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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-pr-code.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 if (error_state) |
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60 return retval; |
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61 |
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62 if (op_lhs) |
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63 { |
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64 octave_value a = op_lhs->rvalue (); |
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65 |
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66 if (error_state) |
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67 eval_error (); |
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68 else if (a.is_defined () && op_rhs) |
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69 { |
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70 octave_value b = op_rhs->rvalue (); |
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71 |
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72 if (error_state) |
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73 eval_error (); |
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74 else if (b.is_defined ()) |
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75 { |
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76 retval = ::do_binary_op (etype, a, b); |
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77 |
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78 if (error_state) |
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79 { |
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80 retval = octave_value (); |
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81 eval_error (); |
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82 } |
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83 } |
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84 else |
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85 eval_error (); |
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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 eval_error (); |
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92 |
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93 return retval; |
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94 } |
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95 |
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96 void |
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97 tree_binary_expression::eval_error (void) |
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98 { |
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99 if (error_state > 0) |
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100 ::error ("evaluating binary operator `%s' near line %d, column %d", |
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101 oper () . c_str (), line (), column ()); |
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102 } |
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103 |
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104 string |
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105 tree_binary_expression::oper (void) const |
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106 { |
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107 return octave_value::binary_op_as_string (etype); |
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108 } |
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109 |
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110 void |
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111 tree_binary_expression::accept (tree_walker& tw) |
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112 { |
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113 tw.visit_binary_expression (*this); |
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114 } |
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115 |
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116 // Boolean expressions. |
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117 |
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118 octave_value_list |
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119 tree_boolean_expression::rvalue (int nargout) |
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120 { |
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121 octave_value_list retval; |
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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 (static_cast<double> (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 string |
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201 tree_boolean_expression::oper (void) const |
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202 { |
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203 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 */ |
