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## weka.core.mathematicalexpression
Class Scanner

    java.lang.Object
      weka.core.mathematicalexpression.Scanner

All Implemented Interfaces:
  java_cup.runtime.Scanner

    public class Scanner

extends java.lang.Object
implements java_cup.runtime.Scanner

A scanner for mathematical expressions.

Version:
  $Revision: 4942 $
Author:
  FracPete (fracpete at waikato dot ac dot nz)

Field Summary
`static int` | `YYEOF` This character denotes the end of file
`static int` | `YYINITIAL` lexical states

Constructor Summary
`Scanner(java.io.InputStream in)` Creates a new scanner.
`Scanner(java.io.InputStream r, java_cup.runtime.SymbolFactory sf)`
`Scanner(java.io.Reader in)` Creates a new scanner There is also a java.io.InputStream version of this constructor.

Method Summary
`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.
`void` | `yybegin(int newState)` Enters a new lexical state
`char` | `yycharat(int pos)` Returns the character at position `pos` from the matched text.
`void` | `yyclose()` Closes the input stream.
`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.
`void` | `yyreset(java.io.Reader reader)` Resets the scanner to read from a new input stream.
`int` | `yystate()` Returns the current lexical state.
`java.lang.String` | `yytext()` Returns the text matched by the current regular expression.

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### YYEOF

    public static final int YYEOF

  This character denotes the end of file

  See Also:
    Constant Field Values

### YYINITIAL

    public static final int YYINITIAL

  lexical states

  See Also:
    Constant Field Values

Constructor Detail

### Scanner

    public Scanner(java.io.InputStream r,
                   java_cup.runtime.SymbolFactory sf)

### Scanner

    public Scanner(java.io.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(java.io.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 Detail

### yyclose

    public final void yyclose()
                       throws java.io.IOException

  Closes the input stream.

  Throws:
    `java.io.IOException`

### yyreset

    public final void yyreset(java.io.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 java.lang.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 java.io.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:
    `java.io.IOException` - if any I/O-Error occurs

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