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comparison src/ov-fcn-handle.cc @ 4343:db5e0814277a

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[project @ 2003-02-20 16:44:16 by jwe]
author jwe
date Thu, 20 Feb 2003 16:46:37 +0000
parents
children d39de791ef9c
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4342:813effe14ee1 4343:db5e0814277a
1 /*
2
3 Copyright (C) 2003 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__) && defined (USE_PRAGMA_INTERFACE_IMPLEMENTATION)
24 #pragma implementation
25 #endif
26
27 #ifdef HAVE_CONFIG_H
28 #include <config.h>
29 #endif
30
31 #include <iostream>
32
33 #include "defun.h"
34 #include "oct-map.h"
35 #include "ov-base.h"
36 #include "ov-fcn-handle.h"
37 #include "pr-output.h"
38 #include "variables.h"
39
40 DEFINE_OCTAVE_ALLOCATOR (octave_fcn_handle);
41
42 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_fcn_handle, "function handle");
43
44 void
45 octave_fcn_handle::print (std::ostream& os, bool pr_as_read_syntax) const
46 {
47 print_raw (os, pr_as_read_syntax);
48 newline (os);
49 }
50
51 void
52 octave_fcn_handle::print_raw (std::ostream& os, bool pr_as_read_syntax) const
53 {
54 indent (os);
55 os << "@" << name ();
56 }
57
58 octave_value
59 make_fcn_handle (const std::string& nm)
60 {
61 octave_value retval;
62
63 octave_function *f = lookup_function (nm);
64
65 if (f)
66 {
67 octave_fcn_handle fh (f, nm);
68
69 retval = octave_value (fh);
70 }
71 else
72 error ("error creating function handle \"@%s\"", nm.c_str ());
73
74 return retval;
75 }
76
77 DEFUN (functions, args, ,
78 "-*- texinfo -*-\n\
79 @deftypefn {Built-in Function} {} functions (@var{fcn_handle})\n\
80 Return a struct containing information about the function handle\n\
81 @var{fcn_handle}.\n\
82 @end deftypefn")
83 {
84 octave_value retval;
85
86 if (args.length () == 1)
87 {
88 octave_fcn_handle fh = args(0).fcn_handle_value ();
89
90 if (! error_state)
91 {
92 octave_function *fcn = fh.function_value (true);
93
94 if (fcn)
95 {
96 Octave_map m;
97
98 m ["function"](0) = fh.name ();
99
100 if (fcn->is_nested_function ())
101 m ["type"](0) = "subfunction";
102 else
103 m ["type"](0) = "simple";
104
105 std::string nm = fcn->fcn_file_name ();
106
107 if (nm.empty ())
108 m ["file"](0) = "built-in function";
109 else
110 m ["file"](0) = nm;
111
112 retval = m;
113 }
114 else
115 error ("functions: invalid function handle object");
116 }
117 else
118 error ("functions: argument must be a function handle object");
119 }
120 else
121 print_usage ("functions");
122
123 return retval;
124 }
125
126 DEFUN (func2str, args, ,
127 "-*- texinfo -*-\n\
128 @deftypefn {Built-in Function} {} func2str (@var{fcn_handle})\n\
129 Return a string containing the name of the function referenced by\n\
130 the function handle @var{fcn_handle}.\n\
131 @end deftypefn")
132 {
133 octave_value retval;
134
135 if (args.length () == 1)
136 {
137 octave_fcn_handle fh = args(0).fcn_handle_value ();
138
139 if (! error_state)
140 retval = fh.name ();
141 else
142 error ("func2str: expecting function handle as first argument");
143 }
144 else
145 print_usage ("func2str");
146
147 return retval;
148 }
149
150 DEFUN (str2func, args, ,
151 "-*- texinfo -*-\n\
152 @deftypefn {Built-in Function} {} str2func (@var{fcn_name})\n\
153 Return a function handle constructed from the string @var{fcn_name}.\n\
154 @end deftypefn")
155 {
156 octave_value retval;
157
158 if (args.length () == 1)
159 {
160 std::string nm = args(0).string_value ();
161
162 if (! error_state)
163 retval = make_fcn_handle (nm);
164 else
165 error ("str2func: expecting string as first argument");
166 }
167 else
168 print_usage ("str2func");
169
170 return retval;
171 }
172
173 /*
174 ;;; Local Variables: ***
175 ;;; mode: C++ ***
176 ;;; End: ***
177 */