haskell grammar for cup file

i am working on a haskell compiler written in java using JLex and cup .i finished my lexer file and now i am working on my parser.cup file where i should define my terminals , non-terminals and the grammar. i have already finished the terminal and non-terminal part but now i am stuck in the grammar part so can anyone help or redirect me to any link where i can find a grammar for haskell in this form :

Variable ::= Nonterminal:name Terminal:name 
{:RESULT = /* code to execute when the rule is 
matched and the result to be printed out */ ;:} 
| blablabla ;

any help would be appreciated .

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