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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 2, or (at your option) any |
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10 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, write to the Free |
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19 Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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20 02110-1301, USA. |
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21 |
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22 */ |
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23 |
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24 #ifdef HAVE_CONFIG_H |
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25 #include <config.h> |
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26 #endif |
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27 |
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28 #include "error.h" |
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29 #include "oct-obj.h" |
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30 #include "oct-lvalue.h" |
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31 #include "ov.h" |
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32 #include "pt-bp.h" |
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33 #include "pt-unop.h" |
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34 #include "pt-walk.h" |
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35 |
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36 // Unary expressions. |
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37 |
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38 std::string |
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39 tree_unary_expression::oper (void) const |
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40 { |
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41 return octave_value::unary_op_as_string (etype); |
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42 } |
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43 |
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44 // Prefix expressions. |
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45 |
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46 octave_value_list |
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47 tree_prefix_expression::rvalue (int nargout) |
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48 { |
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49 octave_value_list retval; |
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50 |
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51 if (nargout > 1) |
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52 error ("prefix operator `%s': invalid number of output arguments", |
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53 oper () . c_str ()); |
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54 else |
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55 retval = rvalue (); |
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56 |
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57 return retval; |
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58 } |
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59 |
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60 octave_value |
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61 tree_prefix_expression::rvalue (void) |
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62 { |
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63 octave_value retval; |
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64 |
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65 MAYBE_DO_BREAKPOINT; |
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66 |
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67 if (error_state) |
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68 return retval; |
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69 |
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70 if (op) |
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71 { |
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72 if (etype == octave_value::op_incr || etype == octave_value::op_decr) |
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73 { |
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74 op->rvalue (); |
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75 |
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76 if (! error_state) |
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77 { |
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78 octave_lvalue ref = op->lvalue (); |
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79 |
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80 if (! error_state && ref.is_defined ()) |
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81 { |
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82 ref.do_unary_op (etype); |
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83 |
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84 retval = ref.value (); |
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85 } |
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86 else |
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87 eval_error (); |
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88 } |
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89 else |
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90 eval_error (); |
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91 } |
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92 else |
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93 { |
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94 octave_value val = op->rvalue (); |
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95 |
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96 if (! error_state && val.is_defined ()) |
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97 { |
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98 retval = ::do_unary_op (etype, val); |
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99 |
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100 if (error_state) |
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101 { |
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102 retval = octave_value (); |
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103 eval_error (); |
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104 } |
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105 } |
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106 else |
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107 eval_error (); |
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108 } |
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109 } |
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110 else |
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111 eval_error (); |
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112 |
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113 return retval; |
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114 } |
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115 |
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116 void |
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117 tree_prefix_expression::eval_error (void) |
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118 { |
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119 ::error ("evaluating prefix operator `%s' near line %d, column %d", |
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120 oper () . c_str (), line (), column ()); |
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121 } |
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122 |
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123 tree_expression * |
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124 tree_prefix_expression::dup (symbol_table *sym_tab) |
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125 { |
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126 tree_prefix_expression *new_pe |
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127 = new tree_prefix_expression (op ? op->dup (sym_tab) : 0, |
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128 line (), column (), etype); |
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129 |
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130 new_pe->copy_base (*this); |
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131 |
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132 return new_pe; |
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133 } |
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134 |
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135 void |
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136 tree_prefix_expression::accept (tree_walker& tw) |
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137 { |
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138 tw.visit_prefix_expression (*this); |
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139 } |
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140 |
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141 // Postfix expressions. |
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142 |
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143 octave_value_list |
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144 tree_postfix_expression::rvalue (int nargout) |
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145 { |
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146 octave_value_list retval; |
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147 |
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148 if (nargout > 1) |
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149 error ("postfix operator `%s': invalid number of output arguments", |
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150 oper () . c_str ()); |
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151 else |
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152 retval = rvalue (); |
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153 |
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154 return retval; |
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155 } |
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156 |
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157 octave_value |
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158 tree_postfix_expression::rvalue (void) |
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159 { |
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160 octave_value retval; |
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161 |
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162 MAYBE_DO_BREAKPOINT; |
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163 |
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164 if (error_state) |
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165 return retval; |
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166 |
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167 if (op) |
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168 { |
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169 if (etype == octave_value::op_incr || etype == octave_value::op_decr) |
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170 { |
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171 op->rvalue (); |
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172 |
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173 if (! error_state) |
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174 { |
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175 octave_lvalue ref = op->lvalue (); |
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176 |
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177 if (! error_state && ref.is_defined ()) |
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178 { |
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179 retval = ref.value (); |
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180 |
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181 ref.do_unary_op (etype); |
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182 } |
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183 else |
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184 eval_error (); |
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185 } |
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186 else |
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187 eval_error (); |
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188 } |
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189 else |
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190 { |
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191 octave_value val = op->rvalue (); |
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192 |
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193 if (! error_state && val.is_defined ()) |
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194 { |
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195 retval = ::do_unary_op (etype, val); |
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196 |
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197 if (error_state) |
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198 { |
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199 retval = octave_value (); |
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200 eval_error (); |
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201 } |
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202 } |
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203 else |
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204 eval_error (); |
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205 } |
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206 } |
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207 else |
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208 eval_error (); |
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209 |
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210 return retval; |
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211 } |
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212 |
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213 void |
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214 tree_postfix_expression::eval_error (void) |
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215 { |
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216 ::error ("evaluating postfix operator `%s' near line %d, column %d", |
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217 oper () . c_str (), line (), column ()); |
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218 } |
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219 |
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220 tree_expression * |
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221 tree_postfix_expression::dup (symbol_table *sym_tab) |
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222 { |
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223 tree_postfix_expression *new_pe |
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224 = new tree_postfix_expression (op ? op->dup (sym_tab) : 0, |
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225 line (), column (), etype); |
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226 |
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227 new_pe->copy_base (*this); |
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228 |
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229 return new_pe; |
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230 } |
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231 |
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232 void |
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233 tree_postfix_expression::accept (tree_walker& tw) |
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234 { |
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235 tw.visit_postfix_expression (*this); |
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236 } |
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237 |
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238 /* |
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239 ;;; Local Variables: *** |
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240 ;;; mode: C++ *** |
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241 ;;; End: *** |
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242 */ |
