Browsable Eiffel Grammar

CC-BY

Grammar extracted by Vadim Zaytsev, see the Grammar Zoo entry for details: eiffel/bezault/extracted
Source used for this grammar: Eric Bezault, Eiffel: The Syntax, 1999

Summary

Syntax

Class_declaration ::=
	Indexing? Class_header Formal_generics? Obsolete? Inheritance? Creators? Features? Invariant? "end" ("--" "class" Class_name)?
Indexing ::=
	"indexing" Index_list
Index_list ::=
	(Index_clause ";")*
Index_clause ::=
	Index? Index_terms
Index ::=
	Identifier ":"
Index_terms ::=
	(Index_value ",")+
Index_value ::=
	Identifier
	Manifest_constant
Class_header ::=
	Header_mark? "class" Class_name
Header_mark ::=
	"deferred"
	"expanded"
	"separate"
Class_name ::=
	Identifier
Formal_generics ::=
	Formal_generic_list?
Formal_generic_list ::=
	(Formal_generic ",")*
Formal_generic ::=
	Formal_generic_name Constraint?
Formal_generic_name ::=
	Identifier
Constraint ::=
	"-" ">" Class_type
Obsolete ::=
	"obsolete" Message
Message ::=
	Manifest_string
Inheritance ::=
	"inherit" Parent_list
Parent_list ::=
	(Parent ";")*
Parent ::=
	Class_type Feature_adaptation?
Feature_adaptation ::=
	Rename? New_exports? Undefine? Redefine? Select? "end"
Rename ::=
	"rename" Rename_list
Rename_list ::=
	(Rename_pair ",")*
Rename_pair ::=
	Feature_name "as" Feature_name
New_exports ::=
	"export" New_export_list
New_export_list ::=
	(New_export_item ";")*
New_export_item ::=
	Clients Feature_set
Feature_set ::=
	Feature_list
	"all"
Feature_list ::=
	(Feature_name ",")*
Clients ::=
	"{" Class_list "}"
Class_list ::=
	(Class_name ",")*
Redefine ::=
	"redefine" Feature_list
Undefine ::=
	"undefine" Feature_list
Select ::=
	"select" Feature_list
Creators ::=
	"creation" (Creation_clause "creation")+
Creation_clause ::=
	Clients? Header_comment? Procedure_list
Procedure_list ::=
	(Procedure_name ",")*
Procedure_name ::=
	Identifier
Features ::=
	"feature" (Feature_clause "feature")+
Feature_clause ::=
	Clients? Header_comment? Feature_declaration_list
Feature_declaration_list ::=
	(Feature_declaration ";")*
Feature_declaration ::=
	New_feature_list Declaration_body
Declaration_body ::=
	Formal_arguments? Type_mark? Constant_or_routine?
Constant_or_routine ::=
	"is" Feature_value
Feature_value ::=
	Manifest_constant
	Unique
	Routine
Unique ::=
	"Unique"
New_feature_list ::=
	(New_feature ",")+
New_feature ::=
	"frozen"? Feature_name
Feature_name ::=
	Identifier
	Prefix
	Infix
Prefix ::=
	"prefix" """ Prefix_operator """
Infix ::=
	"infix" """ Infix_operator """
Prefix_operator ::=
	Unary
	Free_operator
Infix_operator ::=
	Binary
	Free_operator
Unary ::=
	"not"
	"+"
	"-"
Binary ::=
	"+"
	"-"
	"*"
	"/"
	"<"
	">"
	"<="
	">="
	"//"
	"\\"
	"^"
	"and"
	"or"
	"xor"
	"and" "then"
	"or" "else"
	"implies"
Formal_arguments ::=
	"(" Entity_declaration_list ")"
Entity_declaration_list ::=
	(Entity_declaration_group ";")*
Entity_declaration_group ::=
	Identifier_list Type_mark
Identifier_list ::=
	(Identifier ",")+
Type_mark ::=
	":" Type
Routine ::=
	Obsolete? Header_comment? Precondition? Local_declarations? Routine_body Postcondition? Rescue? "end" ("--" Feature_name)?
Routine_body ::=
	Effective
	Deferred
Effective ::=
	Internal
	External
Internal ::=
	Routine_mark Compound
Routine_mark ::=
	"do"
	"once"
Deferred ::=
	"deferred"
External ::=
	"external" Language_name External_name?
Language_name ::=
	Manifest_string
External_name ::=
	"alias" Manifest_string
Local_declarations ::=
	"local" Entity_declaration_list
Precondition ::=
	"require" "else"? Assertion
Postcondition ::=
	"ensure" "then"? Assertion
Invariant ::=
	"invariant" Assertion
Assertion ::=
	(Assertion_clause ";")*
Assertion_clause ::=
	Tag_mark? Unlabeled_assertion_clause
Unlabeled_assertion_clause ::=
	Boolean_expression
	Comment
Tag_mark ::=
	Tag ":"
Tag ::=
	Identifier
Rescue ::=
	"rescue" Compound
Type ::=
	Class_type
	Class_type_expanded
	Class_type_separate
	Anchored
	Bit_type
Class_type ::=
	Class_name Actual_generics?
Actual_generics ::=
	Type_list?
Type_list ::=
	(Type ",")*
Class_type_expanded ::=
	"expanded" Class_type
Class_type_separate ::=
	"separate" Class_type
Bit_type ::=
	"BIT" Bit_length
Bit_length ::=
	Integer_constant
	Attribute
Anchored ::=
	"like" Anchor
Anchor ::=
	Identifier
	"Current"
Compound ::=
	(Instruction ";")*
Instruction ::=
	Creation
	Call
	Assignment
	Assignment_attempt
	Conditional
	Multi_branch
	Loop
	Debug
	Check
	Retry
	Null_instruction
Creation ::=
	"!" Type? "!" Writable Creation_call?
Creation_call ::=
	"." Procedure_name Actuals?
Assignment ::=
	Writable ":=" Expression
Assignment_attempt ::=
	Writable "?=" Expression
Conditional ::=
	"if" Then_part_list Else_part? "end"
Then_part_list ::=
	(Then_part "elseif")+
Then_part ::=
	Boolean_expression "then" Compound
Else_part ::=
	"else" Compound
Multi_branch ::=
	"inspect" Expression When_part_list? Else_part? "end"
When_part_list ::=
	"when" (When_part "when")+
When_part ::=
	Choices "then" Compound
Choices ::=
	(Choice ",")*
Choice ::=
	Choice_constant
	Interval
Interval ::=
	Choice_constant ".." Choice_constant
Choice_constant ::=
	Integer_constant
	Character_constant
	Attribute
Loop ::=
	Initialization Invariant? Variant? Loop_body "end"
Initialization ::=
	"from" Compound
Variant ::=
	"variant" Tag_mark? Expression
Loop_body ::=
	Exit "loop" Compound
Exit ::=
	"until" Boolean_expression
Debug ::=
	"debug" Debug_keys? Compound "end"
Debug_keys ::=
	"(" Debug_key_list ")"
Debug_key_list ::=
	(Debug_key ",")*
Debug_key ::=
	Manifest_string
Check ::=
	"check" Assertion "end"
Retry ::=
	"retry"
Null_instruction ::=
	ε
Call ::=
	Qualified_call
	Precursor
Qualified_call ::=
	Call_qualifier? Call_chain
Call_qualifier ::=
	Call_target "."
Call_target ::=
	Parenthesized
	"Result"
	"Current"
	Precursor
Call_chain ::=
	(Unqualified_call ".")+
Unqualified_call ::=
	Identifier Actuals?
Precursor ::=
	Parent_qualification? "Precursor" Actuals?
Parent_qualification ::=
	"{" Class_name "}"
Attribute ::=
	Identifier
Writable ::=
	Identifier
	"Result"
Actuals ::=
	"(" Actual_list ")"
Actual_list ::=
	(Actual ",")*
Actual ::=
	Expression
	Address
Address ::=
	"$" Address_mark
Address_mark ::=
	Feature_name
	"Current"
	"Result"
Expression ::=
	"Current"
	"Result"
	Call
	Operator_expression
	Equality
	Manifest_array
	Old
	Strip
	Boolean_constant
	Bit_constant
	Integer
	Real
	Manifest_string
	Character_constant
	Wide_character_constant
	Wide_manifest_string
	Hexadecimal_constant
Boolean_expression ::=
	Expression
Operator_expression ::=
	Parenthesized
	Unary_expression
	Binary_expression
Parenthesized ::=
	"(" Expression ")"
Unary_expression ::=
	Prefix_operator Expression
Binary_expression ::=
	Expression Infix_operator Expression
Equality ::=
	Expression Comparison Expression
Comparison ::=
	"="
	"/="
Manifest_constant ::=
	Boolean_constant
	Character_constant
	Integer_constant
	Real_constant
	Manifest_string
	Bit_constant
	Wide_character_constant
	Wide_manifest_string
	Hexadecimal_constant
Boolean_constant ::=
	"True"
	"False"
Integer_constant ::=
	Sign? Integer
Real_constant ::=
	Sign? Real
Sign ::=
	"+"
	"-"
Wide_character_constant ::=
	"$" Character_constant
Wide_manifest_string ::=
	"$" Manifest_string
Manifest_array ::=
	"<<" Expression_list ">>"
Expression_list ::=
	(Expression ",")*
Old ::=
	"old" Expression
Strip ::=
	"Strip" "(" Attribute_list ")"
Attribute_list ::=
	(Attribute ",")*
GrammarLabMaintained by Dr. Vadim Zaytsev a.k.a. @grammarware. Last updated in September 2015. [↑]