luavm 0.1.1 luavm: ^0.1.1 copied to clipboard
Provide simple Lua VMs to Flutter (now supports vanilla Lua 5.3.5)
import 'package:flutter/material.dart';
import 'dart:async';
import 'package:luavm/luavm.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
final _nameCtrl = TextEditingController(text: 'base');
final _codeCtrl = TextEditingController(text: 'return hi(3),_VERSION,3*4');
String _luaRes = 'Unknown';
bool _luaError = false;
Future<void> runCode() async {
String luaRes;
// Platform messages may fail, so we use a try/catch PlatformException.
try {
final reslist = await Luavm.eval(_nameCtrl.text, _codeCtrl.text);
luaRes = reslist.join("\n");
_luaError = false;
} on LuaError catch (e) {
setState(() {
_luaError = true;
_luaRes = e.toString();
});
}
if (luaRes != null && luaRes.length > 0) {
setState(() {
_luaRes = luaRes;
});
}
// If the widget was removed from the tree while the asynchronous platform
// message was in flight, we want to discard the reply rather than calling
// setState to update our non-existent appearance.
if (!mounted) return;
}
// Platform messages are asynchronous, so we initialize in an async method.
Future<void> opLua(String name) async {
if (Luavm.opened(name)) {
await Luavm.close(name);
} else {
await Luavm.open(name);
await Luavm.eval(name, "function hi(n) return 'hi-$name-'..n end");
}
setState(() {});
}
@override
void dispose() {
_codeCtrl.dispose();
_nameCtrl.dispose();
super.dispose();
}
Widget nameLine() {
String btnTitle = '--';
if (_nameCtrl.text != '' && _nameCtrl.text != null) {
if (Luavm.opened(_nameCtrl.text)) {
btnTitle = 'Close';
} else {
btnTitle = 'Open';
}
}
return Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Expanded(
child: TextField(
controller: _nameCtrl,
autocorrect: false,
onChanged: (_) {
setState(() {});
},
)),
MaterialButton(
onPressed: () async {
await opLua(_nameCtrl.text);
},
child: Text(btnTitle))
],
);
}
@override
Widget build(BuildContext context) {
var style = TextStyle(color: Colors.black);
if (_luaError) {
style = TextStyle(color: Colors.red);
}
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: const Text('Example of LuaVM'),
),
body: Center(
child: Column(children: [
nameLine(),
TextField(controller: _codeCtrl, autocorrect: false),
MaterialButton(
onPressed: () async {
await runCode();
},
child: Text('Run')),
Text(_luaRes, style: style),
], mainAxisAlignment: MainAxisAlignment.spaceEvenly)),
),
);
}
}