1// Copyright 2015 The Go Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style 3// license that can be found in the LICENSE file. 4 5// +build ignore 6 7package main 8 9import ( 10 "time" 11 12 "golang.org/x/text/language" 13) 14 15// This file contains code common to gen.go and the package code. 16 17const ( 18 cashShift = 3 19 roundMask = 0x7 20 21 nonTenderBit = 0x8000 22) 23 24// currencyInfo contains information about a currency. 25// bits 0..2: index into roundings for standard rounding 26// bits 3..5: index into roundings for cash rounding 27type currencyInfo byte 28 29// roundingType defines the scale (number of fractional decimals) and increments 30// in terms of units of size 10^-scale. For example, for scale == 2 and 31// increment == 1, the currency is rounded to units of 0.01. 32type roundingType struct { 33 scale, increment uint8 34} 35 36// roundings contains rounding data for currencies. This struct is 37// created by hand as it is very unlikely to change much. 38var roundings = [...]roundingType{ 39 {2, 1}, // default 40 {0, 1}, 41 {1, 1}, 42 {3, 1}, 43 {4, 1}, 44 {2, 5}, // cash rounding alternative 45 {2, 50}, 46} 47 48// regionToCode returns a 16-bit region code. Only two-letter codes are 49// supported. (Three-letter codes are not needed.) 50func regionToCode(r language.Region) uint16 { 51 if s := r.String(); len(s) == 2 { 52 return uint16(s[0])<<8 | uint16(s[1]) 53 } 54 return 0 55} 56 57func toDate(t time.Time) uint32 { 58 y := t.Year() 59 if y == 1 { 60 return 0 61 } 62 date := uint32(y) << 4 63 date |= uint32(t.Month()) 64 date <<= 5 65 date |= uint32(t.Day()) 66 return date 67} 68 69func fromDate(date uint32) time.Time { 70 return time.Date(int(date>>9), time.Month((date>>5)&0xf), int(date&0x1f), 0, 0, 0, 0, time.UTC) 71} 72