public Template Compile(string source)
{
Stack <CompilerContext> stack = new Stack <CompilerContext> ();
Tokenizer tokenizer = new Tokenizer(source);
Template template = new Template(InternalTags [@"template"]);
CompilerContext context = new CompilerContext
{
CurrentElement = template,
InConditionalPath = false
};
bool inPartial = false;
string currentPartial = String.Empty;
foreach (var token in tokenizer.Tokens.Where(token => !token.IsEmpty))
{
if (token.Type == TokenTypes.StaticText)
{
// Static content.
context.AddStatement(new StaticElement(token.Data, InternalTags [@"static"]));
}
else
{
// A moustache ...
if (token.Subtype == TokenSubtypes.BeginTag)
{
// A begin tag can be a conditional separator (#if -> #else).
bool isConditionalPath = false;
ITag tag = GetBestTag(token.TagName, out isConditionalPath);
if (isConditionalPath)
{
if (context.Tag == tag)
{
// We're switching to the conditional brach.
context.InConditionalPath = true;
}
else
{
throw new Exception(@"Syntax error. Unexpected conditional branch.");
}
}
else
{
// We're creating a new element.
IRenderable statement = InstantiateTag(tag, token.Arguments);
if (tag is IInlineTag)
{
context.AddStatement(statement);
}
else
{
stack.Push(context);
context = new CompilerContext
{
CurrentElement = statement,
InConditionalPath = false
};
}
}
}
else if (token.Subtype == TokenSubtypes.EndTag)
{
if (inPartial && token.TagName == currentPartial)
{
var element = context.CurrentElement as BlockElement;
context = stack.Pop();
template.Partials.Add(currentPartial, element);
inPartial = false;
currentPartial = String.Empty;
}
else
{
// We're closing a tag.
bool isConditionalPath = false;
ITag tag = GetBestTag(token.TagName, out isConditionalPath);
// It can't be a conditional branch.
if (isConditionalPath)
{
throw new Exception(@"Syntax error. Unexpected conditional branch.");
}
if (context.Tag == tag)
{
var element = context.CurrentElement;
context = stack.Pop();
context.AddStatement(element);
}
else
{
throw new Exception(@"Syntax error. Unexpected ending tag.");
}
}
}
else if (token.Subtype == TokenSubtypes.DeclarePartialTag)
{
if (inPartial)
{
throw new Exception(@"Syntax error. Nested partials are not allowed.");
}
stack.Push(context);
context = new CompilerContext
{
CurrentElement = new Template(InternalTags [@"template"]),
InConditionalPath = false
};
currentPartial = token.TagName;
inPartial = true;
}
else if (token.Subtype == TokenSubtypes.RenderPartialTag)
{
context.AddStatement(InstantiateTag(InternalTags [@"renderpartial"], token.Arguments.Prepend("partial", new StringArgument(token.TagName))));
}
else if (token.Subtype == TokenSubtypes.Variable)
{
context.AddStatement(new VariableElement(InternalTags [@"variable"], token.Type == TokenTypes.DoubleMustache)
{
Arguments = token.Arguments
});
}
}
}
// Validation.
if (stack.Count > 0 || context.Tag != InternalTags [@"template"])
{
throw new Exception(@"Syntax error. Unexpected end of template.");
}
return(template);
}