common.go

Documentation: golang.org/x/text/currency

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