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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 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 = rvalue (); |
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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::rvalue (void) |
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61 { |
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62 octave_value retval; |
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63 |
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64 MAYBE_DO_BREAKPOINT; |
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65 |
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66 if (error_state) |
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67 return retval; |
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68 |
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69 if (op) |
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70 { |
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71 if (etype == octave_value::op_incr || etype == octave_value::op_decr) |
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72 { |
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73 op->rvalue (); |
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74 |
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75 if (! error_state) |
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76 { |
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77 octave_lvalue ref = op->lvalue (); |
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78 |
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79 if (! error_state && ref.is_defined ()) |
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80 { |
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81 ref.do_unary_op (etype); |
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82 |
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83 retval = ref.value (); |
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84 } |
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85 else |
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86 eval_error (); |
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87 } |
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88 else |
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89 eval_error (); |
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90 } |
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91 else |
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92 { |
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93 octave_value val = op->rvalue (); |
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94 |
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95 if (! error_state && val.is_defined ()) |
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96 { |
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97 retval = ::do_unary_op (etype, val); |
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98 |
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99 if (error_state) |
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100 { |
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101 retval = octave_value (); |
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102 eval_error (); |
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103 } |
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104 } |
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105 else |
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106 eval_error (); |
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107 } |
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108 } |
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109 else |
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110 eval_error (); |
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111 |
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112 return retval; |
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113 } |
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114 |
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115 void |
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116 tree_prefix_expression::eval_error (void) |
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117 { |
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118 ::error ("evaluating prefix operator `%s' near line %d, column %d", |
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119 oper () . c_str (), line (), column ()); |
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120 } |
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121 |
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122 tree_expression * |
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123 tree_prefix_expression::dup (symbol_table *sym_tab) |
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124 { |
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125 tree_prefix_expression *new_pe |
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126 = new tree_prefix_expression (op ? op->dup (sym_tab) : 0, |
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127 line (), column (), etype); |
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128 |
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129 new_pe->copy_base (*this); |
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130 |
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131 return new_pe; |
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132 } |
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133 |
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134 void |
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135 tree_prefix_expression::accept (tree_walker& tw) |
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136 { |
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137 tw.visit_prefix_expression (*this); |
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138 } |
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139 |
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140 // Postfix expressions. |
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141 |
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142 octave_value_list |
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143 tree_postfix_expression::rvalue (int nargout) |
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144 { |
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145 octave_value_list retval; |
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146 |
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147 if (nargout > 1) |
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148 error ("postfix operator `%s': invalid number of output arguments", |
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149 oper () . c_str ()); |
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150 else |
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151 retval = rvalue (); |
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152 |
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153 return retval; |
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154 } |
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155 |
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156 octave_value |
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157 tree_postfix_expression::rvalue (void) |
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158 { |
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159 octave_value retval; |
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160 |
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161 MAYBE_DO_BREAKPOINT; |
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162 |
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163 if (error_state) |
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164 return retval; |
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165 |
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166 if (op) |
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167 { |
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168 if (etype == octave_value::op_incr || etype == octave_value::op_decr) |
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169 { |
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170 op->rvalue (); |
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171 |
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172 if (! error_state) |
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173 { |
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174 octave_lvalue ref = op->lvalue (); |
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175 |
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176 if (! error_state && ref.is_defined ()) |
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177 { |
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178 retval = ref.value (); |
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179 |
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180 ref.do_unary_op (etype); |
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181 } |
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182 else |
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183 eval_error (); |
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184 } |
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185 else |
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186 eval_error (); |
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187 } |
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188 else |
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189 { |
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190 octave_value val = op->rvalue (); |
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191 |
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192 if (! error_state && val.is_defined ()) |
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193 { |
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194 retval = ::do_unary_op (etype, val); |
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195 |
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196 if (error_state) |
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197 { |
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198 retval = octave_value (); |
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199 eval_error (); |
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200 } |
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201 } |
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202 else |
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203 eval_error (); |
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204 } |
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205 } |
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206 else |
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207 eval_error (); |
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208 |
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209 return retval; |
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210 } |
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211 |
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212 void |
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213 tree_postfix_expression::eval_error (void) |
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214 { |
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215 ::error ("evaluating postfix operator `%s' near line %d, column %d", |
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216 oper () . c_str (), line (), column ()); |
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217 } |
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218 |
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219 tree_expression * |
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220 tree_postfix_expression::dup (symbol_table *sym_tab) |
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221 { |
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222 tree_postfix_expression *new_pe |
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223 = new tree_postfix_expression (op ? op->dup (sym_tab) : 0, |
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224 line (), column (), etype); |
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225 |
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226 new_pe->copy_base (*this); |
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227 |
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228 return new_pe; |
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229 } |
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230 |
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231 void |
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232 tree_postfix_expression::accept (tree_walker& tw) |
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233 { |
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234 tw.visit_postfix_expression (*this); |
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235 } |
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236 |
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237 /* |
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238 ;;; Local Variables: *** |
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239 ;;; mode: C++ *** |
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240 ;;; End: *** |
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241 */ |
