private Editor()
{
shadowClass = new ShadowClass();
contexts = new Contexts(shadowClass);
codeLexer = new CodeLexer(contexts);
templateLexer = new TemplateLexer(contexts);
}
public static Type Compile(ShadowClass shadowClass)
{
if (Directory.Exists(Constants.TempDirectory) == false)
{
Directory.CreateDirectory(Constants.TempDirectory);
}
var filname = Path.GetRandomFileName();
var path = Path.Combine(Constants.TempDirectory, filname);
var result = shadowClass.Compile(path);
if (result.Success)
return Assembly.LoadFrom(path).GetTypes().FirstOrDefault();
var errors = result.Diagnostics.Where(diagnostic => diagnostic.IsWarningAsError || diagnostic.Severity == DiagnosticSeverity.Error);
foreach (var error in errors)
{
var message = error.GetMessage();
message = message.Replace("__Typewriter.", string.Empty);
message = message.Replace("__Code.", string.Empty);
message = message.Replace("publicstatic", string.Empty);
Log.Error("Template error: {0} {1}", error.Id, message);
}
throw new Exception("Failed to compile template.");
}
public static string Parse(string template, List<Type> extensions)
{
if (string.IsNullOrWhiteSpace(template)) return null;
var output = string.Empty;
var stream = new Stream(template);
var shadowClass = new ShadowClass();
var contexts = new Contexts(shadowClass);
shadowClass.Clear();
while (stream.Advance())
{
if (ParseCodeBlock(stream, shadowClass)) continue;
if (ParseLambda(stream, shadowClass, contexts, ref output)) continue;
output += stream.Current;
}
shadowClass.Parse();
extensions.Clear();
extensions.Add(Compiler.Compile(shadowClass));
extensions.AddRange(FindExtensionClasses(shadowClass));
return output;
}
public Contexts(ShadowClass shadowClass)
{
var assembly = typeof(ContextAttribute).Assembly;
ParseCodeModel(assembly);
ParseExtensions(shadowClass);
}
private static void ParseCode(Stream stream, ShadowClass shadowClass)
{
var code = new StringBuilder();
do
{
code.Append(stream.Current);
}
while (stream.Advance());
shadowClass.AddBlock(code.ToString(), 0);
}
private static bool ParseLambda(Stream stream, ShadowClass shadowClass, ref string template)
{
if (stream.Current == '$')
{
var identifier = stream.PeekWord(1);
if (identifier != null)
{
var filter = stream.PeekBlock(identifier.Length + 2, '(', ')');
if (filter != null && stream.Peek(filter.Length + 2 + identifier.Length + 1) == '[')
{
try
{
var index = filter.IndexOf("=>", StringComparison.Ordinal);
if (index > 0)
{
var name = filter.Substring(0, index);
var contextName = identifier;
// Todo: Make the TemplateCodeParser context aware
if (contextName == "GenericTypeArguments") contextName = "Types";
else if (contextName.StartsWith("Nested")) contextName = contextName.Remove(0, 6);
var type = Contexts.Find(contextName)?.Type.FullName;
if (type == null) return false;
var methodIndex = counter++;
shadowClass.AddLambda(filter, type, name, methodIndex);
stream.Advance(filter.Length + 2 + identifier.Length);
template += $"${identifier}($__{methodIndex})";
return true;
}
}
catch
{
}
}
}
}
return false;
}
private static bool ParseCodeBlock(Stream stream, ShadowClass shadowClass)
{
if (stream.Current == '$' && stream.Peek() == '{')
{
stream.Advance();
var block = stream.PeekBlock(1, '{', '}');
var codeStream = new Stream(block, stream.Position + 1);
ParseUsings(codeStream, shadowClass);
ParseCode(codeStream, shadowClass);
stream.Advance(block.Length + 1);
return true;
}
return false;
}
private static IEnumerable<Type> FindExtensionClasses(ShadowClass shadowClass)
{
var types = new List<Type>();
var usings = shadowClass.Snippets.Where(s => s.Type == SnippetType.Using && s.Code.StartsWith("using"));
foreach (var usingStatement in usings.Select(u => u.Code))
{
var ns = usingStatement.Remove(0, 5).Trim().Trim(';');
foreach (var assembly in shadowClass.ReferencedAssemblies)
{
types.AddRange(assembly.GetExportedTypes().Where(t => t.Namespace == ns &&
t.GetMethods(BindingFlags.Static | BindingFlags.Public).Any(m =>
m.IsDefined(typeof (ExtensionAttribute), false) &&
m.GetParameters().First().ParameterType.Namespace == "Typewriter.CodeModel")));
}
}
return types;
}
private static void ParseUsings(Stream stream, ShadowClass shadowClass)
{
stream.Advance();
while (true)
{
stream.SkipWhitespace();
if ((stream.Current == 'u' && stream.PeekWord() == "using") || (stream.Current == '/' && stream.Peek() == '/'))
{
var line = stream.PeekLine();
shadowClass.AddUsing(line, stream.Position);
stream.Advance(line.Length);
continue;
}
break;
}
}
private void ParseExtensions(ShadowClass shadowClass)
{
foreach (var assembly in shadowClass.ReferencedAssemblies)
{
var methods = assembly.GetExportedTypes().SelectMany(t => t.GetMethods(BindingFlags.Static | BindingFlags.Public)
.Where(m => m.IsDefined(typeof (ExtensionAttribute), false) &&
m.GetParameters().First().ParameterType.Namespace == "Typewriter.CodeModel"));
foreach (var method in methods)
{
var parameters = method.GetParameters();
if (parameters.Count() != 1) continue;
var context = items.Values.FirstOrDefault(c => c.Type == parameters.First().ParameterType);
if (context != null)
{
var identifier = CreateIdentifier(method);
context.AddExtensionIdentifier(method.ReflectedType.Namespace, identifier);
}
}
}
}
public SemanticModel(ShadowClass shadowClass)
{
this.shadowClass = shadowClass;
}
