private static bool ParseCodeBlock(Stream stream, ShadowClass shadowClass)
{
if (stream.Current == '$' && stream.Peek() == '{')
{
for (var i = 0; ; i--)
{
var current = stream.Peek(i);
if (current == '`' || (current == '/' && stream.Peek(i - 1) == '/'))
{
return(false);
}
if (current == '\n' || current == char.MinValue)
{
break;
}
}
stream.Advance();
var block = stream.PeekBlock(1, '{', '}');
var codeStream = new Stream(block, stream.Position + 1);
ParseUsings(codeStream, shadowClass);
ParseCode(codeStream, shadowClass);
stream.Advance(block.Length + 1);
return(true);
}
return(false);
}
internal void AddBrace(Stream stream, string classification = Classifications.Operator)
{
var brace = stream.Current;
if (brace == '{' || brace == '[' || brace == '(' || brace == ')' || brace == ']' || brace == '}')
{
var token = new Token { Classification = classification, Start = stream.Position, Length = 1 };
if (brace == '{' || brace == '[' || brace == '(')
{
token.IsOpen = true;
braces.Push(token, stream.Current);
}
else
{
var match = braces.Pop(brace);
if (match != null)
{
token.MatchingToken = match;
match.MatchingToken = token;
}
}
Add(token);
}
}
private static bool ParseReference(Stream stream, ShadowClass shadowClass, ProjectItem templateProjectItem)
{
const string keyword = "reference";
if (stream.Current == '#' && stream.Peek() == keyword[0] && stream.PeekWord(1) == keyword)
{
var reference = stream.PeekLine(keyword.Length + 1);
if (reference != null)
{
var len = reference.Length + keyword.Length + 1;
reference = reference.Trim('"', ' ', '\n', '\r');
try
{
if (reference.EndsWith(".dll", StringComparison.OrdinalIgnoreCase))
{
reference = PathResolver.ResolveRelative(reference, templateProjectItem);
}
shadowClass.AddReference(reference);
return(true);
}
catch (Exception ex)
{
Log.Error("Reference Error: " + ex);
}
finally
{
stream.Advance(len - 1);
}
}
}
return(false);
}
private static bool ParseLambda(Stream stream, ShadowClass shadowClass, Contexts contexts, ref string template)
{
if (stream.Current == '$')
{
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 == "TypeArguments")
{
contextName = "Types";
}
else if (contextName.StartsWith("Nested", StringComparison.OrdinalIgnoreCase))
{
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 void ParseCode(Stream stream, ShadowClass shadowClass)
{
var code = new StringBuilder();
do
{
if (stream.Current != char.MinValue)
{
code.Append(stream.Current);
}
}while (stream.Advance());
shadowClass.AddBlock(code.ToString(), 0);
}
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;
}
}
public static string Parse(ProjectItem templateProjectItem, 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 (ParseReference(stream, shadowClass, templateProjectItem))
{
continue;
}
if (ParseCodeBlock(stream, shadowClass))
{
continue;
}
if (ParseLambda(stream, shadowClass, contexts, ref output))
{
continue;
}
output += stream.Current;
}
shadowClass.Parse();
extensions.Clear();
extensions.Add(Compiler.Compile(templateProjectItem, shadowClass));
extensions.AddRange(FindExtensionClasses(shadowClass));
return(output);
}