jflex

Class ArchaicLineBreakScanner

java.lang.Object

jflex.ArchaicLineBreakScanner

public final class ArchaicLineBreakScanner
extends Object

Scans the Unicode.org data file format for LineBreak-X.txt for Unicode version 3.0, populating unicodeVersion.propertyValueIntervals and unicodeVersion.usedPropertyValueAliases. From Unicode version 3.1 onward, the LineBreak(-X.X.X).txt file format changed to the common enumerated property format, which can be scanned using the grammar in EnumeratedPropertyFileScanner.flex.

Field Summary

Fields

Modifier and Type	Field and Description
static int	BEGIN_RANGE
static int	COMMENT_LINE
static int	END_RANGE lexical states
static int	PROPERTY_VALUE
static int	TWO_LINE_RANGE
static int	YYEOF This character denotes the end of file
static int	YYINITIAL

Constructor Summary

Constructors

Constructor and Description
ArchaicLineBreakScanner(InputStream in, jflex.UnicodeVersion unicodeVersion) Creates a new scanner.
ArchaicLineBreakScanner(Reader in, jflex.UnicodeVersion unicodeVersion) Creates a new scanner There is also a java.io.InputStream version of this constructor.

Method Summary

Methods

Modifier and Type	Method and Description
void	addPropertyValueIntervals()
int	scan() 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	yypushback(int number) Pushes the specified amount of characters back into the input stream.
void	yyreset(Reader reader) Resets the scanner to read from a new input stream.
int	yystate() Returns the current lexical state.
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

END_RANGE

public static final int END_RANGE

lexical states

See Also:

Constant Field Values

YYINITIAL

public static final int YYINITIAL

See Also:

Constant Field Values

COMMENT_LINE

public static final int COMMENT_LINE

See Also:

Constant Field Values

PROPERTY_VALUE

public static final int PROPERTY_VALUE

See Also:

Constant Field Values

TWO_LINE_RANGE

public static final int TWO_LINE_RANGE

See Also:

Constant Field Values

BEGIN_RANGE

public static final int BEGIN_RANGE

See Also:

Constant Field Values

Constructor Detail

ArchaicLineBreakScanner

public ArchaicLineBreakScanner(Reader in,
                       jflex.UnicodeVersion unicodeVersion)

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.

ArchaicLineBreakScanner

public ArchaicLineBreakScanner(InputStream in,
                       jflex.UnicodeVersion unicodeVersion)

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

addPropertyValueIntervals

public void addPropertyValueIntervals()

yyclose

public final void yyclose()
                   throws IOException

Closes the input stream.

Throws:

IOException

yyreset

public final void yyreset(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 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()!

scan

public int scan()
         throws IOException

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