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type.abnf
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; ---------------------------------------------------------------------------- ;
; Type ;
; ---------------------------------------------------------------------------- ;
Type
= Atomic [Union / Intersection]
/ Nullable
ParenthesizedType
= Atomic [Union / Intersection / Conditional]
/ Nullable
Union
= 1*(TokenUnion Atomic)
Intersection
= 1*(TokenIntersection Atomic)
Conditional
= 1*ByteHorizontalWs TokenIs [TokenNot] Atomic TokenNullable Type TokenColon ParenthesizedType
Nullable
= TokenNullable Atomic
Atomic
= TokenIdentifier [Generic / Callable / Array]
/ TokenThisVariable
/ TokenParenthesesOpen ParenthesizedType TokenParenthesesClose [Array]
Generic
= TokenAngleBracketOpen GenericTypeArgument *(TokenComma GenericTypeArgument) TokenAngleBracketClose
GenericTypeArgument
= [TokenContravariant / TokenCovariant] Type
/ TokenWildcard
Callable
= TokenParenthesesOpen [CallableParameters] TokenParenthesesClose TokenColon CallableReturnType
CallableParameters
= CallableParameter *(TokenComma CallableParameter)
CallableParameter
= Type [CallableParameterIsReference] [CallableParameterIsVariadic] [CallableParameterName] [CallableParameterIsOptional]
CallableParameterIsReference
= TokenIntersection
CallableParameterIsVariadic
= TokenVariadic
CallableParameterName
= TokenVariable
CallableParameterIsOptional
= TokenEqualSign
CallableReturnType
= TokenIdentifier [Generic]
/ Nullable
/ TokenParenthesesOpen Type TokenParenthesesClose
Array
= 1*(TokenSquareBracketOpen TokenSquareBracketClose)
ArrayShape
= TokenCurlyBracketOpen ArrayShapeItem *(TokenComma ArrayShapeItem) TokenCurlyBracketClose
ArrayShapeItem
= (ConstantString / ConstantInt / TokenIdentifier) TokenNullable TokenColon Type
/ Type
; ---------------------------------------------------------------------------- ;
; ConstantExpr ;
; ---------------------------------------------------------------------------- ;
ConstantExpr
= ConstantFloat *ByteHorizontalWs
/ ConstantInt *ByteHorizontalWs
/ ConstantTrue *ByteHorizontalWs
/ ConstantFalse *ByteHorizontalWs
/ ConstantNull *ByteHorizontalWs
/ ConstantString *ByteHorizontalWs
/ ConstantArray *ByteHorizontalWs
/ ConstantFetch *ByteHorizontalWs
ConstantFloat
= ["-"] 1*ByteDecDigit "." *ByteDecDigit [ConstantFloatExp]
/ ["-"] 1*ByteDecDigit ConstantFloatExp
/ ["-"] "." 1*ByteDecDigit [ConstantFloatExp]
ConstantFloatExp
= "e" ["-"] 1*ByteDecDigit
ConstantInt
= ["-"] "0b" 1*ByteBinDigit
/ ["-"] "0o" 1*ByteOctDigit
/ ["-"] "0x" 1*ByteHexDigit
/ ["-"] 1*ByteDecDigit
ConstantTrue
= "true"
ConstantFalse
= "false"
ConstantNull
= "null"
ConstantString
= ByteSingleQuote *(ByteBackslash ByteNotEol / ByteNotEolAndNotBackslashAndNotSingleQuote) ByteSingleQuote
/ ByteDoubleQuote *(ByteBackslash ByteNotEol / ByteNotEolAndNotBackslashAndNotDoubleQuote) ByteDoubleQuote
ConstantArray
= TokenSquareBracketOpen [ConstantArrayItems] TokenSquareBracketClose
/ "array" TokenParenthesesOpen [ConstantArrayItems] TokenParenthesesClose
ConstantArrayItems
= ConstantArrayItem *(TokenComma ConstantArrayItem) [TokenComma]
ConstantArrayItem
= ConstantExpr [TokenDoubleArrow ConstantExpr]
ConstantFetch
= TokenIdentifier [TokenDoubleColon ByteIdentifierFirst *ByteIdentifierSecond *ByteHorizontalWs]
; ---------------------------------------------------------------------------- ;
; Tokens ;
; ---------------------------------------------------------------------------- ;
TokenUnion
= "|" *ByteHorizontalWs
TokenIntersection
= "&" *ByteHorizontalWs
TokenNullable
= "?" *ByteHorizontalWs
TokenParenthesesOpen
= "(" *ByteHorizontalWs
TokenParenthesesClose
= ")" *ByteHorizontalWs
TokenAngleBracketOpen
= "<" *ByteHorizontalWs
TokenAngleBracketClose
= ">" *ByteHorizontalWs
TokenSquareBracketOpen
= "[" *ByteHorizontalWs
TokenSquareBracketClose
= "]" *ByteHorizontalWs
TokenCurlyBracketOpen
= "{" *ByteHorizontalWs
TokenCurlyBracketClose
= "}" *ByteHorizontalWs
TokenComma
= "," *ByteHorizontalWs
TokenColon
= ":" *ByteHorizontalWs
TokenVariadic
= "..." *ByteHorizontalWs
TokenEqualSign
= "=" *ByteHorizontalWs
TokenVariable
= "$" ByteIdentifierFirst *ByteIdentifierSecond *ByteHorizontalWs
TokenDoubleArrow
= "=>" *ByteHorizontalWs
TokenDoubleColon
= "::" *ByteHorizontalWs
TokenThisVariable
= %s"$this" *ByteHorizontalWs
TokenIs
= %s"is" 1*ByteHorizontalWs
TokenNot
= %s"not" 1*ByteHorizontalWs
TokenContravariant
= %s"contravariant" 1*ByteHorizontalWs
TokenCovariant
= %s"covariant" 1*ByteHorizontalWs
TokenWildcard
= "*" *ByteHorizontalWs
TokenIdentifier
= [ByteBackslash] ByteIdentifierFirst *ByteIdentifierSecond *(ByteBackslash ByteIdentifierFirst *ByteIdentifierSecond) *ByteHorizontalWs
; ---------------------------------------------------------------------------- ;
; Bytes ;
; ---------------------------------------------------------------------------- ;
ByteHorizontalWs
= %x09 ; horizontal tab
/ %x20 ; space
ByteBinDigit
= %x30-31 ; 0-1
ByteOctDigit
= %x30-37 ; 0-7
ByteDecDigit
= %x30-39 ; 0-9
ByteHexDigit
= %x30-39 ; 0-9
/ %x41-46 ; A-F
/ %x61-66 ; a-f
ByteIdentifierFirst
= %x41-5A ; A-Z
/ %x5F ; _
/ %x61-7A ; a-z
/ %x80-FF
ByteIdentifierSecond
= %x30-39 ; 0-9
/ %x41-5A ; A-Z
/ %x5F ; _
/ %x61-7A ; a-z
/ %x80-FF
ByteSingleQuote
= %x27 ; '
ByteDoubleQuote
= %x22 ; "
ByteBackslash
= %x5C ; \
ByteNotEol
= %x00-09 ; skip LF
/ %x0B-0C ; skip CR
/ %x0E-FF
ByteNotEolAndNotBackslashAndNotSingleQuote
= %x00-09 ; skip LF
/ %x0B-0C ; skip CR
/ %x0E-26 ; skip single quote
/ %x28-5B ; skip backslash
/ %x5D-FF
ByteNotEolAndNotBackslashAndNotDoubleQuote
= %x00-09 ; skip LF
/ %x0B-0C ; skip CR
/ %x0E-21 ; skip double quote
/ %x23-5B ; skip backslash
/ %x5D-FF