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.LongConstant;
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 LongLiteral extends NumberLiteral {

	private static final char[] HEXA_MIN_VALUE        = "0x8000000000000000L".toCharArray(); //$NON-NLS-1$
	private static final char[] HEXA_MINUS_ONE_VALUE  = "0xffffffffffffffffL".toCharArray(); //$NON-NLS-1$
	private static final char[] OCTAL_MIN_VALUE       = "01000000000000000000000L".toCharArray(); //$NON-NLS-1$
	private static final char[] OCTAL_MINUS_ONE_VALUE = "01777777777777777777777L".toCharArray(); //$NON-NLS-1$
	private static final char[] DECIMAL_MIN_VALUE     = "9223372036854775808L".toCharArray(); //$NON-NLS-1$
	private static final char[] DECIMAL_MAX_VALUE     = "9223372036854775807L".toCharArray(); //$NON-NLS-1$

	private char[] reducedForm; // no underscores

	public static LongLiteral buildLongLiteral(char[] token, int s, int e) {
		// remove '_' and prefix '0' first
		char[] longReducedToken = removePrefixZerosAndUnderscores(token, true);
		switch(longReducedToken.length) {
			case 19 :
				// 0x8000000000000000L
				if (CharOperation.equals(longReducedToken, HEXA_MIN_VALUE)) {
					return new LongLiteralMinValue(token, longReducedToken != token ? longReducedToken : null, s, e);
				}
				break;
			case 24 :
				// 01000000000000000000000L
				if (CharOperation.equals(longReducedToken, OCTAL_MIN_VALUE)) {
					return new LongLiteralMinValue(token, longReducedToken != token ? longReducedToken : null, s, e);
				}
				break;
		}
		return new LongLiteral(token, longReducedToken != token ? longReducedToken : null, s, e);
	}

LongLiteral(char[] token, char[] reducedForm, int start, int end) {
	super(token, start, end);
	this.reducedForm = reducedForm;
}
public LongLiteral convertToMinValue() {
	if (((this.bits & ASTNode.ParenthesizedMASK) >> ASTNode.ParenthesizedSHIFT) != 0) {
		return this;
	}
	char[] token = this.reducedForm != null ? this.reducedForm : this.source;
	switch(token.length) {
		case 20 :
			// 9223372036854775808L
			if (CharOperation.equals(token, DECIMAL_MIN_VALUE, false)) {
				return new LongLiteralMinValue(this.source, this.reducedForm, this.sourceStart, this.sourceEnd);
			}
			break;
	}
	return this;
}
@Override
public void computeConstant() {
	char[] token = this.reducedForm != null ? this.reducedForm : this.source;
	int tokenLength = token.length;
	int length = tokenLength - 1;
	int radix = 10;
	int j = 0;
	if (token[0] == '0') {
		if (length == 1) {
			this.constant = LongConstant.fromValue(0L);
			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 ((length - 2) > 64) { // remove 0b or 0B
				return; /*constant stays null*/
			}
			computeValue(token, length, radix, j);
			break;
		case 16 :
			if (tokenLength <= 19) {
				if (CharOperation.equals(token, HEXA_MINUS_ONE_VALUE)) {
					this.constant = LongConstant.fromValue(-1L);
					return;
				}
				computeValue(token, length, radix, j);
			}
			break;
		case 10 :
			if (tokenLength > DECIMAL_MAX_VALUE.length
					|| (tokenLength == DECIMAL_MAX_VALUE.length
							&& CharOperation.compareTo(token, DECIMAL_MAX_VALUE, 0, length) > 0)) {
				return; /*constant stays null*/
			}
			computeValue(token, length, radix, j);
			break;
		case 8 :
			if (tokenLength <= 24) {
				if (tokenLength == 24 && token[j] > '1') {
					return; /*constant stays null*/
				}
				if (CharOperation.equals(token, OCTAL_MINUS_ONE_VALUE)) {
					this.constant = LongConstant.fromValue(-1L);
					return;
				}
				computeValue(token, length, radix, j);
			}
			break;
	}
}
private void computeValue(char[] token, int tokenLength, int radix, int j) {
	int digitValue;
	long computedValue = 0;
	while (j < tokenLength) {
		if ((digitValue = ScannerHelper.digit(token[j++],radix)) < 0) {
			return; /*constant stays null*/
		}
		computedValue = (computedValue * radix) + digitValue ;
	}
	this.constant = LongConstant.fromValue(computedValue);
}
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.LONG;
}
@Override
public void traverse(ASTVisitor visitor, BlockScope scope) {
	visitor.visit(this, scope);
	visitor.endVisit(this, scope);
}
}