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/*
 * Copyright 2003-2007 the original author or authors.
 *
 * 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 org.codehaus.groovy.tools;

import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;

/**
 *  Various utility functions for use in the compiler.
 */

public abstract class Utilities
{
    private static final Set INVALID_JAVA_IDENTIFIERS = new HashSet(Arrays.asList((
            "abstract assert boolean break byte case catch char class const continue default do double else enum " +
            "extends final finally float for goto if implements import instanceof int interface long native new " +
            "package private protected public short static strictfp super switch synchronized this throw throws " +
            "transient try void volatile while true false null").split(" ")));

   /**
    *  Returns a string made up of repetitions of the specified string.
    */

    public static String repeatString( String pattern, int repeats )
    {
        StringBuffer buffer = new StringBuffer( pattern.length() * repeats );
        for( int i = 0; i < repeats; i++ )
        {
            buffer.append( pattern );
        }

        return new String( buffer );
    }


   /**
    *  Returns the end-of-line marker.
    */

    public static String eol()
    {
        return eol;
    }

    /**
     * Tells if the given string is a valid Java identifier.
     */
    public static boolean isJavaIdentifier(String name) {
        if (name.length() == 0 || INVALID_JAVA_IDENTIFIERS.contains(name)) return false;
        char[] chars = name.toCharArray();
        if (!Character.isJavaIdentifierStart(chars[0])) return false;
        for (int i = 1; i < chars.length; i++ ) {
            if (!Character.isJavaIdentifierPart(chars[i])) return false;
        }
        return true;
    }    
    
    private static String eol = System.getProperty( "line.separator", "\n" );

}