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boost-spiritboost-spirit-qi

How can I require that a parser only returns full matches and not partial in boost spirit?

In my parser, sometimes the grammar accommodates a match on just the first section of an input string. This seems to be normal behavior for phrase_parse(), but is not what I'm looking for in my application.

How can I require that the whole input string match the grammar for a successful parse, rather than returning success on shorter matches that don't consume all of the input string?

Solution

  • Just require qi::eoi at the end:

    bool ok = qi::phrase_parse(f, l, grammar >> eoi, skipper);

    This also works to discard branches that didn't match all input:

    myrule = (legA >> eoi) | (legB >> eoi) | (legC >> eoi);

    See also