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// 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)
}