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annotate src/pt-unop.cc @ 11523:fd0a3ac60b0e

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update copyright notices
author John W. Eaton <jwe@octave.org>
date Fri, 14 Jan 2011 05:47:45 -0500
parents d1194069e58c
children 12df7854fa7c
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1 /*
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2
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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
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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 "oct-obj.h"
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29 #include "oct-lvalue.h"
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30 #include "ov.h"
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31 #include "pt-bp.h"
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32 #include "pt-unop.h"
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33 #include "pt-walk.h"
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34
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35 // Unary expressions.
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36
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37 std::string
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38 tree_unary_expression::oper (void) const
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39 {
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40 return octave_value::unary_op_as_string (etype);
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41 }
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42
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43 // Prefix expressions.
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44
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45 octave_value_list
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46 tree_prefix_expression::rvalue (int nargout)
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47 {
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48 octave_value_list retval;
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49
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50 if (nargout > 1)
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51 error ("prefix operator `%s': invalid number of output arguments",
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52 oper () . c_str ());
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53 else
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54 retval = rvalue1 (nargout);
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55
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56 return retval;
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57 }
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58
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59 octave_value
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60 tree_prefix_expression::rvalue1 (int)
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61 {
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62 octave_value retval;
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63
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64 if (error_state)
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65 return retval;
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66
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67 if (op)
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68 {
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69 if (etype == octave_value::op_incr || etype == octave_value::op_decr)
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70 {
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71 octave_lvalue ref = op->lvalue ();
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72
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73 if (! error_state)
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74 {
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75 ref.do_unary_op (etype);
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76
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77 if (! error_state)
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78 retval = ref.value ();
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79 }
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80 }
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81 else
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82 {
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83 octave_value val = op->rvalue1 ();
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84
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85 if (! error_state && val.is_defined ())
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86 {
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87 // Attempt to do the operation in-place if it is unshared
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88 // (a temporary expression).
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89 if (val.get_count () == 1)
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90 retval = val.do_non_const_unary_op (etype);
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91 else
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92 retval = ::do_unary_op (etype, val);
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93
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94 if (error_state)
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95 retval = octave_value ();
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96 }
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97 }
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98 }
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99
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100 return retval;
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101 }
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102
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103 tree_expression *
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104 tree_prefix_expression::dup (symbol_table::scope_id scope,
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105 symbol_table::context_id context) const
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106 {
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107 tree_prefix_expression *new_pe
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108 = new tree_prefix_expression (op ? op->dup (scope, context) : 0,
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109 line (), column (), etype);
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110
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111 new_pe->copy_base (*this);
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112
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113 return new_pe;
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114 }
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115
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116 void
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117 tree_prefix_expression::accept (tree_walker& tw)
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118 {
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119 tw.visit_prefix_expression (*this);
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120 }
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121
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122 // Postfix expressions.
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123
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124 octave_value_list
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125 tree_postfix_expression::rvalue (int nargout)
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126 {
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127 octave_value_list retval;
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128
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129 if (nargout > 1)
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130 error ("postfix operator `%s': invalid number of output arguments",
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131 oper () . c_str ());
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132 else
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133 retval = rvalue1 (nargout);
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134
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135 return retval;
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136 }
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137
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138 octave_value
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139 tree_postfix_expression::rvalue1 (int)
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140 {
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141 octave_value retval;
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142
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143 if (error_state)
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144 return retval;
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145
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146 if (op)
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147 {
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148 if (etype == octave_value::op_incr || etype == octave_value::op_decr)
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149 {
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150 octave_lvalue ref = op->lvalue ();
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151
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152 if (! error_state)
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153 {
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154 retval = ref.value ();
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155
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156 ref.do_unary_op (etype);
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157 }
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158 }
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159 else
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160 {
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161 octave_value val = op->rvalue1 ();
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162
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163 if (! error_state && val.is_defined ())
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164 {
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165 retval = ::do_unary_op (etype, val);
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166
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167 if (error_state)
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168 retval = octave_value ();
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169 }
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170 }
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171 }
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172
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173 return retval;
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174 }
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175
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176 tree_expression *
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177 tree_postfix_expression::dup (symbol_table::scope_id scope,
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178 symbol_table::context_id context) const
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179 {
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180 tree_postfix_expression *new_pe
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181 = new tree_postfix_expression (op ? op->dup (scope, context) : 0,
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182 line (), column (), etype);
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183
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184 new_pe->copy_base (*this);
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185
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186 return new_pe;
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187 }
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188
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189 void
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190 tree_postfix_expression::accept (tree_walker& tw)
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191 {
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192 tw.visit_postfix_expression (*this);
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193 }