mirror of
https://github.com/wgh136/flutter_qjs.git
synced 2025-09-27 05:27:23 +00:00
292 lines
8.1 KiB
Dart
292 lines
8.1 KiB
Dart
/*
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* @Description:
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* @Author: ekibun
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* @Date: 2020-09-19 22:07:47
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* @LastEditors: ekibun
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* @LastEditTime: 2020-09-24 13:38:08
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*/
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import 'dart:async';
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import 'dart:ffi';
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import 'dart:typed_data';
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import 'package:ffi/ffi.dart';
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import 'ffi.dart';
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class JSRefValue implements JSRef {
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Pointer val;
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Pointer ctx;
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JSRefValue(this.ctx, Pointer val) {
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Pointer rt = jsGetRuntime(ctx);
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this.val = jsDupValue(ctx, val);
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runtimeOpaques[rt]?.ref?.add(this);
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}
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@override
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void release() {
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if (val != null) {
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jsFreeValue(ctx, val);
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}
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val = null;
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ctx = null;
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}
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}
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class JSPromise extends JSRefValue {
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Completer completer;
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JSPromise(Pointer ctx, Pointer val, this.completer) : super(ctx, val);
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@override
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void release() {
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super.release();
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if (!completer.isCompleted) {
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completer.completeError("Promise cannot resolve");
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}
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}
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bool checkResolveReject() {
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if (val == null || completer.isCompleted) return true;
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var status = jsToDart(ctx, val);
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if (status["__resolved"] == true) {
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completer.complete(status["__value"]);
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return true;
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}
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if (status["__rejected"] == true) {
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completer.completeError(parseJSException(
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ctx,
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e: jsGetPropertyStr(ctx, val, "__error"),
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));
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return true;
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}
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return false;
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}
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}
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class JSFunction extends JSRefValue {
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JSFunction(Pointer ctx, Pointer val) : super(ctx, val);
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@override
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noSuchMethod(Invocation invocation) {
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if (val == null) return;
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List<Pointer> args = invocation.positionalArguments
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.map(
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(e) => dartToJs(ctx, e),
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)
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.toList();
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Pointer jsRet = jsCall(ctx, val, null, args);
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for (Pointer jsArg in args) {
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jsFreeValue(ctx, jsArg);
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}
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bool isException = jsIsException(jsRet) != 0;
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var ret = jsToDart(ctx, jsRet);
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jsFreeValue(ctx, jsRet);
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if (isException) {
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throw Exception(parseJSException(ctx));
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}
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return ret;
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}
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}
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Pointer jsGetPropertyStr(Pointer ctx, Pointer val, String prop) {
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var jsAtomVal = jsNewString(ctx, prop);
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var jsAtom = jsValueToAtom(ctx, jsAtomVal);
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Pointer jsProp = jsGetProperty(ctx, val, jsAtom);
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jsFreeAtom(ctx, jsAtom);
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jsFreeValue(ctx, jsAtomVal);
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return jsProp;
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}
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String parseJSException(Pointer ctx, {Pointer e}) {
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e = e ?? jsGetException(ctx);
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var err = jsToCString(ctx, e);
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if (jsValueGetTag(e) == JSTag.OBJECT) {
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Pointer stack = jsGetPropertyStr(ctx, e, "stack");
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if (jsToBool(ctx, stack) != 0) {
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err += '\n' + jsToCString(ctx, stack);
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}
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jsFreeValue(ctx, stack);
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}
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jsFreeValue(ctx, e);
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return err;
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}
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Pointer dartToJs(Pointer ctx, dynamic val, {Map<dynamic, dynamic> cache}) {
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if (val is Future) {
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var resolvingFunc = allocate<Uint8>(count: sizeOfJSValue * 2);
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var resolvingFunc2 =
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Pointer.fromAddress(resolvingFunc.address + sizeOfJSValue);
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var ret = jsNewPromiseCapability(ctx, resolvingFunc);
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var res = jsToDart(ctx, resolvingFunc);
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var rej = jsToDart(ctx, resolvingFunc2);
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jsFreeValue(ctx, resolvingFunc);
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jsFreeValue(ctx, resolvingFunc2);
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free(resolvingFunc);
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val.then((value) {
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res(value);
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}, onError: (e, stack) {
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rej(e.toString() + "\n" + stack.toString());
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});
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return ret;
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}
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if (cache == null) cache = Map();
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if (val is bool) return jsNewBool(ctx, val ? 1 : 0);
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if (val is int) return jsNewInt64(ctx, val);
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if (val is double) return jsNewFloat64(ctx, val);
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if (val is String) return jsNewString(ctx, val);
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if (val is Uint8List) {
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var ptr = allocate<Uint8>(count: val.length);
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var byteList = ptr.asTypedList(val.length);
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byteList.setAll(0, val);
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var ret = jsNewArrayBufferCopy(ctx, ptr, val.length);
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free(ptr);
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return ret;
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}
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if (cache.containsKey(val)) {
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return jsDupValue(ctx, cache[val]);
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}
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if (val is JSFunction) {
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return jsDupValue(ctx, val.val);
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}
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if (val is List) {
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Pointer ret = jsNewArray(ctx);
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cache[val] = ret;
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for (int i = 0; i < val.length; ++i) {
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var jsAtomVal = jsNewInt64(ctx, i);
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var jsAtom = jsValueToAtom(ctx, jsAtomVal);
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jsDefinePropertyValue(
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ctx,
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ret,
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jsAtom,
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dartToJs(ctx, val[i], cache: cache),
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JSProp.C_W_E,
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);
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jsFreeAtom(ctx, jsAtom);
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jsFreeValue(ctx, jsAtomVal);
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}
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return ret;
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}
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if (val is Map) {
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Pointer ret = jsNewObject(ctx);
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cache[val] = ret;
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for (MapEntry<dynamic, dynamic> entry in val.entries) {
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var jsAtomVal = dartToJs(ctx, entry.key, cache: cache);
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var jsAtom = jsValueToAtom(ctx, jsAtomVal);
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jsDefinePropertyValue(
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ctx,
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ret,
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jsAtom,
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dartToJs(ctx, entry.value, cache: cache),
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JSProp.C_W_E,
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);
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jsFreeAtom(ctx, jsAtom);
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jsFreeValue(ctx, jsAtomVal);
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}
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return ret;
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}
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return jsUNDEFINED();
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}
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dynamic jsToDart(Pointer ctx, Pointer val, {Map<int, dynamic> cache}) {
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if (cache == null) cache = Map();
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int tag = jsValueGetTag(val);
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if (jsTagIsFloat64(tag) != 0) {
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return jsToFloat64(ctx, val);
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}
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switch (tag) {
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case JSTag.BOOL:
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return jsToBool(ctx, val) != 0;
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case JSTag.INT:
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return jsToInt64(ctx, val);
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case JSTag.STRING:
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return jsToCString(ctx, val);
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case JSTag.OBJECT:
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Pointer<Int64> psize = allocate<Int64>();
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Pointer<Uint8> buf = jsGetArrayBuffer(ctx, psize, val);
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int size = psize.value;
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free(psize);
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if (buf.address != 0) {
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return Uint8List.fromList(buf.asTypedList(size));
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}
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int valptr = jsValueGetPtr(val).address;
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if (cache.containsKey(valptr)) {
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return cache[valptr];
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}
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if (jsIsFunction(ctx, val) != 0) {
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return JSFunction(ctx, val);
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} else if (jsIsArray(ctx, val) != 0) {
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Pointer jslength = jsGetPropertyStr(ctx, val, "length");
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int length = jsToInt64(ctx, jslength);
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List<dynamic> ret = List();
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cache[valptr] = ret;
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for (int i = 0; i < length; ++i) {
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var jsAtomVal = jsNewInt64(ctx, i);
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var jsAtom = jsValueToAtom(ctx, jsAtomVal);
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var jsProp = jsGetProperty(ctx, val, jsAtom);
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jsFreeAtom(ctx, jsAtom);
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jsFreeValue(ctx, jsAtomVal);
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ret.add(jsToDart(ctx, jsProp, cache: cache));
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jsFreeValue(ctx, jsProp);
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}
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return ret;
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} else {
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Pointer<Pointer> ptab = allocate<Pointer>();
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Pointer<Uint32> plen = allocate<Uint32>();
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if (jsGetOwnPropertyNames(ctx, ptab, plen, val, -1) != 0) return null;
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int len = plen.value;
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free(plen);
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Map<dynamic, dynamic> ret = Map();
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cache[valptr] = ret;
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for (int i = 0; i < len; ++i) {
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var jsAtom = jsPropertyEnumGetAtom(ptab.value, i);
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var jsAtomValue = jsAtomToValue(ctx, jsAtom);
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var jsProp = jsGetProperty(ctx, val, jsAtom);
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ret[jsToDart(ctx, jsAtomValue, cache: cache)] =
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jsToDart(ctx, jsProp, cache: cache);
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jsFreeValue(ctx, jsAtomValue);
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jsFreeValue(ctx, jsProp);
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jsFreeAtom(ctx, jsAtom);
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}
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free(ptab);
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return ret;
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}
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break;
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default:
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}
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return null;
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}
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Pointer jsNewContextWithPromsieWrapper(Pointer rt) {
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var ctx = jsNewContext(rt);
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var jsPromiseWrapper = jsEval(
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ctx,
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"""
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(value) => {
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const __ret = Promise.resolve(value)
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.then(v => {
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__ret.__value = v;
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__ret.__resolved = true;
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}).catch(e => {
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__ret.__error = e;
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__ret.__rejected = true;
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});
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return __ret;
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}
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""",
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"<future>",
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JSEvalType.GLOBAL);
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var promiseWrapper = JSRefValue(ctx, jsPromiseWrapper);
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jsFreeValue(ctx, jsPromiseWrapper);
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runtimeOpaques[rt].promsieToFuture = (promise) {
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var completer = Completer();
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var wrapper = promiseWrapper.val;
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if (wrapper == null)
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completer.completeError(Exception("Runtime has been released!"));
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var jsPromise = jsCall(ctx, wrapper, null, [promise]);
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runtimeOpaques[rt].ref.add(JSPromise(ctx, jsPromise, completer));
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jsFreeValue(ctx, jsPromise);
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return completer.future;
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};
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return ctx;
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}
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