2.grm

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//这是一个小型pascal文法

[nonterminal]
	subprogram_declarations subprogram_declaration
	subprogram_head arguments parameter_list
	optional_statements statement_list statement
[terminal]
	begin end function procedure
[production]
	subprogram_declarations => subprogram_declarations
							   subprogram_declaration semi | ;
	subprogram_declaration => subprogram_head
							  declarations
							  compound_statement ;
	subprogram_head => function id arguments : standard_type semi |
					   procedure id arguments semi ;
	arguments => ( parameter_list ) | ;
	parameter_list => identifier_list : type |
					  parameter_list semi identifier_list : type ;
	compound_statement => begin optional_statements end ;
	optional_statements => statement_list | ;
	statement_list => statement | statement_list semi statement ;