is Javascript Octal Escape - Java Scripting

Java examples for Scripting:Javascript

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Description

is Javascript Octal Escape

Demo Code

/*/*from   ww w.ja v  a 2  s  .c  o m*/
 * =============================================================================
 * 
 *   Copyright (c) 2014, The UNBESCAPE team (http://www.unbescape.org)
 * 
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 * 
 *       http://www.apache.org/licenses/LICENSE-2.0
 * 
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 * 
 * =============================================================================
 */
//package com.java2s;

public class Main {
    static boolean isOctalEscape(final String text, final int start,
            final int end) {

        if (start >= end) {
            return false;
        }

        final char c1 = text.charAt(start);
        if (c1 < '0' || c1 > '7') {
            return false;
        }

        if (start + 1 >= end) {
            return (c1 != '0'); // It would not be an octal escape, but the U+0000 escape sequence.
        }

        final char c2 = text.charAt(start + 1);
        if (c2 < '0' || c2 > '7') {
            return (c1 != '0'); // It would not be an octal escape, but the U+0000 escape sequence.
        }

        if (start + 2 >= end) {
            return (c1 != '0' || c2 != '0'); // It would not be an octal escape, but the U+0000 escape sequence + '0'.
        }

        final char c3 = text.charAt(start + 2);
        if (c3 < '0' || c3 > '7') {
            return (c1 != '0' || c2 != '0'); // It would not be an octal escape, but the U+0000 escape sequence + '0'.
        }

        return (c1 != '0' || c2 != '0' || c3 != '0'); // Check it's not U+0000 (escaped) + '00'

    }

    static boolean isOctalEscape(final char[] text, final int start,
            final int end) {

        if (start >= end) {
            return false;
        }

        final char c1 = text[start];
        if (c1 < '0' || c1 > '7') {
            return false;
        }

        if (start + 1 >= end) {
            return (c1 != '0'); // It would not be an octal escape, but the U+0000 escape sequence.
        }

        final char c2 = text[start + 1];
        if (c2 < '0' || c2 > '7') {
            return (c1 != '0'); // It would not be an octal escape, but the U+0000 escape sequence.
        }

        if (start + 2 >= end) {
            return (c1 != '0' || c2 != '0'); // It would not be an octal escape, but the U+0000 escape sequence + '0'.
        }

        final char c3 = text[start + 2];
        if (c3 < '0' || c3 > '7') {
            return (c1 != '0' || c2 != '0'); // It would not be an octal escape, but the U+0000 escape sequence + '0'.
        }

        return (c1 != '0' || c2 != '0' || c3 != '0'); // Check it's not U+0000 (escaped) + '00'

    }
}

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