解释器解释语法一

[源码下载] 设计模式 - Interpreter Pattern(解释器模式) 作者：webabcd 介绍 给定一个语言, 定义它的文法的一种表示，并定义一个解释器，该解释器使用该表示来解释语言中的句子。 示例 有一个Message实体类，某个类对它的操作有Get()方法。现在要求用具有某一规则的中文语法来执行这个操作。 MessageModel using System; using System.Collections.Generic; using System.Text; namespace Pattern.Interpreter { /**////

/// Message实体类 ///

public class MessageModel { /**////

/// 构造函数 ///

/// Message内容 /// Message发布时间 public MessageModel(string msg, DateTime pt) { this._message = msg; this._publishTime = pt; } private string _message; /**////

/// Message内容 ///

public string Message { get { return _message; } set { _message = value; } } private DateTime _publishTime; /**////

/// Message发布时间 ///

public DateTime PublishTime { get { return _publishTime; } set { _publishTime = value; } } } } SqlMessage using System; using System.Collections.Generic; using System.Text; namespace Pattern.Interpreter { /**////

/// Sql方式操作Message ///

public class SqlMessage { /**////

/// 获取Message ///

/// public static List Get() { List l = new List(); l.Add(new MessageModel("SQL方式获取Message", DateTime.Now)); return l; } } } Context using System; using System.Collections.Generic; using System.Text; namespace Pattern.Interpreter { /**////

/// Context ///

public class Context { private string _input; private string _output; /**////

/// 构造函数 ///

/// 输入内容 public Context(string input) { this._input = input; } /**////

/// 输入内容 ///

public string Input { get { return _input; } set { _input = value; } } /**////

/// 输出内容 ///

public string Output { get { return _output; } set { _output = value; } } } } AbstractExpression using System; using System.Collections.Generic; using System.Text; namespace Pattern.Interpreter { /**////

/// 抽象公式（AbstractExpression） ///

public abstract class AbstractExpression { /**////

/// 解释Context的方法 ///

/// context public void Interpret(Context context) { if (String.IsNullOrEmpty(context.Input)) { return; } context.Output += GetCSharp(context.Input); } /**////

/// 获得输入内容所对应的C#代码 ///

/// source /// private string GetCSharp(string source) { string csharp = ""; string word = ""; // 从输入内容中取得要解释的词 word = GetWord(source); // 从字典中找到word所对应的C#代码 GetDictionary().TryGetValue(word, out csharp); return csharp; } /**////

/// 从输入内容中取得要解释的词 ///

/// source /// public abstract string GetWord(string source); /**////

/// 获取字典 ///

/// public abstract Dictionary GetDictionary(); } } DatabaseExpression using System; using System.Collections.Generic; using System.Text; using System.Text.RegularExpressions; namespace Pattern.Interpreter { /**////

/// 终端公式（TerminalExpression）分析与数据库相关的 ///

public class DatabaseExpression : AbstractExpression { /**////

/// 从输入内容中取得要解释的词 ///

/// source /// public override string GetWord(string source) { MatchCollection mc; Regex r = new Regex(@"\{(.*)\}"); mc = r.Matches(source); return mc[0].Groups[1].Value; } /**////

/// 获取与数据库相关的字典 ///

/// public override Dictionary GetDictionary() { Dictionary d = new Dictionary(); d.Add("数据库", "Sql"); return d; } } } ObjectExpression using System; using System.Collections.Generic; using System.Text; using System.Text.RegularExpressions; namespace Pattern.Interpreter { /**////

/// 终端公式（TerminalExpression）分析与对象相关的 ///

public class ObjectExpression : AbstractExpression { /**////

/// 从输入内容中取得要解释的词 ///

/// source /// public override string GetWord(string source) { MatchCollection mc; Regex r = new Regex(@"\[(.*)\]"); mc = r.Matches(source); return mc[0].Groups[1].Value; } /**////

/// 获取与对象相关的字典 ///

/// public override Dictionary GetDictionary() { Dictionary d = new Dictionary(); d.Add("信息", "Message"); return d; } } } MethodExpression using System; using System.Collections.Generic; using System.Text; using System.Text.RegularExpressions; namespace Pattern.Interpreter { /**////

/// 终端公式（TerminalExpression）分析与方法相关的 ///

public class MethodExpression : AbstractExpression { /**////

/// 从输入内容中取得要解释的词 ///

/// source /// public override string GetWord(string source) { MatchCollection mc; Regex r = new Regex(@"\((.*)\)"); mc = r.Matches(source); return mc[0].Groups[1].Value; } /**////

/// 获取与方法相关的字典 ///

/// public override Dictionary GetDictionary() { Dictionary d = new Dictionary(); d.Add("获取", ".Get()"); return d; } } } client using System; using System.Data; using System.Configuration; using System.Collections; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using Microsoft.CSharp; using System.Reflection; using System.Text; using System.Collections.Generic; using Pattern.Interpreter; public partial class Interpreter : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { string chinese = "{数据库}[信息](获取)"; Context context = new Context(chinese); List l = new List(); l.Add(new DatabaseExpression()); l.Add(new ObjectExpression()); l.Add(new MethodExpression()); foreach (AbstractExpression exp in l) { exp.Interpret(context); } Assembly assembly = Assembly.Load("Pattern.Interpreter"); MethodInfo method = assembly.GetType("Pattern.Interpreter." + context.Output.Split('.')[0]).GetMethod(context.Output.Split('.')[1].Replace("()", "")); object obj = method.Invoke(null, null); List m = (List)obj; Response.Write("中文语法：" + chinese); Response.Write("
"); Response.Write("解释后的C#代码：" + context.Output); Response.Write("
"); Response.Write("执行结果：" + m[0].Message + " " + m[0].PublishTime.ToString()); } } 运行结果 中文语法：{数据库}[信息](获取) 解释后的C#代码：SqlMessage.Get() 执行结果：SQL方式获取Message 2007-5-1 8:48:07 OK [源码下载]