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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 <iostream.h> |
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32 #include <strstream.h> |
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33 |
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34 #include "defun.h" |
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35 #include "error.h" |
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36 #include "input.h" |
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37 #include "oct-obj.h" |
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38 #include "oct-lvalue.h" |
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39 #include "pager.h" |
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40 #include "ov.h" |
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41 #include "pt-arg-list.h" |
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42 #include "pt-assign.h" |
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43 #include "pt-walk.h" |
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44 #include "utils.h" |
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45 |
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46 // TRUE means print the right hand side of an assignment instead of |
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47 // the left. |
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48 static bool Vprint_rhs_assign_val; |
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49 |
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50 // Simple assignment expressions. |
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51 |
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52 tree_simple_assignment::~tree_simple_assignment (void) |
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53 { |
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54 if (! preserve) |
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55 delete lhs; |
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56 |
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57 delete rhs; |
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58 } |
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59 |
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60 octave_value_list |
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61 tree_simple_assignment::rvalue (int nargout) |
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62 { |
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63 octave_value_list retval; |
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64 |
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65 if (nargout > 1) |
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66 error ("invalid number of output arguments for expression X = RHS"); |
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67 else |
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68 retval = rvalue (); |
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69 |
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70 return retval; |
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71 } |
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72 |
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73 // XXX FIXME XXX -- this works, but it would look a little better if |
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74 // it were broken up into a couple of separate functions. |
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75 |
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76 octave_value |
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77 tree_simple_assignment::rvalue (void) |
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78 { |
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79 octave_value rhs_val; |
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80 |
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81 if (error_state) |
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82 return rhs_val; |
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83 |
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84 if (rhs) |
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85 { |
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86 octave_value_list tmp = rhs->rvalue (); |
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87 |
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88 if (! (error_state || tmp.empty ())) |
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89 { |
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90 rhs_val = tmp(0); |
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91 |
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92 if (rhs_val.is_undefined ()) |
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93 { |
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94 error ("value on right hand side of assignment is undefined"); |
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95 eval_error (); |
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96 } |
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97 else |
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98 { |
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99 octave_lvalue ult = lhs->lvalue (); |
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100 |
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101 if (error_state) |
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102 eval_error (); |
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103 else |
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104 { |
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105 ult.assign (etype, rhs_val); |
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106 |
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107 // We clear any index here so that we can get the |
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108 // new value of the referenced object below, instead |
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109 // of the indexed value (which should be the same as |
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110 // the right hand side value). |
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111 |
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112 ult.clear_index (); |
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113 |
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114 if (error_state) |
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115 eval_error (); |
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116 else |
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117 { |
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118 octave_value lhs_val = ult.value (); |
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119 |
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120 if (! error_state && print_result ()) |
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121 { |
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122 if (Vprint_rhs_assign_val) |
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123 rhs_val.print_with_name (octave_stdout, |
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124 lhs->str_print_code ()); |
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125 else |
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126 lhs_val.print_with_name (octave_stdout, |
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127 lhs->name ()); |
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128 } |
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129 } |
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130 } |
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131 } |
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132 } |
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133 else |
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134 eval_error (); |
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135 } |
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136 |
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137 return rhs_val; |
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138 } |
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139 |
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140 void |
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141 tree_simple_assignment::eval_error (void) |
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142 { |
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143 if (error_state > 0) |
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144 { |
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145 int l = line (); |
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146 int c = column (); |
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147 |
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148 if (l != -1 && c != -1) |
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149 ::error ("evaluating assignment expression near line %d, column %d", |
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150 l, c); |
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151 } |
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152 } |
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153 |
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154 string |
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155 tree_simple_assignment::oper (void) const |
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156 { |
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157 return octave_value::assign_op_as_string (etype); |
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158 } |
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159 |
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160 void |
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161 tree_simple_assignment::accept (tree_walker& tw) |
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162 { |
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163 tw.visit_simple_assignment (*this); |
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164 } |
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165 |
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166 // Multi-valued assignment expressions. |
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167 |
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168 tree_multi_assignment::~tree_multi_assignment (void) |
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169 { |
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170 if (! preserve) |
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171 delete lhs; |
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172 |
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173 delete rhs; |
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174 } |
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175 |
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176 octave_value |
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177 tree_multi_assignment::rvalue (void) |
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178 { |
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179 octave_value retval; |
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180 |
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181 octave_value_list tmp = rvalue (1); |
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182 |
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183 if (! tmp.empty ()) |
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184 retval = tmp(0); |
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185 |
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186 return retval; |
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187 } |
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188 |
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189 // XXX FIXME XXX -- this works, but it would look a little better if |
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190 // it were broken up into a couple of separate functions. |
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191 |
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192 octave_value_list |
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193 tree_multi_assignment::rvalue (int) |
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194 { |
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195 octave_value_list rhs_val; |
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196 |
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197 if (error_state) |
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198 return rhs_val; |
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199 |
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200 if (rhs) |
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201 { |
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202 int n_out = lhs->length (); |
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203 |
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204 rhs_val = rhs->rvalue (n_out); |
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205 |
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206 if (! (error_state || rhs_val.empty ())) |
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207 { |
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208 if (rhs_val.empty ()) |
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209 { |
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210 error ("value on right hand side of assignment is undefined"); |
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211 eval_error (); |
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212 } |
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213 else |
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214 { |
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215 int k = 0; |
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216 |
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217 int n = rhs_val.length (); |
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218 |
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219 for (Pix p = lhs->first (); p != 0; lhs->next (p)) |
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220 { |
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221 tree_expression *lhs_elt = lhs->operator () (p); |
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222 |
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223 if (lhs_elt) |
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224 { |
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225 octave_lvalue ult = lhs_elt->lvalue (); |
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226 |
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227 if (error_state) |
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228 eval_error (); |
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229 else |
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230 { |
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231 octave_value tmp = k < n |
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232 ? rhs_val(k++) : octave_value (); |
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233 |
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234 if (tmp.is_defined ()) |
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235 { |
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236 // XXX FIXME XXX -- handle other assignment ops. |
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237 ult.assign (octave_value::asn_eq, tmp); |
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238 |
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239 // We clear any index here so that we |
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240 // can get the new value of the |
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241 // referenced object below, instead of |
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242 // the indexed value (which should be |
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243 // the same as the right hand side |
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244 // value). |
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245 |
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246 ult.clear_index (); |
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247 } |
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248 else |
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249 error ("element number %d undefined in return list", k); |
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250 |
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251 if (error_state) |
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252 eval_error (); |
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253 else if (! Vprint_rhs_assign_val) |
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254 { |
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255 octave_value lhs_val = ult.value (); |
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256 |
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257 if (! error_state && print_result ()) |
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258 { |
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259 if (Vprint_rhs_assign_val) |
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260 tmp.print_with_name (octave_stdout, |
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261 lhs_elt->str_print_code ()); |
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262 else |
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263 lhs_val.print_with_name (octave_stdout, |
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264 lhs_elt->name ()); |
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265 } |
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266 } |
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267 } |
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268 } |
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269 |
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270 if (error_state) |
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271 break; |
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272 } |
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273 } |
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274 } |
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275 else |
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276 eval_error (); |
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277 } |
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278 |
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279 return rhs_val; |
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280 } |
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281 |
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282 void |
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283 tree_multi_assignment::eval_error (void) |
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284 { |
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285 if (error_state > 0) |
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286 { |
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287 int l = line (); |
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288 int c = column (); |
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289 |
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290 if (l != -1 && c != -1) |
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291 ::error ("evaluating assignment expression near line %d, column %d", |
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292 l, c); |
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293 } |
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294 } |
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295 |
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296 void |
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297 tree_multi_assignment::accept (tree_walker& tw) |
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298 { |
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299 tw.visit_multi_assignment (*this); |
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300 } |
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301 |
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302 static int |
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303 print_rhs_assign_val (void) |
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304 { |
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305 Vprint_rhs_assign_val = check_preference ("print_rhs_assign_val"); |
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306 |
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307 return 0; |
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308 } |
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309 |
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310 void |
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311 symbols_of_pt_assign (void) |
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312 { |
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313 DEFVAR (print_rhs_assign_val, 0.0, 0, print_rhs_assign_val, |
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314 "if TRUE, print the right hand side of assignments instead of the left"); |
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315 } |
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316 |
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317 /* |
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318 ;;; Local Variables: *** |
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319 ;;; mode: C++ *** |
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320 ;;; End: *** |
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321 */ |
