feat: query_parser + stringcase.

stringcase/snake_case.go

@@ -0,0 +1,50 @@
+package stringcase
+
+import (
+	"strings"
+)
+
+// ToSnakeCase 把字符转换为 蛇形命名法（snake_case）
+func ToSnakeCase(input string) string {
+	return SnakeCase(input)
+}
+
+func SnakeCase(s string) string {
+	return delimiterCase(s, '_', false)
+}
+
+func UpperSnakeCase(s string) string {
+	return delimiterCase(s, '_', true)
+}
+
+func delimiterCase(input string, delimiter rune, upperCase bool) string {
+	input = strings.TrimSpace(input)
+	if input == "" {
+		return input
+	}
+
+	// 使用 Split 分割字符串
+	words := Split(input)
+	filteredWords := make([]string, 0, len(words))
+	for _, word := range words {
+		if strings.TrimSpace(word) != "" {
+			filteredWords = append(filteredWords, word)
+		}
+	}
+
+	adjustCase := toLower
+	if upperCase {
+		adjustCase = toUpper
+	}
+
+	for i, word := range filteredWords {
+		runes := []rune(word)
+		for j := 0; j < len(runes); j++ {
+			runes[j] = adjustCase(runes[j])
+		}
+		filteredWords[i] = string(runes)
+	}
+
+	// 使用分隔符连接结果
+	return strings.Join(filteredWords, string(delimiter))
+}