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ircd::spirit: Add a template for the common expectation failure rethrow integration.

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This commit is contained in:
Jason Volk 2018-10-02 17:16:48 -07:00
parent a893c1e0a7
commit 1cf0b629cb
2 changed files with 50 additions and 4 deletions
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47
include/ircd/spirit.h
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@ -81,6 +81,10 @@ namespace ircd::spirit
using karma::attr_cast;
using karma::maxwidth;
using karma::buffer;
template<class parent_error> struct expectation_failure;
extern thread_local char rulebuf[64]; // parse.cc
}
namespace ircd::spirit::local
@ -89,3 +93,46 @@ namespace ircd::spirit::local
using qi::_2;
using qi::_3;
}
template<class parent_error>
struct ircd::spirit::expectation_failure
:parent_error
{
template<class it = const char *>
expectation_failure(const qi::expectation_failure<it> &e,
const ssize_t &show_max = 64);
template<class it = const char *>
expectation_failure(const qi::expectation_failure<it> &e,
const it &start,
const ssize_t &show_max = 64);
};
template<class parent>
template<class it>
ircd::spirit::expectation_failure<parent>::expectation_failure(const qi::expectation_failure<it> &e,
const ssize_t &show_max)
:parent
{
"Expected %s. You input %zd invalid characters :%s",
ircd::string(rulebuf, e.what_),
std::distance(e.first, e.last),
string_view{e.first, e.first + std::min(std::distance(e.first, e.last), show_max)}
}
{}
template<class parent>
template<class it>
ircd::spirit::expectation_failure<parent>::expectation_failure(const qi::expectation_failure<it> &e,
const it &start,
const ssize_t &show_max)
:parent
{
"Expected %s. You input %zd invalid characters somewhere between position %zd and %zd: %s",
ircd::string(rulebuf, e.what_),
std::distance(e.first, e.last),
std::distance(start, e.first),
std::distance(start, e.last),
string_view{e.first, e.first + std::min(std::distance(e.first, e.last), show_max)}
}
{}

7
ircd/parse.cc
View file

@ -23,11 +23,10 @@
* USA
*/
namespace ircd
{
}
#include <ircd/spirit.h>
decltype(ircd::spirit::rulebuf) thread_local
ircd::spirit::rulebuf;
//
// Museum of historical comments