Package jflex

Class CharClasses

java.lang.Object
jflex.CharClasses
public class CharClasses extends Object
Character Classes.
Version:
JFlex 1.7.0

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    private List<IntCharSet>
    classes
    the char classes
    private static final boolean
    DEBUG
    debug flag (for char classes only)
    static final int
    maxChar
    the largest character that can be used in char classes
    private int
    maxCharUsed
    the largest character actually used in a specification
    LexScan
    scanner
     

  • Constructor Summary

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

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    check()
    Check consistency of the stored classes [debug].
    void
    dump()
    Dumps 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.
    private int[]
    getClassCodes(IntCharSet set, boolean negate)
    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(String str, boolean caseless)
    Creates a new character class for each character of the specified String.
    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(IntCharSet set, boolean caseless)
    Updates the current partition, so that the specified set of characters gets a new character class.
    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()
    Returns a string representation of the char classes stored in this class.
    String
    toString(int theClass)
    Returns 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 Details

    • DEBUG

      private static final boolean DEBUG
      debug flag (for char classes only)
      See Also:

    • maxChar

      public static final int maxChar
      the largest character that can be used in char classes
      See Also:

    • classes

      private List<IntCharSet> classes
      the char classes

    • maxCharUsed

      private int maxCharUsed
      the largest character actually used in a specification

    • scanner

      public LexScan scanner

  • Constructor Details

    • 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 Details

    • 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.
      Returns:
      unicode value.

    • 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.
      Returns:
      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.
      Parameters:
      codePoint - code point.
      Returns:
      code of the character class.

    • dump

      public void dump()
      Dumps charclasses to the dump output stream.

    • toString

      public String toString(int theClass)
      Returns a string representation of one char class
      Parameters:
      theClass - the index of the class to
      Returns:
      a String object.

    • toString

      public String toString()
      Returns a string representation of the char classes stored in this class.

      Enumerates the classes by index.

      Overrides:
      toString in class Object
      Returns:
      representation of this char class.

    • makeClass

      public void makeClass(int singleChar, boolean caseless)
      Creates a new character class for the single character singleChar.
      Parameters:
      singleChar - character.
      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:
      str - set of characters.
      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

      private int[] getClassCodes(IntCharSet set, boolean negate)
      Returns an array that contains the character class codes of all characters in the specified set of input characters.

    • 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.

      Returns:
      an array of all CharClassInterval in this char class collection.