ppg.lex
Class Lexer

java.lang.Object
  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