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Improve Grammar documentation (#315)

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JohnnyMorganz 2022-01-20 16:27:19 +00:00 committed by GitHub
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docs/_pages/grammar.md
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@ -7,8 +7,6 @@ classes: wide
This is the complete syntax grammar for Luau in EBNF. More information about the terminal nodes String and Number This is the complete syntax grammar for Luau in EBNF. More information about the terminal nodes String and Number
is available in the [syntax section](syntax). is available in the [syntax section](syntax).
> Note: this grammar is currently missing type pack syntax for generic arguments
```ebnf ```ebnf
chunk = block chunk = block
block = {stat [';']} [laststat [';']] block = {stat [';']} [laststat [';']]
@ -24,12 +22,12 @@ stat = varlist '=' explist |
'function' funcname funcbody | 'function' funcname funcbody |
'local' 'function' NAME funcbody | 'local' 'function' NAME funcbody |
'local' bindinglist ['=' explist] | 'local' bindinglist ['=' explist] |
['export'] 'type' NAME ['<' GenericTypeList '>'] '=' Type ['export'] 'type' NAME ['<' GenericTypeParameterList '>'] '=' Type
laststat = 'return' [explist] | 'break' | 'continue' laststat = 'return' [explist] | 'break' | 'continue'
funcname = NAME {'.' NAME} [':' NAME] funcname = NAME {'.' NAME} [':' NAME]
funcbody = '(' [parlist] ')' [':' ReturnType] block 'end' funcbody = ['<' GenericTypeParameterList '>'] '(' [parlist] ')' [':' ReturnType] block 'end'
parlist = bindinglist [',' '...'] | '...' parlist = bindinglist [',' '...'] | '...'
explist = {exp ','} exp explist = {exp ','} exp
@ -60,19 +58,27 @@ unop = '-' | 'not' | '#'
SimpleType = SimpleType =
'nil' | 'nil' |
NAME ['.' NAME] [ '<' TypeList '>' ] | SingletonType |
NAME ['.' NAME] [ '<' [TypeParams] '>' ] |
'typeof' '(' exp ')' | 'typeof' '(' exp ')' |
TableType | TableType |
FunctionType FunctionType
SingletonType = STRING | 'true' | 'false'
Type = Type =
SimpleType ['?'] | SimpleType ['?'] |
SimpleType ['|' Type] | SimpleType ['|' Type] |
SimpleType ['&' Type] SimpleType ['&' Type]
GenericTypeList = NAME ['...'] {',' NAME ['...']} GenericTypePackParameter = NAME '...' ['=' (TypePack | VariadicTypePack | GenericTypePack)]
GenericTypeParameterList = NAME ['=' Type] [',' GenericTypeParameterList] | GenericTypePackParameter {',' GenericTypePackParameter}
TypeList = Type [',' TypeList] | '...' Type TypeList = Type [',' TypeList] | '...' Type
ReturnType = Type | '(' TypeList ')' TypeParams = (Type | TypePack | VariadicTypePack | GenericTypePack) [',' TypeParams]
TypePack = '(' [TypeList] ')'
GenericTypePack = NAME '...'
VariadicTypePack = '...' Type
ReturnType = Type | TypePack
TableIndexer = '[' Type ']' ':' Type TableIndexer = '[' Type ']' ':' Type
TableProp = NAME ':' Type TableProp = NAME ':' Type
TablePropOrIndexer = TableProp | TableIndexer TablePropOrIndexer = TableProp | TableIndexer