Update emoji dataset with skin tone variants (#11678)

* Update emoji dataset with skin tone variants

Since the format of emoji that support skin tone modifiers is predictable we can add different variants into our dataset when generating it so that we can match and properly style most skin tone variants of emoji. No real code change here other than what generates the dataset and the data itself.

* use escape unicode sequence in map

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

build/generate-emoji.go

@@ -19,6 +19,7 @@ import (
 	"sort"
 	"strconv"
 	"strings"
+	"unicode/utf8"
 )
 
 const (
@@ -39,6 +40,7 @@ type Emoji struct {
 	Description    string   `json:"description,omitempty"`
 	Aliases        []string `json:"aliases"`
 	UnicodeVersion string   `json:"unicode_version,omitempty"`
+	SkinTones      bool     `json:"skin_tones,omitempty"`
 }
 
 // Don't include some fields in JSON
@@ -47,6 +49,7 @@ func (e Emoji) MarshalJSON() ([]byte, error) {
 	x := emoji(e)
 	x.UnicodeVersion = ""
 	x.Description = ""
+	x.SkinTones = false
 	return json.Marshal(x)
 }
 
@@ -75,6 +78,7 @@ var replacer = strings.NewReplacer(
 	", Description:", ", ",
 	", Aliases:", ", ",
 	", UnicodeVersion:", ", ",
+	", SkinTones:", ", ",
 )
 
 var emojiRE = regexp.MustCompile(`\{Emoji:"([^"]*)"`)
@@ -102,18 +106,20 @@ func generate() ([]byte, error) {
 		return nil, err
 	}
 
-	var re = regexp.MustCompile(`keycap|registered|copyright`)
-	tmp := data[:0]
+	var skinTones = make(map[string]string)
+
+	skinTones["\U0001f3fb"] = "Light Skin Tone"
+	skinTones["\U0001f3fc"] = "Medium-Light Skin Tone"
+	skinTones["\U0001f3fd"] = "Medium Skin Tone"
+	skinTones["\U0001f3fe"] = "Medium-Dark Skin Tone"
+	skinTones["\U0001f3ff"] = "Dark Skin Tone"
+
+	var tmp Gemoji
 
 	//filter out emoji that require greater than max unicode version
 	for i := range data {
 		val, _ := strconv.ParseFloat(data[i].UnicodeVersion, 64)
 		if int(val) <= maxUnicodeVersion {
-			// remove these keycaps for now they really complicate matching since
-			// they include normal letters in them
-			if re.MatchString(data[i].Description) {
-				continue
-			}
 			tmp = append(tmp, data[i])
 		}
 	}
@@ -123,7 +129,6 @@ func generate() ([]byte, error) {
 		return data[i].Aliases[0] < data[j].Aliases[0]
 	})
 
-	aliasPairs := make([]string, 0)
 	aliasMap := make(map[string]int, len(data))
 
 	for i, e := range data {
@@ -135,7 +140,6 @@ func generate() ([]byte, error) {
 				continue
 			}
 			aliasMap[a] = i
-			aliasPairs = append(aliasPairs, ":"+a+":", e.Emoji)
 		}
 	}
 
@@ -149,6 +153,43 @@ func generate() ([]byte, error) {
 		data[i].Aliases = append(data[i].Aliases, "laugh")
 	}
 
+	// write a JSON file to use with tribute (write before adding skin tones since we can't support them there yet)
+	file, _ := json.Marshal(data)
+	_ = ioutil.WriteFile("assets/emoji.json", file, 0644)
+
+	// Add skin tones to emoji that support it
+	var (
+		s              []string
+		newEmoji       string
+		newDescription string
+		newData        Emoji
+	)
+
+	for i := range data {
+		if data[i].SkinTones {
+			for k, v := range skinTones {
+				s = strings.Split(data[i].Emoji, "")
+
+				if utf8.RuneCountInString(data[i].Emoji) == 1 {
+					s = append(s, k)
+				} else {
+					// insert into slice after first element because all emoji that support skin tones
+					// have that modifer placed at this spot
+					s = append(s, "")
+					copy(s[2:], s[1:])
+					s[1] = k
+				}
+
+				newEmoji = strings.Join(s, "")
+				newDescription = data[i].Description + ": " + v
+				newAlias := data[i].Aliases[0] + "_" + strings.ReplaceAll(v, " ", "_")
+
+				newData = Emoji{newEmoji, newDescription, []string{newAlias}, "12.0", false}
+				data = append(data, newData)
+			}
+		}
+	}
+
 	// add header
 	str := replacer.Replace(fmt.Sprintf(hdr, gemojiURL, data))
 
@@ -162,10 +203,6 @@ func generate() ([]byte, error) {
 		return "{" + strconv.QuoteToASCII(s)
 	})
 
-	// write a JSON file to use with tribute
-	file, _ := json.Marshal(data)
-	_ = ioutil.WriteFile("assets/emoji.json", file, 0644)
-
 	// format
 	return format.Source([]byte(str))
 }

modules/emoji/emoji.go

@@ -9,7 +9,6 @@ import (
 	"sort"
 	"strings"
 	"sync"
-	"unicode/utf8"
 )
 
 // Gemoji is a set of emoji data.
@@ -21,6 +20,7 @@ type Emoji struct {
 	Description    string
 	Aliases        []string
 	UnicodeVersion string
+	SkinTones      bool
 }
 
 var (
@@ -131,11 +131,12 @@ func ReplaceAliases(s string) string {
 func FindEmojiSubmatchIndex(s string) []int {
 	loadMap()
 
-	// if rune and string length are the same then no emoji will be present
-	// similar performance when there is unicode present but almost 200% faster when not
-	if utf8.RuneCountInString(s) == len(s) {
+	//see if there are any emoji in string before looking for position of specific ones
+	//no performance difference when there is a match but 10x faster when there are not
+	if s == ReplaceCodes(s) {
 		return nil
 	}
+
 	for j := range GemojiData {
 		i := strings.Index(s, GemojiData[j].Emoji)
 		if i != -1 {