利用EBNF生成Syntax/Railroad Diagram

有一个在线生成工具：http://railroad.my28msec.com/rr/ui

示例1：来自Stack Overflow

 

object ::= '{' ((string ':' value ) ( ',' string ':' value )*)? '}'

 

示例2：包含+, -, *,括号的算术表达式描述(EBNF)

 

exp     ::= term (addop term)*
term    ::= factor ('*' factor)*
addop   ::= '+'
         |'-'
factor  ::= '(' exp ')'
          |  [0-9]+

得到的Syntax/Railroad Diagram

 

exp:

exp ::= term ( addopterm )*

referenced by:factor

term:

term ::= factor ( '*' factor )*

referenced by:exp

addop:

addop ::= '+' | '-'

referenced by:exp

factor:

factor ::= '(' exp ')' | [0-9]+

referenced by:term

更多示例

http://download.csdn.net/detail/taotaoyouarebaby/5222326 描述C-

http://download.csdn.net/detail/taotaoyouarebaby/5222098 描述 TINY