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ScriptExecutor.cs
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264 lines (218 loc) · 9.71 KB
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using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.IO;
using System.Linq;
using System.Reflection;
using ScriptCs.Contracts;
namespace ScriptCs
{
public class ScriptExecutor : IScriptExecutor
{
private readonly ILog _log;
public static readonly string[] DefaultReferences =
{
"System",
"System.Core",
"System.Data",
"System.Data.DataSetExtensions",
"System.Xml",
"System.Xml.Linq",
"System.Net.Http",
"Microsoft.CSharp",
typeof(ScriptExecutor).Assembly.Location,
typeof(IScriptEnvironment).Assembly.Location
};
public static readonly string[] DefaultNamespaces =
{
"System",
"System.Collections.Generic",
"System.Linq",
"System.Text",
"System.Threading.Tasks",
"System.IO",
"System.Net.Http",
"System.Dynamic"
};
private const string ScriptLibrariesInjected = "ScriptLibrariesInjected";
public IFileSystem FileSystem { get; private set; }
public IFilePreProcessor FilePreProcessor { get; private set; }
public IScriptEngine ScriptEngine { get; private set; }
public AssemblyReferences References { get; private set; }
public IReadOnlyCollection<string> Namespaces { get; private set; }
public ScriptPackSession ScriptPackSession { get; protected set; }
public IScriptLibraryComposer ScriptLibraryComposer { get; protected set; }
public IScriptInfo ScriptInfo { get; protected set; }
public ScriptExecutor(
IFileSystem fileSystem, IFilePreProcessor filePreProcessor, IScriptEngine scriptEngine, ILogProvider logProvider, IScriptInfo scriptInfo)
: this(fileSystem, filePreProcessor, scriptEngine, logProvider, new NullScriptLibraryComposer(), scriptInfo)
{
}
public ScriptExecutor(
IFileSystem fileSystem,
IFilePreProcessor filePreProcessor,
IScriptEngine scriptEngine,
ILogProvider logProvider,
IScriptLibraryComposer composer,
IScriptInfo scriptInfo)
{
Guard.AgainstNullArgument("fileSystem", fileSystem);
Guard.AgainstNullArgumentProperty("fileSystem", "BinFolder", fileSystem.BinFolder);
Guard.AgainstNullArgumentProperty("fileSystem", "DllCacheFolder", fileSystem.DllCacheFolder);
Guard.AgainstNullArgument("filePreProcessor", filePreProcessor);
Guard.AgainstNullArgument("scriptEngine", scriptEngine);
Guard.AgainstNullArgument("logProvider", logProvider);
Guard.AgainstNullArgument("composer", composer);
Guard.AgainstNullArgument("scriptInfo", scriptInfo);
References = new AssemblyReferences(new[] { GetAssemblyFromName("System.Runtime") }, DefaultReferences);
Namespaces = new ReadOnlyCollection<string>(DefaultNamespaces);
FileSystem = fileSystem;
FilePreProcessor = filePreProcessor;
ScriptEngine = scriptEngine;
_log = logProvider.ForCurrentType();
ScriptLibraryComposer = composer;
ScriptInfo = scriptInfo;
}
public virtual void ImportNamespaces(params string[] namespaces)
{
Guard.AgainstNullArgument("namespaces", namespaces);
Namespaces = new ReadOnlyCollection<string>(Namespaces.Union(namespaces).ToArray());
}
public virtual void RemoveNamespaces(params string[] namespaces)
{
Guard.AgainstNullArgument("namespaces", namespaces);
Namespaces = new ReadOnlyCollection<string>(Namespaces.Except(namespaces).ToArray());
}
public virtual void AddReferences(params Assembly[] assemblies)
{
Guard.AgainstNullArgument("assemblies", assemblies);
References = References.Union(assemblies);
}
public virtual void RemoveReferences(params Assembly[] assemblies)
{
Guard.AgainstNullArgument("assemblies", assemblies);
References = References.Except(assemblies);
}
public virtual void AddReferences(params string[] paths)
{
Guard.AgainstNullArgument("paths", paths);
References = References.Union(paths);
}
public virtual void RemoveReferences(params string[] paths)
{
Guard.AgainstNullArgument("paths", paths);
References = References.Except(paths);
}
public virtual void Initialize(
IEnumerable<string> paths, IEnumerable<IScriptPack> scriptPacks, params string[] scriptArgs)
{
AddReferences(paths.ToArray());
var bin = Path.Combine(FileSystem.CurrentDirectory, FileSystem.BinFolder);
var cache = Path.Combine(FileSystem.CurrentDirectory, FileSystem.DllCacheFolder);
ScriptEngine.BaseDirectory = bin;
ScriptEngine.CacheDirectory = cache;
_log.Debug("Initializing script packs");
var scriptPackSession = new ScriptPackSession(scriptPacks, scriptArgs);
ScriptPackSession = scriptPackSession;
scriptPackSession.InitializePacks();
}
public virtual void Reset()
{
References = new AssemblyReferences(DefaultReferences);
Namespaces = new ReadOnlyCollection<string>(DefaultNamespaces);
ScriptPackSession.State.Clear();
}
public virtual void Terminate()
{
_log.Debug("Terminating packs");
ScriptPackSession.TerminatePacks();
}
public virtual ScriptResult Execute(string script, params string[] scriptArgs)
{
var path = Path.IsPathRooted(script) ? script : Path.Combine(FileSystem.CurrentDirectory, script);
var result = FilePreProcessor.ProcessFile(path);
ScriptEngine.FileName = Path.GetFileName(path);
ScriptInfo.ScriptPath = Path.GetFullPath(path);
return EngineExecute(Path.GetDirectoryName(path), scriptArgs, result);
}
public virtual ScriptResult ExecuteScript(string script, params string[] scriptArgs)
{
var result = FilePreProcessor.ProcessScript(script);
return EngineExecute(FileSystem.CurrentDirectory, scriptArgs, result);
}
protected internal virtual ScriptResult EngineExecute(
string workingDirectory,
string[] scriptArgs,
FilePreProcessorResult result
)
{
InjectScriptLibraries(workingDirectory, result, ScriptPackSession.State);
var namespaces = Namespaces.Union(result.Namespaces);
var references = References.Union(result.References);
ScriptInfo.ScriptPath = result.ScriptPath;
foreach (var loadedScript in result.LoadedScripts)
{
ScriptInfo.LoadedScripts.Add(loadedScript);
}
_log.Debug("Starting execution in engine");
return ScriptEngine.Execute(result.Code, scriptArgs, references, namespaces, ScriptPackSession);
}
protected internal virtual void InjectScriptLibraries(
string workingDirectory,
FilePreProcessorResult result,
IDictionary<string, object> state
)
{
Guard.AgainstNullArgument("result", result);
Guard.AgainstNullArgument("state", state);
if (state.ContainsKey(ScriptLibrariesInjected))
{
return;
}
var scriptLibrariesPreProcessorResult = LoadScriptLibraries(workingDirectory);
// script libraries should be injected just before the #line directive
// if there is no #line directive, they can be injected at the beginning of code
if (result.Code == null) result.Code = string.Empty;
var safeInsertIndex = result.Code.IndexOf("#line");
if (safeInsertIndex < 0) safeInsertIndex = 0;
if (scriptLibrariesPreProcessorResult != null)
{
result.Code = result.Code.Insert(safeInsertIndex, scriptLibrariesPreProcessorResult.Code + Environment.NewLine
+ "Env.Initialize();" + Environment.NewLine);
result.References.AddRange(scriptLibrariesPreProcessorResult.References);
result.Namespaces.AddRange(scriptLibrariesPreProcessorResult.Namespaces);
}
else
{
result.Code = result.Code.Insert(safeInsertIndex, "Env.Initialize();" + Environment.NewLine);
}
state.Add(ScriptLibrariesInjected, null);
}
protected internal virtual FilePreProcessorResult LoadScriptLibraries(string workingDirectory)
{
if (string.IsNullOrWhiteSpace(ScriptLibraryComposer.ScriptLibrariesFile))
{
return null;
}
var scriptLibrariesPath = Path.Combine(workingDirectory, FileSystem.PackagesFolder,
ScriptLibraryComposer.ScriptLibrariesFile);
if (FileSystem.FileExists(scriptLibrariesPath))
{
_log.DebugFormat("Found Script Library at {0}", scriptLibrariesPath);
return FilePreProcessor.ProcessFile(scriptLibrariesPath);
}
return null;
}
private static Assembly GetAssemblyFromName(string assemblyName)
{
try
{
return Assembly.Load(new AssemblyName(assemblyName));
}
catch
{
return null;
}
}
}
}