/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package net.sourceforge.phpeclipse.internal.compiler.ast;

import net.sourceforge.phpdt.internal.compiler.IAbstractSyntaxTreeVisitor;
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 FloatLiteral extends NumberLiteral {
	float value;
	final static float Float_MIN_VALUE = Float.intBitsToFloat(1); // work-around VAJ problem 1F6IGUU
public FloatLiteral(char[] token, int s, int e) {
	super(token, s,e);
}
public void computeConstant() {

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

	Float computedValue;
	try {
		computedValue = Float.valueOf(String.valueOf(source));
	} catch (NumberFormatException e) {
		return;
	} 

	if (computedValue.doubleValue() > Float.MAX_VALUE){
		return; //may be Infinity
	}
	if (computedValue.floatValue() < Float_MIN_VALUE){
		// see 1F6IGUU
		//only a true 0 can be made of zeros
		//1.00000000e-46f is illegal ....
		label : for (int i = 0; i < source.length; i++) { 
			switch (source[i]) {
				case '.' :
				case 'f' :
				case 'F' :
				case '0' :
					break;
				case 'e' :
				case 'E' :
					break label; //exposant are valid !....
				default :
					return; //error


			}
		}
	}
	constant = Constant.fromValue(value = computedValue.floatValue());
}
/**
 * Code generation for float literal
 *
 * @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_float)
//			codeStream.generateInlinedValue(value);
//		else
//			codeStream.generateConstant(constant, implicitConversion);
//	codeStream.recordPositionsFrom(pc, this.sourceStart);
//}
public TypeBinding literalType(BlockScope scope) {
	return FloatBinding;
}
public void traverse(IAbstractSyntaxTreeVisitor visitor, BlockScope blockScope) {
	visitor.visit(this, blockScope);
	visitor.endVisit(this, blockScope);
}
}