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修改了脚本执行的一些BUG。

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This commit is contained in:
fengjiayi
2024-12-21 20:47:31 +08:00
parent 6e864a9ae4
commit 0f9c9b9988
19 changed files with 451 additions and 191 deletions
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4
Serein.Script/Node/ClassTypeDefinitionNode.cs
View File

@@ -11,13 +11,15 @@ namespace Serein.Script.Node
/// </summary>
public class ClassTypeDefinitionNode : ASTNode
{
public bool IsOverlay { get; set; }
public string ClassName { get; }
public Dictionary<string, Type> Fields { get; }
public ClassTypeDefinitionNode(Dictionary<string, Type> fields, string className)
public ClassTypeDefinitionNode(Dictionary<string, Type> fields, string className, bool isOverlay)
{
this.Fields = fields;
this.ClassName = className;
IsOverlay = isOverlay;
}
}

227
Serein.Script/SereinScriptInterpreter.cs
View File

@@ -21,8 +21,45 @@ namespace Serein.Script
}
}
/// <summary>
/// 脚本运行上下文
/// </summary>
public interface IScriptInvokeContext
{
/// <summary>
/// 是否该退出了
/// </summary>
bool IsReturn { get; }
public class SereinScriptInterpreter
/// <summary>
/// 是否严格检查 Null 值 （禁止使用 Null）
/// </summary>
bool IsCheckNullValue { get; }
/// <summary>
/// 获取变量的值
/// </summary>
/// <param name="varName"></param>
/// <returns></returns>
object GetVarValue(string varName);
/// <summary>
/// 设置变量的值
/// </summary>
/// <param name="varName"></param>
/// <param name="value"></param>
/// <returns></returns>
bool SetVarValue(string varName, object value);
/// <summary>
/// 结束调用
/// </summary>
/// <returns></returns>
bool Exit();
}
public class ScriptInvokeContext : IScriptInvokeContext
{
/// <summary>
/// 定义的变量
@@ -30,25 +67,37 @@ namespace Serein.Script
private Dictionary<string, object> _variables = new Dictionary<string, object>();
/// <summary>
/// 挂载的函数
/// 是否该退出了
/// </summary>
private static Dictionary<string, DelegateDetails> _functionTable = new Dictionary<string, DelegateDetails>();
public bool IsReturn { get; set; }
/// <summary>
/// 挂载的函数调用的对象（用于函数需要实例才能调用的场景）
/// 是否严格检查 Null 值 （禁止使用 Null）
/// </summary>
private static Dictionary<string, Func<object>> _callFuncOfGetObjects = new Dictionary<string, Func<object>>();
public bool IsCheckNullValue { get; set; }
/// <summary>
/// 定义的类型
/// </summary>
private static Dictionary<string, Type> _classDefinition = new Dictionary<string, Type>();
/// <summary>
/// 重置的变量
/// </summary>
public void ResetVar()
object IScriptInvokeContext.GetVarValue(string varName)
{
_variables.TryGetValue(varName, out var value);
return value;
}
bool IScriptInvokeContext.SetVarValue(string varName, object? value)
{
if (!_variables.TryAdd(varName, value))
{
_variables[varName] = value;
}
return true;
}
bool IScriptInvokeContext.Exit()
{
// 清理脚本中加载的非托管资源
foreach (var nodeObj in _variables.Values)
{
if (nodeObj is not null)
@@ -64,14 +113,47 @@ namespace Serein.Script
}
}
_variables.Clear();
return true ;
}
}
public class SereinScriptInterpreter
{
/// <summary>
/// 挂载的函数
/// </summary>
private static Dictionary<string, DelegateDetails> _functionTable = new Dictionary<string, DelegateDetails>();
/// <summary>
/// 挂载的函数调用的对象（用于函数需要实例才能调用的场景）
/// </summary>
private Dictionary<string, Func<object>> _callFuncOfGetObjects = new Dictionary<string, Func<object>>();
/// <summary>
/// 定义的类型
/// </summary>
private Dictionary<string, Type> _classDefinition = new Dictionary<string, Type>();
/// <summary>
/// 挂载静态函数
/// </summary>
/// <param name="functionName"></param>
/// <param name="methodInfo"></param>
public static void AddStaticFunction(string functionName, MethodInfo methodInfo)
{
_functionTable[functionName] = new DelegateDetails(methodInfo);
}
/// <summary>
/// 挂载函数
/// </summary>
/// <param name="functionName">函数名称</param>
/// <param name="methodInfo">方法信息</param>
public static void AddFunction(string functionName, MethodInfo methodInfo, Func<object>? callObj = null)
public void AddFunction(string functionName, MethodInfo methodInfo, Func<object>? callObj = null)
{
//if (!_functionTable.ContainsKey(functionName))
//{
@@ -84,12 +166,16 @@ namespace Serein.Script
}
if(!methodInfo.IsStatic && callObj is not null)
if(!methodInfo.IsStatic && callObj is not null && !_callFuncOfGetObjects.ContainsKey(functionName))
{
// 静态函数不需要
_callFuncOfGetObjects.Add(functionName, callObj);
}
_functionTable[functionName] = new DelegateDetails(methodInfo);
if (!_functionTable.ContainsKey(functionName))
{
_functionTable[functionName] = new DelegateDetails(methodInfo);
}
//_functionTable[functionName] = new DelegateDetails(methodInfo);
}
/// <summary>
@@ -97,7 +183,7 @@ namespace Serein.Script
/// </summary>
/// <param name="typeName">函数名称</param>
/// <param name="type">方法信息</param>
public static void AddClassType(Type type , string typeName = "")
public void AddClassType(Type type , string typeName = "")
{
if (string.IsNullOrEmpty(typeName))
{
@@ -115,7 +201,7 @@ namespace Serein.Script
/// </summary>
/// <param name="programNode"></param>
/// <returns></returns>
private async Task<object?> ExecutionProgramNodeAsync(ProgramNode programNode)
private async Task<object?> ExecutionProgramNodeAsync(IScriptInvokeContext context, ProgramNode programNode)
{
// 遍历 ProgramNode 中的所有语句并执行它们
foreach (var statement in programNode.Statements)
@@ -123,11 +209,11 @@ namespace Serein.Script
// 直接退出
if (statement is ReturnNode returnNode) // 遇到 Return 语句 提前退出
{
return await EvaluateAsync(statement);
return await EvaluateAsync(context, statement);
}
else
{
await InterpretAsync(statement);
await InterpretAsync(context, statement);
}
}
@@ -141,12 +227,16 @@ namespace Serein.Script
/// <returns></returns>
private void ExecutionClassTypeDefinitionNode(ClassTypeDefinitionNode classTypeDefinitionNode)
{
if (_classDefinition.ContainsKey(classTypeDefinitionNode.ClassName))
if (_classDefinition.ContainsKey(classTypeDefinitionNode.ClassName) && !classTypeDefinitionNode.IsOverlay)
{
//SereinEnv.WriteLine(InfoType.WARN, $"异常信息 : 类型重复定义，代码在第{classTypeDefinitionNode.Row}行: {classTypeDefinitionNode.Code.Trim()}");
return;
}
var type = DynamicObjectHelper.CreateTypeWithProperties(classTypeDefinitionNode.Fields, classTypeDefinitionNode.ClassName);
var isOverlay = true; // classTypeDefinitionNode.IsOverlay;
var type = DynamicObjectHelper.CreateTypeWithProperties(classTypeDefinitionNode.Fields, classTypeDefinitionNode.ClassName, isOverlay); // 覆盖
classTypeDefinitionNode.IsOverlay = false; // 已经加载过，则不再覆盖
_classDefinition[classTypeDefinitionNode.ClassName] = type; // 定义对象
}
@@ -156,9 +246,9 @@ namespace Serein.Script
/// <param name="ifNode"></param>
/// <returns></returns>
/// <exception cref="Exception"></exception>
private async Task ExecutionIfNodeAsync(IfNode ifNode)
private async Task ExecutionIfNodeAsync(IScriptInvokeContext context, IfNode ifNode)
{
var result = await EvaluateAsync(ifNode.Condition) ?? throw new SereinSciptException(ifNode, $"条件语句返回了 null");
var result = await EvaluateAsync(context, ifNode.Condition) ?? throw new SereinSciptException(ifNode, $"条件语句返回了 null");
if (result is not bool condition)
{
@@ -169,14 +259,14 @@ namespace Serein.Script
{
foreach (var trueNode in ifNode.TrueBranch)
{
await InterpretAsync(trueNode);
await InterpretAsync(context, trueNode);
}
}
else
{
foreach (var falseNode in ifNode.FalseBranch)
{
await InterpretAsync(falseNode);
await InterpretAsync(context,falseNode);
}
}
}
@@ -187,11 +277,11 @@ namespace Serein.Script
/// <param name="whileNode"></param>
/// <returns></returns>
/// <exception cref="Exception"></exception>
private async Task ExectutionWhileNodeAsync(WhileNode whileNode)
private async Task ExectutionWhileNodeAsync(IScriptInvokeContext context, WhileNode whileNode)
{
while (true)
{
var result = await EvaluateAsync(whileNode.Condition) ?? throw new SereinSciptException(whileNode, $"条件语句返回了 null");
var result = await EvaluateAsync(context, whileNode.Condition) ?? throw new SereinSciptException(whileNode, $"条件语句返回了 null");
if (result is not bool condition)
{
throw new SereinSciptException(whileNode, $"条件语句返回值不为 bool 类型（当前返回值类型为 {result.GetType()})");
@@ -202,7 +292,7 @@ namespace Serein.Script
}
foreach(var node in whileNode.Body)
{
await InterpretAsync(node);
await InterpretAsync(context, node);
}
}
}
@@ -212,19 +302,19 @@ namespace Serein.Script
/// </summary>
/// <param name="assignmentNode"></param>
/// <returns></returns>
private async Task ExecutionAssignmentNodeAsync(AssignmentNode assignmentNode)
private async Task ExecutionAssignmentNodeAsync(IScriptInvokeContext context, AssignmentNode assignmentNode)
{
var tmp = await EvaluateAsync(assignmentNode.Value);
_variables[assignmentNode.Variable] = tmp;
var tmp = await EvaluateAsync(context, assignmentNode.Value);
context.SetVarValue(assignmentNode.Variable, tmp);
}
private async Task<object> InterpretFunctionCallAsync(FunctionCallNode functionCallNode)
private async Task<object> InterpretFunctionCallAsync(IScriptInvokeContext context, FunctionCallNode functionCallNode)
{
// 评估函数参数
var arguments = new object?[functionCallNode.Arguments.Count];
for (int i = 0; i < functionCallNode.Arguments.Count; i++)
{
ASTNode? arg = functionCallNode.Arguments[i];
arguments[i] = await EvaluateAsync(arg); // 评估每个参数
arguments[i] = await EvaluateAsync(context, arg); // 评估每个参数
}
var funcName = functionCallNode.FunctionName;
@@ -263,7 +353,7 @@ namespace Serein.Script
public async Task<object?> InterpretAsync(ASTNode node)
public async Task<object?> InterpretAsync(IScriptInvokeContext context, ASTNode node)
{
if(node == null)
{
@@ -273,30 +363,29 @@ namespace Serein.Script
switch (node)
{
case ProgramNode programNode: // AST树入口
var scritResult = await ExecutionProgramNodeAsync(programNode);
var scritResult = await ExecutionProgramNodeAsync(context, programNode);
return scritResult; // 遍历 ProgramNode 中的所有语句并执行它们
case ClassTypeDefinitionNode classTypeDefinitionNode: // 定义类型
ExecutionClassTypeDefinitionNode(classTypeDefinitionNode);
break;
case AssignmentNode assignment: // 出现在 = 右侧的表达式
await ExecutionAssignmentNodeAsync(assignment);
await ExecutionAssignmentNodeAsync(context, assignment);
break;
case MemberAssignmentNode memberAssignmentNode: // 设置对象属性
await SetMemberValue(memberAssignmentNode);
await SetMemberValue(context, memberAssignmentNode);
break;
case MemberFunctionCallNode memberFunctionCallNode:
return await CallMemberFunction(memberFunctionCallNode);
break;
return await CallMemberFunction(context, memberFunctionCallNode);
case IfNode ifNode: // 执行 if...else... 语句块
await ExecutionIfNodeAsync(ifNode);
await ExecutionIfNodeAsync(context, ifNode);
break;
case WhileNode whileNode: // 循环语句块
await ExectutionWhileNodeAsync(whileNode);
await ExectutionWhileNodeAsync(context, whileNode);
break;
case FunctionCallNode functionCallNode: // 方法调用节点
return await InterpretFunctionCallAsync(functionCallNode);
return await InterpretFunctionCallAsync(context, functionCallNode);
case ReturnNode returnNode:
return await EvaluateAsync(returnNode);
return await EvaluateAsync(context, returnNode);
default:
throw new SereinSciptException(node, "解释器 InterpretAsync() 未实现节点行为");
}
@@ -304,7 +393,7 @@ namespace Serein.Script
}
private async Task<object?> EvaluateAsync(ASTNode node)
private async Task<object?> EvaluateAsync(IScriptInvokeContext context, ASTNode node)
{
if(node == null)
{
@@ -321,27 +410,17 @@ namespace Serein.Script
case StringNode stringNode:
return stringNode.Value; // 返回字符串值
case IdentifierNode identifierNode:
if (_variables.TryGetValue(identifierNode.Name, out var result))
{
//if(result == null)
//{
// throw new SereinSciptException(identifierNode, "尝试使用值为null的变量");
//}
return result; // 获取变量值
}
else
{
throw new SereinSciptException(identifierNode, "尝试使用未声明的变量");
}
return context.GetVarValue(identifierNode.Name);
//throw new SereinSciptException(identifierNode, "尝试使用值为null的变量");
//throw new SereinSciptException(identifierNode, "尝试使用未声明的变量");
case BinaryOperationNode binOpNode:
// 递归计算二元操作
var left = await EvaluateAsync(binOpNode.Left);
var left = await EvaluateAsync(context, binOpNode.Left);
//if (left == null )
//{
// throw new SereinSciptException(binOpNode.Left, $"左值尝试使用 null");
//}
var right = await EvaluateAsync(binOpNode.Right);
var right = await EvaluateAsync(context, binOpNode.Right);
//if (right == null)
//{
// throw new SereinSciptException(binOpNode.Right, "右值尝试使用计算 null");
@@ -354,7 +433,7 @@ namespace Serein.Script
for (int i = 0; i < objectInstantiationNode.Arguments.Count; i++)
{
var argNode = objectInstantiationNode.Arguments[i];
args[i] = await EvaluateAsync(argNode);
args[i] = await EvaluateAsync(context, argNode);
}
var obj = Activator.CreateInstance(type,args: args);// 创建对象
if (obj == null)
@@ -370,11 +449,13 @@ namespace Serein.Script
}
case FunctionCallNode callNode:
return await InterpretFunctionCallAsync(callNode); // 调用方法返回函数的返回值
return await InterpretFunctionCallAsync(context, callNode); // 调用方法返回函数的返回值
case MemberFunctionCallNode memberFunctionCallNode:
return await CallMemberFunction(context, memberFunctionCallNode);
case MemberAccessNode memberAccessNode:
return await GetValue(memberAccessNode);
return await GetValue(context, memberAccessNode);
case ReturnNode returnNode: //
return await EvaluateAsync(returnNode.Value); // 直接返回响应的内容
return await EvaluateAsync(context, returnNode.Value); // 直接返回响应的内容
default:
throw new SereinSciptException(node, "解释器 EvaluateAsync() 未实现节点行为");
}
@@ -440,10 +521,10 @@ namespace Serein.Script
/// <param name="memberAssignmentNode"></param>
/// <returns></returns>
/// <exception cref="SereinSciptException"></exception>
public async Task SetMemberValue(MemberAssignmentNode memberAssignmentNode)
public async Task SetMemberValue(IScriptInvokeContext context, MemberAssignmentNode memberAssignmentNode)
{
var target = await EvaluateAsync(memberAssignmentNode.Object);
var value = await EvaluateAsync(memberAssignmentNode.Value);
var target = await EvaluateAsync(context, memberAssignmentNode.Object);
var value = await EvaluateAsync(context, memberAssignmentNode.Value);
// 设置值
var lastMember = memberAssignmentNode.MemberName;
@@ -474,9 +555,9 @@ namespace Serein.Script
/// <param name="memberAccessNode"></param>
/// <returns></returns>
/// <exception cref="SereinSciptException"></exception>
public async Task<object?> GetValue(MemberAccessNode memberAccessNode)
public async Task<object?> GetValue(IScriptInvokeContext context, MemberAccessNode memberAccessNode)
{
var target = await EvaluateAsync(memberAccessNode.Object);
var target = await EvaluateAsync(context, memberAccessNode.Object);
var lastMember = memberAccessNode.MemberName;
var lastProperty = target?.GetType().GetProperty(lastMember);
@@ -503,9 +584,9 @@ namespace Serein.Script
/// </summary>
private Dictionary<string, DelegateDetails> MethodToDelegateCaches { get; } = new Dictionary<string, DelegateDetails>();
public async Task<object?> CallMemberFunction(MemberFunctionCallNode memberFunctionCallNode)
public async Task<object?> CallMemberFunction(IScriptInvokeContext context, MemberFunctionCallNode memberFunctionCallNode)
{
var target = await EvaluateAsync(memberFunctionCallNode.Object);
var target = await EvaluateAsync(context, memberFunctionCallNode.Object);
var lastMember = memberFunctionCallNode.FunctionName;
var methodInfo = target?.GetType().GetMethod(lastMember) ?? throw new SereinSciptException(memberFunctionCallNode, $"对象没有方法\"{memberFunctionCallNode.FunctionName}\"");
@@ -521,7 +602,7 @@ namespace Serein.Script
for (int i = 0; i < memberFunctionCallNode.Arguments.Count; i++)
{
ASTNode? arg = memberFunctionCallNode.Arguments[i];
arguments[i] = await EvaluateAsync(arg); // 评估每个参数
arguments[i] = await EvaluateAsync(context, arg); // 评估每个参数
}
return await delegateDetails.InvokeAsync(target, arguments);

7
Serein.Script/SereinScriptLexer.cs
View File

@@ -27,6 +27,10 @@ namespace Serein.Script
/// </summary>
String,
/// <summary>
/// 插值字符串
/// </summary>
InterpolatedString,
/// <summary>
/// 关键字
/// </summary>
Keyword,
@@ -273,6 +277,9 @@ namespace Serein.Script
}
case '.':
return CreateToken(TokenType.Dot, ".");
//case '$':
// return CreateToken(TokenType.InterpolatedString, "$");
}
throw new Exception("Unexpected character: " + currentChar);

116
Serein.Script/SereinScriptParser.cs
View File

@@ -3,6 +3,7 @@ using Serein.Library;
using Serein.Script.Node;
using System.Collections.Generic;
using System.Linq.Expressions;
using System.Reflection;
namespace Serein.Script
{
@@ -32,6 +33,7 @@ namespace Serein.Script
Statements.Clear();
while (_currentToken.Type != TokenType.EOF)
{
var astNode = Statement();
if (astNode == null)
{
@@ -41,8 +43,7 @@ namespace Serein.Script
//if (astNode is ClassTypeDefinitionNode)
//{
// // 类型定义置顶
// statements = [astNode, ..statements];
// statements = [astNode, ..statements]; // 类型定义置顶
//}
//else
//{
@@ -61,9 +62,17 @@ namespace Serein.Script
}
if (_currentToken.Type == TokenType.Keyword && _currentToken.Value == "class")
{
return ParseClassDefinition();
return ParseClassDefinition(); // 加载类，如果已经加载过，则忽略
}
if (_currentToken.Type == TokenType.Keyword && _currentToken.Value == "new")
{
var _peekToken = _lexer.PeekToken();
if (_peekToken.Type == TokenType.Keyword && _peekToken.Value == "class")
{
return ParseClassDefinition(); // 重新加载类
}
}
if (_currentToken.Type == TokenType.Keyword && _currentToken.Value == "if")
{
return ParseIf();
@@ -134,20 +143,30 @@ namespace Serein.Script
private ASTNode ParseAssignment()
{
string variableName = _currentToken.Value.ToString();
_currentToken = _lexer.NextToken(); // consume identifier
if(_currentToken.Type == TokenType.ParenthesisRight)
var _peekToken = _lexer.PeekToken();
if (_peekToken.Type == TokenType.ParenthesisRight)
{
_currentToken = _lexer.NextToken(); // 消耗标识符
return new IdentifierNode(variableName).SetTokenInfo(_currentToken);
}
if(_currentToken.Type == TokenType.Operator && _currentToken.Value == "=")
if(_peekToken.Type == TokenType.Operator && _peekToken.Value == "=")
{
// 赋值行为
_currentToken = _lexer.NextToken(); // consume "="
_currentToken = _lexer.NextToken(); // 消耗标识符
_currentToken = _lexer.NextToken(); // 消耗 "="
var _tempToken = _lexer.PeekToken();
ASTNode valueNode;
if (_tempToken.Type == TokenType.ParenthesisLeft)
if(_tempToken.Type == TokenType.Operator && _tempToken.Value != "=")
{
//_currentToken = _lexer.NextToken(); // 消耗操作符
//_currentToken = _lexer.NextToken(); // 消耗操作符
valueNode = Expression();
}
else if (_tempToken.Type == TokenType.ParenthesisLeft)
{
// 解析赋值右边的表达式
// 是函数调用，解析函数调用
@@ -160,10 +179,16 @@ namespace Serein.Script
}
return new AssignmentNode(variableName, valueNode).SetTokenInfo(_currentToken);
}
if (_currentToken.Type == TokenType.Dot)
if (_peekToken.Type == TokenType.Dot)
{
// 可能是方法调用
return ParseMemberAccessOrAssignment();
}
if(_peekToken.Type == TokenType.Operator)
{
return new IdentifierNode(variableName).SetTokenInfo(_currentToken);
}
@@ -204,13 +229,19 @@ namespace Serein.Script
private ASTNode ParseClassDefinition()
{
bool isOverlay = false;
if (_currentToken.Value == "new")
{
isOverlay = true; // 重新加载类
_currentToken = _lexer.NextToken(); // 消耗 new 关键字
}
_currentToken = _lexer.NextToken(); // 消耗 class 关键字
var className = _currentToken.Value.ToString(); // 获取定义的类名
_currentToken = _lexer.NextToken(); // 消耗括号
_currentToken = _lexer.NextToken(); // 消耗类名
if (_currentToken.Type != TokenType.BraceLeft || _currentToken.Value != "{")
throw new Exception("Expected '{' after class definition");
var classFields = new Dictionary<string, Type>();
_currentToken = _lexer.NextToken();
_currentToken = _lexer.NextToken(); // 消耗括号
while (_currentToken.Type != TokenType.BraceRight)
{
var fieldType = _currentToken.Value.ToString().ToTypeOfString(); // 获取定义的类名
@@ -231,7 +262,7 @@ namespace Serein.Script
_currentToken = _lexer.NextToken();
_currentToken = _lexer.NextToken();
return new ClassTypeDefinitionNode(classFields, className).SetTokenInfo(_currentToken);
return new ClassTypeDefinitionNode(classFields, className, isOverlay).SetTokenInfo(_currentToken);
}
public ASTNode ParseObjectInstantiation()
@@ -310,7 +341,6 @@ namespace Serein.Script
else
{
if(_peekToken.Type == TokenType.ParenthesisLeft)
{
// 成员方法调用 obj.Member(xxx);
@@ -323,6 +353,8 @@ namespace Serein.Script
}
else
{
_currentToken = _lexer.NextToken(); // 消耗 成员名称
// 成员获取
return new MemberAccessNode(identifierNode, memberName).SetTokenInfo(_currentToken);
}
@@ -361,7 +393,7 @@ namespace Serein.Script
}
}
_currentToken = _lexer.NextToken(); // consume ")"
//_currentToken = _lexer.NextToken(); // consume ")"
return new MemberFunctionCallNode(targetNode, functionName, arguments).SetTokenInfo(_currentToken);
}
@@ -548,6 +580,15 @@ namespace Serein.Script
_currentToken = _lexer.NextToken(); // 消耗数字
return new StringNode(text.ToString()).SetTokenInfo(_currentToken);
}
if( _currentToken.Type == TokenType.InterpolatedString)
{
// 可能是插值字符串；
// let context = $"a{A}b{B}c";
// let context = "a" + A + "b" + B + c;
_currentToken = _lexer.NextToken(); // 消耗字符串
while (_currentToken.Type == TokenType.String) {
}
}
if (_currentToken.Type == TokenType.Number)
{
@@ -589,51 +630,6 @@ namespace Serein.Script
if (_identifierPeekToken.Type == TokenType.Dot)
{
return ParseMemberAccessOrAssignment();
var identifierNode = new IdentifierNode(identifier).SetTokenInfo(_currentToken);
// 处理成员访问：identifier.member
if (_currentToken.Type == TokenType.Dot)
{
_currentToken = _lexer.NextToken(); // 消耗 "."
if (_currentToken.Type != TokenType.Identifier)
{
throw new Exception("Expected member name after dot.");
}
var memberName = _currentToken.Value;
_currentToken = _lexer.NextToken(); // 消耗成员名
if (_currentToken.Type == TokenType.Operator && _currentToken.Value == "=")
{
// 成员赋值 obj.Member = xxx;
_currentToken = _lexer.NextToken(); // 消耗 "="
var valueNode = Expression(); // 解析右值
return new MemberAssignmentNode(identifierNode, memberName, valueNode).SetTokenInfo(_currentToken);
}
else
{
var _peekToken = _lexer.PeekToken();
if (_peekToken.Type == TokenType.ParenthesisLeft)
{
// 成员方法调用 obj.Member(xxx);
return ParseFunctionCall();
}
else if (_peekToken.Type == TokenType.SquareBracketsLeft)
{
// 数组 index; 字典 key obj.Member[xxx];
return ParseCollectionIndex();
}
else
{
// 成员获取
return new MemberAccessNode(identifierNode, memberName).SetTokenInfo(_currentToken);
}
}
}
return identifierNode;
}
_currentToken = _lexer.NextToken(); // 消耗标识符
return new IdentifierNode(identifier.ToString()).SetTokenInfo(_currentToken);