diff options
Diffstat (limited to 'build/org.eclipse.cdt.autotools.ui/src/org/eclipse/cdt/internal/autotools/ui/HTML2TextReader.java')
| -rw-r--r-- | build/org.eclipse.cdt.autotools.ui/src/org/eclipse/cdt/internal/autotools/ui/HTML2TextReader.java | 260 |
1 files changed, 260 insertions, 0 deletions
diff --git a/build/org.eclipse.cdt.autotools.ui/src/org/eclipse/cdt/internal/autotools/ui/HTML2TextReader.java b/build/org.eclipse.cdt.autotools.ui/src/org/eclipse/cdt/internal/autotools/ui/HTML2TextReader.java new file mode 100644 index 00000000000..b1a507309c9 --- /dev/null +++ b/build/org.eclipse.cdt.autotools.ui/src/org/eclipse/cdt/internal/autotools/ui/HTML2TextReader.java @@ -0,0 +1,260 @@ +/******************************************************************************* + * Copyright (c) 2000 2005 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 + * QNX Software System + *******************************************************************************/ +package org.eclipse.cdt.internal.autotools.ui; + + +import java.io.IOException; +import java.io.PushbackReader; +import java.io.Reader; +import java.util.HashMap; +import java.util.HashSet; +import java.util.Map; +import java.util.Set; + +import org.eclipse.jface.text.TextPresentation; +import org.eclipse.swt.SWT; +import org.eclipse.swt.custom.StyleRange; + + +/** + * Reads the text contents from a reader of HTML contents and translates + * the tags or cut them out. + */ +public class HTML2TextReader extends SubstitutionTextReader { + + + private static final String LINE_DELIM= System.getProperty("line.separator", "\n"); //$NON-NLS-1$ //$NON-NLS-2$ + private static final Map<String, String> fgEntityLookup; + private static final Set<String> fgTags; + + static { + + fgTags= new HashSet<String>(); + fgTags.add("b"); //$NON-NLS-1$ + fgTags.add("br"); //$NON-NLS-1$ + fgTags.add("h5"); //$NON-NLS-1$ + fgTags.add("p"); //$NON-NLS-1$ + fgTags.add("dl"); //$NON-NLS-1$ + fgTags.add("dt"); //$NON-NLS-1$ + fgTags.add("dd"); //$NON-NLS-1$ + fgTags.add("li"); //$NON-NLS-1$ + fgTags.add("ul"); //$NON-NLS-1$ + + fgEntityLookup= new HashMap<String, String>(7); + fgEntityLookup.put("lt", "<"); //$NON-NLS-1$ //$NON-NLS-2$ + fgEntityLookup.put("gt", ">"); //$NON-NLS-1$ //$NON-NLS-2$ + fgEntityLookup.put("nbsp", " "); //$NON-NLS-1$ //$NON-NLS-2$ + fgEntityLookup.put("amp", "&"); //$NON-NLS-1$ //$NON-NLS-2$ + fgEntityLookup.put("circ", "^"); //$NON-NLS-1$ //$NON-NLS-2$ + fgEntityLookup.put("tilde", "~"); //$NON-NLS-2$ //$NON-NLS-1$ + fgEntityLookup.put("quot", "\""); //$NON-NLS-1$ //$NON-NLS-2$ + } + + private int fCounter= 0; + private TextPresentation fTextPresentation; + private int fBold= 0; + private int fStartOffset= -1; + private boolean fInParagraph= false; + + /** + * Transforms the html text from the reader to formatted text. + * @param presentation If not <code>null</code>, formattings will be applied to + * the presentation. + */ + public HTML2TextReader(Reader reader, TextPresentation presentation) { + super(new PushbackReader(reader)); + fTextPresentation= presentation; + } + + public int read() throws IOException { + int c= super.read(); + if (c != -1) + ++ fCounter; + return c; + } + + protected void startBold() { + if (fBold == 0) + fStartOffset= fCounter; + ++ fBold; + } + + protected void stopBold() { + -- fBold; + if (fBold == 0) { + if (fTextPresentation != null) { + fTextPresentation.addStyleRange(new StyleRange(fStartOffset, fCounter - fStartOffset, null, null, SWT.BOLD)); + } + fStartOffset= -1; + } + } + + /** + * @see SubstitutionTextReader#computeSubstitution(char) + */ + protected String computeSubstitution(int c) throws IOException { + if (c == '<') + return processHTMLTag(); + else if (c == '&') + return processEntity(); + + return null; + } + + private String html2Text(String html) { + + String tag= html; + if ('/' == tag.charAt(0)) + tag= tag.substring(1); + + if (!fgTags.contains(tag)) + return ""; //$NON-NLS-1$ + + if ("b".equals(html)) { //$NON-NLS-1$ + startBold(); + return ""; //$NON-NLS-1$ + } + + if ("h5".equals(html) || "dt".equals(html)) { //$NON-NLS-1$ //$NON-NLS-2$ + startBold(); + return ""; //$NON-NLS-1$ + } + + if ("dl".equals(html)) //$NON-NLS-1$ + return LINE_DELIM; + + if ("dd".equals(html)) //$NON-NLS-1$ + return "\t"; //$NON-NLS-1$ + + if ("li".equals(html)) //$NON-NLS-1$ + return LINE_DELIM + "\t" + "-"; //$NON-NLS-1$ //$NON-NLS-2$ + + if ("/b".equals(html)) { //$NON-NLS-1$ + stopBold(); + return ""; //$NON-NLS-1$ + } + + if ("p".equals(html)) { //$NON-NLS-1$ + fInParagraph= true; + return LINE_DELIM; + } + + if ("br".equals(html)) //$NON-NLS-1$ + return LINE_DELIM; + + if ("/p".equals(html)) { //$NON-NLS-1$ + boolean inParagraph= fInParagraph; + fInParagraph= false; + return inParagraph ? "" : LINE_DELIM; //$NON-NLS-1$ + } + + if ("/h5".equals(html) || "/dt".equals(html)) { //$NON-NLS-1$ //$NON-NLS-2$ + stopBold(); + return LINE_DELIM; + } + + if ("/dd".equals(html)) //$NON-NLS-1$ + return LINE_DELIM; + + return ""; //$NON-NLS-1$ + } + + /* + * A '<' has been read. Process a html tag + */ + private String processHTMLTag() throws IOException { + + StringBuffer buf= new StringBuffer(); + int ch; + do { + + ch= nextChar(); + + while (ch != -1 && ch != '>') { + buf.append(Character.toLowerCase((char) ch)); + ch= nextChar(); + if (ch == '"'){ + buf.append(Character.toLowerCase((char) ch)); + ch= nextChar(); + while (ch != -1 && ch != '"'){ + buf.append(Character.toLowerCase((char) ch)); + ch= nextChar(); + } + } + if (ch == '<'){ + unread(ch); + return '<' + buf.toString(); + } + } + + if (ch == -1) + return null; + + int tagLen= buf.length(); + // needs special treatment for comments + if ((tagLen >= 3 && "!--".equals(buf.substring(0, 3))) //$NON-NLS-1$ + && !(tagLen >= 5 && "--!".equals(buf.substring(tagLen - 3)))) { //$NON-NLS-1$ + // unfinished comment + buf.append(ch); + } else { + break; + } + } while (true); + + return html2Text(buf.toString()); + } + + private void unread(int ch) throws IOException { + ((PushbackReader) getReader()).unread(ch); + } + + protected String entity2Text(String symbol) { + if (symbol.length() > 1 && symbol.charAt(0) == '#') { + int ch; + try { + if (symbol.charAt(1) == 'x') { + ch= Integer.parseInt(symbol.substring(2), 16); + } else { + ch= Integer.parseInt(symbol.substring(1), 10); + } + return "" + (char)ch; //$NON-NLS-1$ + } catch (NumberFormatException e) { + } + } else { + String str= (String) fgEntityLookup.get(symbol); + if (str != null) { + return str; + } + } + return "&" + symbol; // not found //$NON-NLS-1$ + } + + /* + * A '&' has been read. Process a entity + */ + private String processEntity() throws IOException { + StringBuffer buf= new StringBuffer(); + int ch= nextChar(); + while (Character.isLetterOrDigit((char)ch) || ch == '#') { + buf.append((char) ch); + ch= nextChar(); + } + + if (ch == ';') + return entity2Text(buf.toString()); + + buf.insert(0, '&'); + if (ch != -1) + buf.append((char) ch); + return buf.toString(); + } +}
\ No newline at end of file |