Source File
match.go
Belonging Package
golang.org/x/text/internal
// 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 internal
// This file contains matchers that implement CLDR inheritance.
//
// See https://unicode.org/reports/tr35/#Locale_Inheritance.
//
// Some of the inheritance described in this document is already handled by
// the cldr package.
import (
)
// TODO: consider if (some of the) matching algorithm needs to be public after
// getting some feel about what is generic and what is specific.
// NewInheritanceMatcher returns a matcher that matches based on the inheritance
// chain.
//
// The matcher uses canonicalization and the parent relationship to find a
// match. The resulting match will always be either Und or a language with the
// same language and script as the requested language. It will not match
// languages for which there is understood to be mutual or one-directional
// intelligibility.
//
// A Match will indicate an Exact match if the language matches after
// canonicalization and High if the matched tag is a parent.
func ( []language.Tag) *InheritanceMatcher {
:= &InheritanceMatcher{make(map[language.Tag]int)}
for , := range {
, := language.All.Canonicalize()
if != nil {
=
}
.index[] =
}
return
}
type InheritanceMatcher struct {
index map[language.Tag]int
}
func ( InheritanceMatcher) ( ...language.Tag) (language.Tag, int, language.Confidence) {
for , := range {
, := language.All.Canonicalize()
if != nil {
=
}
:= language.Exact
for {
if , := .index[]; {
return , ,
}
if == language.Und {
break
}
= .Parent()
= language.High
}
}
return language.Und, 0, language.No
}
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