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6.25 Character
- Defined in namespace Smalltalk
- Category: Language-Data types
- My instances represent the 256 characters of the character set. I provide
messages to translate between integers and character objects, and provide
names for some of the common unprintable characters.
6.25.1 Character class: built ins
- asciiValue: anInteger
- Returns the character object corresponding to anInteger. Error if anInteger is not an integer, or not in 0..255. #codePoint:, #asciiValue: and #value: are synonyms.
- codePoint: anInteger
- Returns the character object corresponding to anInteger. Error if anInteger is not an integer, or not in 0..255. #codePoint:, #asciiValue: and #value: are synonyms.
- value: anInteger
- Returns the character object corresponding to anInteger. Error if anInteger is not an integer, or not in 0..255. #codePoint:, #asciiValue: and #value: are synonyms.
6.25.2 Character class: constants
- backspace
- Returns the character 'backspace'
- bell
- Returns the character 'bel'
- cr
- Returns the character 'cr'
- eof
- Returns the character 'eof', also known as 'sub'
- eot
- Returns the character 'eot', also known as 'Ctrl-D'
- esc
- Returns the character 'esc'
- lf
- Returns the character 'lf', also known as 'nl'
- newPage
- Returns the character 'newPage', also known as 'ff'
- nl
- Returns the character 'nl', also known as 'lf'
- nul
- Returns the character 'nul'
- space
- Returns the character 'space'
- tab
- Returns the character 'tab'
6.25.3 Character class: initializing lookup tables
- initialize
- Initialize the lookup table which is used to make case and digit-to-char conversions faster. Indices in Table are ASCII values incremented by one. Indices 1-256 classify chars (0 = nothing special, 2 = separator, 48 = digit, 55 = uppercase, 3 = lowercase), indices 257-512 map to lowercase chars, indices 513-768 map to uppercase chars.
6.25.4 Character class: Instance creation
- digitValue: anInteger
- Returns a character that corresponds to anInteger. 0-9 map to $0-$9, 10-35 map to $A-$Z
6.25.5 Character class: testing
- isIdentity
- Answer whether x = y implies x == y for instances of the receiver
- isImmediate
- Answer whether, if x is an instance of the receiver, x copy == x
6.25.6 Character: built ins
- = char
- Boolean return value; true if the characters are equal
- asciiValue
- Returns the integer value corresponding to self. #codePoint, #asciiValue, #value, and #asInteger are synonyms.
- asInteger
- Returns the integer value corresponding to self. #codePoint, #asciiValue, #value, and #asInteger are synonyms.
- codePoint
- Returns the integer value corresponding to self. #codePoint, #asciiValue, #value, and #asInteger are synonyms.
- value
- Returns the integer value corresponding to self. #codePoint, #asciiValue, #value, and #asInteger are synonyms.
6.25.7 Character: Coercion methods
- asLowercase
- Returns self as a lowercase character if it's an uppercase letter, otherwise returns the character unchanged.
- asString
- Returns the character self as a string.
- asSymbol
- Returns the character self as a symbol.
- asUppercase
- Returns self as a uppercase character if it's an lowercase letter, otherwise returns the character unchanged.
6.25.8 Character: comparing
- < aCharacter
- Compare the character's ASCII value. Answer whether the receiver's is the least.
- <= aCharacter
- Compare the character's ASCII value. Answer whether the receiver's is the least or their equal.
- > aCharacter
- Compare the character's ASCII value. Answer whether the receiver's is the greatest.
- >= aCharacter
- Compare the character's ASCII value. Answer whether the receiver's is the greatest or their equal.
6.25.9 Character: converting
- digitValue
- Returns the value of self interpreted as a digit. Here, 'digit' means either 0-9, or A-Z, which maps to 10-35.
6.25.10 Character: printing
- displayOn: aStream
- Print a representation of the receiver on aStream. Unlike #printOn:, this method strips the leading dollar.
- printOn: aStream
- Store a representation of the receiver on aStream
6.25.11 Character: storing
- storeOn: aStream
- Store Smalltalk code compiling to the receiver on aStream
6.25.12 Character: testing
- isAlphaNumeric
- True if self is a letter or a digit
- isDigit
- True if self is a 0-9 digit
- isLetter
- True if self is an upper- or lowercase letter
- isLowercase
- True if self is a lowercase letter
- isPunctuation
- Returns true if self is one of '.,:;!?'
- isSeparator
- Returns true if self is a space, cr, tab, nl, or newPage
- isUppercase
- True if self is uppercase
- isVowel
- Returns true if self is a, e, i, o, or u; case insensitive
6.25.13 Character: testing functionality
- isCharacter
- Answer True. We're definitely characters
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