---input---
module toplevel(clock,reset);
 input clock;
 input reset;
 
 reg flop1;
 reg flop2;
 
 always @ (posedge reset or posedge clock)
 if (reset)
   begin
     flop1 <= 0;
     flop2 <= 1;
   end
 else
   begin
     flop1 <= flop2;
     flop2 <= flop1;
   end
endmodule

---tokens---
'module'      Keyword
' '           Text
'toplevel'    Name
'('           Punctuation
'clock'       Name
','           Punctuation
'reset'       Name
')'           Punctuation
';'           Punctuation
'\n'          Text

' '           Text
'input'       Keyword
' '           Text
'clock'       Name
';'           Punctuation
'\n'          Text

' '           Text
'input'       Keyword
' '           Text
'reset'       Name
';'           Punctuation
'\n'          Text

' \n '        Text
'reg'         Keyword.Type
' '           Text
'flop1'       Name
';'           Punctuation
'\n'          Text

' '           Text
'reg'         Keyword.Type
' '           Text
'flop2'       Name
';'           Punctuation
'\n'          Text

' \n '        Text
'always'      Keyword
' '           Text
'@'           Punctuation
' '           Text
'('           Punctuation
'posedge'     Keyword
' '           Text
'reset'       Name
' '           Text
'or'          Keyword
' '           Text
'posedge'     Keyword
' '           Text
'clock'       Name
')'           Punctuation
'\n'          Text

' '           Text
'if'          Keyword
' '           Text
'('           Punctuation
'reset'       Name
')'           Punctuation
'\n'          Text

'   '         Text
'begin'       Keyword
'\n'          Text

'     '       Text
'flop1'       Name
' '           Text
'<'           Operator
'='           Operator
' '           Text
'0'           Literal.Number.Integer
';'           Punctuation
'\n'          Text

'     '       Text
'flop2'       Name
' '           Text
'<'           Operator
'='           Operator
' '           Text
'1'           Literal.Number.Integer
';'           Punctuation
'\n'          Text

'   '         Text
'end'         Keyword
'\n'          Text

' '           Text
'else'        Keyword
'\n'          Text

'   '         Text
'begin'       Keyword
'\n'          Text

'     '       Text
'flop1'       Name
' '           Text
'<'           Operator
'='           Operator
' '           Text
'flop2'       Name
';'           Punctuation
'\n'          Text

'     '       Text
'flop2'       Name
' '           Text
'<'           Operator
'='           Operator
' '           Text
'flop1'       Name
';'           Punctuation
'\n'          Text

'   '         Text
'end'         Keyword
'\n'          Text

'endmodule'   Keyword
'\n'          Text