Escapes a text so that it can be used as a Java String literal. - Java java.lang

Java examples for java.lang:String Escape

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Description

Escapes a text so that it can be used as a Java String literal.

Demo Code

/*//from   w ww  . j av a  2 s.  com
 * JasperReports - Free Java Reporting Library.
 * Copyright (C) 2001 - 2013 Jaspersoft Corporation. All rights reserved.
 * http://www.jaspersoft.com
 *
 * Unless you have purchased a commercial license agreement from Jaspersoft,
 * the following license terms apply:
 *
 * This program is part of JasperReports.
 *
 * JasperReports is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * JasperReports is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with JasperReports. If not, see <http://www.gnu.org/licenses/>.
 */

/*
 * Contributors:
 * Gaganis Giorgos - gaganis@users.sourceforge.net
 */
 
//package com.java2s;

public class Main {
    public static void main(String[] argv) {
        String input = "\\";
        System.out.println(escapeJavaScript(input));
    }

    /**
     * Escapes a text so that it can be used as a Java String literal.
     * 
     * @param input
     */
    public static String escapeJavaScript(String input) {
        if (input == null) {
            return input;
        }

        StringBuilder filtered = new StringBuilder(input.length());
        char prevChar = '\u0000';
        char c;
        for (int i = 0; i < input.length(); i++) {
            c = input.charAt(i);
            if (c == '"') {
                filtered.append("\\\"");
            } else if (c == '\'') {
                filtered.append("\\'");
            } else if (c == '\\') {
                filtered.append("\\\\");
            } else if (c == '/') {
                filtered.append("\\/");
            } else if (c == '\t') {
                filtered.append("\\t");
            } else if (c == '\n') {
                if (prevChar != '\r') {
                    filtered.append("\\n");
                }
            } else if (c == '\r') {
                filtered.append("\\n");
            } else if (c == '\f') {
                filtered.append("\\f");
            } else {
                filtered.append(c);
            }
            prevChar = c;

        }
        return filtered.toString();
    }
}

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