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annotate libinterp/parse-tree/pt-exp.h @ 19840:c5270263d466 gui-release
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| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Fri, 30 Jan 2015 17:41:50 -0500 |
| parents | d76f790b4eec |
| children | c7b68a11074b |
| rev | line source |
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| 1739 | 1 /* |
| 2 | |
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3 Copyright (C) 1996-2013 John W. Eaton |
| 1739 | 4 |
| 5 This file is part of Octave. | |
| 6 | |
| 7 Octave is free software; you can redistribute it and/or modify it | |
| 8 under the terms of the GNU General Public License as published by the | |
| 7016 | 9 Free Software Foundation; either version 3 of the License, or (at your |
| 10 option) any later version. | |
| 1739 | 11 |
| 12 Octave is distributed in the hope that it will be useful, but WITHOUT | |
| 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 15 for more details. | |
| 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/>. | |
| 1739 | 20 |
| 21 */ | |
| 22 | |
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23 #if !defined (octave_pt_exp_h) |
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24 #define octave_pt_exp_h 1 |
| 1739 | 25 |
| 2980 | 26 #include <string> |
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27 #include <list> |
| 2124 | 28 |
| 2879 | 29 class octave_value; |
| 2979 | 30 class octave_lvalue; |
| 2879 | 31 |
| 2988 | 32 #include "pt.h" |
| 7336 | 33 #include "symtab.h" |
| 2124 | 34 |
| 2980 | 35 // A base class for expressions. |
| 1739 | 36 |
| 37 class | |
| 2980 | 38 tree_expression : public tree |
| 2388 | 39 { |
| 40 public: | |
| 41 | |
| 2980 | 42 tree_expression (int l = -1, int c = -1) |
| 43 : tree (l, c), num_parens (0), postfix_indexed (false), | |
| 44 print_flag (false) { } | |
| 2388 | 45 |
| 2980 | 46 virtual ~tree_expression (void) { } |
| 2388 | 47 |
| 4267 | 48 virtual bool has_magic_end (void) const = 0; |
| 49 | |
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50 virtual tree_expression *dup (symbol_table::scope_id, |
| 10313 | 51 symbol_table::context_id context) const = 0; |
| 5861 | 52 |
| 3933 | 53 virtual bool is_constant (void) const { return false; } |
| 2388 | 54 |
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55 virtual bool is_matrix (void) const { return false; } |
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56 |
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57 virtual bool is_cell (void) const { return false; } |
| 2388 | 58 |
| 3933 | 59 virtual bool is_identifier (void) const { return false; } |
| 1739 | 60 |
| 3933 | 61 virtual bool is_index_expression (void) const { return false; } |
| 1739 | 62 |
| 3933 | 63 virtual bool is_assignment_expression (void) const { return false; } |
| 1739 | 64 |
| 3933 | 65 virtual bool is_prefix_expression (void) const { return false; } |
| 1739 | 66 |
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67 virtual bool is_unary_expression (void) const { return false; } |
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68 |
| 4023 | 69 virtual bool is_binary_expression (void) const { return false; } |
| 70 | |
| 71 virtual bool is_boolean_expression (void) const { return false; } | |
| 72 | |
| 2980 | 73 virtual bool is_logically_true (const char *); |
| 1739 | 74 |
| 3933 | 75 virtual bool lvalue_ok (void) const { return false; } |
| 1739 | 76 |
| 3933 | 77 virtual bool rvalue_ok (void) const { return false; } |
| 2124 | 78 |
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79 virtual octave_value rvalue1 (int nargout = 1); |
| 1739 | 80 |
| 2980 | 81 virtual octave_value_list rvalue (int nargout); |
| 2879 | 82 |
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83 virtual octave_value_list |
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84 rvalue (int nargout, const std::list<octave_lvalue> *lvalue_list); |
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85 |
| 2980 | 86 virtual octave_lvalue lvalue (void); |
| 2879 | 87 |
| 3933 | 88 int paren_count (void) const { return num_parens; } |
| 2124 | 89 |
| 3933 | 90 bool is_postfix_indexed (void) const { return postfix_indexed; } |
| 2124 | 91 |
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92 // Check if the result of the expression should be printed. |
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93 // Should normally be used in conjunction with |
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94 // tree_evaluator::statement_printing_enabled. |
| 3933 | 95 bool print_result (void) const { return print_flag; } |
| 1739 | 96 |
| 3933 | 97 virtual std::string oper (void) const { return "<unknown>"; } |
| 1739 | 98 |
| 3933 | 99 virtual std::string name (void) const { return "<unknown>"; } |
| 2124 | 100 |
| 3523 | 101 virtual std::string original_text (void) const; |
| 1739 | 102 |
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103 virtual void mark_braindead_shortcircuit (void) { } |
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104 |
| 2980 | 105 tree_expression *mark_in_parens (void) |
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106 { |
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107 num_parens++; |
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108 return this; |
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109 } |
| 1739 | 110 |
| 2980 | 111 tree_expression *mark_postfix_indexed (void) |
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112 { |
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113 postfix_indexed = true; |
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114 return this; |
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115 } |
| 2971 | 116 |
| 2980 | 117 tree_expression *set_print_flag (bool print) |
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118 { |
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119 print_flag = print; |
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120 return this; |
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121 } |
| 2971 | 122 |
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123 virtual void copy_base (const tree_expression& e) |
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124 { |
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125 num_parens = e.num_parens; |
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126 postfix_indexed = e.postfix_indexed; |
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127 print_flag = e.print_flag; |
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128 } |
| 5861 | 129 |
| 2980 | 130 protected: |
| 2971 | 131 |
| 2980 | 132 // A count of the number of times this expression appears directly |
| 133 // inside a set of parentheses. | |
| 134 // | |
| 135 // (((e1)) + e2) ==> 2 for expression e1 | |
| 136 // ==> 1 for expression ((e1)) + e2 | |
| 137 // ==> 0 for expression e2 | |
| 138 int num_parens; | |
| 2971 | 139 |
| 2980 | 140 // A flag that says whether this expression has an index associated |
| 141 // with it. See the code in tree_identifier::rvalue for the rationale. | |
| 142 bool postfix_indexed; | |
| 2971 | 143 |
| 2980 | 144 // Print result of rvalue for this expression? |
| 145 bool print_flag; | |
| 2988 | 146 |
| 147 private: | |
| 148 | |
| 149 // No copying! | |
| 150 | |
| 151 tree_expression (const tree_expression&); | |
| 152 | |
| 153 tree_expression& operator = (const tree_expression&); | |
| 2971 | 154 }; |
| 155 | |
| 1739 | 156 #endif |