anchor.diff:  
   WS
   :
  -   F_WhitespaceChar+ -> channel(HIDDEN)
  +   F_WhitespaceChar+ -> channel ( HIDDEN )
   ;
   
   fragment
  
positive.code:    ','
  ;
  
  HASH
  :
     '#' -> pushMode(M_COMMENT), channel(HIDDEN)
  ;
  
  NEWLINE
  :
     F_NewlineChar+
  ;
  
  VARIABLE
  
negative.code: :
     [ \t\u000C]
  ;
  
  mode M_COMMENT;
  
  M_COMMENT_COMMENT
  :
     F_NonNewlineChar+ -> channel ( HIDDEN )
  ;
  
  M_COMMENT_NEWLINE
  :
     F_NewlineChar+ -> type ( NEWLINE ) , popMode
  ;
  
  mode M_DoubleQuote;
  
  M_DoubleQuote_VARIABLE
  :
     ~'"'+ -> type ( VARIABLE )
  ;
  
  M_DoubleQuote_DOUBLE_QUOTE
  :
     '"' -> channel ( HIDDEN ) , popMode
  ;
  
  mode M_SingleQuote;
  
  M_SingleQuote_VARIABLE
  :
     ~'\''+ -> type ( VARIABLE )
  ;
  
  M_SingleQuote_SINGLE_QUOTE
  :
     '\'' -> channel ( HIDDEN ) , popMode
  ;
  