Functions for classifying characters in the ASCII range.
Despite the name, you can pass any UTF-8 characters to these functions.
It's just that none of them will be considered true. Unicode whitespace
won't return true from isWhite, etc.
Code Map
//! Functions for classifying characters in the ASCII range.
module watt.text.ascii;
enum HEX_DIGITS;
enum FULL_HEX_DIGITS;
enum DIGITS;
enum OCTAL_DIGITS;
enum LOWERCASE;
enum LETTERS;
enum UPPERCASE;
enum WHITESPACE;
enum NEWLINE;
//! Is a character alphanumeric?
fn isAlphaNum(c: dchar) bool { }
//! Is a character alphabetical?
fn isAlpha(c: dchar) bool { }
//! Is a character a lowercase alphabetical character?
fn isLower(c: dchar) bool { }
//! Is a character a uppercase alphabetical character?
fn isUpper(c: dchar) bool { }
//! Is a character a digit?
fn isDigit(c: dchar) bool { }
//! Is a character an octal digit?
fn isOctalDigit(c: dchar) bool { }
//! Is a character a hexadecimal digit?
fn isHexDigit(c: dchar) bool { }
//! Is a character whitespace?
fn isWhite(c: dchar) bool { }
//! Is a character a control character?
fn isControl(c: dchar) bool { }
//! Is a character punctuation?
fn isPunctuation(c: dchar) bool { }
//! Is a character a printable ASCII character?
fn isPrintable(c: dchar) bool { }
//! Is a given character an ASCII character?
fn isASCII(c: dchar) bool { }
//! Get the lowerspace letter of an uppercase character.
fn toLower(c: dchar) dchar { }
//! Get the upperspace letter of a lowercase character.
fn toUpper(c: dchar) dchar { }
Is a character alphanumeric?
Examples
isAlphaNum('a'); // true
isAlphaNum('A'); // true
isAlphaNum('2'); // true
isAlphaNum('あ'); // false
isAlphaNum('!'); // false
Return
true if c is alphanumeric (a-z,A-Z,0-9).
Is a character alphabetical?
Examples
isAlpha('a'); // true
isAlpha('G'); // true
isAlpha('2'); // false
Return
true if c is alphabetical (a-z,A-Z).
Is a character a lowercase alphabetical character?
Examples
isLower('a'); // true
isLower('A'); // false
Return
true if c is lowercase alphabetical (a-z).
Is a character a uppercase alphabetical character?
Examples
isLower('a'); // false
isLower('A'); // true
Return
true if c is uppercase alphabetical (A-Z).
Is a character a digit?
Examples
isDigit('4'); // true
isDigit('('); // false
Return
true if c is a digit (0-9).
Is a character an octal digit?
Examples
isOctalDigit('7'); // true
isOctalDigit('8'); // false
Return
true if c is an octal digit (0-7).
Is a character a hexadecimal digit?
Examples
isHexDigit('1'); // true
isHexDigit('f'); // true
isHexDigit('F'); // true
isHexDigit('g'); // false
Return
true if c is a hex digit (0-9,a-f,A-F).
Is a character whitespace?
The characters considered whitespace are , \t, \r, \f, \v, and \n.
Return
true if c is whitespace.
Is a character a control character?
A control character is a non printing character. Non ascii characters are not considered,
so any value over 127 will not be considered to be a control character.
Return
true if c is a control character.
Is a character punctuation?
Where punctuation is defined as a non control, non whitespace, non alphanumeric character.
Return
true if c is punctuation.
Is a character a printable ASCII character?
Return
true if c is a printable character.
Is a given character an ASCII character?
Examples
isASCII('a'); // true
isASCII('楽'); // false
Return
true if c is an ASCII character.
Get the lowerspace letter of an uppercase character.
Examples
toLower('A'); // 'a'
toLower('a'); // 'a'
toLower('2'); // '2'
Return
c, or c as a lowercase character if it's an uppercase character.
Get the upperspace letter of a lowercase character.
Examples
toLower('A'); // 'A'
toLower('a'); // 'A'
toLower('2'); // '2'
Return
c, or c as an uppercase character if it's a lowercase character.