@import "CPExpression.j"
@import <Foundation/CPString.j>
@import <Foundation/CPDictionary.j>
@import <Foundation/CPCoder.j>

var defaultInstance = nil;
@implementation CPExpression_self : CPExpression
{
}

- (id)init
{
    if (defaultInstance == nil)
    {
        [super initWithExpressionType:CPEvaluatedObjectExpressionType];
        defaultInstance = self;
    }    
    
    return defaultInstance;
}

- (id)initWithCoder:(CPCoder)coder
{
    return [self init];
}

- (void)encodeWithCoder:(CPCoder)coder
{
}

- (BOOL)isEqual:(id)object
{
    return (object === self);
}

- (id)expressionValueWithObject:(id)object context:(CPDictionary)context
{
    return object;
}

- (CPExpression)_expressionWithSubstitutionVariables:(CPDictionary)variables
{
    return self;
}

- (CPString)description
{
    return @"SELF";
}

@end