JavaScriptEngine android implementation

Author: Tetraquark

javascript/src/androidMain/AndroidManifest.xml

@@ -1,2 +1,2 @@
 <?xml version="1.0" encoding="utf-8"?>
-<manifest package="dev.icerock.moko.javascript" />
+<manifest package="dev.icerock.moko.javascript" />

javascript/src/androidMain/kotlin/dev/icerock/moko/javascript/JavaScriptEngine.kt

@@ -0,0 +1,69 @@
+/*
+ * Copyright 2021 IceRock MAG Inc. Use of this source code is governed by the Apache 2.0 license.
+ */
+
+package dev.icerock.moko.javascript
+
+import app.cash.quickjs.QuickJs
+import app.cash.quickjs.QuickJsException
+import kotlinx.serialization.SerializationException
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.encodeToJsonElement
+
+actual class JavaScriptEngine actual constructor(){
+    private val quickJs: QuickJs = QuickJs.create()
+    private val json: Json = Json.Default
+
+    @Volatile
+    var isClosed = false
+        private set
+
+    actual fun evaluate(
+        context: Map<String, JsType>,
+        script: String
+    ): JsType {
+        if (isClosed) throw JavaScriptEvaluationException(message = "Engine already closed")
+
+        return try {
+            internalEvaluate(context, script)
+        } catch (exception: QuickJsException) {
+            throw JavaScriptEvaluationException(exception)
+        }
+    }
+
+    actual fun close() {
+        if (isClosed) return
+        quickJs.close()
+        isClosed = true
+    }
+
+    private fun internalEvaluate(
+        context: Map<String, JsType>,
+        script: String
+    ): JsType {
+        context.forEach { pair ->
+            quickJs.set(pair.key, pair.value.javaClass, pair.value)
+        }
+        val result = quickJs.evaluate(script)
+        return handleQuickJsResult(result)
+    }
+
+    private fun handleQuickJsResult(result: Any?): JsType {
+        if (result is String) {
+            return try {
+                JsType.Json(json.encodeToJsonElement(result))
+            } catch (ex: SerializationException) {
+                JsType.Str(result)
+            }
+        }
+
+        return when (result) {
+            result == null -> JsType.Null
+            is Boolean -> JsType.Bool(result)
+            is Int -> JsType.IntNum(result)
+            is Double -> JsType.DoubleNum(result)
+            is Float -> JsType.DoubleNum(result.toDouble())
+            else -> throw IllegalStateException("Impossible JavaScriptEngine handler state")
+        }
+    }
+}