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/*
* 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 "Module.hpp"
#include "Class.hpp"
//!
//@Module CLEAR Clear or Delete a Variable
//@@Section INSPECTION
//@@Usage
//Clears a set of variables from the current context, or alternately,
//delete all variables defined in the current context. There are
//several formats for the function call. The first is the explicit form
//in which a list of variables are provided:
//@[
// clear a1 a2 ...
//@]
//The variables can be persistent or global, and they will be deleted.
//The second form
//@[
// clear 'all'
//@]
//clears all variables and libraries from the current context. Alternately, you can
//use the form:
//@[
// clear 'libs'
//@]
//which will unload any libraries or DLLs that have been @|import|ed.
//Optionally, you can specify that persistent variables should be cleared via:
//@[
// clear 'persistent'
//@]
//and similarly for global variables:
//@[
// clear 'global'
//@]
//You can use
//@[
// clear 'classes'
//@]
//to clear all definitions of user-defined classes.
//With no arguments, @|clear| defaults to clearing @|'all'|.
//@@Example
//Here is a simple example of using @|clear| to delete a variable. First, we create a variable called @|a|:
//@<
//a = 53
//@>
//Next, we clear @|a| using the @|clear| function, and verify that it is deleted.
//@<1
//clear a
//a
//@>
//@@Tests
//@{ test_clear1.m
//function test_val = test_clear1
// A = 1;
// clear('A');
// test_val = 0;
// try
// B = A;
// catch
// test_val = 1;
// end;
//@}
//@{ test_clear2.m
//function test_val = test_clear2
// A = 1;
// clear('all');
// test_val = 0;
// try
// B = A;
// catch
// test_val = 1;
// end;
//@}
//@@Signature
//sfunction clear ClearFunction
//inputs varargin
//outputs none
//!
static void ClearVariable(Interpreter* eval, QString name) {
Context *context = eval->getContext();
ParentScopeLocker lock(context);
context->deleteVariable(name);
}
static void ClearAllFunction(Interpreter* eval) {
ClearLibs(eval);
Context *context = eval->getContext();
StringVector names;
{
ParentScopeLocker lock(context);
names = context->listAllVariables();
}
for (int i=0;i<(int)names.size();i++)
ClearVariable(eval,names[i]);
}
static void ClearPersistent(Interpreter* eval) {
ParentScopeLocker lock(eval->getContext());
StringVector names = eval->getContext()->listGlobalVariables();
for (int i=0;i<(int)names.size();i++) {
if ((names[i].size() >= 1) && (names[i][0] == '_'))
eval->getContext()->deleteGlobalVariable(names[i]);
}
eval->getContext()->clearPersistentVariableList();
}
static void ClearGlobal(Interpreter* eval) {
ParentScopeLocker lock(eval->getContext());
StringVector names = eval->getContext()->listGlobalVariables();
for (int i=0;i<(int)names.size();i++) {
if ((names[i].size() >= 1) && (names[i][0] != '_')) {
eval->getContext()->deleteGlobalVariable(names[i]);
}
}
eval->getContext()->clearGlobalVariableList();
}
ArrayVector ClearFunction(int nargout, const ArrayVector& arg, Interpreter* eval) {
StringVector names;
if (arg.size() == 0)
names.push_back("all");
else
for (int i=0;i<arg.size();i++)
names.push_back(arg[i].asString());
for (int i=0;i<(int)names.size();i++) {
if (names[i] == "all")
ClearAllFunction(eval);
else if (names[i] == "libs")
ClearLibs(eval);
else if (names[i] == "persistent")
ClearPersistent(eval);
else if (names[i] == "global")
ClearGlobal(eval);
else if (names[i] == "classes")
clearUserClasses();
else
ClearVariable(eval,names[i]);
}
return ArrayVector();
}
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