libgo/go/unicode/digit.go

   1 // Copyright 2009 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 package unicode
   6
   7 // IsDigit reports whether the rune is a decimal digit.
   8 func IsDigit(rune int) bool {
   9         if rune < 0x100 { // quick ASCII (Latin-1, really) check
  10                 return '0' <= rune && rune <= '9'
  11         }
  12         return Is(Digit, rune)
  13 }