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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-map.h" |
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33 #include "oct-obj.h" |
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34 #include "oct-lvalue.h" |
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35 #include "ov.h" |
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36 #include "pager.h" |
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37 #include "pt-arg-list.h" |
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38 #include "pt-bp.h" |
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39 #include "pt-idx.h" |
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40 #include "pt-walk.h" |
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41 #include "utils.h" |
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42 #include "variables.h" |
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43 |
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44 // Index expressions. |
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45 |
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46 tree_index_expression::tree_index_expression (tree_expression *e, |
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47 tree_argument_list *lst, |
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48 int l, int c, type t) |
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49 : tree_expression (l, c), expr (e), list (lst), |
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50 itype (t), arg_nm (lst ? lst->get_arg_names () : string_vector ()) { } |
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51 |
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52 tree_index_expression::tree_index_expression (tree_expression *e, |
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53 const std::string& n, |
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54 int l = -1, int c = -1) |
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55 : tree_expression (l, c), expr (e), list (0), itype (dot), |
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56 arg_nm (n) { } |
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57 |
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58 tree_index_expression::~tree_index_expression (void) |
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59 { |
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60 delete expr; |
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61 delete list; |
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62 } |
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63 |
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64 // This is useful for printing the name of the variable in an indexed |
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65 // assignment. |
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66 |
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67 std::string |
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68 tree_index_expression::name (void) const |
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69 { |
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70 // ??? FIXME ??? |
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71 std::string xname = expr->name (); |
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72 |
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73 return (! dot || xname == "<unknown>") ? xname : xname + "." + arg_nm(0); |
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74 } |
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75 |
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76 octave_value_list |
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77 tree_index_expression::rvalue (int nargout) |
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78 { |
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79 octave_value_list retval; |
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80 |
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81 if (error_state) |
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82 return retval; |
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83 |
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84 octave_value tmp = expr->rvalue (); |
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85 |
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86 if (! error_state) |
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87 { |
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88 if (itype == dot) |
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89 { |
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90 MAYBE_DO_BREAKPOINT; |
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91 |
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92 if (nargout > 1) |
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93 error ("invalid number of output arguments for structure reference"); |
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94 else |
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95 { |
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96 octave_value_list tmp = expr->rvalue (nargout); |
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97 |
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98 if (tmp.empty ()) |
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99 eval_error (); |
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100 else |
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101 { |
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102 octave_value val = tmp(0).do_struct_elt_index_op (arg_nm(0)); |
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103 |
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104 if (print_result () && nargout == 0 && val.is_defined ()) |
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105 { |
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106 // ??? FIXME ??? |
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107 |
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108 std::string xname = name (); |
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109 |
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110 if (xname == "<unknown>") |
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111 bind_ans (val, true); |
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112 else |
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113 val.print_with_name (octave_stdout, xname); |
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114 } |
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115 |
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116 retval = val; |
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117 } |
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118 } |
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119 } |
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120 else if (itype == paren || itype == brace) |
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121 { |
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122 octave_value_list args; |
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123 |
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124 if (list) |
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125 args = list->convert_to_const_vector (); |
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126 |
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127 if (! error_state) |
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128 { |
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129 if (! args.empty ()) |
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130 args.stash_name_tags (arg_nm); |
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131 |
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132 // XXX FIXME XXX -- is this the right thing to do? |
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133 if (tmp.is_constant ()) |
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134 retval = tmp.do_index_op (args); |
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135 else |
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136 retval = tmp.do_multi_index_op (nargout, args); |
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137 } |
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138 else |
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139 eval_error (); |
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140 } |
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141 #if 0 |
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142 else |
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143 panic_impossible (); |
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144 #endif |
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145 } |
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146 else |
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147 eval_error (); |
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148 |
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149 return retval; |
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150 } |
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151 |
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152 octave_value |
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153 tree_index_expression::rvalue (void) |
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154 { |
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155 octave_value retval; |
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156 |
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157 octave_value_list tmp = rvalue (1); |
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158 |
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159 if (! tmp.empty ()) |
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160 retval = tmp(0); |
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161 |
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162 return retval; |
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163 } |
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164 |
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165 octave_lvalue |
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166 tree_index_expression::lvalue (void) |
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167 { |
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168 octave_lvalue retval; |
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169 |
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170 if (! error_state) |
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171 { |
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172 if (itype == dot) |
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173 { |
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174 octave_lvalue tmp = expr->lvalue (); |
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175 |
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176 if (tmp.is_undefined () || ! tmp.is_map ()) |
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177 tmp.define (Octave_map ()); |
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178 |
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179 retval = tmp.struct_elt_ref (arg_nm(0)); |
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180 } |
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181 else if (itype == paren || itype == brace) |
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182 { |
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183 retval = expr->lvalue (); |
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184 |
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185 if (! error_state) |
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186 { |
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187 octave_value_list args; |
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188 |
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189 if (list) |
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190 args = list->convert_to_const_vector (); |
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191 |
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192 retval.set_index (args); |
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193 } |
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194 #if 0 |
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195 else |
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196 panic_impossible (); |
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197 #endif |
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198 } |
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199 } |
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200 |
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201 return retval; |
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202 } |
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203 |
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204 void |
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205 tree_index_expression::eval_error (void) |
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206 { |
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207 if (error_state > 0) |
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208 { |
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209 int l = line (); |
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210 int c = column (); |
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211 |
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212 const char *type_str; |
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213 |
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214 if (itype == dot) |
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215 type_str = "structure reference operator"; |
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216 else if (list) |
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217 type_str = "index expression"; |
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218 else |
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219 type_str = "expression"; |
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220 |
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221 if (l != -1 && c != -1) |
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222 ::error ("evaluating %s near line %d, column %d", type_str, l, c); |
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223 else |
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224 ::error ("evaluating %s", type_str); |
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225 } |
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226 } |
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227 |
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228 void |
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229 tree_index_expression::accept (tree_walker& tw) |
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230 { |
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231 tw.visit_index_expression (*this); |
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232 } |
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233 |
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234 /* |
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235 ;;; Local Variables: *** |
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236 ;;; mode: C++ *** |
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237 ;;; End: *** |
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238 */ |
