8 - The Complete Syntax of Lua
Here is the complete syntax of Lua in extended BNF. (It does not describe operator precedences.) 


	chunk ::= {stat [';']} [laststat [';']]

	block ::= chunk

	stat ::=  varlist '=' explist | 
		 functioncall | 
		 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] 

	laststat ::= return [explist] | break

	funcname ::= Name {'.' Name} [':' Name]

	varlist ::= var {',' var}

	var ::=  Name | prefixexp '[' exp ']' | prefixexp '.' Name 

	namelist ::= Name {',' Name}

	explist ::= {exp ','} exp

	exp ::=  nil | false | true | Number | String | '...' | function | 
		 prefixexp | tableconstructor | exp binop exp | unop exp 

	prefixexp ::= var | functioncall | '(' exp ')'

	functioncall ::=  prefixexp args | prefixexp ':' Name args 

	args ::=  '(' [explist] ')' | tableconstructor | String 

	function ::= 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 | '#'

