Checking in vendor folder for ease of using go get.

vendor/golang.org/x/text/number/format.go

@@ -0,0 +1,122 @@
+// 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 number
+
+import (
+	"fmt"
+	"strings"
+
+	"golang.org/x/text/feature/plural"
+	"golang.org/x/text/internal/format"
+	"golang.org/x/text/internal/number"
+	"golang.org/x/text/language"
+)
+
+// A FormatFunc formates a number.
+type FormatFunc func(x interface{}, opts ...Option) Formatter
+
+// NewFormat creates a FormatFunc based on another FormatFunc and new options.
+// Use NewFormat to cash the creation of formatters.
+func NewFormat(format FormatFunc, opts ...Option) FormatFunc {
+	o := *format(nil).options
+	n := len(o.options)
+	o.options = append(o.options[:n:n], opts...)
+	return func(x interface{}, opts ...Option) Formatter {
+		return newFormatter(&o, opts, x)
+	}
+}
+
+type options struct {
+	verbs      string
+	initFunc   initFunc
+	options    []Option
+	pluralFunc func(t language.Tag, scale int) (f plural.Form, n int)
+}
+
+type optionFlag uint16
+
+const (
+	hasScale optionFlag = 1 << iota
+	hasPrecision
+	noSeparator
+	exact
+)
+
+type initFunc func(f *number.Formatter, t language.Tag)
+
+func newFormatter(o *options, opts []Option, value interface{}) Formatter {
+	if len(opts) > 0 {
+		n := *o
+		n.options = opts
+		o = &n
+	}
+	return Formatter{o, value}
+}
+
+func newOptions(verbs string, f initFunc) *options {
+	return &options{verbs: verbs, initFunc: f}
+}
+
+type Formatter struct {
+	*options
+	value interface{}
+}
+
+// Format implements format.Formatter. It is for internal use only for now.
+func (f Formatter) Format(state format.State, verb rune) {
+	// TODO: consider implementing fmt.Formatter instead and using the following
+	// piece of code. This allows numbers to be rendered mostly as expected
+	// when using fmt. But it may get weird with the spellout options and we
+	// may need more of format.State over time.
+	// lang := language.Und
+	// if s, ok := state.(format.State); ok {
+	// 	lang = s.Language()
+	// }
+
+	lang := state.Language()
+	if !strings.Contains(f.verbs, string(verb)) {
+		fmt.Fprintf(state, "%%!%s(%T=%v)", string(verb), f.value, f.value)
+		return
+	}
+	var p number.Formatter
+	f.initFunc(&p, lang)
+	for _, o := range f.options.options {
+		o(lang, &p)
+	}
+	if w, ok := state.Width(); ok {
+		p.FormatWidth = uint16(w)
+	}
+	if prec, ok := state.Precision(); ok {
+		switch verb {
+		case 'd':
+			p.SetScale(0)
+		case 'f':
+			p.SetScale(prec)
+		case 'e':
+			p.SetPrecision(prec + 1)
+		case 'g':
+			p.SetPrecision(prec)
+		}
+	}
+	var d number.Decimal
+	d.Convert(p.RoundingContext, f.value)
+	state.Write(p.Format(nil, &d))
+}
+
+// Digits returns information about which logical digits will be presented to
+// the user. This information is relevant, for instance, to determine plural
+// forms.
+func (f Formatter) Digits(buf []byte, tag language.Tag, scale int) number.Digits {
+	var p number.Formatter
+	f.initFunc(&p, tag)
+	if scale >= 0 {
+		// TODO: this only works well for decimal numbers, which is generally
+		// fine.
+		p.SetScale(scale)
+	}
+	var d number.Decimal
+	d.Convert(p.RoundingContext, f.value)
+	return number.FormatDigits(&d, p.RoundingContext)
+}