org.eclipse.jdt.internal.compiler.ast.CharLiteral.java Source code

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Here is the source code for org.eclipse.jdt.internal.compiler.ast.CharLiteral.java

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/*******************************************************************************
 * Copyright (c) 2000, 2009 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.internal.compiler.ASTVisitor;
import org.eclipse.jdt.internal.compiler.impl.*;
import org.eclipse.jdt.internal.compiler.codegen.*;
import org.eclipse.jdt.internal.compiler.lookup.*;
import org.eclipse.jdt.internal.compiler.parser.ScannerHelper;

public class CharLiteral extends NumberLiteral {

    char value;

    public CharLiteral(char[] token, int s, int e) {
        super(token, s, e);
        computeValue();
    }

    @Override
    public void computeConstant() {
        //The source is a  char[3] first and last char are '
        //This is true for both regular char AND unicode char
        //BUT not for escape char like '\b' which are char[4]....
        this.constant = CharConstant.fromValue(this.value);
    }

    private void computeValue() {
        //The source is a  char[3] first and last char are '
        //This is true for both regular char AND unicode char
        //BUT not for escape char like '\b' which are char[4]....
        if ((this.value = this.source[1]) != '\\')
            return;
        char digit;
        switch (digit = this.source[2]) {
        case 'b':
            this.value = '\b';
            break;
        case 't':
            this.value = '\t';
            break;
        case 'n':
            this.value = '\n';
            break;
        case 'f':
            this.value = '\f';
            break;
        case 'r':
            this.value = '\r';
            break;
        case '\"':
            this.value = '\"';
            break;
        case '\'':
            this.value = '\'';
            break;
        case '\\':
            this.value = '\\';
            break;
        default: //octal (well-formed: ended by a ' )
            int number = ScannerHelper.getNumericValue(digit);
            if ((digit = this.source[3]) != '\'')
                number = (number * 8) + ScannerHelper.getNumericValue(digit);
            else {
                this.constant = CharConstant.fromValue(this.value = (char) number);
                break;
            }
            if ((digit = this.source[4]) != '\'')
                number = (number * 8) + ScannerHelper.getNumericValue(digit);
            this.value = (char) number;
            break;
        }
    }

    /**
     * CharLiteral code generation
     *
     * @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.CHAR;
    }

    @Override
    public void traverse(ASTVisitor visitor, BlockScope blockScope) {
        visitor.visit(this, blockScope);
        visitor.endVisit(this, blockScope);
    }
}