JFlex
Class LexScan

java.lang.Object
  JFlex.LexScan

All Implemented Interfaces:

java_cup.runtime.Scanner, sym

public final class LexScan
extends java.lang.Object
implements sym, java_cup.runtime.Scanner

The lexer of JFlex. Generated by JFlex.

Version:

JFlex 1.4.1, $Revision: 2.8 $, $Date: 2004/11/07 03:09:30 $

Author:

Gerwin Klein

Field Summary

(package private) int	action_line
(package private) java.util.Vector	actions
(package private) java.lang.StringBuffer	actionText
(package private) int	balance
(package private) boolean	bolUsed
(package private) int	bufferSize
(package private) boolean	caseless
static int	CHARCLASS
(package private) boolean	charCount
(package private) java.lang.String	classCode
(package private) java.lang.String	className
(package private) boolean	columnCount
static int	COMMENT
(package private) int	commentbalance
static int	COPY
(package private) boolean	cupCompatible
(package private) boolean	cupDebug
(package private) java.lang.String	cupSymbol
(package private) boolean	debugOption
static int	EATWSPNL
(package private) boolean	eofclose
(package private) java.lang.String	eofCode
(package private) java.lang.String	eofThrow
(package private) java.lang.String	eofVal
(package private) java.io.File	file
(package private) java.util.Stack	files
(package private) java.lang.String	functionName
(package private) boolean	inclusive_states
(package private) java.lang.String	initCode
(package private) java.lang.String	initThrow
(package private) boolean	isAbstract
(package private) java.lang.String	isExtending
(package private) boolean	isFinal
(package private) java.lang.String	isImplementing
(package private) boolean	isInteger
(package private) boolean	isIntWrap
(package private) boolean	isPublic
(package private) boolean	isYYEOF
static int	JAVA_CODE
(package private) java.lang.String	lexThrow
(package private) boolean	lineCount
(package private) boolean	lookAheadUsed
(package private) boolean	macroDefinition
static int	MACROS
(package private) boolean	notUnix
(package private) boolean	packed
static int	REGEXP
static int	REGEXPSTART
static int	REPEATEXP
(package private) java.lang.String	scanErrorException
(package private) boolean	standalone
static int	STATELIST
(package private) LexicalStates	states
static int	STATES
(package private) java.lang.StringBuffer	string
static int	STRING_CONTENT lexical states
(package private) Timer	t
(package private) java.lang.String	tokenType
(package private) java.lang.StringBuffer	userCode
(package private) boolean	useRowMap
(package private) java.lang.String	visibility
static int	YYEOF This character denotes the end of file
static int	YYINITIAL

Fields inherited from interface JFlex.sym

ACTION, BANG, BAR, CCLASS, CCLASSNOT, CHAR, CHAR_I, CLOSEBRACKET, CLOSECLASS, COMMA, CONCAT, DASH, DELIMITER, DIGITCLASS, DOLLAR, EOF, EOFRULE, EQUALS, error, FULL, HAT, IDENT, JLETTERCLASS, JLETTERDIGITCLASS, LBRACE, LESSTHAN, LETTERCLASS, LOOKAHEAD, LOWERCLASS, MACROUSE, MORETHAN, NOACTION, OPENBRACKET, OPENCLASS, PLUS, POINT, QUESTION, RBRACE, REGEXPEND, REPEAT, STAR, STRING, STRING_I, TILDE, UNICODE, UPPERCLASS, USERCODE

Constructor Summary

LexScan(java.io.InputStream in)
Creates a new scanner.

LexScan(java.io.Reader in)
Creates a new scanner There is also a java.io.InputStream version of this constructor.

Method Summary

static java.lang.String	conc(java.lang.Object a, java.lang.Object b)
static java.lang.String	concExc(java.lang.Object a, java.lang.Object b)
int	currentLine()
java_cup.runtime.Symbol	debug_next_token() Same as next_token but also prints the token to standard out for debugging.
static void	main(java.lang.String[] argv) Runs the scanner on input files.
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	setFile(java.io.File file)
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.
boolean	yymoreStreams() Returns true iff there are still streams left to read from on the stream stack.
void	yypopStream() Closes the current input stream and continues to read from the one on top of the stream stack.
void	yypushback(int number) Pushes the specified amount of characters back into the input stream.
void	yypushStream(java.io.Reader reader) Stores the current input stream on a stack, and reads from a new 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

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

STRING_CONTENT

public static final int STRING_CONTENT

lexical states

See Also:

Constant Field Values

REGEXPSTART

public static final int REGEXPSTART

See Also:

Constant Field Values

MACROS

public static final int MACROS

See Also:

Constant Field Values

STATELIST

public static final int STATELIST

See Also:

Constant Field Values

EATWSPNL

public static final int EATWSPNL

See Also:

Constant Field Values

CHARCLASS

public static final int CHARCLASS

See Also:

Constant Field Values

JAVA_CODE

public static final int JAVA_CODE

See Also:

Constant Field Values

REGEXP

public static final int REGEXP

See Also:

Constant Field Values

YYINITIAL

public static final int YYINITIAL

See Also:

Constant Field Values

REPEATEXP

public static final int REPEATEXP

See Also:

Constant Field Values

COMMENT

public static final int COMMENT

See Also:

Constant Field Values

STATES

public static final int STATES

See Also:

Constant Field Values

COPY

public static final int COPY

See Also:

Constant Field Values

balance

int balance

commentbalance

int commentbalance

action_line

int action_line

bufferSize

int bufferSize

file

java.io.File file

files

java.util.Stack files

userCode

java.lang.StringBuffer userCode

classCode

java.lang.String classCode

initCode

java.lang.String initCode

initThrow

java.lang.String initThrow

eofCode

java.lang.String eofCode

eofThrow

java.lang.String eofThrow

lexThrow

java.lang.String lexThrow

eofVal

java.lang.String eofVal

scanErrorException

java.lang.String scanErrorException

cupSymbol

java.lang.String cupSymbol

actionText

java.lang.StringBuffer actionText

string

java.lang.StringBuffer string

charCount

boolean charCount

lineCount

boolean lineCount

columnCount

boolean columnCount

cupCompatible

boolean cupCompatible

cupDebug

boolean cupDebug

isInteger

boolean isInteger

isIntWrap

boolean isIntWrap

isYYEOF

boolean isYYEOF

notUnix

boolean notUnix

isPublic

boolean isPublic

isFinal

boolean isFinal

isAbstract

boolean isAbstract

lookAheadUsed

boolean lookAheadUsed

bolUsed

boolean bolUsed

standalone

boolean standalone

debugOption

boolean debugOption

useRowMap

boolean useRowMap

packed

boolean packed

caseless

boolean caseless

inclusive_states

boolean inclusive_states

eofclose

boolean eofclose

isImplementing

java.lang.String isImplementing

isExtending

java.lang.String isExtending

className

java.lang.String className

functionName

java.lang.String functionName

tokenType

java.lang.String tokenType

visibility

java.lang.String visibility

states

LexicalStates states

actions

java.util.Vector actions

macroDefinition

boolean macroDefinition

t

Timer t

Constructor Detail

LexScan

public LexScan(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.

LexScan

public LexScan(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

currentLine

public int currentLine()

setFile

public void setFile(java.io.File file)

conc

public static java.lang.String conc(java.lang.Object a,
                                    java.lang.Object b)

concExc

public static java.lang.String concExc(java.lang.Object a,
                                       java.lang.Object b)

yyclose

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

Closes the input stream.

Throws:

java.io.IOException

yypushStream

public final void yypushStream(java.io.Reader reader)

Stores the current input stream on a stack, and reads from a new stream. Lexical state, line, char, and column counting remain untouched. The current input stream can be restored with yypopstream (usually in an <> action).

Parameters:

reader - the new input stream to read from

See Also:

yypopStream()

yypopStream

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

Closes the current input stream and continues to read from the one on top of the stream stack.

Throws:

java.util.EmptyStackException - if there is no further stream to read from.

java.io.IOException - if there was an error in closing the stream.

See Also:

yypushStream(java.io.Reader)

yymoreStreams

public final boolean yymoreStreams()

Returns true iff there are still streams left to read from on the stream stack.

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

See Also:

yypushStream(java.io.Reader), yypopStream()

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

debug_next_token

public java_cup.runtime.Symbol debug_next_token()
                                         throws java.io.IOException

Same as next_token but also prints the token to standard out for debugging. This code was contributed by Karl Meissner

Throws:

java.io.IOException

main

public static void main(java.lang.String[] argv)

Runs the scanner on input files. This main method is the debugging routine for the scanner. It prints debugging information about each returned token to System.out until the end of file is reached, or an error occured.

Parameters:

argv - the command line, contains the filenames to run the scanner on.