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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 "ov.h" |
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34 #include "pt-binop.h" |
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35 #include "pt-walk.h" |
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36 |
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37 // Binary expressions. |
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38 |
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39 octave_value_list |
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40 tree_binary_expression::rvalue (int nargout) |
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41 { |
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42 octave_value_list retval; |
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43 |
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44 if (nargout > 1) |
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45 error ("binary operator `%s': invalid number of output arguments", |
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46 oper () . c_str ()); |
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47 else |
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48 retval = rvalue (); |
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49 |
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50 return retval; |
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51 } |
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52 |
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53 octave_value |
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54 tree_binary_expression::rvalue (void) |
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55 { |
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56 octave_value retval; |
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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 if (error_state > 0) |
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99 ::error ("evaluating binary operator `%s' near line %d, column %d", |
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100 oper () . c_str (), line (), column ()); |
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101 } |
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102 |
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103 string |
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104 tree_binary_expression::oper (void) const |
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105 { |
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106 return octave_value::binary_op_as_string (etype); |
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107 } |
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108 |
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109 void |
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110 tree_binary_expression::accept (tree_walker& tw) |
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111 { |
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112 tw.visit_binary_expression (*this); |
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113 } |
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114 |
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115 // Boolean expressions. |
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116 |
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117 octave_value_list |
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118 tree_boolean_expression::rvalue (int nargout) |
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119 { |
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120 octave_value_list retval; |
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121 |
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122 if (nargout > 1) |
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123 error ("binary operator `%s': invalid number of output arguments", |
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124 oper () . c_str ()); |
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125 else |
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126 retval = rvalue (); |
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127 |
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128 return retval; |
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129 } |
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130 |
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131 octave_value |
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132 tree_boolean_expression::rvalue (void) |
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133 { |
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134 octave_value retval; |
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135 |
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136 if (error_state) |
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137 return retval; |
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138 |
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139 bool result = false; |
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140 |
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141 if (op_lhs) |
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142 { |
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143 octave_value a = op_lhs->rvalue (); |
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144 |
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145 if (error_state) |
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146 eval_error (); |
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147 else |
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148 { |
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149 bool a_true = a.is_true (); |
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150 |
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151 if (error_state) |
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152 eval_error (); |
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153 else |
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154 { |
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155 if (a_true) |
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156 { |
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157 if (etype == bool_or) |
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158 { |
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159 result = true; |
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160 goto done; |
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161 } |
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162 } |
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163 else |
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164 { |
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165 if (etype == bool_and) |
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166 goto done; |
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167 } |
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168 |
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169 if (op_rhs) |
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170 { |
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171 octave_value b = op_rhs->rvalue (); |
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172 |
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173 if (error_state) |
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174 eval_error (); |
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175 else |
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176 { |
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177 result = b.is_true (); |
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178 |
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179 if (error_state) |
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180 eval_error (); |
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181 } |
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182 } |
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183 else |
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184 eval_error (); |
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185 |
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186 done: |
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187 |
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188 if (! error_state) |
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189 retval = octave_value (static_cast<double> (result)); |
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190 } |
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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 return retval; |
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197 } |
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198 |
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199 string |
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200 tree_boolean_expression::oper (void) const |
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201 { |
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202 std::string retval = "<unknown>"; |
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203 |
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204 switch (etype) |
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205 { |
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206 case bool_and: |
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207 retval = "&&"; |
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208 break; |
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209 |
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210 case bool_or: |
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211 retval = "||"; |
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212 break; |
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213 |
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214 default: |
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215 break; |
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216 } |
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217 |
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218 return retval; |
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219 } |
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220 |
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221 /* |
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222 ;;; Local Variables: *** |
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223 ;;; mode: C++ *** |
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224 ;;; End: *** |
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225 */ |
