添加对while-do语句的支持 (#77)

Co-authored-by: jackfiled <xcrenchangjun@outlook.com>
Reviewed-on: PostGuard/Canon#77
Co-authored-by: ichirinko <1621543655@qq.com>
Co-committed-by: ichirinko <1621543655@qq.com>

Canon.Core/SyntaxNodes/Expression.cs

@@ -48,6 +48,11 @@ public class Expression : NonTerminatedSyntaxNode
     /// </summary>
     public bool IsIfCondition { get; set; }
 
+    /// <summary>
+    /// 是否为WHILE语句中的条件语句
+    /// </summary>
+    public bool IsWhileCondition { get; set; }
+
     /// <summary>
     /// 直接赋值产生式的事件
     /// </summary>

Canon.Core/SyntaxNodes/Statement.cs

@@ -29,6 +29,17 @@ public class ForGeneratorEventArgs : EventArgs
     public required Expression End { get; init; }
 
     public required Statement Sentence { get; init; }
+
+    public required TerminatedSyntaxNode Do { get; init; }
+}
+
+public class WhileGeneratorEventArgs : EventArgs
+{
+    public required Expression Condition { get; init; }
+
+    public required Statement Sentence { get; init; }
+
+    public required TerminatedSyntaxNode Do { get; init; }
 }
 
 public class Statement : NonTerminatedSyntaxNode
@@ -62,6 +73,11 @@ public class Statement : NonTerminatedSyntaxNode
     /// </summary>
     public event EventHandler<ForGeneratorEventArgs>? OnForGenerator;
 
+    /// <summary>
+    /// 使用While产生式的事件
+    /// </summary>
+    public event EventHandler<WhileGeneratorEventArgs>? OnWhileGenerator;
+
     public static Statement Create(List<SyntaxNodeBase> children)
     {
         return new Statement { Children = children };
@@ -77,6 +93,16 @@ public class Statement : NonTerminatedSyntaxNode
                     Variable = Children[0].Convert<Variable>(), Expression = Children[2].Convert<Expression>()
                 });
         }
+        else if (Children.Count == 4)
+        {
+            OnWhileGenerator?.Invoke(this,
+                new WhileGeneratorEventArgs
+                {
+                    Condition = Children[1].Convert<Expression>(),
+                    Do = Children[2].Convert<TerminatedSyntaxNode>(),
+                    Sentence = Children[3].Convert<Statement>(),
+                });
+        }
         else if (Children.Count == 5)
         {
             OnIfGenerator?.Invoke(this,
@@ -95,6 +121,7 @@ public class Statement : NonTerminatedSyntaxNode
                     Iterator = Children[1].Convert<TerminatedSyntaxNode>().Token.Convert<IdentifierSemanticToken>(),
                     Begin = Children[3].Convert<Expression>(),
                     End = Children[5].Convert<Expression>(),
+                    Do = Children[6].Convert<TerminatedSyntaxNode>(),
                     Sentence = Children[7].Convert<Statement>()
                 });
         }

Canon.Core/SyntaxNodes/TerminatedSyntaxNode.cs

@@ -7,6 +7,16 @@ public class TerminatedSyntaxNode : SyntaxNodeBase
 {
     public override bool IsTerminated => true;
 
+    /// <summary>
+    /// 是否为For循环定义中的DO节点
+    /// </summary>
+    public bool IsForNode { get; set; }
+
+    /// <summary>
+    /// 是否为While循环定义中的DO节点
+    /// </summary>
+    public bool IsWhileNode { get; set; }
+
     public override void PreVisit(SyntaxNodeVisitor visitor)
     {
         visitor.PreVisit(this);