Package net.ontopia.topicmaps.query.parser

Class TologLexer

java.lang.Object
net.ontopia.topicmaps.query.parser.TologLexer
All Implemented Interfaces:
antlr.TokenStream
public class TologLexer extends Object implements antlr.TokenStream
A tolog lexer, to be used with the Antlr-generated parser.

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    static final int
    COMMENT
     
    static final int
    YYEOF
    This character denotes the end of file
    static final int
    YYINITIAL
    lexical states

  • Constructor Summary

    Constructors
    Constructor
    Description
    TologLexer(Reader in)
    Creates a new scanner
    TologLexer(Reader reader, TologOptions options)
     

  • Method Summary

    Modifier and Type
    Method
    Description
    TologOptions
    getOptions()
     
    int
    getStartOfToken()
     
    antlr.Token
    nextToken()
     
    antlr.Token
    nextToken2()
    Resumes scanning until the next regular expression is matched, the end of input is encountered or an I/O-Error occurs.
    final void
    yybegin(int newState)
    Enters a new lexical state
    final char
    yycharat(int pos)
    Returns the character at position pos from the matched text.
    final void
    yyclose()
    Closes the input stream.
    final int
    yylength()
    Returns the length of the matched text region.
    void
    yypushback(int number)
    Pushes the specified amount of characters back into the input stream.
    final void
    yyreset(Reader reader)
    Resets the scanner to read from a new input stream.
    final int
    yystate()
    Returns the current lexical state.
    final String
    yytext()
    Returns the text matched by the current regular expression.

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Field Details

  • Constructor Details

    • TologLexer

      public TologLexer(Reader reader, TologOptions options)

    • TologLexer

      public TologLexer(Reader in)
      Creates a new scanner
      Parameters:
      in - the java.io.Reader to read input from.

  • Method Details

    • getOptions

      public TologOptions getOptions()

    • nextToken

      public antlr.Token nextToken()
      Specified by:
      nextToken in interface antlr.TokenStream

    • getStartOfToken

      public int getStartOfToken()

    • yyclose

      public final void yyclose() throws IOException
      Closes the input stream.
      Throws:
      IOException

    • yyreset

      public final void yyreset(Reader reader)
      Resets the scanner to read from a new input stream. Does not close the old reader. All internal variables are reset, the old input stream cannot be reused (internal buffer is discarded and lost). Lexical state is set to ZZ_INITIAL. Internal scan buffer is resized down to its initial length, if it has grown.
      Parameters:
      reader - the new input stream

    • yystate

      public final int yystate()
      Returns the current lexical state.

    • yybegin

      public final void yybegin(int newState)
      Enters a new lexical state
      Parameters:
      newState - the new lexical state

    • yytext

      public final String yytext()
      Returns the text matched by the current regular expression.

    • yycharat

      public final char yycharat(int pos)
      Returns the character at position pos from the matched text. It is equivalent to yytext().charAt(pos), but faster
      Parameters:
      pos - the position of the character to fetch. A value from 0 to yylength()-1.
      Returns:
      the character at position pos

    • yylength

      public final int yylength()
      Returns the length of the matched text region.

    • yypushback

      public void yypushback(int number)
      Pushes the specified amount of characters back into the input stream. They will be read again by then next call of the scanning method
      Parameters:
      number - the number of characters to be read again. This number must not be greater than yylength()!

    • nextToken2

      public antlr.Token nextToken2() throws IOException
      Resumes scanning until the next regular expression is matched, the end of input is encountered or an I/O-Error occurs.
      Returns:
      the next token
      Throws:
      IOException - if any I/O-Error occurs