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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 octave_lvalue ref = op->lvalue (); |
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78 |
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79 if (error_state) |
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80 eval_error (); |
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81 else if (ref.is_defined ()) |
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82 { |
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83 ref.do_unary_op (etype); |
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84 |
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85 retval = ref.value (); |
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86 } |
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87 else |
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88 eval_error (); |
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89 } |
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90 else |
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91 { |
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92 octave_value val = op->rvalue (); |
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93 |
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94 if (error_state) |
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95 eval_error (); |
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96 else if (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 |
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111 return retval; |
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112 } |
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113 |
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114 void |
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115 tree_prefix_expression::eval_error (void) |
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116 { |
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117 if (error_state > 0) |
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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 void |
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123 tree_prefix_expression::accept (tree_walker& tw) |
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124 { |
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125 tw.visit_prefix_expression (*this); |
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126 } |
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127 |
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128 // Postfix expressions. |
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129 |
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130 octave_value_list |
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131 tree_postfix_expression::rvalue (int nargout) |
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132 { |
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133 octave_value_list retval; |
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134 |
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135 if (nargout > 1) |
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136 error ("postfix operator `%s': invalid number of output arguments", |
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137 oper () . c_str ()); |
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138 else |
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139 retval = rvalue (); |
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140 |
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141 return retval; |
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142 } |
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143 |
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144 octave_value |
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145 tree_postfix_expression::rvalue (void) |
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146 { |
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147 octave_value retval; |
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148 |
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149 MAYBE_DO_BREAKPOINT; |
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150 |
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151 if (error_state) |
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152 return retval; |
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153 |
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154 if (op) |
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155 { |
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156 if (etype == octave_value::op_incr || etype == octave_value::op_decr) |
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157 { |
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158 octave_lvalue ref = op->lvalue (); |
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159 |
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160 if (error_state) |
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161 eval_error (); |
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162 else if (ref.is_defined ()) |
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163 { |
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164 retval = ref.value (); |
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165 |
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166 ref.do_unary_op (etype); |
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167 } |
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168 else |
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169 eval_error (); |
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170 } |
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171 else |
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172 { |
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173 octave_value val = op->rvalue (); |
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174 |
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175 if (error_state) |
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176 eval_error (); |
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177 else if (val.is_defined ()) |
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178 { |
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179 retval = ::do_unary_op (etype, val); |
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180 |
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181 if (error_state) |
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182 { |
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183 retval = octave_value (); |
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184 eval_error (); |
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185 } |
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186 } |
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187 else |
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188 eval_error (); |
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189 } |
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190 } |
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191 else |
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192 eval_error (); |
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193 |
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194 return retval; |
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195 } |
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196 |
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197 void |
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198 tree_postfix_expression::eval_error (void) |
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199 { |
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200 if (error_state > 0) |
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201 ::error ("evaluating postfix operator `%s' near line %d, column %d", |
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202 oper () . c_str (), line (), column ()); |
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203 } |
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204 |
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205 void |
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206 tree_postfix_expression::accept (tree_walker& tw) |
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207 { |
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208 tw.visit_postfix_expression (*this); |
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209 } |
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210 |
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211 /* |
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212 ;;; Local Variables: *** |
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213 ;;; mode: C++ *** |
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214 ;;; End: *** |
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215 */ |
