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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 "oct-lvalue.h"
34 #include "ov.h"
35 #include "pt-unop.h"
36 #include "pt-pr-code.h"
37 #include "pt-walk.h"
38
39 // Prefix expressions.
40
41 octave_value_list
42 tree_prefix_expression::rvalue (int nargout)
43 {
44 octave_value_list retval;
45
46 if (nargout > 1)
47 error ("prefix operator `%s': invalid number of output arguments",
48 oper () . c_str ());
49 else
50 retval = rvalue ();
51
52 return retval;
53 }
54
55 octave_value
56 tree_prefix_expression::rvalue (void)
57 {
58 octave_value retval;
59
60 if (error_state)
61 return retval;
62
63 if (op)
64 {
65 if (etype == unot || etype == uminus)
66 {
67 octave_value val = op->rvalue ();
68
69 if (! error_state)
70 {
71 if (val.is_defined ())
72 {
73 if (etype == unot)
74 retval = val.not ();
75 else
76 retval = val.uminus ();
77 }
78 else
79 error ("argument to prefix operator `%s' undefined",
80 oper () . c_str ());
81 }
82 }
83 else if (etype == increment || etype == decrement)
84 {
85 octave_lvalue ref = op->lvalue ();
86
87 if (! error_state)
88 {
89 if (ref.is_defined ())
90 {
91 if (etype == increment)
92 ref.increment ();
93 else
94 ref.decrement ();
95
96 retval = ref.value ();
97 }
98 else
99 error ("argument to prefix operator `%s' undefined",
100 oper () . c_str ());
101 }
102 }
103 else
104 error ("prefix operator %d not implemented", etype);
105 }
106
107 return retval;
108 }
109
110 void
111 tree_prefix_expression::eval_error (void)
112 {
113 if (error_state > 0)
114 ::error ("evaluating prefix operator `%s' near line %d, column %d",
115 oper () . c_str (), line (), column ());
116 }
117
118 string
119 tree_prefix_expression::oper (void) const
120 {
121 string retval = "<unknown>";
122
123 switch (etype)
124 {
125 case unot:
126 retval = "!";
127 break;
128
129 case uminus:
130 retval = "-";
131 break;
132
133 case increment:
134 retval = "++";
135 break;
136
137 case decrement:
138 retval = "--";
139 break;
140
141 default:
142 break;
143 }
144
145 return retval;
146 }
147
148 void
149 tree_prefix_expression::accept (tree_walker& tw)
150 {
151 tw.visit_prefix_expression (*this);
152 }
153
154 // Postfix expressions.
155
156 octave_value_list
157 tree_postfix_expression::rvalue (int nargout)
158 {
159 octave_value_list retval;
160
161 if (nargout > 1)
162 error ("postfix operator `%s': invalid number of output arguments",
163 oper () . c_str ());
164 else
165 retval = rvalue ();
166
167 return retval;
168 }
169
170 octave_value
171 tree_postfix_expression::rvalue (void)
172 {
173 octave_value retval;
174
175 if (error_state)
176 return retval;
177
178 if (op)
179 {
180 if (etype == transpose || etype == hermitian)
181 {
182 octave_value val = op->rvalue ();
183
184 if (! error_state)
185 {
186 if (val.is_defined ())
187 {
188 if (etype == transpose)
189 retval = val.transpose ();
190 else
191 retval = val.hermitian ();
192 }
193 else
194 error ("argument to postfix operator `%s' undefined",
195 oper () . c_str ());
196 }
197 }
198 else if (etype == increment || etype == decrement)
199 {
200 octave_lvalue ref = op->lvalue ();
201
202 if (! error_state)
203 {
204 if (ref.is_defined ())
205 {
206 retval = ref.value ();
207
208 if (etype == increment)
209 ref.increment ();
210 else
211 ref.decrement ();
212 }
213 else
214 error ("argument to postfix operator `%s' undefined",
215 oper () . c_str ());
216 }
217 }
218 else
219 error ("postfix operator %d not implemented", etype);
220 }
221
222 return retval;
223 }
224
225 void
226 tree_postfix_expression::eval_error (void)
227 {
228 if (error_state > 0)
229 ::error ("evaluating postfix operator `%s' near line %d, column %d",
230 oper () . c_str (), line (), column ());
231 }
232
233 string
234 tree_postfix_expression::oper (void) const
235 {
236 string retval = "<unknown>";
237
238 switch (etype)
239 {
240 case transpose:
241 retval = ".'";
242 break;
243
244 case hermitian:
245 retval = "'";
246 break;
247
248 case increment:
249 retval = "++";
250 break;
251
252 case decrement:
253 retval = "--";
254 break;
255
256 default:
257 break;
258 }
259
260 return retval;
261 }
262
263 void
264 tree_postfix_expression::accept (tree_walker& tw)
265 {
266 tw.visit_postfix_expression (*this);
267 }
268
269 /*
270 ;;; Local Variables: ***
271 ;;; mode: C++ ***
272 ;;; End: ***
273 */