Autoclose plugin support

internal/util/lua.go

@@ -0,0 +1,41 @@
+package util
+
+import (
+	"unicode/utf8"
+)
+
+func LuaRuneAt(str string, runeidx int) string {
+	i := 0
+	for len(str) > 0 {
+		r, size := utf8.DecodeRuneInString(str)
+
+		str = str[size:]
+
+		if i == runeidx {
+			return string(r)
+		}
+
+		i++
+	}
+	return ""
+}
+
+func LuaGetLeadingWhitespace(s string) string {
+	ws := []byte{}
+	for len(s) > 0 {
+		r, size := utf8.DecodeRuneInString(s)
+		if r == ' ' || r == '\t' {
+			ws = append(ws, byte(r))
+		} else {
+			break
+		}
+
+		s = s[size:]
+	}
+	return string(ws)
+}
+
+func LuaIsWordChar(s string) bool {
+	r, _ := utf8.DecodeRuneInString(s)
+	return IsWordChar(r)
+}