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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/NSArray.h>
#import <Foundation/NSDictionary.h>
#import <Foundation/NSException.h>
#import <Foundation/NSNull.h>
#import <Foundation/NSSet.h>
#import "MLKEnvironment.h"
#import "NSObject-MLKPrinting.h"
#import "runtime-compatibility.h"
@implementation MLKEnvironment
-(MLKEnvironment *) init
{
return [self initWithParent:nil values:nil];
}
-(MLKEnvironment *) initWithParent:(MLKEnvironment *)parent
values:(NSDictionary *)bindings
{
self = [super init];
_bindings = [[NSMutableDictionary alloc] initWithCapacity:10];
ASSIGN (_parent, parent);
[self addValues:bindings];
return self;
}
-(MLKEnvironment *) initWithParent:(MLKEnvironment *)parent
{
return [self initWithParent:parent values:nil];
}
-(MLKEnvironment *) initWithValues:(NSDictionary *)bindings
{
return [self initWithParent:nil values:bindings];
}
-(MLKEnvironment *) parent
{
return _parent;
}
-(NSSet *) bindings
{
NSSet *set = [NSSet setWithArray:[_bindings allKeys]];
return (_parent
? (id)[set setByAddingObjectsFromSet:[_parent bindings]]
: (id)set);
}
-(void) setValue:(id)value forSymbol:(MLKSymbol *)symbol;
{
MLKBinding *binding;
if (!(binding = [self bindingForSymbol:symbol]))
[NSException raise:@"MLKUnboundVariableError"
format:@"The variable %@ is unbound.",
[symbol descriptionForLisp]];
[binding setValue:value];
}
-(id) valueForSymbol:(MLKSymbol *)symbol
{
MLKBinding *binding;
if (!(binding = [self bindingForSymbol:symbol]))
[NSException raise:@"MLKUnboundVariableError"
format:@"The variable %@ is unbound.",
[symbol descriptionForLisp]];
return [binding value];
}
-(MLKBinding*) bindingForSymbol:(MLKSymbol *)symbol
{
MLKBinding *binding;
symbol = symbol ? (id)symbol : (id)[NSNull null];
if ((binding = [_bindings objectForKey:symbol]))
return binding;
else
if (_parent)
return [_parent bindingForSymbol:symbol];
else
return nil;
}
-(void) addBindings:(NSDictionary *)bindings
{
[_bindings addEntriesFromDictionary:bindings];
}
-(void) addValues:(NSDictionary *)bindings
{
int i;
NSArray *keys;
keys = [bindings allKeys];
for (i = 0; i < [keys count]; i++)
{
id key = [keys objectAtIndex:i];
id value = [bindings objectForKey:key];
value = (value == [NSNull null]) ? nil : value;
[_bindings setObject:[MLKBinding bindingWithValue:value]
forKey:key];
}
}
-(void) addValue:(id)value forSymbol:(MLKSymbol *)symbol;
{
symbol = symbol ? (id)symbol : (id)[NSNull null];
[_bindings setObject:[MLKBinding bindingWithValue:value]
forKey:symbol];
}
-(void) addBindingForSymbol:(MLKSymbol *)symbol
{
[_bindings setObject:[MLKBinding binding]
forKey:(symbol ? (id)symbol : (id)[NSNull null])];
}
-(MLKEnvironment *) environmentForSymbol:(MLKSymbol *)symbol
{
if ([_bindings objectForKey:symbol])
return self;
else if (_parent)
return [_parent environmentForSymbol:symbol];
else
return nil;
}
-(BOOL) boundp:(MLKSymbol *)symbol
{
MLKBinding *binding;
if ((binding = [self bindingForSymbol:symbol]))
return [binding boundp];
else
return NO;
}
-(void) makunbound:(MLKSymbol *)symbol
{
MLKBinding *binding;
if ((binding = [self bindingForSymbol:symbol]))
[binding makunbound];
}
-(void) dealloc
{
RELEASE (_bindings);
RELEASE (_parent);
[super dealloc];
}
@end
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