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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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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23 #if defined (__GNUG__) |
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24 #pragma implementation |
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25 #endif |
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26 |
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27 #ifdef HAVE_CONFIG_H |
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28 #include <config.h> |
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29 #endif |
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30 |
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31 #include "error.h" |
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32 #include "oct-obj.h" |
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33 #include "oct-lvalue.h" |
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34 #include "ov.h" |
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35 #include "pt-unop.h" |
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36 #include "pt-pr-code.h" |
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37 #include "pt-walk.h" |
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38 |
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39 // Prefix expressions. |
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40 |
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41 octave_value_list |
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42 tree_prefix_expression::rvalue (int nargout) |
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43 { |
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44 octave_value_list retval; |
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45 |
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46 if (nargout > 1) |
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47 error ("prefix operator `%s': invalid number of output arguments", |
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48 oper () . c_str ()); |
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49 else |
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50 retval = rvalue (); |
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51 |
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52 return retval; |
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53 } |
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54 |
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55 octave_value |
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56 tree_prefix_expression::rvalue (void) |
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57 { |
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58 octave_value retval; |
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59 |
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60 if (error_state) |
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61 return retval; |
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62 |
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63 if (op) |
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64 { |
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65 if (etype == unot || etype == uminus) |
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66 { |
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67 octave_value val = op->rvalue (); |
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68 |
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69 if (! error_state) |
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70 { |
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71 if (val.is_defined ()) |
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72 { |
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73 if (etype == unot) |
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74 retval = val.not (); |
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75 else |
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76 retval = val.uminus (); |
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77 } |
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78 else |
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79 error ("argument to prefix operator `%s' undefined", |
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80 oper () . c_str ()); |
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81 } |
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82 } |
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83 else if (etype == increment || etype == decrement) |
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84 { |
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85 octave_lvalue ref = op->lvalue (); |
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86 |
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87 if (! error_state) |
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88 { |
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89 if (ref.is_defined ()) |
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90 { |
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91 if (etype == increment) |
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92 ref.increment (); |
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93 else |
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94 ref.decrement (); |
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95 |
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96 retval = ref.value (); |
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97 } |
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98 else |
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99 error ("argument to prefix operator `%s' undefined", |
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100 oper () . c_str ()); |
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101 } |
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102 } |
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103 else |
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104 error ("prefix operator %d not implemented", etype); |
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105 } |
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106 |
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107 return retval; |
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108 } |
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109 |
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110 void |
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111 tree_prefix_expression::eval_error (void) |
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112 { |
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113 if (error_state > 0) |
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114 ::error ("evaluating prefix operator `%s' near line %d, column %d", |
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115 oper () . c_str (), line (), column ()); |
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116 } |
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117 |
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118 string |
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119 tree_prefix_expression::oper (void) const |
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120 { |
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121 string retval = "<unknown>"; |
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122 |
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123 switch (etype) |
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124 { |
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125 case unot: |
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126 retval = "!"; |
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127 break; |
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128 |
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129 case uminus: |
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130 retval = "-"; |
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131 break; |
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132 |
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133 case increment: |
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134 retval = "++"; |
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135 break; |
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136 |
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137 case decrement: |
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138 retval = "--"; |
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139 break; |
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140 |
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141 default: |
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142 break; |
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143 } |
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144 |
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145 return retval; |
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146 } |
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147 |
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148 void |
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149 tree_prefix_expression::accept (tree_walker& tw) |
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150 { |
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151 tw.visit_prefix_expression (*this); |
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152 } |
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153 |
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154 // Postfix expressions. |
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155 |
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156 octave_value_list |
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157 tree_postfix_expression::rvalue (int nargout) |
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158 { |
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159 octave_value_list retval; |
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160 |
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161 if (nargout > 1) |
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162 error ("postfix operator `%s': invalid number of output arguments", |
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163 oper () . c_str ()); |
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164 else |
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165 retval = rvalue (); |
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166 |
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167 return retval; |
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168 } |
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169 |
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170 octave_value |
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171 tree_postfix_expression::rvalue (void) |
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172 { |
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173 octave_value retval; |
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174 |
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175 if (error_state) |
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176 return retval; |
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177 |
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178 if (op) |
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179 { |
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180 if (etype == transpose || etype == hermitian) |
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181 { |
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182 octave_value val = op->rvalue (); |
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183 |
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184 if (! error_state) |
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185 { |
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186 if (val.is_defined ()) |
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187 { |
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188 if (etype == transpose) |
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189 retval = val.transpose (); |
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190 else |
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191 retval = val.hermitian (); |
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192 } |
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193 else |
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194 error ("argument to postfix operator `%s' undefined", |
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195 oper () . c_str ()); |
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196 } |
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197 } |
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198 else if (etype == increment || etype == decrement) |
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199 { |
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200 octave_lvalue ref = op->lvalue (); |
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201 |
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202 if (! error_state) |
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203 { |
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204 if (ref.is_defined ()) |
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205 { |
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206 retval = ref.value (); |
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207 |
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208 if (etype == increment) |
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209 ref.increment (); |
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210 else |
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211 ref.decrement (); |
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212 } |
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213 else |
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214 error ("argument to postfix operator `%s' undefined", |
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215 oper () . c_str ()); |
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216 } |
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217 } |
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218 else |
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219 error ("postfix operator %d not implemented", etype); |
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220 } |
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221 |
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222 return retval; |
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223 } |
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224 |
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225 void |
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226 tree_postfix_expression::eval_error (void) |
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227 { |
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228 if (error_state > 0) |
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229 ::error ("evaluating postfix operator `%s' near line %d, column %d", |
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230 oper () . c_str (), line (), column ()); |
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231 } |
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232 |
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233 string |
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234 tree_postfix_expression::oper (void) const |
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235 { |
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236 string retval = "<unknown>"; |
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237 |
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238 switch (etype) |
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239 { |
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240 case transpose: |
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241 retval = ".'"; |
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242 break; |
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243 |
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244 case hermitian: |
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245 retval = "'"; |
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246 break; |
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247 |
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248 case increment: |
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249 retval = "++"; |
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250 break; |
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251 |
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252 case decrement: |
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253 retval = "--"; |
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254 break; |
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255 |
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256 default: |
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257 break; |
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258 } |
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259 |
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260 return retval; |
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261 } |
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262 |
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263 void |
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264 tree_postfix_expression::accept (tree_walker& tw) |
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265 { |
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266 tw.visit_postfix_expression (*this); |
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267 } |
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268 |
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269 /* |
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270 ;;; Local Variables: *** |
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271 ;;; mode: C++ *** |
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272 ;;; End: *** |
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273 */ |
