AScript如何实现中文脚本引擎

 1 public class 如果语法处理器 : ITokenHandler
 2 {
 3     private static readonly HashSet<string> _StatementEndTokens = new HashSet<string> { "则", "否则" };
 4 
 5     public void Build(DefaultSyntaxAnalyzer analyzer, TokenAnalyzingArgs e)
 6     {
 7         e.IsHandled = true;
 8         e.End = true;
 9 
10         // 如果前面有语句，则返回
11         if (e.TreeBuilder.Root != null)
12         {
13             e.TokenReader.Push(e.CurrentToken);
14             return;
15         }
16 
17         var condition = analyzer.BuildOneStatement(e.BuildContext, e.ScriptContext, e.Options, e.TokenReader, e.Control, e.Ignore, endTokens: _StatementEndTokens);
18         analyzer.ValidateNextToken(e.TokenReader, "则");
19         var createAllOptions = new BuildOptions(e.Options) { CreateFullTreeNode = true };
20         var body = analyzer.BuildOneStatement(e.BuildContext, e.ScriptContext, createAllOptions, e.TokenReader, e.Control, e.Ignore, endTokens: _StatementEndTokens);
21         var node = new IfNode { Condition = condition, Body = body };
22         var nextToken = e.TokenReader.Read();
23         if (nextToken.HasValue && nextToken.Value.Value == ";")
24         {
25             nextToken = e.TokenReader.Read();
26         }
27         if (nextToken.HasValue)
28         {
29             if (nextToken.Value.Value == "否则")
30             {
31                 node.Else = analyzer.BuildOneStatement(e.BuildContext, e.ScriptContext, createAllOptions, e.TokenReader, e.Control, e.Ignore);
32             }
33             else
34             {
35                 e.TokenReader.Push(nextToken.Value);
36             }
37         }
38         e.TreeBuilder.Add(e.BuildContext, e.ScriptContext, e.Options, e.Control, node);
39     }
40 }