Question

So I am having a problem with javacc and skipping comments. I have a multi line comment skip that can contain multiply comments within itself (A comment is anything that appears within /* and a */), I also use this code segement <"//" (~[" "])* " "> to skip a single line comment. Both function independently of one another but when combined, the single line comment seems to break my multi line comment.

该名教授不再承认多线评论,而是将其与其他(<条码>/*、ID等)的组合加以区别。

以下是我关于多线评论和单一线评论技巧的守则:

SKIP:
{
    "/*" {commentnesting++;} : IN_COMMENT
}

<IN_COMMENT> SKIP :
{
    "/*" {commentnesting++;} 
    | "*/" {commentnesting--;
        if(commentnesting == 0) {
            SwitchTo(DEFAULT);
        }
    }
    | <~[]>
}

SKIP :
{
    <"//" (~["
"])* "
">
}

我的问题是:

How can the single line comment cause the multi line comment to break, when they to my relatively new eyes appear to have completely different regexes?
Is their a way to write the single line comment skip , so that it performs the same function as before but doesn t break the multi line comment when the two are used together?

Answer 1

认为这样做就行不通,但你似乎遗漏了某些观点。而不是:

"/*" {commentnesting++;} : IN_COMMENT

......应当:

<"/*"> {commentnesting++;} : IN_COMMENT

......与你的第二个规则类似?

Answer 2

我最后做的是:

TOKEN: {
  < COMMENT_END : "*/" >
}
SPECIAL_TOKEN: {
 < COMMENT_START : "/*" >  {         
        /*currently commented contents are dropped, but they can be attached to the special token*/
        do {
            Token nextToken = this.getNextToken();
                if ("*/".equals(nextToken.image)) {
                        break;
                }
        } while (true);
 }
}

它只是一种bit笑,但它在评论含有其他评论甚至诸如:“* */......”等文字的法典时也发挥了作用。

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