145 lines
4.4 KiB
Go
145 lines
4.4 KiB
Go
// Copyright 2011 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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package unicode
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// Bit masks for each code point under U+0100, for fast lookup.
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const (
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pC = 1 << iota // a control character.
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pP // a punctuation character.
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pN // a numeral.
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pS // a symbolic character.
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pZ // a spacing character.
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pLu // an upper-case letter.
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pLl // a lower-case letter.
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pp // a printable character according to Go's definition.
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pg = pp | pZ // a graphical character according to the Unicode definition.
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pLo = pLl | pLu // a letter that is neither upper nor lower case.
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pLmask = pLo
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)
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// GraphicRanges defines the set of graphic characters according to Unicode.
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var GraphicRanges = []*RangeTable{
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L, M, N, P, S, Zs,
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}
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// PrintRanges defines the set of printable characters according to Go.
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// ASCII space, U+0020, is handled separately.
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var PrintRanges = []*RangeTable{
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L, M, N, P, S,
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}
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// IsGraphic reports whether the rune is defined as a Graphic by Unicode.
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// Such characters include letters, marks, numbers, punctuation, symbols, and
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// spaces, from categories L, M, N, P, S, Zs.
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func IsGraphic(r rune) bool {
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// We convert to uint32 to avoid the extra test for negative,
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// and in the index we convert to uint8 to avoid the range check.
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if uint32(r) <= MaxLatin1 {
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return properties[uint8(r)]&pg != 0
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}
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return In(r, GraphicRanges...)
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}
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// IsPrint reports whether the rune is defined as printable by Go. Such
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// characters include letters, marks, numbers, punctuation, symbols, and the
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// ASCII space character, from categories L, M, N, P, S and the ASCII space
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// character. This categorization is the same as IsGraphic except that the
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// only spacing character is ASCII space, U+0020.
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func IsPrint(r rune) bool {
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if uint32(r) <= MaxLatin1 {
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return properties[uint8(r)]&pp != 0
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}
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return In(r, PrintRanges...)
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}
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// IsOneOf reports whether the rune is a member of one of the ranges.
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// The function "In" provides a nicer signature and should be used in preference to IsOneOf.
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func IsOneOf(ranges []*RangeTable, r rune) bool {
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for _, inside := range ranges {
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if Is(inside, r) {
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return true
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}
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}
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return false
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}
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// In reports whether the rune is a member of one of the ranges.
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func In(r rune, ranges ...*RangeTable) bool {
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for _, inside := range ranges {
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if Is(inside, r) {
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return true
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}
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}
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return false
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}
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// IsControl reports whether the rune is a control character.
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// The C (Other) Unicode category includes more code points
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// such as surrogates; use Is(C, r) to test for them.
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func IsControl(r rune) bool {
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if uint32(r) <= MaxLatin1 {
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return properties[uint8(r)]&pC != 0
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}
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// All control characters are < Latin1Max.
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return false
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}
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// IsLetter reports whether the rune is a letter (category L).
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func IsLetter(r rune) bool {
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if uint32(r) <= MaxLatin1 {
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return properties[uint8(r)]&(pLmask) != 0
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}
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return isExcludingLatin(Letter, r)
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}
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// IsMark reports whether the rune is a mark character (category M).
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func IsMark(r rune) bool {
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// There are no mark characters in Latin-1.
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return isExcludingLatin(Mark, r)
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}
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// IsNumber reports whether the rune is a number (category N).
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func IsNumber(r rune) bool {
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if uint32(r) <= MaxLatin1 {
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return properties[uint8(r)]&pN != 0
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}
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return isExcludingLatin(Number, r)
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}
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// IsPunct reports whether the rune is a Unicode punctuation character
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// (category P).
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func IsPunct(r rune) bool {
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if uint32(r) <= MaxLatin1 {
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return properties[uint8(r)]&pP != 0
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}
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return Is(Punct, r)
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}
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// IsSpace reports whether the rune is a space character as defined
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// by Unicode's White Space property; in the Latin-1 space
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// this is
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// '\t', '\n', '\v', '\f', '\r', ' ', U+0085 (NEL), U+00A0 (NBSP).
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// Other definitions of spacing characters are set by category
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// Z and property Pattern_White_Space.
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func IsSpace(r rune) bool {
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// This property isn't the same as Z; special-case it.
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if uint32(r) <= MaxLatin1 {
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switch r {
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case '\t', '\n', '\v', '\f', '\r', ' ', 0x85, 0xA0:
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return true
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}
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return false
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}
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return isExcludingLatin(White_Space, r)
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}
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// IsSymbol reports whether the rune is a symbolic character.
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func IsSymbol(r rune) bool {
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if uint32(r) <= MaxLatin1 {
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return properties[uint8(r)]&pS != 0
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}
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return isExcludingLatin(Symbol, r)
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}
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