SOMS/test/MathConsoleApp/MathExpress.cs

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C#
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2024-07-15 10:31:26 +08:00
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.Emit;
using System;
using System.CodeDom.Compiler;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.Loader;
using System.Text;
namespace MathConsoleApp
{
/// <summary>
/// 本类用来将字符串转为可执行文本并执行
/// </summary>
public class MyEvaluator
{
#region
/// <summary>
/// 可执行串的构造函数
/// </summary>
/// <param name="items">
/// 可执行字符串数组
/// </param>
public MyEvaluator(EvaluatorItem[] items)
{
ConstructEvaluator(items); //调用解析字符串构造函数进行解析
}
/// <summary>
/// 可执行串的构造函数
/// </summary>
/// <param name="returnType">返回值类型</param>
/// <param name="expression">执行表达式</param>
/// <param name="name">执行字符串名称</param>
public MyEvaluator(Type returnType, string expression, string name)
{
//创建可执行字符串数组
EvaluatorItem[] items = { new EvaluatorItem(returnType, expression, name) };
ConstructEvaluator(items); //调用解析字符串构造函数进行解析
}
/// <summary>
/// 可执行串的构造函数
/// </summary>
/// <param name="item">可执行字符串项</param>
public MyEvaluator(EvaluatorItem item)
{
EvaluatorItem[] items = { item };//将可执行字符串项转为可执行字符串项数组
ConstructEvaluator(items); //调用解析字符串构造函数进行解析
}
/// <summary>
/// 解析字符串构造函数
/// </summary>
/// <param name="items">待解析字符串数组</param>
private void ConstructEvaluator_net46(EvaluatorItem[] items)
{
string sysFile = typeof(Enumerable).Assembly.Location;
string sysDir = Directory.GetParent(sysFile).FullName;
//创建C#编译器实例
CodeDomProvider provider = CodeDomProvider.CreateProvider("C#");
//CodeDomProvider provider = new CSharpCodeProvider();
//过时了
//ICodeCompiler comp = provider.CreateCompiler();
//编译器的传入参数
CompilerParameters cp = new CompilerParameters();
cp.ReferencedAssemblies.Add(Path.Combine(sysDir, "System.dll")); //添加程序集 system.dll 的引用
cp.ReferencedAssemblies.Add(Path.Combine(sysDir, "System.Data.dll")); //添加程序集 system.data.dll 的引用
cp.ReferencedAssemblies.Add(Path.Combine(sysDir, "System.Xml.dll")); //添加程序集 system.xml.dll 的引用
cp.GenerateExecutable = false; //不生成可执行文件
cp.GenerateInMemory = true; //在内存中运行
StringBuilder code = new StringBuilder(); //创建代码串
/*
*
*/
code.Append("using System; \n");
code.Append("using System.Data; \n");
code.Append("using System.Data.SqlClient; \n");
code.Append("using System.Data.OleDb; \n");
code.Append("using System.Xml; \n");
code.Append("namespace SSEC.Math { \n"); //生成代码的命名空间为EvalGuy和本代码一样
code.Append(" public class _Evaluator { \n"); //产生 _Evaluator 类,所有可执行代码均在此类中运行
foreach (EvaluatorItem item in items) //遍历每一个可执行字符串项
{
code.AppendFormat(" public {0} {1}() ", //添加定义公共函数代码
item.ReturnType.Name, //函数返回值为可执行字符串项中定义的返回值类型
item.Name); //函数名称为可执行字符串项中定义的执行字符串名称
code.Append("{ "); //添加函数开始括号
code.AppendFormat("return ({0});", item.Expression);//添加函数体,返回可执行字符串项中定义的表达式的值
code.Append("} \n"); //添加函数结束括号
}
code.Append("} }"); //添加类结束和命名空间结束括号
//得到编译器实例的返回结果
CompilerResults cr = provider.CompileAssemblyFromSource(cp, code.ToString());//comp
if (cr.Errors.HasErrors) //如果有错误
{
StringBuilder error = new StringBuilder(); //创建错误信息字符串
error.Append("编译有错误的表达式: "); //添加错误文本
foreach (CompilerError err in cr.Errors) //遍历每一个出现的编译错误
{
error.AppendFormat("{0}\n", err.ErrorText); //添加进错误文本,每个错误后换行
}
throw new Exception("编译错误: " + error.ToString());//抛出异常
}
Assembly a = cr.CompiledAssembly; //获取编译器实例的程序集
_Compiled = a.CreateInstance("SSEC.Math._Evaluator"); //通过程序集查找并声明 SSEC.Math._Evaluator 的实例
}
/// <summary>
/// 解析字符串构造函数
/// </summary>
/// <param name="items">待解析字符串数组</param>
private void ConstructEvaluator(EvaluatorItem[] items)
{
string sysFile = typeof(Enumerable).Assembly.Location;
string sysDir = Directory.GetParent(sysFile).FullName;
List<MetadataReference> references = new List<MetadataReference>();
references.Add(MetadataReference.CreateFromFile(Path.Combine(sysDir, "System.dll")));
references.Add(MetadataReference.CreateFromFile(Path.Combine(sysDir, "System.Data.dll")));
references.Add(MetadataReference.CreateFromFile(Path.Combine(sysDir, "System.Xml.dll")));
StringBuilder code = new StringBuilder(); //创建代码串
/*
*
*/
code.Append("using System; \n");
code.Append("using System.Data; \n");
code.Append("using System.Data.SqlClient; \n");
code.Append("using System.Data.OleDb; \n");
code.Append("using System.Xml; \n");
code.Append("namespace SSEC.Math { \n"); //生成代码的命名空间为EvalGuy和本代码一样
code.Append(" public class _Evaluator { \n"); //产生 _Evaluator 类,所有可执行代码均在此类中运行
foreach (EvaluatorItem item in items) //遍历每一个可执行字符串项
{
code.AppendFormat(" public {0} {1}() ", //添加定义公共函数代码
item.ReturnType.Name, //函数返回值为可执行字符串项中定义的返回值类型
item.Name); //函数名称为可执行字符串项中定义的执行字符串名称
code.Append("{ "); //添加函数开始括号
code.AppendFormat("return ({0});", item.Expression);//添加函数体,返回可执行字符串项中定义的表达式的值
code.Append("} \n"); //添加函数结束括号
}
code.Append("}}"); //添加类结束和命名空间结束括号
string assemblyName = "SSEC.Math";
SyntaxTree tree = SyntaxFactory.ParseSyntaxTree(code.ToString());
CSharpCompilation compilation = CSharpCompilation.Create(assemblyName);
compilation.WithOptions(
new CSharpCompilationOptions(
OutputKind.DynamicallyLinkedLibrary
, usings: null
, optimizationLevel: OptimizationLevel.Debug
, checkOverflow: false
, allowUnsafe: true
, platform: Platform.AnyCpu
, warningLevel: 4
, xmlReferenceResolver: null)
);
compilation.AddReferences(references);
compilation.AddSyntaxTrees(tree);
using (var ms = new MemoryStream())
{
EmitResult result = compilation.Emit(ms);
if (!result.Success)
{
IEnumerable<Diagnostic> failures = result.Diagnostics.Where(diagnostic =>
diagnostic.IsWarningAsError ||
diagnostic.Severity == DiagnosticSeverity.Error);
foreach (Diagnostic diagnostic in failures)
{
Console.Error.WriteLine("\t{0}: {1}", diagnostic.Id, diagnostic.GetMessage());
}
}
else
{
ms.Seek(0, SeekOrigin.Begin);
Assembly assembly = AssemblyLoadContext.Default.LoadFromStream(ms);
//var type = assembly.GetTypes().Where(x => x.IsImplementlInterface(typeof(IProtocolExecutor))).FirstOrDefault();
//_Compiled=(IProtocolExecutor)Activator.CreateInstance(type, newProtocol.ProtocolID, newProtocol.Version); //实例化解析类
_Compiled = assembly.CreateInstance("SSEC.Math._Evaluator");
}
}
}
#endregion
#region
/// <summary>
/// 执行字符串并返回整型值
/// </summary>
/// <param name="name">执行字符串名称</param>
/// <returns>执行结果</returns>
public int EvaluateInt(string name)
{
return (int)Evaluate(name);
}
/// <summary>
/// 执行字符串并返回双精度值
/// </summary>
/// <param name="name">执行字符串名称</param>
/// <returns>执行结果</returns>
public double EvaluateDouble(string name)
{
return (double)Evaluate(name);
}
/// <summary>
/// 执行字符串并返回长整型数值
/// </summary>
/// <param name="name">执行字符串名称</param>
/// <returns>执行结果</returns>
public long EvaluateLong(string name)
{
return (long)Evaluate(name);
}
/// <summary>
/// 执行字符串并返回十进制数值
/// </summary>
/// <param name="name">执行字符串名称</param>
/// <returns>执行结果</returns>
public decimal EvaluateDecimal(string name)
{
return (decimal)Evaluate(name);
}
/// <summary>
/// 执行字符串并返回字符串型值
/// </summary>
/// <param name="name">执行字符串名称</param>
/// <returns>执行结果</returns>
public string EvaluateString(string name)
{
return (string)Evaluate(name);
}
/// <summary>
/// 执行字符串并返回布尔型值
/// </summary>
/// <param name="name">执行字符串名称</param>
/// <returns>执行结果</returns>
public bool EvaluateBool(string name)
{
return (bool)Evaluate(name);
}
/// <summary>
/// 执行字符串并返 object 型值
/// </summary>
/// <param name="name">执行字符串名称</param>
/// <returns>执行结果</returns>
public object Evaluate(string name)
{
MethodInfo mi = _Compiled.GetType().GetMethod(name);//获取 _Compiled 所属类型中名称为 name 的方法的引用
return mi.Invoke(_Compiled, null); //执行 mi 所引用的方法
}
#endregion
#region
/// <summary>
/// 执行表达式并返回整型值
/// </summary>
/// <param name="code">要执行的表达式</param>
/// <returns>运算结果</returns>
static public int EvaluateToInteger(string code)
{
MyEvaluator eval = new MyEvaluator(typeof(int), code, staticMethodName);//生成 Evaluator 类的对像
return (int)eval.Evaluate(staticMethodName); //执行并返回整型数据
}
/// <summary>
/// 执行表达式并返回双精度值
/// </summary>
/// <param name="name">执行字符串名称</param>
/// <returns>执行结果</returns>
static public double EvaluateToDouble(string code)
{
MyEvaluator eval = new MyEvaluator(typeof(double), code, staticMethodName);//生成 Evaluator 类的对像
return (double)eval.Evaluate(staticMethodName);
}
/// <summary>
/// 执行表达式并返回长整型数值
/// </summary>
/// <param name="name">执行字符串名称</param>
/// <returns>执行结果</returns>
static public long EvaluateToLong(string code)
{
MyEvaluator eval = new MyEvaluator(typeof(long), code, staticMethodName);//生成 Evaluator 类的对像
return (long)eval.Evaluate(staticMethodName);
}
/// <summary>
/// 执行表达式并返回十进制数值
/// </summary>
/// <param name="name">执行字符串名称</param>
/// <returns>执行结果</returns>
static public decimal EvaluateToDecimal(string code)
{
MyEvaluator eval = new MyEvaluator(typeof(decimal), code, staticMethodName);//生成 Evaluator 类的对像
return (decimal)eval.Evaluate(staticMethodName);
}
/// <summary>
/// 执行表达式并返回字符串型值
/// </summary>
/// <param name="code">要执行的表达式</param>
/// <returns>运算结果</returns>
static public string EvaluateToString(string code)
{
MyEvaluator eval = new MyEvaluator(typeof(string), code, staticMethodName);//生成 Evaluator 类的对像
return (string)eval.Evaluate(staticMethodName); //执行并返回字符串型数据
}
/// <summary>
/// 执行表达式并返回布尔型值
/// </summary>
/// <param name="code">要执行的表达式</param>
/// <returns>运算结果</returns>
static public bool EvaluateToBool(string code)
{
MyEvaluator eval = new MyEvaluator(typeof(bool), code, staticMethodName);//生成 Evaluator 类的对像
return (bool)eval.Evaluate(staticMethodName); //执行并返回布尔型数据
}
/// <summary>
/// 执行表达式并返回 object 型值
/// </summary>
/// <param name="code">要执行的表达式</param>
/// <returns>运算结果</returns>
static public object EvaluateToObject(string code)
{
MyEvaluator eval = new MyEvaluator(typeof(object), code, staticMethodName);//生成 Evaluator 类的对像
return eval.Evaluate(staticMethodName); //执行并返回 object 型数据
}
#endregion
#region
/// <summary>
/// 静态方法的执行字符串名称
/// </summary>
private const string staticMethodName = "__foo";
/// <summary>
/// 用于动态引用生成的类,执行其内部包含的可执行字符串
/// </summary>
private object _Compiled = null;
#endregion
}
/// <summary>
/// 可执行字符串项(即一条可执行字符串)
/// </summary>
public class EvaluatorItem
{
/// <summary>
/// 返回值类型
/// </summary>
public Type ReturnType;
/// <summary>
/// 执行表达式
/// </summary>
public string Expression;
/// <summary>
/// 执行字符串名称
/// </summary>
public string Name;
/// <summary>
/// 可执行字符串项构造函数
/// </summary>
/// <param name="returnType">返回值类型</param>
/// <param name="expression">执行表达式</param>
/// <param name="name">执行字符串名称</param>
public EvaluatorItem(Type returnType, string expression, string name)
{
ReturnType = returnType;
Expression = expression;
Name = name;
}
}
}