private Node ParseElement()
{
if (Match(TokenType.Shorthand))
{
// Drop the leading "$".
string shorthand = Previous().Source.Substring(1);
if (shorthand.StartsWith("-") || shorthand.StartsWith(".-"))
{
History.ActivateLog();
}
return(new DynamicElement(shorthand, History, CyclicMatches));
}
if (Match(TokenType.Escape))
{
char source = Previous().Source[1];
switch (source)
{
case 'n': return(new Literal("\n"));
case '\n': return(new Literal("¶"));
default: return(new Literal(source.ToString()));
}
}
if (Match(TokenType.Literal))
{
return(new Literal(Previous().Source));
}
if (Match(TokenType.ElementOpen))
{
Node inner = ParseConcatenation();
// Consume the closing } if there is one.
Match(TokenType.ElementClose);
History.ActivateLog();
return(new DynamicElement(inner, History, CyclicMatches));
}
if (Match(TokenType.ConcatOpen))
{
bool length = Previous().Source[1] == '.';
Node inner = ParseConcatenation();
// Consume the closing } if there is one.
Match(TokenType.ConcatClose);
if (length)
{
return(new Length(inner));
}
else
{
return(inner);
}
}
throw new NoElementException();
}