mirror of
https://github.com/ceph/ceph-csi.git
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153 lines
3.4 KiB
Go
153 lines
3.4 KiB
Go
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// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package currency
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import (
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"sort"
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"time"
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"golang.org/x/text/language"
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)
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// QueryIter represents a set of Units. The default set includes all Units that
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// are currently in use as legal tender in any Region.
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type QueryIter interface {
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// Next returns true if there is a next element available.
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// It must be called before any of the other methods are called.
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Next() bool
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// Unit returns the unit of the current iteration.
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Unit() Unit
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// Region returns the Region for the current iteration.
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Region() language.Region
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// From returns the date from which the unit was used in the region.
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// It returns false if this date is unknown.
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From() (time.Time, bool)
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// To returns the date up till which the unit was used in the region.
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// It returns false if this date is unknown or if the unit is still in use.
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To() (time.Time, bool)
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// IsTender reports whether the unit is a legal tender in the region during
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// the specified date range.
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IsTender() bool
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}
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// Query represents a set of Units. The default set includes all Units that are
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// currently in use as legal tender in any Region.
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func Query(options ...QueryOption) QueryIter {
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it := &iter{
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end: len(regionData),
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date: 0xFFFFFFFF,
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}
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for _, fn := range options {
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fn(it)
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}
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return it
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}
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// NonTender returns a new query that also includes matching Units that are not
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// legal tender.
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var NonTender QueryOption = nonTender
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func nonTender(i *iter) {
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i.nonTender = true
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}
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// Historical selects the units for all dates.
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var Historical QueryOption = historical
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func historical(i *iter) {
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i.date = hist
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}
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// A QueryOption can be used to change the set of unit information returned by
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// a query.
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type QueryOption func(*iter)
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// Date queries the units that were in use at the given point in history.
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func Date(t time.Time) QueryOption {
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d := toDate(t)
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return func(i *iter) {
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i.date = d
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}
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}
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// Region limits the query to only return entries for the given region.
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func Region(r language.Region) QueryOption {
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p, end := len(regionData), len(regionData)
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x := regionToCode(r)
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i := sort.Search(len(regionData), func(i int) bool {
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return regionData[i].region >= x
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})
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if i < len(regionData) && regionData[i].region == x {
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p = i
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for i++; i < len(regionData) && regionData[i].region == x; i++ {
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}
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end = i
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}
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return func(i *iter) {
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i.p, i.end = p, end
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}
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}
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const (
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hist = 0x00
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now = 0xFFFFFFFF
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)
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type iter struct {
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*regionInfo
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p, end int
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date uint32
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nonTender bool
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}
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func (i *iter) Next() bool {
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for ; i.p < i.end; i.p++ {
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i.regionInfo = ®ionData[i.p]
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if !i.nonTender && !i.IsTender() {
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continue
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}
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if i.date == hist || (i.from <= i.date && (i.to == 0 || i.date <= i.to)) {
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i.p++
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return true
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}
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}
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return false
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}
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func (r *regionInfo) Region() language.Region {
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// TODO: this could be much faster.
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var buf [2]byte
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buf[0] = uint8(r.region >> 8)
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buf[1] = uint8(r.region)
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return language.MustParseRegion(string(buf[:]))
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}
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func (r *regionInfo) Unit() Unit {
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return Unit{r.code &^ nonTenderBit}
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}
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func (r *regionInfo) IsTender() bool {
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return r.code&nonTenderBit == 0
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}
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func (r *regionInfo) From() (time.Time, bool) {
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if r.from == 0 {
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return time.Time{}, false
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}
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return fromDate(r.from), true
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}
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func (r *regionInfo) To() (time.Time, bool) {
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if r.to == 0 {
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return time.Time{}, false
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}
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return fromDate(r.to), true
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}
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