|
1739
|
1 /* |
|
|
2 |
|
2847
|
3 Copyright (C) 1996, 1997 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 |
|
|
9 Free Software Foundation; either version 2, or (at your option) any |
|
|
10 later version. |
|
|
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 |
|
|
18 along with Octave; see the file COPYING. If not, write to the Free |
|
|
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
|
|
20 |
|
|
21 */ |
|
|
22 |
|
2980
|
23 #if !defined (octave_tree_expr_h) |
|
|
24 #define octave_tree_expr_h 1 |
|
1739
|
25 |
|
2980
|
26 #include <string> |
|
2124
|
27 |
|
2879
|
28 class octave_value; |
|
2979
|
29 class octave_lvalue; |
|
2879
|
30 |
|
2988
|
31 #include "pt.h" |
|
2124
|
32 |
|
2980
|
33 // A base class for expressions. |
|
1739
|
34 |
|
|
35 class |
|
2980
|
36 tree_expression : public tree |
|
2388
|
37 { |
|
|
38 public: |
|
|
39 |
|
2980
|
40 tree_expression (int l = -1, int c = -1) |
|
|
41 : tree (l, c), num_parens (0), postfix_indexed (false), |
|
|
42 print_flag (false) { } |
|
2388
|
43 |
|
2980
|
44 virtual ~tree_expression (void) { } |
|
2388
|
45 |
|
4267
|
46 virtual bool has_magic_end (void) const = 0; |
|
|
47 |
|
3933
|
48 virtual bool is_constant (void) const { return false; } |
|
2388
|
49 |
|
3933
|
50 virtual bool is_matrix_constant (void) const { return false; } |
|
2388
|
51 |
|
3933
|
52 virtual bool is_identifier (void) const { return false; } |
|
1739
|
53 |
|
3933
|
54 virtual bool is_index_expression (void) const { return false; } |
|
1739
|
55 |
|
3933
|
56 virtual bool is_assignment_expression (void) const { return false; } |
|
1739
|
57 |
|
3933
|
58 virtual bool is_prefix_expression (void) const { return false; } |
|
1739
|
59 |
|
4023
|
60 virtual bool is_binary_expression (void) const { return false; } |
|
|
61 |
|
|
62 virtual bool is_boolean_expression (void) const { return false; } |
|
|
63 |
|
2980
|
64 virtual bool is_logically_true (const char *); |
|
1739
|
65 |
|
3933
|
66 virtual bool lvalue_ok (void) const { return false; } |
|
1739
|
67 |
|
3933
|
68 virtual bool rvalue_ok (void) const { return false; } |
|
2124
|
69 |
|
2980
|
70 virtual octave_value rvalue (void); |
|
1739
|
71 |
|
2980
|
72 virtual octave_value_list rvalue (int nargout); |
|
2879
|
73 |
|
2980
|
74 virtual octave_lvalue lvalue (void); |
|
2879
|
75 |
|
3933
|
76 int paren_count (void) const { return num_parens; } |
|
2124
|
77 |
|
3933
|
78 bool is_postfix_indexed (void) const { return postfix_indexed; } |
|
2124
|
79 |
|
3933
|
80 bool print_result (void) const { return print_flag; } |
|
1739
|
81 |
|
3933
|
82 virtual std::string oper (void) const { return "<unknown>"; } |
|
1739
|
83 |
|
3933
|
84 virtual std::string name (void) const { return "<unknown>"; } |
|
2124
|
85 |
|
3523
|
86 virtual std::string original_text (void) const; |
|
1739
|
87 |
|
2980
|
88 tree_expression *mark_in_parens (void) |
|
1739
|
89 { |
|
2980
|
90 num_parens++; |
|
|
91 return this; |
|
1739
|
92 } |
|
|
93 |
|
2980
|
94 tree_expression *mark_postfix_indexed (void) |
|
|
95 { |
|
|
96 postfix_indexed = true; |
|
|
97 return this; |
|
|
98 } |
|
2971
|
99 |
|
2980
|
100 tree_expression *set_print_flag (bool print) |
|
|
101 { |
|
|
102 print_flag = print; |
|
|
103 return this; |
|
|
104 } |
|
2971
|
105 |
|
2980
|
106 protected: |
|
2971
|
107 |
|
2980
|
108 // A count of the number of times this expression appears directly |
|
|
109 // inside a set of parentheses. |
|
|
110 // |
|
|
111 // (((e1)) + e2) ==> 2 for expression e1 |
|
|
112 // ==> 1 for expression ((e1)) + e2 |
|
|
113 // ==> 0 for expression e2 |
|
|
114 int num_parens; |
|
2971
|
115 |
|
2980
|
116 // A flag that says whether this expression has an index associated |
|
|
117 // with it. See the code in tree_identifier::rvalue for the rationale. |
|
|
118 bool postfix_indexed; |
|
2971
|
119 |
|
2980
|
120 // Print result of rvalue for this expression? |
|
|
121 bool print_flag; |
|
2988
|
122 |
|
|
123 private: |
|
|
124 |
|
|
125 // No copying! |
|
|
126 |
|
|
127 tree_expression (const tree_expression&); |
|
|
128 |
|
|
129 tree_expression& operator = (const tree_expression&); |
|
2971
|
130 }; |
|
|
131 |
|
1739
|
132 #endif |
|
|
133 |
|
|
134 /* |
|
|
135 ;;; Local Variables: *** |
|
|
136 ;;; mode: C++ *** |
|
|
137 ;;; End: *** |
|
|
138 */ |
