func ExampleSlice() {
var dr *cldr.CLDR // assume this is initalized
x, _ := dr.LDML("en")
cs := x.Collations.Collation
// remove all but the default
cldr.MakeSlice(&cs).Filter(func(e cldr.Elem) bool {
return e.GetCommon().Type != x.Collations.Default()
})
for i, c := range cs {
fmt.Println(i, c.Type)
}
}
// genSymbols generates the symbols used for currencies. Most symbols are
// defined in root and there is only very small variation per language.
// The following rules apply:
// - A symbol can be requested as normal or narrow.
// - If a symbol is not defined for a currency, it defaults to its ISO code.
func (b *builder) genSymbols(w *gen.CodeWriter, data *cldr.CLDR) {
d, err := cldr.ParseDraft(*draft)
if err != nil {
log.Fatalf("filter: %v", err)
}
const (
normal = iota
narrow
numTypes
)
// language -> currency -> type -> symbol
var symbols [language.NumCompactTags][][numTypes]*string
// Collect symbol information per language.
for _, lang := range data.Locales() {
ldml := data.RawLDML(lang)
if ldml.Numbers == nil || ldml.Numbers.Currencies == nil {
continue
}
langIndex, ok := language.CompactIndex(language.MustParse(lang))
if !ok {
log.Fatalf("No compact index for language %s", lang)
}
symbols[langIndex] = make([][numTypes]*string, b.numCurrencies+1)
for _, c := range ldml.Numbers.Currencies.Currency {
syms := cldr.MakeSlice(&c.Symbol)
syms.SelectDraft(d)
for _, sym := range c.Symbol {
v := sym.Data()
if v == c.Type {
// We define "" to mean the ISO symbol.
v = ""
}
cur := b.currencies.Index([]byte(c.Type))
if cur == -1 {
fmt.Println("Unsupported:", c.Type) // TODO: mark MVP as supported.
continue
}
switch sym.Alt {
case "":
symbols[langIndex][cur][normal] = &v
case "narrow":
symbols[langIndex][cur][narrow] = &v
}
}
}
}
// Remove values identical to the parent.
for langIndex, data := range symbols {
for curIndex, curs := range data {
for typ, sym := range curs {
if sym == nil {
continue
}
for p := uint16(langIndex); p != 0; {
p = internal.Parent[p]
x := symbols[p]
if x == nil {
continue
}
if v := x[curIndex][typ]; v != nil || p == 0 {
// Value is equal to the default value root value is undefined.
parentSym := ""
if v != nil {
parentSym = *v
}
if parentSym == *sym {
// Value is the same as parent.
data[curIndex][typ] = nil
}
break
}
}
}
}
}
// Create symbol index.
symbolData := []byte{0}
symbolLookup := map[string]uint16{"": 0} // 0 means default, so block that value.
for _, data := range symbols {
for _, curs := range data {
for _, sym := range curs {
if sym == nil {
continue
}
if _, ok := symbolLookup[*sym]; !ok {
symbolLookup[*sym] = uint16(len(symbolData))
symbolData = append(symbolData, byte(len(*sym)))
symbolData = append(symbolData, *sym...)
}
}
}
}
w.WriteComment(`
symbols holds symbol data of the form <n> <str>, where n is the length of
the symbol string str.`)
w.WriteConst("symbols", string(symbolData))
// Create index from language to currency lookup to symbol.
type curToIndex struct{ cur, idx uint16 }
w.WriteType(curToIndex{})
prefix := []string{"normal", "narrow"}
// Create data for regular and narrow symbol data.
for typ := normal; typ <= narrow; typ++ {
indexes := []curToIndex{} // maps currency to symbol index
languages := []uint16{}
for _, data := range symbols {
languages = append(languages, uint16(len(indexes)))
for curIndex, curs := range data {
if sym := curs[typ]; sym != nil {
indexes = append(indexes, curToIndex{uint16(curIndex), symbolLookup[*sym]})
}
}
}
languages = append(languages, uint16(len(indexes)))
w.WriteVar(prefix[typ]+"LangIndex", languages)
w.WriteVar(prefix[typ]+"SymIndex", indexes)
}
}