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package com.sun.org.apache.regexp.internal;

/**
 * This is a class that contains utility helper methods for this package.
 *
 * @author Jonathan Locke
 * @version $Id: REUtil.java,v 1.3 2007-07-19 04:35:04 ofung Exp $
 */
public class REUtil
{
    /** complex: */
    private static final String complexPrefix = "complex:";
    
    /**
     * Creates a regular expression, permitting simple or complex syntax 
     * @param expression The expression, beginning with a prefix if it's complex or 
     * having no prefix if it's simple
     * @param matchFlags Matching style flags
     * @return The regular expression object
     * @exception RESyntaxException thrown in case of error
     */
    public static RE createRE(String expression, int matchFlags) throws RESyntaxException
    {
        if (expression.startsWith(complexPrefix))
        {
            return new RE(expression.substring(complexPrefix.length()), matchFlags);
        }
        return new RE(RE.simplePatternToFullRegularExpression(expression), matchFlags);
    }

    /**
     * Creates a regular expression, permitting simple or complex syntax 
     * @param expression The expression, beginning with a prefix if it's complex or 
     * having no prefix if it's simple 
     * @return The regular expression object
     * @exception RESyntaxException thrown in case of error
     */
    public static RE createRE(String expression) throws RESyntaxException
    {
        return createRE(expression, RE.MATCH_NORMAL);
    }
}