Mercurial > octave
annotate libinterp/parse-tree/pt-assign.h @ 23458:0f4ed33886de
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author | John W. Eaton <jwe@octave.org> |
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date | Fri, 28 Apr 2017 16:40:17 -0400 |
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rev | line source |
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2980 | 1 /* |
2 | |
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3 Copyright (C) 1996-2017 John W. Eaton |
2980 | 4 |
5 This file is part of Octave. | |
6 | |
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. |
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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 |
19 <http://www.gnu.org/licenses/>. | |
2980 | 20 |
21 */ | |
22 | |
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23 #if ! defined (octave_pt_assign_h) |
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24 #define octave_pt_assign_h 1 |
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26 #include "octave-config.h" |
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27 |
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28 #include <iosfwd> |
2980 | 29 #include <string> |
30 | |
31 class octave_value; | |
32 class octave_value_list; | |
33 class octave_lvalue; | |
34 | |
35 #include "ov.h" | |
36 #include "pt-exp.h" | |
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37 #include "pt-walk.h" |
7336 | 38 #include "symtab.h" |
2980 | 39 |
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40 namespace octave |
2980 | 41 { |
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42 class tree_argument_list; |
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43 |
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44 // Simple assignment expressions. |
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45 |
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46 class tree_simple_assignment : public tree_expression |
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47 { |
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48 public: |
2980 | 49 |
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50 tree_simple_assignment (bool plhs = false, int l = -1, int c = -1, |
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51 octave_value::assign_op t = octave_value::op_asn_eq) |
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52 : tree_expression (l, c), lhs (0), rhs (0), preserve (plhs), ans_ass (), |
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53 etype (t) { } |
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55 tree_simple_assignment (tree_expression *le, tree_expression *re, |
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56 bool plhs = false, int l = -1, int c = -1, |
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57 octave_value::assign_op t = octave_value::op_asn_eq); |
4267 | 58 |
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59 // No copying! |
2980 | 60 |
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61 tree_simple_assignment (const tree_simple_assignment&) = delete; |
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62 |
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63 tree_simple_assignment& operator = (const tree_simple_assignment&) = delete; |
2980 | 64 |
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65 ~tree_simple_assignment (void); |
2980 | 66 |
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67 bool has_magic_end (void) const { return (rhs && rhs->has_magic_end ()); } |
2980 | 68 |
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69 bool rvalue_ok (void) const { return true; } |
2980 | 70 |
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71 bool is_assignment_expression (void) const { return true; } |
2980 | 72 |
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73 std::string oper (void) const; |
5861 | 74 |
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75 tree_expression * left_hand_side (void) { return lhs; } |
2980 | 76 |
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77 tree_expression * right_hand_side (void) { return rhs; } |
7087 | 78 |
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79 tree_expression * dup (symbol_table::scope_id scope, |
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80 symbol_table::context_id context) const; |
2980 | 81 |
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82 void accept (tree_walker& tw) |
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83 { |
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84 tw.visit_simple_assignment (*this); |
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85 } |
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86 |
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87 octave_value::assign_op op_type (void) const { return etype; } |
7087 | 88 |
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89 private: |
2980 | 90 |
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91 void do_assign (octave_lvalue& ult, const octave_value_list& args, |
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92 const octave_value& rhs_val); |
2980 | 93 |
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94 void do_assign (octave_lvalue& ult, const octave_value& rhs_val); |
2980 | 95 |
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96 // The left hand side of the assignment. |
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97 tree_expression *lhs; |
2980 | 98 |
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99 // The right hand side of the assignment. |
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100 tree_expression *rhs; |
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102 // True if we should not delete the lhs. |
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103 bool preserve; |
2988 | 104 |
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105 // True if this is an assignment to the automatic variable ans. |
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106 bool ans_ass; |
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108 // The type of the expression. |
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109 octave_value::assign_op etype; |
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110 }; |
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112 // Multi-valued assignment expressions. |
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114 class tree_multi_assignment : public tree_expression |
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115 { |
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116 public: |
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117 |
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118 tree_multi_assignment (bool plhs = false, int l = -1, int c = -1) |
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119 : tree_expression (l, c), lhs (0), rhs (0), preserve (plhs) { } |
2980 | 120 |
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121 tree_multi_assignment (tree_argument_list *lst, tree_expression *r, |
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122 bool plhs = false, int l = -1, int c = -1); |
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124 // No copying! |
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126 tree_multi_assignment (const tree_multi_assignment&) = delete; |
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127 |
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128 tree_multi_assignment& operator = (const tree_multi_assignment&) = delete; |
2980 | 129 |
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130 ~tree_multi_assignment (void); |
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132 bool has_magic_end (void) const { return (rhs && rhs->has_magic_end ()); } |
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134 bool is_assignment_expression (void) const { return true; } |
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136 bool rvalue_ok (void) const { return true; } |
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138 std::string oper (void) const; |
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140 tree_argument_list * left_hand_side (void) { return lhs; } |
2980 | 141 |
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142 tree_expression * right_hand_side (void) { return rhs; } |
2980 | 143 |
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144 tree_expression * dup (symbol_table::scope_id scope, |
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145 symbol_table::context_id context) const; |
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147 void accept (tree_walker& tw) |
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148 { |
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149 tw.visit_multi_assignment (*this); |
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150 } |
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151 |
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152 octave_value::assign_op op_type (void) const |
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153 { return octave_value::op_asn_eq; } |
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155 private: |
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157 // The left hand side of the assignment. |
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158 tree_argument_list *lhs; |
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160 // The right hand side of the assignment. |
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161 tree_expression *rhs; |
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163 // True if we should not delete the lhs. |
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164 bool preserve; |
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165 }; |
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166 } |
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168 #if defined (OCTAVE_USE_DEPRECATED_FUNCTIONS) |
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170 OCTAVE_DEPRECATED ("use 'octave::tree_simple_assignment' instead") |
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171 typedef octave::tree_simple_assignment tree_simple_assignment; |
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172 |
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173 OCTAVE_DEPRECATED ("use 'octave::tree_multi_assignment' instead") |
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174 typedef octave::tree_multi_assignment tree_multi_assignment; |
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176 #endif | |
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177 |
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178 #endif |