name.vysoky.re.Expression.java Source code

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Here is the source code for name.vysoky.re.Expression.java

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/*
 * ePUB Corrector - https://github.com/vysokyj/epub-corrector/
 *
 * Copyright (C) 2012 Jiri Vysoky
 *
 * ePUB Corrector is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published
 * by the Free Software Foundation; either version 3 of the License,
 * or (at your option) any later version.
 *
 * ePUB Corrector 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Cobertura; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 */

package name.vysoky.re;

import org.apache.commons.lang.StringUtils;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Parse and store one regular expression from RE file.
 * Parse regular expression used for replacing texts.
 */
@SuppressWarnings("unused")
public class Expression {

    private String comment;
    private String expression;
    private Pattern pattern;
    private String replacement;

    public Expression(String comment, String expression) throws IllegalArgumentException {
        this.comment = comment;
        this.expression = expression;
        parseExpression();
        if (Replacer.isVerbose())
            System.out.println("Used regular expression: " + expression + " " + comment);
    }

    public String getComment() {
        return comment;
    }

    public String getExpression() {
        return expression;
    }

    public Pattern getPattern() {
        return pattern;
    }

    public String getReplacement() {
        return replacement;
    }

    public String apply(String string) {
        Matcher matcher;
        String oldString;
        do {
            oldString = string;
            matcher = pattern.matcher(string);
            string = matcher.replaceAll(replacement);
        } while (!string.equals(oldString));
        return string;
    }

    private void parseExpression() throws IllegalArgumentException {
        String[] a = StringUtils.split(expression, '/');
        if (a.length != 4)
            throw new IllegalArgumentException("Invalid format of regular expression!");
        pattern = Pattern.compile(a[1]);
        replacement = a[2];
    }
}