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.
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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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package idna
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// Sparse block handling code.
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type valueRange struct {
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value uint16 // header: value:stride
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lo, hi byte // header: lo:n
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}
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type sparseBlocks struct {
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values []valueRange
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offset []uint16
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}
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var idnaSparse = sparseBlocks{
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values: idnaSparseValues[:],
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offset: idnaSparseOffset[:],
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}
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// Don't use newIdnaTrie to avoid unconditional linking in of the table.
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var trie = &idnaTrie{}
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// lookup determines the type of block n and looks up the value for b.
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// For n < t.cutoff, the block is a simple lookup table. Otherwise, the block
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// is a list of ranges with an accompanying value. Given a matching range r,
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// the value for b is by r.value + (b - r.lo) * stride.
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func (t *sparseBlocks) lookup(n uint32, b byte) uint16 {
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offset := t.offset[n]
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header := t.values[offset]
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lo := offset + 1
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hi := lo + uint16(header.lo)
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for lo < hi {
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m := lo + (hi-lo)/2
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r := t.values[m]
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if r.lo <= b && b <= r.hi {
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return r.value + uint16(b-r.lo)*header.value
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}
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if b < r.lo {
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hi = m
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} else {
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lo = m + 1
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}
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}
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return 0
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}
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