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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-bp.h" |
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36 #include "pt-unop.h" |
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37 #include "pt-walk.h" |
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38 |
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39 // Unary expressions. |
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40 |
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41 std::string |
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42 tree_unary_expression::oper (void) const |
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43 { |
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44 return octave_value::unary_op_as_string (etype); |
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45 } |
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46 |
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47 // Prefix expressions. |
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48 |
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49 octave_value_list |
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50 tree_prefix_expression::rvalue (int nargout) |
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51 { |
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52 octave_value_list retval; |
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53 |
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54 if (nargout > 1) |
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55 error ("prefix operator `%s': invalid number of output arguments", |
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56 oper () . c_str ()); |
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57 else |
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58 retval = rvalue (); |
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59 |
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60 return retval; |
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61 } |
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62 |
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63 octave_value |
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64 tree_prefix_expression::rvalue (void) |
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65 { |
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66 octave_value retval; |
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67 |
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68 MAYBE_DO_BREAKPOINT; |
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69 |
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70 if (error_state) |
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71 return retval; |
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72 |
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73 if (op) |
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74 { |
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75 if (etype == octave_value::op_incr || etype == octave_value::op_decr) |
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76 { |
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77 op->rvalue (); |
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78 |
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79 if (! error_state) |
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80 { |
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81 octave_lvalue ref = op->lvalue (); |
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82 |
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83 if (! error_state && ref.is_defined ()) |
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84 { |
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85 ref.do_unary_op (etype); |
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86 |
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87 retval = ref.value (); |
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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 eval_error (); |
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94 } |
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95 else |
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96 { |
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97 octave_value val = op->rvalue (); |
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98 |
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99 if (! error_state && val.is_defined ()) |
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100 { |
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101 retval = ::do_unary_op (etype, val); |
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102 |
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103 if (error_state) |
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104 { |
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105 retval = octave_value (); |
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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 } |
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113 |
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114 return retval; |
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115 } |
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116 |
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117 void |
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118 tree_prefix_expression::eval_error (void) |
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119 { |
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120 if (error_state > 0) |
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121 ::error ("evaluating prefix operator `%s' near line %d, column %d", |
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122 oper () . c_str (), line (), column ()); |
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123 } |
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124 |
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125 void |
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126 tree_prefix_expression::accept (tree_walker& tw) |
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127 { |
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128 tw.visit_prefix_expression (*this); |
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129 } |
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130 |
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131 // Postfix expressions. |
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132 |
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133 octave_value_list |
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134 tree_postfix_expression::rvalue (int nargout) |
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135 { |
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136 octave_value_list retval; |
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137 |
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138 if (nargout > 1) |
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139 error ("postfix operator `%s': invalid number of output arguments", |
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140 oper () . c_str ()); |
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141 else |
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142 retval = rvalue (); |
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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 octave_value |
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148 tree_postfix_expression::rvalue (void) |
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149 { |
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150 octave_value retval; |
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151 |
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152 MAYBE_DO_BREAKPOINT; |
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153 |
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154 if (error_state) |
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155 return retval; |
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156 |
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157 if (op) |
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158 { |
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159 if (etype == octave_value::op_incr || etype == octave_value::op_decr) |
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160 { |
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161 op->rvalue (); |
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162 |
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163 if (! error_state) |
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164 { |
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165 octave_lvalue ref = op->lvalue (); |
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166 |
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167 if (! error_state && ref.is_defined ()) |
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168 { |
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169 retval = ref.value (); |
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170 |
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171 ref.do_unary_op (etype); |
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172 } |
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173 else |
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174 eval_error (); |
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175 } |
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176 else |
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177 eval_error (); |
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178 } |
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179 else |
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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 && val.is_defined ()) |
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184 { |
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185 retval = ::do_unary_op (etype, val); |
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186 |
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187 if (error_state) |
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188 { |
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189 retval = octave_value (); |
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190 eval_error (); |
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191 } |
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192 } |
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193 else |
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194 eval_error (); |
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195 } |
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196 } |
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197 else |
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198 eval_error (); |
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199 |
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200 return retval; |
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201 } |
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202 |
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203 void |
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204 tree_postfix_expression::eval_error (void) |
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205 { |
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206 if (error_state > 0) |
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207 ::error ("evaluating postfix operator `%s' near line %d, column %d", |
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208 oper () . c_str (), line (), column ()); |
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209 } |
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210 |
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211 void |
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212 tree_postfix_expression::accept (tree_walker& tw) |
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213 { |
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214 tw.visit_postfix_expression (*this); |
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215 } |
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216 |
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217 /* |
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218 ;;; Local Variables: *** |
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219 ;;; mode: C++ *** |
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220 ;;; End: *** |
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221 */ |
