Antlr4 - 条款的订货

Question

我有这样的规则：

query 
    : SELECT selectAttribute (',' selectAttribute)* 
     FROM from 
     (WHERE where=booleanExpression)? 
     (ORDER BY sortItem (',' sortItem)*)? 
     (LIMIT limit=(INTEGER_VALUE | ALL))? 
     (IGNOREHIDDENFILES ignoreHiddenFiles=booleanValue)? 
     (FOLLOWSYMLINKS followSymlinks=booleanValue)? 
     SEMICOLON 
    ; 

这是有效的;

SELECT name FROM /tmp 
IGNOREHIDDENFILES true 
FOLLOWSYMLINKS true 

然而，这是无效的：

SELECT name FROM /tmp 
FOLLOWSYMLINKS true 
IGNOREHIDDENFILES true 

我想告诉规则的顺序并不为IGNOREHIDDENFILES和FOLLOWSYMLINKS

Answer 1

只是从我的头顶重要 - 创建一个子规则，并将其用于query中的*。

编辑@NiloPaim在评论中指出后，我所做的改变不使用* wildcard.Something这样的：

query: query_first SEMICOLON 
    | query_first ignoreHiddenFilesPart (followSymlinksPArt)? SEMICOLON 
    | query_first followSymlinksPArt (ignoreHiddenFilesPart)? SEMICOLON 
    ; 
query_first : SELECT selectAttribute (',' selectAttribute)* 
     FROM from 
     (WHERE where=booleanExpression)? 
     (ORDER BY sortItem (',' sortItem)*)? 
     (LIMIT limit=(INTEGER_VALUE | ALL))? 
      ; 
ignoreHiddenFilesPart: IGNOREHIDDENFILES ignoreHiddenFiles=booleanValue ; 
followSymlinksPArt: FOLLOWSYMLINKS followSymlinks=booleanValue ;