37 lines
1.1 KiB
Go
37 lines
1.1 KiB
Go
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// Copyright 2018 by David A. Golden. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may
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// not use this file except in compliance with the License. You may obtain
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// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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package stringprep
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import "sort"
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// RuneRange represents a close-ended range of runes: [N,M]. For a range
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// consisting of a single rune, N and M will be equal.
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type RuneRange [2]rune
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// Contains returns true if a rune is within the bounds of the RuneRange.
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func (rr RuneRange) Contains(r rune) bool {
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return rr[0] <= r && r <= rr[1]
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}
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func (rr RuneRange) isAbove(r rune) bool {
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return r <= rr[0]
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}
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// Set represents a stringprep data table used to identify runes of a
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// particular type.
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type Set []RuneRange
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// Contains returns true if a rune is within any of the RuneRanges in the
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// Set.
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func (s Set) Contains(r rune) bool {
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i := sort.Search(len(s), func(i int) bool { return s[i].Contains(r) || s[i].isAbove(r) })
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if i < len(s) && s[i].Contains(r) {
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return true
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}
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return false
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}
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