Golang CodeWriter.Size方法代码示例

// writeKeys writes keys to a special index used by the display package.
// tags are assumed to be sorted by length.
func writeKeys(w *gen.CodeWriter, name string, keys []string) {
	w.Size += int(3 * reflect.TypeOf("").Size())
	w.WriteComment("Number of keys: %d", len(keys))
	fmt.Fprintf(w, "var (\n\t%sIndex = tagIndex{\n", name)
	for i := 2; i <= 4; i++ {
		sub := []string{}
		for _, t := range keys {
			if len(t) != i {
				break
			}
			sub = append(sub, t)
		}
		s := strings.Join(sub, "")
		w.WriteString(s)
		fmt.Fprintf(w, ",\n")
		keys = keys[len(sub):]
	}
	fmt.Fprintln(w, "\t}")
	if len(keys) > 0 {
		w.Size += int(reflect.TypeOf([]string{}).Size())
		fmt.Fprintf(w, "\t%sTagsLong = ", name)
		w.WriteSlice(keys)
	}
	fmt.Fprintln(w, ")\n")
}

// WriteTable writes an entry for a single Namer.
func (g *group) writeTable(w *gen.CodeWriter, name string) {
	start := w.Size
	writeKeys(w, name, g.toTags)
	w.Size += len(g.headers) * int(reflect.ValueOf(g.headers[0]).Type().Size())

	fmt.Fprintf(w, "var %sHeaders = [%d]header{\n", name, len(g.headers))

	title := strings.Title(name)
	for _, h := range g.headers {
		h.writeEntry(w, title)
	}
	fmt.Fprintln(w, "}\n")

	for _, h := range g.headers {
		h.writeSingle(w, title)
	}
	n := w.Size - start
	fmt.Fprintf(w, "// Total size for %s: %d bytes (%d KB)\n\n", name, n, n/1000)
}

func genNumSystem(w *gen.CodeWriter, data *cldr.CLDR) {
	numSysData := []systemData{
		{digitSize: 1, zero: [4]byte{'0'}},
	}

	for _, ns := range data.Supplemental().NumberingSystems.NumberingSystem {
		if len(ns.Digits) == 0 {
			continue
		}
		switch ns.Id {
		case "latn":
			// hard-wired
			continue
		case "hanidec":
			// non-consecutive digits: treat as "algorithmic"
			continue
		}

		zero, sz := utf8.DecodeRuneInString(ns.Digits)
		if ns.Digits[sz-1]+9 > 0xBF { // 1011 1111: highest continuation byte
			log.Fatalf("Last byte of zero value overflows for %s", ns.Id)
		}

		i := rune(0)
		for _, r := range ns.Digits {
			// Verify that we can do simple math on the UTF-8 byte sequence
			// of zero to get the digit.
			if zero+i != r {
				// Runes not consecutive.
				log.Fatalf("Digit %d of %s (%U) is not offset correctly from zero value", i, ns.Id, r)
			}
			i++
		}
		var x [utf8.UTFMax]byte
		utf8.EncodeRune(x[:], zero)
		id := system(len(numSysData))
		systemMap[ns.Id] = id
		numSysData = append(numSysData, systemData{
			id:        id,
			digitSize: byte(sz),
			zero:      x,
		})
	}
	w.WriteVar("numSysData", numSysData)

	algoID := system(len(numSysData))
	fmt.Fprintln(w, "const (")
	for _, ns := range data.Supplemental().NumberingSystems.NumberingSystem {
		id, ok := systemMap[ns.Id]
		if !ok {
			id = algoID
			systemMap[ns.Id] = id
			algoID++
		}
		fmt.Fprintf(w, "num%s = %#x\n", strings.Title(ns.Id), id)
	}
	fmt.Fprintln(w, "numNumberSystems")
	fmt.Fprintln(w, ")")

	fmt.Fprintln(w, "var systemMap = map[string]system{")
	for _, ns := range data.Supplemental().NumberingSystems.NumberingSystem {
		fmt.Fprintf(w, "%q: num%s,\n", ns.Id, strings.Title(ns.Id))
		w.Size += len(ns.Id) + 16 + 1 // very coarse approximation
	}
	fmt.Fprintln(w, "}")
}