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/* -*- mode: objc; coding: utf-8 -*- */
/* Copyright 2008, Matthias Benkard. */
#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) parent_member : nil));
@implementation MLKDynamicContext
-(MLKDynamicContext *) initWithParent:(MLKDynamicContext *)aContext
variables:(NSDictionary *)vars
handlers:(NSDictionary *)handlers
restarts:(NSDictionary *)restarts
catchTags:(NSDictionary *)catchTags
currentHandler:(MLKClosure *)handler
{
_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);
_currentConditionHandler = (handler
? (id) handler
: (_parent
? (id) _parent->_currentConditionHandler
: 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;
}
@end
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