luavm 0.0.1

Provide simple Lua VM to Flutter

example/lib/main.dart

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)),
      ),
    );
  }
}