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/* -*- mode: objc; coding: utf-8 -*- */
/* Étoilisp/Mulklisp, a Common Lisp subset for the Étoilé runtime.
* Copyright (C) 2008 Matthias Andreas Benkard.
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#import <Foundation/NSDictionary.h>
#import <Foundation/NSArray.h>
#import <Foundation/NSThread.h>
#import "MLKDynamicContext.h"
#import "MLKEnvironment.h"
#import "MLKLinkedList.h"
#define MAKE_ENVIRONMENT(variable, parent, parent_member) \
(variable \
? (id) [[MLKEnvironment alloc] \
initWithParent:(parent \
? (id) parent_member \
: nil) \
bindings:vars] \
: (id) (parent ? (id) RETAIN (parent_member) : nil));
@implementation MLKDynamicContext
-(MLKDynamicContext *) initWithParent:(MLKDynamicContext *)aContext
variables:(NSDictionary *)vars
handlers:(NSDictionary *)handlers
restarts:(NSDictionary *)restarts
catchTags:(NSDictionary *)catchTags
activeHandlerEnvironment:(MLKEnvironment *)handlerEnv;
{
self = [super init];
ASSIGN (_parent, (aContext ? aContext : [MLKDynamicContext currentContext]));
_environment = MAKE_ENVIRONMENT(vars, _parent, _parent->_environment);
_conditionHandlers = MAKE_ENVIRONMENT(handlers,
_parent,
_parent->_conditionHandlers);
_restarts = MAKE_ENVIRONMENT(restarts, _parent, _parent->_restarts);
_catchTags = MAKE_ENVIRONMENT(catchTags, _parent, _parent->_catchTags);
ASSIGN (_activeHandlerEnvironment,
handlerEnv
? (id) handlerEnv
: (_parent
? (id) (_parent->_activeHandlerEnvironment)
: nil));
return self;
}
-(MLKDynamicContext *) pushContext
{
return [[[NSThread currentThread] threadDictionary]
objectForKey:@"MLKDynamicContext"];
}
+(MLKDynamicContext *) currentContext
{
return [[[NSThread currentThread] threadDictionary]
objectForKey:@"MLKDynamicContext"];
}
+(MLKDynamicContext *) popContext
{
MLKDynamicContext *context = [self currentContext];
[[[NSThread currentThread] threadDictionary] setObject:context->_parent
forKey:@"MLKDynamicContext"];
return context;
}
-(MLKEnvironment *) environment
{
return _environment;
}
-(id) findRestart:(MLKSymbol *)symbol
{
NS_DURING
{
return [_restarts valueForBinding:symbol];
}
NS_HANDLER
{
if ([[localException name] isEqualToString: @"MLKUndefinedVariableException"])
NS_VALUERETURN (nil, id);
else
[localException raise];
}
NS_ENDHANDLER;
return nil;
}
-(id) findHandler:(MLKSymbol *)symbol
{
NS_DURING
{
if (_activeHandlerEnvironment)
return [[_activeHandlerEnvironment parent] valueForBinding:symbol];
else
return [_conditionHandlers valueForBinding:symbol];
}
NS_HANDLER
{
if ([[localException name] isEqualToString: @"MLKUndefinedVariableException"])
NS_VALUERETURN (nil, id);
else
[localException raise];
}
NS_ENDHANDLER;
return nil;
}
-(id) findCatchTag:(MLKSymbol *)symbol
{
NS_DURING
{
return [_catchTags valueForBinding:symbol];
}
NS_HANDLER
{
if ([[localException name] isEqualToString: @"MLKUndefinedVariableException"])
NS_VALUERETURN (nil, id);
else
[localException raise];
}
NS_ENDHANDLER;
return nil;
}
-(id) valueForBinding:(MLKSymbol *)symbol
{
return [[[MLKDynamicContext currentContext] environment]
valueForBinding:symbol];
}
-(void) setValue:(id)value forBinding:(MLKSymbol *)symbol
{
[[[MLKDynamicContext currentContext] environment]
setValue:value
forBinding:symbol];
}
-(void) dealloc
{
RELEASE (_conditionHandlers);
RELEASE (_restarts);
RELEASE (_catchTags);
RELEASE (_activeHandlerEnvironment);
RELEASE (_environment);
RELEASE (_parent);
[super dealloc];
}
@end
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