Spirit returns full = false in 1.34 if there is trailing spaces in input

[ibaxter@…]

In boost 1.34, if there is a trailing white space characters in an input sequence, parse returns with info.full set to false, even though parsing was (essentially) full. The space_p skip parser is ignored for the last sequence. In 1.33 parsing succeeds as expected.

[biochimia]

The change in behaviour was intentional. It was made on the grounds of consistency (parsers shouldn't consume any more output than what they have matched), as well as to avoid a hang when directly parsing stdin: namely, parse() would hang waiting for a non-whitespace character at the end of a match.

You may workaround this change by adding eps_p or end_p after your grammar, as in:

my_grammar g;
my_skipper skipper;

parse(str, g >> eps_p, skipper); // 1

parse(str, g >> end_p, skipper); // 2

The 2nd option requires a full match, while the first one gets you the previous behaviour without making a full match obligatory.

Here's where the change was first announced, for context:

​http://thread.gmane.org/gmane.comp.parsers.spirit.general/9839

[cdiggins@…]

This new change in behaviour breaks the C parser example in the repository. Others in the repository may be broken as well, I haven't checked.

[Joel de Guzman]

Author (Hartmut Kaiser) notified and web-page note on this issue added. I shall close this now.