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1
11 package org.eclipse.jdt.internal.ui.text.java;
12
13
14 import java.util.ArrayList  ;
15 import java.util.List ;
16
17 import org.eclipse.core.runtime.Assert;
18
19 import org.eclipse.swt.SWT;
20 import org.eclipse.swt.custom.StyleRange;
21
22 import org.eclipse.jface.text.BadLocationException;
23 import org.eclipse.jface.text.IDocument;
24 import org.eclipse.jface.text.IRegion;
25 import org.eclipse.jface.text.ITextViewer;
26 import org.eclipse.jface.text.TextPresentation;
27 import org.eclipse.jface.text.contentassist.IContextInformation;
28 import org.eclipse.jface.text.contentassist.IContextInformationPresenter;
29 import org.eclipse.jface.text.contentassist.IContextInformationValidator;
30
31 import org.eclipse.jdt.internal.ui.text.JavaHeuristicScanner;
32
33
34
35 public class JavaParameterListValidator implements IContextInformationValidator, IContextInformationPresenter {
36
37 private int fPosition;
38 private ITextViewer fViewer;
39 private IContextInformation fInformation;
40
41 private int fCurrentParameter;
42
43
44
45 public JavaParameterListValidator() {
46 }
47
48
52 public void install(IContextInformation info, ITextViewer viewer, int documentPosition) {
53 fPosition= documentPosition;
54 fViewer= viewer;
55 fInformation= info;
56
57 fCurrentParameter= -1;
58 }
59
60 private int getCommentEnd(IDocument d, int pos, int end) throws BadLocationException {
61 while (pos < end) {
62 char curr= d.getChar(pos);
63 pos++;
64 if (curr == '*') {
65 if (pos < end && d.getChar(pos) == '/') {
66 return pos + 1;
67 }
68 }
69 }
70 return end;
71 }
72
73 private int getStringEnd(IDocument d, int pos, int end, char ch) throws BadLocationException {
74 while (pos < end) {
75 char curr= d.getChar(pos);
76 pos++;
77 if (curr == '\\') {
78 pos++;
80 } else if (curr == ch) {
81 return pos;
82 }
83 }
84 return end;
85 }
86
87 private int getCharCount(IDocument document, final int start, final int end, String increments, String decrements, boolean considerNesting) throws BadLocationException {
88
89 Assert.isTrue((increments.length() != 0 || decrements.length() != 0) && !increments.equals(decrements));
90
91 final int NONE= 0;
92 final int BRACKET= 1;
93 final int BRACE= 2;
94 final int PAREN= 3;
95 final int ANGLE= 4;
96
97 int nestingMode= NONE;
98 int nestingLevel= 0;
99
100 int charCount= 0;
101 int offset= start;
102 while (offset < end) {
103 char curr= document.getChar(offset++);
104 switch (curr) {
105 case '/':
106 if (offset < end) {
107 char next= document.getChar(offset);
108 if (next == '*') {
109 offset= getCommentEnd(document, offset + 1, end);
111 } else if (next == '/') {
112 offset= end;
114 }
115 }
116 break;
117 case '*':
118 if (offset < end) {
119 char next= document.getChar(offset);
120 if (next == '/') {
121 charCount= 0;
123 ++ offset;
124 }
125 }
126 break;
127 case '"':
128 case '\'':
129 offset= getStringEnd(document, offset, end, curr);
130 break;
131 case '[':
132 if (considerNesting) {
133 if (nestingMode == BRACKET || nestingMode == NONE) {
134 nestingMode= BRACKET;
135 nestingLevel++;
136 }
137 break;
138 }
139 case ']':
140 if (considerNesting) {
141 if (nestingMode == BRACKET)
142 if (--nestingLevel == 0)
143 nestingMode= NONE;
144 break;
145 }
146 case '(':
147 if (considerNesting) {
148 if (nestingMode == ANGLE) {
149 nestingMode=PAREN;
151 nestingLevel= 1;
152 }
153 if (nestingMode == PAREN || nestingMode == NONE) {
154 nestingMode= PAREN;
155 nestingLevel++;
156 }
157 break;
158 }
159 case ')':
160 if (considerNesting) {
161 if (nestingMode == PAREN)
162 if (--nestingLevel == 0)
163 nestingMode= NONE;
164 break;
165 }
166 case '{':
167 if (considerNesting) {
168 if (nestingMode == ANGLE) {
169 nestingMode=BRACE;
171 nestingLevel= 1;
172 }
173 if (nestingMode == BRACE || nestingMode == NONE) {
174 nestingMode= BRACE;
175 nestingLevel++;
176 }
177 break;
178 }
179 case '}':
180 if (considerNesting) {
181 if (nestingMode == BRACE)
182 if (--nestingLevel == 0)
183 nestingMode= NONE;
184 break;
185 }
186 case '<':
187 if (considerNesting) {
188 if (nestingMode == ANGLE || nestingMode == NONE && checkGenericsHeuristic(document, offset - 1, start - 1)) {
189 nestingMode= ANGLE;
190 nestingLevel++;
191 }
192 break;
193 }
194 case '>':
195 if (considerNesting) {
196 if (nestingMode == ANGLE)
197 if (--nestingLevel == 0)
198 nestingMode= NONE;
199 break;
200 }
201
202 default:
203 if (nestingLevel != 0)
204 continue;
205
206 if (increments.indexOf(curr) >= 0) {
207 ++ charCount;
208 }
209
210 if (decrements.indexOf(curr) >= 0) {
211 -- charCount;
212 }
213 }
214 }
215
216 return charCount;
217 }
218
219 private boolean checkGenericsHeuristic(IDocument document, int end, int bound) throws BadLocationException {
220 JavaHeuristicScanner scanner= new JavaHeuristicScanner(document);
221 return scanner.looksLikeClassInstanceCreationBackward(end, bound);
222 }
223
224
227 public boolean isContextInformationValid(int position) {
228
229 try {
230 if (position < fPosition)
231 return false;
232
233 IDocument document= fViewer.getDocument();
234 IRegion line= document.getLineInformationOfOffset(fPosition);
235
236 if (position < line.getOffset() || position >= document.getLength())
237 return false;
238
239 return getCharCount(document, fPosition, position, "(<", ")>", false) >= 0;
241 } catch (BadLocationException x) {
242 return false;
243 }
244 }
245
246
249 public boolean updatePresentation(int position, TextPresentation presentation) {
250
251 int currentParameter= -1;
252
253 try {
254 currentParameter= getCharCount(fViewer.getDocument(), fPosition, position, ",", "", true); } catch (BadLocationException x) {
256 return false;
257 }
258
259 if (fCurrentParameter != -1) {
260 if (currentParameter == fCurrentParameter)
261 return false;
262 }
263
264 presentation.clear();
265 fCurrentParameter= currentParameter;
266
267 String s= fInformation.getInformationDisplayString();
268 int[] commas= computeCommaPositions(s);
269
270 if (commas.length - 2 < fCurrentParameter) {
271 presentation.addStyleRange(new StyleRange(0, s.length(), null, null, SWT.NORMAL));
272 return true;
273 }
274
275 int start= commas[fCurrentParameter] + 1;
276 int end= commas[fCurrentParameter + 1];
277 if (start > 0)
278 presentation.addStyleRange(new StyleRange(0, start, null, null, SWT.NORMAL));
279
280 if (end > start)
281 presentation.addStyleRange(new StyleRange(start, end - start, null, null, SWT.BOLD));
282
283 if (end < s.length())
284 presentation.addStyleRange(new StyleRange(end, s.length() - end, null, null, SWT.NORMAL));
285
286 return true;
287 }
288
289 private int[] computeCommaPositions(String code) {
290 final int length= code.length();
291 int pos= 0;
292 List positions= new ArrayList ();
293 positions.add(new Integer (-1));
294 while (pos < length && pos != -1) {
295 char ch= code.charAt(pos);
296 switch (ch) {
297 case ',':
298 positions.add(new Integer (pos));
299 break;
300 case '<':
301 pos= code.indexOf('>', pos);
302 break;
303 case '[':
304 pos= code.indexOf(']', pos);
305 break;
306 default:
307 break;
308 }
309 if (pos != -1)
310 pos++;
311 }
312 positions.add(new Integer (length));
313
314 int[] fields= new int[positions.size()];
315 for (int i= 0; i < fields.length; i++)
316 fields[i]= ((Integer ) positions.get(i)).intValue();
317 return fields;
318 }
319
320 }
321
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