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CSharpParser.g4
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// Eclipse Public License - v 1.0, http://www.eclipse.org/legal/epl-v10.html
// Copyright (c) 2013, Christian Wulf ([email protected])
// Copyright (c) 2016-2017, Ivan Kochurkin ([email protected]), Positive Technologies.
// $antlr-format alignTrailingComments true, columnLimit 150, minEmptyLines 1, maxEmptyLinesToKeep 1, reflowComments false, useTab false
// $antlr-format allowShortRulesOnASingleLine false, allowShortBlocksOnASingleLine true, alignSemicolons hanging, alignColons hanging
parser grammar CSharpParser;
options {
tokenVocab = CSharpLexer;
superClass = CSharpParserBase;
}
// entry point
compilation_unit
: BYTE_ORDER_MARK? extern_alias_directives? using_directives? global_attribute_section* namespace_member_declarations? EOF
;
//B.2 Syntactic grammar
//B.2.1 Basic concepts
namespace_or_type_name
: (identifier type_argument_list? | qualified_alias_member) (
'.' identifier type_argument_list?
)*
;
//B.2.2 Types
type_
: base_type ('?' | rank_specifier | '*')*
;
base_type
: simple_type
| class_type // represents types: enum, class, interface, delegate, type_parameter
| VOID '*'
| tuple_type
;
tuple_type
: '(' tuple_element (',' tuple_element)+ ')'
;
tuple_element
: type_ identifier?
;
simple_type
: numeric_type
| BOOL
;
numeric_type
: integral_type
| floating_point_type
| DECIMAL
;
integral_type
: SBYTE
| BYTE
| SHORT
| USHORT
| INT
| UINT
| LONG
| ULONG
| CHAR
;
floating_point_type
: FLOAT
| DOUBLE
;
/** namespace_or_type_name, OBJECT, STRING */
class_type
: namespace_or_type_name
| OBJECT
| DYNAMIC
| STRING
;
type_argument_list
: '<' type_ (',' type_)* '>'
;
//B.2.4 Expressions
argument_list
: argument (',' argument)*
;
argument
: (identifier ':')? refout = (REF | OUT | IN)? (expression | (VAR | type_) expression)
;
expression
: assignment
| non_assignment_expression
| REF non_assignment_expression
;
non_assignment_expression
: lambda_expression
| query_expression
| conditional_expression
;
assignment
: unary_expression assignment_operator expression
| unary_expression '??=' throwable_expression
;
assignment_operator
: '='
| '+='
| '-='
| '*='
| '/='
| '%='
| '&='
| '|='
| '^='
| '<<='
| right_shift_assignment
;
conditional_expression
: null_coalescing_expression ('?' throwable_expression ':' throwable_expression)?
;
null_coalescing_expression
: conditional_or_expression ('??' (null_coalescing_expression | throw_expression))?
;
conditional_or_expression
: conditional_and_expression (OP_OR conditional_and_expression)*
;
conditional_and_expression
: inclusive_or_expression (OP_AND inclusive_or_expression)*
;
inclusive_or_expression
: exclusive_or_expression ('|' exclusive_or_expression)*
;
exclusive_or_expression
: and_expression ('^' and_expression)*
;
and_expression
: equality_expression ('&' equality_expression)*
;
equality_expression
: relational_expression ((OP_EQ | OP_NE) relational_expression)*
;
relational_expression
: shift_expression (('<' | '>' | '<=' | '>=') shift_expression | IS isType | AS type_)*
;
shift_expression
: additive_expression (('<<' | right_shift) additive_expression)*
;
additive_expression
: multiplicative_expression (('+' | '-') multiplicative_expression)*
;
multiplicative_expression
: switch_expression (('*' | '/' | '%') switch_expression)*
;
switch_expression
: range_expression ('switch' '{' (switch_expression_arms ','?)? '}')?
;
switch_expression_arms
: switch_expression_arm (',' switch_expression_arm)*
;
switch_expression_arm
: expression case_guard? right_arrow throwable_expression
;
range_expression
: unary_expression
| unary_expression? OP_RANGE unary_expression?
;
// https://msdn.microsoft.com/library/6a71f45d(v=vs.110).aspx
unary_expression
: cast_expression
| primary_expression
| '+' unary_expression
| '-' unary_expression
| BANG unary_expression
| '~' unary_expression
| '++' unary_expression
| '--' unary_expression
| AWAIT unary_expression // C# 5
| '&' unary_expression
| '*' unary_expression
| '^' unary_expression // C# 8 ranges
;
cast_expression
: OPEN_PARENS type_ CLOSE_PARENS unary_expression
;
primary_expression // Null-conditional operators C# 6: https://msdn.microsoft.com/en-us/library/dn986595.aspx
: pe = primary_expression_start '!'? bracket_expression* '!'? (
(member_access | method_invocation | '++' | '--' | '->' identifier) '!'? bracket_expression* '!'?
)*
;
primary_expression_start
: literal # literalExpression
| identifier type_argument_list? # simpleNameExpression
| OPEN_PARENS expression CLOSE_PARENS # parenthesisExpressions
| predefined_type # memberAccessExpression
| qualified_alias_member # memberAccessExpression
| LITERAL_ACCESS # literalAccessExpression
| THIS # thisReferenceExpression
| BASE ('.' identifier type_argument_list? | '[' expression_list ']') # baseAccessExpression
| NEW (
type_ (
object_creation_expression
| object_or_collection_initializer
| '[' expression_list ']' rank_specifier* array_initializer?
| rank_specifier+ array_initializer
)
| anonymous_object_initializer
| rank_specifier array_initializer
) # objectCreationExpression
| OPEN_PARENS argument ( ',' argument)+ CLOSE_PARENS # tupleExpression
| TYPEOF OPEN_PARENS (unbound_type_name | type_ | VOID) CLOSE_PARENS # typeofExpression
| CHECKED OPEN_PARENS expression CLOSE_PARENS # checkedExpression
| UNCHECKED OPEN_PARENS expression CLOSE_PARENS # uncheckedExpression
| DEFAULT (OPEN_PARENS type_ CLOSE_PARENS)? # defaultValueExpression
| ASYNC? DELEGATE (OPEN_PARENS explicit_anonymous_function_parameter_list? CLOSE_PARENS)? block # anonymousMethodExpression
| SIZEOF OPEN_PARENS type_ CLOSE_PARENS # sizeofExpression
// C# 6: https://msdn.microsoft.com/en-us/library/dn986596.aspx
| NAMEOF OPEN_PARENS (identifier '.')* identifier CLOSE_PARENS # nameofExpression
;
throwable_expression
: expression
| throw_expression
;
throw_expression
: THROW expression
;
member_access
: '?'? '.' identifier type_argument_list?
;
bracket_expression
: '?'? '[' indexer_argument (',' indexer_argument)* ']'
;
indexer_argument
: (identifier ':')? expression
;
predefined_type
: BOOL
| BYTE
| CHAR
| DECIMAL
| DOUBLE
| FLOAT
| INT
| LONG
| OBJECT
| SBYTE
| SHORT
| STRING
| UINT
| ULONG
| USHORT
;
expression_list
: expression (',' expression)*
;
object_or_collection_initializer
: object_initializer
| collection_initializer
;
object_initializer
: OPEN_BRACE (member_initializer_list ','?)? CLOSE_BRACE
;
member_initializer_list
: member_initializer (',' member_initializer)*
;
member_initializer
: (identifier | '[' expression ']') '=' initializer_value // C# 6
;
initializer_value
: expression
| object_or_collection_initializer
;
collection_initializer
: OPEN_BRACE element_initializer (',' element_initializer)* ','? CLOSE_BRACE
;
element_initializer
: non_assignment_expression
| OPEN_BRACE expression_list CLOSE_BRACE
;
anonymous_object_initializer
: OPEN_BRACE (member_declarator_list ','?)? CLOSE_BRACE
;
member_declarator_list
: member_declarator (',' member_declarator)*
;
member_declarator
: primary_expression
| identifier '=' expression
;
unbound_type_name
: identifier (generic_dimension_specifier? | '::' identifier generic_dimension_specifier?) (
'.' identifier generic_dimension_specifier?
)*
;
generic_dimension_specifier
: '<' ','* '>'
;
isType
: base_type (rank_specifier | '*')* '?'? isTypePatternArms? identifier?
;
isTypePatternArms
: '{' isTypePatternArm (',' isTypePatternArm)* '}'
;
isTypePatternArm
: identifier ':' expression
;
lambda_expression
: ASYNC? anonymous_function_signature right_arrow anonymous_function_body
;
anonymous_function_signature
: OPEN_PARENS CLOSE_PARENS
| OPEN_PARENS explicit_anonymous_function_parameter_list CLOSE_PARENS
| OPEN_PARENS implicit_anonymous_function_parameter_list CLOSE_PARENS
| identifier
;
explicit_anonymous_function_parameter_list
: explicit_anonymous_function_parameter (',' explicit_anonymous_function_parameter)*
;
explicit_anonymous_function_parameter
: refout = (REF | OUT | IN)? type_ identifier
;
implicit_anonymous_function_parameter_list
: identifier (',' identifier)*
;
anonymous_function_body
: throwable_expression
| block
;
query_expression
: from_clause query_body
;
from_clause
: FROM type_? identifier IN expression
;
query_body
: query_body_clause* select_or_group_clause query_continuation?
;
query_body_clause
: from_clause
| let_clause
| where_clause
| combined_join_clause
| orderby_clause
;
let_clause
: LET identifier '=' expression
;
where_clause
: WHERE expression
;
combined_join_clause
: JOIN type_? identifier IN expression ON expression EQUALS expression (INTO identifier)?
;
orderby_clause
: ORDERBY ordering (',' ordering)*
;
ordering
: expression dir = (ASCENDING | DESCENDING)?
;
select_or_group_clause
: SELECT expression
| GROUP expression BY expression
;
query_continuation
: INTO identifier query_body
;
//B.2.5 Statements
statement
: labeled_Statement
| declarationStatement
| embedded_statement
;
declarationStatement
: local_variable_declaration ';'
| local_constant_declaration ';'
| local_function_declaration
;
local_function_declaration
: local_function_header local_function_body
;
local_function_header
: local_function_modifiers? return_type identifier type_parameter_list? OPEN_PARENS formal_parameter_list? CLOSE_PARENS
type_parameter_constraints_clauses?
;
local_function_modifiers
: (ASYNC | UNSAFE) STATIC?
| STATIC (ASYNC | UNSAFE)
;
local_function_body
: block
| right_arrow throwable_expression ';'
;
labeled_Statement
: identifier ':' statement
;
embedded_statement
: block
| simple_embedded_statement
;
simple_embedded_statement
: ';' # theEmptyStatement
| expression ';' # expressionStatement
// selection statements
| IF OPEN_PARENS expression CLOSE_PARENS if_body (ELSE if_body)? # ifStatement
| SWITCH OPEN_PARENS expression CLOSE_PARENS OPEN_BRACE switch_section* CLOSE_BRACE # switchStatement
// iteration statements
| WHILE OPEN_PARENS expression CLOSE_PARENS embedded_statement # whileStatement
| DO embedded_statement WHILE OPEN_PARENS expression CLOSE_PARENS ';' # doStatement
| FOR OPEN_PARENS for_initializer? ';' expression? ';' for_iterator? CLOSE_PARENS embedded_statement # forStatement
| AWAIT? FOREACH OPEN_PARENS local_variable_type identifier IN expression CLOSE_PARENS embedded_statement # foreachStatement
// jump statements
| BREAK ';' # breakStatement
| CONTINUE ';' # continueStatement
| GOTO (identifier | CASE expression | DEFAULT) ';' # gotoStatement
| RETURN expression? ';' # returnStatement
| THROW expression? ';' # throwStatement
| TRY block (catch_clauses finally_clause? | finally_clause) # tryStatement
| CHECKED block # checkedStatement
| UNCHECKED block # uncheckedStatement
| LOCK OPEN_PARENS expression CLOSE_PARENS embedded_statement # lockStatement
| USING OPEN_PARENS resource_acquisition CLOSE_PARENS embedded_statement # usingStatement
| YIELD (RETURN expression | BREAK) ';' # yieldStatement
// unsafe statements
| UNSAFE block # unsafeStatement
| FIXED OPEN_PARENS pointer_type fixed_pointer_declarators CLOSE_PARENS embedded_statement # fixedStatement
;
block
: OPEN_BRACE statement_list? CLOSE_BRACE
;
local_variable_declaration
: (USING | REF | REF READONLY)? local_variable_type local_variable_declarator (
',' local_variable_declarator { this.IsLocalVariableDeclaration() }?
)*
| FIXED pointer_type fixed_pointer_declarators
;
local_variable_type
: VAR
| type_
;
local_variable_declarator
: identifier ('=' REF? local_variable_initializer)?
;
local_variable_initializer
: expression
| array_initializer
| stackalloc_initializer
;
local_constant_declaration
: CONST type_ constant_declarators
;
if_body
: block
| simple_embedded_statement
;
switch_section
: switch_label+ statement_list
;
switch_label
: CASE expression case_guard? ':'
| DEFAULT ':'
;
case_guard
: WHEN expression
;
statement_list
: statement+
;
for_initializer
: local_variable_declaration
| expression (',' expression)*
;
for_iterator
: expression (',' expression)*
;
catch_clauses
: specific_catch_clause specific_catch_clause* general_catch_clause?
| general_catch_clause
;
specific_catch_clause
: CATCH OPEN_PARENS class_type identifier? CLOSE_PARENS exception_filter? block
;
general_catch_clause
: CATCH exception_filter? block
;
exception_filter // C# 6
: WHEN OPEN_PARENS expression CLOSE_PARENS
;
finally_clause
: FINALLY block
;
resource_acquisition
: local_variable_declaration
| expression
;
//B.2.6 Namespaces;
namespace_declaration
: NAMESPACE qi = qualified_identifier namespace_body ';'?
;
qualified_identifier
: identifier ('.' identifier)*
;
namespace_body
: OPEN_BRACE extern_alias_directives? using_directives? namespace_member_declarations? CLOSE_BRACE
;
extern_alias_directives
: extern_alias_directive+
;
extern_alias_directive
: EXTERN ALIAS identifier ';'
;
using_directives
: using_directive+
;
using_directive
: USING identifier '=' namespace_or_type_name ';' # usingAliasDirective
| USING namespace_or_type_name ';' # usingNamespaceDirective
// C# 6: https://msdn.microsoft.com/en-us/library/ms228593.aspx
| USING STATIC namespace_or_type_name ';' # usingStaticDirective
;
namespace_member_declarations
: namespace_member_declaration+
;
namespace_member_declaration
: namespace_declaration
| type_declaration
;
type_declaration
: attributes? all_member_modifiers? (
class_definition
| struct_definition
| interface_definition
| enum_definition
| delegate_definition
)
;
qualified_alias_member
: identifier '::' identifier type_argument_list?
;
//B.2.7 Classes;
type_parameter_list
: '<' type_parameter (',' type_parameter)* '>'
;
type_parameter
: attributes? identifier
;
class_base
: ':' class_type (',' namespace_or_type_name)*
;
interface_type_list
: namespace_or_type_name (',' namespace_or_type_name)*
;
type_parameter_constraints_clauses
: type_parameter_constraints_clause+
;
type_parameter_constraints_clause
: WHERE identifier ':' type_parameter_constraints
;
type_parameter_constraints
: constructor_constraint
| primary_constraint (',' secondary_constraints)? (',' constructor_constraint)?
;
primary_constraint
: class_type
| CLASS '?'?
| STRUCT
| UNMANAGED
;
// namespace_or_type_name includes identifier
secondary_constraints
: namespace_or_type_name (',' namespace_or_type_name)*
;
constructor_constraint
: NEW OPEN_PARENS CLOSE_PARENS
;
class_body
: OPEN_BRACE class_member_declarations? CLOSE_BRACE
;
class_member_declarations
: class_member_declaration+
;
class_member_declaration
: attributes? all_member_modifiers? (common_member_declaration | destructor_definition)
;
all_member_modifiers
: all_member_modifier+
;
all_member_modifier
: NEW
| PUBLIC
| PROTECTED
| INTERNAL
| PRIVATE
| READONLY
| VOLATILE
| VIRTUAL
| SEALED
| OVERRIDE
| ABSTRACT
| STATIC
| UNSAFE
| EXTERN
| PARTIAL
| ASYNC // C# 5
;
// represents the intersection of struct_member_declaration and class_member_declaration
common_member_declaration
: constant_declaration
| typed_member_declaration
| event_declaration
| conversion_operator_declarator (body | right_arrow throwable_expression ';') // C# 6
| constructor_declaration
| VOID method_declaration
| class_definition
| struct_definition
| interface_definition
| enum_definition
| delegate_definition
;
typed_member_declaration
: (REF | READONLY REF | REF READONLY)? type_ (
namespace_or_type_name '.' indexer_declaration
| method_declaration
| property_declaration
| indexer_declaration
| operator_declaration
| field_declaration
)
;
constant_declarators
: constant_declarator (',' constant_declarator)*
;
constant_declarator
: identifier '=' expression
;
variable_declarators
: variable_declarator (',' variable_declarator)*
;
variable_declarator
: identifier ('=' variable_initializer)?
;
variable_initializer
: expression
| array_initializer
;
return_type
: type_
| VOID
;
member_name
: namespace_or_type_name
;
method_body
: block
| ';'
;
formal_parameter_list
: parameter_array
| fixed_parameters (',' parameter_array)?
;
fixed_parameters
: fixed_parameter (',' fixed_parameter)*
;
fixed_parameter
: attributes? parameter_modifier? arg_declaration
| ARGLIST
;
parameter_modifier
: REF
| OUT
| IN
| REF THIS
| IN THIS
| THIS
;
parameter_array
: attributes? PARAMS array_type identifier
;
accessor_declarations
: attrs = attributes? mods = accessor_modifier? (
GET accessor_body set_accessor_declaration?
| SET accessor_body get_accessor_declaration?
)
;
get_accessor_declaration
: attributes? accessor_modifier? GET accessor_body
;
set_accessor_declaration
: attributes? accessor_modifier? SET accessor_body
;
accessor_modifier
: PROTECTED
| INTERNAL
| PRIVATE
| PROTECTED INTERNAL
| INTERNAL PROTECTED
;
accessor_body
: block
| ';'
;
event_accessor_declarations
: attributes? (ADD block remove_accessor_declaration | REMOVE block add_accessor_declaration)
;
add_accessor_declaration
: attributes? ADD block
;
remove_accessor_declaration
: attributes? REMOVE block
;
overloadable_operator
: '+'
| '-'
| BANG
| '~'
| '++'
| '--'
| TRUE
| FALSE
| '*'
| '/'
| '%'
| '&'
| '|'
| '^'
| '<<'
| right_shift
| OP_EQ
| OP_NE
| '>'
| '<'
| '>='
| '<='
;
conversion_operator_declarator
: (IMPLICIT | EXPLICIT) OPERATOR type_ OPEN_PARENS arg_declaration CLOSE_PARENS
;
constructor_initializer
: ':' (BASE | THIS) OPEN_PARENS argument_list? CLOSE_PARENS
;
body
: block
| ';'
;
//B.2.8 Structs
struct_interfaces
: ':' interface_type_list
;
struct_body
: OPEN_BRACE struct_member_declaration* CLOSE_BRACE
;
struct_member_declaration
: attributes? all_member_modifiers? (
common_member_declaration
| FIXED type_ fixed_size_buffer_declarator+ ';'
)
;
//B.2.9 Arrays
array_type
: base_type (('*' | '?')* rank_specifier)+
;
rank_specifier
: '[' ','* ']'
;
array_initializer
: OPEN_BRACE (variable_initializer (',' variable_initializer)* ','?)? CLOSE_BRACE
;
//B.2.10 Interfaces
variant_type_parameter_list
: '<' variant_type_parameter (',' variant_type_parameter)* '>'
;
variant_type_parameter
: attributes? variance_annotation? identifier
;
variance_annotation
: IN
| OUT
;
interface_base
: ':' interface_type_list
;
interface_body // ignored in csharp 8
: OPEN_BRACE interface_member_declaration* CLOSE_BRACE
;
interface_member_declaration
: attributes? NEW? (
UNSAFE? (REF | REF READONLY | READONLY REF)? type_ (
identifier type_parameter_list? OPEN_PARENS formal_parameter_list? CLOSE_PARENS type_parameter_constraints_clauses? ';'
| identifier OPEN_BRACE interface_accessors CLOSE_BRACE
| THIS '[' formal_parameter_list ']' OPEN_BRACE interface_accessors CLOSE_BRACE
)
| UNSAFE? VOID identifier type_parameter_list? OPEN_PARENS formal_parameter_list? CLOSE_PARENS type_parameter_constraints_clauses? ';'
| EVENT type_ identifier ';'
)
;
interface_accessors
: attributes? (GET ';' (attributes? SET ';')? | SET ';' (attributes? GET ';')?)
;
//B.2.11 Enums
enum_base
: ':' type_
;
enum_body
: OPEN_BRACE (enum_member_declaration (',' enum_member_declaration)* ','?)? CLOSE_BRACE
;
enum_member_declaration
: attributes? identifier ('=' expression)?
;
//B.2.12 Delegates
//B.2.13 Attributes
global_attribute_section
: '[' global_attribute_target ':' attribute_list ','? ']'
;
global_attribute_target
: keyword
| identifier
;
attributes
: attribute_section+
;
attribute_section
: '[' (attribute_target ':')? attribute_list ','? ']'
;
attribute_target
: keyword