Squashed 'backend/goldmark/' content from commit 379bf24

git-subtree-dir: backend/goldmark
git-subtree-split: 379bf24a47e6ef07f34d7536aead86d8792ac300

util/html5entities.go

@@ -0,0 +1,47 @@
+package util
+
+import (
+	"sync"
+)
+
+//go:generate go run ../_tools emb-structs -i ../_tools/html5entities.json -o ./html5entities.gen.go
+
+var _html5entitiesOnce sync.Once
+var _html5entitiesMap map[string]*HTML5Entity
+
+func buildHTML5Entities() {
+	_html5entitiesOnce.Do(func() {
+		entities := make([]HTML5Entity, _html5entitiesLength)
+		_html5entitiesMap = make(map[string]*HTML5Entity, _html5entitiesLength)
+
+		cName := 0
+		cCharacters := 0
+		for i := range _html5entitiesLength {
+			tName := cName + int(_html5entitiesNameIndex[i])
+			tCharacters := cCharacters + int(_html5entitiesCharactersIndex[i])
+
+			name := _html5entitiesName[cName:tName]
+			e := &entities[i]
+			e.Name = name
+			e.Characters = _html5entitiesCharacters[cCharacters:tCharacters]
+			_html5entitiesMap[name] = e
+
+			cName = tName
+			cCharacters = tCharacters
+		}
+	})
+}
+
+// HTML5Entity struct represents HTML5 entitites.
+type HTML5Entity struct {
+	Name       string
+	Characters []byte
+}
+
+// LookUpHTML5EntityByName returns (an HTML5Entity, true) if an entity named
+// given name is found, otherwise (nil, false).
+func LookUpHTML5EntityByName(name string) (*HTML5Entity, bool) {
+	buildHTML5Entities()
+	v, ok := _html5entitiesMap[name]
+	return v, ok
+}