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AbstractLangScanner.java
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AbstractLangScanner.java
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/*******************************************************************************
* Copyright (c) 2015 Bruno Medeiros and other Contributors.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Bruno Medeiros - initial API and implementation
*******************************************************************************/
package melnorme.lang.ide.ui.text;
import static melnorme.utilbox.core.Assert.AssertNamespace.assertNotNull;
import static melnorme.utilbox.core.Assert.AssertNamespace.assertTrue;
import org.eclipse.jface.text.rules.ICharacterScanner;
import org.eclipse.jface.text.rules.IRule;
import org.eclipse.jface.text.rules.IToken;
import org.eclipse.jface.text.rules.IWhitespaceDetector;
import org.eclipse.jface.text.rules.IWordDetector;
import org.eclipse.jface.text.rules.Token;
import melnorme.lang.ide.core_text.BufferedRuleBasedScannerExt;
import melnorme.lang.ide.core_text.CharacterScanner_ReaderHelper;
import melnorme.lang.ide.ui.text.coloring.ILangTokenScanner;
import melnorme.lang.ide.ui.text.coloring.ThemedTextStylingPreference;
import melnorme.lang.ide.ui.text.coloring.TokenRegistry;
import melnorme.lang.tooling.parser.lexer.ILexingRule2;
import melnorme.utilbox.collections.ArrayList2;
public abstract class AbstractLangScanner extends BufferedRuleBasedScannerExt implements ILangTokenScanner {
protected final TokenRegistry tokenRegistry;
public AbstractLangScanner(TokenRegistry tokenRegistry) {
this.tokenRegistry = assertNotNull(tokenRegistry);
ArrayList2<IRule> arrayList2 = new ArrayList2<>();
initRules(arrayList2);
setRules(arrayList2.toArray(IRule.class));
}
public IToken getToken(ThemedTextStylingPreference stylingPref) {
return tokenRegistry.getToken(stylingPref);
}
/* ----------------- ----------------- */
protected abstract void initRules(ArrayList2<IRule> rules);
/* ----------------- ----------------- */
@Override
public IToken nextToken() {
// tokenStore.ensureTokensInitialised();
return doNextToken();
}
protected IToken doNextToken() {
fTokenOffset= fOffset;
fColumn= UNDEFINED;
for(int i = 0; i < fRules.length; i++) {
fOffset = fTokenOffset; // Revert position changes that rules might have changed
IToken token = fRules[i].evaluate(this);
if(!token.isUndefined()) {
return token;
}
}
if (read() == EOF)
return Token.EOF;
return fDefaultReturnToken;
}
/* ----------------- ----------------- */
public class LexingRule_RuleAdapter implements IRule {
protected final ILexingRule2<IToken> codeLexerRule;
public LexingRule_RuleAdapter(ILexingRule2<IToken> codeLexerRule) {
this.codeLexerRule = codeLexerRule;
}
@Override
public IToken evaluate(ICharacterScanner scanner) {
AbstractLangScanner langScanner = AbstractLangScanner.this;
assertTrue(scanner == langScanner);
CharacterScanner_ReaderHelper readerHelper = new CharacterScanner_ReaderHelper(langScanner);
IToken token = codeLexerRule.evaluateToken(readerHelper);
if(token == null) {
return Token.UNDEFINED;
}
return token;
}
}
/* ----------------- Helpers ----------------- */
public static class LangWhitespaceDetector implements IWhitespaceDetector {
@Override
public boolean isWhitespace(char character) {
return Character.isWhitespace(character);
}
}
public static class JavaWordDetector implements IWordDetector {
@Override
public boolean isWordPart(char character) {
return Character.isJavaIdentifierPart(character);
}
@Override
public boolean isWordStart(char character) {
return Character.isJavaIdentifierStart(character);
}
}
}