10.3. Syntax overview

expression	→	constant | unary-message | binary-message | keyword-message | ‘(’ expression ‘)’
constant	→	self | number | string | object
unary-message	→	receiver unary-send | resend ‘.’ unary-send
unary-send	→	identifier
binary-message	→	receiver binary-send | resend ‘.’ binary-send
binary-send	→	operator expression
keyword-message	→	receiver keyword-send | resend ‘.’ keyword-send
keyword-send	→	small-keyword expression { cap-keyword expression }
receiver	→	[ expression ]
resend	→	resend | identifier
object	→	regular-object | block
regular-object	→	‘(’ [ ‘|’ [ ‘{’ ‘}’ ‘=’ string ] slot-list ‘|’ ] [ code ] ‘)’
block	→	‘[’ [ ‘|’ slot-list ‘|’ ] [ code ] ‘]’
slot-list	→	{ unannotated-slot-list | annotated-slot-list }
annotated-slot-list	→	‘{’ string slot-list ‘}’
unannotated-slot-list	→	{ slot ‘.’} slot [ ‘.’ ]
code	→	{ expression ‘.’} [ ‘^’ ] expression [ ‘.’ ]
slot	→	arg-slot | data-slot | binary-slot | keyword-slot
arg-slot	→	argument-name
data-slot	→	slot-name | slot-name ‘<-’ expression | slot-name ‘=’ expression
unary-slot	→	slot-name ‘=’ regular-object
binary-slot	→	operator ‘=’ regular-object | operator [identifier] ‘=’ regular-object
keyword-slot	→	small-keyword {cap-keyword} ‘=’ regular-object | small-keyword identifier {cap-keyword identifier} ‘=’ regular-object
slot-name	→	identifier | parent-name
parent-name	→	identifier ‘*’