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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__) && defined (USE_PRAGMA_INTERFACE_IMPLEMENTATION) |
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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 "ov.h" |
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34 #include "pt-binop.h" |
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35 #include "pt-bp.h" |
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36 #include "pt-walk.h" |
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37 |
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38 // Binary expressions. |
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39 |
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40 octave_value_list |
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41 tree_binary_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 ("binary 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_binary_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 MAYBE_DO_BREAKPOINT; |
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60 |
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61 if (error_state) |
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62 return retval; |
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63 |
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64 if (op_lhs) |
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65 { |
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66 octave_value a = op_lhs->rvalue (); |
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67 |
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68 if (error_state) |
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69 eval_error (); |
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70 else if (a.is_defined () && op_rhs) |
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71 { |
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72 octave_value b = op_rhs->rvalue (); |
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73 |
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74 if (error_state) |
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75 eval_error (); |
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76 else if (b.is_defined ()) |
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77 { |
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78 retval = ::do_binary_op (etype, a, b); |
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79 |
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80 if (error_state) |
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81 { |
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82 retval = octave_value (); |
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83 eval_error (); |
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84 } |
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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 eval_error (); |
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94 |
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95 return retval; |
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96 } |
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97 |
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98 void |
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99 tree_binary_expression::eval_error (void) |
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100 { |
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101 ::error ("evaluating binary operator `%s' near line %d, column %d", |
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102 oper () . c_str (), line (), column ()); |
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103 } |
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104 |
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105 std::string |
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106 tree_binary_expression::oper (void) const |
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107 { |
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108 return octave_value::binary_op_as_string (etype); |
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109 } |
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110 |
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111 void |
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112 tree_binary_expression::accept (tree_walker& tw) |
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113 { |
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114 tw.visit_binary_expression (*this); |
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115 } |
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116 |
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117 // Boolean expressions. |
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118 |
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119 octave_value_list |
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120 tree_boolean_expression::rvalue (int nargout) |
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121 { |
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122 octave_value_list retval; |
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123 |
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124 MAYBE_DO_BREAKPOINT; |
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125 |
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126 if (nargout > 1) |
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127 error ("binary operator `%s': invalid number of output arguments", |
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128 oper () . c_str ()); |
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129 else |
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130 retval = rvalue (); |
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131 |
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132 return retval; |
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133 } |
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134 |
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135 octave_value |
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136 tree_boolean_expression::rvalue (void) |
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137 { |
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138 octave_value retval; |
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139 |
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140 if (error_state) |
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141 return retval; |
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142 |
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143 bool result = false; |
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144 |
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145 if (op_lhs) |
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146 { |
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147 octave_value a = op_lhs->rvalue (); |
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148 |
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149 if (error_state) |
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150 eval_error (); |
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151 else |
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152 { |
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153 bool a_true = a.is_true (); |
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154 |
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155 if (error_state) |
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156 eval_error (); |
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157 else |
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158 { |
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159 if (a_true) |
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160 { |
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161 if (etype == bool_or) |
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162 { |
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163 result = true; |
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164 goto done; |
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165 } |
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166 } |
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167 else |
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168 { |
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169 if (etype == bool_and) |
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170 goto done; |
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171 } |
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172 |
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173 if (op_rhs) |
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174 { |
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175 octave_value b = op_rhs->rvalue (); |
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176 |
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177 if (error_state) |
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178 eval_error (); |
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179 else |
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180 { |
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181 result = b.is_true (); |
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182 |
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183 if (error_state) |
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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 done: |
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191 |
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192 if (! error_state) |
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193 retval = octave_value (result); |
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194 } |
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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 std::string |
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204 tree_boolean_expression::oper (void) const |
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205 { |
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206 std::string retval = "<unknown>"; |
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207 |
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208 switch (etype) |
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209 { |
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210 case bool_and: |
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211 retval = "&&"; |
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212 break; |
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213 |
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214 case bool_or: |
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215 retval = "||"; |
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216 break; |
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217 |
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218 default: |
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219 break; |
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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 /* |
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226 ;;; Local Variables: *** |
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227 ;;; mode: C++ *** |
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228 ;;; End: *** |
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229 */ |
