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103 lines
3.5 KiB
Java
103 lines
3.5 KiB
Java
/**
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* Copyright (C) 2009 - 2021 <a href="https://www.wudsn.com" target="_top">Peter Dell</a>
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*
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* This file is part of WUDSN IDE.
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*
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* WUDSN IDE is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* WUDSN IDE is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with WUDSN IDE. If not, see <http://www.gnu.org/licenses/>.
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*/
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package com.wudsn.ide.lng.editor;
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import java.util.Set;
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import org.eclipse.jface.text.TextAttribute;
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import org.eclipse.jface.text.rules.RuleBasedScanner;
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import org.eclipse.jface.text.rules.Token;
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import com.wudsn.ide.lng.preferences.LanguagePreferences;
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import com.wudsn.ide.lng.preferences.LanguagePreferencesConstants;
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import com.wudsn.ide.lng.preferences.TextAttributeConverter;
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/**
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* Rule based scanner for comments and strings.
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*
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* @author Peter Dell
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* @author Daniel Mitte
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*/
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final class LanguageRuleBasedScanner extends RuleBasedScanner {
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// Key for preference store
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private String preferencesKey;
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// Default Token for the text attributes
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private Token defaultToken;
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/**
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* Creates a new instance. Called by {@link LanguageSourceViewerConfiguration}.
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*
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* @param languagePreferences The language preferences, not <code>null</code>.
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* @param preferencesKey The preferences key to listen to for text
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* attribute changes, not <code>null</code>. See
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* {@link LanguagePreferencesConstants}
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*/
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LanguageRuleBasedScanner(LanguagePreferences languagePreferences, String preferencesKey) {
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if (languagePreferences == null) {
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throw new IllegalArgumentException("Parameter 'language' must not be null.");
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}
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if (preferencesKey == null) {
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throw new IllegalArgumentException("Parameter 'preferencesKey' must not be null.");
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}
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this.preferencesKey = preferencesKey;
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defaultToken = new Token(languagePreferences.getTextAttribute(preferencesKey));
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super.setDefaultReturnToken(defaultToken);
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}
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/**
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* Dispose UI resources.
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*/
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final void dispose() {
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TextAttributeConverter.dispose((TextAttribute) defaultToken.getData());
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}
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/**
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* Update the token based on the preferences. Called by
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* {@link LanguageSourceViewerConfiguration}.
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*
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* @param preferences The preferences, not <code>null</code>.
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* @param changedPropertyNames The set of changed property names, not
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* <code>null</code>.
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*
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* @return <code>true</code> If the editor has to be refreshed.
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*/
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final boolean preferencesChanged(LanguagePreferences preferences, Set<String> changedPropertyNames) {
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if (preferences == null) {
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throw new IllegalArgumentException("Parameter 'preferences' must not be null.");
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}
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if (changedPropertyNames == null) {
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throw new IllegalArgumentException("Parameter 'changedPropertyNames' must not be null.");
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}
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boolean refresh = false;
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if (changedPropertyNames.contains(preferencesKey)) {
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TextAttributeConverter.dispose((TextAttribute) defaultToken.getData());
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defaultToken.setData(preferences.getTextAttribute(preferencesKey));
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refresh = true;
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}
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return refresh;
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}
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}
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