🎨 Update av

kernel/util/misc.go

@@ -0,0 +1,82 @@
+// SiYuan - Refactor your thinking
+// Copyright (c) 2020-present, b3log.org
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package util
+
+import (
+	"bytes"
+	"strings"
+	"unicode"
+
+	"github.com/88250/lute/html"
+)
+
+// InsertElement inserts a new element value at the specified index position.
+// 0 <= index <= len(a)
+func InsertElement[T any](ret []T, index int, value T) []T {
+	if len(ret) == index { // nil or empty slice or after last element
+		return append(ret, value)
+	}
+
+	ret = append(ret[:index+1], ret[index:]...) // index < len(a)
+	ret[index] = value
+	return ret
+}
+
+func EscapeHTML(s string) string {
+	if strings.Contains(s, "&amp;") {
+		return s
+	}
+	if strings.ContainsAny(s, "<>\"'") {
+		return html.EscapeString(s)
+	}
+	return s
+}
+
+func Reverse(s string) string {
+	runes := []rune(s)
+	for i, j := 0, len(runes)-1; i < j; i, j = i+1, j-1 {
+		runes[i], runes[j] = runes[j], runes[i]
+	}
+	return string(runes)
+}
+
+func RemoveRedundantSpace(str string) string {
+	buf := bytes.Buffer{}
+	lastIsChinese := false
+	lastIsSpace := false
+	for _, r := range str {
+		if unicode.IsSpace(r) {
+			if lastIsChinese || lastIsSpace {
+				continue
+			}
+			buf.WriteRune(' ')
+			lastIsChinese = false
+			lastIsSpace = true
+			continue
+		}
+
+		lastIsSpace = false
+		buf.WriteRune(r)
+		if unicode.Is(unicode.Han, r) {
+			lastIsChinese = true
+			continue
+		} else {
+			lastIsChinese = false
+		}
+	}
+	return buf.String()
+}