001: /*
002: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
003: *
004: * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
005: *
006: * The contents of this file are subject to the terms of either the GNU
007: * General Public License Version 2 only ("GPL") or the Common
008: * Development and Distribution License("CDDL") (collectively, the
009: * "License"). You may not use this file except in compliance with the
010: * License. You can obtain a copy of the License at
011: * http://www.netbeans.org/cddl-gplv2.html
012: * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
013: * specific language governing permissions and limitations under the
014: * License. When distributing the software, include this License Header
015: * Notice in each file and include the License file at
016: * nbbuild/licenses/CDDL-GPL-2-CP. Sun designates this
017: * particular file as subject to the "Classpath" exception as provided
018: * by Sun in the GPL Version 2 section of the License file that
019: * accompanied this code. If applicable, add the following below the
020: * License Header, with the fields enclosed by brackets [] replaced by
021: * your own identifying information:
022: * "Portions Copyrighted [year] [name of copyright owner]"
023: *
024: * If you wish your version of this file to be governed by only the CDDL
025: * or only the GPL Version 2, indicate your decision by adding
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027: * under the [CDDL or GPL Version 2] license." If you do not indicate a
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029: * your version of this file under either the CDDL, the GPL Version 2 or
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031: * However, if you add GPL Version 2 code and therefore, elected the GPL
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034: *
035: * Contributor(s):
036: *
037: * Portions Copyrighted 2008 Sun Microsystems, Inc.
038: */
039: package org.netbeans.modules.css.editor;
040:
041: import java.util.List;
042: import javax.swing.text.Document;
043: import org.netbeans.api.lexer.TokenHierarchy;
044: import org.netbeans.api.lexer.TokenSequence;
045: import org.netbeans.modules.css.lexer.api.CSSTokenId;
046:
047: /**
048: *
049: * @author marek
050: */
051: public class LexerUtils {
052:
053: public static TokenSequence getCssTokenSequence(Document doc,
054: int offset) {
055: TokenHierarchy hi = TokenHierarchy.get(doc);
056:
057: //if we are at the border of the tokensequence then,
058: //try to look ahead
059: TokenSequence ts = tokenSequenceList(hi, offset, false);
060:
061: //and back
062: if (ts == null) {
063: ts = tokenSequenceList(hi, offset, true);
064: }
065:
066: if (ts == null) {
067: //token sequence neither in forward nor in backward direction, give up
068: return null;
069: }
070:
071: //check boundaries of the token sequence - if the skip lenghts are used the token
072: //sequence is returned even for offsets outside of the tokenSequence content
073:
074: //test beginning
075: ts.moveStart();
076: if (ts.moveNext()) {
077: if (ts.offset() > offset) {
078: return null;
079: }
080: }
081:
082: //test end
083: ts.moveEnd();
084: if (ts.movePrevious()) {
085: if (ts.offset() + ts.token().length() < offset) {
086: return null;
087: }
088: }
089:
090: //seems to be ok
091: return ts;
092:
093: }
094:
095: private static TokenSequence tokenSequenceList(TokenHierarchy hi,
096: int offset, boolean backwardBias) {
097: List<TokenSequence> tsl = hi.embeddedTokenSequences(offset,
098: backwardBias);
099: if (tsl.size() > 0) {
100: TokenSequence ts = tsl.get(tsl.size() - 1);
101: if (ts.language() != CSSTokenId.language()) {
102: return null;
103: } else {
104: return ts;
105: }
106: }
107: return null;
108: }
109: }
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