/*
 * Copyright (C) 2017 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */
"use strict";

function createLiteral(config)
{
    class GenericLiteral extends Expression {
        constructor(origin, value)
        {
            super(origin);
            this._value = value;
            this.type = config.createType.call(this, origin, value);
        }
        
        static withType(origin, value, type)
        {
            let result = new GenericLiteral(origin, value);
            result.type = TypeRef.wrap(type);
            return result;
        }
        
        get value() { return this._value; }
        
        // This is necessary because once we support int64, we'll need that to be represented as an object
        // rather than as a primitive. Then we'll need to convert.
        get valueForSelectedType()
        {
            let type = this.type.type.unifyNode;
            if (!type)
                throw new Error("Cannot get type for " + this);
            let func = type["formatValueFrom" + config.literalClassName];
            if (!func)
                throw new Error("Cannot get function to format type for " + config.literalClassName + " from " + type);
            return func.call(type, this.value);
        }
        
        get isConstexpr() { return true; }
        get isLiteral() { return true; }
        
        get negConstexpr()
        {
            if (!config.negConstexpr)
                return null;
            
            return () => config.negConstexpr.call(this);
        }
        
        unifyImpl(unificationContext, other)
        {
            if (!(other instanceof GenericLiteral))
                return false;
            return this.value == other.value;
        }
        
        toString()
        {
            return config.preferredTypeName + "Literal<" + this.value + ">";
        }
    }
    
    return GenericLiteral;
}