/usr/share/gocode/src/golang.org/x/text/currency/format.go is in golang-golang-x-text-dev 0.0~git20170627.0.6353ef0-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 | // Copyright 2015 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 currency
import (
"fmt"
"io"
"sort"
"golang.org/x/text/internal"
"golang.org/x/text/internal/format"
"golang.org/x/text/language"
)
// Amount is an amount-currency unit pair.
type Amount struct {
amount interface{} // Change to decimal(64|128).
currency Unit
}
// Currency reports the currency unit of this amount.
func (a Amount) Currency() Unit { return a.currency }
// TODO: based on decimal type, but may make sense to customize a bit.
// func (a Amount) Decimal()
// func (a Amount) Int() (int64, error)
// func (a Amount) Fraction() (int64, error)
// func (a Amount) Rat() *big.Rat
// func (a Amount) Float() (float64, error)
// func (a Amount) Scale() uint
// func (a Amount) Precision() uint
// func (a Amount) Sign() int
//
// Add/Sub/Div/Mul/Round.
var space = []byte(" ")
// Format implements fmt.Formatter. It accepts format.State for
// language-specific rendering.
func (a Amount) Format(s fmt.State, verb rune) {
v := formattedValue{
currency: a.currency,
amount: a.amount,
format: defaultFormat,
}
v.Format(s, verb)
}
// formattedValue is currency amount or unit that implements language-sensitive
// formatting.
type formattedValue struct {
currency Unit
amount interface{} // Amount, Unit, or number.
format *options
}
// Format implements fmt.Formatter. It accepts format.State for
// language-specific rendering.
func (v formattedValue) Format(s fmt.State, verb rune) {
var lang int
if state, ok := s.(format.State); ok {
lang, _ = language.CompactIndex(state.Language())
}
// Get the options. Use DefaultFormat if not present.
opt := v.format
if opt == nil {
opt = defaultFormat
}
cur := v.currency
if cur.index == 0 {
cur = opt.currency
}
// TODO: use pattern.
io.WriteString(s, opt.symbol(lang, cur))
if v.amount != nil {
s.Write(space)
// TODO: apply currency-specific rounding
scale, _ := opt.kind.Rounding(cur)
if _, ok := s.Precision(); !ok {
fmt.Fprintf(s, "%.*f", scale, v.amount)
} else {
fmt.Fprint(s, v.amount)
}
}
}
// Formatter decorates a given number, Unit or Amount with formatting options.
type Formatter func(amount interface{}) formattedValue
// func (f Formatter) Options(opts ...Option) Formatter
// TODO: call this a Formatter or FormatFunc?
var dummy = USD.Amount(0)
// adjust creates a new Formatter based on the adjustments of fn on f.
func (f Formatter) adjust(fn func(*options)) Formatter {
var o options = *(f(dummy).format)
fn(&o)
return o.format
}
// Default creates a new Formatter that defaults to currency unit c if a numeric
// value is passed that is not associated with a currency.
func (f Formatter) Default(currency Unit) Formatter {
return f.adjust(func(o *options) { o.currency = currency })
}
// Kind sets the kind of the underlying currency unit.
func (f Formatter) Kind(k Kind) Formatter {
return f.adjust(func(o *options) { o.kind = k })
}
var defaultFormat *options = ISO(dummy).format
var (
// Uses Narrow symbols. Overrides Symbol, if present.
NarrowSymbol Formatter = Formatter(formNarrow)
// Use Symbols instead of ISO codes, when available.
Symbol Formatter = Formatter(formSymbol)
// Use ISO code as symbol.
ISO Formatter = Formatter(formISO)
// TODO:
// // Use full name as symbol.
// Name Formatter
)
// options configures rendering and rounding options for an Amount.
type options struct {
currency Unit
kind Kind
symbol func(compactIndex int, c Unit) string
}
func (o *options) format(amount interface{}) formattedValue {
v := formattedValue{format: o}
switch x := amount.(type) {
case Amount:
v.amount = x.amount
v.currency = x.currency
case *Amount:
v.amount = x.amount
v.currency = x.currency
case Unit:
v.currency = x
case *Unit:
v.currency = *x
default:
if o.currency.index == 0 {
panic("cannot format number without a currency being set")
}
// TODO: Must be a number.
v.amount = x
v.currency = o.currency
}
return v
}
var (
optISO = options{symbol: lookupISO}
optSymbol = options{symbol: lookupSymbol}
optNarrow = options{symbol: lookupNarrow}
)
// These need to be functions, rather than curried methods, as curried methods
// are evaluated at init time, causing tables to be included unconditionally.
func formISO(x interface{}) formattedValue { return optISO.format(x) }
func formSymbol(x interface{}) formattedValue { return optSymbol.format(x) }
func formNarrow(x interface{}) formattedValue { return optNarrow.format(x) }
func lookupISO(x int, c Unit) string { return c.String() }
func lookupSymbol(x int, c Unit) string { return normalSymbol.lookup(x, c) }
func lookupNarrow(x int, c Unit) string { return narrowSymbol.lookup(x, c) }
type symbolIndex struct {
index []uint16 // position corresponds with compact index of language.
data []curToIndex
}
var (
normalSymbol = symbolIndex{normalLangIndex, normalSymIndex}
narrowSymbol = symbolIndex{narrowLangIndex, narrowSymIndex}
)
func (x *symbolIndex) lookup(lang int, c Unit) string {
for {
index := x.data[x.index[lang]:x.index[lang+1]]
i := sort.Search(len(index), func(i int) bool {
return index[i].cur >= c.index
})
if i < len(index) && index[i].cur == c.index {
x := index[i].idx
start := x + 1
end := start + uint16(symbols[x])
if start == end {
return c.String()
}
return symbols[start:end]
}
if lang == 0 {
break
}
lang = int(internal.Parent[lang])
}
return c.String()
}
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