com.cburch.editor.scanners
Class JavaScanner

java.lang.Object
  com.cburch.editor.scanners.JavaScanner

All Implemented Interfaces:

Scanner<Token>

public class JavaScanner
extends java.lang.Object
implements Scanner<Token>

This class is a scanner generated by JFlex 1.4.1 on 7/5/05 8:15 AM from the specification file JavaScanner.lex

Field Summary

static int	YYEOF This character denotes the end of file
static int	YYINITIAL lexical states

Constructor Summary

JavaScanner()
Constructs a JavaScanner reading a null document.

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

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

Method Summary

com.cburch.editor.scanners.JavaScanner.JavaToken	nextToken() Resumes scanning until the next regular expression is matched, the end of input is encountered or an I/O-Error occurs.
void	reset(java.io.Reader reader) Closes the current input stream, and resets the scanner to read from a new input stream.
void	reset(java.io.Reader reader, Token token) Resets the scanner to its state just after reading the given token from the given reader.
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

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

YYINITIAL

public static final int YYINITIAL

lexical states

See Also:

Constant Field Values

Constructor Detail

JavaScanner

public JavaScanner()

Constructs a JavaScanner reading a null document. This null document will never be used; the tokenizer will always initialize the reader through a reset method before ever reading any tokens.

JavaScanner

public JavaScanner(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.

JavaScanner

public JavaScanner(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

reset

public void reset(java.io.Reader reader,
                  Token token)

Description copied from interface: Scanner

Resets the scanner to its state just after reading the given token from the given reader. Normally, an implementation would just use the token's getEndOffset method to reset the current position; but depending on the scanner, the token may hold other state to restore also.

Specified by:

reset in interface Scanner<Token>

Parameters:

reader - the new input.

token - the token after which we will start.

reset

public void reset(java.io.Reader reader)

Description copied from interface: Scanner

Closes the current input stream, and resets the scanner to read from a new input stream. All internal variables are reset; the old input stream cannot be reused. (The content of the internal buffer is discarded and lost.) The lexical state is set to the initial state.

Specified by:

reset in interface Scanner<Token>

Parameters:

reader - The new input.

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()!

nextToken

public com.cburch.editor.scanners.JavaScanner.JavaToken nextToken()
                                                           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:

nextToken in interface Scanner<Token>

Returns:

the next token

Throws:

java.io.IOException - if any I/O-Error occurs