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1 | /******************************************************************************* |
2 | * Copyright (c) 2000, 2011 IBM Corporation and others. | |
3 | * All rights reserved. This program and the accompanying materials | |
4 | * are made available under the terms of the Eclipse Public License v1.0 | |
5 | * which accompanies this distribution, and is available at | |
6 | * http://www.eclipse.org/legal/epl-v10.html | |
7 | * | |
8 | * Contributors: | |
9 | * IBM Corporation - initial API and implementation | |
10 | *******************************************************************************/ | |
11 | package org.eclipse.jdt.internal.ui.text.template.contentassist; | |
12 | ||
13 | import java.util.ArrayList; | |
14 | import java.util.HashMap; | |
15 | import java.util.Iterator; | |
16 | import java.util.Map; | |
17 | import java.util.Map.Entry; | |
18 | ||
19 | import org.eclipse.swt.graphics.Image; | |
20 | import org.eclipse.swt.graphics.Point; | |
21 | ||
22 | import org.eclipse.core.runtime.Assert; | |
23 | ||
24 | import org.eclipse.jface.text.BadLocationException; | |
25 | import org.eclipse.jface.text.IDocument; | |
26 | import org.eclipse.jface.text.IRegion; | |
27 | import org.eclipse.jface.text.ITextViewer; | |
28 | import org.eclipse.jface.text.Position; | |
29 | import org.eclipse.jface.text.Region; | |
30 | import org.eclipse.jface.text.templates.GlobalTemplateVariables; | |
31 | import org.eclipse.jface.text.templates.Template; | |
32 | import org.eclipse.jface.text.templates.TemplateContextType; | |
33 | ||
34 | import org.eclipse.jdt.core.ICompilationUnit; | |
35 | ||
36 | import org.eclipse.jdt.internal.corext.template.java.CompilationUnitContext; | |
37 | import org.eclipse.jdt.internal.corext.template.java.CompilationUnitContextType; | |
38 | import org.eclipse.jdt.internal.corext.template.java.SWTContextType; | |
39 | ||
40 | import org.eclipse.jdt.internal.ui.JavaPlugin; | |
41 | import org.eclipse.jdt.internal.ui.JavaPluginImages; | |
42 | ||
43 | ||
44 | public class TemplateEngine { | |
45 | ||
46 | private static final String $_LINE_SELECTION= "${" + GlobalTemplateVariables.LineSelection.NAME + "}"; //$NON-NLS-1$ //$NON-NLS-2$ | |
47 | private static final String $_WORD_SELECTION= "${" + GlobalTemplateVariables.WordSelection.NAME + "}"; //$NON-NLS-1$ //$NON-NLS-2$ | |
48 | ||
49 | /** The context type. */ | |
50 | private TemplateContextType fContextType; | |
51 | /** The result proposals. */ | |
52 | private ArrayList<TemplateProposal> fProposals= new ArrayList<TemplateProposal>(); | |
53 | /** Positions created on the key documents to remove in reset. */ | |
54 | private final Map<IDocument, Position> fPositions= new HashMap<IDocument, Position>(); | |
55 | ||
56 | /** | |
57 | * Creates the template engine for the given <code>contextType</code>. | |
58 | * <p> | |
59 | * The <code>JavaPlugin.getDefault().getTemplateContextRegistry()</code> | |
60 | * defines the supported context types.</p> | |
61 | * | |
62 | * @param contextType the context type | |
63 | */ | |
64 | public TemplateEngine(TemplateContextType contextType) { | |
65 | Assert.isNotNull(contextType); | |
66 | fContextType= contextType; | |
67 | } | |
68 | ||
69 | /** | |
70 | * Empties the collector. | |
71 | */ | |
72 | public void reset() { | |
73 | fProposals.clear(); | |
74 | for (Iterator<Entry<IDocument, Position>> it= fPositions.entrySet().iterator(); it.hasNext();) { | |
75 | Entry<IDocument, Position> entry= it.next(); | |
76 | IDocument doc= entry.getKey(); | |
77 | Position position= entry.getValue(); | |
78 | doc.removePosition(position); | |
79 | } | |
80 | fPositions.clear(); | |
81 | } | |
82 | ||
83 | /** | |
84 | * Returns the array of matching templates. | |
85 | * | |
86 | * @return the template proposals | |
87 | */ | |
88 | public TemplateProposal[] getResults() { | |
89 | return fProposals.toArray(new TemplateProposal[fProposals.size()]); | |
90 | } | |
91 | ||
92 | /** | |
93 | * Inspects the context of the compilation unit around <code>completionPosition</code> | |
94 | * and feeds the collector with proposals. | |
95 | * @param viewer the text viewer | |
96 | * @param completionPosition the context position in the document of the text viewer | |
97 | * @param compilationUnit the compilation unit (may be <code>null</code>) | |
98 | */ | |
99 | public void complete(ITextViewer viewer, int completionPosition, ICompilationUnit compilationUnit) { | |
100 | IDocument document= viewer.getDocument(); | |
101 | ||
102 | if (!(fContextType instanceof CompilationUnitContextType)) | |
103 | return; | |
104 | ||
105 | Point selection= viewer.getSelectedRange(); | |
106 | Position position= new Position(completionPosition, selection.y); | |
107 | ||
108 | // remember selected text | |
109 | String selectedText= null; | |
110 | if (selection.y != 0) { | |
111 | try { | |
112 | selectedText= document.get(selection.x, selection.y); | |
113 | document.addPosition(position); | |
114 | fPositions.put(document, position); | |
115 | } catch (BadLocationException e) {} | |
116 | } | |
117 | ||
118 | CompilationUnitContext context= ((CompilationUnitContextType) fContextType).createContext(document, position, compilationUnit); | |
119 | context.setVariable("selection", selectedText); //$NON-NLS-1$ | |
120 | int start= context.getStart(); | |
121 | int end= context.getEnd(); | |
122 | IRegion region= new Region(start, end - start); | |
123 | ||
124 | Template[] templates= JavaPlugin.getDefault().getTemplateStore().getTemplates(); | |
125 | ||
126 | if (selection.y == 0) { | |
127 | for (int i= 0; i != templates.length; i++) { | |
128 | Template template= templates[i]; | |
129 | if (context.canEvaluate(template)) { | |
130 | fProposals.add(new TemplateProposal(template, context, region, getImage())); | |
131 | } | |
132 | } | |
133 | } else { | |
134 | ||
135 | context.generated_551997803931588642(); | |
136 | ||
137 | boolean multipleLinesSelected= areMultipleLinesSelected(viewer); | |
138 | ||
139 | for (int i= 0; i != templates.length; i++) { | |
140 | Template template= templates[i]; | |
141 | if (context.canEvaluate(template) && | |
142 | (!multipleLinesSelected && template.getPattern().indexOf($_WORD_SELECTION) != -1 || (multipleLinesSelected && template.getPattern().indexOf($_LINE_SELECTION) != -1))) | |
143 | { | |
144 | fProposals.add(new TemplateProposal(templates[i], context, region, getImage())); | |
145 | } | |
146 | } | |
147 | } | |
148 | } | |
149 | ||
150 | private Image getImage() { | |
151 | if (fContextType instanceof SWTContextType) | |
152 | return JavaPluginImages.get(JavaPluginImages.IMG_OBJS_SWT_TEMPLATE); | |
153 | else | |
154 | return JavaPluginImages.get(JavaPluginImages.IMG_OBJS_TEMPLATE); | |
155 | } | |
156 | ||
157 | /** | |
158 | * Returns <code>true</code> if one line is completely selected or if multiple lines are selected. | |
159 | * Being completely selected means that all characters except the new line characters are | |
160 | * selected. | |
161 | * | |
162 | * @param viewer the text viewer | |
163 | * @return <code>true</code> if one or multiple lines are selected | |
164 | * @since 2.1 | |
165 | */ | |
166 | private boolean areMultipleLinesSelected(ITextViewer viewer) { | |
167 | if (viewer == null) | |
168 | return false; | |
169 | ||
170 | Point s= viewer.getSelectedRange(); | |
171 | if (s.y == 0) | |
172 | return false; | |
173 | ||
174 | try { | |
175 | ||
176 | IDocument document= viewer.getDocument(); | |
177 | int startLine= document.getLineOfOffset(s.x); | |
178 | int endLine= document.getLineOfOffset(s.x + s.y); | |
179 | IRegion line= document.getLineInformation(startLine); | |
180 | return startLine != endLine || (s.x == line.getOffset() && s.y == line.getLength()); | |
181 | ||
182 | } catch (BadLocationException x) { | |
183 | return false; | |
184 | } | |
185 | } | |
186 | } |