func()

in internal/language/gen.go [1203:1356]

• 148 lines of code
• 32 McCabe index (conditional complexity)

func (b *builder) writeLikelyData() {
	const (
		isList = 1 << iota
		scriptInFrom
		regionInFrom
	)
	type ( // generated types
		likelyScriptRegion struct {
			region uint16
			script uint8
			flags  uint8
		}
		likelyLangScript struct {
			lang   uint16
			script uint8
			flags  uint8
		}
		likelyLangRegion struct {
			lang   uint16
			region uint16
		}
		// likelyTag is used for getting likely tags for group regions, where
		// the likely region might be a region contained in the group.
		likelyTag struct {
			lang   uint16
			region uint16
			script uint8
		}
	)
	var ( // generated variables
		likelyRegionGroup = make([]likelyTag, len(b.groups))
		likelyLang        = make([]likelyScriptRegion, len(b.lang.s))
		likelyRegion      = make([]likelyLangScript, len(b.region.s))
		likelyScript      = make([]likelyLangRegion, len(b.script.s))
		likelyLangList    = []likelyScriptRegion{}
		likelyRegionList  = []likelyLangScript{}
	)
	type fromTo struct {
		from, to []string
	}
	langToOther := map[int][]fromTo{}
	regionToOther := map[int][]fromTo{}
	for _, m := range b.supp.LikelySubtags.LikelySubtag {
		from := strings.Split(m.From, "_")
		to := strings.Split(m.To, "_")
		if len(to) != 3 {
			log.Fatalf("invalid number of subtags in %q: found %d, want 3", m.To, len(to))
		}
		if len(from) > 3 {
			log.Fatalf("invalid number of subtags: found %d, want 1-3", len(from))
		}
		if from[0] != to[0] && from[0] != "und" {
			log.Fatalf("unexpected language change in expansion: %s -> %s", from, to)
		}
		if len(from) == 3 {
			if from[2] != to[2] {
				log.Fatalf("unexpected region change in expansion: %s -> %s", from, to)
			}
			if from[0] != "und" {
				log.Fatalf("unexpected fully specified from tag: %s -> %s", from, to)
			}
		}
		if len(from) == 1 || from[0] != "und" {
			id := 0
			if from[0] != "und" {
				id = b.lang.index(from[0])
			}
			langToOther[id] = append(langToOther[id], fromTo{from, to})
		} else if len(from) == 2 && len(from[1]) == 4 {
			sid := b.script.index(from[1])
			likelyScript[sid].lang = uint16(b.langIndex(to[0]))
			likelyScript[sid].region = uint16(b.region.index(to[2]))
		} else {
			r := b.region.index(from[len(from)-1])
			if id, ok := b.groups[r]; ok {
				if from[0] != "und" {
					log.Fatalf("region changed unexpectedly: %s -> %s", from, to)
				}
				likelyRegionGroup[id].lang = uint16(b.langIndex(to[0]))
				likelyRegionGroup[id].script = uint8(b.script.index(to[1]))
				likelyRegionGroup[id].region = uint16(b.region.index(to[2]))
			} else {
				regionToOther[r] = append(regionToOther[r], fromTo{from, to})
			}
		}
	}
	b.writeType(likelyLangRegion{})
	b.writeSlice("likelyScript", likelyScript)

	for id := range b.lang.s {
		list := langToOther[id]
		if len(list) == 1 {
			likelyLang[id].region = uint16(b.region.index(list[0].to[2]))
			likelyLang[id].script = uint8(b.script.index(list[0].to[1]))
		} else if len(list) > 1 {
			likelyLang[id].flags = isList
			likelyLang[id].region = uint16(len(likelyLangList))
			likelyLang[id].script = uint8(len(list))
			for _, x := range list {
				flags := uint8(0)
				if len(x.from) > 1 {
					if x.from[1] == x.to[2] {
						flags = regionInFrom
					} else {
						flags = scriptInFrom
					}
				}
				likelyLangList = append(likelyLangList, likelyScriptRegion{
					region: uint16(b.region.index(x.to[2])),
					script: uint8(b.script.index(x.to[1])),
					flags:  flags,
				})
			}
		}
	}
	// TODO: merge suppressScript data with this table.
	b.writeType(likelyScriptRegion{})
	b.writeSlice("likelyLang", likelyLang)
	b.writeSlice("likelyLangList", likelyLangList)

	for id := range b.region.s {
		list := regionToOther[id]
		if len(list) == 1 {
			likelyRegion[id].lang = uint16(b.langIndex(list[0].to[0]))
			likelyRegion[id].script = uint8(b.script.index(list[0].to[1]))
			if len(list[0].from) > 2 {
				likelyRegion[id].flags = scriptInFrom
			}
		} else if len(list) > 1 {
			likelyRegion[id].flags = isList
			likelyRegion[id].lang = uint16(len(likelyRegionList))
			likelyRegion[id].script = uint8(len(list))
			for i, x := range list {
				if len(x.from) == 2 && i != 0 || i > 0 && len(x.from) != 3 {
					log.Fatalf("unspecified script must be first in list: %v at %d", x.from, i)
				}
				x := likelyLangScript{
					lang:   uint16(b.langIndex(x.to[0])),
					script: uint8(b.script.index(x.to[1])),
				}
				if len(list[0].from) > 2 {
					x.flags = scriptInFrom
				}
				likelyRegionList = append(likelyRegionList, x)
			}
		}
	}
	b.writeType(likelyLangScript{})
	b.writeSlice("likelyRegion", likelyRegion)
	b.writeSlice("likelyRegionList", likelyRegionList)

	b.writeType(likelyTag{})
	b.writeSlice("likelyRegionGroup", likelyRegionGroup)
}