Rune

  • A rune  is just a character in a string.

  • Represents a Unicode code point.

  • Signed 32 bit integer; distinct i32 .

  • The default value is 0 , as it's just an i32 .

  • They just work like numbers in most cases; well they are numbers.

    • For example, to lower a rune you can unicode.to_lower(r) , but you can also just r - 32  if you're only dealing with ASCII.

      • Supposedly.

  • Rune values are comparable and ordered.

Untyped Runes / Rune Literals

  • Can be used to define a rune , u8 , u16 . 

foo    := 'x'
// ^       ^
// rune    untyped rune


foo:  u8 = 'x'
// ^        ^
// u8       untyped rune
// This is valid for UTF-8 runes, for UTF-16 use u16.


foo: u16 = 'x'
// ^        ^
// u16       untyped rune

if str[i] == '\n'
// is using a rune literal as a `u8`

Other usages 

skip_whitespace :: proc(t: ^Tokenizer) {
    for {
        switch t.ch {
        case ' ', '\t', '\r', '\n':
            advance_rune(t)
        case:
            return
        }
    }
}