gen_common.go

Documentation: golang.org/x/text/currency

     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  //go:build ignore
     6  
     7  package main
     8  
     9  import (
    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  
    17  const (
    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
    27  type 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.
    32  type 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.
    38  var 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.)
    50  func 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  
    57  func 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  
    69  func 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
View as plain text