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Code Issues Releases Wiki Activity

ircd::json: Allow multiple attributes to the printer; simplify printer stack.

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This commit is contained in:
Jason Volk 2018-02-18 14:15:24 -08:00
parent 42a22a6c79
commit 89ca9c9b24
1 changed files with 38 additions and 37 deletions
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75
ircd/json.cc
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@ -39,7 +39,6 @@ namespace ircd::json
using karma::long_;
using karma::double_;
using karma::bool_;
using karma::maxwidth;
using karma::eps;
using karma::attr_cast;
@ -282,18 +281,12 @@ const ircd::json::parser;
struct ircd::json::printer
:output<char *>
{
template<class generator,
class attribute>
bool operator()(char *&out, char *const &stop, generator&& gen, attribute&& a) const;
template<class gen,
class... attr>
bool operator()(mutable_buffer &out, gen&&, attr&&...) const;
template<class generator>
bool operator()(char *&out, char *const &stop, generator&& gen) const;
template<class... args>
bool operator()(mutable_buffer &out, args&&... a) const
{
return operator()(begin(out), end(out), std::forward<args>(a)...);
}
template<class gen>
bool operator()(mutable_buffer &out, gen&&) const;
template<class it_a,
class it_b,
@ -309,56 +302,64 @@ struct ircd::json::ostreamer
const ircd::json::ostreamer;
template<class gen,
class attr>
class... attr>
bool
ircd::json::printer::operator()(char *&out,
char *const &stop,
ircd::json::printer::operator()(mutable_buffer &out,
gen&& g,
attr&& a)
attr&&... a)
const
{
const auto throws{[&out, &stop]
const auto maxwidth
{
throw print_error
{
"Failed to print attribute '%s' generator '%s' (%zd bytes in buffer)",
demangle<decltype(a)>(),
demangle<decltype(g)>(),
size_t(stop - out)
};
}};
karma::maxwidth(size(out))
};
const auto gg
{
maxwidth(size_t(stop - out))[std::forward<gen>(g)] | eps[throws]
maxwidth[std::forward<gen>(g)]
};
return karma::generate(out, gg, std::forward<attr>(a));
const auto throws{[&out]
{
throw print_error
{
"Failed to print attributes '%s' generator '%s' (%zd bytes in buffer)",
demangle<decltype(a)...>(),
demangle<decltype(g)>(),
size(out)
};
}};
return karma::generate(begin(out), gg | eps[throws], std::forward<attr>(a)...);
}
template<class gen>
bool
ircd::json::printer::operator()(char *&out,
char *const &stop,
ircd::json::printer::operator()(mutable_buffer &out,
gen&& g)
const
{
const auto throws{[&out, &stop]
const auto maxwidth
{
karma::maxwidth(size(out))
};
const auto gg
{
maxwidth[std::forward<gen>(g)]
};
const auto throws{[&out]
{
throw print_error
{
"Failed to print generator '%s' (%zd bytes in buffer)",
demangle<decltype(g)>(),
size_t(stop - out)
size(out)
};
}};
const auto gg
{
maxwidth(size_t(stop - out))[std::forward<gen>(g)] | eps[throws]
};
return karma::generate(out, gg);
return karma::generate(begin(out), gg | eps[throws]);
}
template<class it_a,