diff options
Diffstat (limited to 'vendor/golang.org/x/text/internal/language/match.go')
-rw-r--r-- | vendor/golang.org/x/text/internal/language/match.go | 226 |
1 files changed, 0 insertions, 226 deletions
diff --git a/vendor/golang.org/x/text/internal/language/match.go b/vendor/golang.org/x/text/internal/language/match.go deleted file mode 100644 index 75a2dbc..0000000 --- a/vendor/golang.org/x/text/internal/language/match.go +++ /dev/null @@ -1,226 +0,0 @@ -// 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. - -package language - -import "errors" - -type scriptRegionFlags uint8 - -const ( - isList = 1 << iota - scriptInFrom - regionInFrom -) - -func (t *Tag) setUndefinedLang(id Language) { - if t.LangID == 0 { - t.LangID = id - } -} - -func (t *Tag) setUndefinedScript(id Script) { - if t.ScriptID == 0 { - t.ScriptID = id - } -} - -func (t *Tag) setUndefinedRegion(id Region) { - if t.RegionID == 0 || t.RegionID.Contains(id) { - t.RegionID = id - } -} - -// ErrMissingLikelyTagsData indicates no information was available -// to compute likely values of missing tags. -var ErrMissingLikelyTagsData = errors.New("missing likely tags data") - -// addLikelySubtags sets subtags to their most likely value, given the locale. -// In most cases this means setting fields for unknown values, but in some -// cases it may alter a value. It returns an ErrMissingLikelyTagsData error -// if the given locale cannot be expanded. -func (t Tag) addLikelySubtags() (Tag, error) { - id, err := addTags(t) - if err != nil { - return t, err - } else if id.equalTags(t) { - return t, nil - } - id.RemakeString() - return id, nil -} - -// specializeRegion attempts to specialize a group region. -func specializeRegion(t *Tag) bool { - if i := regionInclusion[t.RegionID]; i < nRegionGroups { - x := likelyRegionGroup[i] - if Language(x.lang) == t.LangID && Script(x.script) == t.ScriptID { - t.RegionID = Region(x.region) - } - return true - } - return false -} - -// Maximize returns a new tag with missing tags filled in. -func (t Tag) Maximize() (Tag, error) { - return addTags(t) -} - -func addTags(t Tag) (Tag, error) { - // We leave private use identifiers alone. - if t.IsPrivateUse() { - return t, nil - } - if t.ScriptID != 0 && t.RegionID != 0 { - if t.LangID != 0 { - // already fully specified - specializeRegion(&t) - return t, nil - } - // Search matches for und-script-region. Note that for these cases - // region will never be a group so there is no need to check for this. - list := likelyRegion[t.RegionID : t.RegionID+1] - if x := list[0]; x.flags&isList != 0 { - list = likelyRegionList[x.lang : x.lang+uint16(x.script)] - } - for _, x := range list { - // Deviating from the spec. See match_test.go for details. - if Script(x.script) == t.ScriptID { - t.setUndefinedLang(Language(x.lang)) - return t, nil - } - } - } - if t.LangID != 0 { - // Search matches for lang-script and lang-region, where lang != und. - if t.LangID < langNoIndexOffset { - x := likelyLang[t.LangID] - if x.flags&isList != 0 { - list := likelyLangList[x.region : x.region+uint16(x.script)] - if t.ScriptID != 0 { - for _, x := range list { - if Script(x.script) == t.ScriptID && x.flags&scriptInFrom != 0 { - t.setUndefinedRegion(Region(x.region)) - return t, nil - } - } - } else if t.RegionID != 0 { - count := 0 - goodScript := true - tt := t - for _, x := range list { - // We visit all entries for which the script was not - // defined, including the ones where the region was not - // defined. This allows for proper disambiguation within - // regions. - if x.flags&scriptInFrom == 0 && t.RegionID.Contains(Region(x.region)) { - tt.RegionID = Region(x.region) - tt.setUndefinedScript(Script(x.script)) - goodScript = goodScript && tt.ScriptID == Script(x.script) - count++ - } - } - if count == 1 { - return tt, nil - } - // Even if we fail to find a unique Region, we might have - // an unambiguous script. - if goodScript { - t.ScriptID = tt.ScriptID - } - } - } - } - } else { - // Search matches for und-script. - if t.ScriptID != 0 { - x := likelyScript[t.ScriptID] - if x.region != 0 { - t.setUndefinedRegion(Region(x.region)) - t.setUndefinedLang(Language(x.lang)) - return t, nil - } - } - // Search matches for und-region. If und-script-region exists, it would - // have been found earlier. - if t.RegionID != 0 { - if i := regionInclusion[t.RegionID]; i < nRegionGroups { - x := likelyRegionGroup[i] - if x.region != 0 { - t.setUndefinedLang(Language(x.lang)) - t.setUndefinedScript(Script(x.script)) - t.RegionID = Region(x.region) - } - } else { - x := likelyRegion[t.RegionID] - if x.flags&isList != 0 { - x = likelyRegionList[x.lang] - } - if x.script != 0 && x.flags != scriptInFrom { - t.setUndefinedLang(Language(x.lang)) - t.setUndefinedScript(Script(x.script)) - return t, nil - } - } - } - } - - // Search matches for lang. - if t.LangID < langNoIndexOffset { - x := likelyLang[t.LangID] - if x.flags&isList != 0 { - x = likelyLangList[x.region] - } - if x.region != 0 { - t.setUndefinedScript(Script(x.script)) - t.setUndefinedRegion(Region(x.region)) - } - specializeRegion(&t) - if t.LangID == 0 { - t.LangID = _en // default language - } - return t, nil - } - return t, ErrMissingLikelyTagsData -} - -func (t *Tag) setTagsFrom(id Tag) { - t.LangID = id.LangID - t.ScriptID = id.ScriptID - t.RegionID = id.RegionID -} - -// minimize removes the region or script subtags from t such that -// t.addLikelySubtags() == t.minimize().addLikelySubtags(). -func (t Tag) minimize() (Tag, error) { - t, err := minimizeTags(t) - if err != nil { - return t, err - } - t.RemakeString() - return t, nil -} - -// minimizeTags mimics the behavior of the ICU 51 C implementation. -func minimizeTags(t Tag) (Tag, error) { - if t.equalTags(Und) { - return t, nil - } - max, err := addTags(t) - if err != nil { - return t, err - } - for _, id := range [...]Tag{ - {LangID: t.LangID}, - {LangID: t.LangID, RegionID: t.RegionID}, - {LangID: t.LangID, ScriptID: t.ScriptID}, - } { - if x, err := addTags(id); err == nil && max.equalTags(x) { - t.setTagsFrom(id) - break - } - } - return t, nil -} |