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 or whitespace.
21 *
22 * @author Curt Arnold
23 */
24 public final class WhitespaceOrLetterState
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.
34 */
35 private final char thisLetter;
36
37 /**
38 * Constructor.
39 *
40 * @param parser parser
41 * @param matchLetter letter to match
42 * @param nextStateArg next state if a match on the letter
43 */
44 public WhitespaceOrLetterState( final AbstractParser parser, final char matchLetter,
45 final AbstractParserState nextStateArg )
46 {
47 super( parser );
48 this.thisLetter = matchLetter;
49 this.nextState = nextStateArg;
50 }
51
52 /**
53 * Consumes a character and returns the next state for the parser.
54 *
55 * @param ch next character @returns the configured nextState if ch is the expected character or the configure
56 * noMatchState otherwise.
57 * @return next state
58 */
59 public AbstractParserState consume( final char ch )
60 {
61 if ( ch == thisLetter )
62 {
63 return nextState;
64 }
65 if ( ch == ' ' || ch == '\t' )
66 {
67 return this;
68 }
69 if ( ch == '\n' )
70 {
71 getParser().getNewLineState();
72 }
73 return null;
74 }
75 }