?? cmm語言的bnf表示.txt
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<DIGIT> ::= 0|1|2|3|4|6|6|7|8|9<LETTER> ::= a|b|c…|X|Y|Z<AddOp> ::= +|-<MulOp> ::= *|/<AssignOp> ::= =<RelationOp> ::= ==|!=|<|<=|>|>=<Underline> ::= _<Type> ::= int|real<Identifier> ::= {<LETTER>(<DIGIT>|<LETTER>|<UNDERLINE>}<IntNumber> ::= <DIGIT>{<DIGIT>}<RealNumber> ::= {<DIGIT>}<DOT><DIGIT>{<DIGIT>}|<DIGIT>{<DIGIT>}<DOT>{<DIGIT>}<Factor> ::= Identifier() | Number() | <MINUS>Factor() | <LPAREN>Expression()<RPAREN> <Item> ::= <Factor>{<MultOp> <Factor>}<Expression> ::= <Item>{<AddOp><Item>}<VarDeclaration> ::= <Type> <VarDeclarationId> [ <AssignOp> <VarInitializer>]<VarDeclarationId> ::= <Identifier> {‘[‘’]’}<VarInitializer> ::= <ArrayInitializer>|<Expression><ArrayInitializer> ::= ‘{‘[<VarInitializer> {‘,’<VarInitializer>}]’}’<AssignStatement> ::= <Identifier>{‘[‘<Expression>’]’} <AssignOp> <Expression><Condition> ::= <Expression> <RelationOp> <Expression><ConditionStatement> ::= ‘if’’(‘ <Condition>’)’<Statement> { ‘else’’if’’(‘<Condition>’)’ <Statement>} [‘else’<Statement>]<WhileStatement> ::= ‘while’’(‘<Condition>’)’<Statement><ReadStatement> ::= ‘read’’(‘<Identifier>{‘,’<Identifier>}’)’<WriteStatement> ::= ‘write’’(‘<Expression>{‘,’<Expression>}’)’<CompoundStatement> ::= ‘{‘<Statement>{<Statement>}’}’<Statement> ::= <AssignStatement> | <ConditionStatement> | <WhileStatement> | <ReadStatement> | <WriteStatement> | <CompoundStatement><Program> ::= {ConstDeclaration}{VarDeclaration}{Statement}?? 快捷鍵說明
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