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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.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace Tango.Scripting
{
public class ScriptingEngine : IScriptingEngine
{
private class IncludeResult
{
public String File { get; set; }
public List<String> Lines { get; set; }
}
public Task<String> Compile(Script script)
{
return Task.Factory.StartNew<String>(() =>
{
String code = script.Code;
List<IncludeResult> includeResults = new List<IncludeResult>();
try
{
includeResults.Add(new IncludeResult() { File = script.File, Lines = script.Code.ToLines() });
code = ReplaceIncludes(script, code, script.WorkingFolder, includeResults);
}
catch (Exception ex)
{
throw new CompilationException(new CompilationError() { Message = ex.Message });
}
var options = CreateOptions(script);
var csharpScript = CSharpScript.Create(code, options: options, globalsType: script.GlobalObject.GetType());
var results = csharpScript.Compile();
List<CompilationError> errors = new List<CompilationError>();
foreach (var result in results.Where(x => x.Severity == DiagnosticSeverity.Error))
{
CompilationError error = new CompilationError();
error.Message = result.GetMessage();
error.Character = result.Location.GetMappedLineSpan().StartLinePosition.Character + 1;
int lineIndex = 0;
IncludeResult include = null;
foreach (var inc in includeResults)
{
for (int i = 0; i < inc.Lines.Count; i++)
{
if (inc.Lines[i] == code.ToLines()[result.Location.GetMappedLineSpan().StartLinePosition.Line])
{
include = inc;
lineIndex = i;
break;
}
}
}
if (include != null)
{
error.File = include.File;
error.Line = lineIndex + 1;
}
errors.Add(error);
}
if (errors.Count > 0)
{
throw new CompilationException(errors.ToArray());
}
return code;
});
}
public Task<ScriptSession> Run(Script script)
{
return Task.Factory.StartNew<ScriptSession>(() =>
{
var effectivCode = Compile(script).Result;
var options = CreateOptions(script);
var _cancaller = new CancellationTokenSource();
Thread scriptThread = null;
ScriptSession session = null;
session = new ScriptSession(script, effectivCode, () =>
{
scriptThread.Abort();
});
scriptThread = new Thread(() =>
{
try
{
var result = CSharpScript.RunAsync(effectivCode, options: options, globals: script.GlobalObject, cancellationToken: _cancaller.Token).Result;
session.Completed(result.ReturnValue);
}
catch (ThreadAbortException)
{
}
catch (Exception ex)
{
session.Failed(ex.InnerException);
}
});
scriptThread.SetApartmentState(script.ApartmentState);
scriptThread.IsBackground = true;
scriptThread.Start();
return session;
});
}
public void Dispose()
{
throw new NotImplementedException();
}
#region Private Methods
private List<String> GetIncludes(String code, String workingFolder)
{
if (Directory.Exists(workingFolder))
{
Environment.CurrentDirectory = workingFolder;
}
List<String> lines = code.ToLines();
List<String> includeFiles = new List<string>();
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 + "'.");
}
includeFiles.Add(path);
}
}
return includeFiles;
}
private String ReplaceIncludes(Script script, String code, String workingFolder, List<IncludeResult> includeResults)
{
if (Directory.Exists(workingFolder))
{
Environment.CurrentDirectory = workingFolder;
}
List<String> lines = code.ToLines().ToList();
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 includeContent = File.ReadAllText(path);
includeResults.Add(new IncludeResult() { File = path, Lines = includeContent.ToLines() });
String content = ReplaceIncludes(script, includeContent, Path.GetDirectoryName(path), includeResults);
if (!String.IsNullOrWhiteSpace(script.EntryPoint))
{
if (content.Contains(script.EntryPoint + "("))
{
throw new InvalidProgramException(String.Format("Include file '{0}' contains an OnExecute method. Please remove it before trying to compile.", path));
}
}
lines[i] = content;
}
}
code = ClearUsings(String.Join(Environment.NewLine, lines));
return code;
}
private String ClearUsings(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()) + Environment.NewLine + String.Join(Environment.NewLine, lines);
}
private ScriptOptions CreateOptions(Script script)
{
//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(ScriptingEngine).Assembly.Location);
foreach (var asm in script.ReferenceAssemblies)
{
options = options.AddReferences(asm.File);
}
//Imports.
options = options.AddImports(
"System",
"System.Collections.Generic",
"System.Linq",
"System.Text",
"System.Diagnostics",
"System.Windows.Forms",
"System.Threading"
);
if (script.Imports.Count > 0)
{
options = options.AddImports(script.Imports);
}
return options;
}
#endregion
}
}
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