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annotate src/pt-assign.cc @ 10832:1b2fcd122c6a

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allow user detect ignored outputs in m-functions
author Jaroslav Hajek <highegg@gmail.com>
date Thu, 29 Jul 2010 12:45:23 +0200
parents 57a59eae83cc
children fd0a3ac60b0e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2
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3 Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2004, 2005,
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John W. Eaton <jwe@octave.org>
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4 2006, 2007, 2008, 2009 John W. Eaton
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5
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
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6 This file is part of Octave.
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7
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
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8 Octave is free software; you can redistribute it and/or modify it
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9 under the terms of the GNU General Public License as published by the
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10 Free Software Foundation; either version 3 of the License, or (at your
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11 option) any later version.
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12
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
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13 Octave is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with Octave; see the file COPYING. If not, see
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20 <http://www.gnu.org/licenses/>.
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21
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
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22 */
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23
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
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24 #ifdef HAVE_CONFIG_H
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25 #include <config.h>
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26 #endif
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27
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28 #include <iostream>
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29 #include <set>
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30
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31 #include "defun.h"
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32 #include "error.h"
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33 #include "gripes.h"
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34 #include "input.h"
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35 #include "oct-obj.h"
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36 #include "oct-lvalue.h"
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37 #include "pager.h"
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38 #include "ov.h"
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39 #include "pt-arg-list.h"
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40 #include "pt-bp.h"
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41 #include "pt-assign.h"
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42 #include "pt-walk.h"
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43 #include "utils.h"
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44 #include "variables.h"
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45
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46 // Simple assignment expressions.
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47
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48 // FIXME -- the following variable and the function that uses it
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49 // should be removed from some future version of Octave.
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50
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51 static const char *former_built_in_variables[] =
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52 {
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53 "DEFAULT_EXEC_PATH",
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54 "DEFAULT_LOADPATH",
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55 "EDITOR",
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56 "EXEC_PATH",
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57 "FFTW_WISDOM_PROGRAM",
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58 "IMAGEPATH",
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59 "INFO_FILE",
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60 "INFO_PROGRAM",
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61 "LOADPATH",
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62 "MAKEINFO_PROGRAM",
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63 "PAGER",
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64 "PS1",
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65 "PS2",
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66 "PS4",
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67 "__kluge_procbuf_delay__",
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68 "automatic_replot",
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69 "beep_on_error",
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70 "completion_append_char",
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71 "crash_dumps_octave_core",
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72 "current_script_file_name",
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73 "debug_on_error",
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74 "debug_on_interrupt",
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75 "debug_on_warning",
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76 "debug_symtab_lookups",
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77 "default_save_format",
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78 "echo_executing_commands",
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79 "fixed_point_format",
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80 "gnuplot_binary",
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81 "gnuplot_command_axes",
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82 "gnuplot_command_end",
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83 "gnuplot_command_plot",
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84 "gnuplot_command_replot",
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85 "gnuplot_command_splot",
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86 "gnuplot_command_title",
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87 "gnuplot_command_using",
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88 "gnuplot_command_with",
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89 "gnuplot_has_frames",
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90 "history_file",
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91 "history_size",
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92 "ignore_function_time_stamp",
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93 "max_recursion_depth",
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94 "octave_core_file_format",
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95 "octave_core_file_limit",
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96 "octave_core_file_name",
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97 "output_max_field_width",
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98 "output_precision",
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99 "page_output_immediately",
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100 "page_screen_output",
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101 "print_answer_id_name",
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102 "print_empty_dimensions",
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103 "print_rhs_assign_val",
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104 "save_header_format_string",
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105 "save_precision",
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106 "saving_history",
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107 "sighup_dumps_octave_core",
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108 "sigterm_dumps_octave_core",
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109 "silent_functions",
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110 "split_long_rows",
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111 "string_fill_char",
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112 "struct_levels_to_print",
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113 "suppress_verbose_help_message",
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114 "variables_can_hide_functions",
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115 "warn_assign_as_truth_value",
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116 "warn_associativity_change",
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117 "warn_divide_by_zero",
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118 "warn_empty_list_elements",
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119 "warn_fortran_indexing",
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120 "warn_function_name_clash",
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121 "warn_future_time_stamp",
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122 "warn_imag_to_real",
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123 "warn_matlab_incompatible",
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124 "warn_missing_semicolon",
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125 "warn_neg_dim_as_zero",
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126 "warn_num_to_str",
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127 "warn_precedence_change",
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128 "warn_reload_forces_clear",
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129 "warn_resize_on_range_error",
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130 "warn_separator_insert",
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131 "warn_single_quote_string",
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132 "warn_str_to_num",
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133 "warn_undefined_return_values",
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134 "warn_variable_switch_label",
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135 "whos_line_format",
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136 0,
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137 };
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138
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139 static void
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140 maybe_warn_former_built_in_variable (const std::string& nm)
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141 {
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142 static bool initialized = false;
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143
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144 static std::set<std::string> vars;
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145
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146 if (! initialized)
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147 {
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148 const char **p = former_built_in_variables;
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149
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150 while (*p)
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151 vars.insert (*p++);
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152
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153 initialized = true;
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154 }
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155
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156 if (vars.find (nm) != vars.end ())
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157 {
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158 const char *nm_c_str = nm.c_str ();
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159
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160 warning_with_id ("Octave:built-in-variable-assignment",
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161 "%s is now a function instead of a built-in variable. By assigning to %s, you have created a variable that hides the function %s. To remove the variable and restore the function, type \"clear %s\"",
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162 nm_c_str, nm_c_str, nm_c_str, nm_c_str);
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163 }
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164 }
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165
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166 tree_simple_assignment::tree_simple_assignment
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167 (tree_expression *le, tree_expression *re,
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168 bool plhs, int l, int c, octave_value::assign_op t)
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169 : tree_expression (l, c), lhs (le), rhs (re), preserve (plhs), etype (t),
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170 first_execution (true) { }
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171
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172 tree_simple_assignment::~tree_simple_assignment (void)
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173 {
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174 if (! preserve)
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175 delete lhs;
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176
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177 delete rhs;
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178 }
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179
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180 octave_value_list
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181 tree_simple_assignment::rvalue (int nargout)
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182 {
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183 octave_value_list retval;
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184
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185 if (nargout > 1)
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186 error ("invalid number of output arguments for expression X = RHS");
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187 else
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188 retval = rvalue1 (nargout);
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189
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190 return retval;
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191 }
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192
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193 octave_value
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194 tree_simple_assignment::rvalue1 (int)
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195 {
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196 octave_value retval;
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197
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198 if (first_execution && lhs)
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199 maybe_warn_former_built_in_variable (lhs->name ());
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200
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201 if (error_state)
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202 return retval;
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203
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204 if (rhs)
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205 {
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206 octave_value rhs_val = rhs->rvalue1 ();
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207
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208 if (! error_state)
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209 {
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210 if (rhs_val.is_undefined ())
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211 {
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212 error ("value on right hand side of assignment is undefined");
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213 return retval;
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214 }
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215 else
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216 {
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217 if (rhs_val.is_cs_list ())
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218 {
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219 const octave_value_list lst = rhs_val.list_value ();
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220
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221 if (! lst.empty ())
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222 rhs_val = lst(0);
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223 else
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224 {
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225 error ("invalid number of elements on RHS of assignment");
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226 return retval;
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227 }
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228 }
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229
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230 octave_lvalue ult = lhs->lvalue ();
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231
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232 if (ult.numel () != 1)
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233 gripe_nonbraced_cs_list_assignment ();
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234
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235 if (! error_state)
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236 {
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237 ult.assign (etype, rhs_val);
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238
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239 if (! error_state)
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240 {
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241 if (etype == octave_value::op_asn_eq)
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242 retval = rhs_val;
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243 else
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244 retval = ult.value ();
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245
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246 if (print_result ())
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247 {
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248 // We clear any index here so that we can
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249 // get the new value of the referenced
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250 // object below, instead of the indexed
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251 // value (which should be the same as the
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252 // right hand side value).
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253
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diff changeset
254 ult.clear_index ();
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255
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256 octave_value lhs_val = ult.value ();
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257
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258 if (! error_state)
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259 lhs_val.print_with_name (octave_stdout,
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260 lhs->name ());
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261 }
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262 }
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263 }
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264 }
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265 }
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266 }
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267
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268 first_execution = false;
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269
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270 return retval;
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271 }
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272
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273 std::string
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274 tree_simple_assignment::oper (void) const
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275 {
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276 return octave_value::assign_op_as_string (etype);
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277 }
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278
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279 tree_expression *
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280 tree_simple_assignment::dup (symbol_table::scope_id scope,
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281 symbol_table::context_id context) const
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282 {
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283 tree_simple_assignment *new_sa
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284 = new tree_simple_assignment (lhs ? lhs->dup (scope, context) : 0,
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285 rhs ? rhs->dup (scope, context) : 0,
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286 preserve, etype);
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287
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288 new_sa->copy_base (*this);
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289
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290 return new_sa;
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291 }
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292
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293 void
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294 tree_simple_assignment::accept (tree_walker& tw)
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295 {
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296 tw.visit_simple_assignment (*this);
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297 }
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298
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299 // Multi-valued assignment expressions.
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300
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301 tree_multi_assignment::tree_multi_assignment
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302 (tree_argument_list *lst, tree_expression *r,
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303 bool plhs, int l, int c)
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304 : tree_expression (l, c), lhs (lst), rhs (r), preserve (plhs),
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305 first_execution (true) { }
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306
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307 tree_multi_assignment::~tree_multi_assignment (void)
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308 {
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
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diff changeset
309 if (! preserve)
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
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parents:
diff changeset
310 delete lhs;
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
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311
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
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parents:
diff changeset
312 delete rhs;
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
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diff changeset
313 }
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
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314
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
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diff changeset
315 octave_value
8658
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John W. Eaton <jwe@octave.org>
parents: 8580
diff changeset
316 tree_multi_assignment::rvalue1 (int nargout)
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317 {
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
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diff changeset
318 octave_value retval;
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
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parents:
diff changeset
319
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parents: 8580
diff changeset
320 const octave_value_list tmp = rvalue (nargout);
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321
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
322 if (! tmp.empty ())
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
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parents:
diff changeset
323 retval = tmp(0);
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
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parents:
diff changeset
324
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
325 return retval;
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
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parents:
diff changeset
326 }
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diff changeset
327
5775
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parents: 5750
diff changeset
328 // FIXME -- this works, but it would look a little better if
2984
84c33881d0bc [project @ 1997-05-16 05:14:33 by jwe]
jwe
parents: 2982
diff changeset
329 // it were broken up into a couple of separate functions.
84c33881d0bc [project @ 1997-05-16 05:14:33 by jwe]
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diff changeset
330
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diff changeset
331 octave_value_list
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diff changeset
332 tree_multi_assignment::rvalue (int)
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
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diff changeset
333 {
3208
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diff changeset
334 octave_value_list retval;
2980
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335
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diff changeset
336 if (error_state)
3208
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diff changeset
337 return retval;
2980
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338
8037
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parents: 8011
diff changeset
339 if (first_execution)
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parents: 8011
diff changeset
340 {
0be8cf23b95c check for obsolete built-in variable assignment at first execution rather than parse time
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parents: 8011
diff changeset
341 for (tree_argument_list::iterator p = lhs->begin (); p != lhs->end (); p++)
0be8cf23b95c check for obsolete built-in variable assignment at first execution rather than parse time
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parents: 8011
diff changeset
342 {
0be8cf23b95c check for obsolete built-in variable assignment at first execution rather than parse time
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parents: 8011
diff changeset
343 tree_expression *lhs_expr = *p;
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parents: 8011
diff changeset
344
0be8cf23b95c check for obsolete built-in variable assignment at first execution rather than parse time
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parents: 8011
diff changeset
345 if (lhs_expr)
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parents: 8011
diff changeset
346 maybe_warn_former_built_in_variable (lhs_expr->name ());
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parents: 8011
diff changeset
347 }
0be8cf23b95c check for obsolete built-in variable assignment at first execution rather than parse time
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parents: 8011
diff changeset
348 }
0be8cf23b95c check for obsolete built-in variable assignment at first execution rather than parse time
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parents: 8011
diff changeset
349
2980
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350 if (rhs)
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351 {
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352 std::list<octave_lvalue> lvalue_list = lhs->lvalue_list ();
3977
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diff changeset
353
95663a3a2682 [project @ 2002-07-05 17:43:37 by jwe]
jwe
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diff changeset
354 if (error_state)
10315
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10230
diff changeset
355 return retval;
2980
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diff changeset
356
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1b2fcd122c6a allow user detect ignored outputs in m-functions
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parents: 10315
diff changeset
357 octave_idx_type n_out = 0;
5846
db0598f94c0f [project @ 2006-06-07 18:16:16 by jwe]
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parents: 5841
diff changeset
358
db0598f94c0f [project @ 2006-06-07 18:16:16 by jwe]
jwe
parents: 5841
diff changeset
359 for (std::list<octave_lvalue>::const_iterator p = lvalue_list.begin ();
10315
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10230
diff changeset
360 p != lvalue_list.end ();
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10230
diff changeset
361 p++)
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10230
diff changeset
362 n_out += p->numel ();
5846
db0598f94c0f [project @ 2006-06-07 18:16:16 by jwe]
jwe
parents: 5841
diff changeset
363
8580
188d38a553c7 further indexing optimization touches
Jaroslav Hajek <highegg@gmail.com>
parents: 8313
diff changeset
364 // The following trick is used to keep rhs_val constant.
10832
1b2fcd122c6a allow user detect ignored outputs in m-functions
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parents: 10315
diff changeset
365 const octave_value_list rhs_val1 = rhs->rvalue (n_out, &lvalue_list);
8580
188d38a553c7 further indexing optimization touches
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parents: 8313
diff changeset
366 const octave_value_list rhs_val = (rhs_val1.length () == 1 && rhs_val1(0).is_cs_list ()
188d38a553c7 further indexing optimization touches
Jaroslav Hajek <highegg@gmail.com>
parents: 8313
diff changeset
367 ? rhs_val1(0).list_value () : rhs_val1);
2980
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
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diff changeset
368
3977
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diff changeset
369 if (error_state)
10315
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10230
diff changeset
370 return retval;
2980
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
371
9782
eead00a7df05 don't skip empty multi-assignments to allow side effects
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parents: 9421
diff changeset
372 octave_idx_type k = 0;
eead00a7df05 don't skip empty multi-assignments to allow side effects
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diff changeset
373
eead00a7df05 don't skip empty multi-assignments to allow side effects
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diff changeset
374 octave_idx_type n = rhs_val.length ();
eead00a7df05 don't skip empty multi-assignments to allow side effects
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diff changeset
375
eead00a7df05 don't skip empty multi-assignments to allow side effects
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diff changeset
376 // To avoid copying per elements and possible optimizations, we
eead00a7df05 don't skip empty multi-assignments to allow side effects
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parents: 9421
diff changeset
377 // postpone joining the final values.
eead00a7df05 don't skip empty multi-assignments to allow side effects
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parents: 9421
diff changeset
378 std::list<octave_value_list> retval_list;
2980
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
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diff changeset
379
9782
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Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
380 tree_argument_list::iterator q = lhs->begin ();
2980
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
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parents:
diff changeset
381
9782
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
382 for (std::list<octave_lvalue>::iterator p = lvalue_list.begin ();
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
383 p != lvalue_list.end ();
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
384 p++)
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
385 {
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
386 tree_expression *lhs_elt = *q++;
5846
db0598f94c0f [project @ 2006-06-07 18:16:16 by jwe]
jwe
parents: 5841
diff changeset
387
9782
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
388 octave_lvalue ult = *p;
5846
db0598f94c0f [project @ 2006-06-07 18:16:16 by jwe]
jwe
parents: 5841
diff changeset
389
9782
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
390 octave_idx_type nel = ult.numel ();
3977
95663a3a2682 [project @ 2002-07-05 17:43:37 by jwe]
jwe
parents: 3965
diff changeset
391
9782
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
392 if (nel != 1)
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
393 {
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
394 if (k + nel <= n)
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
395 {
10230
0a5a769b8fc0 disallow computed multiple assignment
Jaroslav Hajek <highegg@gmail.com>
parents: 10227
diff changeset
396 // This won't do a copy.
0a5a769b8fc0 disallow computed multiple assignment
Jaroslav Hajek <highegg@gmail.com>
parents: 10227
diff changeset
397 octave_value_list ovl = rhs_val.slice (k, nel);
5846
db0598f94c0f [project @ 2006-06-07 18:16:16 by jwe]
jwe
parents: 5841
diff changeset
398
10230
0a5a769b8fc0 disallow computed multiple assignment
Jaroslav Hajek <highegg@gmail.com>
parents: 10227
diff changeset
399 ult.assign (octave_value::op_asn_eq, octave_value (ovl, true));
2980
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
400
10230
0a5a769b8fc0 disallow computed multiple assignment
Jaroslav Hajek <highegg@gmail.com>
parents: 10227
diff changeset
401 if (! error_state)
0a5a769b8fc0 disallow computed multiple assignment
Jaroslav Hajek <highegg@gmail.com>
parents: 10227
diff changeset
402 {
0a5a769b8fc0 disallow computed multiple assignment
Jaroslav Hajek <highegg@gmail.com>
parents: 10227
diff changeset
403 retval_list.push_back (ovl);
5846
db0598f94c0f [project @ 2006-06-07 18:16:16 by jwe]
jwe
parents: 5841
diff changeset
404
10230
0a5a769b8fc0 disallow computed multiple assignment
Jaroslav Hajek <highegg@gmail.com>
parents: 10227
diff changeset
405 k += nel;
9782
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
406 }
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
407 }
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
408 else
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
409 error ("some elements undefined in return list");
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
410 }
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
411 else
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
412 {
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
413 if (k < n)
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
414 {
10230
0a5a769b8fc0 disallow computed multiple assignment
Jaroslav Hajek <highegg@gmail.com>
parents: 10227
diff changeset
415 ult.assign (octave_value::op_asn_eq, rhs_val(k));
3977
95663a3a2682 [project @ 2002-07-05 17:43:37 by jwe]
jwe
parents: 3965
diff changeset
416
10227
d3fc22c3071c omit ~ values from multi-assignment return lists
Jaroslav Hajek <highegg@gmail.com>
parents: 10160
diff changeset
417 if (ult.is_black_hole ())
d3fc22c3071c omit ~ values from multi-assignment return lists
Jaroslav Hajek <highegg@gmail.com>
parents: 10160
diff changeset
418 {
d3fc22c3071c omit ~ values from multi-assignment return lists
Jaroslav Hajek <highegg@gmail.com>
parents: 10160
diff changeset
419 k++;
d3fc22c3071c omit ~ values from multi-assignment return lists
Jaroslav Hajek <highegg@gmail.com>
parents: 10160
diff changeset
420 continue;
d3fc22c3071c omit ~ values from multi-assignment return lists
Jaroslav Hajek <highegg@gmail.com>
parents: 10160
diff changeset
421 }
d3fc22c3071c omit ~ values from multi-assignment return lists
Jaroslav Hajek <highegg@gmail.com>
parents: 10160
diff changeset
422 else if (! error_state)
9782
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
423 {
10230
0a5a769b8fc0 disallow computed multiple assignment
Jaroslav Hajek <highegg@gmail.com>
parents: 10227
diff changeset
424 retval_list.push_back (rhs_val(k));
5846
db0598f94c0f [project @ 2006-06-07 18:16:16 by jwe]
jwe
parents: 5841
diff changeset
425
9782
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
426 k++;
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
427 }
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
428 }
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
429 else
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
430 error ("element number %d undefined in return list", k+1);
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
431 }
2980
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
432
9782
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
433 if (error_state)
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
434 break;
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
435 else if (print_result ())
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
436 {
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
437 // We clear any index here so that we can get
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
438 // the new value of the referenced object below,
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
439 // instead of the indexed value (which should be
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
440 // the same as the right hand side value).
3977
95663a3a2682 [project @ 2002-07-05 17:43:37 by jwe]
jwe
parents: 3965
diff changeset
441
9782
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
442 ult.clear_index ();
3208
e8a7163701be [project @ 1998-11-03 05:12:47 by jwe]
jwe
parents: 2991
diff changeset
443
9782
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
444 octave_value lhs_val = ult.value ();
3977
95663a3a2682 [project @ 2002-07-05 17:43:37 by jwe]
jwe
parents: 3965
diff changeset
445
9782
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
446 if (! error_state)
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
447 lhs_val.print_with_name (octave_stdout,
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
448 lhs_elt->name ());
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
449 }
3977
95663a3a2682 [project @ 2002-07-05 17:43:37 by jwe]
jwe
parents: 3965
diff changeset
450
9782
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
451 if (error_state)
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
452 break;
3977
95663a3a2682 [project @ 2002-07-05 17:43:37 by jwe]
jwe
parents: 3965
diff changeset
453
9782
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
454 }
eead00a7df05 don't skip empty multi-assignments to allow side effects
Jaroslav Hajek <highegg@gmail.com>
parents: 9421
diff changeset
455
eead00a7df05 don't skip empty multi-assignments to allow side effects
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parents: 9421
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456 // Concatenate return values.
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parents: 9421
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457 retval = retval_list;
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parents: 9421
diff changeset
458
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459 }
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460
8037
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parents: 8011
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461 first_execution = false;
0be8cf23b95c check for obsolete built-in variable assignment at first execution rather than parse time
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parents: 8011
diff changeset
462
3208
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463 return retval;
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464 }
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465
3536
e8fbc8c3d6d9 [project @ 2000-02-02 12:01:00 by jwe]
jwe
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diff changeset
466 std::string
3208
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jwe
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467 tree_multi_assignment::oper (void) const
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jwe
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468 {
10230
0a5a769b8fc0 disallow computed multiple assignment
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parents: 10227
diff changeset
469 return octave_value::assign_op_as_string (op_type ());
3208
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470 }
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jwe
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diff changeset
471
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jwe
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diff changeset
472 tree_expression *
7767
71f068b22fcc scope and context fixes for function handles
John W. Eaton <jwe@octave.org>
parents: 7389
diff changeset
473 tree_multi_assignment::dup (symbol_table::scope_id scope,
10315
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parents: 10230
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474 symbol_table::context_id context) const
5861
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jwe
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diff changeset
475 {
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
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476 tree_multi_assignment *new_ma
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parents: 7389
diff changeset
477 = new tree_multi_assignment (lhs ? lhs->dup (scope, context) : 0,
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John W. Eaton <jwe@octave.org>
parents: 10230
diff changeset
478 rhs ? rhs->dup (scope, context) : 0,
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10230
diff changeset
479 preserve);
5861
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diff changeset
480
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
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diff changeset
481 new_ma->copy_base (*this);
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482
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
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483 return new_ma;
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484 }
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
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diff changeset
485
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486 void
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487 tree_multi_assignment::accept (tree_walker& tw)
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488 {
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
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489 tw.visit_multi_assignment (*this);
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490 }