public static IEnumerable <IDocumentFunction> Parse(String str, IDocumentFunctionFactory factory)
{
var source = new StringSource(str);
var result = source.ParseDocumentFunctions(factory);
return(source.IsDone ? result : null);
}
public static IEnumerable <IDocumentFunction> ParseDocumentFunctions(this StringSource source, IDocumentFunctionFactory factory)
{
var functions = new List <IDocumentFunction>();
while (!source.IsDone)
{
var current = source.SkipSpacesAndComments();
if (functions.Count > 0)
{
if (current != Symbols.Comma)
{
return(null);
}
source.SkipCurrentAndSpaces();
}
var position = source.Index;
var uri = source.ParseUri();
var name = FunctionNames.Url;
var data = uri?.Path;
if (uri == null)
{
source.BackTo(position);
name = source.ParseIdent();
var start = source.Current;
if (name == null || start != Symbols.RoundBracketOpen)
{
return(null);
}
source.SkipCurrentAndSpaces();
data = source.ParseString();
var end = source.SkipSpacesAndComments();
if (end != Symbols.RoundBracketClose)
{
return(null);
}
source.SkipCurrentAndSpaces();
}
var function = factory.Create(name, data);
if (function == null)
{
return(null);
}
functions.Add(function);
}
return(functions);
}