Mercurial > octave
annotate libinterp/parse-tree/pt-idx.cc @ 26660:e4909f142491
* pt-idx.cc (tree_index_expression::lvalue): Style fix.
author | John W. Eaton <jwe@octave.org> |
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date | Sat, 26 Jan 2019 15:53:29 +0000 |
parents | 00f796120a6d |
children | 05fc703b419a |
rev | line source |
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2980 | 1 /* |
2 | |
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3 Copyright (C) 1996-2019 John W. Eaton |
2980 | 4 |
5 This file is part of Octave. | |
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 |
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9 the Free Software Foundation, either version 3 of the License, or |
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10 (at your option) any later version. |
2980 | 11 |
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12 Octave is distributed in the hope that it will be useful, but |
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13 WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 GNU General Public License for more details. |
2980 | 16 |
17 You should have received a copy of the GNU General Public License | |
7016 | 18 along with Octave; see the file COPYING. If not, see |
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19 <https://www.gnu.org/licenses/>. |
2980 | 20 |
21 */ | |
22 | |
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23 #if defined (HAVE_CONFIG_H) |
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24 # include "config.h" |
2980 | 25 #endif |
26 | |
3933 | 27 #include "Cell.h" |
2980 | 28 #include "error.h" |
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29 #include "interpreter-private.h" |
3930 | 30 #include "oct-map.h" |
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31 #include "ovl.h" |
2980 | 32 #include "oct-lvalue.h" |
33 #include "ov.h" | |
2982 | 34 #include "pt-arg-list.h" |
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35 #include "pt-eval.h" |
7336 | 36 #include "pt-id.h" |
2980 | 37 #include "pt-idx.h" |
3930 | 38 #include "utils.h" |
39 #include "variables.h" | |
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40 #include "errwarn.h" |
2980 | 41 |
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42 namespace octave |
3933 | 43 { |
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44 // Index expressions. |
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45 |
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46 tree_index_expression::tree_index_expression (int l, int c) |
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47 : tree_expression (l, c), m_expr (nullptr), m_args (0), m_type (), |
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48 m_arg_nm (), m_dyn_field () { } |
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49 |
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50 tree_index_expression::tree_index_expression (tree_expression *e, |
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51 tree_argument_list *lst, |
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52 int l, int c, char t) |
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53 : tree_expression (l, c), m_expr (e), m_args (0), m_type (), |
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54 m_arg_nm (), m_dyn_field () |
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55 { |
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56 append (lst, t); |
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57 } |
4131 | 58 |
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59 tree_index_expression::tree_index_expression (tree_expression *e, |
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60 const std::string& n, |
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61 int l, int c) |
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62 : tree_expression (l, c), m_expr (e), m_args (0), m_type (), |
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63 m_arg_nm (), m_dyn_field () |
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64 { |
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65 append (n); |
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66 } |
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68 tree_index_expression::tree_index_expression (tree_expression *e, |
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69 tree_expression *df, |
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70 int l, int c) |
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71 : tree_expression (l, c), m_expr (e), m_args (0), m_type (), |
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72 m_arg_nm (), m_dyn_field () |
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73 { |
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74 append (df); |
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75 } |
3933 | 76 |
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77 void |
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78 tree_index_expression::append (tree_argument_list *lst, char t) |
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79 { |
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80 m_args.push_back (lst); |
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81 m_type.append (1, t); |
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82 m_arg_nm.push_back (lst ? lst->get_arg_names () : string_vector ()); |
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83 m_dyn_field.push_back (static_cast<tree_expression *> (nullptr)); |
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84 |
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85 if (lst && lst->has_magic_tilde ()) |
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86 error ("invalid use of empty argument (~) in index expression"); |
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87 } |
13970 | 88 |
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89 void |
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90 tree_index_expression::append (const std::string& n) |
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91 { |
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92 m_args.push_back (static_cast<tree_argument_list *> (nullptr)); |
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93 m_type += '.'; |
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94 m_arg_nm.push_back (n); |
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95 m_dyn_field.push_back (static_cast<tree_expression *> (nullptr)); |
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96 } |
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97 |
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98 void |
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99 tree_index_expression::append (tree_expression *df) |
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100 { |
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101 m_args.push_back (static_cast<tree_argument_list *> (nullptr)); |
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102 m_type += '.'; |
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103 m_arg_nm.push_back (""); |
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104 m_dyn_field.push_back (df); |
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105 } |
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106 |
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107 tree_index_expression::~tree_index_expression (void) |
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108 { |
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109 delete m_expr; |
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110 |
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111 while (! m_args.empty ()) |
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112 { |
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113 auto p = m_args.begin (); |
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114 delete *p; |
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115 m_args.erase (p); |
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116 } |
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118 while (! m_dyn_field.empty ()) |
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119 { |
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120 auto p = m_dyn_field.begin (); |
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121 delete *p; |
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122 m_dyn_field.erase (p); |
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123 } |
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124 } |
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126 bool |
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127 tree_index_expression::has_magic_end (void) const |
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128 { |
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129 for (const tree_argument_list *elt : m_args) |
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130 { |
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131 if (elt && elt->has_magic_end ()) |
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132 return true; |
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133 } |
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135 return false; |
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136 } |
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137 |
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138 // This is useful for printing the name of the variable in an indexed |
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139 // assignment. |
2991 | 140 |
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141 std::string |
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142 tree_index_expression::name (void) const |
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143 { |
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144 return m_expr->name (); |
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145 } |
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147 static inline octave_value_list |
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148 make_value_list (tree_evaluator& tw, |
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149 tree_argument_list *m_args, |
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150 const string_vector& m_arg_nm, const octave_value *object, |
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151 bool rvalue = true) |
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152 { |
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153 octave_value_list retval; |
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154 |
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155 if (m_args) |
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156 { |
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157 if (rvalue && object && m_args->has_magic_end () |
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158 && object->is_undefined ()) |
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159 err_invalid_inquiry_subscript (); |
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161 retval = tw.convert_to_const_vector (m_args, object); |
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162 } |
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164 octave_idx_type n = retval.length (); |
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166 if (n > 0) |
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167 retval.stash_name_tags (m_arg_nm); |
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169 return retval; |
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170 } |
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171 |
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172 std::string |
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173 tree_index_expression::get_struct_index |
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174 (tree_evaluator& tw, |
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175 std::list<string_vector>::const_iterator p_arg_nm, |
4219 | 176 std::list<tree_expression *>::const_iterator p_dyn_field) const |
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177 { |
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178 std::string fn = (*p_arg_nm)(0); |
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180 if (fn.empty ()) |
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181 { |
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182 tree_expression *df = *p_dyn_field; |
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184 if (df) |
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185 { |
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186 octave_value t = tw.evaluate (df); |
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188 fn = t.xstring_value ("dynamic structure field names must be strings"); |
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189 } |
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190 else |
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191 panic_impossible (); |
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192 } |
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194 return fn; |
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195 } |
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196 |
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197 octave_lvalue |
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198 tree_index_expression::lvalue (tree_evaluator& tw) |
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199 { |
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200 std::list<octave_value_list> idx; |
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201 std::string tmp_type; |
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202 |
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203 int n = m_args.size (); |
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204 |
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205 auto p_args = m_args.begin (); |
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206 auto p_arg_nm = m_arg_nm.begin (); |
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207 auto p_dyn_field = m_dyn_field.begin (); |
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208 |
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209 octave_lvalue retval = m_expr->lvalue (tw); |
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210 |
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211 octave_value tmp = retval.value (); |
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212 |
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213 octave_idx_type tmpi = 0; |
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214 std::list<octave_value_list> tmpidx; |
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215 |
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216 for (int i = 0; i < n; i++) |
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217 { |
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218 if (retval.numel () != 1) |
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219 err_indexed_cs_list (); |
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220 |
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221 if (tmpi < i) |
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222 { |
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223 try |
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224 { |
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225 tmp = tmp.subsref (m_type.substr (tmpi, i-tmpi), tmpidx, true); |
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226 } |
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227 catch (index_exception& e) // problems with range, invalid type etc. |
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228 { |
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229 tw.final_index_error (e, m_expr); |
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230 } |
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231 |
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232 tmpidx.clear (); |
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233 } |
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234 |
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235 switch (m_type[i]) |
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236 { |
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237 case '(': |
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238 { |
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239 octave_value_list tidx |
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240 = make_value_list (tw, *p_args, *p_arg_nm, &tmp, false); |
4432 | 241 |
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242 idx.push_back (tidx); |
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244 if (i < n - 1) |
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245 { |
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246 if (m_type[i+1] != '.') |
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247 error ("() must be followed by . or close the index chain"); |
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248 |
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249 tmpidx.push_back (tidx); |
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250 tmpi = i+1; |
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251 } |
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252 } |
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253 break; |
3930 | 254 |
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255 case '{': |
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256 { |
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257 octave_value_list tidx |
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258 = make_value_list (tw, *p_args, *p_arg_nm, &tmp, false); |
3933 | 259 |
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260 if (tmp.is_undefined ()) |
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261 { |
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262 if (tidx.has_magic_colon ()) |
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263 err_invalid_inquiry_subscript (); |
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264 |
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265 tmp = Cell (); |
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266 } |
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267 else if (tmp.is_zero_by_zero () |
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268 && (tmp.is_matrix_type () || tmp.is_string ())) |
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269 { |
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270 tmp = Cell (); |
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271 } |
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272 |
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273 retval.numel (tmp.numel (tidx)); |
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274 |
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275 idx.push_back (tidx); |
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276 tmpidx.push_back (tidx); |
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277 tmpi = i; |
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278 } |
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279 break; |
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281 case '.': |
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282 { |
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283 octave_value tidx = get_struct_index (tw, p_arg_nm, p_dyn_field); |
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284 |
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285 bool autoconv = (tmp.is_zero_by_zero () |
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286 && (tmp.is_matrix_type () || tmp.is_string () |
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287 || tmp.iscell ())); |
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289 if (i > 0 && m_type[i-1] == '(') |
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290 { |
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291 octave_value_list pidx = idx.back (); |
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292 |
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293 // Use octave_map, not octave_scalar_map so that the |
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294 // dimensions are 0x0, not 1x1. |
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295 if (tmp.is_undefined ()) |
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296 { |
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297 if (pidx.has_magic_colon ()) |
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298 err_invalid_inquiry_subscript (); |
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299 |
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300 tmp = octave_map (); |
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301 } |
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302 else if (autoconv) |
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303 tmp = octave_map (); |
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305 retval.numel (tmp.numel (pidx)); |
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307 tmpi = i-1; |
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308 tmpidx.push_back (tidx); |
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309 } |
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310 else |
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311 { |
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312 if (tmp.is_undefined () || autoconv) |
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313 { |
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314 tmpi = i+1; |
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315 tmp = octave_value (); |
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316 } |
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317 else |
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318 { |
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319 retval.numel (tmp.numel (octave_value_list ())); |
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321 tmpi = i; |
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322 tmpidx.push_back (tidx); |
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323 } |
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324 } |
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325 |
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326 idx.push_back (tidx); |
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327 } |
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328 break; |
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329 |
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330 default: |
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331 panic_impossible (); |
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332 } |
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333 |
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334 if (idx.back ().empty ()) |
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335 error ("invalid empty index list"); |
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337 p_args++; |
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338 p_arg_nm++; |
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339 p_dyn_field++; |
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340 } |
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341 |
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342 retval.set_index (m_type, idx); |
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343 |
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344 return retval; |
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345 } |
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347 tree_index_expression * |
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348 tree_index_expression::dup (symbol_scope& scope) const |
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349 { |
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350 tree_index_expression *new_idx_expr |
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351 = new tree_index_expression (line (), column ()); |
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352 |
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353 new_idx_expr->m_expr = (m_expr ? m_expr->dup (scope) : nullptr); |
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354 |
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355 std::list<tree_argument_list *> new_args; |
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357 for (const tree_argument_list *elt : m_args) |
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358 new_args.push_back (elt ? elt->dup (scope) : nullptr); |
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359 |
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360 new_idx_expr->m_args = new_args; |
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362 new_idx_expr->m_type = m_type; |
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363 |
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364 new_idx_expr->m_arg_nm = m_arg_nm; |
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366 std::list<tree_expression *> new_dyn_field; |
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367 |
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368 for (const tree_expression *elt : m_dyn_field) |
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369 new_dyn_field.push_back (elt ? elt->dup (scope) : nullptr); |
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370 |
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371 new_idx_expr->m_dyn_field = new_dyn_field; |
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372 |
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373 new_idx_expr->copy_base (*this); |
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375 return new_idx_expr; |
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376 } |
2980 | 377 } |
378 | |
7099 | 379 /* |
380 %!test | |
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381 %! clear x; |
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382 %! clear y; |
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383 %! y = 3; |
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384 %! x(y(end)) = 1; |
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385 %! assert (x, [0, 0, 1]); |
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386 %! clear x; |
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387 %! clear y; |
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388 %! y = {3}; |
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389 %! x(y{end}) = 1; |
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390 %! assert (x, [0, 0, 1]); |
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391 |
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392 %!test |
7099 | 393 %! x = {1, 2, 3}; |
394 %! [x{:}] = deal (4, 5, 6); | |
395 %! assert (x, {4, 5, 6}); | |
396 | |
397 %!test | |
398 %! [x.a, x.b.c] = deal (1, 2); | |
399 %! assert (x.a == 1 && x.b.c == 2); | |
400 | |
401 %!test | |
402 %! [x.a, x(2).b] = deal (1, 2); | |
403 %! assert (x(1).a == 1 && isempty (x(2).a) && isempty (x(1).b) && x(2).b == 2); | |
404 | |
405 %!test | |
406 %! x = struct (zeros (0, 1), {"a", "b"}); | |
407 %! x(2).b = 1; | |
408 %! assert (x(2).b == 1); | |
409 | |
410 %!test | |
411 %! x = struct (zeros (0, 1), {"a", "b"}); | |
412 %! x(2).b = 1; | |
413 %! assert (x(2).b == 1); | |
414 */ |