Copyright (c) 2000, 2011 IBM Corporation and others.
This program and the accompanying materials
are made available under the terms of the Eclipse Public License 2.0
which accompanies this distribution, and is available at
https://www.eclipse.org/legal/epl-2.0/
SPDX-License-Identifier: EPL-2.0
Contributors:
    IBM Corporation - initial API and implementation
/*******************************************************************************
 * Copyright (c) 2000, 2011 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.compiler.ast;

import org.eclipse.jdt.core.compiler.CharOperation;
import org.eclipse.jdt.internal.compiler.ASTVisitor;
import org.eclipse.jdt.internal.compiler.codegen.CodeStream;
import org.eclipse.jdt.internal.compiler.impl.Constant;
import org.eclipse.jdt.internal.compiler.impl.IntConstant;
import org.eclipse.jdt.internal.compiler.lookup.BlockScope;
import org.eclipse.jdt.internal.compiler.lookup.TypeBinding;
import org.eclipse.jdt.internal.compiler.parser.ScannerHelper;

public class IntLiteral extends NumberLiteral {
	private static final char[] HEXA_MIN_VALUE        = "0x80000000".toCharArray(); //$NON-NLS-1$
	private static final char[] HEXA_MINUS_ONE_VALUE  = "0xffffffff".toCharArray(); //$NON-NLS-1$
	private static final char[] OCTAL_MIN_VALUE       = "020000000000".toCharArray(); //$NON-NLS-1$
	private static final char[] OCTAL_MINUS_ONE_VALUE = "037777777777".toCharArray(); //$NON-NLS-1$
	private static final char[] DECIMAL_MIN_VALUE     = "2147483648".toCharArray(); //$NON-NLS-1$
	private static final char[] DECIMAL_MAX_VALUE     = "2147483647".toCharArray(); //$NON-NLS-1$

	private char[] reducedForm; // no underscores

	public int value;

	//used for ++ and --
	public static final IntLiteral One = new IntLiteral(new char[]{'1'}, null, 0, 0, 1, IntConstant.fromValue(1));

	public static IntLiteral buildIntLiteral(char[] token, int s, int e) {
		// remove '_' and prefix '0' first
		char[] intReducedToken = removePrefixZerosAndUnderscores(token, false);
		switch(intReducedToken.length) {
			case 10 :
				// 0x80000000
				if (CharOperation.equals(intReducedToken, HEXA_MIN_VALUE)) {
					return new IntLiteralMinValue(token, intReducedToken != token ? intReducedToken : null, s, e);
				}
				break;
			case 12 :
				// 020000000000
				if (CharOperation.equals(intReducedToken, OCTAL_MIN_VALUE)) {
					return new IntLiteralMinValue(token, intReducedToken != token ? intReducedToken : null, s, e);
				}
				break;
		}
		return new IntLiteral(token, intReducedToken != token ? intReducedToken : null, s, e);
	}
IntLiteral(char[] token, char[] reducedForm, int start, int end) {
	super(token, start, end);
	this.reducedForm = reducedForm;
}
IntLiteral(char[] token, char[] reducedForm, int start, int end, int value, Constant constant) {
	super(token, start, end);
	this.reducedForm = reducedForm;
	this.value = value;
	this.constant = constant;
}
@Override
public void computeConstant() {
	char[] token = this.reducedForm != null ? this.reducedForm : this.source;
	int tokenLength = token.length;
	int radix = 10;
	int j = 0;
	if (token[0] == '0') {
		if (tokenLength == 1) {
			this.constant = IntConstant.fromValue(0);
			return;
		}
		if ((token[1] == 'x') || (token[1] == 'X')) {
			radix = 16;
			j = 2;
		} else if ((token[1] == 'b') || (token[1] == 'B')) {
			radix = 2;
			j = 2;
		} else {
			radix = 8;
			j = 1;
		}
	}
	switch(radix) {
		case 2 :
			if ((tokenLength - 2) > 32) {
				// remove 0b or 0B
				return; /*constant stays null*/
			}
			computeValue(token, tokenLength, radix, j);
			return;
		case 16 :
			if (tokenLength <= 10) {
				if (CharOperation.equals(token, HEXA_MINUS_ONE_VALUE)) {
					this.constant = IntConstant.fromValue(-1);
					return;
				}
				computeValue(token, tokenLength, radix, j);
				return;
			}
			break;
		case 10 :
			if (tokenLength > DECIMAL_MAX_VALUE.length
					|| (tokenLength == DECIMAL_MAX_VALUE.length
							&& CharOperation.compareTo(token, DECIMAL_MAX_VALUE) > 0)) {
				return; /*constant stays null*/
			}
			computeValue(token, tokenLength, radix, j);
			break;
		case 8 :
			if (tokenLength <= 12) {
				if (tokenLength == 12 && token[j] > '4') {
					return; /*constant stays null*/
				}
				if (CharOperation.equals(token, OCTAL_MINUS_ONE_VALUE)) {
					this.constant = IntConstant.fromValue(-1);
					return;
				}
				computeValue(token, tokenLength, radix, j);
				return;
			}
			break;
	}
}
private void computeValue(char[] token, int tokenLength, int radix, int j) {
	int digitValue;
	int computedValue = 0;
	while (j < tokenLength) {
		if ((digitValue = ScannerHelper.digit(token[j++],radix)) < 0) {
			return; /*constant stays null*/
		}
		computedValue = (computedValue * radix) + digitValue ;
	}
	this.constant = IntConstant.fromValue(computedValue);
}
public IntLiteral convertToMinValue() {
	if (((this.bits & ASTNode.ParenthesizedMASK) >> ASTNode.ParenthesizedSHIFT) != 0) {
		return this;
	}
	char[] token = this.reducedForm != null ? this.reducedForm : this.source;
	switch(token.length) {
		case 10 :
			// 2147483648
			if (CharOperation.equals(token, DECIMAL_MIN_VALUE)) {
				return new IntLiteralMinValue(this.source, this.reducedForm, this.sourceStart, this.sourceEnd);
			}
			break;
	}
	return this;
}
Code generation for long literal
Params:
currentScope – org.eclipse.jdt.internal.compiler.lookup.BlockScope
codeStream – org.eclipse.jdt.internal.compiler.codegen.CodeStream
valueRequired – boolean/**
 * Code generation for long literal
 *
 * @param currentScope org.eclipse.jdt.internal.compiler.lookup.BlockScope
 * @param codeStream org.eclipse.jdt.internal.compiler.codegen.CodeStream
 * @param valueRequired boolean
 */
@Override
public void generateCode(BlockScope currentScope, CodeStream codeStream, boolean valueRequired) {
	int pc = codeStream.position;
	if (valueRequired) {
		codeStream.generateConstant(this.constant, this.implicitConversion);
	}
	codeStream.recordPositionsFrom(pc, this.sourceStart);
}

@Override
public TypeBinding literalType(BlockScope scope) {
	return TypeBinding.INT;
}
@Override
public void traverse(ASTVisitor visitor, BlockScope scope) {
	visitor.visit(this, scope);
	visitor.endVisit(this, scope);
}
}