71 lines
1.6 KiB
Go
71 lines
1.6 KiB
Go
|
// 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.
|
||
|
|
|
||
|
|
// +build ignore
|
||
|
|
|
||
|
|
package main
|
||
|
|
|
||
|
|
import (
|
||
|
|
"time"
|
||
|
|
|
||
|
|
"golang.org/x/text/language"
|
||
|
|
)
|
||
|
|
|
||
|
|
// This file contains code common to gen.go and the package code.
|
||
|
|
|
||
|
|
const (
|
||
|
|
cashShift = 3
|
||
|
|
roundMask = 0x7
|
||
|
|
|
||
|
|
nonTenderBit = 0x8000
|
||
|
|
)
|
||
|
|
|
||
|
|
// currencyInfo contains information about a currency.
|
||
|
|
// bits 0..2: index into roundings for standard rounding
|
||
|
|
// bits 3..5: index into roundings for cash rounding
|
||
|
|
type currencyInfo byte
|
||
|
|
|
||
|
|
// roundingType defines the scale (number of fractional decimals) and increments
|
||
|
|
// in terms of units of size 10^-scale. For example, for scale == 2 and
|
||
|
|
// increment == 1, the currency is rounded to units of 0.01.
|
||
|
|
type roundingType struct {
|
||
|
|
scale, increment uint8
|
||
|
|
}
|
||
|
|
|
||
|
|
// roundings contains rounding data for currencies. This struct is
|
||
|
|
// created by hand as it is very unlikely to change much.
|
||
|
|
var roundings = [...]roundingType{
|
||
|
|
{2, 1}, // default
|
||
|
|
{0, 1},
|
||
|
|
{1, 1},
|
||
|
|
{3, 1},
|
||
|
|
{4, 1},
|
||
|
|
{2, 5}, // cash rounding alternative
|
||
|
|
}
|
||
|
|
|
||
|
|
// regionToCode returns a 16-bit region code. Only two-letter codes are
|
||
|
|
// supported. (Three-letter codes are not needed.)
|
||
|
|
func regionToCode(r language.Region) uint16 {
|
||
|
|
if s := r.String(); len(s) == 2 {
|
||
|
|
return uint16(s[0])<<8 | uint16(s[1])
|
||
|
|
}
|
||
|
|
return 0
|
||
|
|
}
|
||
|
|
|
||
|
|
func toDate(t time.Time) uint32 {
|
||
|
|
y := t.Year()
|
||
|
|
if y == 1 {
|
||
|
|
return 0
|
||
|
|
}
|
||
|
|
date := uint32(y) << 4
|
||
|
|
date |= uint32(t.Month())
|
||
|
|
date <<= 5
|
||
|
|
date |= uint32(t.Day())
|
||
|
|
return date
|
||
|
|
}
|
||
|
|
|
||
|
|
func fromDate(date uint32) time.Time {
|
||
|
|
return time.Date(int(date>>9), time.Month((date>>5)&0xf), int(date&0x1f), 0, 0, 0, 0, time.UTC)
|
||
|
|
}
|