1 /*
2 *
3 * Copyright 2002-2004 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) or whitespace.
21 *
22 * @author Curt Arnold
23 */
24 public final class WhitespaceOrCaseInsensitiveLetterState
25 extends AbstractParserState
26 {
27 /**
28 * Next state if the character is found.
29 */
30 private final AbstractParserState nextState;
31
32 /**
33 * Character to match (lower case).
34 */
35 private final char lowerLetter;
36
37 /**
38 * Character to match (upper case).
39 */
40 private final char upperLetter;
41
42 /**
43 * Constructor.
44 *
45 * @param parser parser
46 * @param matchLetter letter to match
47 * @param nextStateArg next state if a match on the letter
48 */
49 public WhitespaceOrCaseInsensitiveLetterState( final AbstractParser parser, final char matchLetter,
50 final AbstractParserState nextStateArg )
51 {
52 super( parser );
53 this.lowerLetter = Character.toLowerCase( matchLetter );
54 this.upperLetter = Character.toUpperCase( matchLetter );
55 this.nextState = nextStateArg;
56 }
57
58 /**
59 * Consumes a character and returns the next state for the parser.
60 *
61 * @param ch next character
62 * @return the configured nextState if ch is the expected character or the configure noMatchState otherwise.
63 */
64 public AbstractParserState consume( final char ch )
65 {
66 if ( ch == lowerLetter || ch == upperLetter )
67 {
68 return nextState;
69 }
70 if ( ch == ' ' || ch == '\t' )
71 {
72 return this;
73 }
74 if ( ch == '\n' )
75 {
76 getParser().getNewLineState();
77 }
78 return null;
79 }
80 }