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
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
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 }
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