- some work to integrate the html parser the same way as the other parsers are integrated (not finished)
- added migration of code of settings pages (hmm.. does not work correctly yet, sorry) - more refactoring - removed more unused code git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@6187 6c8d7289-2bf4-0310-a012-ef5d649a1542pull/1/head
orbiter
16 years ago
parent
1ee109761f
commit
8ca1f5d400
@ -0,0 +1,195 @@
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package de.anomic.document.parser;
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import java.io.IOException;
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import java.io.InputStream;
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import java.nio.charset.Charset;
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import java.nio.charset.IllegalCharsetNameException;
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import java.nio.charset.UnsupportedCharsetException;
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import java.util.Hashtable;
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import de.anomic.document.AbstractParser;
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import de.anomic.document.Document;
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import de.anomic.document.Parser;
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import de.anomic.document.ParserException;
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import de.anomic.document.parser.html.ContentScraper;
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import de.anomic.document.parser.html.ScraperInputStream;
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import de.anomic.document.parser.html.TransformerWriter;
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import de.anomic.kelondro.util.FileUtils;
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import de.anomic.yacy.yacyURL;
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public class htmlParser extends AbstractParser implements Parser {
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/**
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* a list of mime types that are supported by this parser class
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* @see #getSupportedMimeTypes()
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*/
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public static final Hashtable<String, String> SUPPORTED_MIME_TYPES = new Hashtable<String, String>();
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static {
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SUPPORTED_MIME_TYPES.put("application/xhtml+xml","htm,html,xhtml,php,asp");
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SUPPORTED_MIME_TYPES.put("text/html","htm,html,xhtml,php,asp");
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SUPPORTED_MIME_TYPES.put("text/plain","htm,html,xhtml,php,asp,txt");
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SUPPORTED_MIME_TYPES.put("text/sgml","htm,html,xhtml,php,asp,xml");
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}
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public htmlParser() {
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super();
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this.parserName = "streaming html parser";
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}
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@Override
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public Document parse(
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final yacyURL location,
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final String mimeType,
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final String documentCharset,
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final InputStream sourceStream) throws ParserException, InterruptedException {
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// make a scraper and transformer
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final ScraperInputStream htmlFilter = new ScraperInputStream(sourceStream,documentCharset,location,null,false);
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String charset = null;
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try {
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charset = htmlFilter.detectCharset();
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} catch (IOException e1) {
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throw new ParserException("Charset error:" + e1.getMessage(), location);
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}
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if (charset == null) {
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charset = documentCharset;
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} else {
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charset = patchCharsetEncoding(charset);
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}
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if (!documentCharset.equalsIgnoreCase(charset)) {
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theLogger.logInfo("Charset transformation needed from '" + documentCharset + "' to '" + charset + "' for URL = " + location.toNormalform(true, true));
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}
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Charset c;
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try {
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c = Charset.forName(charset);
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} catch (IllegalCharsetNameException e) {
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c = Charset.defaultCharset();
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} catch (UnsupportedCharsetException e) {
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c = Charset.defaultCharset();
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}
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// parsing the content
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final ContentScraper scraper = new ContentScraper(location);
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final TransformerWriter writer = new TransformerWriter(null,null,scraper,null,false);
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try {
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FileUtils.copy(htmlFilter, writer, c);
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writer.close();
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} catch (IOException e) {
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throw new ParserException("IO error:" + e.getMessage(), location);
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}
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//OutputStream hfos = new htmlFilterOutputStream(null, scraper, null, false);
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//serverFileUtils.copy(sourceFile, hfos);
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//hfos.close();
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if (writer.binarySuspect()) {
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final String errorMsg = "Binary data found in resource";
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theLogger.logSevere("Unable to parse '" + location + "'. " + errorMsg);
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throw new ParserException(errorMsg,location);
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}
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return transformScraper(location, mimeType, documentCharset, scraper);
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}
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private static Document transformScraper(final yacyURL location, final String mimeType, final String charSet, final ContentScraper scraper) {
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final String[] sections = new String[scraper.getHeadlines(1).length + scraper.getHeadlines(2).length + scraper.getHeadlines(3).length + scraper.getHeadlines(4).length];
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int p = 0;
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for (int i = 1; i <= 4; i++) for (int j = 0; j < scraper.getHeadlines(i).length; j++) sections[p++] = scraper.getHeadlines(i)[j];
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final Document ppd = new Document(
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location,
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mimeType,
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charSet,
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scraper.getContentLanguages(),
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scraper.getKeywords(),
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scraper.getTitle(),
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scraper.getAuthor(),
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sections,
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scraper.getDescription(),
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scraper.getText(),
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scraper.getAnchors(),
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scraper.getImages());
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//scraper.close();
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ppd.setFavicon(scraper.getFavicon());
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return ppd;
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}
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/**
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* some html authors use wrong encoding names, either because they don't know exactly what they
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* are doing or they produce a type. Many times, the upper/downcase scheme of the name is fuzzy
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* This method patches wrong encoding names. The correct names are taken from
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* http://www.iana.org/assignments/character-sets
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* @param encoding
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* @return patched encoding name
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*/
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public static String patchCharsetEncoding(String encoding) {
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// return the system default encoding
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if ((encoding == null) || (encoding.length() < 3)) return Charset.defaultCharset().name();
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// trim encoding string
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encoding = encoding.trim();
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// fix upper/lowercase
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encoding = encoding.toUpperCase();
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if (encoding.startsWith("SHIFT")) return "Shift_JIS";
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if (encoding.startsWith("BIG")) return "Big5";
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// all other names but such with "windows" use uppercase
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if (encoding.startsWith("WINDOWS")) encoding = "windows" + encoding.substring(7);
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if (encoding.startsWith("MACINTOSH")) encoding = "MacRoman";
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// fix wrong fill characters
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encoding = encoding.replaceAll("_", "-");
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if (encoding.matches("GB[_-]?2312([-_]80)?")) return "GB2312";
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if (encoding.matches(".*UTF[-_]?8.*")) return "UTF-8";
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if (encoding.startsWith("US")) return "US-ASCII";
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if (encoding.startsWith("KOI")) return "KOI8-R";
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// patch missing '-'
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if (encoding.startsWith("windows") && encoding.length() > 7) {
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final char c = encoding.charAt(7);
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if ((c >= '0') && (c <= '9')) {
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encoding = "windows-" + encoding.substring(7);
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}
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}
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if (encoding.startsWith("ISO")) {
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// patch typos
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if (encoding.length() > 3) {
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final char c = encoding.charAt(3);
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if ((c >= '0') && (c <= '9')) {
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encoding = "ISO-" + encoding.substring(3);
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}
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}
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if (encoding.length() > 8) {
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final char c = encoding.charAt(8);
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if ((c >= '0') && (c <= '9')) {
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encoding = encoding.substring(0, 8) + "-" + encoding.substring(8);
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}
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}
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}
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// patch wrong name
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if (encoding.startsWith("ISO-8559")) {
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// popular typo
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encoding = "ISO-8859" + encoding.substring(8);
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}
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// converting cp\d{4} -> windows-\d{4}
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if (encoding.matches("CP([_-])?125[0-8]")) {
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final char c = encoding.charAt(2);
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if ((c >= '0') && (c <= '9')) {
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encoding = "windows-" + encoding.substring(2);
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} else {
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encoding = "windows" + encoding.substring(2);
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}
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}
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return encoding;
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}
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public Hashtable<String, String> getSupportedMimeTypes() {
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return SUPPORTED_MIME_TYPES;
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}
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}
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