func CharClass(negated bool, table *unicode.RangeTable) Matcher {
var t unicode.RangeTable
t.R16 = make([]unicode.Range16, len(table.R16))
copy(t.R16, table.R16)
t.R32 = make([]unicode.Range32, len(table.R32))
copy(t.R32, table.R32)
t.LatinOffset = table.LatinOffset
return charClassMatcher{negated, t}
}
func OneOf(chars ...rune) Matcher {
if len(chars) == 0 {
return Fail()
}
var t unicode.RangeTable
sort.Sort(utf8betical(chars))
for _, ch := range chars {
if ch >= 0x10000 {
t.R32 = append(t.R32, unicode.Range32{Lo: uint32(ch), Hi: uint32(ch), Stride: 1})
} else {
t.R16 = append(t.R16, unicode.Range16{Lo: uint16(ch), Hi: uint16(ch), Stride: 1})
if ch < 0x100 {
t.LatinOffset += 1
}
}
}
return charClassMatcher{false, t}
}
func Range(lo, hi rune) Matcher {
if lo > hi {
return Fail()
}
var t unicode.RangeTable
if lo >= 0x10000 {
t.R32 = append(t.R32, unicode.Range32{Lo: uint32(lo), Hi: uint32(hi), Stride: 1})
} else if hi < 0x10000 {
t.R16 = append(t.R16, unicode.Range16{Lo: uint16(lo), Hi: uint16(hi), Stride: 1})
if hi < 0x100 {
t.LatinOffset = 1
}
} else {
t.R16 = append(t.R16, unicode.Range16{Lo: uint16(lo), Hi: 0xffff, Stride: 1})
t.R32 = append(t.R32, unicode.Range32{Lo: 0x10000, Hi: uint32(hi), Stride: 1})
}
return charClassMatcher{false, t}
}