| /******************************************************************************* |
| * Copyright (c) 2000, 2015 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.jface.text.templates; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.eclipse.core.runtime.Assert; |
| |
| import org.eclipse.text.edits.MalformedTreeException; |
| import org.eclipse.text.edits.MultiTextEdit; |
| import org.eclipse.text.edits.RangeMarker; |
| import org.eclipse.text.edits.ReplaceEdit; |
| import org.eclipse.text.edits.TextEdit; |
| |
| import org.eclipse.jface.text.BadLocationException; |
| import org.eclipse.jface.text.Document; |
| import org.eclipse.jface.text.IDocument; |
| |
| |
| /** |
| * A context type defines a context within which templates are resolved. It |
| * stores a number of <code>TemplateVariableResolver</code>s. A |
| * <code>TemplateBuffer</code> can be resolved in a |
| * <code>TemplateContext</code> using the |
| * {@link #resolve(TemplateBuffer, TemplateContext)} method. |
| * <p> |
| * Clients may extend this class. |
| * </p> |
| * |
| * @since 3.0 |
| */ |
| public class TemplateContextType { |
| |
| /** The id of the context type. */ |
| private /* final */ String fId= null; |
| |
| /** Variable resolvers used by this content type. */ |
| private final Map<String, TemplateVariableResolver> fResolvers= new HashMap<>(); |
| |
| /** The name of the context type. */ |
| private String fName= null; |
| |
| /** |
| * Creates a context type with an identifier. The identifier must be unique, |
| * a qualified name is suggested. The id is also used as name. |
| * |
| * @param id the unique identifier of the context type |
| */ |
| public TemplateContextType(String id) { |
| this(id, id); |
| } |
| |
| /** |
| * Creates a context type with an identifier. The identifier must be unique, a qualified name is suggested. |
| * |
| * @param id the unique identifier of the context type |
| * @param name the name of the context type |
| */ |
| public TemplateContextType(String id, String name) { |
| Assert.isNotNull(id); |
| Assert.isNotNull(name); |
| fId= id; |
| fName= name; |
| } |
| |
| /** |
| * Returns the id of the context type. |
| * |
| * @return the id of the receiver |
| */ |
| public String getId() { |
| return fId; |
| } |
| |
| |
| /** |
| * Returns the name of the context type. |
| * |
| * @return the name of the context type |
| */ |
| public String getName() { |
| return fName; |
| } |
| |
| /** |
| * Creates a context type with a <code>null</code> identifier. |
| * <p> |
| * This is a framework-only constructor that exists only so that context |
| * types can be contributed via an extension point and that should not be |
| * called in client code except for subclass constructors; use |
| * {@link #TemplateContextType(String)} instead. |
| * </p> |
| */ |
| public TemplateContextType() { |
| } |
| |
| /** |
| * Sets the id of this context. |
| * <p> |
| * This is a framework-only method that exists solely so that context types |
| * can be contributed via an extension point and that should not be called |
| * in client code; use {@link #TemplateContextType(String)} instead. |
| * </p> |
| * |
| * @param id the identifier of this context |
| * @throws RuntimeException an unspecified exception if the id has already |
| * been set on this context type |
| */ |
| public final void setId(String id) throws RuntimeException { |
| Assert.isNotNull(id); |
| Assert.isTrue(fId == null); // may only be called once when the context is instantiated |
| fId= id; |
| } |
| |
| /** |
| * Sets the name of the context type. |
| * |
| * <p> |
| * This is a framework-only method that exists solely so that context types |
| * can be contributed via an extension point and that should not be called |
| * in client code; use {@link #TemplateContextType(String, String)} instead. |
| * </p> |
| * |
| * @param name the name of the context type |
| */ |
| public final void setName(String name) { |
| Assert.isTrue(fName == null); // only initialized by extension code |
| fName= name; |
| } |
| |
| /** |
| * Adds a variable resolver to the context type. If there already is a resolver |
| * for the same type, the previous one gets replaced by <code>resolver</code>. |
| * |
| * @param resolver the resolver to be added under its name |
| */ |
| public void addResolver(TemplateVariableResolver resolver) { |
| Assert.isNotNull(resolver); |
| fResolvers.put(resolver.getType(), resolver); |
| } |
| |
| /** |
| * Removes a template variable from the context type. |
| * |
| * @param resolver the variable to be removed |
| */ |
| public void removeResolver(TemplateVariableResolver resolver) { |
| Assert.isNotNull(resolver); |
| fResolvers.remove(resolver.getType()); |
| } |
| |
| /** |
| * Removes all template variables from the context type. |
| */ |
| public void removeAllResolvers() { |
| fResolvers.clear(); |
| } |
| |
| /** |
| * Returns an iterator for the variables known to the context type. |
| * |
| * @return an iterator over the variables in this context type |
| */ |
| public Iterator<TemplateVariableResolver> resolvers() { |
| return Collections.unmodifiableMap(fResolvers).values().iterator(); |
| } |
| |
| /** |
| * Returns the resolver for the given type. |
| * |
| * @param type the type for which a resolver is needed |
| * @return a resolver for the given type, or <code>null</code> if none is registered |
| */ |
| protected TemplateVariableResolver getResolver(String type) { |
| return fResolvers.get(type); |
| } |
| |
| /** |
| * Validates a pattern, a <code>TemplateException</code> is thrown if |
| * validation fails. |
| * |
| * @param pattern the template pattern to validate |
| * @throws TemplateException if the pattern is invalid |
| */ |
| public void validate(String pattern) throws TemplateException { |
| TemplateTranslator translator= new TemplateTranslator(); |
| TemplateBuffer buffer= translator.translate(pattern); |
| validateVariables(buffer.getVariables()); |
| } |
| |
| /** |
| * Validates the variables in this context type. If a variable is not valid, |
| * e.g. if its type is not known in this context type, a |
| * <code>TemplateException</code> is thrown. |
| * <p> |
| * The default implementation does nothing. |
| * </p> |
| * |
| * @param variables the variables to validate |
| * @throws TemplateException if one of the variables is not valid in this |
| * context type |
| */ |
| protected void validateVariables(TemplateVariable[] variables) throws TemplateException { |
| } |
| |
| /** |
| * Resolves the variables in <code>buffer</code> within <code>context</code> |
| * and edits the template buffer to reflect the resolved variables. |
| * |
| * @param buffer the template buffer |
| * @param context the template context |
| * @throws MalformedTreeException if the positions in the buffer overlap |
| * @throws BadLocationException if the buffer cannot be successfully modified |
| */ |
| public void resolve(TemplateBuffer buffer, TemplateContext context) throws MalformedTreeException, BadLocationException { |
| Assert.isNotNull(context); |
| TemplateVariable[] variables= buffer.getVariables(); |
| |
| List<RangeMarker> positions= variablesToPositions(variables); |
| List<ReplaceEdit> edits= new ArrayList<>(5); |
| |
| // iterate over all variables and try to resolve them |
| for (int i= 0; i != variables.length; i++) { |
| TemplateVariable variable= variables[i]; |
| |
| if (!variable.isResolved()) |
| resolve(variable, context); |
| |
| String value= variable.getDefaultValue(); |
| int[] offsets= variable.getOffsets(); |
| // update buffer to reflect new value |
| for (int k= 0; k != offsets.length; k++) |
| edits.add(new ReplaceEdit(offsets[k], variable.getInitialLength(), value)); |
| |
| } |
| |
| IDocument document= new Document(buffer.getString()); |
| MultiTextEdit edit= new MultiTextEdit(0, document.getLength()); |
| edit.addChildren(positions.toArray(new TextEdit[positions.size()])); |
| edit.addChildren(edits.toArray(new TextEdit[edits.size()])); |
| edit.apply(document, TextEdit.UPDATE_REGIONS); |
| |
| positionsToVariables(positions, variables); |
| |
| buffer.setContent(document.get(), variables); |
| } |
| |
| /** |
| * Resolves a single variable in a context. Resolving is delegated to the registered resolver. |
| * |
| * @param variable the variable to resolve |
| * @param context the context in which to resolve the variable |
| * @since 3.3 |
| */ |
| public void resolve(TemplateVariable variable, TemplateContext context) { |
| String type= variable.getType(); |
| TemplateVariableResolver resolver= fResolvers.get(type); |
| if (resolver == null) |
| resolver= new TemplateVariableResolver(type, ""); //$NON-NLS-1$ |
| resolver.resolve(variable, context); |
| } |
| |
| private static List<RangeMarker> variablesToPositions(TemplateVariable[] variables) { |
| List<RangeMarker> positions= new ArrayList<>(5); |
| for (int i= 0; i != variables.length; i++) { |
| int[] offsets= variables[i].getOffsets(); |
| for (int j= 0; j != offsets.length; j++) |
| positions.add(new RangeMarker(offsets[j], 0)); |
| } |
| |
| return positions; |
| } |
| |
| private static void positionsToVariables(List<RangeMarker> positions, TemplateVariable[] variables) { |
| Iterator<RangeMarker> iterator= positions.iterator(); |
| |
| for (int i= 0; i != variables.length; i++) { |
| TemplateVariable variable= variables[i]; |
| |
| int[] offsets= new int[variable.getOffsets().length]; |
| for (int j= 0; j != offsets.length; j++) |
| offsets[j]= iterator.next().getOffset(); |
| |
| variable.setOffsets(offsets); |
| } |
| } |
| } |