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author | 2019-04-27 20:38:39 +0900 | |
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committer | 2019-04-27 20:40:37 +0900 | |
commit | 4d11ca17d0f73f5bd783f45900118295fdfed46b (patch) | |
tree | cce8575b02ac850d2b30ec12a5c4083c48e85c6c /src/dma/vendor/golang.org/x/text/internal/language/compact/language.go | |
parent | 07e4a96e4996f3d39b92dd601b3ed0d23bfbaa0c (diff) |
barometer: update DMA's vendoring packages
Change-Id: I0578b094f1ecdaed20c906be2ba29d51b8089d7c
Signed-off-by: Tomofumi Hayashi <tohayash@redhat.com>
Diffstat (limited to 'src/dma/vendor/golang.org/x/text/internal/language/compact/language.go')
-rw-r--r-- | src/dma/vendor/golang.org/x/text/internal/language/compact/language.go | 260 |
1 files changed, 260 insertions, 0 deletions
diff --git a/src/dma/vendor/golang.org/x/text/internal/language/compact/language.go b/src/dma/vendor/golang.org/x/text/internal/language/compact/language.go new file mode 100644 index 00000000..83816a72 --- /dev/null +++ b/src/dma/vendor/golang.org/x/text/internal/language/compact/language.go @@ -0,0 +1,260 @@ +// Copyright 2013 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. + +//go:generate go run gen.go gen_index.go -output tables.go +//go:generate go run gen_parents.go + +package compact + +// TODO: Remove above NOTE after: +// - verifying that tables are dropped correctly (most notably matcher tables). + +import ( + "strings" + + "golang.org/x/text/internal/language" +) + +// Tag represents a BCP 47 language tag. It is used to specify an instance of a +// specific language or locale. All language tag values are guaranteed to be +// well-formed. +type Tag struct { + // NOTE: exported tags will become part of the public API. + language ID + locale ID + full fullTag // always a language.Tag for now. +} + +const _und = 0 + +type fullTag interface { + IsRoot() bool + Parent() language.Tag +} + +// Make a compact Tag from a fully specified internal language Tag. +func Make(t language.Tag) (tag Tag) { + if region := t.TypeForKey("rg"); len(region) == 6 && region[2:] == "zzzz" { + if r, err := language.ParseRegion(region[:2]); err == nil { + tFull := t + t, _ = t.SetTypeForKey("rg", "") + // TODO: should we not consider "va" for the language tag? + var exact1, exact2 bool + tag.language, exact1 = FromTag(t) + t.RegionID = r + tag.locale, exact2 = FromTag(t) + if !exact1 || !exact2 { + tag.full = tFull + } + return tag + } + } + lang, ok := FromTag(t) + tag.language = lang + tag.locale = lang + if !ok { + tag.full = t + } + return tag +} + +// Tag returns an internal language Tag version of this tag. +func (t Tag) Tag() language.Tag { + if t.full != nil { + return t.full.(language.Tag) + } + tag := t.language.Tag() + if t.language != t.locale { + loc := t.locale.Tag() + tag, _ = tag.SetTypeForKey("rg", strings.ToLower(loc.RegionID.String())+"zzzz") + } + return tag +} + +// IsCompact reports whether this tag is fully defined in terms of ID. +func (t *Tag) IsCompact() bool { + return t.full == nil +} + +// MayHaveVariants reports whether a tag may have variants. If it returns false +// it is guaranteed the tag does not have variants. +func (t Tag) MayHaveVariants() bool { + return t.full != nil || int(t.language) >= len(coreTags) +} + +// MayHaveExtensions reports whether a tag may have extensions. If it returns +// false it is guaranteed the tag does not have them. +func (t Tag) MayHaveExtensions() bool { + return t.full != nil || + int(t.language) >= len(coreTags) || + t.language != t.locale +} + +// IsRoot returns true if t is equal to language "und". +func (t Tag) IsRoot() bool { + if t.full != nil { + return t.full.IsRoot() + } + return t.language == _und +} + +// Parent returns the CLDR parent of t. In CLDR, missing fields in data for a +// specific language are substituted with fields from the parent language. +// The parent for a language may change for newer versions of CLDR. +func (t Tag) Parent() Tag { + if t.full != nil { + return Make(t.full.Parent()) + } + if t.language != t.locale { + // Simulate stripping -u-rg-xxxxxx + return Tag{language: t.language, locale: t.language} + } + // TODO: use parent lookup table once cycle from internal package is + // removed. Probably by internalizing the table and declaring this fast + // enough. + // lang := compactID(internal.Parent(uint16(t.language))) + lang, _ := FromTag(t.language.Tag().Parent()) + return Tag{language: lang, locale: lang} +} + +// returns token t and the rest of the string. +func nextToken(s string) (t, tail string) { + p := strings.Index(s[1:], "-") + if p == -1 { + return s[1:], "" + } + p++ + return s[1:p], s[p:] +} + +// LanguageID returns an index, where 0 <= index < NumCompactTags, for tags +// for which data exists in the text repository.The index will change over time +// and should not be stored in persistent storage. If t does not match a compact +// index, exact will be false and the compact index will be returned for the +// first match after repeatedly taking the Parent of t. +func LanguageID(t Tag) (id ID, exact bool) { + return t.language, t.full == nil +} + +// RegionalID returns the ID for the regional variant of this tag. This index is +// used to indicate region-specific overrides, such as default currency, default +// calendar and week data, default time cycle, and default measurement system +// and unit preferences. +// +// For instance, the tag en-GB-u-rg-uszzzz specifies British English with US +// settings for currency, number formatting, etc. The CompactIndex for this tag +// will be that for en-GB, while the RegionalID will be the one corresponding to +// en-US. +func RegionalID(t Tag) (id ID, exact bool) { + return t.locale, t.full == nil +} + +// LanguageTag returns t stripped of regional variant indicators. +// +// At the moment this means it is stripped of a regional and variant subtag "rg" +// and "va" in the "u" extension. +func (t Tag) LanguageTag() Tag { + if t.full == nil { + return Tag{language: t.language, locale: t.language} + } + tt := t.Tag() + tt.SetTypeForKey("rg", "") + tt.SetTypeForKey("va", "") + return Make(tt) +} + +// RegionalTag returns the regional variant of the tag. +// +// At the moment this means that the region is set from the regional subtag +// "rg" in the "u" extension. +func (t Tag) RegionalTag() Tag { + rt := Tag{language: t.locale, locale: t.locale} + if t.full == nil { + return rt + } + b := language.Builder{} + tag := t.Tag() + // tag, _ = tag.SetTypeForKey("rg", "") + b.SetTag(t.locale.Tag()) + if v := tag.Variants(); v != "" { + for _, v := range strings.Split(v, "-") { + b.AddVariant(v) + } + } + for _, e := range tag.Extensions() { + b.AddExt(e) + } + return t +} + +// FromTag reports closest matching ID for an internal language Tag. +func FromTag(t language.Tag) (id ID, exact bool) { + // TODO: perhaps give more frequent tags a lower index. + // TODO: we could make the indexes stable. This will excluded some + // possibilities for optimization, so don't do this quite yet. + exact = true + + b, s, r := t.Raw() + if t.HasString() { + if t.IsPrivateUse() { + // We have no entries for user-defined tags. + return 0, false + } + hasExtra := false + if t.HasVariants() { + if t.HasExtensions() { + build := language.Builder{} + build.SetTag(language.Tag{LangID: b, ScriptID: s, RegionID: r}) + build.AddVariant(t.Variants()) + exact = false + t = build.Make() + } + hasExtra = true + } else if _, ok := t.Extension('u'); ok { + // TODO: va may mean something else. Consider not considering it. + // Strip all but the 'va' entry. + old := t + variant := t.TypeForKey("va") + t = language.Tag{LangID: b, ScriptID: s, RegionID: r} + if variant != "" { + t, _ = t.SetTypeForKey("va", variant) + hasExtra = true + } + exact = old == t + } else { + exact = false + } + if hasExtra { + // We have some variants. + for i, s := range specialTags { + if s == t { + return ID(i + len(coreTags)), exact + } + } + exact = false + } + } + if x, ok := getCoreIndex(t); ok { + return x, exact + } + exact = false + if r != 0 && s == 0 { + // Deal with cases where an extra script is inserted for the region. + t, _ := t.Maximize() + if x, ok := getCoreIndex(t); ok { + return x, exact + } + } + for t = t.Parent(); t != root; t = t.Parent() { + // No variants specified: just compare core components. + // The key has the form lllssrrr, where l, s, and r are nibbles for + // respectively the langID, scriptID, and regionID. + if x, ok := getCoreIndex(t); ok { + return x, exact + } + } + return 0, exact +} + +var root = language.Tag{} |