Mercurial > hg > octave-nkf
annotate src/pt-assign.cc @ 9224:a6422d81bee7
pt-assign.cc (maybe_warn_former_built_in_variable): set initialized to true on first call
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Wed, 20 May 2009 14:27:10 -0400 |
| parents | eb63fbe60fab |
| children | 68f4034d4e7e |
| rev | line source |
|---|---|
| 2980 | 1 /* |
| 2 | |
| 7017 | 3 Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2004, 2005, |
| 8920 | 4 2006, 2007, 2008, 2009 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 | |
|
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47 // FIXME -- the following variable and the function that uses it |
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48 // should be removed from some future version of Octave. |
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49 |
| 6253 | 50 static const char *former_built_in_variables[] = |
| 51 { | |
| 52 "DEFAULT_EXEC_PATH", | |
| 53 "DEFAULT_LOADPATH", | |
| 54 "EDITOR", | |
| 55 "EXEC_PATH", | |
| 56 "FFTW_WISDOM_PROGRAM", | |
| 57 "IMAGEPATH", | |
| 58 "INFO_FILE", | |
| 59 "INFO_PROGRAM", | |
| 60 "LOADPATH", | |
| 61 "MAKEINFO_PROGRAM", | |
| 62 "PAGER", | |
| 63 "PS1", | |
| 64 "PS2", | |
| 65 "PS4", | |
| 66 "__kluge_procbuf_delay__", | |
| 67 "ans", | |
| 68 "automatic_replot", | |
| 69 "beep_on_error", | |
| 70 "completion_append_char", | |
| 71 "crash_dumps_octave_core", | |
| 72 "current_script_file_name", | |
| 73 "debug_on_error", | |
| 74 "debug_on_interrupt", | |
| 75 "debug_on_warning", | |
| 76 "debug_symtab_lookups", | |
| 77 "default_save_format", | |
| 78 "echo_executing_commands", | |
| 79 "fixed_point_format", | |
| 80 "gnuplot_binary", | |
| 81 "gnuplot_command_axes", | |
| 82 "gnuplot_command_end", | |
| 83 "gnuplot_command_plot", | |
| 84 "gnuplot_command_replot", | |
| 85 "gnuplot_command_splot", | |
| 86 "gnuplot_command_title", | |
| 87 "gnuplot_command_using", | |
| 88 "gnuplot_command_with", | |
| 89 "gnuplot_has_frames", | |
| 90 "history_file", | |
| 91 "history_size", | |
| 92 "ignore_function_time_stamp", | |
| 93 "max_recursion_depth", | |
| 94 "octave_core_file_format", | |
| 95 "octave_core_file_limit", | |
| 96 "octave_core_file_name", | |
| 97 "output_max_field_width", | |
| 98 "output_precision", | |
| 99 "page_output_immediately", | |
| 100 "page_screen_output", | |
| 101 "print_answer_id_name", | |
| 102 "print_empty_dimensions", | |
| 103 "print_rhs_assign_val", | |
| 104 "save_header_format_string", | |
| 105 "save_precision", | |
| 106 "saving_history", | |
| 107 "sighup_dumps_octave_core", | |
| 108 "sigterm_dumps_octave_core", | |
| 109 "silent_functions", | |
| 110 "split_long_rows", | |
| 111 "string_fill_char", | |
| 112 "struct_levels_to_print", | |
| 113 "suppress_verbose_help_message", | |
| 114 "variables_can_hide_functions", | |
| 115 "warn_assign_as_truth_value", | |
| 116 "warn_associativity_change", | |
| 117 "warn_divide_by_zero", | |
| 118 "warn_empty_list_elements", | |
| 119 "warn_fortran_indexing", | |
| 120 "warn_function_name_clash", | |
| 121 "warn_future_time_stamp", | |
| 122 "warn_imag_to_real", | |
| 123 "warn_matlab_incompatible", | |
| 124 "warn_missing_semicolon", | |
| 125 "warn_neg_dim_as_zero", | |
| 126 "warn_num_to_str", | |
| 127 "warn_precedence_change", | |
| 128 "warn_reload_forces_clear", | |
| 129 "warn_resize_on_range_error", | |
| 130 "warn_separator_insert", | |
| 131 "warn_single_quote_string", | |
| 132 "warn_str_to_num", | |
| 133 "warn_undefined_return_values", | |
| 134 "warn_variable_switch_label", | |
| 135 "whos_line_format", | |
| 136 0, | |
| 137 }; | |
| 138 | |
| 139 static void | |
| 140 maybe_warn_former_built_in_variable (const std::string& nm) | |
| 141 { | |
| 142 static bool initialized = false; | |
| 143 | |
| 144 static std::set<std::string> vars; | |
| 145 | |
| 146 if (! initialized) | |
| 147 { | |
| 148 const char **p = former_built_in_variables; | |
| 149 | |
| 150 while (*p) | |
| 151 vars.insert (*p++); | |
|
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152 |
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153 initialized = true; |
| 6253 | 154 } |
| 155 | |
| 156 if (vars.find (nm) != vars.end ()) | |
| 157 warning_with_id ("Octave:built-in-variable-assignment", | |
| 158 "%s is no longer a built-in variable; please read the NEWS file or type `news' for details", | |
| 159 nm.c_str ()); | |
| 160 } | |
| 161 | |
| 162 tree_simple_assignment::tree_simple_assignment | |
| 163 (tree_expression *le, tree_expression *re, | |
| 164 bool plhs, int l, int c, octave_value::assign_op t) | |
| 8038 | 165 : tree_expression (l, c), lhs (le), rhs (re), preserve (plhs), etype (t), |
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166 first_execution (true) { } |
| 6253 | 167 |
| 2980 | 168 tree_simple_assignment::~tree_simple_assignment (void) |
| 169 { | |
| 170 if (! preserve) | |
| 171 delete lhs; | |
| 172 | |
| 173 delete rhs; | |
| 174 } | |
| 175 | |
| 176 octave_value_list | |
| 177 tree_simple_assignment::rvalue (int nargout) | |
| 178 { | |
| 179 octave_value_list retval; | |
| 180 | |
| 181 if (nargout > 1) | |
| 182 error ("invalid number of output arguments for expression X = RHS"); | |
| 183 else | |
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184 retval = rvalue1 (nargout); |
| 2980 | 185 |
| 186 return retval; | |
| 187 } | |
| 188 | |
| 189 octave_value | |
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190 tree_simple_assignment::rvalue1 (int) |
| 2980 | 191 { |
| 3208 | 192 octave_value retval; |
| 2980 | 193 |
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194 if (first_execution && lhs) |
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195 maybe_warn_former_built_in_variable (lhs->name ()); |
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196 |
| 2980 | 197 if (error_state) |
| 3208 | 198 return retval; |
| 2980 | 199 |
| 200 if (rhs) | |
| 201 { | |
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202 octave_value rhs_val = rhs->rvalue1 (); |
| 2980 | 203 |
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204 if (! error_state) |
| 2980 | 205 { |
| 206 if (rhs_val.is_undefined ()) | |
| 207 { | |
| 208 error ("value on right hand side of assignment is undefined"); | |
| 7389 | 209 return retval; |
| 5750 | 210 } |
| 2980 | 211 else |
| 212 { | |
| 7389 | 213 if (rhs_val.is_cs_list ()) |
| 214 { | |
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215 const octave_value_list lst = rhs_val.list_value (); |
| 7389 | 216 |
| 217 if (! lst.empty ()) | |
| 218 rhs_val = lst(0); | |
| 219 else | |
| 220 { | |
| 221 error ("invalid number of elements on RHS of assignment"); | |
| 222 return retval; | |
| 223 } | |
| 224 } | |
| 225 | |
| 2980 | 226 octave_lvalue ult = lhs->lvalue (); |
| 227 | |
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228 if (! error_state) |
| 2980 | 229 { |
| 230 ult.assign (etype, rhs_val); | |
| 231 | |
| 3215 | 232 if (! error_state) |
| 233 { | |
| 3527 | 234 if (etype == octave_value::op_asn_eq) |
| 3215 | 235 retval = rhs_val; |
| 236 else | |
| 237 retval = ult.value (); | |
| 2984 | 238 |
| 3215 | 239 if (print_result ()) |
| 3208 | 240 { |
| 5841 | 241 // We clear any index here so that we can |
| 242 // get the new value of the referenced | |
| 243 // object below, instead of the indexed | |
| 244 // value (which should be the same as the | |
| 245 // right hand side value). | |
| 2980 | 246 |
| 5841 | 247 ult.clear_index (); |
| 3208 | 248 |
| 5841 | 249 octave_value lhs_val = ult.value (); |
| 3208 | 250 |
| 5841 | 251 if (! error_state) |
| 252 lhs_val.print_with_name (octave_stdout, | |
| 253 lhs->name ()); | |
| 2980 | 254 } |
| 255 } | |
| 256 } | |
| 257 } | |
| 258 } | |
| 259 } | |
| 260 | |
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261 first_execution = false; |
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262 |
| 3208 | 263 return retval; |
| 2980 | 264 } |
| 265 | |
| 3536 | 266 std::string |
| 2980 | 267 tree_simple_assignment::oper (void) const |
| 268 { | |
| 269 return octave_value::assign_op_as_string (etype); | |
| 270 } | |
| 271 | |
| 5861 | 272 tree_expression * |
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273 tree_simple_assignment::dup (symbol_table::scope_id scope, |
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274 symbol_table::context_id context) const |
| 5861 | 275 { |
| 276 tree_simple_assignment *new_sa | |
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277 = new tree_simple_assignment (lhs ? lhs->dup (scope, context) : 0, |
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278 rhs ? rhs->dup (scope, context) : 0, |
| 5861 | 279 preserve, etype); |
| 280 | |
| 281 new_sa->copy_base (*this); | |
| 282 | |
| 283 return new_sa; | |
| 284 } | |
| 285 | |
| 2980 | 286 void |
| 287 tree_simple_assignment::accept (tree_walker& tw) | |
| 288 { | |
| 289 tw.visit_simple_assignment (*this); | |
| 290 } | |
| 291 | |
| 292 // Multi-valued assignment expressions. | |
| 293 | |
| 6253 | 294 tree_multi_assignment::tree_multi_assignment |
| 295 (tree_argument_list *lst, tree_expression *r, | |
| 296 bool plhs, int l, int c, octave_value::assign_op t) | |
| 8038 | 297 : tree_expression (l, c), lhs (lst), rhs (r), preserve (plhs), etype (t), |
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298 first_execution (true) { } |
| 6253 | 299 |
| 2980 | 300 tree_multi_assignment::~tree_multi_assignment (void) |
| 301 { | |
| 302 if (! preserve) | |
| 303 delete lhs; | |
| 304 | |
| 305 delete rhs; | |
| 306 } | |
| 307 | |
| 308 octave_value | |
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309 tree_multi_assignment::rvalue1 (int nargout) |
| 2980 | 310 { |
| 311 octave_value retval; | |
| 312 | |
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313 const octave_value_list tmp = rvalue (nargout); |
| 2980 | 314 |
| 315 if (! tmp.empty ()) | |
| 316 retval = tmp(0); | |
| 317 | |
| 318 return retval; | |
| 319 } | |
| 320 | |
| 5775 | 321 // FIXME -- this works, but it would look a little better if |
| 2984 | 322 // it were broken up into a couple of separate functions. |
| 323 | |
| 2980 | 324 octave_value_list |
| 325 tree_multi_assignment::rvalue (int) | |
| 326 { | |
| 3208 | 327 octave_value_list retval; |
| 2980 | 328 |
| 329 if (error_state) | |
| 3208 | 330 return retval; |
| 2980 | 331 |
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332 if (first_execution) |
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333 { |
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334 for (tree_argument_list::iterator p = lhs->begin (); p != lhs->end (); p++) |
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335 { |
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336 tree_expression *lhs_expr = *p; |
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337 |
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338 if (lhs_expr) |
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339 maybe_warn_former_built_in_variable (lhs_expr->name ()); |
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340 } |
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341 } |
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342 |
| 2980 | 343 if (rhs) |
| 344 { | |
| 5846 | 345 std::list<octave_lvalue> lvalue_list = lhs->lvalue_list (); |
| 3977 | 346 |
| 347 if (error_state) | |
| 348 return retval; | |
| 2980 | 349 |
| 5846 | 350 int n_out = 0; |
| 351 | |
| 352 for (std::list<octave_lvalue>::const_iterator p = lvalue_list.begin (); | |
| 353 p != lvalue_list.end (); | |
| 354 p++) | |
| 355 n_out += p->numel (); | |
| 356 | |
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357 // The following trick is used to keep rhs_val constant. |
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358 const octave_value_list rhs_val1 = rhs->rvalue (n_out); |
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359 const octave_value_list rhs_val = (rhs_val1.length () == 1 && rhs_val1(0).is_cs_list () |
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360 ? rhs_val1(0).list_value () : rhs_val1); |
| 2980 | 361 |
| 3977 | 362 if (error_state) |
| 363 return retval; | |
| 2980 | 364 |
| 3977 | 365 if (rhs_val.empty ()) |
| 366 { | |
| 5846 | 367 if (n_out > 0) |
| 368 { | |
| 369 error ("value on right hand side of assignment is undefined"); | |
| 370 return retval; | |
| 371 } | |
| 3977 | 372 } |
| 373 else | |
| 374 { | |
| 5846 | 375 octave_idx_type k = 0; |
| 2980 | 376 |
| 5846 | 377 octave_idx_type n = rhs_val.length (); |
| 2980 | 378 |
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379 // To avoid copying per elements and possible optimizations, we |
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380 // postpone joining the final values. |
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381 std::list<octave_value_list> retval_list; |
| 3208 | 382 |
| 5846 | 383 tree_argument_list::iterator q = lhs->begin (); |
| 384 | |
| 385 for (std::list<octave_lvalue>::iterator p = lvalue_list.begin (); | |
| 386 p != lvalue_list.end (); | |
| 4219 | 387 p++) |
| 3977 | 388 { |
| 5846 | 389 tree_expression *lhs_elt = *q++; |
| 390 | |
| 391 octave_lvalue ult = *p; | |
| 392 | |
| 393 octave_idx_type nel = ult.numel (); | |
| 3977 | 394 |
| 5846 | 395 if (nel > 1) |
| 3977 | 396 { |
| 5846 | 397 if (k + nel <= n) |
| 398 { | |
| 399 if (etype == octave_value::op_asn_eq) | |
| 400 { | |
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401 // This won't do a copy. |
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402 octave_value_list ovl = rhs_val.slice (k, nel); |
| 5846 | 403 |
| 404 ult.assign (etype, octave_value (ovl, true)); | |
| 2980 | 405 |
| 5846 | 406 if (! error_state) |
| 407 { | |
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408 retval_list.push_back (ovl); |
| 5846 | 409 |
| 410 k += nel; | |
| 411 } | |
| 412 } | |
| 413 else | |
| 414 { | |
| 415 std::string op = octave_value::assign_op_as_string (etype); | |
| 416 error ("operator %s unsupported for comma-separated list assignment", | |
| 417 op.c_str ()); | |
| 418 } | |
| 5750 | 419 } |
| 5846 | 420 else |
| 421 error ("some elements undefined in return list"); | |
| 422 } | |
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423 else if (nel == 1) |
| 5846 | 424 { |
| 425 if (k < n) | |
| 3977 | 426 { |
| 427 ult.assign (etype, rhs_val(k)); | |
| 428 | |
| 429 if (! error_state) | |
| 3208 | 430 { |
| 3977 | 431 if (etype == octave_value::op_asn_eq) |
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432 retval_list.push_back (rhs_val(k)); |
| 3208 | 433 else |
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434 retval_list.push_back (ult.value ()); |
| 5846 | 435 |
| 436 k++; | |
| 2980 | 437 } |
| 438 } | |
| 3208 | 439 else |
| 3977 | 440 error ("element number %d undefined in return list", k+1); |
| 5846 | 441 } |
| 2980 | 442 |
| 5846 | 443 if (error_state) |
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444 break; |
| 5846 | 445 else if (print_result ()) |
| 446 { | |
| 447 // We clear any index here so that we can get | |
| 448 // the new value of the referenced object below, | |
| 449 // instead of the indexed value (which should be | |
| 450 // the same as the right hand side value). | |
| 3977 | 451 |
| 5846 | 452 ult.clear_index (); |
| 3208 | 453 |
| 5846 | 454 octave_value lhs_val = ult.value (); |
| 3977 | 455 |
| 5846 | 456 if (! error_state) |
| 457 lhs_val.print_with_name (octave_stdout, | |
| 458 lhs_elt->name ()); | |
| 2980 | 459 } |
| 3977 | 460 |
| 461 if (error_state) | |
| 462 break; | |
| 463 | |
| 2980 | 464 } |
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465 |
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466 // Concatenate return values. |
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467 retval = retval_list; |
| 2980 | 468 } |
| 469 } | |
| 470 | |
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471 first_execution = false; |
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472 |
| 3208 | 473 return retval; |
| 2980 | 474 } |
| 475 | |
| 3536 | 476 std::string |
| 3208 | 477 tree_multi_assignment::oper (void) const |
| 478 { | |
| 479 return octave_value::assign_op_as_string (etype); | |
| 480 } | |
| 481 | |
| 5861 | 482 tree_expression * |
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483 tree_multi_assignment::dup (symbol_table::scope_id scope, |
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484 symbol_table::context_id context) const |
| 5861 | 485 { |
| 486 tree_multi_assignment *new_ma | |
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487 = new tree_multi_assignment (lhs ? lhs->dup (scope, context) : 0, |
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488 rhs ? rhs->dup (scope, context) : 0, |
| 5861 | 489 preserve, etype); |
| 490 | |
| 491 new_ma->copy_base (*this); | |
| 492 | |
| 493 return new_ma; | |
| 494 } | |
| 495 | |
| 2980 | 496 void |
| 497 tree_multi_assignment::accept (tree_walker& tw) | |
| 498 { | |
| 499 tw.visit_multi_assignment (*this); | |
| 500 } | |
| 501 | |
| 502 /* | |
| 503 ;;; Local Variables: *** | |
| 504 ;;; mode: C++ *** | |
| 505 ;;; End: *** | |
| 506 */ |