Package org.nuxeo.ecm.core.query.sql.parser

Class Scanner

java.lang.Object
org.nuxeo.ecm.core.query.sql.parser.Scanner
All Implemented Interfaces:
java_cup.runtime.Scanner
public class Scanner extends Object implements java_cup.runtime.Scanner
Lexer for NXQL

  • Field Summary

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

  • Constructor Summary

    Constructors
    Constructor
    Description
    Scanner(InputStream in)
    Creates a new scanner.
    Scanner(Reader in)
    Creates a new scanner There is also a java.io.InputStream version of this constructor.

  • Method Summary

    Modifier and Type
    Method
    Description
    java_cup.runtime.Symbol
    next_token()
    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

    • Scanner

      public Scanner(Reader in)
      Creates a new scanner There is also a java.io.InputStream version of this constructor.
      Parameters:
      in - the java.io.Reader to read input from.

    • Scanner

      public Scanner(InputStream in)
      Creates a new scanner. There is also java.io.Reader version of this constructor.
      Parameters:
      in - the java.io.Inputstream to read input from.

  • Method Details

    • 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.
      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()!

    • next_token

      public java_cup.runtime.Symbol next_token() throws IOException
      Resumes scanning until the next regular expression is matched, the end of input is encountered or an I/O-Error occurs.
      Specified by:
      next_token in interface java_cup.runtime.Scanner
      Returns:
      the next token
      Throws:
      IOException - if any I/O-Error occurs