401 lines
10 KiB
Go
401 lines
10 KiB
Go
// Copyright 2015 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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// +build ignore
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// Generator for currency-related data.
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package main
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import (
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"flag"
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"fmt"
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"log"
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"os"
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"sort"
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"strconv"
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"strings"
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"time"
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"golang.org/x/text/internal"
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"golang.org/x/text/internal/gen"
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"golang.org/x/text/internal/tag"
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"golang.org/x/text/language"
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"golang.org/x/text/unicode/cldr"
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)
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var (
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test = flag.Bool("test", false,
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"test existing tables; can be used to compare web data with package data.")
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outputFile = flag.String("output", "tables.go", "output file")
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draft = flag.String("draft",
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"contributed",
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`Minimal draft requirements (approved, contributed, provisional, unconfirmed).`)
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)
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func main() {
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gen.Init()
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gen.Repackage("gen_common.go", "common.go", "currency")
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// Read the CLDR zip file.
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r := gen.OpenCLDRCoreZip()
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defer r.Close()
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d := &cldr.Decoder{}
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d.SetDirFilter("supplemental", "main")
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d.SetSectionFilter("numbers")
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data, err := d.DecodeZip(r)
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if err != nil {
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log.Fatalf("DecodeZip: %v", err)
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}
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w := gen.NewCodeWriter()
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defer w.WriteGoFile(*outputFile, "currency")
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fmt.Fprintln(w, `import "golang.org/x/text/internal/tag"`)
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gen.WriteCLDRVersion(w)
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b := &builder{}
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b.genCurrencies(w, data.Supplemental())
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b.genSymbols(w, data)
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}
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var constants = []string{
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// Undefined and testing.
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"XXX", "XTS",
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// G11 currencies https://en.wikipedia.org/wiki/G10_currencies.
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"USD", "EUR", "JPY", "GBP", "CHF", "AUD", "NZD", "CAD", "SEK", "NOK", "DKK",
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// Precious metals.
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"XAG", "XAU", "XPT", "XPD",
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// Additional common currencies as defined by CLDR.
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"BRL", "CNY", "INR", "RUB", "HKD", "IDR", "KRW", "MXN", "PLN", "SAR",
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"THB", "TRY", "TWD", "ZAR",
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}
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type builder struct {
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currencies tag.Index
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numCurrencies int
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}
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func (b *builder) genCurrencies(w *gen.CodeWriter, data *cldr.SupplementalData) {
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// 3-letter ISO currency codes
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// Start with dummy to let index start at 1.
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currencies := []string{"\x00\x00\x00\x00"}
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// currency codes
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for _, reg := range data.CurrencyData.Region {
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for _, cur := range reg.Currency {
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currencies = append(currencies, cur.Iso4217)
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}
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}
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// Not included in the list for some reasons:
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currencies = append(currencies, "MVP")
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sort.Strings(currencies)
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// Unique the elements.
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k := 0
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for i := 1; i < len(currencies); i++ {
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if currencies[k] != currencies[i] {
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currencies[k+1] = currencies[i]
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k++
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}
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}
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currencies = currencies[:k+1]
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// Close with dummy for simpler and faster searching.
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currencies = append(currencies, "\xff\xff\xff\xff")
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// Write currency values.
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fmt.Fprintln(w, "const (")
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for _, c := range constants {
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index := sort.SearchStrings(currencies, c)
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fmt.Fprintf(w, "\t%s = %d\n", strings.ToLower(c), index)
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}
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fmt.Fprint(w, ")")
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// Compute currency-related data that we merge into the table.
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for _, info := range data.CurrencyData.Fractions[0].Info {
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if info.Iso4217 == "DEFAULT" {
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continue
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}
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standard := getRoundingIndex(info.Digits, info.Rounding, 0)
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cash := getRoundingIndex(info.CashDigits, info.CashRounding, standard)
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index := sort.SearchStrings(currencies, info.Iso4217)
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currencies[index] += mkCurrencyInfo(standard, cash)
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}
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// Set default values for entries that weren't touched.
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for i, c := range currencies {
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if len(c) == 3 {
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currencies[i] += mkCurrencyInfo(0, 0)
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}
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}
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b.currencies = tag.Index(strings.Join(currencies, ""))
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w.WriteComment(`
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currency holds an alphabetically sorted list of canonical 3-letter currency
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identifiers. Each identifier is followed by a byte of type currencyInfo,
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defined in gen_common.go.`)
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w.WriteConst("currency", b.currencies)
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// Hack alert: gofmt indents a trailing comment after an indented string.
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// Ensure that the next thing written is not a comment.
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b.numCurrencies = (len(b.currencies) / 4) - 2
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w.WriteConst("numCurrencies", b.numCurrencies)
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// Create a table that maps regions to currencies.
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regionToCurrency := []toCurrency{}
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for _, reg := range data.CurrencyData.Region {
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if len(reg.Iso3166) != 2 {
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log.Fatalf("Unexpected group %q in region data", reg.Iso3166)
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}
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if len(reg.Currency) == 0 {
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continue
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}
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cur := reg.Currency[0]
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if cur.To != "" || cur.Tender == "false" {
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continue
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}
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regionToCurrency = append(regionToCurrency, toCurrency{
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region: regionToCode(language.MustParseRegion(reg.Iso3166)),
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code: uint16(b.currencies.Index([]byte(cur.Iso4217))),
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})
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}
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sort.Sort(byRegion(regionToCurrency))
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w.WriteType(toCurrency{})
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w.WriteVar("regionToCurrency", regionToCurrency)
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// Create a table that maps regions to currencies.
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regionData := []regionInfo{}
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for _, reg := range data.CurrencyData.Region {
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if len(reg.Iso3166) != 2 {
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log.Fatalf("Unexpected group %q in region data", reg.Iso3166)
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}
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for _, cur := range reg.Currency {
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from, _ := time.Parse("2006-01-02", cur.From)
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to, _ := time.Parse("2006-01-02", cur.To)
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code := uint16(b.currencies.Index([]byte(cur.Iso4217)))
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if cur.Tender == "false" {
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code |= nonTenderBit
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}
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regionData = append(regionData, regionInfo{
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region: regionToCode(language.MustParseRegion(reg.Iso3166)),
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code: code,
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from: toDate(from),
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to: toDate(to),
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})
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}
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}
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sort.Stable(byRegionCode(regionData))
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w.WriteType(regionInfo{})
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w.WriteVar("regionData", regionData)
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}
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type regionInfo struct {
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region uint16
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code uint16 // 0x8000 not legal tender
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from uint32
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to uint32
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}
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type byRegionCode []regionInfo
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func (a byRegionCode) Len() int { return len(a) }
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func (a byRegionCode) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
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func (a byRegionCode) Less(i, j int) bool { return a[i].region < a[j].region }
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type toCurrency struct {
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region uint16
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code uint16
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}
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type byRegion []toCurrency
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func (a byRegion) Len() int { return len(a) }
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func (a byRegion) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
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func (a byRegion) Less(i, j int) bool { return a[i].region < a[j].region }
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func mkCurrencyInfo(standard, cash int) string {
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return string([]byte{byte(cash<<cashShift | standard)})
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}
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func getRoundingIndex(digits, rounding string, defIndex int) int {
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round := roundings[defIndex] // default
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if digits != "" {
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round.scale = parseUint8(digits)
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}
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if rounding != "" && rounding != "0" { // 0 means 1 here in CLDR
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round.increment = parseUint8(rounding)
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}
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// Will panic if the entry doesn't exist:
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for i, r := range roundings {
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if r == round {
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return i
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}
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}
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log.Fatalf("Rounding entry %#v does not exist.", round)
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panic("unreachable")
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}
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// genSymbols generates the symbols used for currencies. Most symbols are
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// defined in root and there is only very small variation per language.
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// The following rules apply:
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// - A symbol can be requested as normal or narrow.
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// - If a symbol is not defined for a currency, it defaults to its ISO code.
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func (b *builder) genSymbols(w *gen.CodeWriter, data *cldr.CLDR) {
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d, err := cldr.ParseDraft(*draft)
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if err != nil {
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log.Fatalf("filter: %v", err)
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}
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const (
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normal = iota
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narrow
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numTypes
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)
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// language -> currency -> type -> symbol
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var symbols [language.NumCompactTags][][numTypes]*string
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// Collect symbol information per language.
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for _, lang := range data.Locales() {
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ldml := data.RawLDML(lang)
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if ldml.Numbers == nil || ldml.Numbers.Currencies == nil {
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continue
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}
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langIndex, ok := language.CompactIndex(language.MustParse(lang))
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if !ok {
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log.Fatalf("No compact index for language %s", lang)
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}
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symbols[langIndex] = make([][numTypes]*string, b.numCurrencies+1)
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for _, c := range ldml.Numbers.Currencies.Currency {
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syms := cldr.MakeSlice(&c.Symbol)
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syms.SelectDraft(d)
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for _, sym := range c.Symbol {
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v := sym.Data()
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if v == c.Type {
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// We define "" to mean the ISO symbol.
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v = ""
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}
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cur := b.currencies.Index([]byte(c.Type))
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// XXX gets reassigned to 0 in the package's code.
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if c.Type == "XXX" {
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cur = 0
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}
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if cur == -1 {
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fmt.Println("Unsupported:", c.Type)
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continue
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}
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switch sym.Alt {
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case "":
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symbols[langIndex][cur][normal] = &v
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case "narrow":
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symbols[langIndex][cur][narrow] = &v
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}
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}
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}
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}
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// Remove values identical to the parent.
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for langIndex, data := range symbols {
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for curIndex, curs := range data {
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for typ, sym := range curs {
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if sym == nil {
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continue
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}
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for p := uint16(langIndex); p != 0; {
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p = internal.Parent[p]
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x := symbols[p]
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if x == nil {
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continue
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}
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if v := x[curIndex][typ]; v != nil || p == 0 {
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// Value is equal to the default value root value is undefined.
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parentSym := ""
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if v != nil {
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parentSym = *v
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}
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if parentSym == *sym {
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// Value is the same as parent.
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data[curIndex][typ] = nil
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}
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break
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}
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}
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}
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}
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}
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// Create symbol index.
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symbolData := []byte{0}
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symbolLookup := map[string]uint16{"": 0} // 0 means default, so block that value.
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for _, data := range symbols {
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for _, curs := range data {
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for _, sym := range curs {
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if sym == nil {
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continue
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}
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if _, ok := symbolLookup[*sym]; !ok {
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symbolLookup[*sym] = uint16(len(symbolData))
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symbolData = append(symbolData, byte(len(*sym)))
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symbolData = append(symbolData, *sym...)
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}
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}
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}
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}
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w.WriteComment(`
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symbols holds symbol data of the form <n> <str>, where n is the length of
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the symbol string str.`)
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w.WriteConst("symbols", string(symbolData))
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// Create index from language to currency lookup to symbol.
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type curToIndex struct{ cur, idx uint16 }
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w.WriteType(curToIndex{})
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prefix := []string{"normal", "narrow"}
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// Create data for regular and narrow symbol data.
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for typ := normal; typ <= narrow; typ++ {
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indexes := []curToIndex{} // maps currency to symbol index
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languages := []uint16{}
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for _, data := range symbols {
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languages = append(languages, uint16(len(indexes)))
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for curIndex, curs := range data {
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if sym := curs[typ]; sym != nil {
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indexes = append(indexes, curToIndex{uint16(curIndex), symbolLookup[*sym]})
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}
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}
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}
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languages = append(languages, uint16(len(indexes)))
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w.WriteVar(prefix[typ]+"LangIndex", languages)
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w.WriteVar(prefix[typ]+"SymIndex", indexes)
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}
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}
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func parseUint8(str string) uint8 {
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x, err := strconv.ParseUint(str, 10, 8)
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if err != nil {
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// Show line number of where this function was called.
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log.New(os.Stderr, "", log.Lshortfile).Output(2, err.Error())
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os.Exit(1)
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}
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return uint8(x)
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}
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