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update copyright notices
author John W. Eaton <jwe@octave.org>
date Fri, 14 Jan 2011 05:47:45 -0500
parents 1b2fcd122c6a
children 922bfdd80413
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1 /*
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2
11523
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3 Copyright (C) 1996-2011 John W. Eaton
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4
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5 This file is part of Octave.
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6
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
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7 Octave is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 3 of the License, or (at your
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10 option) any later version.
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11
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
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12 Octave is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with Octave; see the file COPYING. If not, see
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19 <http://www.gnu.org/licenses/>.
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20
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21 */
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22
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
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23 #ifdef HAVE_CONFIG_H
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24 #include <config.h>
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25 #endif
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26
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27 #include <iostream>
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28 #include <set>
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29
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30 #include "defun.h"
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31 #include "error.h"
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32 #include "gripes.h"
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33 #include "input.h"
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34 #include "oct-obj.h"
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35 #include "oct-lvalue.h"
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36 #include "pager.h"
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37 #include "ov.h"
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38 #include "pt-arg-list.h"
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39 #include "pt-bp.h"
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40 #include "pt-assign.h"
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41 #include "pt-walk.h"
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42 #include "utils.h"
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43 #include "variables.h"
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44
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45 // Simple assignment expressions.
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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
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50 static const char *former_built_in_variables[] =
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51 {
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52 "DEFAULT_EXEC_PATH",
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53 "DEFAULT_LOADPATH",
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54 "EDITOR",
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55 "EXEC_PATH",
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56 "FFTW_WISDOM_PROGRAM",
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57 "IMAGEPATH",
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58 "INFO_FILE",
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59 "INFO_PROGRAM",
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60 "LOADPATH",
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61 "MAKEINFO_PROGRAM",
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62 "PAGER",
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63 "PS1",
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64 "PS2",
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65 "PS4",
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66 "__kluge_procbuf_delay__",
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67 "automatic_replot",
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68 "beep_on_error",
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69 "completion_append_char",
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70 "crash_dumps_octave_core",
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71 "current_script_file_name",
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72 "debug_on_error",
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73 "debug_on_interrupt",
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74 "debug_on_warning",
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75 "debug_symtab_lookups",
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76 "default_save_format",
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77 "echo_executing_commands",
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78 "fixed_point_format",
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79 "gnuplot_binary",
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80 "gnuplot_command_axes",
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81 "gnuplot_command_end",
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82 "gnuplot_command_plot",
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83 "gnuplot_command_replot",
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84 "gnuplot_command_splot",
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85 "gnuplot_command_title",
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86 "gnuplot_command_using",
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87 "gnuplot_command_with",
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88 "gnuplot_has_frames",
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89 "history_file",
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90 "history_size",
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91 "ignore_function_time_stamp",
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92 "max_recursion_depth",
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93 "octave_core_file_format",
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94 "octave_core_file_limit",
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95 "octave_core_file_name",
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96 "output_max_field_width",
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97 "output_precision",
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98 "page_output_immediately",
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99 "page_screen_output",
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100 "print_answer_id_name",
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101 "print_empty_dimensions",
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102 "print_rhs_assign_val",
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103 "save_header_format_string",
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104 "save_precision",
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105 "saving_history",
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106 "sighup_dumps_octave_core",
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107 "sigterm_dumps_octave_core",
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108 "silent_functions",
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109 "split_long_rows",
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110 "string_fill_char",
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111 "struct_levels_to_print",
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112 "suppress_verbose_help_message",
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113 "variables_can_hide_functions",
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114 "warn_assign_as_truth_value",
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115 "warn_associativity_change",
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116 "warn_divide_by_zero",
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117 "warn_empty_list_elements",
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118 "warn_fortran_indexing",
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119 "warn_function_name_clash",
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120 "warn_future_time_stamp",
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121 "warn_imag_to_real",
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122 "warn_matlab_incompatible",
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123 "warn_missing_semicolon",
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124 "warn_neg_dim_as_zero",
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125 "warn_num_to_str",
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126 "warn_precedence_change",
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127 "warn_reload_forces_clear",
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128 "warn_resize_on_range_error",
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129 "warn_separator_insert",
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130 "warn_single_quote_string",
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131 "warn_str_to_num",
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132 "warn_undefined_return_values",
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133 "warn_variable_switch_label",
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134 "whos_line_format",
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135 0,
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136 };
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137
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138 static void
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139 maybe_warn_former_built_in_variable (const std::string& nm)
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140 {
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141 static bool initialized = false;
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142
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143 static std::set<std::string> vars;
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144
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145 if (! initialized)
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146 {
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147 const char **p = former_built_in_variables;
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148
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149 while (*p)
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150 vars.insert (*p++);
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151
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152 initialized = true;
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153 }
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154
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155 if (vars.find (nm) != vars.end ())
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156 {
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157 const char *nm_c_str = nm.c_str ();
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158
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159 warning_with_id ("Octave:built-in-variable-assignment",
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160 "%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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161 nm_c_str, nm_c_str, nm_c_str, nm_c_str);
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162 }
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163 }
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164
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165 tree_simple_assignment::tree_simple_assignment
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166 (tree_expression *le, tree_expression *re,
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167 bool plhs, int l, int c, octave_value::assign_op t)
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168 : tree_expression (l, c), lhs (le), rhs (re), preserve (plhs), etype (t),
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169 first_execution (true) { }
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170
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171 tree_simple_assignment::~tree_simple_assignment (void)
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172 {
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173 if (! preserve)
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174 delete lhs;
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175
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176 delete rhs;
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177 }
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178
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179 octave_value_list
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180 tree_simple_assignment::rvalue (int nargout)
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181 {
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182 octave_value_list retval;
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183
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184 if (nargout > 1)
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185 error ("invalid number of output arguments for expression X = RHS");
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186 else
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187 retval = rvalue1 (nargout);
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188
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189 return retval;
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190 }
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191
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192 octave_value
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193 tree_simple_assignment::rvalue1 (int)
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194 {
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195 octave_value retval;
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196
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197 if (first_execution && lhs)
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198 maybe_warn_former_built_in_variable (lhs->name ());
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199
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200 if (error_state)
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201 return retval;
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202
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203 if (rhs)
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204 {
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205 octave_value rhs_val = rhs->rvalue1 ();
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206
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207 if (! error_state)
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208 {
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209 if (rhs_val.is_undefined ())
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210 {
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211 error ("value on right hand side of assignment is undefined");
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212 return retval;
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213 }
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214 else
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215 {
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216 if (rhs_val.is_cs_list ())
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217 {
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218 const octave_value_list lst = rhs_val.list_value ();
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219
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220 if (! lst.empty ())
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221 rhs_val = lst(0);
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222 else
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223 {
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224 error ("invalid number of elements on RHS of assignment");
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225 return retval;
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226 }
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227 }
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228
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229 octave_lvalue ult = lhs->lvalue ();
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230
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231 if (ult.numel () != 1)
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232 gripe_nonbraced_cs_list_assignment ();
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233
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234 if (! error_state)
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235 {
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236 ult.assign (etype, rhs_val);
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237
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238 if (! error_state)
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239 {
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240 if (etype == octave_value::op_asn_eq)
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241 retval = rhs_val;
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242 else
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243 retval = ult.value ();
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244
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245 if (print_result ())
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246 {
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247 // We clear any index here so that we can
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248 // get the new value of the referenced
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249 // object below, instead of the indexed
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250 // value (which should be the same as the
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251 // right hand side value).
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252
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253 ult.clear_index ();
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254
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255 octave_value lhs_val = ult.value ();
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256
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257 if (! error_state)
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258 lhs_val.print_with_name (octave_stdout,
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259 lhs->name ());
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260 }
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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 first_execution = false;
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268
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269 return retval;
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270 }
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271
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272 std::string
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273 tree_simple_assignment::oper (void) const
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274 {
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275 return octave_value::assign_op_as_string (etype);
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276 }
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277
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278 tree_expression *
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279 tree_simple_assignment::dup (symbol_table::scope_id scope,
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280 symbol_table::context_id context) const
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281 {
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282 tree_simple_assignment *new_sa
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283 = new tree_simple_assignment (lhs ? lhs->dup (scope, context) : 0,
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284 rhs ? rhs->dup (scope, context) : 0,
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285 preserve, etype);
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286
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287 new_sa->copy_base (*this);
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288
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289 return new_sa;
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290 }
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291
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292 void
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293 tree_simple_assignment::accept (tree_walker& tw)
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294 {
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295 tw.visit_simple_assignment (*this);
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296 }
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297
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298 // Multi-valued assignment expressions.
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299
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300 tree_multi_assignment::tree_multi_assignment
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301 (tree_argument_list *lst, tree_expression *r,
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302 bool plhs, int l, int c)
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303 : tree_expression (l, c), lhs (lst), rhs (r), preserve (plhs),
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304 first_execution (true) { }
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305
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306 tree_multi_assignment::~tree_multi_assignment (void)
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307 {
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308 if (! preserve)
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309 delete lhs;
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310
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311 delete rhs;
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312 }
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313
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314 octave_value
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315 tree_multi_assignment::rvalue1 (int nargout)
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316 {
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317 octave_value retval;
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318
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diff changeset
319 const octave_value_list tmp = rvalue (nargout);
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320
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321 if (! tmp.empty ())
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322 retval = tmp(0);
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323
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324 return retval;
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325 }
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326
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327 // FIXME -- this works, but it would look a little better if
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328 // it were broken up into a couple of separate functions.
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329
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330 octave_value_list
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331 tree_multi_assignment::rvalue (int)
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332 {
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333 octave_value_list retval;
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334
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335 if (error_state)
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336 return retval;
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337
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338 if (first_execution)
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339 {
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340 for (tree_argument_list::iterator p = lhs->begin (); p != lhs->end (); p++)
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341 {
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342 tree_expression *lhs_expr = *p;
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343
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344 if (lhs_expr)
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345 maybe_warn_former_built_in_variable (lhs_expr->name ());
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346 }
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347 }
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348
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349 if (rhs)
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350 {
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351 std::list<octave_lvalue> lvalue_list = lhs->lvalue_list ();
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352
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353 if (error_state)
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354 return retval;
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355
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diff changeset
356 octave_idx_type n_out = 0;
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diff changeset
357
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358 for (std::list<octave_lvalue>::const_iterator p = lvalue_list.begin ();
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359 p != lvalue_list.end ();
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diff changeset
360 p++)
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diff changeset
361 n_out += p->numel ();
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362
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363 // The following trick is used to keep rhs_val constant.
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diff changeset
364 const octave_value_list rhs_val1 = rhs->rvalue (n_out, &lvalue_list);
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diff changeset
365 const octave_value_list rhs_val = (rhs_val1.length () == 1 && rhs_val1(0).is_cs_list ()
188d38a553c7 further indexing optimization touches
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diff changeset
366 ? rhs_val1(0).list_value () : rhs_val1);
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367
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368 if (error_state)
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diff changeset
369 return retval;
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diff changeset
370
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diff changeset
371 octave_idx_type k = 0;
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diff changeset
372
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diff changeset
373 octave_idx_type n = rhs_val.length ();
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374
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diff changeset
375 // To avoid copying per elements and possible optimizations, we
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diff changeset
376 // postpone joining the final values.
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diff changeset
377 std::list<octave_value_list> retval_list;
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378
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diff changeset
379 tree_argument_list::iterator q = lhs->begin ();
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diff changeset
380
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diff changeset
381 for (std::list<octave_lvalue>::iterator p = lvalue_list.begin ();
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diff changeset
382 p != lvalue_list.end ();
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383 p++)
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diff changeset
384 {
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diff changeset
385 tree_expression *lhs_elt = *q++;
5846
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diff changeset
386
9782
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diff changeset
387 octave_lvalue ult = *p;
5846
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diff changeset
388
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diff changeset
389 octave_idx_type nel = ult.numel ();
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diff changeset
390
9782
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diff changeset
391 if (nel != 1)
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diff changeset
392 {
eead00a7df05 don't skip empty multi-assignments to allow side effects
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diff changeset
393 if (k + nel <= n)
eead00a7df05 don't skip empty multi-assignments to allow side effects
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diff changeset
394 {
10230
0a5a769b8fc0 disallow computed multiple assignment
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diff changeset
395 // This won't do a copy.
0a5a769b8fc0 disallow computed multiple assignment
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diff changeset
396 octave_value_list ovl = rhs_val.slice (k, nel);
5846
db0598f94c0f [project @ 2006-06-07 18:16:16 by jwe]
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diff changeset
397
10230
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diff changeset
398 ult.assign (octave_value::op_asn_eq, octave_value (ovl, true));
2980
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diff changeset
399
10230
0a5a769b8fc0 disallow computed multiple assignment
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diff changeset
400 if (! error_state)
0a5a769b8fc0 disallow computed multiple assignment
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parents: 10227
diff changeset
401 {
0a5a769b8fc0 disallow computed multiple assignment
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parents: 10227
diff changeset
402 retval_list.push_back (ovl);
5846
db0598f94c0f [project @ 2006-06-07 18:16:16 by jwe]
jwe
parents: 5841
diff changeset
403
10230
0a5a769b8fc0 disallow computed multiple assignment
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parents: 10227
diff changeset
404 k += nel;
9782
eead00a7df05 don't skip empty multi-assignments to allow side effects
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diff changeset
405 }
eead00a7df05 don't skip empty multi-assignments to allow side effects
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diff changeset
406 }
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diff changeset
407 else
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diff changeset
408 error ("some elements undefined in return list");
eead00a7df05 don't skip empty multi-assignments to allow side effects
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diff changeset
409 }
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parents: 9421
diff changeset
410 else
eead00a7df05 don't skip empty multi-assignments to allow side effects
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parents: 9421
diff changeset
411 {
eead00a7df05 don't skip empty multi-assignments to allow side effects
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parents: 9421
diff changeset
412 if (k < n)
eead00a7df05 don't skip empty multi-assignments to allow side effects
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parents: 9421
diff changeset
413 {
10230
0a5a769b8fc0 disallow computed multiple assignment
Jaroslav Hajek <highegg@gmail.com>
parents: 10227
diff changeset
414 ult.assign (octave_value::op_asn_eq, rhs_val(k));
3977
95663a3a2682 [project @ 2002-07-05 17:43:37 by jwe]
jwe
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diff changeset
415
10227
d3fc22c3071c omit ~ values from multi-assignment return lists
Jaroslav Hajek <highegg@gmail.com>
parents: 10160
diff changeset
416 if (ult.is_black_hole ())
d3fc22c3071c omit ~ values from multi-assignment return lists
Jaroslav Hajek <highegg@gmail.com>
parents: 10160
diff changeset
417 {
d3fc22c3071c omit ~ values from multi-assignment return lists
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parents: 10160
diff changeset
418 k++;
d3fc22c3071c omit ~ values from multi-assignment return lists
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parents: 10160
diff changeset
419 continue;
d3fc22c3071c omit ~ values from multi-assignment return lists
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parents: 10160
diff changeset
420 }
d3fc22c3071c omit ~ values from multi-assignment return lists
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diff changeset
421 else if (! error_state)
9782
eead00a7df05 don't skip empty multi-assignments to allow side effects
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parents: 9421
diff changeset
422 {
10230
0a5a769b8fc0 disallow computed multiple assignment
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parents: 10227
diff changeset
423 retval_list.push_back (rhs_val(k));
5846
db0598f94c0f [project @ 2006-06-07 18:16:16 by jwe]
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diff changeset
424
9782
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diff changeset
425 k++;
eead00a7df05 don't skip empty multi-assignments to allow side effects
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diff changeset
426 }
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parents: 9421
diff changeset
427 }
eead00a7df05 don't skip empty multi-assignments to allow side effects
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parents: 9421
diff changeset
428 else
eead00a7df05 don't skip empty multi-assignments to allow side effects
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diff changeset
429 error ("element number %d undefined in return list", k+1);
eead00a7df05 don't skip empty multi-assignments to allow side effects
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parents: 9421
diff changeset
430 }
2980
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diff changeset
431
9782
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diff changeset
432 if (error_state)
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diff changeset
433 break;
eead00a7df05 don't skip empty multi-assignments to allow side effects
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diff changeset
434 else if (print_result ())
eead00a7df05 don't skip empty multi-assignments to allow side effects
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parents: 9421
diff changeset
435 {
eead00a7df05 don't skip empty multi-assignments to allow side effects
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parents: 9421
diff changeset
436 // We clear any index here so that we can get
eead00a7df05 don't skip empty multi-assignments to allow side effects
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parents: 9421
diff changeset
437 // the new value of the referenced object below,
eead00a7df05 don't skip empty multi-assignments to allow side effects
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parents: 9421
diff changeset
438 // instead of the indexed value (which should be
eead00a7df05 don't skip empty multi-assignments to allow side effects
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parents: 9421
diff changeset
439 // the same as the right hand side value).
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diff changeset
440
9782
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diff changeset
441 ult.clear_index ();
3208
e8a7163701be [project @ 1998-11-03 05:12:47 by jwe]
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diff changeset
442
9782
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diff changeset
443 octave_value lhs_val = ult.value ();
3977
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diff changeset
444
9782
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diff changeset
445 if (! error_state)
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diff changeset
446 lhs_val.print_with_name (octave_stdout,
eead00a7df05 don't skip empty multi-assignments to allow side effects
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diff changeset
447 lhs_elt->name ());
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diff changeset
448 }
3977
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diff changeset
449
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diff changeset
450 if (error_state)
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diff changeset
451 break;
3977
95663a3a2682 [project @ 2002-07-05 17:43:37 by jwe]
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diff changeset
452
9782
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diff changeset
453 }
eead00a7df05 don't skip empty multi-assignments to allow side effects
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diff changeset
454
eead00a7df05 don't skip empty multi-assignments to allow side effects
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diff changeset
455 // Concatenate return values.
eead00a7df05 don't skip empty multi-assignments to allow side effects
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parents: 9421
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456 retval = retval_list;
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parents: 9421
diff changeset
457
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458 }
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459
8037
0be8cf23b95c check for obsolete built-in variable assignment at first execution rather than parse time
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parents: 8011
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460 first_execution = false;
0be8cf23b95c check for obsolete built-in variable assignment at first execution rather than parse time
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parents: 8011
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461
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462 return retval;
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463 }
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464
3536
e8fbc8c3d6d9 [project @ 2000-02-02 12:01:00 by jwe]
jwe
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diff changeset
465 std::string
3208
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jwe
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466 tree_multi_assignment::oper (void) const
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jwe
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467 {
10230
0a5a769b8fc0 disallow computed multiple assignment
Jaroslav Hajek <highegg@gmail.com>
parents: 10227
diff changeset
468 return octave_value::assign_op_as_string (op_type ());
3208
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jwe
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469 }
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jwe
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470
5861
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jwe
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diff changeset
471 tree_expression *
7767
71f068b22fcc scope and context fixes for function handles
John W. Eaton <jwe@octave.org>
parents: 7389
diff changeset
472 tree_multi_assignment::dup (symbol_table::scope_id scope,
10315
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10230
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473 symbol_table::context_id context) const
5861
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jwe
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474 {
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475 tree_multi_assignment *new_ma
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parents: 7389
diff changeset
476 = new tree_multi_assignment (lhs ? lhs->dup (scope, context) : 0,
10315
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John W. Eaton <jwe@octave.org>
parents: 10230
diff changeset
477 rhs ? rhs->dup (scope, context) : 0,
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10230
diff changeset
478 preserve);
5861
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479
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
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480 new_ma->copy_base (*this);
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
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481
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
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482 return new_ma;
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483 }
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
jwe
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diff changeset
484
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485 void
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
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486 tree_multi_assignment::accept (tree_walker& tw)
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
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487 {
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
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488 tw.visit_multi_assignment (*this);
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
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489 }