Mercurial > octave
annotate libinterp/parse-tree/pt-idx.cc @ 31073:396f60e0b984
maint: merge stable to default
author | Arun Giridhar <arungiridhar@gmail.com> |
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date | Sun, 05 Jun 2022 18:11:28 -0400 |
parents | 08b08b7f05b2 277e31f0bb60 |
children | e88a07dec498 |
rev | line source |
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1 //////////////////////////////////////////////////////////////////////// |
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2 // |
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3 // Copyright (C) 1996-2022 The Octave Project Developers |
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4 // |
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5 // See the file COPYRIGHT.md in the top-level directory of this |
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6 // distribution or <https://octave.org/copyright/>. |
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7 // |
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8 // This file is part of Octave. |
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9 // |
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10 // Octave is free software: you can redistribute it and/or modify it |
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11 // under the terms of the GNU General Public License as published by |
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12 // the Free Software Foundation, either version 3 of the License, or |
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13 // (at your option) any later version. |
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14 // |
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15 // Octave is distributed in the hope that it will be useful, but |
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16 // WITHOUT ANY WARRANTY; without even the implied warranty of |
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17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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18 // GNU General Public License for more details. |
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19 // |
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20 // You should have received a copy of the GNU General Public License |
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21 // along with Octave; see the file COPYING. If not, see |
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22 // <https://www.gnu.org/licenses/>. |
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23 // |
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24 //////////////////////////////////////////////////////////////////////// |
2980 | 25 |
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26 #if defined (HAVE_CONFIG_H) |
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27 # include "config.h" |
2980 | 28 #endif |
29 | |
3933 | 30 #include "Cell.h" |
2980 | 31 #include "error.h" |
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32 #include "interpreter-private.h" |
3930 | 33 #include "oct-map.h" |
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34 #include "ovl.h" |
2980 | 35 #include "oct-lvalue.h" |
36 #include "ov.h" | |
2982 | 37 #include "pt-arg-list.h" |
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38 #include "pt-eval.h" |
7336 | 39 #include "pt-id.h" |
2980 | 40 #include "pt-idx.h" |
3930 | 41 #include "utils.h" |
42 #include "variables.h" | |
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43 #include "errwarn.h" |
2980 | 44 |
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45 namespace octave |
3933 | 46 { |
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47 // Index expressions. |
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48 |
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49 tree_index_expression::tree_index_expression (int l, int c) |
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50 : tree_expression (l, c), m_expr (nullptr), m_args (0), m_type (), |
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51 m_arg_nm (), m_dyn_field (), m_word_list_cmd (false) { } |
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52 |
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53 tree_index_expression::tree_index_expression (tree_expression *e, |
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54 tree_argument_list *lst, |
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55 int l, int c, char t) |
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56 : tree_expression (l, c), m_expr (e), m_args (0), m_type (), |
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57 m_arg_nm (), m_dyn_field (), m_word_list_cmd (false) |
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58 { |
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59 append (lst, t); |
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60 } |
4131 | 61 |
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62 tree_index_expression::tree_index_expression (tree_expression *e, |
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63 const std::string& n, |
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64 int l, int c) |
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65 : tree_expression (l, c), m_expr (e), m_args (0), m_type (), |
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66 m_arg_nm (), m_dyn_field (), m_word_list_cmd (false) |
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67 { |
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68 append (n); |
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69 } |
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71 tree_index_expression::tree_index_expression (tree_expression *e, |
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72 tree_expression *df, |
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73 int l, int c) |
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74 : tree_expression (l, c), m_expr (e), m_args (0), m_type (), |
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75 m_arg_nm (), m_dyn_field (), m_word_list_cmd (false) |
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76 { |
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77 append (df); |
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78 } |
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80 tree_index_expression * |
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81 tree_index_expression::append (tree_argument_list *lst, char t) |
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82 { |
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83 m_args.push_back (lst); |
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84 m_type.append (1, t); |
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85 m_arg_nm.push_back (lst ? lst->get_arg_names () : string_vector ()); |
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86 m_dyn_field.push_back (static_cast<tree_expression *> (nullptr)); |
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87 |
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88 if (lst && lst->has_magic_tilde ()) |
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89 error ("invalid use of empty argument (~) in index expression"); |
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90 |
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91 return this; |
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92 } |
13970 | 93 |
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94 tree_index_expression * |
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95 tree_index_expression::append (const std::string& n) |
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96 { |
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97 m_args.push_back (static_cast<tree_argument_list *> (nullptr)); |
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98 m_type += '.'; |
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99 m_arg_nm.push_back (n); |
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100 m_dyn_field.push_back (static_cast<tree_expression *> (nullptr)); |
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101 |
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102 return this; |
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103 } |
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104 |
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105 tree_index_expression * |
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106 tree_index_expression::append (tree_expression *df) |
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107 { |
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108 m_args.push_back (static_cast<tree_argument_list *> (nullptr)); |
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109 m_type += '.'; |
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110 m_arg_nm.push_back (""); |
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111 m_dyn_field.push_back (df); |
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112 |
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113 return this; |
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114 } |
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115 |
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116 tree_index_expression::~tree_index_expression (void) |
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117 { |
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118 delete m_expr; |
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119 |
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120 while (! m_args.empty ()) |
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121 { |
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122 auto p = m_args.begin (); |
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123 delete *p; |
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124 m_args.erase (p); |
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125 } |
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127 while (! m_dyn_field.empty ()) |
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128 { |
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129 auto p = m_dyn_field.begin (); |
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130 delete *p; |
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131 m_dyn_field.erase (p); |
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132 } |
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133 } |
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135 // This is useful for printing the name of the variable in an indexed |
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136 // assignment. |
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138 std::string |
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139 tree_index_expression::name (void) const |
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140 { |
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141 return m_expr->name (); |
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142 } |
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144 std::string |
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145 tree_index_expression::get_struct_index |
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146 (tree_evaluator& tw, |
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147 std::list<string_vector>::const_iterator p_arg_nm, |
4219 | 148 std::list<tree_expression *>::const_iterator p_dyn_field) const |
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149 { |
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150 std::string fn = (*p_arg_nm)(0); |
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152 if (fn.empty ()) |
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153 { |
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154 tree_expression *df = *p_dyn_field; |
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156 if (df) |
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157 { |
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158 octave_value t = df->evaluate (tw); |
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160 fn = t.xstring_value ("dynamic structure field names must be strings"); |
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161 } |
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162 else |
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163 panic_impossible (); |
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164 } |
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166 return fn; |
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167 } |
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168 |
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169 octave_lvalue |
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170 tree_index_expression::lvalue (tree_evaluator& tw) |
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171 { |
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172 std::list<octave_value_list> idx; |
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173 |
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174 int n = m_args.size (); |
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175 |
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176 auto p_args = m_args.begin (); |
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177 auto p_arg_nm = m_arg_nm.begin (); |
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178 auto p_dyn_field = m_dyn_field.begin (); |
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179 |
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180 octave_lvalue retval = m_expr->lvalue (tw); |
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181 |
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182 unwind_action |
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183 act ([&tw] (const octave_value& val, |
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184 const std::string& index_type, |
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185 const std::list<octave_value_list>& index_list) |
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186 { |
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187 tw.set_indexed_object (val); |
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188 tw.set_index_list (index_type, index_list); |
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189 }, tw.indexed_object (), tw.index_type (), tw.index_list ()); |
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190 |
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191 tw.set_indexed_object (retval.value ()); |
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192 tw.clear_index_list (); |
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193 |
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194 for (int i = 0; i < n; i++) |
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195 { |
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196 switch (m_type[i]) |
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197 { |
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198 case '(': |
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199 { |
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200 octave_value_list tidx = tw.make_value_list (*p_args, *p_arg_nm); |
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202 tw.append_index_list ('(', tidx); |
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203 idx.push_back (tidx); |
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204 } |
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205 break; |
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207 case '{': |
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208 { |
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209 octave_value_list tidx = tw.make_value_list (*p_args, *p_arg_nm); |
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210 |
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211 tw.append_index_list ('{', tidx); |
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212 idx.push_back (tidx); |
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213 } |
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214 break; |
2980 | 215 |
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216 case '.': |
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217 { |
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218 octave_value tidx = get_struct_index (tw, p_arg_nm, p_dyn_field); |
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219 |
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220 tw.append_index_list ('.', tidx); |
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221 idx.push_back (tidx); |
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222 } |
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223 break; |
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224 |
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225 default: |
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226 panic_impossible (); |
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227 } |
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228 |
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229 if (idx.back ().empty ()) |
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230 error ("invalid empty index list"); |
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232 p_args++; |
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233 p_arg_nm++; |
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234 p_dyn_field++; |
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235 } |
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236 |
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237 retval.set_index (m_type, idx); |
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238 |
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239 return retval; |
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240 } |
4234 | 241 |
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242 tree_index_expression * |
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243 tree_index_expression::dup (symbol_scope& scope) const |
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244 { |
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245 tree_index_expression *new_idx_expr |
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246 = new tree_index_expression (line (), column ()); |
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247 |
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248 new_idx_expr->m_expr = (m_expr ? m_expr->dup (scope) : nullptr); |
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249 |
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250 std::list<tree_argument_list *> new_args; |
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252 for (const tree_argument_list *elt : m_args) |
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253 new_args.push_back (elt ? elt->dup (scope) : nullptr); |
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254 |
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255 new_idx_expr->m_args = new_args; |
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257 new_idx_expr->m_type = m_type; |
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258 |
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259 new_idx_expr->m_arg_nm = m_arg_nm; |
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261 std::list<tree_expression *> new_dyn_field; |
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262 |
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263 for (const tree_expression *elt : m_dyn_field) |
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264 new_dyn_field.push_back (elt ? elt->dup (scope) : nullptr); |
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265 |
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266 new_idx_expr->m_dyn_field = new_dyn_field; |
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267 |
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268 new_idx_expr->copy_base (*this); |
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270 return new_idx_expr; |
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271 } |
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272 |
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273 // Unlike Matlab, which does not allow the result of a function call |
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274 // or array indexing expression to be further indexed, Octave attempts |
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275 // to handle arbitrary index expressions. For example, Octave allows |
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276 // expressions like |
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277 // |
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278 // svd (rand (10))(1:5) |
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279 // |
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280 // Although octave_value objects may contain function objects, no |
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281 // indexing operation or function call is supposed to return them |
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282 // directly. Instead, the language is supposed to only allow function |
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283 // objects to be stored as function handles (named or anonymous) or as |
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284 // inline functions. The only place a function object should appear |
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285 // directly is if the symbol stored in a tree_identifier object |
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286 // resolves to a function. This means that the only place we need to |
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287 // look for functions is in the first element of the index |
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288 // expression. |
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289 // |
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290 // Steps: |
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291 // |
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292 // * Obtain the initial value from the expression component of the |
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293 // tree_index_expression object. If it is a tree_identifier object |
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294 // indexed by '(args)' and the identifier is not a variable, then |
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295 // perform a function call. Use the (optional) arguments to perform |
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296 // the function lookup so we choose the correct function or class |
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297 // method to call. Otherwise, evaluate the first expression |
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298 // without any additional arguments. |
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299 // |
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300 // * Iterate over the remaining elements of the index expression and |
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301 // call the octave_value::subsref method. If indexing a class or |
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302 // classdef object, build up a list of indices for a call to the |
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303 // subsref method for the object. Otherwise, use the result of |
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304 // each temporary evaluation for the next index element. |
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305 // |
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306 // * If not indexing a class or classdef object and any partial |
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307 // expression evaluation produces a class or classdef object, then |
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308 // build up a complete argument list from that point on for a final |
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309 // subsref call for that object. |
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310 // |
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311 // Multiple partial evaluations may be required. For example, |
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312 // given a class or classdef object X, then for the expression |
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313 // |
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314 // x.a{end}(2:end).b |
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315 // |
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316 // we must evaluate x.a to obtain the size for the first {end} |
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317 // expression, then we must evaluate x.a{end} to obtain the size |
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318 // for the second (2:end) expression. Finally, the complete |
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319 // expression may be evaluated. |
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320 // |
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321 // If X is a cell array in the above expression, and none of the |
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322 // intermediate evaluations produces a class or classdef object, |
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323 // then the evaluation is performed as the following series of |
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324 // steps |
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325 // |
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326 // tmp = x.a |
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327 // tmp = tmp{end} |
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328 // tmp = tmp(2:end) |
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329 // result = tmp.b |
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330 // |
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331 // If any of the partial evaluations produces a class or classdef |
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332 // object, then the subsref method for that object is called as |
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333 // described above. For example, suppose x.a produces a classdef |
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334 // object. Then the evaluation is performed as the following |
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335 // series of steps |
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336 // |
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337 // base_expr = tmp = x.a |
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338 // tmp = base_expr{end} |
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339 // base_expr{end}(2:end).b |
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340 // |
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341 // In the last two steps, the partial value computed in the |
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342 // previous step is used to determine the value of END. |
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343 |
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344 octave_value_list |
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345 tree_index_expression::evaluate_n (tree_evaluator& tw, int nargout) |
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346 { |
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347 octave_value_list retval; |
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348 |
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349 panic_if (m_args.empty ()); |
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350 |
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351 auto p_args = m_args.begin (); |
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352 auto p_arg_nm = m_arg_nm.begin (); |
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353 auto p_dyn_field = m_dyn_field.begin (); |
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354 |
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355 int n = m_args.size (); |
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356 int beg = 0; |
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357 |
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358 octave_value base_expr_val; |
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359 |
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360 if (m_expr->is_identifier () && m_type[beg] == '(') |
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361 { |
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362 tree_identifier *id = dynamic_cast<tree_identifier *> (m_expr); |
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363 |
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364 bool is_var = tw.is_variable (m_expr); |
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365 |
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366 std::string nm = id->name (); |
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367 |
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368 if (is_var && is_word_list_cmd ()) |
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369 { |
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370 bool maybe_binary_op = false; |
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371 if ((*p_args) && (*p_args)->length () > 0) |
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372 { |
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373 // check if first character of first argument might be (the |
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374 // start of) a binary operator |
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375 std::string ops = "+-*/\\.^|&"; |
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376 string_vector arg_list = (*p_args)->get_arg_names (); |
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377 if (! arg_list.isempty () |
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378 && (ops.find (arg_list(0)[1]) != std::string::npos)) |
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379 maybe_binary_op = true; |
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380 } |
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381 |
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382 std::string advice; |
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383 if (maybe_binary_op) |
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384 advice = "\nCheck whitespace around potential binary operator."; |
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385 |
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386 error ("variable \"%s\" used as function in command style expression%s", |
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387 nm.c_str (), advice.c_str ()); |
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388 } |
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389 |
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390 if (! is_var) |
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391 { |
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392 octave_value_list first_args; |
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393 |
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394 tree_argument_list *al = *p_args; |
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395 |
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396 if (al && al->length () > 0) |
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397 { |
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398 unwind_action act ([&tw] (const std::list<octave_lvalue> *lvl) |
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399 { |
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400 tw.set_lvalue_list (lvl); |
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401 }, tw.lvalue_list ()); |
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402 |
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403 tw.set_lvalue_list (nullptr); |
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404 |
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405 string_vector anm = *p_arg_nm; |
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406 |
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407 first_args = tw.convert_to_const_vector (al); |
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408 |
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409 first_args.stash_name_tags (anm); |
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410 } |
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411 |
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412 interpreter& interp = tw.get_interpreter (); |
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413 |
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414 symbol_table& symtab = interp.get_symbol_table (); |
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415 |
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416 octave_value val = symtab.find_function (nm, first_args); |
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417 |
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418 octave_function *fcn = nullptr; |
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419 |
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420 if (val.is_function ()) |
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421 fcn = val.function_value (true); |
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422 |
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423 if (fcn) |
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424 { |
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425 try |
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426 { |
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427 retval = fcn->call (tw, nargout, first_args); |
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428 } |
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429 catch (index_exception& ie) |
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430 { |
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431 tw.final_index_error (ie, m_expr); |
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432 } |
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433 |
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434 beg++; |
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435 p_args++; |
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436 p_arg_nm++; |
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437 p_dyn_field++; |
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438 |
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439 if (n > beg) |
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440 { |
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441 // More indices to follow. Silently ignore |
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442 // extra output values. |
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443 |
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444 if (retval.length () == 0) |
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445 error ("indexing undefined value"); |
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446 else |
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447 base_expr_val = retval(0); |
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448 } |
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449 else |
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450 { |
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451 // No more indices, so we are done. |
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452 |
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453 // See note at end of function about deleting |
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454 // temporaries prior to pushing result. |
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455 |
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456 base_expr_val = octave_value (); |
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457 first_args = octave_value_list (); |
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458 |
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459 return retval; |
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460 } |
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461 } |
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462 } |
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463 } |
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464 |
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465 if (base_expr_val.is_undefined ()) |
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466 base_expr_val = m_expr->evaluate (tw); |
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467 |
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468 // If we are indexing an object or looking at something like |
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469 // |
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470 // classname.static_function (args, ...); |
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471 // |
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472 // then we'll just build a complete index list for one big subsref |
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473 // call. If the expression we are indexing is a classname then |
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474 // base_expr_val will be an octave_classdef_meta object. If we have |
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475 // files in a +packagename folder, they will also be an |
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476 // octave_classdef_meta object, but we don't want to index them. |
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477 |
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478 std::list<octave_value_list> idx_list; |
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479 |
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480 { |
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481 // Note: need new scope so that the following unwind action will |
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482 // happen before we perform the final indexing for objects (for |
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483 // example). |
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484 |
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485 unwind_action |
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486 act ([&tw] (const octave_value& val, |
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487 const std::string& index_type, |
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488 const std::list<octave_value_list>& index_list) |
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489 { |
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490 tw.set_indexed_object (val); |
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491 tw.set_index_list (index_type, index_list); |
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492 }, |
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493 tw.indexed_object (), |
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494 tw.index_type (), tw.index_list ()); |
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495 |
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496 tw.set_indexed_object (); |
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497 tw.clear_index_list (); |
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498 |
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499 bool indexing_object = (base_expr_val.isobject () |
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500 || base_expr_val.isjava () |
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501 || (base_expr_val.is_classdef_meta () |
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502 && ! base_expr_val.is_package ())); |
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503 |
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504 octave_value partial_expr_val = base_expr_val; |
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505 |
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506 for (int i = beg; i < n; i++) |
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507 { |
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508 if (i > beg) |
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509 { |
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510 if (! indexing_object) |
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511 { |
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512 // Evaluate what we have so far. |
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513 |
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514 try |
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515 { |
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516 // Silently ignore extra output values. |
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517 |
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518 octave_value_list tmp_list |
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519 = base_expr_val.subsref (m_type.substr (beg, i-beg), |
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520 idx_list, nargout); |
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521 |
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522 partial_expr_val |
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523 = tmp_list.length () ? tmp_list(0) : octave_value (); |
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524 |
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525 base_expr_val = partial_expr_val; |
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526 |
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527 if (partial_expr_val.is_cs_list ()) |
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528 err_indexed_cs_list (); |
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529 |
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530 retval = partial_expr_val; |
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531 |
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532 beg = i; |
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533 idx_list.clear (); |
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534 tw.clear_index_list (); |
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535 |
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536 if (partial_expr_val.isobject () |
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537 || partial_expr_val.isjava () |
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538 || (partial_expr_val.is_classdef_meta () |
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539 && ! partial_expr_val.is_package ())) |
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540 { |
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541 // Found an object, so now we'll build up |
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542 // complete index list for one big subsref |
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543 // call from this point on. |
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544 |
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545 // FIXME: is is also possible to have a |
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546 // static method call buried somewhere in |
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547 // the depths of a complex indexing |
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548 // expression so that we would also need to |
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549 // check for an octave_classdef_meta object |
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550 // here? |
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551 |
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552 indexing_object = true; |
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553 } |
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554 } |
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555 catch (index_exception& ie) |
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556 { |
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557 tw.final_index_error (ie, m_expr); |
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558 } |
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559 } |
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560 } |
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561 |
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562 tw.set_indexed_object (partial_expr_val); |
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563 |
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564 switch (m_type[i]) |
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565 { |
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566 case '(': |
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567 { |
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568 octave_value_list tmp = tw.make_value_list (*p_args, *p_arg_nm); |
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569 tw.append_index_list ('(', tmp); |
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570 idx_list.push_back (tmp); |
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571 } |
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572 break; |
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573 |
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574 case '{': |
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575 { |
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576 octave_value_list tmp = tw.make_value_list (*p_args, *p_arg_nm); |
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577 tw.append_index_list ('{', tmp); |
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578 idx_list.push_back (tmp); |
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579 } |
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580 break; |
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581 |
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582 case '.': |
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583 { |
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584 octave_value tmp = get_struct_index (tw, p_arg_nm, p_dyn_field); |
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585 tw.append_index_list ('.', tmp); |
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586 idx_list.push_back (tmp); |
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587 } |
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588 break; |
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589 |
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590 default: |
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591 panic_impossible (); |
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592 } |
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593 |
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594 p_args++; |
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595 p_arg_nm++; |
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596 p_dyn_field++; |
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597 } |
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598 } |
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599 |
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600 // If ! idx_list.empty () that means we still have stuff to index |
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601 // otherwise they would have been dealt with and idx_list would have |
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602 // been emptied. |
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603 if (! idx_list.empty ()) |
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604 { |
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605 // This is for +package and other classdef_meta objects |
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606 if (! base_expr_val.is_function () |
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607 || base_expr_val.is_classdef_meta ()) |
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608 { |
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609 try |
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610 { |
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611 retval = base_expr_val.subsref (m_type.substr (beg, n-beg), |
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612 idx_list, nargout); |
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613 beg = n; |
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614 idx_list.clear (); |
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615 } |
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616 catch (index_exception& ie) |
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617 { |
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618 tw.final_index_error (ie, m_expr); |
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619 } |
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620 } |
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621 else |
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622 { |
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623 // FIXME: we want this to only be a superclass constructor |
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624 // call Should we actually make a check for this or are all |
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625 // other types of calls already dealt with? |
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626 |
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627 octave_function *fcn = base_expr_val.function_value (); |
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628 |
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629 if (fcn) |
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630 { |
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631 try |
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632 { |
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633 // FIXME: is it possible for the IDX_LIST to have |
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634 // more than one element here? Do we need to check? |
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635 |
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636 octave_value_list final_args; |
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637 |
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638 if (idx_list.size () != 1) |
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639 error ("unexpected extra index at end of expression"); |
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640 |
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641 if (m_type[beg] != '(') |
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642 error ("invalid index type '%c' for function call", |
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643 m_type[beg]); |
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644 |
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645 final_args = idx_list.front (); |
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646 |
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647 // FIXME: Do we ever need the names of the arguments |
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648 // passed to FCN here? |
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649 |
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650 retval = fcn->call (tw, nargout, final_args); |
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651 } |
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652 catch (index_exception& ie) |
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653 { |
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654 tw.final_index_error (ie, m_expr); |
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655 } |
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656 } |
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657 } |
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658 } |
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659 |
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660 // FIXME: when can the following happen? In what case does indexing |
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661 // result in a value that is a function? Classdef method calls? |
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662 // Something else? |
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663 |
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664 octave_value val = (retval.length () ? retval(0) : octave_value ()); |
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665 |
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666 if (val.is_function ()) |
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667 { |
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668 octave_function *fcn = val.function_value (true); |
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669 |
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670 if (fcn) |
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671 { |
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672 octave_value_list final_args; |
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673 |
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674 if (! idx_list.empty ()) |
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675 { |
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676 if (n - beg != 1) |
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677 error ("unexpected extra index at end of expression"); |
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678 |
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679 if (m_type[beg] != '(') |
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680 error ("invalid index type '%c' for function call", |
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681 m_type[beg]); |
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682 |
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683 final_args = idx_list.front (); |
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684 } |
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685 |
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686 retval = fcn->call (tw, nargout, final_args); |
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687 } |
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688 } |
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689 |
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690 // Delete any temporary values prior to returning so that |
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691 // destructors for any temporary classdef handle objects will be |
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692 // called before we return. |
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693 |
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694 idx_list.clear (); |
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695 base_expr_val = octave_value (); |
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696 val = octave_value (); |
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697 |
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698 return retval; |
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699 } |
2980 | 700 } |
701 | |
7099 | 702 /* |
703 %!test | |
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704 %! clear x; |
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705 %! clear y; |
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706 %! y = 3; |
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707 %! x(y(end)) = 1; |
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708 %! assert (x, [0, 0, 1]); |
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709 %! clear x; |
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710 %! clear y; |
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711 %! y = {3}; |
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712 %! x(y{end}) = 1; |
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713 %! assert (x, [0, 0, 1]); |
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714 |
acc26b860afa
fix indexed assignment bug (bug #35482)
John W. Eaton <jwe@octave.org>
parents:
14138
diff
changeset
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715 %!test |
7099 | 716 %! x = {1, 2, 3}; |
717 %! [x{:}] = deal (4, 5, 6); | |
718 %! assert (x, {4, 5, 6}); | |
719 | |
720 %!test | |
721 %! [x.a, x.b.c] = deal (1, 2); | |
722 %! assert (x.a == 1 && x.b.c == 2); | |
723 | |
724 %!test | |
725 %! [x.a, x(2).b] = deal (1, 2); | |
726 %! assert (x(1).a == 1 && isempty (x(2).a) && isempty (x(1).b) && x(2).b == 2); | |
727 | |
728 %!test | |
729 %! x = struct (zeros (0, 1), {"a", "b"}); | |
730 %! x(2).b = 1; | |
731 %! assert (x(2).b == 1); | |
732 | |
733 %!test | |
734 %! x = struct (zeros (0, 1), {"a", "b"}); | |
735 %! x(2).b = 1; | |
736 %! assert (x(2).b == 1); | |
737 */ |