1/*
2 * Copyright (c) 2009, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26/*
27 * This file is available under and governed by the GNU General Public
28 * License version 2 only, as published by the Free Software Foundation.
29 * However, the following notice accompanied the original version of this
30 * file:
31 *
32 * The MIT License
33 *
34 * Copyright (c) 2004-2014 Paul R. Holser, Jr.
35 *
36 * Permission is hereby granted, free of charge, to any person obtaining
37 * a copy of this software and associated documentation files (the
38 * "Software"), to deal in the Software without restriction, including
39 * without limitation the rights to use, copy, modify, merge, publish,
40 * distribute, sublicense, and/or sell copies of the Software, and to
41 * permit persons to whom the Software is furnished to do so, subject to
42 * the following conditions:
43 *
44 * The above copyright notice and this permission notice shall be
45 * included in all copies or substantial portions of the Software.
46 *
47 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
48 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
49 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
50 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
51 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
52 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
53 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
54 */
55
56package jdk.internal.joptsimple;
57
58import java.util.NoSuchElementException;
59
60import static jdk.internal.joptsimple.ParserRules.*;
61
62/**
63 * Tokenizes a short option specification string.
64 *
65 * @author <a href="mailto:pholser@alumni.rice.edu">Paul Holser</a>
66 */
67class OptionSpecTokenizer {
68    private static final char POSIXLY_CORRECT_MARKER = '+';
69    private static final char HELP_MARKER = '*';
70
71    private String specification;
72    private int index;
73
74    OptionSpecTokenizer( String specification ) {
75        if ( specification == null )
76            throw new NullPointerException( "null option specification" );
77
78        this.specification = specification;
79    }
80
81    boolean hasMore() {
82        return index < specification.length();
83    }
84
85    AbstractOptionSpec<?> next() {
86        if ( !hasMore() )
87            throw new NoSuchElementException();
88
89
90        String optionCandidate = String.valueOf( specification.charAt( index ) );
91        index++;
92
93        AbstractOptionSpec<?> spec;
94        if ( RESERVED_FOR_EXTENSIONS.equals( optionCandidate ) ) {
95            spec = handleReservedForExtensionsToken();
96
97            if ( spec != null )
98                return spec;
99        }
100
101        ensureLegalOption( optionCandidate );
102
103        if ( hasMore() ) {
104            boolean forHelp = false;
105            if ( specification.charAt( index ) == HELP_MARKER ) {
106                forHelp = true;
107                ++index;
108            }
109            spec = hasMore() && specification.charAt( index ) == ':'
110                ? handleArgumentAcceptingOption( optionCandidate )
111                : new NoArgumentOptionSpec( optionCandidate );
112            if ( forHelp )
113                spec.forHelp();
114        } else
115            spec = new NoArgumentOptionSpec( optionCandidate );
116
117        return spec;
118    }
119
120    void configure( OptionParser parser ) {
121        adjustForPosixlyCorrect( parser );
122
123        while ( hasMore() )
124            parser.recognize( next() );
125    }
126
127    private void adjustForPosixlyCorrect( OptionParser parser ) {
128        if ( POSIXLY_CORRECT_MARKER == specification.charAt( 0 ) ) {
129            parser.posixlyCorrect( true );
130            specification = specification.substring( 1 );
131        }
132    }
133
134    private AbstractOptionSpec<?> handleReservedForExtensionsToken() {
135        if ( !hasMore() )
136            return new NoArgumentOptionSpec( RESERVED_FOR_EXTENSIONS );
137
138        if ( specification.charAt( index ) == ';' ) {
139            ++index;
140            return new AlternativeLongOptionSpec();
141        }
142
143        return null;
144    }
145
146    private AbstractOptionSpec<?> handleArgumentAcceptingOption( String candidate ) {
147        index++;
148
149        if ( hasMore() && specification.charAt( index ) == ':' ) {
150            index++;
151            return new OptionalArgumentOptionSpec<String>( candidate );
152        }
153
154        return new RequiredArgumentOptionSpec<String>( candidate );
155    }
156}
157