--- /dev/null
+/*******************************************************************************
+ * 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);
+ }
+}
git://git.uio.no / ifi-stolz-refaktor.git / blobdiff