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HTMLParser.javaAPI DocApache Lucene 1.920354Mon Feb 20 09:20:24 GMT 2006org.apache.lucene.demo.html

HTMLParser

public class HTMLParser extends Object implements HTMLParserConstants

Fields Summary
public static int
SUMMARY_LENGTH
StringBuffer
title
StringBuffer
summary
Properties
metaTags
String
currentMetaTag
String
currentMetaContent
int
length
boolean
titleComplete
boolean
inTitle
boolean
inMetaTag
boolean
inStyle
boolean
afterTag
boolean
afterSpace
String
eol
Reader
pipeIn
Writer
pipeOut
private MyPipedInputStream
pipeInStream
private PipedOutputStream
pipeOutStream
public HTMLParserTokenManager
token_source
SimpleCharStream
jj_input_stream
public Token
token
public Token
jj_nt
private int
jj_ntk
private Token
jj_scanpos
private Token
jj_lastpos
private int
jj_la
public boolean
lookingAhead
private boolean
jj_semLA
private int
jj_gen
private final int[]
jj_la1
private static int[]
jj_la1_0
private final JJCalls[]
jj_2_rtns
private boolean
jj_rescan
private int
jj_gc
private final LookaheadSuccess
jj_ls
private Vector
jj_expentries
private int[]
jj_expentry
private int
jj_kind
private int[]
jj_lasttokens
private int
jj_endpos
Constructors Summary
public HTMLParser(File file)

deprecated
Use HTMLParser(FileInputStream) instead

    this(new FileInputStream(file));
  
public HTMLParser(InputStream stream)


     
    jj_input_stream = new SimpleCharStream(stream, 1, 1);
    token_source = new HTMLParserTokenManager(jj_input_stream);
    token = new Token();
    jj_ntk = -1;
    jj_gen = 0;
    for (int i = 0; i < 14; i++) jj_la1[i] = -1;
    for (int i = 0; i < jj_2_rtns.length; i++) jj_2_rtns[i] = new JJCalls();
  
public HTMLParser(Reader stream)

    jj_input_stream = new SimpleCharStream(stream, 1, 1);
    token_source = new HTMLParserTokenManager(jj_input_stream);
    token = new Token();
    jj_ntk = -1;
    jj_gen = 0;
    for (int i = 0; i < 14; i++) jj_la1[i] = -1;
    for (int i = 0; i < jj_2_rtns.length; i++) jj_2_rtns[i] = new JJCalls();
  
public HTMLParser(HTMLParserTokenManager tm)

    token_source = tm;
    token = new Token();
    jj_ntk = -1;
    jj_gen = 0;
    for (int i = 0; i < 14; i++) jj_la1[i] = -1;
    for (int i = 0; i < jj_2_rtns.length; i++) jj_2_rtns[i] = new JJCalls();
  
Methods Summary
public final TokenArgValue()

  Token t = null;
    switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
    case ArgValue:
      t = jj_consume_token(ArgValue);
                                              {if (true) return t;}
      break;
    default:
      jj_la1[5] = jj_gen;
      if (jj_2_1(2)) {
        jj_consume_token(ArgQuote1);
        jj_consume_token(CloseQuote1);
                                              {if (true) return t;}
      } else {
        switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
        case ArgQuote1:
          jj_consume_token(ArgQuote1);
          t = jj_consume_token(Quote1Text);
          jj_consume_token(CloseQuote1);
                                              {if (true) return t;}
          break;
        default:
          jj_la1[6] = jj_gen;
          if (jj_2_2(2)) {
            jj_consume_token(ArgQuote2);
            jj_consume_token(CloseQuote2);
                                              {if (true) return t;}
          } else {
            switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
            case ArgQuote2:
              jj_consume_token(ArgQuote2);
              t = jj_consume_token(Quote2Text);
              jj_consume_token(CloseQuote2);
                                              {if (true) return t;}
              break;
            default:
              jj_la1[7] = jj_gen;
              jj_consume_token(-1);
              throw new ParseException();
            }
          }
        }
      }
    }
    throw new Error("Missing return statement in function");
  
public final voidCommentTag()

    switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
    case Comment1:
      jj_consume_token(Comment1);
      label_4:
      while (true) {
        switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
        case CommentText1:
          ;
          break;
        default:
          jj_la1[10] = jj_gen;
          break label_4;
        }
        jj_consume_token(CommentText1);
      }
      jj_consume_token(CommentEnd1);
      break;
    case Comment2:
      jj_consume_token(Comment2);
      label_5:
      while (true) {
        switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
        case CommentText2:
          ;
          break;
        default:
          jj_la1[11] = jj_gen;
          break label_5;
        }
        jj_consume_token(CommentText2);
      }
      jj_consume_token(CommentEnd2);
      break;
    default:
      jj_la1[12] = jj_gen;
      jj_consume_token(-1);
      throw new ParseException();
    }
  
public final TokenDecl()

  Token t;
    t = jj_consume_token(DeclName);
    label_3:
    while (true) {
      switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
      case ArgName:
      case ArgEquals:
      case ArgValue:
      case ArgQuote1:
      case ArgQuote2:
        ;
        break;
      default:
        jj_la1[8] = jj_gen;
        break label_3;
      }
      switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
      case ArgName:
        jj_consume_token(ArgName);
        break;
      case ArgValue:
      case ArgQuote1:
      case ArgQuote2:
        ArgValue();
        break;
      case ArgEquals:
        jj_consume_token(ArgEquals);
        break;
      default:
        jj_la1[9] = jj_gen;
        jj_consume_token(-1);
        throw new ParseException();
      }
    }
    jj_consume_token(TagEnd);
    {if (true) return t;}
    throw new Error("Missing return statement in function");
  
public final voidHTMLDocument()

  Token t;
    label_1:
    while (true) {
      switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
      case ScriptStart:
      case TagName:
      case DeclName:
      case Comment1:
      case Comment2:
      case Word:
      case Entity:
      case Space:
      case Punct:
        ;
        break;
      default:
        jj_la1[0] = jj_gen;
        break label_1;
      }
      switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
      case TagName:
        Tag();
                      afterTag = true;
        break;
      case DeclName:
        t = Decl();
                      afterTag = true;
        break;
      case Comment1:
      case Comment2:
        CommentTag();
                      afterTag = true;
        break;
      case ScriptStart:
        ScriptTag();
                     afterTag = true;
        break;
      case Word:
        t = jj_consume_token(Word);
                      addText(t.image); afterTag = false;
        break;
      case Entity:
        t = jj_consume_token(Entity);
                      addText(Entities.decode(t.image)); afterTag = false;
        break;
      case Punct:
        t = jj_consume_token(Punct);
                      addText(t.image); afterTag = false;
        break;
      case Space:
        jj_consume_token(Space);
                      addSpace(); afterTag = false;
        break;
      default:
        jj_la1[1] = jj_gen;
        jj_consume_token(-1);
        throw new ParseException();
      }
    }
    jj_consume_token(0);
  
public voidReInit(java.io.InputStream stream)

    jj_input_stream.ReInit(stream, 1, 1);
    token_source.ReInit(jj_input_stream);
    token = new Token();
    jj_ntk = -1;
    jj_gen = 0;
    for (int i = 0; i < 14; i++) jj_la1[i] = -1;
    for (int i = 0; i < jj_2_rtns.length; i++) jj_2_rtns[i] = new JJCalls();
  
public voidReInit(java.io.Reader stream)

    jj_input_stream.ReInit(stream, 1, 1);
    token_source.ReInit(jj_input_stream);
    token = new Token();
    jj_ntk = -1;
    jj_gen = 0;
    for (int i = 0; i < 14; i++) jj_la1[i] = -1;
    for (int i = 0; i < jj_2_rtns.length; i++) jj_2_rtns[i] = new JJCalls();
  
public voidReInit(HTMLParserTokenManager tm)

    token_source = tm;
    token = new Token();
    jj_ntk = -1;
    jj_gen = 0;
    for (int i = 0; i < 14; i++) jj_la1[i] = -1;
    for (int i = 0; i < jj_2_rtns.length; i++) jj_2_rtns[i] = new JJCalls();
  
public final voidScriptTag()

    jj_consume_token(ScriptStart);
    label_6:
    while (true) {
      switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
      case ScriptText:
        ;
        break;
      default:
        jj_la1[13] = jj_gen;
        break label_6;
      }
      jj_consume_token(ScriptText);
    }
    jj_consume_token(ScriptEnd);
  
public final voidTag()

  Token t1, t2;
  boolean inImg = false;
    t1 = jj_consume_token(TagName);
   String tagName = t1.image.toLowerCase();
   if(Tags.WS_ELEMS.contains(tagName) ) {
      addSpace();
    }
    inTitle = tagName.equalsIgnoreCase("<title"); // keep track if in <TITLE>
    inMetaTag = tagName.equalsIgnoreCase("<META"); // keep track if in <META>
    inStyle = tagName.equalsIgnoreCase("<STYLE"); // keep track if in <STYLE>
    inImg = tagName.equalsIgnoreCase("<img");     // keep track if in <IMG>

    label_2:
    while (true) {
      switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
      case ArgName:
        ;
        break;
      default:
        jj_la1[2] = jj_gen;
        break label_2;
      }
      t1 = jj_consume_token(ArgName);
      switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
      case ArgEquals:
        jj_consume_token(ArgEquals);
        switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
        case ArgValue:
        case ArgQuote1:
        case ArgQuote2:
          t2 = ArgValue();
       if (inImg && t1.image.equalsIgnoreCase("alt") && t2 != null)
         addText("[" + t2.image + "]");

        if(inMetaTag &&
                        (  t1.image.equalsIgnoreCase("name") ||
                           t1.image.equalsIgnoreCase("HTTP-EQUIV")
                        )
           && t2 != null)
        {
                currentMetaTag=t2.image.toLowerCase();
                if(currentMetaTag != null && currentMetaContent != null) {
                addMetaTag();
                }
        }
        if(inMetaTag && t1.image.equalsIgnoreCase("content") && t2 !=
null)
        {
                currentMetaContent=t2.image.toLowerCase();
                if(currentMetaTag != null && currentMetaContent != null) {
                addMetaTag();
                }
        }
          break;
        default:
          jj_la1[3] = jj_gen;
          ;
        }
        break;
      default:
        jj_la1[4] = jj_gen;
        ;
      }
    }
    jj_consume_token(TagEnd);
  
voidaddMetaTag()

      metaTags.setProperty(currentMetaTag, currentMetaContent);
      currentMetaTag = null;
      currentMetaContent = null;
      return;
  
voidaddSpace()

    if (!afterSpace) {
      if (inTitle)
        title.append(" ");
      else
        addToSummary(" ");

      String space = afterTag ? eol : " ";
      length += space.length();
      pipeOut.write(space);
      afterSpace = true;
    }
  
voidaddText(java.lang.String text)

    if (inStyle)
      return;
    if (inTitle)
      title.append(text);
    else {
      addToSummary(text);
      if (!titleComplete && !title.equals("")) {  // finished title
        synchronized(this) {
          titleComplete = true;                   // tell waiting threads
          notifyAll();
        }
      }
    }

    length += text.length();
    pipeOut.write(text);

    afterSpace = false;
  
voidaddToSummary(java.lang.String text)

    if (summary.length() < SUMMARY_LENGTH) {
      summary.append(text);
      if (summary.length() >= SUMMARY_LENGTH) {
        synchronized(this) {
          notifyAll();
        }
      }
    }
  
public final voiddisable_tracing()

  
public final voidenable_tracing()

  
public ParseExceptiongenerateParseException()

    jj_expentries.removeAllElements();
    boolean[] la1tokens = new boolean[31];
    for (int i = 0; i < 31; i++) {
      la1tokens[i] = false;
    }
    if (jj_kind >= 0) {
      la1tokens[jj_kind] = true;
      jj_kind = -1;
    }
    for (int i = 0; i < 14; i++) {
      if (jj_la1[i] == jj_gen) {
        for (int j = 0; j < 32; j++) {
          if ((jj_la1_0[i] & (1<<j)) != 0) {
            la1tokens[j] = true;
          }
        }
      }
    }
    for (int i = 0; i < 31; i++) {
      if (la1tokens[i]) {
        jj_expentry = new int[1];
        jj_expentry[0] = i;
        jj_expentries.addElement(jj_expentry);
      }
    }
    jj_endpos = 0;
    jj_rescan_token();
    jj_add_error_token(0, 0);
    int[][] exptokseq = new int[jj_expentries.size()][];
    for (int i = 0; i < jj_expentries.size(); i++) {
      exptokseq[i] = (int[])jj_expentries.elementAt(i);
    }
    return new ParseException(token, exptokseq, tokenImage);
  
public java.util.PropertiesgetMetaTags()

    if (pipeIn == null)
      getReader();                                // spawn parsing thread
    while (true) {
      synchronized(this) {
        if (titleComplete || pipeInStream.full())
          break;
        wait(10);
      }
    }
    return metaTags;
  
public final TokengetNextToken()

    if (token.next != null) token = token.next;
    else token = token.next = token_source.getNextToken();
    jj_ntk = -1;
    jj_gen++;
    return token;
  
public java.io.ReadergetReader()

    if (pipeIn == null) {
      pipeInStream = new MyPipedInputStream();
      pipeOutStream = new PipedOutputStream(pipeInStream);
      pipeIn = new InputStreamReader(pipeInStream, "UTF-16BE");
      pipeOut = new OutputStreamWriter(pipeOutStream, "UTF-16BE");

      Thread thread = new ParserThread(this);
      thread.start();                             // start parsing
    }

    return pipeIn;
  
public java.lang.StringgetSummary()

    if (pipeIn == null)
      getReader();                                // spawn parsing thread
    while (true) {
      synchronized(this) {
        if (summary.length() >= SUMMARY_LENGTH || pipeInStream.full())
          break;
        wait(10);
      }
    }
    if (summary.length() > SUMMARY_LENGTH)
      summary.setLength(SUMMARY_LENGTH);

    String sum = summary.toString().trim();
    String tit = getTitle();
    if (sum.startsWith(tit) || sum.equals(""))
      return tit;
    else
      return sum;
  
public java.lang.StringgetTitle()

    if (pipeIn == null)
      getReader();                                // spawn parsing thread
    while (true) {
      synchronized(this) {
        if (titleComplete || pipeInStream.full())
          break;
        wait(10);
      }
    }
    return title.toString().trim();
  
public final TokengetToken(int index)

    Token t = lookingAhead ? jj_scanpos : token;
    for (int i = 0; i < index; i++) {
      if (t.next != null) t = t.next;
      else t = t.next = token_source.getNextToken();
    }
    return t;
  
private final booleanjj_2_1(int xla)

    jj_la = xla; jj_lastpos = jj_scanpos = token;
    try { return !jj_3_1(); }
    catch(LookaheadSuccess ls) { return true; }
    finally { jj_save(0, xla); }
  
private final booleanjj_2_2(int xla)

    jj_la = xla; jj_lastpos = jj_scanpos = token;
    try { return !jj_3_2(); }
    catch(LookaheadSuccess ls) { return true; }
    finally { jj_save(1, xla); }
  
private final booleanjj_3_1()

    if (jj_scan_token(ArgQuote1)) return true;
    if (jj_scan_token(CloseQuote1)) return true;
    return false;
  
private final booleanjj_3_2()

    if (jj_scan_token(ArgQuote2)) return true;
    if (jj_scan_token(CloseQuote2)) return true;
    return false;
  
private voidjj_add_error_token(int kind, int pos)


        
    if (pos >= 100) return;
    if (pos == jj_endpos + 1) {
      jj_lasttokens[jj_endpos++] = kind;
    } else if (jj_endpos != 0) {
      jj_expentry = new int[jj_endpos];
      for (int i = 0; i < jj_endpos; i++) {
        jj_expentry[i] = jj_lasttokens[i];
      }
      boolean exists = false;
      for (java.util.Enumeration e = jj_expentries.elements(); e.hasMoreElements();) {
        int[] oldentry = (int[])(e.nextElement());
        if (oldentry.length == jj_expentry.length) {
          exists = true;
          for (int i = 0; i < jj_expentry.length; i++) {
            if (oldentry[i] != jj_expentry[i]) {
              exists = false;
              break;
            }
          }
          if (exists) break;
        }
      }
      if (!exists) jj_expentries.addElement(jj_expentry);
      if (pos != 0) jj_lasttokens[(jj_endpos = pos) - 1] = kind;
    }
  
private final Tokenjj_consume_token(int kind)

    Token oldToken;
    if ((oldToken = token).next != null) token = token.next;
    else token = token.next = token_source.getNextToken();
    jj_ntk = -1;
    if (token.kind == kind) {
      jj_gen++;
      if (++jj_gc > 100) {
        jj_gc = 0;
        for (int i = 0; i < jj_2_rtns.length; i++) {
          JJCalls c = jj_2_rtns[i];
          while (c != null) {
            if (c.gen < jj_gen) c.first = null;
            c = c.next;
          }
        }
      }
      return token;
    }
    token = oldToken;
    jj_kind = kind;
    throw generateParseException();
  
private static voidjj_la1_0()

   
      jj_la1_0();
   
      jj_la1_0 = new int[] {0x2c7e,0x2c7e,0x10000,0x380000,0x20000,0x80000,0x100000,0x200000,0x3b0000,0x3b0000,0x8000000,0x20000000,0x30,0x4000,};
   
private final intjj_ntk()

    if ((jj_nt=token.next) == null)
      return (jj_ntk = (token.next=token_source.getNextToken()).kind);
    else
      return (jj_ntk = jj_nt.kind);
  
private final voidjj_rescan_token()

    jj_rescan = true;
    for (int i = 0; i < 2; i++) {
      JJCalls p = jj_2_rtns[i];
      do {
        if (p.gen > jj_gen) {
          jj_la = p.arg; jj_lastpos = jj_scanpos = p.first;
          switch (i) {
            case 0: jj_3_1(); break;
            case 1: jj_3_2(); break;
          }
        }
        p = p.next;
      } while (p != null);
    }
    jj_rescan = false;
  
private final voidjj_save(int index, int xla)

    JJCalls p = jj_2_rtns[index];
    while (p.gen > jj_gen) {
      if (p.next == null) { p = p.next = new JJCalls(); break; }
      p = p.next;
    }
    p.gen = jj_gen + xla - jj_la; p.first = token; p.arg = xla;
  
private final booleanjj_scan_token(int kind)

       
    if (jj_scanpos == jj_lastpos) {
      jj_la--;
      if (jj_scanpos.next == null) {
        jj_lastpos = jj_scanpos = jj_scanpos.next = token_source.getNextToken();
      } else {
        jj_lastpos = jj_scanpos = jj_scanpos.next;
      }
    } else {
      jj_scanpos = jj_scanpos.next;
    }
    if (jj_rescan) {
      int i = 0; Token tok = token;
      while (tok != null && tok != jj_scanpos) { i++; tok = tok.next; }
      if (tok != null) jj_add_error_token(kind, i);
    }
    if (jj_scanpos.kind != kind) return true;
    if (jj_la == 0 && jj_scanpos == jj_lastpos) throw jj_ls;
    return false;