ParserRules.java

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/*
 * This file is available under and governed by the GNU General Public
 * License version 2 only, as published by the Free Software Foundation.
 * However, the following notice accompanied the original version of this
 * file:
 *
 * The MIT License
 *
 * Copyright (c) 2004-2015 Paul R. Holser, Jr.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

package jdk.internal.joptsimple;

import java.util.List;

import static java.lang.Character.*;

/**
 * Can tell whether or not options are well-formed.
 *
 * @author <a href="mailto:[email protected]">Paul Holser</a>
 */
final class ParserRules {
    static final char HYPHEN_CHAR = '-';
    static final String HYPHEN = String.valueOf( HYPHEN_CHAR );
    static final String DOUBLE_HYPHEN = "--";
    static final String OPTION_TERMINATOR = DOUBLE_HYPHEN;
    static final String RESERVED_FOR_EXTENSIONS = "W";

    private ParserRules() {
        throw new UnsupportedOperationException();
    }

    static boolean isShortOptionToken( String argument ) {
        return argument.startsWith( HYPHEN )
            && !HYPHEN.equals( argument )
            && !isLongOptionToken( argument );
    }

    static boolean isLongOptionToken( String argument ) {
        return argument.startsWith( DOUBLE_HYPHEN ) && !isOptionTerminator( argument );
    }

    static boolean isOptionTerminator( String argument ) {
        return OPTION_TERMINATOR.equals( argument );
    }

    static void ensureLegalOption( String option ) {
        if ( option.startsWith( HYPHEN ) )
            throw new IllegalOptionSpecificationException( String.valueOf( option ) );

        for ( int i = 0; i < option.length(); ++i )
            ensureLegalOptionCharacter( option.charAt( i ) );
    }

    static void ensureLegalOptions( List<String> options ) {
        for ( String each : options )
            ensureLegalOption( each );
    }

    private static void ensureLegalOptionCharacter( char option ) {
        if ( !( isLetterOrDigit( option ) || isAllowedPunctuation( option ) ) )
            throw new IllegalOptionSpecificationException( String.valueOf( option ) );
    }

    private static boolean isAllowedPunctuation( char option ) {
        String allowedPunctuation = "?._" + HYPHEN_CHAR;
        return allowedPunctuation.indexOf( option ) != -1;
    }
}