| /******************************************************************************* |
| * Copyright (c) 2000, 2011 IBM Corporation and others. |
| * 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: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jdt.internal.ui.text.template.contentassist; |
| |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.Map; |
| import java.util.Set; |
| |
| import org.eclipse.swt.graphics.Image; |
| import org.eclipse.swt.graphics.Point; |
| |
| import org.eclipse.core.runtime.Assert; |
| |
| import org.eclipse.jface.text.BadLocationException; |
| import org.eclipse.jface.text.DocumentEvent; |
| import org.eclipse.jface.text.IDocument; |
| import org.eclipse.jface.text.ITextViewer; |
| import org.eclipse.jface.text.contentassist.ICompletionProposal; |
| import org.eclipse.jface.text.contentassist.ICompletionProposalExtension2; |
| import org.eclipse.jface.text.contentassist.IContextInformation; |
| |
| |
| /** |
| * Global state for templates. Selecting a proposal for the master template variable |
| * will cause the value (and the proposals) for the slave variables to change. |
| * |
| * @see MultiVariable |
| */ |
| public class MultiVariableGuess { |
| |
| /** |
| * Implementation of the <code>ICompletionProposal</code> interface and extension. |
| */ |
| private static class Proposal implements ICompletionProposal, ICompletionProposalExtension2 { |
| |
| /** The string to be displayed in the completion proposal popup */ |
| private String fDisplayString; |
| /** The replacement string */ |
| String fReplacementString; |
| /** The replacement offset */ |
| private int fReplacementOffset; |
| /** The replacement length */ |
| private int fReplacementLength; |
| /** The cursor position after this proposal has been applied */ |
| private int fCursorPosition; |
| /** The image to be displayed in the completion proposal popup */ |
| private Image fImage; |
| /** The context information of this proposal */ |
| private IContextInformation fContextInformation; |
| /** The additional info of this proposal */ |
| private String fAdditionalProposalInfo; |
| |
| /** |
| * Creates a new completion proposal based on the provided information. The replacement string is |
| * considered being the display string too. All remaining fields are set to <code>null</code>. |
| * |
| * @param replacementString the actual string to be inserted into the document |
| * @param replacementOffset the offset of the text to be replaced |
| * @param replacementLength the length of the text to be replaced |
| * @param cursorPosition the position of the cursor following the insert relative to replacementOffset |
| */ |
| public Proposal(String replacementString, int replacementOffset, int replacementLength, int cursorPosition) { |
| this(replacementString, replacementOffset, replacementLength, cursorPosition, null, null, null, null); |
| } |
| |
| /** |
| * Creates a new completion proposal. All fields are initialized based on the provided information. |
| * |
| * @param replacementString the actual string to be inserted into the document |
| * @param replacementOffset the offset of the text to be replaced |
| * @param replacementLength the length of the text to be replaced |
| * @param cursorPosition the position of the cursor following the insert relative to replacementOffset |
| * @param image the image to display for this proposal |
| * @param displayString the string to be displayed for the proposal |
| * @param contextInformation the context information associated with this proposal |
| * @param additionalProposalInfo the additional information associated with this proposal |
| */ |
| public Proposal(String replacementString, int replacementOffset, int replacementLength, int cursorPosition, Image image, String displayString, IContextInformation contextInformation, String additionalProposalInfo) { |
| Assert.isNotNull(replacementString); |
| Assert.isTrue(replacementOffset >= 0); |
| Assert.isTrue(replacementLength >= 0); |
| Assert.isTrue(cursorPosition >= 0); |
| |
| fReplacementString= replacementString; |
| fReplacementOffset= replacementOffset; |
| fReplacementLength= replacementLength; |
| fCursorPosition= cursorPosition; |
| fImage= image; |
| fDisplayString= displayString; |
| fContextInformation= contextInformation; |
| fAdditionalProposalInfo= additionalProposalInfo; |
| } |
| |
| /* |
| * @see ICompletionProposal#apply(IDocument) |
| */ |
| public void apply(IDocument document) { |
| try { |
| document.replace(fReplacementOffset, fReplacementLength, fReplacementString); |
| } catch (BadLocationException x) { |
| // ignore |
| } |
| } |
| |
| /* |
| * @see ICompletionProposal#getSelection(IDocument) |
| */ |
| public Point getSelection(IDocument document) { |
| return new Point(fReplacementOffset + fCursorPosition, 0); |
| } |
| |
| /* |
| * @see ICompletionProposal#getContextInformation() |
| */ |
| public IContextInformation getContextInformation() { |
| return fContextInformation; |
| } |
| |
| /* |
| * @see ICompletionProposal#getImage() |
| */ |
| public Image getImage() { |
| return fImage; |
| } |
| |
| /* |
| * @see ICompletionProposal#getDisplayString() |
| */ |
| public String getDisplayString() { |
| if (fDisplayString != null) |
| return fDisplayString; |
| return fReplacementString; |
| } |
| |
| /* |
| * @see ICompletionProposal#getAdditionalProposalInfo() |
| */ |
| public String getAdditionalProposalInfo() { |
| return fAdditionalProposalInfo; |
| } |
| |
| /* |
| * @see org.eclipse.jface.text.contentassist.ICompletionProposalExtension2#apply(org.eclipse.jface.text.ITextViewer, char, int, int) |
| */ |
| public void apply(ITextViewer viewer, char trigger, int stateMask, int offset) { |
| apply(viewer.getDocument()); |
| } |
| |
| /* |
| * @see org.eclipse.jface.text.contentassist.ICompletionProposalExtension2#selected(org.eclipse.jface.text.ITextViewer, boolean) |
| */ |
| public void selected(ITextViewer viewer, boolean smartToggle) { |
| } |
| |
| /* |
| * @see org.eclipse.jface.text.contentassist.ICompletionProposalExtension2#unselected(org.eclipse.jface.text.ITextViewer) |
| */ |
| public void unselected(ITextViewer viewer) { |
| } |
| |
| /* |
| * @see org.eclipse.jface.text.contentassist.ICompletionProposalExtension2#validate(org.eclipse.jface.text.IDocument, int, org.eclipse.jface.text.DocumentEvent) |
| */ |
| public boolean validate(IDocument document, int offset, DocumentEvent event) { |
| try { |
| String content= document.get(fReplacementOffset, fReplacementLength); |
| if (content.startsWith(fReplacementString)) |
| return true; |
| } catch (BadLocationException e) { |
| // ignore concurrently modified document |
| } |
| return false; |
| } |
| } |
| |
| private final Map<MultiVariable, Set<MultiVariable>> fDependencies= new HashMap<MultiVariable, Set<MultiVariable>>(); |
| private final Map<MultiVariable, MultiVariable> fBackwardDeps= new HashMap<MultiVariable, MultiVariable>(); |
| private final Map<MultiVariable, VariablePosition> fPositions= new HashMap<MultiVariable, VariablePosition>(); |
| |
| public MultiVariableGuess() { |
| } |
| |
| public ICompletionProposal[] getProposals(final MultiVariable variable, int offset, int length) { |
| MultiVariable master= fBackwardDeps.get(variable); |
| Object[] choices; |
| if (master == null) |
| choices= variable.getChoices(); |
| else |
| choices= variable.getChoices(master.getCurrentChoice()); |
| |
| if (choices == null) |
| return null; |
| |
| if (fDependencies.containsKey(variable)) { |
| ICompletionProposal[] ret= new ICompletionProposal[choices.length]; |
| for (int i= 0; i < ret.length; i++) { |
| final Object choice= choices[i]; |
| ret[i]= new Proposal(variable.toString(choice), offset, length, offset + length) { |
| @Override |
| public void apply(IDocument document) { |
| super.apply(document); |
| Object oldChoice= variable.getCurrentChoice(); |
| variable.setCurrentChoice(choice); |
| updateSlaves(variable, document, oldChoice); |
| } |
| }; |
| } |
| |
| return ret; |
| |
| } else { |
| if (choices.length < 2) |
| return null; |
| |
| ICompletionProposal[] ret= new ICompletionProposal[choices.length]; |
| for (int i= 0; i < ret.length; i++) |
| ret[i]= new Proposal(variable.toString(choices[i]), offset, length, offset + length); |
| |
| return ret; |
| } |
| } |
| |
| private void updateSlaves(MultiVariable variable, IDocument document, Object oldChoice) { |
| Object choice= variable.getCurrentChoice(); |
| if (!oldChoice.equals(choice)) { |
| Set<MultiVariable> slaves= fDependencies.get(variable); |
| for (Iterator<MultiVariable> it= slaves.iterator(); it.hasNext();) { |
| MultiVariable slave= it.next(); |
| VariablePosition pos= fPositions.get(slave); |
| |
| Object slavesOldChoice= slave.getCurrentChoice(); |
| slave.setKey(choice); // resets the current choice |
| try { |
| document.replace(pos.getOffset(), pos.getLength(), slave.getDefaultValue()); |
| } catch (BadLocationException x) { |
| // ignore and continue |
| } |
| // handle slaves recursively |
| if (fDependencies.containsKey(slave)) |
| updateSlaves(slave, document, slavesOldChoice); |
| } |
| } |
| } |
| |
| /** |
| * @param position |
| */ |
| public void addSlave(VariablePosition position) { |
| fPositions.put(position.getVariable(), position); |
| } |
| |
| /** |
| * @param master |
| * @param slave |
| * @since 3.3 |
| */ |
| public void addDependency(MultiVariable master, MultiVariable slave) { |
| // check for cycles and multi-slaves |
| if (fBackwardDeps.containsKey(slave)) |
| throw new IllegalArgumentException("slave can only serve one master"); //$NON-NLS-1$ |
| Object parent= master; |
| while (parent != null) { |
| parent= fBackwardDeps.get(parent); |
| if (parent == slave) |
| throw new IllegalArgumentException("cycle detected"); //$NON-NLS-1$ |
| } |
| |
| Set<MultiVariable> slaves= fDependencies.get(master); |
| if (slaves == null) { |
| slaves= new HashSet<MultiVariable>(); |
| fDependencies.put(master, slaves); |
| } |
| fBackwardDeps.put(slave, master); |
| slaves.add(slave); |
| } |
| } |