1 /*
2 *
3 * Copyright 2004 The Ant-Contrib project
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.codehaus.mojo.natives.parser;
18
19 /**
20 * This parser state checks consumed characters against a specific character (case insensitive).
21 *
22 * @author Curt Arnold
23 */
24 public final class CaseInsensitiveLetterState
25 extends AbstractParserState
26 {
27 /**
28 * Next state if a match is found.
29 */
30 private final AbstractParserState nextState;
31
32 /**
33 * Next state if not match is found.
34 */
35 private final AbstractParserState noMatchState;
36
37 /**
38 * Lower case version of character to match.
39 */
40 private final char lowerLetter;
41
42 /**
43 * Lower case version of character to match.
44 */
45 private final char upperLetter;
46
47 /**
48 * Constructor.
49 *
50 * @param parser parser
51 * @param matchLetter letter to match
52 * @param nextStateArg next state if a match on the letter
53 * @param noMatchStateArg state if no match on letter
54 */
55 public CaseInsensitiveLetterState( final AbstractParser parser, final char matchLetter,
56 final AbstractParserState nextStateArg, final AbstractParserState noMatchStateArg )
57 {
58 super( parser );
59 this.lowerLetter = Character.toLowerCase( matchLetter );
60 this.upperLetter = Character.toUpperCase( matchLetter );
61 this.nextState = nextStateArg;
62 this.noMatchState = noMatchStateArg;
63 }
64
65 /**
66 * Consumes a character and returns the next state for the parser.
67 *
68 * @param ch next character
69 * @return the configured nextState if ch is the expected character or the configure noMatchState otherwise.
70 */
71 public AbstractParserState consume( final char ch )
72 {
73 if ( ch == lowerLetter || ch == upperLetter )
74 {
75 return nextState;
76 }
77 if ( ch == '\n' )
78 {
79 getParser().getNewLineState();
80 }
81 return noMatchState;
82 }
83 }