初始提交，未完全测试

template/stat/ast/Stat.py

@@ -0,0 +1,79 @@
+#!/usr/bin/env python3.9
+# -*- coding: utf-8 -*-
+"""
+JFinal Stat - Abstract Syntax Tree Base Class
+"""
+
+from typing import Any
+from ..Scope import Scope
+from ...Env import Env
+
+class Stat:
+    """Base class for statement AST nodes"""
+    
+    def exec(self, env: Env, scope: Scope, writer) -> Any:
+        """
+        Execute the statement
+        
+        Args:
+            env: Template environment
+            scope: Execution scope
+            writer: Output writer
+            
+        Returns:
+            Execution result
+        """
+        raise NotImplementedError("Stat.exec() must be implemented by subclasses")
+    
+    def get_stat_list(self) -> 'StatList':
+        """Get as StatList if applicable"""
+        return None
+    
+    def __repr__(self) -> str:
+        return f"Stat({self.__class__.__name__})"
+
+
+class StatList(Stat):
+    """Statement list containing multiple statements"""
+    
+    def __init__(self):
+        """Initialize statement list"""
+        self._stats: list = []
+    
+    def add_stat(self, stat: Stat):
+        """
+        Add statement to list
+        
+        Args:
+            stat: Statement to add
+        """
+        if stat:
+            self._stats.append(stat)
+    
+    def exec(self, env: Env, scope: Scope, writer) -> Any:
+        """
+        Execute all statements in list
+        
+        Args:
+            env: Template environment
+            scope: Execution scope
+            writer: Output writer
+            
+        Returns:
+            Last statement result or None
+        """
+        result = None
+        for stat in self._stats:
+            result = stat.exec(env, scope, writer)
+        return result
+    
+    def get_stats(self) -> list:
+        """Get all statements"""
+        return self._stats.copy()
+    
+    def __len__(self) -> int:
+        """Get number of statements"""
+        return len(self._stats)
+    
+    def __repr__(self) -> str:
+        return f"StatList({len(self._stats)} statements)"