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49 lines
1.2 KiB
Go
49 lines
1.2 KiB
Go
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// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:generate go run gen.go gen_bits.go
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// Package runenames provides rune names from the Unicode Character Database.
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// For example, the name for '\u0100' is "LATIN CAPITAL LETTER A WITH MACRON".
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//
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// See http://www.unicode.org/Public/UCD/latest/ucd/UnicodeData.txt
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package runenames
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import (
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"sort"
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)
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// Name returns the name for r.
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func Name(r rune) string {
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i := sort.Search(len(table0), func(j int) bool {
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e := table0[j]
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rOffset := rune(e >> shiftRuneOffset)
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return r < rOffset
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})
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if i == 0 {
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return ""
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}
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e := table0[i-1]
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rOffset := rune(e >> shiftRuneOffset)
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rLength := rune(e>>shiftRuneLength) & maskRuneLength
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if r >= rOffset+rLength {
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return ""
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}
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if (e>>shiftDirect)&maskDirect != 0 {
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o := int(e>>shiftDataOffset) & maskDataOffset
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n := int(e>>shiftDataLength) & maskDataLength
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return data[o : o+n]
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}
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base := uint32(e>>shiftDataBase) & maskDataBase
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base <<= dataBaseUnit
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j := rune(e>>shiftTable1Offset) & maskTable1Offset
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j += r - rOffset
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d0 := base + uint32(table1[j-1]) // dataOffset
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d1 := base + uint32(table1[j-0]) // dataOffset + dataLength
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return data[d0:d1]
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}
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