vendor/golang.org/x/text/internal/language/language.go

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// 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_common.go -output tables.go

package language // import "golang.org/x/text/internal/language"

// TODO: Remove above NOTE after:
// - verifying that tables are dropped correctly (most notably matcher tables).

import (
	"errors"
	"fmt"
	"strings"
)

const (
	// maxCoreSize is the maximum size of a BCP 47 tag without variants and
	// extensions. Equals max lang (3) + script (4) + max reg (3) + 2 dashes.
	maxCoreSize = 12

	// max99thPercentileSize is a somewhat arbitrary buffer size that presumably
	// is large enough to hold at least 99% of the BCP 47 tags.
	max99thPercentileSize = 32

	// maxSimpleUExtensionSize is the maximum size of a -u extension with one
	// key-type pair. Equals len("-u-") + key (2) + dash + max value (8).
	maxSimpleUExtensionSize = 14
)

// 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. The zero value of Tag is Und.
type Tag struct {
	// TODO: the following fields have the form TagTypeID. This name is chosen
	// to allow refactoring the public package without conflicting with its
	// Base, Script, and Region methods. Once the transition is fully completed
	// the ID can be stripped from the name.

	LangID   Language
	RegionID Region
	// TODO: we will soon run out of positions for ScriptID. Idea: instead of
	// storing lang, region, and ScriptID codes, store only the compact index and
	// have a lookup table from this code to its expansion. This greatly speeds
	// up table lookup, speed up common variant cases.
	// This will also immediately free up 3 extra bytes. Also, the pVariant
	// field can now be moved to the lookup table, as the compact index uniquely
	// determines the offset of a possible variant.
	ScriptID Script
	pVariant byte   // offset in str, includes preceding '-'
	pExt     uint16 // offset of first extension, includes preceding '-'

	// str is the string representation of the Tag. It will only be used if the
	// tag has variants or extensions.
	str string
}

// Make is a convenience wrapper for Parse that omits the error.
// In case of an error, a sensible default is returned.