// Wyam - Use the Roslyn scripting engine for compilation
// In MVC, this part is done in RoslynCompilationService
private Type Compile([NotNull] RelativeFileInfo file, [NotNull] string compilationContent)
{
HashSet <Assembly> assemblies = new HashSet <Assembly>(new AssemblyEqualityComparer())
{
Assembly.GetAssembly(typeof(Wyam.Razor.Razor)) // Wyam.Razor
};
if (_executionContext.Assemblies != null)
{
assemblies.UnionWith(_executionContext.Assemblies);
}
var assemblyName = Path.GetRandomFileName();
var parseOptions = new CSharpParseOptions();
var syntaxTree = CSharpSyntaxTree.ParseText(SourceText.From(compilationContent, Encoding.UTF8), parseOptions, assemblyName);
var compilationOptions = new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary);
var assemblyPath = Path.GetDirectoryName(typeof(object).Assembly.Location);
var metadataReferences = assemblies
.Where(x => !x.IsDynamic && !string.IsNullOrEmpty(x.Location))
.Select(x => _metadataReferences.GetOrAdd(x.Location, y => MetadataReference.CreateFromFile(y)));
var compilation = CSharpCompilation.Create(assemblyName, new[] { syntaxTree }, metadataReferences, compilationOptions)
.AddReferences(
// For some reason, Roslyn really wants these added by filename
// See http://stackoverflow.com/questions/23907305/roslyn-has-no-reference-to-system-runtime
_metadataReferences.GetOrAdd(Path.Combine(assemblyPath, "mscorlib.dll"), x => MetadataReference.CreateFromFile(x)),
_metadataReferences.GetOrAdd(Path.Combine(assemblyPath, "System.dll"), x => MetadataReference.CreateFromFile(x)),
_metadataReferences.GetOrAdd(Path.Combine(assemblyPath, "System.Core.dll"), x => MetadataReference.CreateFromFile(x)),
_metadataReferences.GetOrAdd(Path.Combine(assemblyPath, "System.Runtime.dll"), x => MetadataReference.CreateFromFile(x))
);
if (_executionContext.DynamicAssemblies.Count > 0)
{
compilation = compilation.AddReferences(_executionContext.DynamicAssemblies.Select(x => MetadataReference.CreateFromImage(x)));
}
using (var ms = new MemoryStream())
{
EmitResult result = compilation.Emit(ms);
if (!result.Success)
{
Trace.Error("{0} errors compiling {1}:{2}{3}", result.Diagnostics.Length, file.RelativePath, Environment.NewLine, string.Join(Environment.NewLine, result.Diagnostics));
throw new AggregateException(result.Diagnostics.Select(x => new Exception(x.ToString())));
}
ms.Seek(0, SeekOrigin.Begin);
byte[] assemblyBytes = ms.ToArray();
Assembly assembly = Assembly.Load(assemblyBytes);
var type = assembly.GetExportedTypes().First(t => t.Name.StartsWith(_razorHost.MainClassNamePrefix, StringComparison.Ordinal));
return(type);
}
}
/// <inheritdoc />
public Type Compile([NotNull] RelativeFileInfo file)
{
GeneratorResults results;
using (var inputStream = file.FileInfo.CreateReadStreamWithRetry())
{
results = GenerateCode(file.RelativePath, inputStream);
}
if (!results.Success)
{
Trace.Error("{0} errors parsing {1}:{2}{3}", results.ParserErrors.Count(), file.RelativePath, Environment.NewLine, string.Join(Environment.NewLine, results.ParserErrors));
throw new AggregateException(results.ParserErrors.Select(x => new Exception(x.Message)));
}
return(Compile(file, results.GeneratedCode));
}
public IRazorPage CreateInstance([NotNull] string relativePath, Stream stream)
{
if (relativePath.StartsWith("~/", StringComparison.Ordinal))
{
// For tilde slash paths, drop the leading ~ to make it work with the underlying IFileProvider.
relativePath = relativePath.Substring(1);
}
// Code below is taken from CompilerCache (specifically OnCacheMiss) which is responsible for managing the compilation step in MVC
// Check the file
var fileProvider = stream == null ? (IFileProvider)_fileProvider : new WyamStreamFileProvider(_fileProvider, stream);
var fileInfo = fileProvider.GetFileInfo(relativePath);
if (!fileInfo.Exists)
{
return null;
}
// If relative path is the root, it probably means this isn't from reading a file so don't bother with caching
IExecutionCache cache = relativePath == "/" ? null : _executionContext.ExecutionCache;
string key = null;
Type pageType = null;
if (cache != null)
{
key = relativePath + " " + RazorFileHash.GetHash(fileInfo);
if (!cache.TryGetValue(key, out pageType))
{
pageType = null;
}
}
// Compile and store in cache if not found
if (pageType == null)
{
var relativeFileInfo = new RelativeFileInfo(fileInfo, relativePath);
pageType = _razorcompilationService.Compile(relativeFileInfo);
cache?.Set(key, pageType);
}
// Create an return a new page instance
IRazorPage page = (IRazorPage)Activator.CreateInstance(pageType);
page.Path = relativePath;
return page;
}
