AScript异步执行与await关键字

1 var script = new Script();
2 // 100毫秒超时
3 var cts = new CancellationTokenSource(100);
4 // 异步读取脚本文件，异步解析脚本，异步执行脚本，如果超时100毫秒则报OperationCanceledException异常
5 var result = await script.EvalAsync(File.OpenRead("mycode.txt"), cancellationToken: cts.Token);
6 Console.WriteLine($"value:{result.Value}, type:{result.Type}");

 1 Func<int, int, Task<int>> sum = async (a, b) =>
 2 {
 3     await Task.Delay(1000);
 4     return a + b;
 5 };
 6 string s = @"
 7 var a = await sum(5, 10);
 8 await Task.Delay(500);
 9 a + 20
10 ";
11 var script = new Script();
12 script.Context.AddFunc("sum", sum);
13 // 异步执行
14 var result = await script.EvalAsync(s);
15 Assert.AreEqual(35, result.Value);
16 Assert.AreEqual(typeof(int), result.Type);
17 // 同步执行，等效于：var a = sum(5, 10).Result; Task.Delay(500).Wait(); a + 20
18 Assert.AreEqual(35, script.Eval(s));

1 var script = new Script();
2 // 100毫秒超时
3 var cts = new CancellationTokenSource(100);
4 await Assert.ThrowsExceptionAsync<TaskCanceledException>(async () =>
5 {
6     await script.EvalAsync("await Task.Delay(1000, @@CancellationToken)", cancellationToken: cts.Token);
7 });

 1 public class CancellationTokenHandler : ITokenHandler, IAsyncTokenHandler
 2 {
 3     public static readonly CancellationTokenHandler Instance = new CancellationTokenHandler();
 4 
 5     public void Build(DefaultSyntaxAnalyzer analyzer, TokenAnalyzingArgs e)
 6     {
 7         e.IsHandled = true;
 8         if (!e.Ignore)
 9         {
10             e.TreeBuilder.AddData(e.BuildContext, e.ScriptContext, e.Options, e.Control, CancellationToken.None);
11         }
12     }
13 
14     public async Task BuildAsync(DefaultSyntaxAnalyzer analyzer, TokenAnalyzingArgs e, CancellationToken cancellationToken)
15     {
16         e.IsHandled = true;
17         if (!e.Ignore)
18         {
19             e.TreeBuilder.AddData(e.BuildContext, e.ScriptContext, e.Options, e.Control, cancellationToken);
20         }
21     }
22 }