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//
// LispSymbol.m
// Moxie
//
// Created by Brian Cully on Tue Sep 07 2004.
// Copyright (c) 2004 Brian Cully. All rights reserved.
//
#import "LispSymbol.h"
@implementation LispSymbol
LispSymbol *BIG_T = nil;
LispSymbol *BIG_NIL = nil;
+ (LispSymbol *)symbolT
{
if (BIG_T == nil)
BIG_T = [[self alloc] initWithName: @"T"];
return BIG_T;
}
+ (LispSymbol *)symbolNIL
{
if (BIG_NIL == nil)
BIG_NIL = [[self alloc] initWithName: @"NIL"];
return BIG_NIL;
}
+ (LispSymbol *)symbolNamed: (NSString *)aName
{
if ([aName caseInsensitiveCompare: @"T"] == NSOrderedSame)
return [LispSymbol symbolT];
else if ([aName caseInsensitiveCompare: @"NIL"] == NSOrderedSame)
return [LispSymbol symbolNIL];
else
return [[[self alloc] initWithName: aName] autorelease];
}
- (id)initWithName: (NSString *)aName
{
self = [super init];
if (self) {
[self setName: aName];
}
return self;
}
- (void)dealloc
{
[self setName: nil];
[super dealloc];
}
- (NSString *)description
{
return [NSString stringWithFormat: @"#<LispSymbol: %@>", [self name]];
}
- (BOOL)boolValue
{
return [self isEqualToString: @"NIL"] == NO;
}
- (double)doubleValue
{
return [[self name] doubleValue];
}
- (float)floatValue
{
return [[self name] floatValue];
}
- (int)intValue
{
return [[self name] intValue];
}
- (NSString *)stringValue
{
return [self name];
}
- (id)copyWithZone: (NSZone *)aZone
{
LispSymbol *result;
result = [[LispSymbol allocWithZone: aZone] init];
[result setName: [self name]];
return result;
}
- (NSUInteger)hash
{
return [[self name] hash];
}
- (BOOL)isEqual: (id)anObject
{
BOOL result;
if ([anObject isKindOfClass: [NSString class]])
result = [self isEqualToString: anObject];
else if ([anObject isKindOfClass: [self class]]) {
result = [self isEqualToString: [anObject name]];
} else
result = [super isEqual: anObject];
return result;
}
- (NSString *)lispForm
{
return [self name];
}
@end
@implementation LispSymbol (Accessors)
- (NSString *)name
{
return theName;
}
- (void)setName: (NSString *)aName
{
[aName retain];
[theName release];
theName = aName;
}
@end
@implementation LispSymbol (Comparators)
- (BOOL)isEqualToString: (NSString *)aString
{
return ([[self name] caseInsensitiveCompare: aString] == NSOrderedSame);
}
@end
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