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1
11 package org.eclipse.jface.internal.text.html;
12
13 import java.io.IOException  ;
14 import java.io.PushbackReader ;
15 import java.io.Reader ;
16 import java.util.HashMap ;
17 import java.util.HashSet ;
18 import java.util.Map ;
19 import java.util.Set ;
20
21 import org.eclipse.swt.SWT;
22 import org.eclipse.swt.custom.StyleRange;
23
24 import org.eclipse.jface.text.TextPresentation;
25
26
27
33 public class HTML2TextReader extends SubstitutionTextReader {
34
35 private static final String EMPTY_STRING= ""; private static final Map fgEntityLookup;
37 private static final Set fgTags;
38
39 static {
40
41 fgTags= new HashSet ();
42 fgTags.add("b"); fgTags.add("br"); fgTags.add("br/"); fgTags.add("div"); fgTags.add("h1"); fgTags.add("h2"); fgTags.add("h3"); fgTags.add("h4"); fgTags.add("h5"); fgTags.add("p"); fgTags.add("dl"); fgTags.add("dt"); fgTags.add("dd"); fgTags.add("li"); fgTags.add("ul"); fgTags.add("pre"); fgTags.add("head");
60 fgEntityLookup= new HashMap (7);
61 fgEntityLookup.put("lt", "<"); fgEntityLookup.put("gt", ">"); fgEntityLookup.put("nbsp", " "); fgEntityLookup.put("amp", "&"); fgEntityLookup.put("circ", "^"); fgEntityLookup.put("tilde", "~"); fgEntityLookup.put("quot", "\""); }
69
70 private int fCounter= 0;
71 private TextPresentation fTextPresentation;
72 private int fBold= 0;
73 private int fStartOffset= -1;
74 private boolean fInParagraph= false;
75 private boolean fIsPreformattedText= false;
76 private boolean fIgnore= false;
77 private boolean fHeaderDetected= false;
78
79
86 public HTML2TextReader(Reader reader, TextPresentation presentation) {
87 super(new PushbackReader (reader));
88 fTextPresentation= presentation;
89 }
90
91 public int read() throws IOException {
92 int c= super.read();
93 if (c != -1)
94 ++ fCounter;
95 return c;
96 }
97
98 protected void startBold() {
99 if (fBold == 0)
100 fStartOffset= fCounter;
101 ++ fBold;
102 }
103
104 protected void startPreformattedText() {
105 fIsPreformattedText= true;
106 setSkipWhitespace(false);
107 }
108
109 protected void stopPreformattedText() {
110 fIsPreformattedText= false;
111 setSkipWhitespace(true);
112 }
113
114 protected void stopBold() {
115 -- fBold;
116 if (fBold == 0) {
117 if (fTextPresentation != null) {
118 fTextPresentation.addStyleRange(new StyleRange(fStartOffset, fCounter - fStartOffset, null, null, SWT.BOLD));
119 }
120 fStartOffset= -1;
121 }
122 }
123
124
127 protected String computeSubstitution(int c) throws IOException {
128
129 if (c == '<')
130 return processHTMLTag();
131 else if (fIgnore)
132 return EMPTY_STRING;
133 else if (c == '&')
134 return processEntity();
135 else if (fIsPreformattedText)
136 return processPreformattedText(c);
137
138 return null;
139 }
140
141 private String html2Text(String html) {
142
143 if (html == null || html.length() == 0)
144 return EMPTY_STRING;
145
146 html= html.toLowerCase();
147
148 String tag= html;
149 if ('/' == tag.charAt(0))
150 tag= tag.substring(1);
151
152 if (!fgTags.contains(tag))
153 return EMPTY_STRING;
154
155
156 if ("pre".equals(html)) { startPreformattedText();
158 return EMPTY_STRING;
159 }
160
161 if ("/pre".equals(html)) { stopPreformattedText();
163 return EMPTY_STRING;
164 }
165
166 if (fIsPreformattedText)
167 return EMPTY_STRING;
168
169 if ("b".equals(html)) { startBold();
171 return EMPTY_STRING;
172 }
173
174 if ((html.length() > 1 && html.charAt(0) == 'h' && Character.isDigit(html.charAt(1))) || "dt".equals(html)) { startBold();
176 return EMPTY_STRING;
177 }
178
179 if ("dl".equals(html)) return LINE_DELIM;
181
182 if ("dd".equals(html)) return "\t";
185 if ("li".equals(html)) return LINE_DELIM + HTMLMessages.getString("HTML2TextReader.listItemPrefix");
189 if ("/b".equals(html)) { stopBold();
191 return EMPTY_STRING;
192 }
193
194 if ("p".equals(html)) { fInParagraph= true;
196 return LINE_DELIM;
197 }
198
199 if ("br".equals(html) || "br/".equals(html) || "div".equals(html)) return LINE_DELIM;
201
202 if ("/p".equals(html)) { boolean inParagraph= fInParagraph;
204 fInParagraph= false;
205 return inParagraph ? EMPTY_STRING : LINE_DELIM;
206 }
207
208 if ((html.startsWith("/h") && html.length() > 2 && Character.isDigit(html.charAt(2))) || "/dt".equals(html)) { stopBold();
210 return LINE_DELIM;
211 }
212
213 if ("/dd".equals(html)) return LINE_DELIM;
215
216 if ("head".equals(html) && !fHeaderDetected) { fHeaderDetected= true;
218 fIgnore= true;
219 return EMPTY_STRING;
220 }
221
222 if ("/head".equals(html) && fHeaderDetected && fIgnore) { fIgnore= false;
224 return EMPTY_STRING;
225 }
226
227 return EMPTY_STRING;
228 }
229
230
233 private String processHTMLTag() throws IOException {
234
235 StringBuffer buf= new StringBuffer ();
236 int ch;
237 do {
238
239 ch= nextChar();
240
241 while (ch != -1 && ch != '>') {
242 buf.append(Character.toLowerCase((char) ch));
243 ch= nextChar();
244 if (ch == '"'){
245 buf.append(Character.toLowerCase((char) ch));
246 ch= nextChar();
247 while (ch != -1 && ch != '"'){
248 buf.append(Character.toLowerCase((char) ch));
249 ch= nextChar();
250 }
251 }
252 if (ch == '<'){
253 unread(ch);
254 return '<' + buf.toString();
255 }
256 }
257
258 if (ch == -1)
259 return null;
260
261 int tagLen= buf.length();
262 if ((tagLen >= 3 && "!--".equals(buf.substring(0, 3))) && !(tagLen >= 5 && "--".equals(buf.substring(tagLen - 2)))) { buf.append(ch);
267 } else {
268 break;
269 }
270 } while (true);
271
272 return html2Text(buf.toString());
273 }
274
275 private String processPreformattedText(int c) {
276 if (c == '\r' || c == '\n')
277 fCounter++;
278 return null;
279 }
280
281
282 private void unread(int ch) throws IOException {
283 ((PushbackReader ) getReader()).unread(ch);
284 }
285
286 protected String entity2Text(String symbol) {
287 if (symbol.length() > 1 && symbol.charAt(0) == '#') {
288 int ch;
289 try {
290 if (symbol.charAt(1) == 'x') {
291 ch= Integer.parseInt(symbol.substring(2), 16);
292 } else {
293 ch= Integer.parseInt(symbol.substring(1), 10);
294 }
295 return EMPTY_STRING + (char)ch;
296 } catch (NumberFormatException e) {
297 }
298 } else {
299 String str= (String ) fgEntityLookup.get(symbol);
300 if (str != null) {
301 return str;
302 }
303 }
304 return "&" + symbol; }
306
307
310 private String processEntity() throws IOException {
311 StringBuffer buf= new StringBuffer ();
312 int ch= nextChar();
313 while (Character.isLetterOrDigit((char)ch) || ch == '#') {
314 buf.append((char) ch);
315 ch= nextChar();
316 }
317
318 if (ch == ';')
319 return entity2Text(buf.toString());
320
321 buf.insert(0, '&');
322 if (ch != -1)
323 buf.append((char) ch);
324 return buf.toString();
325 }
326 }
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