CODEWITHSUNDEEP
c++parsingwarningsboost-spiritboost-spirit-qi
user222202
user222202

Reputation: 533

Boost.Spirit.Qi: How to report parser warnings?

How to report parser warnings? Similar to reporting error, but the parser must not stop. Only log warning message and the subexpression caused the warning.

Example input: 

 select * from table where row>='' && row<>'hello'

Expected output:

 Warning: expression is always true: row>=''
 Warning: && is deprecated, use AND: row>='' && row<>'hello'
 Warning: <> is deprecated, use !=: row<>'hello'

Upvotes: 4

Views: 446

Answers (1)

hkaiser
hkaiser

Reputation: 11521

If you want to continue parsing you can register an error handler as before, except that you have to specify accept as the handlers policy:

rule<Iterator> r = ... > !eps;
on_error<accept>(r, handler);

The appended > !eps forces the error in any case and invokes the handler as usual, but it will accept the match after the 'error', continuing as if nothing happened.

Upvotes: 4

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