| /******************************************************************************* |
| * Copyright (c) 2016, 2019 Red Hat Inc. and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * Mickael Istria (Red Hat Inc.) |
| * Stephan Wahlbrink <sw@wahlbrink.eu> - Bug 512251 - Fix IllegalArgumentException in ContextInformationPopup |
| *******************************************************************************/ |
| |
| package org.eclipse.jface.text.tests.contentassist; |
| |
| import java.util.Arrays; |
| |
| import org.eclipse.swt.graphics.Image; |
| |
| import org.eclipse.jface.text.BadLocationException; |
| import org.eclipse.jface.text.IDocument; |
| import org.eclipse.jface.text.IRegion; |
| import org.eclipse.jface.text.ITextViewer; |
| import org.eclipse.jface.text.contentassist.CompletionProposal; |
| import org.eclipse.jface.text.contentassist.ICompletionProposal; |
| import org.eclipse.jface.text.contentassist.IContentAssistProcessorExtension; |
| import org.eclipse.jface.text.contentassist.IContextInformation; |
| import org.eclipse.jface.text.contentassist.IContextInformationExtension; |
| import org.eclipse.jface.text.contentassist.IContextInformationValidator; |
| |
| |
| public class BarContentAssistProcessor implements IContentAssistProcessorExtension { |
| |
| public static final String PROPOSAL= "bars are good for a beer."; |
| |
| protected static class BarContextInformation implements IContextInformation, IContextInformationExtension { |
| |
| private String contextDisplayString; |
| |
| private String informationDisplayString; |
| |
| private int offset; |
| |
| public BarContextInformation(String contextDisplayString, String informationDisplayString, int offset) { |
| this.contextDisplayString= contextDisplayString; |
| this.informationDisplayString= informationDisplayString; |
| this.offset= offset; |
| } |
| |
| @Override |
| public String getContextDisplayString() { |
| return contextDisplayString; |
| } |
| |
| @Override |
| public Image getImage() { |
| return null; |
| } |
| |
| @Override |
| public String getInformationDisplayString() { |
| return informationDisplayString; |
| } |
| |
| @Override |
| public int getContextInformationPosition() { |
| return offset; |
| } |
| |
| } |
| |
| protected static class ContextInformationValidator implements IContextInformationValidator { |
| |
| protected BarContextInformation info; |
| |
| protected ITextViewer viewer; |
| |
| protected int offset; |
| |
| @Override |
| public void install(IContextInformation info, ITextViewer viewer, int offset) { |
| if (info instanceof BarContextInformation) { |
| this.info= (BarContextInformation) info; |
| } |
| this.viewer= viewer; |
| this.offset= offset; |
| } |
| |
| @Override |
| public boolean isContextInformationValid(int offset) { |
| if (this.info == null) { |
| return false; |
| } |
| try { |
| IDocument document= viewer.getDocument(); |
| IRegion line= document.getLineInformationOfOffset(this.offset); |
| int end= line.getOffset() + line.getLength(); |
| return (offset >= this.offset && offset < end); |
| } catch (BadLocationException e) { |
| return false; |
| } |
| } |
| } |
| |
| |
| private final String completeString; |
| |
| private char activationChar; |
| |
| public BarContentAssistProcessor() { |
| this(PROPOSAL); |
| } |
| |
| public BarContentAssistProcessor(String completeString) { |
| this.completeString= completeString; |
| } |
| |
| @Override |
| public ICompletionProposal[] computeCompletionProposals(ITextViewer viewer, int offset) { |
| for (int offsetInProposal= Math.min(this.completeString.length(), viewer.getDocument().getLength()); offsetInProposal > 0; offsetInProposal--) { |
| String maybeMatchingString= this.completeString.substring(0, offsetInProposal); |
| try { |
| int lastIndex= offset - offsetInProposal + this.completeString.length(); |
| if (offset >= offsetInProposal && viewer.getDocument().get(offset - offsetInProposal, maybeMatchingString.length()).equals(maybeMatchingString)) { |
| CompletionProposal proposal= new CompletionProposal(this.completeString.substring(offsetInProposal), offset, 0, lastIndex); |
| return new ICompletionProposal[] { proposal }; |
| } |
| } catch (BadLocationException e) { |
| e.printStackTrace(); |
| } |
| } |
| return new ICompletionProposal[0]; |
| } |
| |
| @Override |
| public char[] getCompletionProposalAutoActivationCharacters() { |
| return null; |
| } |
| |
| @Override |
| public char[] getContextInformationAutoActivationCharacters() { |
| return null; |
| } |
| |
| /** |
| * Creates context info "idx= <word index in #PROPOSAL>" at the end of a word. |
| **/ |
| @Override |
| public IContextInformation[] computeContextInformation(ITextViewer viewer, int offset) { |
| try { |
| IDocument document= viewer.getDocument(); |
| int wordBegin= offset; |
| while (wordBegin > 0 && Character.isLetterOrDigit(document.getChar(wordBegin - 1))) { |
| wordBegin--; |
| } |
| if (wordBegin < offset) { |
| String word= document.get(wordBegin, offset - wordBegin); |
| int wordIdx= Arrays.asList(completeString.split("\\W")).indexOf(word); |
| if (wordIdx >= 0) { |
| return new IContextInformation[] { |
| new BarContextInformation(word, "idx= " + wordIdx, wordBegin) |
| }; |
| } |
| } |
| } catch (BadLocationException e) { |
| e.printStackTrace(); |
| } |
| return null; |
| } |
| |
| @Override |
| public IContextInformationValidator getContextInformationValidator() { |
| return new ContextInformationValidator(); |
| } |
| |
| @Override |
| public String getErrorMessage() { |
| return null; |
| } |
| |
| @Override |
| public boolean isCompletionProposalAutoActivation(char c, ITextViewer viewer, int offset) { |
| return activationChar == c; |
| } |
| |
| @Override |
| public boolean isContextInformationAutoActivation(char c, ITextViewer viewer, int offset) { |
| return false; |
| } |
| |
| public void setCompletionProposalAutoActivationChar(char c) { |
| activationChar= c; |
| } |
| |
| } |