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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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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
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 * 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:
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 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
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 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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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:Paul Holser
/** * 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 ); } }