// Copyright 2015 The Go Authors. All rights reserved.// Use of this source code is governed by a BSD-style// license that can be found in the LICENSE file.// +build ignorepackagemain// elem is an entry of the width trie. The high byte is used to encode the type// of the rune. The low byte is used to store the index to a mapping entry in// the inverseData array.typeelemuint16const(tagNeutralelem=iota<<typeShifttagAmbiguoustagWidetagNarrowtagFullwidthtagHalfwidth)const(numTypeBits=3typeShift=16-numTypeBits// tagNeedsFold is true for all fullwidth and halfwidth runes except for// the Won sign U+20A9.tagNeedsFold=0x1000// The Korean Won sign is halfwidth, but SHOULD NOT be mapped to a wide// variant.wonSignrune=0x20A9)