Class: CharacterSet

• Inheritance
• Description
• Class protocol
  • instance creation
• Instance protocol
  • accessing
  • adding & removing
  • comparing
  • copying-private
  • initialization
  • queries
  • set operations

Inheritance:

   Object
   |
   +--Collection
      |
      +--CharacterSet

Package:

stx:libbasic2

Category:

Collections-Unordered

Version:

rev: 1.6 date: 2019/05/27 13:04:14

user: cg

file: CharacterSet.st directory: libbasic2

module: stx stc-classLibrary: libbasic2

Author:

Claus Gittinger

Description:

Used to represent 8-bit character sets (for now) as a bitmap.
Bit[n] is set, if Character codePoint:(n-1) is included in the set.

Class protocol:

 allSingleByteCharacters

return a new character set, which contains all single-byte characters

 empty

return a new, empty character set

 new

return a new, empty character set

 nonSeparators

return a new character set, which contains any but whitespace characters

 separators

return a new character set, which contains all whitespace characters

Instance protocol:

 byteArrayMap

 add: aCharacter

add aCharacter to the collection.
Returns aCharacter (sigh)

 remove: aCharacter ifAbsent: exceptionValue

(comment from inherited method)
search for the first element, which is equal to anObject;
if found, remove and return it.
If not found, return the value of the exceptionBlock.
Uses equality compare (=) to search for the occurrence.
An error is raised here - it is to be implemented by a concrete subclass.

 = something

 hash

 postCopy

make sure that the bitmap is not shared with the copy

 addAllSingleByteCharacters

(256 / 8)

 initialize

empty

 setByteArrayMap: aByteArray

 do: aBlock

(comment from inherited method)
evaluate the argument, aBlock for each element

 includes: aCharacter

Return true if the set contains aCharacter

 size

(comment from inherited method)
return the number of elements in the receiver.
This is usually redefined in subclasses for more performance.

 complement

return a character set containing all characters (from codepoint 0 to 255),
which are NOT included in the receiver