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using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp.Scripting;
using Microsoft.CodeAnalysis.Scripting;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace Tango.Scripting
{
/// <summary>
/// Represents a C# scripting engine capable of executing C# scripts using the Roslyn engine.
/// </summary>
public class ScriptEngine
{
private CancellationTokenSource _cancaller;
private OnExecuteParameters _onExecuteParameters;
public List<Type> ReferencedAssemblies { get; private set; }
/// <summary>
/// Initializes a new instance of the <see cref="ScriptEngine"/> class.
/// </summary>
/// <param name="parameters">The parameters.</param>
public ScriptEngine(OnExecuteParameters parameters)
{
_onExecuteParameters = parameters;
ReferencedAssemblies = new List<Type>();
}
/// <summary>
/// Runs the specified code.
/// </summary>
/// <param name="code">The code.</param>
/// <returns></returns>
public async Task Run(String code, String workingFolder)
{
try
{
code = ReplaceIncludes(code, workingFolder);
}
catch (Exception ex)
{
throw ex;
}
var options = CreateOptions();
String methodParameters = CreateMethodParameters();
_cancaller = new CancellationTokenSource();
await CSharpScript.RunAsync(
code +
Environment.NewLine +
Environment.NewLine +
"await Task.Factory.StartNew(() => { OnExecute(" + methodParameters + "); });", options: options, globals: _onExecuteParameters, cancellationToken: _cancaller.Token);
}
public Task<List<CompilerError>> Compile(String code, String workingFolder)
{
return Task.Factory.StartNew<List<CompilerError>>(() =>
{
try
{
code = ReplaceIncludes(code, workingFolder);
}
catch (Exception ex)
{
return new List<CompilerError>() { new CompilerError() { Error = ex.Message } };
}
var options = CreateOptions();
String methodParameters = CreateMethodParameters();
_cancaller = new CancellationTokenSource();
var script = CSharpScript.Create(
code +
Environment.NewLine +
Environment.NewLine +
"await Task.Factory.StartNew(() => { OnExecute(" + methodParameters + "); });", options: options, globalsType: _onExecuteParameters.GetType());
var results = script.Compile();
return results.Where(x => x.Severity == DiagnosticSeverity.Error).ToList().Select(x => new CompilerError() { Error = x.ToString() }).ToList();
});
}
private String CreateMethodParameters()
{
return String.Join(", ", _onExecuteParameters.GetType().GetFields(BindingFlags.Public | BindingFlags.Instance).Select(x => x.Name));
}
private String ReplaceIncludes(String code, String workingFolder)
{
if (Directory.Exists(workingFolder))
{
Environment.CurrentDirectory = workingFolder;
}
List<String> lines = code.ToLines();
for (int i = 0; i < lines.Count; i++)
{
var line = lines[i];
if (line.Trim().StartsWith("include"))
{
String path = line.Replace("include", "").Trim().Replace("\"", "");
if (!File.Exists(path))
{
throw new FileNotFoundException("Could not locate include file '" + path + "'.");
}
String content = ReplaceIncludes(File.ReadAllText(path), Path.GetDirectoryName(path));
if (content.Contains("OnExecute("))
{
throw new InvalidProgramException(String.Format("Include file '{0}' contains and OnExecute method. Please remove it before trying to compile.", path));
}
lines[i] = content;
}
}
code = ClearnUsings(String.Join(Environment.NewLine, lines));
return code;
}
private String ClearnUsings(String code)
{
List<String> usings = new List<string>();
List<String> lines = code.ToLines();
foreach (var line in lines)
{
if (line.Trim().StartsWith("using"))
{
usings.Add(line);
}
}
lines.RemoveAll(x => x.Trim().StartsWith("using"));
return String.Join(Environment.NewLine, usings.Distinct()) + String.Join(Environment.NewLine, lines);
}
private ScriptOptions CreateOptions()
{
//My References.
var options = ScriptOptions.Default;
//My Assemblies.
options = options.AddReferences(typeof(Form).Assembly.Location);
options = options.AddReferences(typeof(Enumerable).Assembly.Location);
options = options.AddReferences(typeof(ScriptEngine).Assembly.Location);
foreach (var asm in ReferencedAssemblies)
{
options = options.AddReferences(asm.Assembly.Location);
}
//Imports.
options = options.AddImports(
"System",
"System.Collections.Generic",
"System.Linq",
"System.Text",
"System.Diagnostics",
"System.Windows.Forms"
);
return options;
}
/// <summary>
/// Stops this instance.
/// </summary>
public void Stop()
{
_cancaller.Cancel();
}
}
}
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