PlantUML Language specification Extended Backus-Naur Form

       

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语法图

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Minimal binary diagram

@startebnf binaryDigit = "0" | "1"; @endebnf

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All EBNF Elements

@startebnf title All EBNF elements managed by PlantUML (* Nodes *) litteral = "a"; special = ? a ?; rule = a; (* Edges *) required = a; optional = [a]; zero_or_more = {a}; one_or_more = a, {a}; one_or_more_ebnf = {a}-; zero_or_more_with_separator = [a, {',', a}]; one_or_more_with_separator = a, {',', a}; zero_or_more_with_terminator = {a, ','}; one_or_more_with_terminator = a, ',', {a, ','}; one_or_more_with_terminator_ebnf = {a, ','}-; alternative = a | b; group = (a | b) , c; without_group = a | b , c; @endebnf

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Special sequence management with special-sequence-symbol "?"

@startebnf (* Example from §8.1 ISO-EBNF *) h-tab = ? IS0 6429 character Horizontal Tabulation ? ; new-line = { ? IS0 6429 character Carriage Return ? }, ? IS0 6429 character Line Feed ?, { ? IS0 6429 character Carriage Return ? }; (* Other possible examples: *) h-tab = ?Unicode U+0009?; empty-special = ??; @endebnf

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Full repetition management with repetition-symbol "*"

@startebnf (* Simplified Fortran example *) Fortran_77_continuation_line = 5 * " ", '[...]', 66 * [character]; (* Minimal test *) test = 4 * '2'; (* Example of §5.7 Syntactic-factor of ISO EBNF *) aa = "A"; bb = 3 * aa, "B"; cc = 3 * [aa], "C"; dd = {aa}, "D"; ee = aa, {aa}, "E"; ff = 3 * aa, 3 * [aa], "F"; gg = 3 * {aa}, "D"; @endebnf

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Drawing mode

Expanded mode (by default, and the only one from V1.2025.1)

@startebnf title Expanded mode zero_or_more = {a}; one_or_more = a, {a}; one_or_more_ebnf = {a}-; zero_or_more_with_separator = [a, {',', a}]; one_or_more_with_separator = a, {',', a}; zero_or_more_with_terminator = {a, ','}; one_or_more_with_terminator = a, ',', {a, ','}; @endebnf

Compacted mode (only available before V1.2025.1)

@startebnf !pragma compact title Compacted mode zero_or_more = {a}; one_or_more = a, {a}; one_or_more_ebnf = {a}-; zero_or_more_with_separator = [a, {',', a}]; one_or_more_with_separator = a, {',', a}; zero_or_more_with_terminator = {a, ','}; one_or_more_with_terminator = a, ',', {a, ','}; @endebnf

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Notes on Elements

@startebnf title Comments (* Notes for Rule1 *) Rule1 = {"a-z" (* any letter *) }; (* Notes for Rule2 *) Rule2 =; (* Additional notes and references *) @endebnf

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Using (global) style

Without style (by default)

@startebnf title Title not_styled_ebnf = {"a", c , "a" (* Note on a *)} | ? special ? | "repetition", 4 * '2'; (* Global End Note *) @endebnf

With style

@startebnf <style> element { ebnf { LineColor blue Fontcolor green Backgroundcolor palegreen note { Backgroundcolor pink } } } </style> title Title styled_ebnf = {"a", c , "a" (* Note on a *)} | ? special ? | "repetition", 4 * '2'; (* Global End Note *) @endebnf

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Example of LISP Grammar

@startebnf title LISP Grammar grammars_expression = atomic_symbol | "(", s_expression, ".", s_expression, ")" | list; list = "(", s_expression, { s_expression }, ")"; atomic_symbol = letter, atom_part; atom_part = empty | letter, atom_part | number, atom_part; letter = ? a-z ?; number = ? 1-9 ?; empty = " "; @endebnf

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EBNF of PlantUMLs EBNF Grammar

@startebnf grammar = { rule }; rule = lhs , "=" (* definition *) , rhs , ";" (* termination *); lhs = identifier ; rhs = identifier | terminal | "[" , rhs (* optional *) , "]" | "{" , rhs (* repetition *), "}" | "(" , rhs (* grouping *) , ")" | "(*" , string (* comment *) , "*)" | "?" , rhs (* special sequence, aka notation *) , "?" | rhs , "|" (* alternation *) , rhs | rhs , "," (* concatenation *), rhs ; identifier = letter , { letter | digit | "_" } ; terminal = "'" , character , { character } , "'" | '"' , character , { character } , '"' ; character = letter | digit | symbol | "_" ; symbol = "[" | "]" | "{" | "}" | "(" | ")" | "<" | ">" | "'" | '"' | "=" | "|" | "." | "," | ";" ; digit = ? 0-9 ? ; letter = ? A-Z or a-z ? ; @endebnf

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Java Language Specification

Packages and Modules

@startebnf CompilationUnit = OrdinaryCompilationUnit | ModularCompilationUnit; OrdinaryCompilationUnit = [PackageDeclaration], {ImportDeclaration}, {TopLevelClassOrInterfaceDeclaration}; ModularCompilationUnit = {ImportDeclaration}, ModuleDeclaration; PackageDeclaration = {PackageModifier}, "package", Identifier, {Identifier}, ";"; PackageModifier = Annotation; ImportDeclaration = SingleTypeImportDeclaration | TypeImportOnDemandDeclaration | SingleStaticImportDeclaration | StaticImportOnDemandDeclaration; SingleTypeImportDeclaration = "import", TypeName, ";"; TypeImportOnDemandDeclaration = "import", PackageOrTypeName, ".*", ";"; SingleStaticImportDeclaration = "import", "static", TypeName, ".", Identifier, ";"; StaticImportOnDemandDeclaration = "import", "static", TypeName, ".*", ";"; TopLevelClassOrInterfaceDeclaration = (ClassDeclaration | InterfaceDeclaration), ";"; ModuleDeclaration = {Annotation}, [open], "module", Identifier, {Identifier}, "{", {ModuleDirective}, "}"; ModuleDirective = ("requires", {RequiresModifier}, ModuleName, ";") | ("exports", PackageName, ["to", ModuleName, {",", ModuleName}], ";") | ("opens", PackageName, ["to", ModuleName, {",", ModuleName}], ";") | ("uses", TypeName, ";") | ("provides", TypeName, "with", TypeName, {",", TypeName}, ";"); RequiresModifier = "transitive" | "static"; @endebnf

Lexical Structure

@startebnf Identifier = ?IdentifierChars but not a ReservedKeyword or BooleanLiteral or NullLiteral?; IdentifierChars = JavaLetter, {JavaLetterOrDigit}; JavaLetter = ? any Unicode character that is a "Java letter" ?; JavaLetterOrDigit = ? any Unicode character that is a "Java letter-or-digit" ?; TypeIdentifier = ? Identifier but not permits, record, sealed, var, or yield ?; UnqualifiedMethodIdentifier = ? Identifier but not yield ?; Literal = IntegerLiteral | FloatingPointLiteral | BooleanLiteral | CharacterLiteral | StringLiteral | TextBlock | NullLiteral; @endebnf

Types, Values, and Variables

@startebnf Type = PrimitiveType | ReferenceType; PrimitiveType = [Annotation], (NumericType | boolean ); NumericType = IntegralType | FloatingPointType; IntegralType = "byte" | "short" | "int" | "long" | "char"; FloatingPointType = "float" | "double"; ReferenceType = ClassOrInterfaceType | TypeVariable | ArrayType; ClassOrInterfaceType = ClassType | InterfaceType; ClassType = {Annotation}, TypeIdentifier, [TypeArguments]; PackageName = {Annotation}, TypeIdentifier, [TypeArguments]; ClassOrInterfaceType = {Annotation}, TypeIdentifier, [TypeArguments]; InterfaceType = ClassType; TypeVariable = {Annotation}, TypeIdentifier; ArrayType = (PrimitiveType | ClassOrInterfaceType | TypeVariable), Dims; Dims= {Annotation}, "[", "]", {{Annotation}, "[", "]"}; TypeParameter = {TypeParameterModifier}, TypeIdentifier, [TypeBound]; TypeParameterModifier = Annotation; TypeBound = ("extends", TypeVariable) | ("extends", ClassOrInterfaceType, {AdditionalBound}); AdditionalBound = "&", InterfaceType; TypeArguments = "<", TypeArgumentList, ">"; TypeArgumentList = TypeArgument, {",", TypeArgument}; TypeArgument = ReferenceType | Wildcard; Wildcard = {Annotation}, "?", [WildcardBounds]; WildcardBounds = ("extends" | "super"), ReferenceType; @endebnf

Names

@startebnf ModuleName = Identifier | ( ModuleName, ".", Identifier); PackageName = Identifier | (PackageName, ".", Identifier); TypeName = TypeIdentifier | (PackageOrTypeName, ".", TypeIdentifier); ExpressionName = Identifier | ( AmbiguousName, ".", Identifier); MethodName = UnqualifiedMethodIdentifier; PackageOrTypeName = Identifier | (PackageOrTypeName, ".", Identifier); AmbiguousName = Identifier | (AmbiguousName, ".", Identifier); @endebnf

Classes

@startebnf ClassDeclaration = NormalClassDeclaration | EnumDeclaration | RecordDeclaration; NormalClassDeclaration = {ClassModifier}, "class", TypeIdentifier, [TypeParameters], [ClassExtends], [ClassImplements], [ClassPermits], ClassBody; ClassModifier = Annotation | "public" | "protected" | "private" | "abstract" | "static" | "final" | "sealed" | "non-sealed" | "strictfp"; TypeParameters = "<", TypeParameterList, ">"; TypeParameterList = TypeParameter, {",", TypeParameter}; ClassExtends = "extends", ClassType; ClassImplements = "implements", InterfaceTypeList; InterfaceTypeList = InterfaceType, {",", InterfaceType}; ClassPermits = "permits", TypeName, {",", TypeName}; ClassBody = "{", {ClassBodyDeclaration}, "}"; ClassBodyDeclaration = ClassMemberDeclaration | InstanceInitializer | StaticInitializer | ConstructorDeclaration; ClassMemberDeclaration = (FieldDeclaration | MethodDeclaration | ClassDeclaration | InterfaceDeclaration), ";"; FieldDeclaration = {FieldModifier}, UnannType, VariableDeclaratorList, ";"; FieldModifier = Annotation | "public" | "protected" | "private" | "static" | "final" | "transient" | "volatile"; VariableDeclaratorList = VariableDeclarator, {",", VariableDeclarator}; VariableDeclarator = VariableDeclaratorId, ["=", VariableInitializer]; VariableDeclaratorId = Identifier, [Dims]; VariableInitializer = Expression | ArrayInitializer; UnannType = UnannPrimitiveType | UnannReferenceType; UnannPrimitiveType = NumericType | boolean; UnannReferenceType = UnannClassOrInterfaceType | UnannTypeVariable | UnannArrayType; UnannClassOrInterfaceType = UnannClassType | UnannInterfaceType; UnannClassType = (TypeIdentifier, [TypeArguments]) | (PackageName, ".", {Annotation}, TypeIdentifier, [TypeArguments]) | (UnannClassOrInterfaceType, ".", {Annotation}, TypeIdentifier, [TypeArguments]) | (TypeIdentifier, [TypeArguments]) | (TypeIdentifier, [TypeArguments]); UnannInterfaceType = UnannClassType; UnannTypeVariable = TypeIdentifier; UnannArrayType = (UnannPrimitiveType, Dims) | (UnannClassOrInterfaceType, Dims) | (UnannTypeVariable, Dims); MethodDeclaration = {MethodModifier}, MethodHeader, MethodBody; MethodModifier = Annotation | "public" | "protected" | "private" | "abstract" | "static" | "final" | "synchronized" | "native" | "strictfp"; MethodHeader = (Result, MethodDeclarator, [Throws]) | (TypeParameters, {Annotation}, Result, MethodDeclarator, [Throws]); Result = UnannType | "void"; MethodDeclarator = Identifier, ( [ ReceiverParameter, "," ], [FormalParameterList] ), [Dims]; ReceiverParameter = {Annotation}, UnannType, [Identifier, "."], "this"; FormalParameterList = FormalParameter, {",", FormalParameter}; FormalParameter = ({VariableModifier}, UnannType, VariableDeclaratorId) | VariableArityParameter; VariableArityParameter = {VariableModifier}, UnannType, {Annotation}, "...", Identifier; VariableModifier = Annotation | "final"; Throws = "throws", ExceptionTypeList; ExceptionTypeList = ExceptionType, {",", ExceptionType}; ExceptionType = ClassType | TypeVariable; MethodBody = Block | ";"; InstanceInitializer = Block; StaticInitializer = "static", Block; ConstructorDeclaration = {ConstructorModifier}, ConstructorDeclarator, [Throws], ConstructorBody; ConstructorModifier = Annotation | "public" | "protected" | "private"; ConstructorDeclarator = [TypeParameters], SimpleTypeName, ( [ReceiverParameter, ","], [FormalParameterList] ); SimpleTypeName = TypeIdentifier; ConstructorBody = { [ExplicitConstructorInvocation], [BlockStatements] }; ExplicitConstructorInvocation = ( [TypeArguments], "this", "(", [ArgumentList], ")", ";" ) | ([TypeArguments], "super", "(", [ArgumentList], ")", ";" ) | (ExpressionName, ".", [TypeArguments], "super", "(", [ArgumentList], ")", ";" ) | (Primary, "." [TypeArguments], "super", "(" [ArgumentList], ")", ";"; EnumDeclaration = {ClassModifier}, "enum", TypeIdentifier, [ClassImplements], EnumBody; EnumBody = "{", [EnumConstantList], [","], [EnumBodyDeclarations], "}"; EnumConstantList = EnumConstant, {",", EnumConstant}; EnumConstant = {EnumConstantModifier}, Identifier, ["(", [ArgumentList], ")"], [ClassBody]; EnumConstantModifier = Annotation; EnumBodyDeclarations = ";", {ClassBodyDeclaration}; RecordDeclaration = {ClassModifier}, "record", TypeIdentifier, [TypeParameters], RecordHeader, [ClassImplements], RecordBody; RecordHeader = "(", [RecordComponentList], ")"; RecordComponentList = RecordComponent, {",", RecordComponent}; RecordComponent = (RecordComponentModifier}, UnannType, Identifier) | VariableArityRecordComponent; VariableArityRecordComponent = {RecordComponentModifier}, UnannType, {Annotation}, "...", Identifier; RecordComponentModifier = Annotation; RecordBody = "{", {RecordBodyDeclaration}, "}"; RecordBodyDeclaration = ClassBodyDeclaration | CompactConstructorDeclaration; CompactConstructorDeclaration = {ConstructorModifier}, SimpleTypeName, ConstructorBody; @endebnf

Interfaces

@startebnf InterfaceDeclaration = NormalInterfaceDeclaration | AnnotationInterfaceDeclaration; NormalInterfaceDeclaration = {InterfaceModifier}, "interface", TypeIdentifier, [TypeParameters], [InterfaceExtends], [InterfacePermits], InterfaceBody; InterfaceModifier = Annotation | "public" | "protected" | "private" | "abstract" | "static" | "sealed" | "non-sealed" | "strictfp"; InterfaceExtends = "extends", InterfaceTypeList; InterfacePermits = "permits", TypeName, {",", TypeName}; InterfaceBody = "{", {InterfaceMemberDeclaration}, "}"; InterfaceMemberDeclaration = ConstantDeclaration | InterfaceMethodDeclaration | ClassDeclaration | InterfaceDeclaration | ";"; ConstantDeclaration = {ConstantModifier}, UnannType, VariableDeclaratorList, ";"; ConstantModifier = Annotation | "public" | "static" | "final"; InterfaceMethodDeclaration = {InterfaceMethodModifier}, MethodHeader, MethodBody; InterfaceMethodModifier = Annotation | "public" | "private" | "abstract" | "default" | "static" | "strictfp"; AnnotationInterfaceDeclaration = {InterfaceModifier}, "@", "interface", TypeIdentifier, AnnotationInterfaceBody; AnnotationInterfaceBody = "{", {AnnotationInterfaceMemberDeclaration}, "}"; AnnotationInterfaceMemberDeclaration = AnnotationInterfaceElementDeclaration | ConstantDeclaration | ClassDeclaration | InterfaceDeclaration, ";"; AnnotationInterfaceElementDeclaration = {AnnotationInterfaceElementModifier}, UnannType, Identifier, "(", ")", [Dims], [DefaultValue], ";"; AnnotationInterfaceElementModifier = Annotation | "public" | "abstract"; DefaultValue = "default", ElementValue; Annotation = NormalAnnotation | MarkerAnnotation | SingleElementAnnotation; NormalAnnotation = "@", TypeName, "(", [ElementValuePairList], ")"; ElementValuePairList = ElementValuePair, {",", ElementValuePair}; ElementValuePair = Identifier, "=", ElementValue; ElementValue = ConditionalExpression | ElementValueArrayInitializer | Annotation; ElementValueArrayInitializer = "{", [ElementValueList], [","], "}"; ElementValueList = ElementValue, {",", ElementValue}; MarkerAnnotation = "@", TypeName; SingleElementAnnotation = "@", TypeName, "(", ElementValue, ")"; @endebnf

Arrays

@startebnf ArrayInitializer = "{", [VariableInitializerList], [","], "}"; VariableInitializerList = VariableInitializer, {",", VariableInitializer}; @endebnf

Blocks, Statements, and Patterns

@startebnf Block = "{", [BlockStatements], "}"; BlockStatements = BlockStatement, {BlockStatement}; BlockStatement = LocalClassOrInterfaceDeclaration | LocalVariableDeclarationStatement | Statement; LocalClassOrInterfaceDeclaration = ClassDeclaration | NormalInterfaceDeclaration; LocalVariableDeclarationStatement = LocalVariableDeclaration, ";"; LocalVariableDeclaration = {VariableModifier}, LocalVariableType, VariableDeclaratorList; LocalVariableType = UnannType | "var"; Statement = StatementWithoutTrailingSubstatement | LabeledStatement | IfThenStatement | IfThenElseStatement | WhileStatement | ForStatement; StatementNoShortIf = StatementWithoutTrailingSubstatement | LabeledStatementNoShortIf | IfThenElseStatementNoShortIf | WhileStatementNoShortIf | ForStatementNoShortIf; StatementWithoutTrailingSubstatement = Block | EmptyStatement | ExpressionStatement | AssertStatement | SwitchStatement | DoStatement | BreakStatement | ContinueStatement | ReturnStatement | SynchronizedStatement | ThrowStatement | TryStatement | YieldStatement; EmptyStatement = ";"; LabeledStatement = Identifier, ":", Statement; LabeledStatementNoShortIf = Identifier, ":", StatementNoShortIf; ExpressionStatement = StatementExpression, ";"; StatementExpression = Assignment | PreIncrementExpression | PreDecrementExpression | PostIncrementExpression | PostDecrementExpression | MethodInvocation | ClassInstanceCreationExpression; IfThenStatement = "if", "(", Expression, ")", Statement; IfThenElseStatement = "if", "(", Expression, ")", StatementNoShortIf, "else", Statement; IfThenElseStatementNoShortIf = "if", "(", Expression, ")", StatementNoShortIf, "else", StatementNoShortIf; AssertStatement = ("assert", Expression, ";") | ("assert", Expression, ":", Expression, ";"); SwitchStatement = "switch", "(", Expression, ")", SwitchBlock; SwitchBlock = ( "{", SwitchRule, {SwitchRule}, "}" ) | ( "{", {SwitchBlockStatementGroup}, {SwitchLabel, ":"}, "}" ); SwitchRule = (SwitchLabel, "->", Expression, ";") |(SwitchLabel, "->", Block) | (SwitchLabel, "->", ThrowStatement); SwitchBlockStatementGroup = SwitchLabel, ":", {SwitchLabel, ":"}, BlockStatements; SwitchLabel = ("case", CaseConstant, {",", CaseConstant}) | "default"; CaseConstant = ConditionalExpression; WhileStatement = "while", "(", Expression, ")", Statement; WhileStatementNoShortIf = "while", "(", Expression, ")", StatementNoShortIf; DoStatement = "do", Statement, "while", "(", Expression, ")", ";"; ForStatement = BasicForStatement | EnhancedForStatement | ForStatementNoShortIf | BasicForStatementNoShortIf | EnhancedForStatementNoShortIf; BasicForStatement = "for", "(", [ForInit], ";", [Expression], ";", [ForUpdate], ")", Statement; BasicForStatementNoShortIf = "for", "(", [ForInit], ";", [Expression], ";", [ForUpdate], ")", StatementNoShortIf; ForInit = StatementExpressionList | LocalVariableDeclaration; ForUpdate = StatementExpressionList; StatementExpressionList = StatementExpression, {",", StatementExpression}; EnhancedForStatement = "for", "(", LocalVariableDeclaration, ":", Expression, ")", Statement; EnhancedForStatementNoShortIf = "for", "(", LocalVariableDeclaration, ":", Expression, ")", StatementNoShortIf; BreakStatement = break, [Identifier], ";"; YieldStatement = "yield", Expression, ";"; ContinueStatement = "continue", [Identifier], ";"; ReturnStatement = "return" [Expression], ";"; ThrowStatement = "throw", Expression, ";"; SynchronizedStatement = "synchronized", "(", Expression, ")", Block; TryStatement = ("try", Block, Catches) | ("try", Block, [Catches], Finally ) | TryWithResourcesStatement; Catches = CatchClause, {CatchClause}; CatchClause = "catch", "(", CatchFormalParameter, ")", Block; CatchFormalParameter = {VariableModifier}, CatchType, VariableDeclaratorId; CatchType = UnannClassType, {"|", ClassType}; Finally = "finally", Block; TryWithResourcesStatement = "try", ResourceSpecification, Block, [Catches], [Finally]; ResourceSpecification = "(", ResourceList, [";"], ")"; ResourceList = Resource, {";", Resource}; Resource = LocalVariableDeclaration | VariableAccess; Pattern = TypePattern; TypePattern = LocalVariableDeclaration; (* Expressions *) Primary = PrimaryNoNewArray | ArrayCreationExpression; PrimaryNoNewArray = Literal | ClassLiteral | "this" | (TypeName, ".", "this") | ( "(", Expression, ")" ) | ClassInstanceCreationExpression | FieldAccess | ArrayAccess | MethodInvocation | MethodReference; ClassLiteral = (TypeName, { "[", "]" }, ".", "class") | (NumericType, {"[", "]"}, ".", "class") | ("boolean", {"[", "]"}, ".", "class") | ("void", ".", "class"); ClassInstanceCreationExpression = UnqualifiedClassInstanceCreationExpression | (ExpressionName, ".", UnqualifiedClassInstanceCreationExpression) |(Primary, ".", UnqualifiedClassInstanceCreationExpression); UnqualifiedClassInstanceCreationExpression = "new", [TypeArguments], ClassOrInterfaceTypeToInstantiate, "(", [ArgumentList], ")", [ClassBody]; ClassOrInterfaceTypeToInstantiate = {Annotation}, Identifier, {".", {Annotation}, Identifier}, [TypeArgumentsOrDiamond]; TypeArgumentsOrDiamond = TypeArguments | ("<",">"); ArrayCreationExpression = ArrayCreationExpressionWithoutInitializer | ArrayCreationExpressionWithInitializer; ArrayCreationExpressionWithoutInitializer = ("new", PrimitiveType, DimExprs, [Dims]) | ("new", ClassOrInterfaceType, DimExprs, [Dims]); ArrayCreationExpressionWithInitializer = ("new", PrimitiveType, Dims, ArrayInitializer) | ("new", ClassOrInterfaceType, Dims, ArrayInitializer); DimExprs = DimExpr, {DimExpr}; DimExpr = ({Annotation}, [ Expression ]) | (ArrayAccess, "=", ExpressionName, "[", Expression, "]") | (PrimaryNoNewArray, "[", Expression, "]") | (ArrayCreationExpressionWithInitializer, "[", Expression, "]"); FieldAccess = (Primary, ".", Identifier), ("super", ".", Identifier), (TypeName, ".", super, ".", Identifier); MethodInvocation = (MethodName, "(", [ArgumentList], ")") | (TypeName, ".", [TypeArguments], Identifier, "(", [ArgumentList], ")") | (ExpressionName, ".", [TypeArguments], Identifier, "(", [ArgumentList], ")") | (Primary, ".", [TypeArguments], Identifier, "(", [ArgumentList], ")") | ("super", ".", [TypeArguments], Identifier, "(", [ArgumentList], ")") | (TypeName, ".", "super", ".", [TypeArguments], Identifier, "(", [ArgumentList], ")"); ArgumentList = Expression, {",", Expression}; MethodReference = (ExpressionName, "::", [TypeArguments], Identifier) | (Primary, "::", [TypeArguments], Identifier) | (ReferenceType, "::", [TypeArguments], Identifier) | ("super", "::", [TypeArguments], Identifier) | (TypeName, ".", super, "::", [TypeArguments], Identifier) | (ClassType, "::", [TypeArguments], "new") | (ArrayType, "::", "new"); Expression = LambdaExpression | AssignmentExpression; LambdaExpression = LambdaParameters, "->", LambdaBody; LambdaParameters = ("(", [LambdaParameterList], ")") | Identifier; LambdaParameterList = (LambdaParameter, {",", LambdaParameter}) | (Identifier, {",", Identifier}); LambdaParameter = ({VariableModifier}, LambdaParameterType, VariableDeclaratorId) | VariableArityParameter; LambdaParameterType = UnannType | "var"; LambdaBody = Expression | Block; AssignmentExpression = ConditionalExpression | Assignment; Assignment = LeftHandSide | AssignmentOperator | Expression; LeftHandSide = ExpressionName | FieldAccess | ArrayAccess; AssignmentOperator = "=" | "*=" | "/=" | "%=" | "+=" | "-=" | "<<=" | ">>=" | ">>>=" | "&=" | "^=" | "|="; ConditionalExpression = ConditionalOrExpression | (ConditionalOrExpression, "?", Expression, ":", ConditionalExpression) | (ConditionalOrExpression, "?", Expression, ":", LambdaExpression); ConditionalOrExpression = ConditionalAndExpression | (ConditionalOrExpression, "||", ConditionalAndExpression); ConditionalAndExpression = InclusiveOrExpression | (ConditionalAndExpression, "&&", InclusiveOrExpression); InclusiveOrExpression = ExclusiveOrExpression | (InclusiveOrExpression, "|", ExclusiveOrExpression); ExclusiveOrExpression = AndExpression | (ExclusiveOrExpression, "^", AndExpression); AndExpression = EqualityExpression, (AndExpression, "&", EqualityExpression) | (EqualityExpression, "=", RelationalExpression) | (EqualityExpression, "==", RelationalExpression) | (EqualityExpression, "!=", RelationalExpression); RelationalExpression = ShiftExpression | (RelationalExpression, "<", ShiftExpression) | (RelationalExpression, ">", ShiftExpression) | (RelationalExpression, "<=", ShiftExpression) | (RelationalExpression, ">=", ShiftExpression) | (InstanceofExpression); InstanceofExpression = (RelationalExpression, "instanceof", ReferenceType) | (RelationalExpression, "instanceof", Pattern); ShiftExpression = AdditiveExpression | (ShiftExpression, "<<", AdditiveExpression) | (ShiftExpression, ">>", AdditiveExpression) | (ShiftExpression, ">>>", AdditiveExpression); AdditiveExpression = MultiplicativeExpression | (AdditiveExpression, "+", MultiplicativeExpression) | (AdditiveExpression, "-", MultiplicativeExpression); MultiplicativeExpression = UnaryExpression | (MultiplicativeExpression, "*", UnaryExpression) | (MultiplicativeExpression, "/", UnaryExpression) | (MultiplicativeExpression, "%", UnaryExpression); UnaryExpression = PreIncrementExpression | PreDecrementExpression | ("+", UnaryExpression) | ("-", UnaryExpression) | UnaryExpressionNotPlusMinus; PreIncrementExpression = "++", UnaryExpression; PreDecrementExpression = "--", UnaryExpression; UnaryExpressionNotPlusMinus = PostfixExpression | ("~", UnaryExpression) | ("!", UnaryExpression) | CastExpression | SwitchExpression; PostfixExpression = Primary | ExpressionName | PostIncrementExpression | PostDecrementExpression; PostIncrementExpression = PostfixExpression, "++"; PostDecrementExpression = PostfixExpression, "--"; CastExpression = ("(", PrimitiveType, ")", UnaryExpression) | ("(", ReferenceType, {AdditionalBound}, ")", UnaryExpressionNotPlusMinus) | ("(", ReferenceType, {AdditionalBound}, ")", LambdaExpression); SwitchExpression = "switch", "(", Expression, ")", SwitchBlock; ConstantExpression = Expression; @endebnf

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Remaining defects

Could you put 'arrow head' on all rerouted lines?

@startebnf title Could you put 'arrow head' on all rerouted lines? test = [1], [12], [123], [1234]; @endebnf

Order issue

@startebnf a = (one, two), three; b = (one (* 1 *), two (* 2 *)), three (* 3 *); @endebnf

Allow accentuated or Unicode char on EBNF meta-identifier or rule name.

@startebnf (* Test of accentuated or Unicode char*) alt = été | hiver; hiver = 'froid'; été = 'chaud'; @endebnf

Allow full restriction management with except-symbol "-"

@startebnf title First [modified] example of §5.8 Syntactic-term of ISO-EBNF letter = ? "A" - "Z" ?; vowel = "A" | "E" | "I" | "O" | "U"; consonant = letter - vowel; @endebnf