Mercurial > hg > octave-nkf

annotate libinterp/parse-tree/pt-binop.cc @ 16177:a7669b4d27f6

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eliminate global global_command variable * toplev.h, toplev.cc (global_command): Delete. * parse.h, oct-parse.in.yy (octave_parser::stmt_list): New member variable. (octave_parser::octave_parser): Initialize it to zero. (octave_parser:~octave_parser): Delete it. (octave_parser::reset): Delete it and set it to zero. * toplev.cc (main_loop): Use curr_parser->stmt_list instead of global_command. * input.cc (get_debug_input): Likewise. * oct-parse.in.yy (eval_string, parse_fcn_file): Likewise. (ABORT_PARSE): Don't set global_command to zero. (input): Set curr_parser->stmt_list instead of global_command.
author John W. Eaton <jwe@octave.org>
date Sat, 02 Mar 2013 19:31:26 -0500
parents 049e8bbff782
children bc924baa2c4e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /*
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2
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72c96de7a403 maint: update copyright notices for 2012
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3 Copyright (C) 1996-2012 John W. Eaton
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4
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5 This file is part of Octave.
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6
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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
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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
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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 "error.h"
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28 #include "defun.h"
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29 #include "oct-obj.h"
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30 #include "ov.h"
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31 #include "profiler.h"
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32 #include "pt-binop.h"
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33 #include "pt-bp.h"
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34 #include "pt-walk.h"
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35 #include "variables.h"
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36
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37 // TRUE means we mark | and & expressions for braindead short-circuit
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38 // behavior.
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39 static bool Vdo_braindead_shortcircuit_evaluation;
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40
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41 // Binary expressions.
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42
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43 octave_value_list
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44 tree_binary_expression::rvalue (int nargout)
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45 {
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46 octave_value_list retval;
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47
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48 if (nargout > 1)
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49 error ("binary operator '%s': invalid number of output arguments",
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50 oper () . c_str ());
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51 else
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52 retval = rvalue1 (nargout);
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53
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54 return retval;
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55 }
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56
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57 octave_value
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58 tree_binary_expression::rvalue1 (int)
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59 {
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60 octave_value retval;
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61
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62 if (error_state)
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63 return retval;
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64
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65 if (Vdo_braindead_shortcircuit_evaluation
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66 && eligible_for_braindead_shortcircuit)
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67 {
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68 if (op_lhs)
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69 {
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70 octave_value a = op_lhs->rvalue1 ();
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71
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72 if (! error_state)
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73 {
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74 if (a.ndims () == 2 && a.rows () == 1 && a.columns () == 1)
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75 {
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76 bool result = false;
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77
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78 bool a_true = a.is_true ();
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79
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80 if (! error_state)
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81 {
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82 if (a_true)
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83 {
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84 if (etype == octave_value::op_el_or)
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85 {
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86 result = true;
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87 goto done;
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88 }
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89 }
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90 else
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91 {
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92 if (etype == octave_value::op_el_and)
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93 goto done;
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94 }
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95
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96 if (op_rhs)
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97 {
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98 octave_value b = op_rhs->rvalue1 ();
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99
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100 if (! error_state)
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101 result = b.is_true ();
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102 }
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103
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104 done:
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105
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106 if (! error_state)
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107 return octave_value (result);
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108 }
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109 }
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110 }
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111 }
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112 }
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113
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114 if (op_lhs)
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115 {
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116 octave_value a = op_lhs->rvalue1 ();
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117
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118 if (! error_state && a.is_defined () && op_rhs)
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119 {
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120 octave_value b = op_rhs->rvalue1 ();
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121
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122 if (! error_state && b.is_defined ())
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123 {
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124 BEGIN_PROFILER_BLOCK ("binary " + oper ())
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125
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126 // Note: The profiler does not catch the braindead
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127 // short-circuit evaluation code above, but that should be
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128 // ok. The evaluation of operands and the operator itself
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129 // is entangled and it's not clear where to start/stop
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130 // timing the operator to make it reasonable.
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131
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132 retval = ::do_binary_op (etype, a, b);
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133
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134 if (error_state)
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135 retval = octave_value ();
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136
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137 END_PROFILER_BLOCK
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138 }
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139 }
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140 }
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141
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142 return retval;
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143 }
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144
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145 std::string
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diff changeset
146 tree_binary_expression::oper (void) const
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
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diff changeset
147 {
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
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diff changeset
148 return octave_value::binary_op_as_string (etype);
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
149 }
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
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diff changeset
150
5861
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diff changeset
151 tree_expression *
7767
71f068b22fcc scope and context fixes for function handles
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parents: 7336
diff changeset
152 tree_binary_expression::dup (symbol_table::scope_id scope,
10315
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parents: 10160
diff changeset
153 symbol_table::context_id context) const
5861
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jwe
parents: 5307
diff changeset
154 {
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
jwe
parents: 5307
diff changeset
155 tree_binary_expression *new_be
7767
71f068b22fcc scope and context fixes for function handles
John W. Eaton <jwe@octave.org>
parents: 7336
diff changeset
156 = new tree_binary_expression (op_lhs ? op_lhs->dup (scope, context) : 0,
10315
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John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
157 op_rhs ? op_rhs->dup (scope, context) : 0,
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
158 line (), column (), etype);
5861
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
jwe
parents: 5307
diff changeset
159
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
jwe
parents: 5307
diff changeset
160 new_be->copy_base (*this);
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
jwe
parents: 5307
diff changeset
161
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
jwe
parents: 5307
diff changeset
162 return new_be;
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
jwe
parents: 5307
diff changeset
163 }
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
jwe
parents: 5307
diff changeset
164
2980
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diff changeset
165 void
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
166 tree_binary_expression::accept (tree_walker& tw)
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
167 {
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
168 tw.visit_binary_expression (*this);
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
169 }
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
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170
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
171 // Boolean expressions.
11586
12df7854fa7c strip trailing whitespace from source files
John W. Eaton <jwe@octave.org>
parents: 11572
diff changeset
172
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diff changeset
173 octave_value_list
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
174 tree_boolean_expression::rvalue (int nargout)
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
175 {
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
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diff changeset
176 octave_value_list retval;
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
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diff changeset
177
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
178 if (nargout > 1)
15466
d174210ce1ec use ' instead of ` in error messages, warnings and most comments
John W. Eaton <jwe@octave.org>
parents: 14138
diff changeset
179 error ("binary operator '%s': invalid number of output arguments",
10315
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
180 oper () . c_str ());
2980
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
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181 else
8658
73c4516fae10 New evaluator and debugger derived from tree-walker class
John W. Eaton <jwe@octave.org>
parents: 8011
diff changeset
182 retval = rvalue1 (nargout);
2980
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diff changeset
183
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
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diff changeset
184 return retval;
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
185 }
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
186
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
187 octave_value
8658
73c4516fae10 New evaluator and debugger derived from tree-walker class
John W. Eaton <jwe@octave.org>
parents: 8011
diff changeset
188 tree_boolean_expression::rvalue1 (int)
2980
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
189 {
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
190 octave_value retval;
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
191
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
192 if (error_state)
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
193 return retval;
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
194
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
195 bool result = false;
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
196
12921
7820a12baadd Style fixes on comments about profiling operators
Jordi Gutiérrez Hermoso <jordigh@gmail.com>
parents: 12920
diff changeset
197 // This evaluation is not caught by the profiler, since we can't find
7820a12baadd Style fixes on comments about profiling operators
Jordi Gutiérrez Hermoso <jordigh@gmail.com>
parents: 12920
diff changeset
198 // a reasonable place where to time. Note that we don't want to
7820a12baadd Style fixes on comments about profiling operators
Jordi Gutiérrez Hermoso <jordigh@gmail.com>
parents: 12920
diff changeset
199 // include evaluation of LHS or RHS into the timing, but this is
7820a12baadd Style fixes on comments about profiling operators
Jordi Gutiérrez Hermoso <jordigh@gmail.com>
parents: 12920
diff changeset
200 // entangled together with short-circuit evaluation here.
12920
5d18231eee00 Extend profiling support to operators.
Daniel Kraft <d@domob.eu>
parents: 12822
diff changeset
201
2980
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
202 if (op_lhs)
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
203 {
8658
73c4516fae10 New evaluator and debugger derived from tree-walker class
John W. Eaton <jwe@octave.org>
parents: 8011
diff changeset
204 octave_value a = op_lhs->rvalue1 ();
2980
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
205
8011
3100283874d7 improve backtrace error messages
John W. Eaton <jwe@octave.org>
parents: 7767
diff changeset
206 if (! error_state)
10315
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
207 {
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
208 bool a_true = a.is_true ();
2980
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
209
10315
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
210 if (! error_state)
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
211 {
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
212 if (a_true)
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
213 {
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
214 if (etype == bool_or)
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
215 {
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
216 result = true;
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
217 goto done;
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
218 }
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
219 }
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
220 else
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
221 {
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
222 if (etype == bool_and)
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
223 goto done;
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
224 }
2980
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
225
10315
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
226 if (op_rhs)
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
227 {
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
228 octave_value b = op_rhs->rvalue1 ();
2980
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
229
10315
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
230 if (! error_state)
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
231 result = b.is_true ();
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
232 }
2980
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
233
10315
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
234 done:
2980
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
235
10315
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
236 if (! error_state)
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
237 retval = octave_value (result);
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
238 }
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
239 }
2980
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
240 }
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
241
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
242 return retval;
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
243 }
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
244
3536
e8fbc8c3d6d9 [project @ 2000-02-02 12:01:00 by jwe]
jwe
parents: 3534
diff changeset
245 std::string
2980
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jwe
parents:
diff changeset
246 tree_boolean_expression::oper (void) const
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
247 {
3523
b80bbb43a1a9 [project @ 2000-02-02 10:25:52 by jwe]
jwe
parents: 2982
diff changeset
248 std::string retval = "<unknown>";
2980
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
249
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
250 switch (etype)
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
251 {
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
252 case bool_and:
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
253 retval = "&&";
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
254 break;
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
255
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
256 case bool_or:
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
257 retval = "||";
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
258 break;
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
259
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
260 default:
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
261 break;
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
262 }
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
263
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
264 return retval;
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
265 }
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
266
5861
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
jwe
parents: 5307
diff changeset
267 tree_expression *
7767
71f068b22fcc scope and context fixes for function handles
John W. Eaton <jwe@octave.org>
parents: 7336
diff changeset
268 tree_boolean_expression::dup (symbol_table::scope_id scope,
10315
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
269 symbol_table::context_id context) const
5861
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
jwe
parents: 5307
diff changeset
270 {
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
jwe
parents: 5307
diff changeset
271 tree_boolean_expression *new_be
7767
71f068b22fcc scope and context fixes for function handles
John W. Eaton <jwe@octave.org>
parents: 7336
diff changeset
272 = new tree_boolean_expression (op_lhs ? op_lhs->dup (scope, context) : 0,
10315
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
273 op_rhs ? op_rhs->dup (scope, context) : 0,
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
274 line (), column (), etype);
5861
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
jwe
parents: 5307
diff changeset
275
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
jwe
parents: 5307
diff changeset
276 new_be->copy_base (*this);
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
jwe
parents: 5307
diff changeset
277
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
jwe
parents: 5307
diff changeset
278 return new_be;
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
jwe
parents: 5307
diff changeset
279 }
11091
5677f3f7b5fa Matlab compatible short-circuit behavior for & and | operators
John W. Eaton <jwe@octave.org>
parents: 10315
diff changeset
280
5677f3f7b5fa Matlab compatible short-circuit behavior for & and | operators
John W. Eaton <jwe@octave.org>
parents: 10315
diff changeset
281 DEFUN (do_braindead_shortcircuit_evaluation, args, nargout,
5677f3f7b5fa Matlab compatible short-circuit behavior for & and | operators
John W. Eaton <jwe@octave.org>
parents: 10315
diff changeset
282 "-*- texinfo -*-\n\
5677f3f7b5fa Matlab compatible short-circuit behavior for & and | operators
John W. Eaton <jwe@octave.org>
parents: 10315
diff changeset
283 @deftypefn {Built-in Function} {@var{val} =} do_braindead_shortcircuit_evaluation ()\n\
11572
7d6d8c1e471f Grammarcheck Texinfo for files in src directory.
Rik <octave@nomad.inbox5.com>
parents: 11523
diff changeset
284 @deftypefnx {Built-in Function} {@var{old_val} =} do_braindead_shortcircuit_evaluation (@var{new_val})\n\
13951
79aa00a94e9e doc: Document "local" option for configuration variables.
Rik <octave@nomad.inbox5.com>
parents: 13141
diff changeset
285 @deftypefnx {Built-in Function} {} do_braindead_shortcircuit_evaluation (@var{new_val}, \"local\")\n\
11091
5677f3f7b5fa Matlab compatible short-circuit behavior for & and | operators
John W. Eaton <jwe@octave.org>
parents: 10315
diff changeset
286 Query or set the internal variable that controls whether Octave will\n\
5677f3f7b5fa Matlab compatible short-circuit behavior for & and | operators
John W. Eaton <jwe@octave.org>
parents: 10315
diff changeset
287 do short-circuit evaluation of @samp{|} and @samp{&} operators inside the\n\
5677f3f7b5fa Matlab compatible short-circuit behavior for & and | operators
John W. Eaton <jwe@octave.org>
parents: 10315
diff changeset
288 conditions of if or while statements.\n\
5677f3f7b5fa Matlab compatible short-circuit behavior for & and | operators
John W. Eaton <jwe@octave.org>
parents: 10315
diff changeset
289 \n\
11572
7d6d8c1e471f Grammarcheck Texinfo for files in src directory.
Rik <octave@nomad.inbox5.com>
parents: 11523
diff changeset
290 This feature is only provided for compatibility with @sc{matlab} and should\n\
11091
5677f3f7b5fa Matlab compatible short-circuit behavior for & and | operators
John W. Eaton <jwe@octave.org>
parents: 10315
diff changeset
291 not be used unless you are porting old code that relies on this feature.\n\
5677f3f7b5fa Matlab compatible short-circuit behavior for & and | operators
John W. Eaton <jwe@octave.org>
parents: 10315
diff changeset
292 \n\
5677f3f7b5fa Matlab compatible short-circuit behavior for & and | operators
John W. Eaton <jwe@octave.org>
parents: 10315
diff changeset
293 To obtain short-circuit behavior for logical expressions in new programs,\n\
5677f3f7b5fa Matlab compatible short-circuit behavior for & and | operators
John W. Eaton <jwe@octave.org>
parents: 10315
diff changeset
294 you should always use the @samp{&&} and @samp{||} operators.\n\
13951
79aa00a94e9e doc: Document "local" option for configuration variables.
Rik <octave@nomad.inbox5.com>
parents: 13141
diff changeset
295 \n\
79aa00a94e9e doc: Document "local" option for configuration variables.
Rik <octave@nomad.inbox5.com>
parents: 13141
diff changeset
296 When called from inside a function with the \"local\" option, the variable is\n\
79aa00a94e9e doc: Document "local" option for configuration variables.
Rik <octave@nomad.inbox5.com>
parents: 13141
diff changeset
297 changed locally for the function and any subroutines it calls. The original\n\
79aa00a94e9e doc: Document "local" option for configuration variables.
Rik <octave@nomad.inbox5.com>
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298 variable value is restored when exiting the function.\n\
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299 @end deftypefn")
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300 {
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301 return SET_INTERNAL_VARIABLE (do_braindead_shortcircuit_evaluation);
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302 }
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303
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304 /*
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305 %!test
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306 %! x = 0;
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307 %! do_braindead_shortcircuit_evaluation (0);
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308 %! if (1 | (x = 1))
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309 %! endif
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310 %! assert (x, 1);
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311 %! do_braindead_shortcircuit_evaluation (1);
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312 %! if (1 | (x = 0))
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313 %! endif
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314 %! assert (x, 1);
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315 */