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100 lines
3.5 KiB
Go
100 lines
3.5 KiB
Go
// Copyright 2017 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package message implements formatted I/O for localized strings with functions
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// analogous to the fmt's print functions. It is a drop-in replacement for fmt.
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//
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//
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// Localized Formatting
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//
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// A format string can be localized by replacing any of the print functions of
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// fmt with an equivalent call to a Printer.
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//
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// p := message.NewPrinter(language.English)
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// p.Println(123456.78) // Prints 123,456.78
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//
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// p.Printf("%d ducks in a row", 4331) // Prints 4,331 ducks in a row
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//
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// p := message.NewPrinter(language.Dutch)
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// p.Println("Hoogte: %f meter", 1244.9) // Prints Hoogte: 1.244,9 meter
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//
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// p := message.NewPrinter(language.Bengali)
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// p.Println(123456.78) // Prints ১,২৩,৪৫৬.৭৮
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//
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// Printer currently supports numbers and specialized types for which packages
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// exist in x/text. Other builtin types such as time.Time and slices are
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// planned.
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//
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// Format strings largely have the same meaning as with fmt with the following
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// notable exceptions:
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// - flag # always resorts to fmt for printing
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// - verb 'f', 'e', 'g', 'd' use localized formatting unless the '#' flag is
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// specified.
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//
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// See package fmt for more options.
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//
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//
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// Translation
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//
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// The format strings that are passed to Printf, Sprintf, Fprintf, or Errorf
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// are used as keys to look up translations for the specified languages.
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// More on how these need to be specified below.
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//
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// One can use arbitrary keys to distinguish between otherwise ambiguous
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// strings:
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// p := message.NewPrinter(language.English)
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// p.Printf("archive(noun)") // Prints "archive"
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// p.Printf("archive(verb)") // Prints "archive"
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//
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// p := message.NewPrinter(language.German)
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// p.Printf("archive(noun)") // Prints "Archiv"
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// p.Printf("archive(verb)") // Prints "archivieren"
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//
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// To retain the fallback functionality, use Key:
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// p.Printf(message.Key("archive(noun)", "archive"))
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// p.Printf(message.Key("archive(verb)", "archive"))
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//
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//
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// Translation Pipeline
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//
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// Format strings that contain text need to be translated to support different
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// locales. The first step is to extract strings that need to be translated.
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//
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// 1. Install gotext
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// go get -u golang.org/x/text/cmd/gotext
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// gotext -help
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//
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// 2. Mark strings in your source to be translated by using message.Printer,
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// instead of the functions of the fmt package.
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//
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// 3. Extract the strings from your source
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//
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// gotext extract
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//
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// The output will be written to the textdata directory.
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//
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// 4. Send the files for translation
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//
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// It is planned to support multiple formats, but for now one will have to
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// rewrite the JSON output to the desired format.
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//
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// 5. Inject translations into program
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//
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// 6. Repeat from 2
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//
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// Right now this has to be done programmatically with calls to Set or
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// SetString. These functions as well as the methods defined in
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// see also package golang.org/x/text/message/catalog can be used to implement
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// either dynamic or static loading of messages.
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//
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//
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// Plural and Gender Forms
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//
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// Translated messages can vary based on the plural and gender forms of
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// substitution values. In general, it is up to the translators to provide
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// alternative translations for such forms. See the packages in
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// golang.org/x/text/feature and golang.org/x/text/message/catalog for more
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// information.
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//
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package message
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