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