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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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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20 02110-1301, USA. |
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21 |
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22 */ |
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23 |
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24 #ifdef HAVE_CONFIG_H |
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25 #include <config.h> |
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26 #endif |
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27 |
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28 #include "error.h" |
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29 #include "oct-obj.h" |
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30 #include "ov.h" |
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31 #include "pt-binop.h" |
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32 #include "pt-bp.h" |
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33 #include "pt-walk.h" |
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34 |
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35 // Binary expressions. |
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36 |
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37 octave_value_list |
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38 tree_binary_expression::rvalue (int nargout) |
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39 { |
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40 octave_value_list retval; |
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41 |
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42 if (nargout > 1) |
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43 error ("binary operator `%s': invalid number of output arguments", |
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44 oper () . c_str ()); |
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45 else |
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46 retval = rvalue (); |
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47 |
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48 return retval; |
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49 } |
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50 |
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51 octave_value |
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52 tree_binary_expression::rvalue (void) |
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53 { |
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54 octave_value retval; |
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55 |
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56 MAYBE_DO_BREAKPOINT; |
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57 |
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58 if (error_state) |
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59 return retval; |
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60 |
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61 if (op_lhs) |
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62 { |
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63 octave_value a = op_lhs->rvalue (); |
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64 |
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65 if (error_state) |
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66 eval_error (); |
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67 else if (a.is_defined () && op_rhs) |
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68 { |
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69 octave_value b = op_rhs->rvalue (); |
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70 |
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71 if (error_state) |
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72 eval_error (); |
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73 else if (b.is_defined ()) |
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74 { |
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75 retval = ::do_binary_op (etype, a, b); |
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76 |
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77 if (error_state) |
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78 { |
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79 retval = octave_value (); |
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80 eval_error (); |
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81 } |
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82 } |
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83 else |
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84 eval_error (); |
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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 return retval; |
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93 } |
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94 |
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95 void |
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96 tree_binary_expression::eval_error (void) |
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97 { |
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98 ::error ("evaluating binary operator `%s' near line %d, column %d", |
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99 oper () . c_str (), line (), column ()); |
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100 } |
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101 |
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102 std::string |
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103 tree_binary_expression::oper (void) const |
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104 { |
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105 return octave_value::binary_op_as_string (etype); |
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106 } |
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107 |
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108 void |
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109 tree_binary_expression::accept (tree_walker& tw) |
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110 { |
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111 tw.visit_binary_expression (*this); |
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112 } |
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113 |
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114 // Boolean expressions. |
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115 |
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116 octave_value_list |
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117 tree_boolean_expression::rvalue (int nargout) |
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118 { |
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119 octave_value_list retval; |
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120 |
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121 MAYBE_DO_BREAKPOINT; |
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122 |
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123 if (nargout > 1) |
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124 error ("binary operator `%s': invalid number of output arguments", |
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125 oper () . c_str ()); |
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126 else |
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127 retval = rvalue (); |
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128 |
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129 return retval; |
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130 } |
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131 |
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132 octave_value |
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133 tree_boolean_expression::rvalue (void) |
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134 { |
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135 octave_value retval; |
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136 |
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137 if (error_state) |
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138 return retval; |
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139 |
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140 bool result = false; |
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141 |
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142 if (op_lhs) |
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143 { |
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144 octave_value a = op_lhs->rvalue (); |
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145 |
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146 if (error_state) |
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147 eval_error (); |
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148 else |
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149 { |
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150 bool a_true = a.is_true (); |
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151 |
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152 if (error_state) |
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153 eval_error (); |
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154 else |
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155 { |
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156 if (a_true) |
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157 { |
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158 if (etype == bool_or) |
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159 { |
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160 result = true; |
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161 goto done; |
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162 } |
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163 } |
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164 else |
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165 { |
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166 if (etype == bool_and) |
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167 goto done; |
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168 } |
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169 |
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170 if (op_rhs) |
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171 { |
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172 octave_value b = op_rhs->rvalue (); |
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173 |
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174 if (error_state) |
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175 eval_error (); |
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176 else |
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177 { |
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178 result = b.is_true (); |
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179 |
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180 if (error_state) |
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181 eval_error (); |
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182 } |
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183 } |
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184 else |
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185 eval_error (); |
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186 |
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187 done: |
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188 |
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189 if (! error_state) |
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190 retval = octave_value (result); |
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191 } |
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192 } |
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193 } |
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194 else |
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195 eval_error (); |
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196 |
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197 return retval; |
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198 } |
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199 |
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200 std::string |
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201 tree_boolean_expression::oper (void) const |
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202 { |
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203 std::string retval = "<unknown>"; |
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204 |
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205 switch (etype) |
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206 { |
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207 case bool_and: |
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208 retval = "&&"; |
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209 break; |
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210 |
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211 case bool_or: |
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212 retval = "||"; |
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213 break; |
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214 |
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215 default: |
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216 break; |
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217 } |
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218 |
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219 return retval; |
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220 } |
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221 |
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222 /* |
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223 ;;; Local Variables: *** |
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224 ;;; mode: C++ *** |
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225 ;;; End: *** |
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226 */ |
