[WIP] Switch to GraalJS Engine (#793)

* Switch to GraalJS Engine

* Update Polygot

AndroidCompat/src/main/java/app/cash/quickjs/QuickJs.java

@@ -1,69 +1,98 @@
 package app.cash.quickjs;
 
-import org.mozilla.javascript.ConsString;
-import org.mozilla.javascript.NativeArray;
+import org.graalvm.polyglot.*;
 
-import javax.script.ScriptEngine;
-import javax.script.ScriptEngineManager;
 import java.io.Closeable;
+import java.math.BigInteger;
+import java.util.Arrays;
 
 public final class QuickJs implements Closeable {
-    private ScriptEngine engine;
+    private Context context;
 
     public static QuickJs create() {
-        return new QuickJs(new ScriptEngineManager());
+        return new QuickJs();
     }
 
-    public QuickJs(ScriptEngineManager manager) {
-        this.engine = manager.getEngineByName("rhino");
+    public QuickJs() {
+        this.context = Context
+                .newBuilder("js")
+                .allowHostAccess(HostAccess.ALL)
+                .allowPolyglotAccess(PolyglotAccess.NONE)
+                .allowHostClassLoading(false)
+                .build();
+        context.enter();
     }
 
-    public Object evaluate(String script, String fileName) {
+    public Object evaluate(String script, String ignoredFileName) {
         return this.evaluate(script);
     }
 
     public Object evaluate(String script) {
         try {
-            Object value = engine.eval(script);
+            Value value = context.eval("js", script);
             return translateType(value);
         } catch (Exception exception) {
             throw new QuickJsException(exception.getMessage(), exception);
         }
     }
 
-    private Object translateType(Object obj) {
-        if (obj instanceof NativeArray) {
-            NativeArray array = (NativeArray) obj;
-            long length = array.getLength();
-            Object[] objects = new Object[(int) length];
-            for (int i = 0; i < (int) length; i++) {
-                objects[i] = translateType(array.get(i));
+    private Object translateType(Value obj) {
+        if (obj.isBoolean()) {
+            return obj.asBoolean();
+        } else if (obj.hasArrayElements()) {
+            if (obj.getArraySize() == 0) {
+                return new int[0];
+            } else {
+                Value element = obj.getArrayElement(0);
+                if (element.isBoolean()) {
+                    return obj.as(boolean[].class);
+                } else if (element.isNumber()) {
+                    if (element.fitsInInt()) {
+                        return obj.as(int[].class);
+                    } else if (element.fitsInBigInteger()) {
+                        return Arrays.stream(obj.as(BigInteger[].class)).map(BigInteger::longValue).toArray();
+                    } else {
+                        return obj.as(double[].class);
+                    }
+                } else if (element.isHostObject()) {
+                    return obj.as(Object[].class);
+                } else if (element.isString()) {
+                    return obj.as(String[].class);
+                }
             }
-            return objects;
-        }
-        if (obj instanceof ConsString) {
-            ConsString consString = (ConsString) obj;
-            return consString.toString();
-        }
-        if (obj instanceof Long) {
-            Long value = (Long) obj;
-            return value.intValue();
+        } else if (obj.isNumber()) {
+            if (obj.fitsInInt()) {
+                return obj.asInt();
+            } else if (obj.fitsInBigInteger()) {
+                return obj.asBigInteger().longValue();
+            } else {
+                return obj.asDouble();
+            }
+        } else if (obj.isHostObject()) {
+            return obj.asHostObject();
+        } else if (obj.isString()) {
+            return obj.asString();
         }
         return obj;
     }
 
-    public byte[] compile(String sourceCode, String fileName) {
+    public byte[] compile(String sourceCode, String ignoredFileName) {
         return sourceCode.getBytes();
     }
 
-
     public Object execute(byte[] bytecode) {
         return this.evaluate(new String(bytecode));
     }
 
+    public <T> void set(String name, Class<T> ignoredType, T object) {
+        context.getBindings("js").putMember(name, object);
+    }
+
 
     @Override
     public void close() {
-        this.engine = null;
+        this.context.leave();
+        this.context.close();
+        this.context = null;
     }
 }