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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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23 #if !defined (octave_tree_expr_h) |
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24 #define octave_tree_expr_h 1 |
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25 |
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26 #if defined (__GNUG__) |
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27 #pragma interface |
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28 #endif |
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29 |
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30 #include <string> |
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31 |
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32 class octave_value; |
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33 class octave_variable_reference; |
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34 |
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35 #include "pt-base.h" |
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36 |
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37 // A base class for expressions. |
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38 |
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39 class |
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40 tree_expression : public tree |
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41 { |
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42 public: |
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43 |
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44 tree_expression (int l = -1, int c = -1) |
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45 : tree (l, c), num_parens (0) { } |
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46 |
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47 virtual ~tree_expression (void) { } |
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48 |
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49 virtual bool is_constant (void) const |
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50 { return false; } |
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51 |
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52 virtual bool is_matrix_constant (void) const |
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53 { return false; } |
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54 |
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55 virtual bool is_multi_val_ret_expression (void) const |
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56 { return false; } |
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57 |
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58 virtual bool is_identifier (void) const |
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59 { return false; } |
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60 |
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61 virtual bool is_indirect_ref (void) const |
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62 { return false; } |
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63 |
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64 virtual bool is_index_expression (void) const |
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65 { return false; } |
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66 |
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67 virtual bool is_assignment_expression (void) const |
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68 { return false; } |
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69 |
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70 virtual bool is_prefix_expression (void) const |
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71 { return false; } |
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72 |
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73 virtual bool is_logically_true (const char *); |
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74 |
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75 virtual int paren_count (void) const |
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76 { return num_parens; } |
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77 |
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78 virtual void mark_for_possible_ans_assign (void); |
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79 |
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80 virtual octave_value eval (bool print = false) = 0; |
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81 |
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82 virtual octave_variable_reference reference (void); |
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83 |
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84 virtual string oper (void) const |
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85 { return "<unknown>"; } |
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86 |
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87 virtual string original_text (void) const; |
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88 |
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89 tree_expression *mark_in_parens (void) |
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90 { |
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91 num_parens++; |
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92 return this; |
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93 } |
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94 |
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95 protected: |
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96 |
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97 // A count of the number of times this expression appears directly |
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98 // inside a set of parentheses. |
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99 // |
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100 // (((e1)) + e2) ==> 2 for expression e1 |
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101 // ==> 1 for expression ((e1)) + e2 |
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102 // ==> 0 for expression e2 |
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103 int num_parens; |
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104 }; |
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105 |
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106 #endif |
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107 |
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108 /* |
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109 ;;; Local Variables: *** |
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110 ;;; mode: C++ *** |
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111 ;;; End: *** |
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112 */ |
