mirror of
https://gitee.com/langsisi_admin/serein-flow
synced 2026-03-02 15:50:47 +08:00
1168 lines
51 KiB
C#
1168 lines
51 KiB
C#
using Serein.Library.Utils;
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using Serein.Script.Node;
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using Serein.Script.Node.FlowControl;
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namespace Serein.Script
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{
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/// <summary>
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/// SereinScriptParser 用于解析 Serein 脚本语言的语法。
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/// </summary>
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public ref struct SereinScriptParser
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{
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private SereinScriptLexer _lexer;
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private Token _currentToken;
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public SereinScriptParser()
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{
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}
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/// <summary>
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/// 解析脚本并返回 AST（抽象语法树）根节点。
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/// </summary>
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/// <returns></returns>
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public ProgramNode Parse(string script)
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{
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_lexer = new SereinScriptLexer(script); // 语法分析
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_currentToken = _lexer.NextToken();
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return Program();
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}
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private List<ASTNode> Statements { get; } = new List<ASTNode>();
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/// <summary>
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/// 解析整个程序，直到遇到文件结尾（EOF）为止。
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/// </summary>
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/// <returns></returns>
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private ProgramNode Program()
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{
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Statements.Clear();
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while (_currentToken.Type != TokenType.EOF)
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{
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var astNode = Statement(); // 解析单个语句
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if (astNode == null)
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{
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continue;
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}
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Statements.Add(astNode); // 将解析得到的 AST 节点添加到语句列表中
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}
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var programNode = new ProgramNode(Statements);
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programNode.SetTokenInfo(_currentToken); // 程序节点，包含所有解析的语句列表
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return programNode;
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/*if (astNode is ClassTypeDefinitionNode)
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{
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statements = [astNode, ..statements]; // 类型定义置顶
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}
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else
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{
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statements.Add(astNode);
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}*/
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}
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private ASTNode Statement()
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{
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if (_currentToken.Type == TokenType.Semicolon)
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{
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NextToken(); // 消耗 ";"
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return null;
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}
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if (_currentToken.Type == TokenType.Identifier)
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{
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/* 赋值语句与一般语句的表达形式
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1. 赋值语句：
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目标对象 表达式获取
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Target() | = | Expression() |
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| = | variable; | (变量）
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| = | value; | 显式设置的字面量。
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| = | obj.Value...; | obj为之前的上下文中出现过的变量，调用表达式包含对象成员数组、方法
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| = | array[...]; | array为之前的上下文中出现过的变量。
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| = | array[...].Value...; | array为之前的上下文中出现过的变量。调用表达式包含对象成员数组、方法
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| = | new Class(...); | 实例化类型，包含构造函数
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补充：Target() 可能的成员
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1. variable
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2. obj.Value...
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3. array[index]
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4. array[index].Value...
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2. 一般语句（方法调用）：
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1. localFunc(...);
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2. obj....Func(...);
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3. array[]....Func(...);
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*/
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#region 分析是赋值语句还是一般语句。赋值语句中间存在 = 操作符，一般语句不存在。
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var backupToken = _currentToken; // 保存当前token
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var peekCount = 0; // peek次数
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var isAssignment = false; // 指示操作类型，true代表赋值语句，false代表一般语句
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while (true)
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{
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// 分析阶段，不移动token
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var peekToken = _lexer.PeekToken(peekCount++); // 预览下一个节点
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if (peekToken.Type == TokenType.Semicolon) break; // 遇到分号，结束词法分析
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if (JudgmentOperator(peekToken, "="))
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{
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isAssignment = true;
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break;
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}
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if(peekCount > 19999)
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{
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throw new Exception("解析异常，peek次数过多，请减少脚本代码");
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}
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}
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#endregion
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#region 生成赋值语句/一般语句的ASTNode
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if (isAssignment)
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{
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// 以赋值语句的形式进行处理
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var assignmentNode = ParseAssignmentNode(); // 解析复制表达式
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NextToken();// 消耗 ";"
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return assignmentNode;
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}
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else
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{
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// 以一般语句的形式进行处理，可当作表达式进行解析
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var targetNode = ParserExpression();
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NextToken();// 消耗 ";"
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return targetNode;
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}
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#endregion
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}
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else if (JudgmentKeyword("class")) // 定义对象
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{
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var classDefinitionNode = ParseClassDefinitionNode();
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return classDefinitionNode;
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}
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else if (JudgmentKeyword("return")) // 返回语句
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{
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var returnNode = ParseReturnNode();
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return returnNode;
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}
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else if (_currentToken.Type == TokenType.Keyword) // 语句块
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{
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/*
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可能的关键字
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1. if()...else...
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2. while(){...}
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*/
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if (JudgmentKeyword("if"))
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{
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return ParseIf();
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}
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else if (JudgmentKeyword("while"))
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{
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return ParseWhile();
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}
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}
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throw new Exception($"解析异常。{_currentToken.ToString()}");
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/*else
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{
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// 为避免解析异常，除了 Statement() 方法以外，其它地方不需要对 TokenType.Semicolon 进行处理
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throw new Exception("解析异常， Statement() 方法以外的地方处理了 TokenType.Semicolon ");
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}*/
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}
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/// <summary>
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/// 解析赋值语句
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/// </summary>
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/// <returns></returns>
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public ASTNode ParseAssignmentNode()
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{
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/* 解析赋值语句
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赋值语句：
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目标对象 表达式获取
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Target() | = | Expression() |
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| = | variable; | (变量）
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| = | value; | 显式设置的字面量。
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| = | obj.Value...; | obj为之前的上下文中出现过的变量，调用表达式包含对象成员数组、方法
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| = | array[...]; | array为之前的上下文中出现过的变量。
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| = | array[...].Value...; | array为之前的上下文中出现过的变量。调用表达式包含对象成员数组、方法
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| = | new Class(...); | 实例化类型，包含构造函数
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| = | [v1, v2, v3]; | 定义数组
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补充：Target() 可能的成员
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1. variable
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2. obj.Value...
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3. array[index]
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4. array[index].Value...
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循环获取token判断
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如果是 "." ，代表需要从对象中获取成员（属性、方法调用、数组）
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如果是 "(" ，代表调用挂载的本地方法
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如果是 "[" ，代表需要获取数组索引
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如果是 "=" ，代表是变量赋值，退出循环
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*/
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/* 获取成员的方式有三种：
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* 1. 获取成员 => PeekToken.Type = TokenType.Dot
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* 2. 获取集合 => PeekToken.Type = TokenType.SquareBracketsLeft
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* 3. 调用成员方法 => PeekToken.Type = TokenType.ParenthesisLeft
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*
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* */
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//if (JudgmentOperator(_currentToken, "=")) break; // 退出
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//var tempPeekToken = _lexer.PeekToken();
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var backupToken = _currentToken;
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var targetNode = new IdentifierNode(_currentToken.Value).SetTokenInfo(_currentToken); // 生成 Tagget 标记节点
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List<ASTNode> nodes = [targetNode];
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ASTNode? source;
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var peekNextToken = _lexer.PeekToken(); // 预览下个标识符
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if (JudgmentOperator(peekNextToken, "="))
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{
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NextToken();
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}
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else
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{
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if (peekNextToken.Type == TokenType.ParenthesisLeft)
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{
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// 解析调用挂载方法
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// ... = variable()()();
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// 暂时不支持柯里化调用... = variable()()();
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var functionCallNode = ParseFunctionCallNode();
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if (_currentToken.Type == TokenType.Semicolon)
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{
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return functionCallNode;
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}
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targetNode = functionCallNode;
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}
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else if (peekNextToken.Type == TokenType.SquareBracketsLeft)
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{
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// 解析集合获取
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var collectionIndexNode = ParseCollectionIndexNode(targetNode);
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if (_currentToken.Type == TokenType.Semicolon)
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{
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return collectionIndexNode;
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}
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targetNode = collectionIndexNode;
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}
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else if (peekNextToken.Type == TokenType.Dot)
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{
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NextToken();
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}
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nodes = [targetNode];
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// 开始解析
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while (true)
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{
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if (JudgmentOperator(_currentToken, "=")) break; // 退出
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var peekToken = _currentToken; // _lexer.PeekToken(); // 获取下一个token开始判断
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source = nodes[^1]; // 重定向节点
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if (peekToken.Type == TokenType.Dot) // 从对象获取
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{
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/*
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* 获取成员的方式有三种：
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* 1. 获取成员 => PeekToken.Type = TokenType.Dot
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* 2. 获取集合 => PeekToken.Type = TokenType.SquareBracketsLeft
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* 3. 调用成员方法 => PeekToken.Type = TokenType.ParenthesisLeft
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*/
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NextToken(); // 消耗 "." 并获取下一个成员。
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var peekToken3 = _lexer.PeekToken();
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if (JudgmentOperator(peekToken3, "="))
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{
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var tempMemberAccessNode = ParseMemberAccessNode(source); // 获取对象中的成员 source.Value...
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nodes.Add(tempMemberAccessNode);
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break;
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}
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ASTNode tempNode = peekToken3.Type switch
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{
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TokenType.Dot or TokenType.Semicolon or TokenType.ParenthesisRight =>
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ParseMemberAccessNode(source), // 获取对象中的成员 source.Value...
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TokenType.SquareBracketsLeft => ParseCollectionIndexNode(source), // 获取集合中的元素 source[index]....
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TokenType.ParenthesisLeft => ParseMemberFunctionCallNode(source), // 获取需要调用的方法 source(arg1,arg2...)...
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_ => throw new Exception($"无法从对象获取成员，当前Token类型为 {peekToken.Type}。")
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};
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nodes.Add(tempNode);
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continue; // 结束当前轮次的token判断
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}
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else if (peekToken.Type == TokenType.ParenthesisLeft) // 调用对象方法
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{
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var memberFunctionCallNode = ParseMemberFunctionCallNode(source);
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nodes.Add(memberFunctionCallNode);
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continue; // 结束当前轮次的token判断
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}
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else if (peekToken.Type == TokenType.SquareBracketsLeft) // 集合获取
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{
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var collectionIndexNode = ParseCollectionIndexNode(source);
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nodes.Add(collectionIndexNode);
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continue; // 结束当前轮次的token判断
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}
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}
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}
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targetNode = nodes[^1];
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if (targetNode is FunctionCallNode or MemberFunctionCallNode)
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{
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throw new Exception($"赋值语句左值部分不允许为方法调用,{targetNode.Code}");
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}
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else
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{
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// 反转赋值。
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NextToken(); // 消耗 "=" 并获取赋值语句的右值表达式。
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ASTNode valueNode = ParserExpression();
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if (targetNode is MemberAccessNode memberAccessNode)
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{
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MemberAssignmentNode memberAssignmentNode = new MemberAssignmentNode(memberAccessNode.Object, memberAccessNode.MemberName, valueNode);
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return memberAssignmentNode;
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}
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else if (targetNode is CollectionIndexNode collectionIndeNode)
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{
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CollectionAssignmentNode collectionAssignmentNode = new CollectionAssignmentNode(collectionIndeNode, valueNode);
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return collectionAssignmentNode;
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}
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else
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{
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// 获取赋值节点
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AssignmentNode assignmentNode = new AssignmentNode(target: targetNode, value: valueNode);
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return assignmentNode;
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}
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}
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}
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/// <summary>
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/// （不处理分号）解析获取“集合获取”AST节点
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/// </summary>
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/// <param name="sourceNode"></param>
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/// <returns></returns>
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public MemberAccessNode ParseMemberAccessNode(ASTNode sourceNode)
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{
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string memberName = _currentToken.Value; // 成员名称
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var memberAccessNode = new MemberAccessNode(sourceNode, memberName);
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NextToken(); // 消耗成员名称
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memberAccessNode.SetTokenInfo(_currentToken);
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return memberAccessNode;
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}
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/// <summary>
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/// （不处理分号）解析获取“集合获取”AST节点
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/// </summary>
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/// <param name="sourceNode"></param>
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/// <returns></returns>
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public CollectionIndexNode ParseCollectionIndexNode(ASTNode sourceNode)
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{
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var collectionToken = _currentToken;
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string collectionName = _currentToken.Value; // 集合名称
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NextToken(TokenType.SquareBracketsLeft); // 消耗集合名称
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NextToken(); // 消耗 "[" 集合标识符的左中括号
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ASTNode indexNode = ParserExpression(); // 解析获取索引Node
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NextToken(); // 消耗 "]" 集合标识符的右中括号
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if(sourceNode is IdentifierNode)
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{
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var collectionIndexNode = new CollectionIndexNode(sourceNode, indexNode);
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collectionIndexNode.SetTokenInfo(collectionToken); // 表示获取集合第几个索引
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return collectionIndexNode;
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}
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else
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{
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var memberAccessNode = new MemberAccessNode(sourceNode, collectionName).SetTokenInfo(_currentToken); // 表示集合从上一轮获取到的成员获取
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var collectionIndexNode = new CollectionIndexNode(memberAccessNode, indexNode);
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collectionIndexNode.SetTokenInfo(collectionToken); // 表示获取集合第几个索引
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return collectionIndexNode;
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}
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}
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/// <summary>
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/// （不处理分号）解析获取“对象方法调用”AST节点
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/// </summary>
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/// <param name="sourceNode"></param>
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/// <returns></returns>
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public MemberFunctionCallNode ParseMemberFunctionCallNode(ASTNode sourceNode)
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{
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string methodName = _currentToken.Value; // 方法名称
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NextToken(TokenType.ParenthesisLeft); // 消耗方法名称
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List<ASTNode> argNodes = []; // 方法参数Node
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NextToken(); // 消耗 "("
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while (_currentToken.Type != TokenType.ParenthesisRight) // 遇到 ")" 表示参数获取完毕
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{
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ASTNode node = ParserArgNode(); // 解析方法调用参数
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argNodes.Add(node);
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if (_currentToken.Type == TokenType.Comma)
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{
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NextToken(); // 消耗参数分隔符 ","
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}
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}
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NextToken(); // 消耗 ")" 表示参数获取完毕
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var memberFunctionCallNode = new MemberFunctionCallNode(sourceNode, methodName, argNodes);
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memberFunctionCallNode.SetTokenInfo(_currentToken);
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return memberFunctionCallNode; // 结束当前轮次的token判断
|
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}
|
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|
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/// <summary>
|
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/// （不处理分号）解析获取“调用挂载的方法”AST节点
|
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/// </summary>
|
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/// <returns></returns>
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public FunctionCallNode ParseFunctionCallNode()
|
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{
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string functionName = _currentToken.Value; // 方法名称
|
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NextToken(TokenType.ParenthesisLeft); // 消耗方法名称
|
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List<ASTNode> argNodes = []; // 方法参数Node、
|
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NextToken(); // 消耗 "("
|
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while (_currentToken.Type != TokenType.ParenthesisRight) // 遇到 ")" 表示参数获取完毕
|
||
{
|
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ASTNode node = ParserArgNode(); // 解析挂载方法的入参
|
||
argNodes.Add(node);
|
||
if (_currentToken.Type == TokenType.Comma)
|
||
{
|
||
NextToken(); // 消耗参数分隔符 ","
|
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}
|
||
}
|
||
NextToken(); // 消耗 ")"
|
||
var functionCallNode = new FunctionCallNode(functionName, argNodes);
|
||
functionCallNode.SetTokenInfo(_currentToken);
|
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return functionCallNode;
|
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}
|
||
|
||
/// <summary>
|
||
/// （不处理分号，逗号，右括号）用于解析(...) / [...] 中的参数部分。终止条件是 "," 参数分隔符 、")" 方法入参终止符、"]" 数组定义终止符
|
||
/// </summary>
|
||
/// <returns></returns>
|
||
public ASTNode ParserArgNode()
|
||
{
|
||
ASTNode node = ParserExpression(); // 解析参数
|
||
// ParserExpression 会完全解析当前表达式，自动移动到下一个Token，所以需要在这里判断是否符合期望的TokenType
|
||
if(_currentToken.Type == TokenType.Comma
|
||
|| _currentToken.Type == TokenType.ParenthesisRight
|
||
|| _currentToken.Type == TokenType.SquareBracketsRight)
|
||
{
|
||
return node;
|
||
}
|
||
throw new Exception($"解析参数节点后，当前Token类型不符合预期，当前类型为 {_currentToken.Type}。");
|
||
}
|
||
|
||
/// <summary>
|
||
/// （没有分号）解析类定义
|
||
/// </summary>
|
||
/// <returns></returns>
|
||
/// <exception cref="Exception"></exception>
|
||
private ASTNode ParseClassDefinitionNode()
|
||
{
|
||
/*
|
||
class [ClassName] {
|
||
FieldType FieldName1;
|
||
FieldType FieldName2;
|
||
FieldType FieldName3;
|
||
FieldType FieldName4;
|
||
}
|
||
*/
|
||
var coreStartRangeIndex = _lexer.GetIndex(); // 从“class”开始锚定代码范围
|
||
if (!JudgmentKeyword("class")) throw new Exception($"解析类型定义节点时，当前Token不为关键字“class”。");
|
||
NextToken(TokenType.Identifier); // 消耗“class”关键字，获取类名
|
||
string className = _currentToken.Value; // 类型名称
|
||
NextToken(TokenType.BraceLeft); // 消耗类型名称，并判断是否为 "{"
|
||
NextToken();
|
||
var classFields = new Dictionary<string, Type>(); // 记录类型中定义的字段
|
||
while (_currentToken.Type != TokenType.BraceRight) // 遇到 "}" 时表示类型解析完毕
|
||
{
|
||
// 获取字段的类型、名称，类型允许包含逗号（使用C#中的类型）
|
||
/*
|
||
class User {
|
||
System.Int32 Age; // 等效于 int Age;
|
||
}
|
||
字段解析时的预期顺序：
|
||
1 2 3 4 5 6
|
||
[id -> dot -> id -> dot -> id] -> id -> Semicolon
|
||
[ 字段定义 ] 字段名称 解析完成
|
||
*/
|
||
string fieldTypeName = _currentToken.Value;
|
||
string fieldName;
|
||
while (true)
|
||
{
|
||
var peekToken = _lexer.PeekToken();
|
||
if (peekToken.Type == TokenType.Dot)
|
||
{
|
||
NextToken();
|
||
NextToken(TokenType.Identifier);
|
||
fieldTypeName = $"{fieldTypeName}.{_currentToken.Value}"; // 向后扩充
|
||
continue;
|
||
}
|
||
else if (peekToken.Type == TokenType.Identifier)
|
||
{
|
||
// 尝试解析变量名称
|
||
fieldName = peekToken.Value; // 字段名称
|
||
NextToken(); // 消耗类型定义的最后一个Token
|
||
NextToken(TokenType.Semicolon); // 消耗字段名称，如果下一个Token如果不为分号，说明词法异常
|
||
break;
|
||
}
|
||
}
|
||
var fieldType = DynamicObjectHelper.GetCacheType(fieldTypeName); // 查询是否在其它脚本中创建过类型
|
||
fieldType = fieldType ?? fieldTypeName.ToTypeOfString(); // 如果没有定义过类型，则从c#运行时尝试获取类型
|
||
if(fieldType is null)
|
||
{
|
||
throw new Exception($"定义类型 {className} 时，解析成员 {fieldName} 失败，没有找到类型 {fieldTypeName}。");
|
||
}
|
||
classFields.Add(fieldName, fieldType);
|
||
NextToken(); // 当前字段类型定义完毕，消耗";"
|
||
}
|
||
var classToken = _currentToken;
|
||
classToken.Code = _lexer.GetCoreContent(coreStartRangeIndex); // 收集类型定义的代码。
|
||
NextToken(); // 当前类型定义完毕，消耗"}"
|
||
|
||
// 词法分析时不应该获取类型，类型应该放在类型分支中进行追踪
|
||
var type = DynamicObjectHelper.GetCacheType(className);
|
||
if(type is null) // 解析时创建类型，因为后续的类型定义中，某个字段可能使用该类型，而解析时需要获取到其类型
|
||
{
|
||
DynamicObjectHelper.CreateTypeWithProperties(classFields, className);
|
||
}
|
||
|
||
|
||
TypeNode classTypeNode = new TypeNode(className);
|
||
Dictionary<string, TypeNode> propertyTypes = classFields.ToDictionary(f => f.Key, f => new TypeNode(f.Value.FullName));
|
||
|
||
var classTypeDefinitionNode = new ClassTypeDefinitionNode(propertyTypes, classTypeNode);
|
||
|
||
classTypeDefinitionNode.SetTokenInfo(classToken);
|
||
return classTypeDefinitionNode;
|
||
}
|
||
|
||
/// <summary>
|
||
/// 解析 return 语句。
|
||
/// </summary>
|
||
/// <returns></returns>
|
||
public ReturnNode ParseReturnNode()
|
||
{
|
||
var returnToken = _currentToken;
|
||
if (!JudgmentKeyword("return")) throw new Exception($"解析返回节点时，当前Token不为关键字“return”。");
|
||
NextToken(); // 消耗关键字
|
||
ReturnNode returnNode;
|
||
if (_currentToken.Type == TokenType.Semicolon)
|
||
{
|
||
returnNode = new ReturnNode(); // 空返回
|
||
}
|
||
else
|
||
{
|
||
var resultValue = BooleanExpression(); // 解析值表达式
|
||
returnNode = new ReturnNode(resultValue); // 带值返回
|
||
}
|
||
returnNode.SetTokenInfo(returnToken);
|
||
if (_currentToken.Type == TokenType.Semicolon)
|
||
{
|
||
NextToken(); // 消耗 ";" ，语句完毕
|
||
}
|
||
return returnNode;
|
||
}
|
||
|
||
/// <summary>
|
||
/// （不处理分号）解析对象实例化行为
|
||
/// </summary>
|
||
/// <returns></returns>
|
||
/// <exception cref="Exception"></exception>
|
||
public ObjectInstantiationNode ParseObjectInstantiationNode()
|
||
{
|
||
|
||
// 获取类型名称，类型允许包含逗号（使用C#中的类型）
|
||
/*
|
||
new [TypeName]([Exp1],[Exp2]);
|
||
类型解析时的预期顺序：
|
||
1 2 3 4 5 6
|
||
new -> [id -> dot -> id -> dot -> id] -> ParenthesisLeft -> [CtroArg] -> ParenthesisRight -> Semicolon
|
||
[ 类型定义 ] 括号 "(" 构造入参 括号 ")" 分号，解析完成
|
||
*/
|
||
var instantiationToken = _currentToken;
|
||
// 第一次进入循环时，会消耗 new 关键字
|
||
NextToken(TokenType.Identifier);
|
||
var typeToken = _currentToken;
|
||
string typeName = _currentToken.Value; // 类名
|
||
List<ASTNode> ctorArguments = []; // 构造入参
|
||
|
||
while (true)
|
||
{
|
||
var peekToken = _lexer.PeekToken();
|
||
if (peekToken.Type == TokenType.Dot)
|
||
{
|
||
NextToken();
|
||
NextToken();
|
||
typeName = $"{typeName}.{_currentToken.Value}"; // 向后扩充
|
||
continue;
|
||
}
|
||
else if (peekToken.Type == TokenType.ParenthesisLeft)
|
||
{
|
||
// 类名定义完成，解析构造方法入参。
|
||
NextToken(); // 消耗 类型Token
|
||
NextToken(); // 消耗 "("
|
||
while (_currentToken.Type != TokenType.ParenthesisRight) // 表示参数获取完毕
|
||
{
|
||
ASTNode node = ParserArgNode(); // 解析构造方法的入参
|
||
ctorArguments.Add(node);
|
||
if(_currentToken.Type == TokenType.Comma)
|
||
{
|
||
NextToken(); // 消耗参数分隔符 ","
|
||
}
|
||
}
|
||
NextToken(); // 消耗 ")"
|
||
break;
|
||
}
|
||
else if (peekToken.Type == TokenType.BraceLeft)
|
||
{
|
||
NextToken(); // 消耗 类型名称
|
||
break;
|
||
}
|
||
}
|
||
|
||
TypeNode typeNode = new TypeNode(typeName);
|
||
typeNode.SetTokenInfo(typeToken);
|
||
ObjectInstantiationNode objectInstantiationNode = new ObjectInstantiationNode(typeNode, ctorArguments);
|
||
List<CtorAssignmentNode> ctorAssignmentNodes = new List<CtorAssignmentNode>(); // 构造器赋值
|
||
|
||
/* 类型构造器
|
||
new Type {
|
||
Value1 = [Exp] ,
|
||
Value2 = [Exp] ,
|
||
}
|
||
*/
|
||
if (_currentToken.Type == TokenType.BraceLeft)
|
||
{
|
||
NextToken(); // 消耗 "{"
|
||
string propertyName = "";
|
||
Token propertyToken = _currentToken;
|
||
while( _currentToken.Type != TokenType.BraceRight)
|
||
{
|
||
if (_currentToken.Type == TokenType.Identifier)
|
||
{
|
||
propertyToken = _currentToken;
|
||
propertyName = _currentToken.Value;
|
||
NextToken();
|
||
continue;
|
||
}
|
||
else if (JudgmentOperator(_currentToken,"="))
|
||
{
|
||
NextToken();
|
||
ASTNode value = ParserExpression();
|
||
CtorAssignmentNode ctorAssignmentNode = new CtorAssignmentNode(typeNode, propertyName, value);
|
||
ctorAssignmentNode.SetTokenInfo(propertyToken);
|
||
ctorAssignmentNodes.Add(ctorAssignmentNode);
|
||
if(_currentToken .Type == TokenType.Comma)
|
||
{
|
||
NextToken(); // 消耗 ","
|
||
continue;
|
||
}
|
||
else if (_currentToken.Type == TokenType.BraceRight)
|
||
{
|
||
break;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
throw new Exception($"类型构造器词法分析异常。{_currentToken.ToString()}");
|
||
}
|
||
}
|
||
NextToken(); // 消耗 "}"
|
||
objectInstantiationNode.SetCtorAssignments(ctorAssignmentNodes);
|
||
}
|
||
|
||
objectInstantiationNode.SetTokenInfo(instantiationToken);
|
||
return objectInstantiationNode;
|
||
}
|
||
|
||
|
||
#region 控制流语句解析
|
||
|
||
/// <summary>
|
||
/// 解析 if 语句。
|
||
/// </summary>
|
||
/// <returns></returns>
|
||
/// <exception cref="Exception"></exception>
|
||
private ASTNode ParseIf()
|
||
{
|
||
NextToken(TokenType.ParenthesisLeft); // 消耗 "if"
|
||
NextToken(); // 消耗 "("
|
||
ASTNode condition = BooleanExpression();
|
||
NextToken(TokenType.BraceLeft); // 消耗 ")"
|
||
NextToken(); // 消耗 "{"
|
||
// 解析大括号中的语句
|
||
List<ASTNode> trueBranch = new List<ASTNode>();
|
||
List<ASTNode> falseBranch = new List<ASTNode>();
|
||
while (_currentToken.Type != TokenType.BraceRight)
|
||
{
|
||
var astNode = Statement(); // 解析 true 分支中的语句
|
||
if (astNode != null)
|
||
{
|
||
trueBranch.Add(astNode);
|
||
}
|
||
}
|
||
// 确保匹配右大括号 }
|
||
if (_currentToken.Type != TokenType.BraceRight)
|
||
{
|
||
throw new Exception("非预期的标识符 '}' ");
|
||
}
|
||
NextToken(); // 消耗 "}"
|
||
if (_currentToken.Type == TokenType.Keyword && _currentToken.Value == "else")
|
||
{
|
||
NextToken(TokenType.BraceLeft); // 消耗 "else"
|
||
NextToken(); // 消耗 "{"
|
||
while (_currentToken.Type != TokenType.BraceRight)
|
||
{
|
||
var astNode = Statement(); // 解析 else 分支中的语句
|
||
if (astNode != null)
|
||
{
|
||
falseBranch.Add(astNode); // 将 else 分支的语句添加到 falseBranch 中
|
||
}
|
||
}
|
||
// 确保匹配右大括号 }
|
||
if (_currentToken.Type != TokenType.BraceRight)
|
||
{
|
||
throw new Exception("非预期的标识符 '}' ");
|
||
}
|
||
NextToken(); // 消耗 "}"
|
||
}
|
||
|
||
return new IfNode(condition, trueBranch, falseBranch).SetTokenInfo(_currentToken);
|
||
}
|
||
|
||
/// <summary>
|
||
/// 解析 while 循环语句。
|
||
/// </summary>
|
||
/// <returns></returns>
|
||
private ASTNode ParseWhile()
|
||
{
|
||
|
||
NextToken(TokenType.ParenthesisLeft); // 消耗 "while"
|
||
NextToken(); // 消耗 "("
|
||
ASTNode condition = BooleanExpression();
|
||
NextToken(TokenType.BraceLeft); // 消耗 ")"
|
||
NextToken(); // 消耗 "{"
|
||
List<ASTNode> body = new List<ASTNode>();
|
||
while (_currentToken.Type != TokenType.BraceRight)
|
||
{
|
||
var node = Statement();
|
||
if (node is not null)
|
||
{
|
||
body.Add(node); // 解析循环体中的语句
|
||
}
|
||
}
|
||
_currentToken = _lexer.NextToken(); // 消耗 "}"
|
||
return new WhileNode(condition, body).SetTokenInfo(_currentToken);
|
||
}
|
||
|
||
|
||
|
||
|
||
#endregion
|
||
|
||
#region 表达式解析：BooleanExpression -> ComparisonExpression -> Expression -> Term -> Factor
|
||
/// <summary>
|
||
/// 解析表达式
|
||
/// </summary>
|
||
/// <returns></returns>
|
||
private ASTNode ParserExpression()
|
||
{
|
||
// 处理表达式时，从布尔表达式开始。
|
||
return BooleanExpression();
|
||
}
|
||
#region 表达式处理
|
||
|
||
/// <summary>
|
||
/// 布尔表达式
|
||
/// </summary>
|
||
/// <returns></returns>
|
||
private ASTNode BooleanExpression()
|
||
{
|
||
ASTNode left = ComparisonExpression();
|
||
|
||
while (_currentToken.Type == TokenType.Operator &&
|
||
(_currentToken.Value == "&&" || _currentToken.Value == "||"))
|
||
{
|
||
string op = _currentToken.Value;
|
||
_currentToken = _lexer.NextToken();
|
||
ASTNode right = ComparisonExpression();
|
||
left = new BinaryOperationNode(left, op, right).SetTokenInfo(_currentToken);
|
||
}
|
||
|
||
return left;
|
||
}
|
||
|
||
/// <summary>
|
||
/// 比较表达式（==, !=, <, <=, >, >=）
|
||
/// </summary>
|
||
/// <returns></returns>
|
||
private ASTNode ComparisonExpression()
|
||
{
|
||
ASTNode left = Expression();
|
||
|
||
while (_currentToken.Type == TokenType.Operator &&
|
||
(_currentToken.Value == "==" || _currentToken.Value == "!=" ||
|
||
_currentToken.Value == "<" || _currentToken.Value == "<=" ||
|
||
_currentToken.Value == ">" || _currentToken.Value == ">="))
|
||
{
|
||
string op = _currentToken.Value;
|
||
_currentToken = _lexer.NextToken();
|
||
ASTNode right = Expression();
|
||
left = new BinaryOperationNode(left, op, right).SetTokenInfo(_currentToken);
|
||
}
|
||
|
||
return left;
|
||
}
|
||
|
||
/// <summary>
|
||
/// 加减
|
||
/// </summary>
|
||
/// <returns></returns>
|
||
private ASTNode Expression()
|
||
{
|
||
ASTNode left = Term();
|
||
|
||
while (_currentToken.Type == TokenType.Operator &&
|
||
(_currentToken.Value == "+" || _currentToken.Value == "-"))
|
||
{
|
||
string op = _currentToken.Value;
|
||
_currentToken = _lexer.NextToken();
|
||
ASTNode right = Term();
|
||
left = new BinaryOperationNode(left, op, right).SetTokenInfo(_currentToken);
|
||
}
|
||
|
||
return left;
|
||
}
|
||
|
||
/// <summary>
|
||
/// 乘除
|
||
/// </summary>
|
||
/// <returns></returns>
|
||
private ASTNode Term()
|
||
{
|
||
ASTNode left = Factor();
|
||
while (_currentToken.Type == TokenType.Operator &&
|
||
(_currentToken.Value == "*" || _currentToken.Value == "/"))
|
||
{
|
||
string op = _currentToken.Value;
|
||
_currentToken = _lexer.NextToken();
|
||
ASTNode right = Factor();
|
||
left = new BinaryOperationNode(left, op, right).SetTokenInfo(_currentToken);
|
||
}
|
||
|
||
return left;
|
||
}
|
||
#endregion
|
||
|
||
/// <summary>
|
||
/// 解析因子（Factor），用于处理基本的字面量、标识符、括号表达式等。
|
||
/// </summary>
|
||
/// <returns></returns>
|
||
/// <exception cref="Exception"></exception>
|
||
private ASTNode Factor()
|
||
{
|
||
/*
|
||
|
||
表达式类型：
|
||
1. 赋值语句中的右值 ... = [Exp];（左值不为表达式）
|
||
2. 一般语句 [Exp];
|
||
3. 方法中参数 func([Exp1],[Exp2],[Exp3]...) 单个入参
|
||
3. 实例化类型 new Class();
|
||
表达式特征：
|
||
a. 在第 1 次分析中，当 _currentToken.Type 为 Identifier 时，下一个 Token 可能为：
|
||
1. TokenType.ParenthesisLeft => 调用本地方法
|
||
2. TokenType.Dot => 当前 Toke 代表变量，需要获取对象成员
|
||
3. TokenType.ParenthesisLeft => 当前 Token 表示数组对象，索引为 PeekToken(2)，根据索引获取成员
|
||
4. TokenType.Keyword("new") => 实例化类型
|
||
5. TokenType.Semicolon => 表达式结束
|
||
b. 在第 N + 1 次分析中，当 _currentToken.Type 为 Identifier 时，下一个 Token 可能为：
|
||
1. TokenType.ParenthesisLeft => 以上一次分析得到的 Node 为 Source Object，调用其的方法。
|
||
2. TokenType.Dot => 以上一次分析得到的 Node 为 Source Object，需要获取对象成员
|
||
3. TokenType.ParenthesisLeft => 以上一次分析得到的 Node 为 Source Object，获取 _currentToken.Value 对应的数组成员，索引为 PeekToken(2)，根据索引获取成员
|
||
4. TokenType.Keyword("new") => 实例化类型
|
||
5. TokenType.Semicolon => 表达式结束
|
||
c. 当 _currentToken.Type 为 ParenthesisLeft 时 ：
|
||
存在嵌套表达式，再次调用 ParserExpression() 方法。
|
||
|
||
*/
|
||
|
||
// 标识符节点
|
||
var factorToken = _currentToken; // 记录一下进入 Factor() 的 Token
|
||
if (_currentToken.Type == TokenType.Identifier)
|
||
{
|
||
/*
|
||
表达式获取 Expression()
|
||
variable; | 变量 √
|
||
value; | 显式设置的字面量。 √
|
||
obj.Value...; | obj为之前的上下文中出现过的变量，调用表达式包含对象成员数组、方法
|
||
array[...]; | array为之前的上下文中出现过的变量。
|
||
array[...].Value...; | array为之前的上下文中出现过的变量。调用表达式包含对象成员数组、方法
|
||
new Class(...); | 实例化类型，包含构造函数 √
|
||
*/
|
||
var backupToken = _currentToken;
|
||
//var tempPeekToken = _lexer.PeekToken();
|
||
var targetNode = new IdentifierNode(_currentToken.Value).SetTokenInfo(_currentToken); // 获取变量
|
||
var peekToken2 = _lexer.PeekToken(); // 消耗 第一个标识符
|
||
|
||
if (peekToken2.Type == TokenType.Semicolon
|
||
|| peekToken2.Type == TokenType.ParenthesisRight
|
||
|| peekToken2.Type == TokenType.SquareBracketsRight
|
||
|| peekToken2.Type == TokenType.Comma
|
||
|| peekToken2.Type == TokenType.Operator
|
||
)
|
||
{
|
||
NextToken(); // 消耗标识符
|
||
return targetNode;
|
||
}
|
||
if (peekToken2.Type == TokenType.ParenthesisLeft)
|
||
{
|
||
// 解析调用挂载方法
|
||
// ... = variable()()();
|
||
// 暂时不支持柯里化调用... = variable()()();
|
||
var functionCallNode = ParseFunctionCallNode();
|
||
if(_currentToken.Type == TokenType.Semicolon || _currentToken.Type == TokenType.Operator)
|
||
{
|
||
return functionCallNode;
|
||
}
|
||
targetNode = functionCallNode;
|
||
}
|
||
else if (peekToken2.Type == TokenType.SquareBracketsLeft)
|
||
{
|
||
// 解析集合获取
|
||
var collectionIndexNode = ParseCollectionIndexNode(targetNode);
|
||
if (_currentToken.Type == TokenType.Semicolon || _currentToken.Type == TokenType.Operator)
|
||
{
|
||
return collectionIndexNode;
|
||
}
|
||
targetNode = collectionIndexNode;
|
||
}else if (peekToken2.Type == TokenType.Dot)
|
||
{
|
||
NextToken(); // 消耗标识符
|
||
}
|
||
|
||
// 开始解析
|
||
List<ASTNode> nodes = [targetNode];
|
||
ASTNode? source;
|
||
while (true)
|
||
{
|
||
var peekToken = _currentToken; // _lexer.PeekToken(); // 获取下一个token开始判断
|
||
source = nodes[^1]; // 重定向节点
|
||
if(source.StartIndex == 501)
|
||
{
|
||
|
||
}
|
||
if (peekToken.Type == TokenType.Dot) // 从对象获取
|
||
{
|
||
/*
|
||
1. 获取成员 => PeekToken.Type = TokenType.Dot
|
||
2. 获取集合 => PeekToken.Type = TokenType.SquareBracketsLeft
|
||
3. 调用成员方法 => PeekToken.Type = TokenType.ParenthesisLeft
|
||
*/
|
||
NextToken(); // 消耗 "." 并获取下一个成员。
|
||
var peekToken3 = _lexer.PeekToken();
|
||
ASTNode tempNode = peekToken3.Type switch
|
||
{
|
||
TokenType.Comma or TokenType.Operator or TokenType.Dot or TokenType.Semicolon or TokenType.ParenthesisRight
|
||
=> ParseMemberAccessNode(source), // 获取对象中的成员 source.Value...
|
||
|
||
TokenType.SquareBracketsLeft => ParseCollectionIndexNode(source), // 获取集合中的元素 source[index]....
|
||
TokenType.ParenthesisLeft => ParseMemberFunctionCallNode(source), // 获取需要调用的方法 source(arg1,arg2...)...
|
||
_ => throw new Exception($"无法从对象获取成员，当前Token : {peekToken.ToString()}。")
|
||
};
|
||
nodes.Add(tempNode);
|
||
continue; // 结束当前轮次的token判断
|
||
|
||
}
|
||
else if (peekToken.Type == TokenType.ParenthesisLeft) // 调用对象方法
|
||
{
|
||
var memberFunctionCallNode = ParseMemberFunctionCallNode(source);
|
||
nodes.Add(memberFunctionCallNode);
|
||
continue; // 结束当前轮次的token判断
|
||
|
||
}
|
||
else if (peekToken.Type == TokenType.SquareBracketsLeft) // 集合获取
|
||
{
|
||
var collectionIndexNode = ParseCollectionIndexNode(source);
|
||
nodes.Add(collectionIndexNode);
|
||
continue; // 结束当前轮次的token判断
|
||
}
|
||
else if (peekToken.Type == TokenType.Semicolon)
|
||
{
|
||
break;
|
||
}
|
||
else
|
||
{
|
||
if(peekToken.Type == TokenType.ParenthesisRight // 可能解析完了方法参数
|
||
|| peekToken.Type == TokenType.Comma // 可能解析完了方法参数
|
||
|| peekToken.Type == TokenType.Operator // 可能解析完了方法参数
|
||
|| peekToken.Type == TokenType.ParenthesisRight) // 可能解析完了下标索引
|
||
{
|
||
return source;
|
||
}
|
||
// 应该是异常，如果是其它符号，说明词法解析不符合预期
|
||
throw new Exception($"在 Expression().Factor() 遇到意外的 Token: [{_currentToken.Type}]\"{_currentToken.Value}\" ");
|
||
|
||
}
|
||
}
|
||
return source;
|
||
|
||
}
|
||
else if (_currentToken.Type == TokenType.ParenthesisLeft) // 嵌套表达式
|
||
{
|
||
NextToken(); // 消耗 "("
|
||
var expNode = BooleanExpression();
|
||
if (_currentToken.Type != TokenType.ParenthesisRight)
|
||
throw new Exception($"解析嵌套表达式时遇到非预期的符号 \"{_currentToken.Type}\"，预期符号为\")\"。");
|
||
NextToken(); // 消耗 ")"
|
||
return expNode;
|
||
}
|
||
else if (_currentToken.Type == TokenType.SquareBracketsLeft)
|
||
{
|
||
NextToken(); // 消耗 "["
|
||
List<ASTNode> elements = [];
|
||
while (_currentToken.Type != TokenType.SquareBracketsRight) // 遇到 "]" 时结束
|
||
{
|
||
var element = ParserArgNode();
|
||
elements.Add(element);
|
||
if (_currentToken.Type == TokenType.Comma)
|
||
{
|
||
NextToken(); // 消耗参数分隔符 ","
|
||
}
|
||
}
|
||
NextToken(); // 消耗 "]"
|
||
|
||
ArrayDefintionNode arrayDefintionNode = new ArrayDefintionNode(elements);
|
||
return arrayDefintionNode.SetTokenInfo(_currentToken);
|
||
}
|
||
else if(_currentToken.Type == TokenType.Keyword && _currentToken.Value == "new") // 创建对象
|
||
{
|
||
return ParseObjectInstantiationNode();
|
||
}
|
||
|
||
#region 字面量因子
|
||
else if (_currentToken.Type == TokenType.Null)
|
||
{
|
||
NextToken(); // 消耗 null
|
||
return new NullNode().SetTokenInfo(factorToken);
|
||
}
|
||
else if (_currentToken.Type == TokenType.Boolean)
|
||
{
|
||
var value = bool.Parse(_currentToken.Value);
|
||
NextToken(); // 消耗布尔量
|
||
return new BooleanNode(value).SetTokenInfo(factorToken);
|
||
}
|
||
else if (_currentToken.Type == TokenType.String)
|
||
{
|
||
var value = _currentToken.Value;
|
||
NextToken(); // 消耗字符串
|
||
var node = new StringNode(value).SetTokenInfo(factorToken);
|
||
return node;
|
||
}
|
||
else if (_currentToken.Type == TokenType.Char)
|
||
{
|
||
var value = _currentToken.Value;
|
||
NextToken(); ; // 消耗Char
|
||
return new CharNode(value).SetTokenInfo(factorToken);
|
||
}
|
||
else if (_currentToken.Type == TokenType.InterpolatedString)
|
||
{
|
||
// 暂未实现插值字符串
|
||
// 可能是插值字符串；
|
||
// let context = $"a{A}b{B}c";
|
||
// let context = "a" + A + "b" + B + c;
|
||
NextToken(); // 消耗字符串
|
||
while (_currentToken.Type == TokenType.String)
|
||
{
|
||
}
|
||
}
|
||
else if (_currentToken.Type == TokenType.NumberInt)
|
||
{
|
||
var value = int.Parse(_currentToken.Value);
|
||
NextToken(); // 消耗 int 整型
|
||
return new NumberIntNode(value).SetTokenInfo(factorToken);
|
||
}
|
||
else if (_currentToken.Type == TokenType.NumberLong)
|
||
{
|
||
var value = long.Parse(_currentToken.Value);
|
||
NextToken(); // 消耗 long 整型
|
||
return new NumberLongNode(value).SetTokenInfo(factorToken);
|
||
}
|
||
else if (_currentToken.Type == TokenType.NumberFloat)
|
||
{
|
||
var value = float.Parse(_currentToken.Value);
|
||
NextToken(); // 消耗 float 浮点数
|
||
return new NumberFloatNode(value).SetTokenInfo(factorToken);
|
||
}
|
||
else if (_currentToken.Type == TokenType.NumberDouble)
|
||
{
|
||
var value = double.Parse(_currentToken.Value);
|
||
NextToken(); // 消耗 double 浮点数
|
||
return new NumberDoubleNode(value).SetTokenInfo(factorToken);
|
||
}
|
||
#endregion
|
||
|
||
|
||
throw new Exception($"在 Expression().Factor() 遇到意外的 TokenType ,{_currentToken.Type} {_currentToken.Value} ");
|
||
}
|
||
#endregion
|
||
|
||
#region 辅助方法
|
||
|
||
private Token NextToken()
|
||
{
|
||
_currentToken = _lexer.NextToken();
|
||
return _currentToken;
|
||
}
|
||
|
||
private Token NextToken(TokenType expectationTokenType)
|
||
{
|
||
_currentToken = _lexer.NextToken();
|
||
if(_currentToken.Type != expectationTokenType)
|
||
{
|
||
throw new Exception($"分析器获取下一个Token时，期望获取 {expectationTokenType} ，但实际获取 {_currentToken.Type}。" +
|
||
$"Value : {_currentToken.Value}" +
|
||
$"StartIndex : {_currentToken.StartIndex}" +
|
||
$"Length : {_currentToken.Length}" +
|
||
$"");
|
||
}
|
||
return _currentToken;
|
||
}
|
||
|
||
/// <summary>
|
||
/// 判断当前Token操作符类型
|
||
/// </summary>
|
||
/// <param name="operator"></param>
|
||
/// <returns></returns>
|
||
private bool JudgmentTokenType(TokenType tokenType)
|
||
{
|
||
return _currentToken.Type == tokenType;
|
||
}
|
||
|
||
/// <summary>
|
||
/// 判断Token操作符类型
|
||
/// </summary>
|
||
/// <param name="operator"></param>
|
||
/// <returns></returns>
|
||
private bool JudgmentOperator(Token peekToken, string @operator)
|
||
{
|
||
if (peekToken.Type != TokenType.Operator)
|
||
{
|
||
return false;
|
||
}
|
||
return peekToken.Value == @operator;
|
||
}
|
||
|
||
/// <summary>
|
||
/// 判断当前Token关键字类型
|
||
/// </summary>
|
||
/// <param name="operator"></param>
|
||
/// <returns></returns>
|
||
private bool JudgmentKeyword(string keyword)
|
||
{
|
||
if (_currentToken.Type != TokenType.Keyword)
|
||
{
|
||
return false;
|
||
}
|
||
return _currentToken.Value == keyword;
|
||
}
|
||
|
||
|
||
|
||
#endregion
|
||
|
||
}
|
||
|
||
}
|
