52 lines
1.3 KiB
Go
52 lines
1.3 KiB
Go
|
// Code generated by running "go generate" in golang.org/x/text. DO NOT EDIT.
|
||
|
|
|
||
|
|
// Copyright 2016 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 idna
|
||
|
|
|
||
|
|
// Sparse block handling code.
|
||
|
|
|
||
|
|
type valueRange struct {
|
||
|
|
value uint16 // header: value:stride
|
||
|
|
lo, hi byte // header: lo:n
|
||
|
|
}
|
||
|
|
|
||
|
|
type sparseBlocks struct {
|
||
|
|
values []valueRange
|
||
|
|
offset []uint16
|
||
|
|
}
|
||
|
|
|
||
|
|
var idnaSparse = sparseBlocks{
|
||
|
|
values: idnaSparseValues[:],
|
||
|
|
offset: idnaSparseOffset[:],
|
||
|
|
}
|
||
|
|
|
||
|
|
// Don't use newIdnaTrie to avoid unconditional linking in of the table.
|
||
|
|
var trie = &idnaTrie{}
|
||
|
|
|
||
|
|
// lookup determines the type of block n and looks up the value for b.
|
||
|
|
// For n < t.cutoff, the block is a simple lookup table. Otherwise, the block
|
||
|
|
// is a list of ranges with an accompanying value. Given a matching range r,
|
||
|
|
// the value for b is by r.value + (b - r.lo) * stride.
|
||
|
|
func (t *sparseBlocks) lookup(n uint32, b byte) uint16 {
|
||
|
|
offset := t.offset[n]
|
||
|
|
header := t.values[offset]
|
||
|
|
lo := offset + 1
|
||
|
|
hi := lo + uint16(header.lo)
|
||
|
|
for lo < hi {
|
||
|
|
m := lo + (hi-lo)/2
|
||
|
|
r := t.values[m]
|
||
|
|
if r.lo <= b && b <= r.hi {
|
||
|
|
return r.value + uint16(b-r.lo)*header.value
|
||
|
|
}
|
||
|
|
if b < r.lo {
|
||
|
|
hi = m
|
||
|
|
} else {
|
||
|
|
lo = m + 1
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return 0
|
||
|
|
}
|