71 lines
1.8 KiB
Go
71 lines
1.8 KiB
Go
|
// 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.
|
||
|
|
|
||
|
|
// Package rangetable provides utilities for creating and inspecting
|
||
|
|
// unicode.RangeTables.
|
||
|
|
package rangetable
|
||
|
|
|
||
|
|
import (
|
||
|
|
"sort"
|
||
|
|
"unicode"
|
||
|
|
)
|
||
|
|
|
||
|
|
// New creates a RangeTable from the given runes, which may contain duplicates.
|
||
|
|
func New(r ...rune) *unicode.RangeTable {
|
||
|
|
if len(r) == 0 {
|
||
|
|
return &unicode.RangeTable{}
|
||
|
|
}
|
||
|
|
|
||
|
|
sort.Sort(byRune(r))
|
||
|
|
|
||
|
|
// Remove duplicates.
|
||
|
|
k := 1
|
||
|
|
for i := 1; i < len(r); i++ {
|
||
|
|
if r[k-1] != r[i] {
|
||
|
|
r[k] = r[i]
|
||
|
|
k++
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
var rt unicode.RangeTable
|
||
|
|
for _, r := range r[:k] {
|
||
|
|
if r <= 0xFFFF {
|
||
|
|
rt.R16 = append(rt.R16, unicode.Range16{Lo: uint16(r), Hi: uint16(r), Stride: 1})
|
||
|
|
} else {
|
||
|
|
rt.R32 = append(rt.R32, unicode.Range32{Lo: uint32(r), Hi: uint32(r), Stride: 1})
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Optimize RangeTable.
|
||
|
|
return Merge(&rt)
|
||
|
|
}
|
||
|
|
|
||
|
|
type byRune []rune
|
||
|
|
|
||
|
|
func (r byRune) Len() int { return len(r) }
|
||
|
|
func (r byRune) Swap(i, j int) { r[i], r[j] = r[j], r[i] }
|
||
|
|
func (r byRune) Less(i, j int) bool { return r[i] < r[j] }
|
||
|
|
|
||
|
|
// Visit visits all runes in the given RangeTable in order, calling fn for each.
|
||
|
|
func Visit(rt *unicode.RangeTable, fn func(rune)) {
|
||
|
|
for _, r16 := range rt.R16 {
|
||
|
|
for r := rune(r16.Lo); r <= rune(r16.Hi); r += rune(r16.Stride) {
|
||
|
|
fn(r)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
for _, r32 := range rt.R32 {
|
||
|
|
for r := rune(r32.Lo); r <= rune(r32.Hi); r += rune(r32.Stride) {
|
||
|
|
fn(r)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Assigned returns a RangeTable with all assigned code points for a given
|
||
|
|
// Unicode version. This includes graphic, format, control, and private-use
|
||
|
|
// characters. It returns nil if the data for the given version is not
|
||
|
|
// available.
|
||
|
|
func Assigned(version string) *unicode.RangeTable {
|
||
|
|
return assigned[version]
|
||
|
|
}
|