js_script

Description:

js script

js_script #
Run JS script.
Usage #
// Create a JS context.
JsScript script = JsScript();
// Define a class.
var classInfo = ClassInfo<TestClass>(
newInstance: (_) => TestClass(),
fields: {
"field": JsField.ins(
get: (obj) => obj.field,
set: (obj, val) => obj.field=val,
),
},
functions: {
"method": JsFunction.ins((obj, argv) => obj.method()),
"wait": JsFunction.ins((obj, argv) => obj.wait(argv[0])),
}
);
// Send the class info to JS context.
script.addClass(classInfo);

// Have some test.
script.eval("var obj = new TestClass()");
test("[JS] obj.field == 1", script.eval("obj.field") == 1);
test("[JS] obj.method() == 3", script.eval("obj.method()") == 3);

JsValue jsValue = script.eval("obj");
script.eval("obj.field = 3;");
test("[Dart] obj.field == 3", jsValue.dartObject.field == 3);
test("[Dart] obj.method() == 9", jsValue.dartObject.method() == 9);

{
// Send a dart object to JS context.
TestClass obj2 = TestClass();
obj2.field = 4;
JsValue jsValue = script.bind(obj2, classInfo: classInfo);
test("[JS] obj2.field == 4", jsValue["field"] == 4);
}

{
// Send a dart function to JS context.
JsValue func = script.function((argv) => "hello" + argv[0]);
test("[JS] call function", func.call(["world"]) == "helloworld");
}

{
// Using the Future as Promise in JS.
// And using the Promise as a Future.
JsValue jsPromise = script.eval("""
new Promise(async function(resolve, reject) {
await obj.wait(3);
resolve("over");
});
""");
jsPromise.retain();
var time = DateTime.now();
var res = await jsPromise.asFuture;
jsPromise.release();
test("[JS] wait for ${DateTime.now().difference(time).inMilliseconds}ms", res == "over");
}
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FileSystem #
JsScript script = JsScript(
fileSystems: [
// Add a asar file.
AsarFileSystem(await data),
// Add memory files.
MemoryFileSystem({
"/test.js": """
const md5 = require('md5');
module.exports = md5('hello');
"""
})
]
);
var ret = script.run("test.js");
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For supporting npm pack, you can import it via a asar file.
Auto convert #
Any dart object could be auto convert to JS object.
JsValue func = script.eval("""
(function (func, map) {
return func(map["test"])
})
""");
test("[JS] test auto convert ", func.call([(content) {
return content;
}, {"test": 26}]) == 26);
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