public static bool PeekAndParse(CharStream cs, out FTL.AST.Pattern pattern)
{
// A quoted-pattern is the easiest to detect, so we'll try that first
if (cs.PeekNext() == '"')
{
pattern = ParseQuoted(cs);
return(true);
}
// it might still be an unquoted-pattern, but this is trickier to detect
// first let's try to detect a placeable and block-text
if (Placeable.Peek(cs) || AnyText.PeekBlockText(cs))
{
pattern = ParseUnquoted(cs);
return(true);
}
// if not any of the above, the only thing left is unquoted-text
int bufferPos = cs.Position;
WhiteSpace.Parse(cs);
char next = cs.PeekNext();
cs.Rewind(bufferPos);
if (!CharStream.IsEOF(next) && !CharStream.IsNL(next))
{
pattern = ParseUnquoted(cs);
return(true);
}
pattern = null;
return(false);
}