feat: add caculate parse

src/main/kotlin/cn/rtast/fancybot/commands/parse/CalculateCommand.kt

@@ -0,0 +1,25 @@
+/*
+ * Copyright © 2024 RTAkland
+ * Author: RTAkland
+ * Date: 2024/9/21
+ */
+
+
+package cn.rtast.fancybot.commands.parse
+
+import javax.script.ScriptEngineManager
+import javax.script.ScriptException
+
+object CalculateCommand {
+
+    private val engine = ScriptEngineManager().getEngineByName("JavaScript")
+
+    fun parse(input: String): String? {
+        return try {
+            engine.eval(input)
+        } catch (_: ScriptException) {
+            "Invalid expression"
+            return null
+        }.toString()
+    }
+}