1// Copyright 2015 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//go:build ignore
6// +build ignore
7
8package main
9
10// elem is an entry of the width trie. The high byte is used to encode the type
11// of the rune. The low byte is used to store the index to a mapping entry in
12// the inverseData array.
13type elem uint16
14
15const (
16	tagNeutral elem = iota << typeShift
17	tagAmbiguous
18	tagWide
19	tagNarrow
20	tagFullwidth
21	tagHalfwidth
22)
23
24const (
25	numTypeBits = 3
26	typeShift   = 16 - numTypeBits
27
28	// tagNeedsFold is true for all fullwidth and halfwidth runes except for
29	// the Won sign U+20A9.
30	tagNeedsFold = 0x1000
31
32	// The Korean Won sign is halfwidth, but SHOULD NOT be mapped to a wide
33	// variant.
34	wonSign rune = 0x20A9
35)
36