JFlex
Class LexScan

java.lang.Object
  extended by JFlex.LexScan
All Implemented Interfaces:
Scanner, sym

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

The lexer of JFlex. Generated by JFlex.


Field Summary
static int CHARCLASS
           
static int COMMENT
           
static int COPY
           
static int CTOR_ARG
           
static int EATWSPNL
           
static int JAVA_CODE
           
static int MACROS
           
static int REGEXP
           
static int REGEXPSTART
           
static int REPEATEXP
           
static int STATELIST
           
static int STATES
           
static int STRING_CONTENT
          lexical states
static int YYEOF
          This character denotes the end of file
static int YYINITIAL
           
 
Fields inherited from interface JFlex.sym
ACTION, ASCII, 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()
           
 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.
 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

CTOR_ARG

public static final int CTOR_ARG
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
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 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 Scanner
Returns:
the next token
Throws:
java.io.IOException - if any I/O-Error occurs

debug_next_token

public 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.