初始提交，未完全测试

template/expr/ast/Expr.py

@@ -0,0 +1,100 @@
+#!/usr/bin/env python3.9
+# -*- coding: utf-8 -*-
+"""
+JFinal Expr - Expression Evaluation Base Class
+"""
+
+from typing import Any
+from ...stat.Scope import Scope
+from ...Env import Env
+
+class Expr:
+    """Base class for expression AST nodes"""
+    
+    def eval(self, scope: Scope) -> Any:
+        """
+        Evaluate expression
+        
+        Args:
+            scope: Execution scope
+            
+        Returns:
+            Expression result
+        """
+        raise NotImplementedError("Expr.eval() must be implemented by subclasses")
+    
+    def eval_expr_list(self, scope: Scope) -> list:
+        """
+        Evaluate as expression list
+        
+        Args:
+            scope: Execution scope
+            
+        Returns:
+            List of expression results
+        """
+        return [self.eval(scope)]
+    
+    def __repr__(self) -> str:
+        return f"Expr({self.__class__.__name__})"
+
+
+class ExprList(Expr):
+    """Expression list containing multiple expressions"""
+    
+    def __init__(self, expressions: list = None):
+        """
+        Initialize expression list
+        
+        Args:
+            expressions: List of expressions
+        """
+        self._expressions = expressions or []
+    
+    def add_expr(self, expr: Expr):
+        """
+        Add expression to list
+        
+        Args:
+            expr: Expression to add
+        """
+        if expr:
+            self._expressions.append(expr)
+    
+    def eval(self, scope: Scope) -> Any:
+        """
+        Evaluate all expressions and return last result
+        
+        Args:
+            scope: Execution scope
+            
+        Returns:
+            Last expression result
+        """
+        result = None
+        for expr in self._expressions:
+            result = expr.eval(scope)
+        return result
+    
+    def eval_expr_list(self, scope: Scope) -> list:
+        """
+        Evaluate all expressions and return list of results
+        
+        Args:
+            scope: Execution scope
+            
+        Returns:
+            List of results
+        """
+        return [expr.eval(scope) for expr in self._expressions]
+    
+    def get_expressions(self) -> list:
+        """Get all expressions"""
+        return self._expressions.copy()
+    
+    def __len__(self) -> int:
+        """Get number of expressions"""
+        return len(self._expressions)
+    
+    def __repr__(self) -> str:
+        return f"ExprList({len(self._expressions)} expressions)"