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comparison dwtx/jface/text/rules/RuleBasedPartitionScanner.d @ 129:eb30df5ca28b

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Added JFace Text sources
author Frank Benoit <benoit@tionex.de>
date Sat, 23 Aug 2008 19:10:48 +0200
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children c4fb132a086c
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128:8df1d4193877 129:eb30df5ca28b
1 /*******************************************************************************
2 * Copyright (c) 2000, 2006 IBM Corporation and others.
3 * All rights reserved. This program and the accompanying materials
4 * are made available under the terms of the Eclipse Public License v1.0
5 * which accompanies this distribution, and is available at
6 * http://www.eclipse.org/legal/epl-v10.html
7 *
8 * Contributors:
9 * IBM Corporation - initial API and implementation
10 * Port to the D programming language:
11 * Frank Benoit <benoit@tionex.de>
12 *******************************************************************************/
13
14 module dwtx.jface.text.rules.RuleBasedPartitionScanner;
15
16 import dwt.dwthelper.utils;
17
18
19 import dwtx.jface.text.IDocument;
20
21
22 /**
23 * Scanner that exclusively uses predicate rules.
24 * @since 2.0
25 */
26 public class RuleBasedPartitionScanner : BufferedRuleBasedScanner , IPartitionTokenScanner {
27
28 /** The content type of the partition in which to resume scanning. */
29 protected String fContentType;
30 /** The offset of the partition inside which to resume. */
31 protected int fPartitionOffset;
32
33
34 /**
35 * Disallow setting the rules since this scanner
36 * exclusively uses predicate rules.
37 *
38 * @param rules the sequence of rules controlling this scanner
39 */
40 public void setRules(IRule[] rules) {
41 throw new UnsupportedOperationException();
42 }
43
44 /*
45 * @see RuleBasedScanner#setRules(IRule[])
46 */
47 public void setPredicateRules(IPredicateRule[] rules) {
48 super.setRules(rules);
49 }
50
51 /*
52 * @see ITokenScanner#setRange(IDocument, int, int)
53 */
54 public void setRange(IDocument document, int offset, int length) {
55 setPartialRange(document, offset, length, null, -1);
56 }
57
58 /*
59 * @see IPartitionTokenScanner#setPartialRange(IDocument, int, int, String, int)
60 */
61 public void setPartialRange(IDocument document, int offset, int length, String contentType, int partitionOffset) {
62 fContentType= contentType;
63 fPartitionOffset= partitionOffset;
64 if (partitionOffset > -1) {
65 int delta= offset - partitionOffset;
66 if (delta > 0) {
67 super.setRange(document, partitionOffset, length + delta);
68 fOffset= offset;
69 return;
70 }
71 }
72 super.setRange(document, offset, length);
73 }
74
75 /*
76 * @see ITokenScanner#nextToken()
77 */
78 public IToken nextToken() {
79
80
81 if (fContentType is null || fRules is null) {
82 //don't try to resume
83 return super.nextToken();
84 }
85
86 // inside a partition
87
88 fColumn= UNDEFINED;
89 bool resume= (fPartitionOffset > -1 && fPartitionOffset < fOffset);
90 fTokenOffset= resume ? fPartitionOffset : fOffset;
91
92 IPredicateRule rule;
93 IToken token;
94
95 for (int i= 0; i < fRules.length; i++) {
96 rule= (IPredicateRule) fRules[i];
97 token= rule.getSuccessToken();
98 if (fContentType.equals(token.getData())) {
99 token= rule.evaluate(this, resume);
100 if (!token.isUndefined()) {
101 fContentType= null;
102 return token;
103 }
104 }
105 }
106
107 // haven't found any rule for this type of partition
108 fContentType= null;
109 if (resume)
110 fOffset= fPartitionOffset;
111 return super.nextToken();
112 }
113 }