---input---
%if defined(__foo__)
.cls {
  color: #fff;
}
%endif
%literal %foo

---tokens---
'%'           Comment.Preproc
'if'          Comment.Preproc
' '           Text
'defined'     Keyword
'('           Punctuation
'__foo__'     Name.Variable
')'           Punctuation
'\n'          Text

'.'           Punctuation
'cls'         Name.Class
' '           Text
'{'           Punctuation
'\n'          Text

'  '          Text
'color'       Keyword
':'           Punctuation
' '           Text
'#fff'        Literal.Number.Hex
';'           Punctuation
'\n'          Text

'}'           Punctuation
'\n'          Text

'%'           Comment.Preproc
'endif'       Comment.Preproc
'\n'          Text

'%'           Comment.Preproc
'literal'     Comment.Preproc
' %foo'       Text
'\n'          Text