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-rw-r--r--vendor/golang.org/x/text/internal/match.go67
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+// 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 http://unicode.org/reports/tr35/#Locale_Inheritance.
+//
+// Some of the inheritance described in this document is already handled by
+// the cldr package.
+
+import (
+ "golang.org/x/text/language"
+)
+
+// 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 NewInheritanceMatcher(t []language.Tag) *InheritanceMatcher {
+ tags := &InheritanceMatcher{make(map[language.Tag]int)}
+ for i, tag := range t {
+ ct, err := language.All.Canonicalize(tag)
+ if err != nil {
+ ct = tag
+ }
+ tags.index[ct] = i
+ }
+ return tags
+}
+
+type InheritanceMatcher struct {
+ index map[language.Tag]int
+}
+
+func (m InheritanceMatcher) Match(want ...language.Tag) (language.Tag, int, language.Confidence) {
+ for _, t := range want {
+ ct, err := language.All.Canonicalize(t)
+ if err != nil {
+ ct = t
+ }
+ conf := language.Exact
+ for {
+ if index, ok := m.index[ct]; ok {
+ return ct, index, conf
+ }
+ if ct == language.Und {
+ break
+ }
+ ct = ct.Parent()
+ conf = language.High
+ }
+ }
+ return language.Und, 0, language.No
+}