/*******************************************************************************
 * Copyright (c) 2000, 2001, 2002 International Business Machines Corp. and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v0.5 
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v05.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 ******************************************************************************/
package net.sourceforge.phpdt.internal.compiler.ast;

import net.sourceforge.phpdt.internal.compiler.IAbstractSyntaxTreeVisitor;
import net.sourceforge.phpdt.internal.compiler.codegen.CodeStream;
import net.sourceforge.phpdt.internal.compiler.impl.Constant;
import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
import net.sourceforge.phpdt.internal.compiler.lookup.TypeBinding;

public class DoubleLiteral extends NumberLiteral {
	double value;
public DoubleLiteral(char[] token, int s, int e) {
	super(token, s,e);
}
public void computeConstant() {

	//the source is correctly formated so the exception should never occurs

	Double computedValue;
	try { computedValue = Double.valueOf(String.valueOf(source));}
	catch(NumberFormatException e){return ;} //how can it happen ????

	if (computedValue.doubleValue() > Double.MAX_VALUE) return ; //may be Infinity
	if (computedValue.doubleValue() < Double.MIN_VALUE)
	{	//only a true 0 can be made of zeros :-)
		//2.00000000000000000e-324 is illegal .... 
		label :
			for (int i=0;i<source.length;i++)
			{	//it is welled formated so just test against '0' and potential . D d  
				switch (source[i]){
					case '0' :
					case '.' :
					case 'd' :
					case 'D' : break ;
					case 'e' : 
					case 'E' : break label ; //exposant are valid....!
					default  : return;}}} //error

	constant = Constant.fromValue(value = computedValue.doubleValue());}
/**
 * Code generation for the double literak
 *
 * @param currentScope org.eclipse.jdt.internal.compiler.lookup.BlockScope
 * @param codeStream org.eclipse.jdt.internal.compiler.codegen.CodeStream
 * @param valueRequired boolean
 */
public void generateCode(BlockScope currentScope, CodeStream codeStream, boolean valueRequired) {
	int pc = codeStream.position;
	if (valueRequired)
		if ((implicitConversion >> 4) == T_double)
			codeStream.generateInlinedValue(value);
		else
			codeStream.generateConstant(constant, implicitConversion);
	codeStream.recordPositionsFrom(pc, this.sourceStart);
}
public TypeBinding literalType(BlockScope scope) {
	return DoubleBinding;
}
public void traverse(IAbstractSyntaxTreeVisitor visitor, BlockScope blockScope) {
	visitor.visit(this, blockScope);
	visitor.endVisit(this, blockScope);
}
}