lazy initialize html5entities

_benchmark/go/go.mod

@@ -6,7 +6,7 @@ require (
 	github.com/88250/lute v1.7.5
 	github.com/gomarkdown/markdown v0.0.0-20230322041520-c84983bdbf2a
 	github.com/russross/blackfriday/v2 v2.1.0
-	github.com/yuin/goldmark v1.2.1
+	github.com/yuin/goldmark v0.0.0
 	gitlab.com/golang-commonmark/markdown v0.0.0-20211110145824-bf3e522c626a
 )
 
@@ -22,3 +22,4 @@ require (
 )
 
 replace gopkg.in/russross/blackfriday.v2 v2.0.1 => github.com/russross/blackfriday/v2 v2.0.1
+replace github.com/yuin/goldmark v0.0.0 => ../../

util/html5entities.go

@@ -1,6 +1,8 @@
 //nolint:golint,lll,misspell
 package util
 
+import "sync"
+
 // An HTML5Entity struct represents HTML5 entitites.
 type HTML5Entity struct {
 	Name       string
@@ -11,11 +13,18 @@ type HTML5Entity struct {
 // LookUpHTML5EntityByName returns (an HTML5Entity, true) if an entity named
 // given name is found, otherwise (nil, false).
 func LookUpHTML5EntityByName(name string) (*HTML5Entity, bool) {
-	v, ok := html5entities[name]
+	v, ok := html5entities()[name]
 	return v, ok
 }
 
-var html5entities = map[string]*HTML5Entity{
+var html5entitiesOnce sync.Once // TODO: uses sync.OnceValue for future
+
+var _html5entities map[string]*HTML5Entity
+
+func html5entities() map[string]*HTML5Entity {
+	html5entitiesOnce.Do(func() {
+		_html5entities =
+			map[string]*HTML5Entity{
 				"AElig":                           {Name: "AElig", CodePoints: []int{198}, Characters: []byte{0xc3, 0x86}},
 				"AMP":                             {Name: "AMP", CodePoints: []int{38}, Characters: []byte{0x26}},
 				"Aacute":                          {Name: "Aacute", CodePoints: []int{193}, Characters: []byte{0xc3, 0x81}},
@@ -2140,4 +2149,7 @@ var html5entities = map[string]*HTML5Entity{
 				"zscr":                            {Name: "zscr", CodePoints: []int{120015}, Characters: []byte{0xf0, 0x9d, 0x93, 0x8f}},
 				"zwj":                             {Name: "zwj", CodePoints: []int{8205}, Characters: []byte{0xe2, 0x80, 0x8d}},
 				"zwnj":                            {Name: "zwnj", CodePoints: []int{8204}, Characters: []byte{0xe2, 0x80, 0x8c}},
+			}
+	})
+	return _html5entities
 }