58 lines
2.3 KiB
JavaScript
58 lines
2.3 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.QuickJSAsyncContext = void 0;
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const context_1 = require("./context");
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const debug_1 = require("./debug");
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const types_1 = require("./types");
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/**
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* Asyncified version of [[QuickJSContext]].
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*
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* *Asyncify* allows normally synchronous code to wait for asynchronous Promises
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* or callbacks. The asyncified version of QuickJSContext can wait for async
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* host functions as though they were synchronous.
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*/
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class QuickJSAsyncContext extends context_1.QuickJSContext {
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/**
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* Asyncified version of [[evalCode]].
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*/
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async evalCodeAsync(code, filename = "eval.js",
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/** See [[EvalFlags]] for number semantics */
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options) {
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const detectModule = (options === undefined ? 1 : 0);
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const flags = (0, types_1.evalOptionsToFlags)(options);
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let resultPtr = 0;
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try {
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resultPtr = await this.memory
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.newHeapCharPointer(code)
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.consume((charHandle) => this.ffi.QTS_Eval_MaybeAsync(this.ctx.value, charHandle.value, filename, detectModule, flags));
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}
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catch (error) {
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(0, debug_1.debugLog)("QTS_Eval_MaybeAsync threw", error);
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throw error;
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}
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const errorPtr = this.ffi.QTS_ResolveException(this.ctx.value, resultPtr);
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if (errorPtr) {
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this.ffi.QTS_FreeValuePointer(this.ctx.value, resultPtr);
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return { error: this.memory.heapValueHandle(errorPtr) };
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}
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return { value: this.memory.heapValueHandle(resultPtr) };
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}
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/**
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* Similar to [[newFunction]].
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* Convert an async host Javascript function into a synchronous QuickJS function value.
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*
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* Whenever QuickJS calls this function, the VM's stack will be unwound while
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* waiting the async function to complete, and then restored when the returned
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* promise resolves.
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*
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* Asyncified functions must never call other asyncified functions or
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* `import`, even indirectly, because the stack cannot be unwound twice.
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*
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* See [Emscripten's docs on Asyncify](https://emscripten.org/docs/porting/asyncify.html).
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*/
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newAsyncifiedFunction(name, fn) {
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return this.newFunction(name, fn);
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}
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}
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exports.QuickJSAsyncContext = QuickJSAsyncContext;
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//# sourceMappingURL=context-asyncify.js.map
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