| Mini Java编译器（二）__教程 |
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| 日期：2007-5-20 1:28:18 人气：115 [大 中 小] |
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二、Mini Java的文法
BNF
Goal
::=
MainClass ( TypeDeclaration )*
MainClass
::=
"class" Identifier "{" "public" "static" "void" "main" "(" "String" "[" "]" Identifier ")" "{" PrintStatement "}" "}"
TypeDeclaration
::=
ClassDeclaration
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ClassExtendsDeclaration
ClassDeclaration
::=
"class" Identifier "{" ( VarDeclaration )* ( MethodDeclaration )* "}"
ClassExtendsDeclaration
::=
"class" Identifier "extends" Identifier "{" ( VarDeclaration )* ( MethodDeclaration )* "}"
VarDeclaration
::=
Type Identifier ";"
MethodDeclaration
::=
"public" Type Identifier "(" ( FormalParameterList )? ")" "{" ( VarDeclaration )* ( Statement )* "return" Expression ";" "}"
FormalParameterList
::=
FormalParameter ( FormalParameterRest )*
FormalParameter
::=
Type Identifier
FormalParameterRest
::=
"," FormalParameter
Type
::=
ArrayType
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BooleanType
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IntegerType
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Identifier
ArrayType
::=
"int" "[" "]"
BooleanType
::=
"boolean"
IntegerType
::=
"int"
Statement
::=
Block
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AssignmentStatement
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ArrayAssignmentStatement
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IfStatement
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WhileStatement
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PrintStatement
Block
::=
"{" ( Statement )* "}"
AssignmentStatement
::=
Identifier "=" Expression ";"
ArrayAssignmentStatement
::=
Identifier "[" Expression "]" "=" Expression ";"
IfStatement |
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| 出处：本站原创 作者：佚名 |
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