lua BNF

最新推荐文章于 2021-12-11 09:48:21 发布

转载最新推荐文章于 2021-12-11 09:48:21 发布 · 932 阅读

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本文详细介绍了Lua编程语言的完整语法结构，包括块、语句、表达式等组成部分，并提供了各种语法元素的具体定义。

Here is the complete syntax of Lua in extended BNF. (It does not describe operator precedences.)

	chunk ::= {stat [`;´]} [laststat [`;´]]

	block ::= chunk

	stat ::=  varlist1 `=´ explist1 | 
		 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 explist1 do block end | 
		 function funcname funcbody | 
		 local function Name funcbody | 
		 local namelist [`=´ explist1] 

	laststat ::= return [explist1] | break

	funcname ::= Name {`.´ Name} [`:´ Name]

	varlist1 ::= var {`,´ var}

	var ::=  Name | prefixexp `[´ exp `]´ | prefixexp `.´ Name 

	namelist ::= Name {`,´ Name}

	explist1 ::= {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 ::=  `(´ [explist1] `)´ | tableconstructor | String 

	function ::= function funcbody

	funcbody ::= `(´ [parlist1] `)´ block end

	parlist1 ::= namelist [`,´ `...´] | `...´

	tableconstructor ::= `{´ [fieldlist] `}´

	fieldlist ::= field {fieldsep field} [fieldsep]

	field ::= `[´ exp `]´ `=´ exp | Name `=´ exp | exp

	fieldsep ::= `,´ | `;´

	binop ::= `+´ | `-´ | `*´ | `/´ | `^´ | `%´ | `..´ | 
		 `<´ | `<=´ | `>´ | `>=´ | `==´ | `~=´ | 
		 and | or

	unop ::= `-´ | not | `#´