ppg.lex
Class Lexer

java.lang.Object
  extended by ppg.lex.Lexer

public class Lexer
extends java.lang.Object

This class is a scanner generated by JFlex 1.3.5 on 4/30/06 11:48 PM from the specification file file:/Users/nystrom/xx/polyglot/src/ppg/lex/ppg.flex


Field Summary
static int CODE
          lexical states
static int COMMENT
           
static int STRING
           
static int YYEOF
          This character denotes the end of file
static int YYINITIAL
           
 
Constructor Summary
Lexer(java.io.InputStream in)
          Creates a new scanner.
Lexer(java.io.InputStream in, java.lang.String filename)
           
Lexer(java.io.Reader in)
          Creates a new scanner There is also a java.io.InputStream version of this constructor.
 
Method Summary
 Token getToken()
          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 yyreset(java.io.Reader reader)
          Closes the current stream, and 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
clone, equals, finalize, 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

CODE

public static final int CODE
lexical states

See Also:
Constant Field Values

STRING

public static final int STRING
See Also:
Constant Field Values

YYINITIAL

public static final int YYINITIAL
See Also:
Constant Field Values

COMMENT

public static final int COMMENT
See Also:
Constant Field Values
Constructor Detail

Lexer

public Lexer(java.io.InputStream in,
             java.lang.String filename)

Lexer

public Lexer(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.

Lexer

public Lexer(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)
                   throws java.io.IOException
Closes the current stream, and resets the scanner to read from a new input stream. All internal variables are reset, the old input stream cannot be reused (internal buffer is discarded and lost). Lexical state is set to YY_INITIAL.

Parameters:
reader - the new input stream
Throws:
java.io.IOException

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.


getToken

public Token getToken()
               throws java.io.IOException,
                      LexicalError
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
LexicalError