jflex

Class CharClasses

java.lang.Object

jflex.CharClasses

public class CharClasses
extends Object

Version:

JFlex 1.7.0-SNAPSHOT

Author:

Gerwin Klein

Field Summary

Fields

Modifier and Type	Field and Description
static int	maxChar the largest character that can be used in char classes
LexScan	scanner

Constructor Summary

Constructors

Constructor and Description
CharClasses() Constructs a new CharClasses object.

Method Summary

Methods

Modifier and Type	Method and Description
void	check() Check consistency of the stored classes [debug].
void	dump() Dump charclasses to the dump output stream
int	getClassCode(int codePoint) Returns the code of the character class the specified character belongs to.
int[]	getClassCodes(List<Interval> intervalList) Returns an array that contains the character class codes of all characters in the specified set of input characters.
CharClassInterval[]	getIntervals() Returns an array of all CharClassIntervals in this char class collection.
int	getMaxCharCode() Returns the greatest Unicode value of the current input character set.
int[]	getNotClassCodes(List<Interval> intervalList) Returns an array that contains the character class codes of all characters that are not in the specified set of input characters.
int	getNumClasses() Returns the current number of character classes.
void	init(int maxCharCode, LexScan scanner) Provides space for classes of characters from 0 to maxCharCode.
void	makeClass(int singleChar, boolean caseless) Creates a new character class for the single character singleChar.
void	makeClass(IntCharSet set, boolean caseless) Updates the current partition, so that the specified set of characters gets a new character class.
void	makeClass(List<Interval> l, boolean caseless) Updates the current partition, so that the specified set of characters gets a new character class.
void	makeClass(String str, boolean caseless) Creates a new character class for each character of the specified String.
void	makeClassNot(List<Interval> l, boolean caseless) Updates the current partition, so that the set of all characters not contained in the specified set of characters gets a new character class.
void	setMaxCharCode(int maxCharCode) Sets the largest Unicode value of the current input character set.
String	toString() Return a string representation of the char classes stored in this class.
String	toString(int theClass) Return a string representation of one char class

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

maxChar

public static final int maxChar

the largest character that can be used in char classes

See Also:

Constant Field Values

scanner

public LexScan scanner

Constructor Detail

CharClasses

public CharClasses()

Constructs a new CharClasses object. CharClasses.init() is delayed until UnicodeProperties.init() has been called, since the max char code won't be known until then.

Method Detail

init

public void init(int maxCharCode,
        LexScan scanner)

Provides space for classes of characters from 0 to maxCharCode. Initially all characters are in class 0.

Parameters:

maxCharCode - the last character code to be considered. (127 for 7bit Lexers, 255 for 8bit Lexers and UnicodeProperties.getMaximumCodePoint() for Unicode Lexers).

scanner - the scanner containing the UnicodeProperties instance from which caseless partitions are obtained.

getMaxCharCode

public int getMaxCharCode()

Returns the greatest Unicode value of the current input character set.

setMaxCharCode

public void setMaxCharCode(int maxCharCode)

Sets the largest Unicode value of the current input character set.

Parameters:

maxCharCode - the largest character code, used for the scanner (i.e. %7bit, %8bit, %16bit etc.)

getNumClasses

public int getNumClasses()

Returns the current number of character classes.

makeClass

public void makeClass(IntCharSet set,
             boolean caseless)

Updates the current partition, so that the specified set of characters gets a new character class. Characters that are elements of set are not in the same equivalence class with characters that are not elements of set.

Parameters:

set - the set of characters to distinguish from the rest

caseless - if true upper/lower/title case are considered equivalent

getClassCode

public int getClassCode(int codePoint)

Returns the code of the character class the specified character belongs to.

dump

public void dump()

Dump charclasses to the dump output stream

toString

public String toString(int theClass)

Return a string representation of one char class

Parameters:

theClass - the index of the class to

toString

public String toString()

Return a string representation of the char classes stored in this class. Enumerates the classes by index.

Overrides:

toString in class Object

makeClass

public void makeClass(int singleChar,
             boolean caseless)

Creates a new character class for the single character singleChar.

Parameters:

caseless - if true upper/lower/title case are considered equivalent

makeClass

public void makeClass(String str,
             boolean caseless)

Creates a new character class for each character of the specified String.

Parameters:

caseless - if true upper/lower/title case are considered equivalent

makeClass

public void makeClass(List<Interval> l,
             boolean caseless)

Updates the current partition, so that the specified set of characters gets a new character class. Characters that are elements of the set l are not in the same equivalence class with characters that are not elements of the set l.

Parameters:

l - a List of Interval objects. This List represents a set of characters. The set of characters is the union of all intervals in the List.

caseless - if true upper/lower/title case are considered equivalent

makeClassNot

public void makeClassNot(List<Interval> l,
                boolean caseless)

Updates the current partition, so that the set of all characters not contained in the specified set of characters gets a new character class. Characters that are elements of the set v are not in the same equivalence class with characters that are not elements of the set v. This method is equivalent to makeClass(v)

Parameters:

l - a List of Interval objects. This List represents a set of characters. The set of characters is the union of all intervals in the List.

caseless - if true upper/lower/title case are considered equivalent

getClassCodes

public int[] getClassCodes(List<Interval> intervalList)

Returns an array that contains the character class codes of all characters in the specified set of input characters.

Parameters:

intervalList - a List of Intervals, the set of characters to get the class codes for

Returns:

an array with the class codes for intervalList

getNotClassCodes

public int[] getNotClassCodes(List<Interval> intervalList)

Returns an array that contains the character class codes of all characters that are not in the specified set of input characters.

Parameters:

intervalList - a List of Intervals, the complement of the set of characters to get the class codes for

Returns:

an array with the class codes for the complement of intervalList

check

public void check()

Check consistency of the stored classes [debug]. all classes must be disjoint, checks if all characters have a class assigned.

getIntervals

public CharClassInterval[] getIntervals()

Returns an array of all CharClassIntervals in this char class collection. The array is ordered by char code, i.e. result[i+1].start = result[i].end+1 Each CharClassInterval contains the number of the char class it belongs to.