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[project @ 1997-05-16 01:12:13 by jwe]
author jwe
date Fri, 16 May 1997 01:13:19 +0000
parents
children 20f5cec4f11c
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2979:a3556d2adec9 2980:cd5ad3fd8049
1 /*
2
3 Copyright (C) 1996, 1997 John W. Eaton
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
23 #if defined (__GNUG__)
24 #pragma implementation
25 #endif
26
27 #ifdef HAVE_CONFIG_H
28 #include <config.h>
29 #endif
30
31 #include "error.h"
32 #include "oct-obj.h"
33 #include "ov.h"
34 #include "pt-binop.h"
35 #include "pt-pr-code.h"
36 #include "pt-walk.h"
37
38 // Binary expressions.
39
40 octave_value_list
41 tree_binary_expression::rvalue (int nargout)
42 {
43 octave_value_list retval;
44
45 if (nargout > 1)
46 error ("binary operator `%s': invalid number of output arguments",
47 oper () . c_str ());
48 else
49 retval = rvalue ();
50
51 return retval;
52 }
53
54 octave_value
55 tree_binary_expression::rvalue (void)
56 {
57 octave_value retval;
58
59 if (error_state)
60 return retval;
61
62 if (op_lhs)
63 {
64 octave_value a = op_lhs->rvalue ();
65
66 if (error_state)
67 eval_error ();
68 else if (a.is_defined () && op_rhs)
69 {
70 octave_value b = op_rhs->rvalue ();
71
72 if (error_state)
73 eval_error ();
74 else if (b.is_defined ())
75 {
76 retval = ::do_binary_op (etype, a, b);
77
78 if (error_state)
79 {
80 retval = octave_value ();
81 eval_error ();
82 }
83 }
84 else
85 eval_error ();
86 }
87 else
88 eval_error ();
89 }
90 else
91 eval_error ();
92
93 return retval;
94 }
95
96 void
97 tree_binary_expression::eval_error (void)
98 {
99 if (error_state > 0)
100 ::error ("evaluating binary operator `%s' near line %d, column %d",
101 oper () . c_str (), line (), column ());
102 }
103
104 string
105 tree_binary_expression::oper (void) const
106 {
107 return octave_value::binary_op_as_string (etype);
108 }
109
110 void
111 tree_binary_expression::accept (tree_walker& tw)
112 {
113 tw.visit_binary_expression (*this);
114 }
115
116 // Boolean expressions.
117
118 octave_value_list
119 tree_boolean_expression::rvalue (int nargout)
120 {
121 octave_value_list retval;
122
123 if (nargout > 1)
124 error ("binary operator `%s': invalid number of output arguments",
125 oper () . c_str ());
126 else
127 retval = rvalue ();
128
129 return retval;
130 }
131
132 octave_value
133 tree_boolean_expression::rvalue (void)
134 {
135 octave_value retval;
136
137 if (error_state)
138 return retval;
139
140 bool result = false;
141
142 if (op_lhs)
143 {
144 octave_value a = op_lhs->rvalue ();
145
146 if (error_state)
147 eval_error ();
148 else
149 {
150 bool a_true = a.is_true ();
151
152 if (error_state)
153 eval_error ();
154 else
155 {
156 if (a_true)
157 {
158 if (etype == bool_or)
159 {
160 result = true;
161 goto done;
162 }
163 }
164 else
165 {
166 if (etype == bool_and)
167 goto done;
168 }
169
170 if (op_rhs)
171 {
172 octave_value b = op_rhs->rvalue ();
173
174 if (error_state)
175 eval_error ();
176 else
177 {
178 result = b.is_true ();
179
180 if (error_state)
181 eval_error ();
182 }
183 }
184 else
185 eval_error ();
186
187 done:
188
189 if (! error_state)
190 retval = octave_value (static_cast<double> (result));
191 }
192 }
193 }
194 else
195 eval_error ();
196
197 return retval;
198 }
199
200 string
201 tree_boolean_expression::oper (void) const
202 {
203 string retval = "<unknown>";
204
205 switch (etype)
206 {
207 case bool_and:
208 retval = "&&";
209 break;
210
211 case bool_or:
212 retval = "||";
213 break;
214
215 default:
216 break;
217 }
218
219 return retval;
220 }
221
222 /*
223 ;;; Local Variables: ***
224 ;;; mode: C++ ***
225 ;;; End: ***
226 */