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author | uzhas <uzhas@ydb.tech> | 2023-11-16 16:04:50 +0300 |
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committer | uzhas <uzhas@ydb.tech> | 2023-11-16 17:46:46 +0300 |
commit | 46f0c0079bb50609d2eeb6586642bcf114fc5239 (patch) | |
tree | 84e4e4978d57fe5de321ba69bf9d0c290de60a66 /vendor/golang.org/x/text/feature/plural/message.go | |
parent | 73045e389397816cc2bdd6cd7818b4bce427b265 (diff) | |
download | ydb-46f0c0079bb50609d2eeb6586642bcf114fc5239.tar.gz |
enable ya make for go projects
Diffstat (limited to 'vendor/golang.org/x/text/feature/plural/message.go')
-rw-r--r-- | vendor/golang.org/x/text/feature/plural/message.go | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/vendor/golang.org/x/text/feature/plural/message.go b/vendor/golang.org/x/text/feature/plural/message.go new file mode 100644 index 0000000000..56d518cc34 --- /dev/null +++ b/vendor/golang.org/x/text/feature/plural/message.go @@ -0,0 +1,244 @@ +// Copyright 2017 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 plural + +import ( + "fmt" + "io" + "reflect" + "strconv" + + "golang.org/x/text/internal/catmsg" + "golang.org/x/text/internal/number" + "golang.org/x/text/language" + "golang.org/x/text/message/catalog" +) + +// TODO: consider deleting this interface. Maybe VisibleDigits is always +// sufficient and practical. + +// Interface is used for types that can determine their own plural form. +type Interface interface { + // PluralForm reports the plural form for the given language of the + // underlying value. It also returns the integer value. If the integer value + // is larger than fits in n, PluralForm may return a value modulo + // 10,000,000. + PluralForm(t language.Tag, scale int) (f Form, n int) +} + +// Selectf returns the first case for which its selector is a match for the +// arg-th substitution argument to a formatting call, formatting it as indicated +// by format. +// +// The cases argument are pairs of selectors and messages. Selectors are of type +// string or Form. Messages are of type string or catalog.Message. A selector +// matches an argument if: +// - it is "other" or Other +// - it matches the plural form of the argument: "zero", "one", "two", "few", +// or "many", or the equivalent Form +// - it is of the form "=x" where x is an integer that matches the value of +// the argument. +// - it is of the form "<x" where x is an integer that is larger than the +// argument. +// +// The format argument determines the formatting parameters for which to +// determine the plural form. This is especially relevant for non-integer +// values. +// +// The format string may be "", in which case a best-effort attempt is made to +// find a reasonable representation on which to base the plural form. Examples +// of format strings are: +// - %.2f decimal with scale 2 +// - %.2e scientific notation with precision 3 (scale + 1) +// - %d integer +func Selectf(arg int, format string, cases ...interface{}) catalog.Message { + var p parser + // Intercept the formatting parameters of format by doing a dummy print. + fmt.Fprintf(io.Discard, format, &p) + m := &message{arg, kindDefault, 0, cases} + switch p.verb { + case 'g': + m.kind = kindPrecision + m.scale = p.scale + case 'f': + m.kind = kindScale + m.scale = p.scale + case 'e': + m.kind = kindScientific + m.scale = p.scale + case 'd': + m.kind = kindScale + m.scale = 0 + default: + // TODO: do we need to handle errors? + } + return m +} + +type parser struct { + verb rune + scale int +} + +func (p *parser) Format(s fmt.State, verb rune) { + p.verb = verb + p.scale = -1 + if prec, ok := s.Precision(); ok { + p.scale = prec + } +} + +type message struct { + arg int + kind int + scale int + cases []interface{} +} + +const ( + // Start with non-ASCII to allow skipping values. + kindDefault = 0x80 + iota + kindScale // verb f, number of fraction digits follows + kindScientific // verb e, number of fraction digits follows + kindPrecision // verb g, number of significant digits follows +) + +var handle = catmsg.Register("golang.org/x/text/feature/plural:plural", execute) + +func (m *message) Compile(e *catmsg.Encoder) error { + e.EncodeMessageType(handle) + + e.EncodeUint(uint64(m.arg)) + + e.EncodeUint(uint64(m.kind)) + if m.kind > kindDefault { + e.EncodeUint(uint64(m.scale)) + } + + forms := validForms(cardinal, e.Language()) + + for i := 0; i < len(m.cases); { + if err := compileSelector(e, forms, m.cases[i]); err != nil { + return err + } + if i++; i >= len(m.cases) { + return fmt.Errorf("plural: no message defined for selector %v", m.cases[i-1]) + } + var msg catalog.Message + switch x := m.cases[i].(type) { + case string: + msg = catalog.String(x) + case catalog.Message: + msg = x + default: + return fmt.Errorf("plural: message of type %T; must be string or catalog.Message", x) + } + if err := e.EncodeMessage(msg); err != nil { + return err + } + i++ + } + return nil +} + +func compileSelector(e *catmsg.Encoder, valid []Form, selector interface{}) error { + form := Other + switch x := selector.(type) { + case string: + if x == "" { + return fmt.Errorf("plural: empty selector") + } + if c := x[0]; c == '=' || c == '<' { + val, err := strconv.ParseUint(x[1:], 10, 16) + if err != nil { + return fmt.Errorf("plural: invalid number in selector %q: %v", selector, err) + } + e.EncodeUint(uint64(c)) + e.EncodeUint(val) + return nil + } + var ok bool + form, ok = countMap[x] + if !ok { + return fmt.Errorf("plural: invalid plural form %q", selector) + } + case Form: + form = x + default: + return fmt.Errorf("plural: selector of type %T; want string or Form", selector) + } + + ok := false + for _, f := range valid { + if f == form { + ok = true + break + } + } + if !ok { + return fmt.Errorf("plural: form %q not supported for language %q", selector, e.Language()) + } + e.EncodeUint(uint64(form)) + return nil +} + +func execute(d *catmsg.Decoder) bool { + lang := d.Language() + argN := int(d.DecodeUint()) + kind := int(d.DecodeUint()) + scale := -1 // default + if kind > kindDefault { + scale = int(d.DecodeUint()) + } + form := Other + n := -1 + if arg := d.Arg(argN); arg == nil { + // Default to Other. + } else if x, ok := arg.(number.VisibleDigits); ok { + d := x.Digits(nil, lang, scale) + form, n = cardinal.matchDisplayDigits(lang, &d) + } else if x, ok := arg.(Interface); ok { + // This covers lists and formatters from the number package. + form, n = x.PluralForm(lang, scale) + } else { + var f number.Formatter + switch kind { + case kindScale: + f.InitDecimal(lang) + f.SetScale(scale) + case kindScientific: + f.InitScientific(lang) + f.SetScale(scale) + case kindPrecision: + f.InitDecimal(lang) + f.SetPrecision(scale) + case kindDefault: + // sensible default + f.InitDecimal(lang) + if k := reflect.TypeOf(arg).Kind(); reflect.Int <= k && k <= reflect.Uintptr { + f.SetScale(0) + } else { + f.SetScale(2) + } + } + var dec number.Decimal // TODO: buffer in Printer + dec.Convert(f.RoundingContext, arg) + v := number.FormatDigits(&dec, f.RoundingContext) + if !v.NaN && !v.Inf { + form, n = cardinal.matchDisplayDigits(d.Language(), &v) + } + } + for !d.Done() { + f := d.DecodeUint() + if (f == '=' && n == int(d.DecodeUint())) || + (f == '<' && 0 <= n && n < int(d.DecodeUint())) || + form == Form(f) || + Other == Form(f) { + return d.ExecuteMessage() + } + d.SkipMessage() + } + return false +} |