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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

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 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

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 *

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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

 *

 *

 * 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.NoSuchElementException;

import static jdk.internal.joptsimple.ParserRules.*;

/**

 * Tokenizes a short option specification string.

 *

 * @author <a href="mailto:pholser@alumni.rice.edu">Paul Holser</a>

 */

class OptionSpecTokenizer {

    private static final char POSIXLY_CORRECT_MARKER = '+';

    private static final char HELP_MARKER = '*';

    private String specification;

    private int index;

    OptionSpecTokenizer( String specification ) {

        if ( specification == null )

            throw new NullPointerException( "null option specification" );

        this.specification = specification;

    }

    boolean hasMore() {

        return index < specification.length();

    }

    AbstractOptionSpec<?> next() {

        if ( !hasMore() )

            throw new NoSuchElementException();

        String optionCandidate = String.valueOf( specification.charAt( index ) );

        index++;

        AbstractOptionSpec<?> spec;

        if ( RESERVED_FOR_EXTENSIONS.equals( optionCandidate ) ) {

            spec = handleReservedForExtensionsToken();

            if ( spec != null )

                return spec;

        }

        ensureLegalOption( optionCandidate );

        if ( hasMore() ) {

            boolean forHelp = false;

            if ( specification.charAt( index ) == HELP_MARKER ) {

                forHelp = true;

                ++index;

            }

            spec = hasMore() && specification.charAt( index ) == ':'

                ? handleArgumentAcceptingOption( optionCandidate )

                : new NoArgumentOptionSpec( optionCandidate );

            if ( forHelp )

                spec.forHelp();

        } else

            spec = new NoArgumentOptionSpec( optionCandidate );

        return spec;

    }

    void configure( OptionParser parser ) {

        adjustForPosixlyCorrect( parser );

        while ( hasMore() )

            parser.recognize( next() );

    }

    private void adjustForPosixlyCorrect( OptionParser parser ) {

        if ( POSIXLY_CORRECT_MARKER == specification.charAt( 0 ) ) {

            parser.posixlyCorrect( true );

            specification = specification.substring( 1 );

        }

    }

    private AbstractOptionSpec<?> handleReservedForExtensionsToken() {

        if ( !hasMore() )

            return new NoArgumentOptionSpec( RESERVED_FOR_EXTENSIONS );

        if ( specification.charAt( index ) == ';' ) {

            ++index;

            return new AlternativeLongOptionSpec();

        }

        return null;

    }

    private AbstractOptionSpec<?> handleArgumentAcceptingOption( String candidate ) {

        index++;

        if ( hasMore() && specification.charAt( index ) == ':' ) {

            index++;

            return new OptionalArgumentOptionSpec<String>( candidate );

        }

        return new RequiredArgumentOptionSpec<String>( candidate );

    }

}