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-rw-r--r--vendor/golang.org/x/text/internal/number/number.go156
1 files changed, 156 insertions, 0 deletions
diff --git a/vendor/golang.org/x/text/internal/number/number.go b/vendor/golang.org/x/text/internal/number/number.go
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+// Copyright 2016 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
+
+// Package number contains tools and data for formatting numbers.
+package number
+
+import (
+ "unicode/utf8"
+
+ "golang.org/x/text/internal"
+ "golang.org/x/text/language"
+)
+
+// Info holds number formatting configuration data.
+type Info struct {
+ system systemData // numbering system information
+ symIndex symOffset // index to symbols
+}
+
+// InfoFromLangID returns a Info for the given compact language identifier and
+// numbering system identifier. If system is the empty string, the default
+// numbering system will be taken for that language.
+func InfoFromLangID(compactIndex int, numberSystem string) Info {
+ p := langToDefaults[compactIndex]
+ // Lookup the entry for the language.
+ pSymIndex := symOffset(0) // Default: Latin, default symbols
+ system, ok := systemMap[numberSystem]
+ if !ok {
+ // Take the value for the default numbering system. This is by far the
+ // most common case as an alternative numbering system is hardly used.
+ if p&hasNonLatnMask == 0 { // Latn digits.
+ pSymIndex = p
+ } else { // Non-Latn or multiple numbering systems.
+ // Take the first entry from the alternatives list.
+ data := langToAlt[p&^hasNonLatnMask]
+ pSymIndex = data.symIndex
+ system = data.system
+ }
+ } else {
+ langIndex := compactIndex
+ ns := system
+ outerLoop:
+ for ; ; p = langToDefaults[langIndex] {
+ if p&hasNonLatnMask == 0 {
+ if ns == 0 {
+ // The index directly points to the symbol data.
+ pSymIndex = p
+ break
+ }
+ // Move to the parent and retry.
+ langIndex = int(internal.Parent[langIndex])
+ } else {
+ // The index points to a list of symbol data indexes.
+ for _, e := range langToAlt[p&^hasNonLatnMask:] {
+ if int(e.compactTag) != langIndex {
+ if langIndex == 0 {
+ // The CLDR root defines full symbol information for
+ // all numbering systems (even though mostly by
+ // means of aliases). Fall back to the default entry
+ // for Latn if there is no data for the numbering
+ // system of this language.
+ if ns == 0 {
+ break
+ }
+ // Fall back to Latin and start from the original
+ // language. See
+ // http://unicode.org/reports/tr35/#Locale_Inheritance.
+ ns = numLatn
+ langIndex = compactIndex
+ continue outerLoop
+ }
+ // Fall back to parent.
+ langIndex = int(internal.Parent[langIndex])
+ } else if e.system == ns {
+ pSymIndex = e.symIndex
+ break outerLoop
+ }
+ }
+ }
+ }
+ }
+ if int(system) >= len(numSysData) { // algorithmic
+ // Will generate ASCII digits in case the user inadvertently calls
+ // WriteDigit or Digit on it.
+ d := numSysData[0]
+ d.id = system
+ return Info{
+ system: d,
+ symIndex: pSymIndex,
+ }
+ }
+ return Info{
+ system: numSysData[system],
+ symIndex: pSymIndex,
+ }
+}
+
+// InfoFromTag returns a Info for the given language tag.
+func InfoFromTag(t language.Tag) Info {
+ for {
+ if index, ok := language.CompactIndex(t); ok {
+ return InfoFromLangID(index, t.TypeForKey("nu"))
+ }
+ t = t.Parent()
+ }
+}
+
+// IsDecimal reports if the numbering system can convert decimal to native
+// symbols one-to-one.
+func (n Info) IsDecimal() bool {
+ return int(n.system.id) < len(numSysData)
+}
+
+// WriteDigit writes the UTF-8 sequence for n corresponding to the given ASCII
+// digit to dst and reports the number of bytes written. dst must be large
+// enough to hold the rune (can be up to utf8.UTFMax bytes).
+func (n Info) WriteDigit(dst []byte, asciiDigit rune) int {
+ copy(dst, n.system.zero[:n.system.digitSize])
+ dst[n.system.digitSize-1] += byte(asciiDigit - '0')
+ return int(n.system.digitSize)
+}
+
+// AppendDigit appends the UTF-8 sequence for n corresponding to the given digit
+// to dst and reports the number of bytes written. dst must be large enough to
+// hold the rune (can be up to utf8.UTFMax bytes).
+func (n Info) AppendDigit(dst []byte, digit byte) []byte {
+ dst = append(dst, n.system.zero[:n.system.digitSize]...)
+ dst[len(dst)-1] += digit
+ return dst
+}
+
+// Digit returns the digit for the numbering system for the corresponding ASCII
+// value. For example, ni.Digit('3') could return 'δΈ‰'. Note that the argument
+// is the rune constant '3', which equals 51, not the integer constant 3.
+func (n Info) Digit(asciiDigit rune) rune {
+ var x [utf8.UTFMax]byte
+ n.WriteDigit(x[:], asciiDigit)
+ r, _ := utf8.DecodeRune(x[:])
+ return r
+}
+
+// Symbol returns the string for the given symbol type.
+func (n Info) Symbol(t SymbolType) string {
+ return symData.Elem(int(symIndex[n.symIndex][t]))
+}
+
+func formatForLang(t language.Tag, index []byte) *Pattern {
+ for ; ; t = t.Parent() {
+ if x, ok := language.CompactIndex(t); ok {
+ return &formats[index[x]]
+ }
+ }
+}