Grammar rules

chunk = block

block = {stat} [retstat]

type = Name |
        '(' {type} [‘,’ type] ‘)’  ‘=>’ type

record = ‘type’ Name {‘<’ { Name [‘,’ Name ] } ‘>’} ‘=’ 
                    ‘{‘ {  Name ‘:’ type [  ‘,’  Name ‘:’ type  ]  } ‘}’

typedef =  ‘type’ Name {‘<’ { Name [‘,’ Name ] } ‘>’} ‘=’  Name {‘<’ { Name [‘,’ Name ] } ‘>’}

stat =  ‘;’ | 
     varlist ‘=’ explist | 
     functioncall | 
     label | 
     break | 
     goto Name | 
     record |
     typedef |
     do block end | 
     while exp do block end | 
     repeat block until exp | 
     if exp then block {elseif exp then block} [else block] end | 
     for Name ‘=’ exp ‘,’ exp [‘,’ exp] do block end | 
     for namelist in explist do block end | 
     function funcname funcbody | 
     local function Name funcbody | 
     local namelist [‘=’ explist] 

retstat = return [explist] [‘;’]

label = ‘’ Name ‘’

funcname = Name {‘.’ Name} [‘:’ Name]

varlist = var {‘,’ var}

var =  Name | prefixexp ‘[’ exp ‘]’ | prefixexp ‘.’ Name 

name = Name {‘:’ type } || Name

namelist = name {‘,’ name}

explist = exp {‘,’ exp}

exp =  nil | false | true | Numeral | LiteralString | ‘...’ | functiondef | 
     prefixexp | tableconstructor | exp binop exp | unop exp 

prefixexp = var | functioncall | ‘(’ exp ‘)’

functioncall =  prefixexp args | prefixexp ‘:’ Name args 

args =  ‘(’ [explist] ‘)’ | tableconstructor | LiteralString      

functiondef = function funcbody

funcbody = ‘(’ [parlist] ‘)’ block end

parlist = namelist [‘,’ ‘...’] | ‘...’

tableconstructor = ‘{’ [fieldlist] ‘}’

fieldlist = field {fieldsep field} [fieldsep]

field = ‘[’ exp ‘]’ ‘=’ exp | Name ‘=’ exp | exp

fieldsep = ‘,’ | ‘;’

binop =  ‘+’ | ‘-’ | ‘*’ | ‘/’ | ‘//’ | ‘^’ | ‘%’ | 
     ‘&’ | ‘~’ | ‘|’ | ‘>>’ | ‘<<’ | ‘..’ | 
     ‘<’ | ‘<=’ | ‘>’ | ‘>=’ | ‘==’ | ‘~=’ | 
     and | or

unop = ‘-’ | not | ‘#’ | ‘~’