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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-unop.h" |
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36 #include "pt-walk.h" |
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37 |
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38 // Unary expressions. |
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39 |
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40 string |
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41 tree_unary_expression::oper (void) const |
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42 { |
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43 return octave_value::unary_op_as_string (etype); |
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44 } |
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45 |
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46 // Prefix expressions. |
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47 |
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48 octave_value_list |
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49 tree_prefix_expression::rvalue (int nargout) |
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50 { |
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51 octave_value_list retval; |
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52 |
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53 if (nargout > 1) |
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54 error ("prefix operator `%s': invalid number of output arguments", |
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55 oper () . c_str ()); |
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56 else |
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57 retval = rvalue (); |
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58 |
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59 return retval; |
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60 } |
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61 |
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62 octave_value |
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63 tree_prefix_expression::rvalue (void) |
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64 { |
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65 octave_value retval; |
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66 |
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67 if (error_state) |
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68 return retval; |
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69 |
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70 if (op) |
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71 { |
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72 if (etype == octave_value::incr || etype == octave_value::decr) |
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73 { |
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74 octave_lvalue ref = op->lvalue (); |
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75 |
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76 if (error_state) |
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77 eval_error (); |
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78 else if (ref.is_defined ()) |
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79 { |
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80 ref.do_unary_op (etype); |
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81 |
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82 retval = ref.value (); |
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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 { |
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89 octave_value val = op->rvalue (); |
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90 |
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91 if (error_state) |
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92 eval_error (); |
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93 else if (val.is_defined ()) |
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94 { |
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95 retval = ::do_unary_op (etype, val); |
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96 |
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97 if (error_state) |
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98 { |
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99 retval = octave_value (); |
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100 eval_error (); |
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101 } |
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102 } |
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103 else |
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104 eval_error (); |
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105 } |
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106 } |
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107 |
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108 return retval; |
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109 } |
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110 |
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111 void |
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112 tree_prefix_expression::eval_error (void) |
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113 { |
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114 if (error_state > 0) |
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115 ::error ("evaluating prefix operator `%s' near line %d, column %d", |
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116 oper () . c_str (), line (), column ()); |
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117 } |
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118 |
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119 void |
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120 tree_prefix_expression::accept (tree_walker& tw) |
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121 { |
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122 tw.visit_prefix_expression (*this); |
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123 } |
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124 |
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125 // Postfix expressions. |
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126 |
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127 octave_value_list |
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128 tree_postfix_expression::rvalue (int nargout) |
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129 { |
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130 octave_value_list retval; |
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131 |
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132 if (nargout > 1) |
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133 error ("postfix operator `%s': invalid number of output arguments", |
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134 oper () . c_str ()); |
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135 else |
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136 retval = rvalue (); |
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137 |
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138 return retval; |
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139 } |
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140 |
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141 octave_value |
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142 tree_postfix_expression::rvalue (void) |
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143 { |
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144 octave_value retval; |
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145 |
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146 if (error_state) |
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147 return retval; |
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148 |
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149 if (op) |
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150 { |
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151 if (etype == octave_value::incr || etype == octave_value::decr) |
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152 { |
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153 octave_lvalue ref = op->lvalue (); |
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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 if (ref.is_defined ()) |
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158 { |
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159 retval = ref.value (); |
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160 |
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161 ref.do_unary_op (etype); |
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162 } |
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163 else |
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164 eval_error (); |
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165 } |
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166 else |
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167 { |
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168 octave_value val = op->rvalue (); |
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169 |
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170 if (error_state) |
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171 eval_error (); |
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172 else if (val.is_defined ()) |
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173 { |
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174 retval = ::do_unary_op (etype, val); |
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175 |
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176 if (error_state) |
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177 { |
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178 retval = octave_value (); |
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179 eval_error (); |
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180 } |
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181 } |
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182 else |
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183 eval_error (); |
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184 } |
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185 } |
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186 else |
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187 eval_error (); |
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188 |
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189 return retval; |
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190 } |
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191 |
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192 void |
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193 tree_postfix_expression::eval_error (void) |
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194 { |
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195 if (error_state > 0) |
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196 ::error ("evaluating postfix operator `%s' near line %d, column %d", |
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197 oper () . c_str (), line (), column ()); |
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198 } |
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199 |
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200 void |
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201 tree_postfix_expression::accept (tree_walker& tw) |
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202 { |
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203 tw.visit_postfix_expression (*this); |
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204 } |
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205 |
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206 /* |
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207 ;;; Local Variables: *** |
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208 ;;; mode: C++ *** |
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209 ;;; End: *** |
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210 */ |
