1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
|
/*
* Copyright (c) 2009 Samit Basu
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "Array.hpp"
#include "Interpreter.hpp"
#include "PathSearch.hpp"
#include <QtCore>
static int ExistBuiltinFunction(QString fname, Interpreter* eval) {
bool isDefed;
FuncPtr d;
isDefed = eval->getContext()->lookupFunction(fname,d);
if (isDefed && ((d->type() == FM_BUILT_IN_FUNCTION) ||
(d->type() == FM_SPECIAL_FUNCTION)))
return 5;
else
return 0;
return 0;
}
static int ExistDirFunction(QString fname, Interpreter* eval) {
// Check for extra termination
int flen = fname.size();
if ((fname[flen-1] == '/') ||
(fname[flen-1] == '\\'))
fname[flen-1] = 0;
QFileInfo filestat(fname);
if (!filestat.exists()) return 0;
if (filestat.isDir()) return 7;
return 0;
}
static int ExistFileFunction(QString fname, Interpreter* eval) {
PathSearcher src(eval->getPath());
QString path = src.ResolvePath(fname);
if( !path.isNull() )
return 2;
bool isDefed;
FuncPtr d;
isDefed = eval->getContext()->lookupFunction(fname,d);
if (isDefed && (d->type() == FM_M_FUNCTION))
return 2;
return 0;
}
static int ExistVariableFunction(QString fname, Interpreter* eval) {
ParentScopeLocker lock(eval->getContext());
bool isDefed = (eval->getContext()->lookupVariable(fname).valid());
if (isDefed)
return 1;
else
return 0;
}
static int ExistAllFunction(QString fname, Interpreter* eval) {
int ret;
ret = ExistVariableFunction(fname,eval);
if (ret) return ret;
ret = ExistFileFunction(fname,eval);
if (ret) return ret;
ret = ExistDirFunction(fname,eval);
if (ret) return ret;
ret = ExistBuiltinFunction(fname,eval);
if (ret) return ret;
return 0;
}
//!
//@Module EXIST Test for Existence
//@@Section INSPECTION
//@@Usage
//Tests for the existence of a variable, function, directory or
//file. The general syntax for its use is
//@[
// y = exist(item,kind)
//@]
//where @|item| is a string containing the name of the item
//to look for, and @|kind| is a string indicating the type
//of the search. The @|kind| must be one of
//\begin{itemize}
//\item @|'builtin'| checks for built-in functions
//\item @|'dir'| checks for directories
//\item @|'file'| checks for files
//\item @|'var'| checks for variables
//\item @|'all'| checks all possibilities (same as leaving out @|kind|)
//\end{itemize}
//You can also leave the @|kind| specification out, in which case
//the calling syntax is
//@[
// y = exist(item)
//@]
//The return code is one of the following:
//\begin{itemize}
//\item 0 - if @|item| does not exist
//\item 1 - if @|item| is a variable in the workspace
//\item 2 - if @|item| is an M file on the search path, a full pathname
// to a file, or an ordinary file on your search path
//\item 5 - if @|item| is a built-in FreeMat function
//\item 7 - if @|item| is a directory
//\end{itemize}
//Note: previous to version @|1.10|, @|exist| used a different notion
//of existence for variables: a variable was said to exist if it
//was defined and non-empty. This test is now performed by @|isset|.
//@@Example
//Some examples of the @|exist| function. Note that generally @|exist|
//is used in functions to test for keywords. For example,
//@[
// function y = testfunc(a, b, c)
// if (~exist('c'))
// % c was not defined, so establish a default
// c = 13;
// end
// y = a + b + c;
//@]
//An example of @|exist| in action.
//@<
//a = randn(3,5,2)
//b = []
//who
//exist('a')
//exist('b')
//exist('c')
//@>
//@@Tests
//@{ test_exist1.m
//function x = test_exist1
//x = test_exist1_assist;
//x = test_exist1_assist;
//
//function y = test_exist1_assist
//persistent x
//if (exist('x'))
// y = 1;
//else
// y = 0;
// x = 1;
//end
//@}
//@{ test_exist2.m
//function x = test_exist2
//persistent y
//x = 1;
//if (~exist('y'))
// x = 0;
//end
//@}
//@@Signature
//sfunction exist ExistFunction
//inputs item kind
//outputs y
//!
ArrayVector ExistFunction(int nargout, const ArrayVector& arg, Interpreter* eval) {
if (arg.size() < 1)
throw Exception("exist function takes at least one argument - the name of the object to check for");
QString fname = arg[0].asString();
QString stype;
if (arg.size() > 1) {
stype = arg[1].asString();
} else {
stype = "all";
}
int retval;
if (stype=="all")
retval = ExistAllFunction(fname,eval);
else if (stype=="builtin")
retval = ExistBuiltinFunction(fname,eval);
else if (stype=="dir")
retval = ExistDirFunction(fname,eval);
else if (stype=="file")
retval = ExistFileFunction(fname,eval);
else if (stype=="var")
retval = ExistVariableFunction(fname,eval);
else throw Exception("Unrecognized search type for function 'exist'");
return ArrayVector(Array(double(retval)));
}
|
