3208 | 482 |
| 5846 | 483 octave_value lhs_val = ult.value (); |
| 3977 | 484 |
| 5846 | 485 if (! error_state) |
| 486 lhs_val.print_with_name (octave_stdout, | |
| 487 lhs_elt->name ()); | |
| 2980 | 488 } |
| 3977 | 489 |
| 490 if (error_state) | |
| 491 break; | |
| 492 | |
| 2980 | 493 } |
| 494 } | |
| 495 } | |
| 3208 | 496 else |
| 497 eval_error (); | |
| 2980 | 498 |
| 3208 | 499 return retval; |
| 2980 | 500 } |
| 501 | |
| 502 void | |
| 503 tree_multi_assignment::eval_error (void) | |
| 504 { | |
| 3965 | 505 int l = line (); |
| 506 int c = column (); | |
| 2980 | 507 |
| 3965 | 508 if (l != -1 && c != -1) |
| 509 ::error ("evaluating assignment expression near line %d, column %d", | |
| 510 l, c); | |
| 2980 | 511 } |
| 512 | |
| 3536 | 513 std::string |
| 3208 | 514 tree_multi_assignment::oper (void) const |
| 515 { | |
| 516 return octave_value::assign_op_as_string (etype); | |
| 517 } | |
| 518 | |
| 5861 | 519 tree_expression * |
|
7767
71f068b22fcc
scope and context fixes for function handles
John W. Eaton <jwe@octave.org>
parents:
7389
diff
changeset
|
520 tree_multi_assignment::dup (symbol_table::scope_id scope, |
|
71f068b22fcc
scope and context fixes for function handles
John W. Eaton <jwe@octave.org>
parents:
7389
diff
changeset
|
521 symbol_table::context_id context) |
| 5861 | 522 { |
| 523 tree_multi_assignment *new_ma | |
|
7767
71f068b22fcc
scope and context fixes for function handles
John W. Eaton <jwe@octave.org>
parents:
7389
diff
changeset
|
524 = new tree_multi_assignment (lhs ? lhs->dup (scope, context) : 0, |
|
71f068b22fcc
scope and context fixes for function handles
John W. Eaton <jwe@octave.org>
parents:
7389
diff
changeset
|
525 rhs ? rhs->dup (scope, context) : 0, |
| 5861 | 526 preserve, etype); |
| 527 | |
| 528 new_ma->copy_base (*this); | |
| 529 | |
| 530 return new_ma; | |
| 531 } | |
| 532 | |
| 2980 | 533 void |
| 534 tree_multi_assignment::accept (tree_walker& tw) | |
| 535 { | |
| 536 tw.visit_multi_assignment (*this); | |
| 537 } | |
| 538 | |
| 539 /* | |
| 540 ;;; Local Variables: *** | |
| 541 ;;; mode: C++ *** | |
| 542 ;;; End: *** | |
| 543 */ |