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construct/ircd/json.cc

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55 KiB
C++

// Matrix Construct
//
// Copyright (C) Matrix Construct Developers, Authors & Contributors
// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice is present in all copies. The
// full license for this software is available in the LICENSE file.
#include <ircd/spirit.h>
#include <boost/fusion/include/at.hpp>
namespace ircd::json
{
using namespace ircd::spirit;
template<class it> struct input;
template<class it> struct output;
// Instantiations of the grammars
struct parser extern const parser;
struct printer extern const printer;
struct ostreamer extern const ostreamer;
}
BOOST_FUSION_ADAPT_STRUCT
(
ircd::json::member,
( decltype(ircd::json::member::first), first )
( decltype(ircd::json::member::second), second )
)
BOOST_FUSION_ADAPT_STRUCT
(
ircd::json::object::member,
( decltype(ircd::json::object::member::first), first )
( decltype(ircd::json::object::member::second), second )
)
template<class it>
struct ircd::json::input
:qi::grammar<it, unused_type>
{
template<class T = unused_type> using rule = qi::rule<it, T>;
rule<> NUL { lit('\0') ,"nul" };
// insignificant whitespaces
rule<> SP { lit('\x20') ,"space" };
rule<> HT { lit('\x09') ,"horizontal tab" };
rule<> CR { lit('\x0D') ,"carriage return" };
rule<> LF { lit('\x0A') ,"line feed" };
// whitespace skipping
rule<> WS { SP | HT | CR | LF ,"whitespace" };
rule<> ws { *(WS) ,"whitespace monoid" };
rule<> wsp { +(WS) ,"whitespace semigroup" };
// structural
rule<> object_begin { lit('{') ,"object begin" };
rule<> object_end { lit('}') ,"object end" };
rule<> array_begin { lit('[') ,"array begin" };
rule<> array_end { lit(']') ,"array end" };
rule<> name_sep { lit(':') ,"name sep" };
rule<> value_sep { lit(',') ,"value sep" };
rule<> escape { lit('\\') ,"escape" };
rule<> quote { lit('"') ,"quote" };
// literal
rule<> lit_false { lit("false") ,"literal false" };
rule<> lit_true { lit("true") ,"literal true" };
rule<> lit_null { lit("null") ,"null" };
rule<> boolean { lit_true | lit_false ,"boolean" };
rule<> literal { lit_true | lit_false | lit_null ,"literal" };
// numerical (TODO: exponent)
rule<> number
{
double_ | long_
,"number"
};
// string
rule<> unicode
{
lit('u') >> qi::uint_parser<uint64_t, 16, 1, 12>{}
,"escaped unicode"
};
rule<> escaped
{
lit('"') | lit('\\') | lit('\b') | lit('\f') | lit('\n') | lit('\r') | lit('\t') | lit('\0')
,"escaped"
};
rule<> escaper
{
lit('"') | lit('\\') | lit('b') | lit('f') | lit('n') | lit('r') | lit('t') | lit('0') | unicode
,"escaped"
};
rule<> escaper_nc
{
escaper | lit('/')
};
rule<string_view> chars
{
raw[*((char_ - escaped) | (escape >> escaper_nc))]
,"characters"
};
rule<string_view> string
{
quote >> chars >> (!escape >> quote)
,"string"
};
// container
rule<string_view> name
{
string
,"name"
};
// recursion depth
_r1_type depth;
[[noreturn]] static void throws_exceeded();
const rule<unused_type(uint)> member
{
name >> -ws >> name_sep >> -ws >> value(depth)
,"member"
};
const rule<unused_type(uint)> object
{
(eps(depth < json::object::max_recursion_depth) | eps[throws_exceeded]) >>
object_begin >> -((-ws >> member(depth)) % (-ws >> value_sep)) >> -ws >> object_end
,"object"
};
const rule<unused_type(uint)> array
{
(eps(depth < json::array::max_recursion_depth) | eps[throws_exceeded]) >>
array_begin >> -((-ws >> value(depth)) % (-ws >> value_sep)) >> -ws >> array_end
,"array"
};
const rule<unused_type(uint)> value
{
lit_false | lit_null | lit_true | string | number | object(depth + 1) | array(depth + 1)
,"value"
};
rule<int> type
{
(omit[quote] >> attr(json::STRING)) |
(omit[object_begin] >> attr(json::OBJECT)) |
(omit[array_begin] >> attr(json::ARRAY)) |
(omit[number >> eoi] >> attr(json::NUMBER)) |
(omit[literal >> eoi] >> attr(json::LITERAL))
,"type"
};
input()
:input::base_type{rule<>{}}
{}
};
template<class it>
struct ircd::json::output
:karma::grammar<it, unused_type>
{
template<class T = unused_type> using rule = karma::rule<it, T>;
rule<> NUL { lit('\0') ,"nul" };
// insignificant whitespaces
rule<> SP { lit('\x20') ,"space" };
rule<> HT { lit('\x09') ,"horizontal tab" };
rule<> CR { lit('\x0D') ,"carriage return" };
rule<> LF { lit('\x0A') ,"line feed" };
// whitespace skipping
rule<> WS { SP | HT | CR | LF ,"whitespace" };
rule<> ws { *(WS) ,"whitespace monoid" };
rule<> wsp { +(WS) ,"whitespace semigroup" };
// structural
rule<> object_begin { lit('{') ,"object begin" };
rule<> object_end { lit('}') ,"object end" };
rule<> array_begin { lit('[') ,"array begin" };
rule<> array_end { lit(']') ,"array end" };
rule<> name_sep { lit(':') ,"name separator" };
rule<> value_sep { lit(',') ,"value separator" };
rule<> quote { lit('"') ,"quote" };
rule<> escape { lit('\\') ,"escape" };
rule<string_view> lit_true { karma::string("true") ,"literal true" };
rule<string_view> lit_false { karma::string("false") ,"literal false" };
rule<string_view> lit_null { karma::string("null") ,"literal null" };
rule<string_view> boolean { lit_true | lit_false ,"boolean" };
rule<string_view> literal { lit_true | lit_false | lit_null ,"literal" };
rule<string_view> number
{
double_
,"number"
};
rule<string_view> quoted
{
char_('"') << *char_ << char_('"')
};
rule<string_view> unquoted
{
quote << *char_ << quote
};
rule<string_view> string
{
quoted | unquoted
,"string"
};
rule<string_view> name
{
string
,"name"
};
rule<json::object> object
{
object_begin << -(member % value_sep) << object_end
,"object"
};
rule<json::array> array
{
array_begin << -(value % value_sep) << array_end
,"array"
};
rule<json::object::member> member
{
name << name_sep << value
,"member"
};
rule<string_view> value
{
(&object << object)
| (&array << array)
| (&literal << literal)
| (&number << number)
| string
,"value"
};
output()
:output::base_type{rule<>{}}
{}
};
struct ircd::json::expectation_failure
:parse_error
{
expectation_failure(const char *const &start,
const qi::expectation_failure<const char *> &e,
const ssize_t &show_max = 64)
:parse_error
{
"Expected %s. You input %zd invalid characters at position %zd: %s",
ircd::string(e.what_),
std::distance(e.first, e.last),
std::distance(start, e.first),
string_view{e.first, e.first + std::min(std::distance(e.first, e.last), show_max)}
}{}
};
struct ircd::json::parser
:input<const char *>
{
using input::input;
}
const ircd::json::parser;
struct ircd::json::printer
:output<char *>
{
template<class gen,
class... attr>
bool operator()(mutable_buffer &out, gen&&, attr&&...) const;
template<class gen>
bool operator()(mutable_buffer &out, gen&&) const;
template<class it_a,
class it_b,
class closure>
static void list_protocol(mutable_buffer &, it_a begin, const it_b &end, closure&&);
}
const ircd::json::printer;
struct ircd::json::ostreamer
:output<karma::ostream_iterator<char>>
{
}
const ircd::json::ostreamer;
template<class gen,
class... attr>
bool
ircd::json::printer::operator()(mutable_buffer &out,
gen&& g,
attr&&... a)
const
{
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 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()(mutable_buffer &out,
gen&& g)
const
{
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(out)
};
}};
return karma::generate(begin(out), gg | eps[throws]);
}
template<class it_a,
class it_b,
class closure>
void
ircd::json::printer::list_protocol(mutable_buffer &buffer,
it_a it,
const it_b &end,
closure&& lambda)
{
if(it != end)
{
lambda(buffer, *it);
for(++it; it != end; ++it)
{
json::printer(buffer, json::printer.value_sep);
lambda(buffer, *it);
}
}
}
template<class it>
void
ircd::json::input<it>::throws_exceeded()
{
throw recursion_limit
{
"Maximum recursion depth exceeded"
};
}
///////////////////////////////////////////////////////////////////////////////
//
// stack.h
//
ircd::json::stack::stack(const mutable_buffer &buf,
flush_callback flusher,
const size_t &hiwat,
const size_t &lowat)
:buf{buf}
,flusher{std::move(flusher)}
,hiwat{hiwat}
,lowat{lowat}
{
}
ircd::json::stack::stack(stack &&other)
noexcept
:buf{std::move(other.buf)}
,flusher{std::move(other.flusher)}
,eptr{std::move(other.eptr)}
,hiwat{std::move(other.hiwat)}
,lowat{std::move(other.lowat)}
,co{std::move(other.co)}
,ca{std::move(other.ca)}
{
other.co = nullptr;
other.ca = nullptr;
}
ircd::json::stack::~stack()
noexcept
{
assert(clean() || done());
}
void
ircd::json::stack::append(const string_view &s)
{
append(size(s), [&s](const mutable_buffer &buf)
{
return copy(buf, s);
});
}
void
ircd::json::stack::append(const size_t &expect,
const window_buffer::closure &closure)
try
{
if(unlikely(eptr))
return;
if(expect > buf.remaining())
{
if(unlikely(!flusher)) throw print_error
{
"Insufficient buffer. I need %zu more bytes; you only have %zu left (of %zu).",
expect,
buf.remaining(),
size(buf.base)
};
if(!flush(true))
return;
if(unlikely(expect > buf.remaining())) throw print_error
{
"Insufficient flush. I still need %zu more bytes to buffer.",
expect - buf.remaining()
};
}
buf([&closure](const mutable_buffer &buf)
{
return closure(buf);
});
if(!buf.remaining())
flush(true);
else if(buf.consumed() >= hiwat)
flush();
}
catch(...)
{
assert(!this->eptr);
this->eptr = std::current_exception();
}
void
ircd::json::stack::rethrow_exception()
{
if(unlikely(eptr))
std::rethrow_exception(eptr);
}
bool
ircd::json::stack::flush(const bool &force)
try
{
if(!flusher)
return false;
if(unlikely(eptr))
return false;
if(!force && buf.consumed() < lowat)
return false;
// The user returns the portion of the buffer they were able to flush
// rather than forcing them to wait on their sink to flush the whole
// thing, they can continue with us for a little while more.
const const_buffer flushed
{
flusher(buf.completed())
};
assert(data(flushed) == data(buf.completed())); // Can only flush front sry
buf.shift(size(flushed));
return true;
}
catch(...)
{
assert(!this->eptr);
this->eptr = std::current_exception();
return false;
}
void
ircd::json::stack::clear()
{
buf.rewind(buf.consumed());
this->eptr = std::exception_ptr{};
}
ircd::const_buffer
ircd::json::stack::completed()
const
{
return buf.completed();
}
size_t
ircd::json::stack::remaining()
const
{
return buf.remaining();
}
bool
ircd::json::stack::done()
const
{
return closed() && buf.consumed();
}
bool
ircd::json::stack::clean()
const
{
return closed() && !buf.consumed();
}
bool
ircd::json::stack::closed()
const
{
return !opened();
}
bool
ircd::json::stack::opened()
const
{
return co || ca;
}
//
// object
//
ircd::json::stack::object::object(object &&other)
noexcept
:s{std::move(other.s)}
,pm{std::move(other.pm)}
,pa{std::move(other.pa)}
,cm{std::move(other.cm)}
,mc{std::move(other.mc)}
{
other.s = nullptr;
}
ircd::json::stack::object::object(stack &s)
:s{&s}
{
assert(s.clean());
s.co = this;
s.append("{"_sv);
}
ircd::json::stack::object::object(member &pm)
:s{pm.s}
,pm{&pm}
{
assert(s->opened());
s->rethrow_exception();
assert(pm.co == nullptr);
assert(pm.ca == nullptr);
pm.co = this;
s->append("{"_sv);
}
ircd::json::stack::object::object(array &pa)
:s{pa.s}
,pa{&pa}
{
assert(s->opened());
s->rethrow_exception();
assert(pa.co == nullptr);
assert(pa.ca == nullptr);
pa.co = this;
if(pa.vc)
s->append(","_sv);
s->append("{"_sv);
}
ircd::json::stack::object::~object()
noexcept
{
if(!s)
return; // std::move()'ed away
const unwind _{[this]
{
// Allows ~dtor to be called to close the JSON manually
s = nullptr;
}};
assert(cm == nullptr);
s->append("}"_sv);
if(pm) // branch taken if member of object
{
assert(pa == nullptr);
assert(pm->ca == nullptr);
assert(pm->co == this);
pm->co = nullptr;
return;
}
if(pa) // branch taken if value in array
{
assert(pm == nullptr);
assert(pa->ca == nullptr);
assert(pa->co == this);
pa->vc++;
pa->co = nullptr;
return;
}
// branch taken if top of stack:: (w/ final flush)
assert(s->co == this);
assert(s->ca == nullptr);
assert(pm == nullptr && pa == nullptr);
s->co = nullptr;
assert(s->done());
s->flush(true);
}
//
// array
//
ircd::json::stack::array::array(array &&other)
noexcept
:s{std::move(other.s)}
,pm{std::move(other.pm)}
,pa{std::move(other.pa)}
,co{std::move(other.co)}
,ca{std::move(other.ca)}
,vc{std::move(other.vc)}
{
other.s = nullptr;
}
ircd::json::stack::array::array(stack &s)
:s{&s}
{
assert(s.clean());
s.ca = this;
s.append("["_sv);
}
ircd::json::stack::array::array(member &pm)
:s{pm.s}
,pm{&pm}
{
assert(s->opened());
s->rethrow_exception();
assert(pm.co == nullptr);
assert(pm.ca == nullptr);
pm.ca = this;
s->append("["_sv);
}
ircd::json::stack::array::array(array &pa)
:s{pa.s}
,pa{&pa}
{
assert(s->opened());
s->rethrow_exception();
assert(pa.co == nullptr);
assert(pa.ca == nullptr);
pa.ca = this;
if(pa.vc)
s->append(","_sv);
s->append("["_sv);
}
ircd::json::stack::array::~array()
noexcept
{
if(!s)
return; // std::move()'ed away
const unwind _{[this]
{
// Allows ~dtor to be called to close the JSON manually
s = nullptr;
}};
assert(co == nullptr);
assert(ca == nullptr);
s->append("]"_sv);
if(pm) // branch taken if member of object
{
assert(pa == nullptr);
assert(pm->ca == this);
assert(pm->co == nullptr);
pm->ca = nullptr;
return;
}
if(pa) // branch taken if value in array
{
assert(pm == nullptr);
assert(pa->ca == this);
assert(pa->co == nullptr);
pa->vc++;
pa->ca = nullptr;
return;
}
// branch taken if top of stack:: (w/ final flush)
assert(s->ca == this);
assert(s->co == nullptr);
assert(pm == nullptr && pa == nullptr);
s->ca = nullptr;
assert(s->done());
s->flush(true);
}
void
ircd::json::stack::array::append(const json::value &value)
{
assert(s);
_pre_append();
const unwind post{[this]
{
_post_append();
}};
s->append(serialized(value), [&value]
(mutable_buffer buf)
{
return size(stringify(buf, value));
});
}
void
ircd::json::stack::array::_pre_append()
{
if(vc)
s->append(","_sv);
}
void
ircd::json::stack::array::_post_append()
{
++vc;
}
//
// member
//
ircd::json::stack::member::member(member &&other)
noexcept
:s{std::move(other.s)}
,po{std::move(other.po)}
,name{std::move(other.name)}
,co{std::move(other.co)}
,ca{std::move(other.ca)}
{
other.s = nullptr;
}
ircd::json::stack::member::member(object &po,
const string_view &name)
:s{po.s}
,po{&po}
,name{name}
{
assert(s->opened());
s->rethrow_exception();
assert(po.cm == nullptr);
po.cm = this;
if(po.mc)
s->append(","_sv);
thread_local char tmp[2048];
mutable_buffer buf{tmp};
if(!printer(buf, json::printer.name << json::printer.name_sep, name))
throw error
{
"member name overflow: max size is under %zu", sizeof(tmp)
};
assert(data(buf) >= tmp);
s->append(string_view{tmp, size_t(data(buf) - tmp)});
}
ircd::json::stack::member::member(object &po,
const string_view &name,
const json::value &value)
:member{po, name}
{
append(value);
}
ircd::json::stack::member::~member()
noexcept
{
if(!s)
return; // std::move()'ed away
const unwind _{[this]
{
// Allows ~dtor to be called to close the JSON manually
s = nullptr;
}};
assert(co == nullptr);
assert(ca == nullptr);
assert(po);
assert(po->cm == this);
po->mc++;
po->cm = nullptr;
}
void
ircd::json::stack::member::append(const json::value &value)
{
assert(s);
_pre_append();
const unwind post{[this]
{
_post_append();
}};
s->append(serialized(value), [&value]
(mutable_buffer buf)
{
return size(stringify(buf, value));
});
}
void
ircd::json::stack::member::_pre_append()
{
}
void
ircd::json::stack::member::_post_append()
{
}
///////////////////////////////////////////////////////////////////////////////
//
// iov.h
//
decltype(ircd::json::iov::MAX_SIZE)
ircd::json::iov::MAX_SIZE
{
1024
};
std::ostream &
ircd::json::operator<<(std::ostream &s, const iov &iov)
{
s << json::strung(iov);
return s;
}
ircd::string_view
ircd::json::stringify(mutable_buffer &buf,
const iov &iov)
{
const ctx::critical_assertion ca;
thread_local const member *m[iov.MAX_SIZE];
if(unlikely(size_t(iov.size()) > iov.MAX_SIZE))
throw iov::oversize
{
"IOV has %zd members but maximum is %zu", iov.size(), iov.MAX_SIZE
};
std::transform(std::begin(iov), std::end(iov), m, []
(const member &m)
{
return &m;
});
std::sort(m, m + iov.size(), []
(const member *const &a, const member *const &b)
{
return *a < *b;
});
static const auto print_member
{
[](mutable_buffer &buf, const member *const &m)
{
printer(buf, printer.name << printer.name_sep, m->first);
stringify(buf, m->second);
}
};
char *const start{begin(buf)};
printer(buf, printer.object_begin);
printer::list_protocol(buf, m, m + iov.size(), print_member);
printer(buf, printer.object_end);
const string_view ret
{
start, begin(buf)
};
assert(serialized(iov) == size(ret));
return ret;
}
size_t
ircd::json::serialized(const iov &iov)
{
const size_t ret
{
1U + iov.empty()
};
return std::accumulate(std::begin(iov), std::end(iov), ret, []
(auto ret, const auto &member)
{
return ret += serialized(member) + 1;
});
}
ircd::json::value &
ircd::json::iov::at(const string_view &key)
{
const auto it
{
std::find_if(std::begin(*this), std::end(*this), [&key]
(const auto &member)
{
return string_view{member.first} == key;
})
};
if(it == std::end(*this))
throw not_found
{
"key '%s' not found", key
};
return it->second;
}
const ircd::json::value &
ircd::json::iov::at(const string_view &key)
const
{
const auto it
{
std::find_if(std::begin(*this), std::end(*this), [&key]
(const auto &member)
{
return string_view{member.first} == key;
})
};
if(it == std::end(*this))
throw not_found
{
"key '%s' not found", key
};
return it->second;
}
bool
ircd::json::iov::has(const string_view &key)
const
{
return std::any_of(std::begin(*this), std::end(*this), [&key]
(const auto &member)
{
return string_view{member.first} == key;
});
}
ircd::json::iov::push::push(iov &iov,
member member)
:node
{
iov, std::move(member)
}
{
}
ircd::json::iov::push::push(iov &iov,
const bool &b,
const conditional_member &cp)
:node
{
b?
&iov:
nullptr,
b?
member{cp.first, cp.second()}:
member{}
}
{
}
ircd::json::iov::add::add(iov &iov,
member member)
:node
{
iov, [&iov, &member]
{
if(iov.has(member.first))
throw exists
{
"failed to add member '%s': already exists",
string_view{member.first}
};
return std::move(member);
}()
}
{
}
ircd::json::iov::add::add(iov &iov,
const bool &b,
const conditional_member &cp)
:node
{
b?
&iov:
nullptr,
[&iov, &b, &cp]
{
if(!b)
return member{};
if(iov.has(cp.first))
throw exists
{
"failed to add member '%s': already exists",
string_view{cp.first}
};
return member
{
cp.first, cp.second()
};
}()
}
{
}
ircd::json::iov::set::set(iov &iov,
member member)
:node
{
iov, [&iov, &member]
{
iov.remove_if([&member](const auto &existing)
{
return string_view{existing.first} == string_view{member.first};
});
return std::move(member);
}()
}
{
}
ircd::json::iov::set::set(iov &iov,
const bool &b,
const conditional_member &cp)
:node
{
b?
&iov:
nullptr,
[&iov, &b, &cp]
{
if(!b)
return member{};
iov.remove_if([&cp](const auto &existing)
{
return string_view{existing.first} == cp.first;
});
return member
{
cp.first, cp.second()
};
}()
}
{
}
ircd::json::iov::defaults::defaults(iov &iov,
member member)
:node
{
!iov.has(member.first)?
&iov:
nullptr,
std::move(member)
}
{
}
ircd::json::iov::defaults::defaults(iov &iov,
bool b,
const conditional_member &cp)
:node
{
[&iov, &b, &cp]() -> json::iov *
{
if(!b)
return nullptr;
if(!iov.has(cp.first))
return &iov;
b = false;
return nullptr;
}(),
[&iov, &b, &cp]
{
if(!b)
return member{};
return member
{
cp.first, cp.second()
};
}()
}
{
}
///////////////////////////////////////////////////////////////////////////////
//
// json/strung.h
//
ircd::json::strung
ircd::json::insert(const strung &s,
const json::member &m)
{
if(!empty(s) && type(s) != type::OBJECT)
throw type_error
{
"Cannot insert member into JSON of type %s",
reflect(type(s))
};
size_t mctr {0};
thread_local std::array<member, iov::MAX_SIZE> mb;
for(const object::member &m : object{s})
mb.at(mctr++) = member{m};
mb.at(mctr++) = m;
return strung
{
mb.data(), mb.data() + mctr
};
}
ircd::json::strung
ircd::json::remove(const strung &s,
const string_view &key)
{
if(empty(s))
return s;
if(type(s) != type::OBJECT)
throw type_error
{
"Cannot remove object member '%s' from JSON of type %s",
key,
reflect(type(s))
};
size_t mctr {0};
thread_local std::array<object::member, iov::MAX_SIZE> mb;
for(const object::member &m : object{s})
if(m.first != key)
mb.at(mctr++) = m;
return strung
{
mb.data(), mb.data() + mctr
};
}
ircd::json::strung
ircd::json::remove(const strung &s,
const size_t &idx)
{
if(empty(s))
return s;
if(type(s) != type::ARRAY)
throw type_error
{
"Cannot remove array element [%zu] from JSON of type %s",
idx,
reflect(type(s))
};
size_t mctr{0}, i{0};
thread_local std::array<string_view, iov::MAX_SIZE> mb;
for(const string_view &m : array{s})
if(i++ != idx)
mb.at(mctr++) = m;
return strung
{
mb.data(), mb.data() + mctr
};
}
ircd::json::strung::operator
json::array()
const
{
return string_view{*this};
}
ircd::json::strung::operator
json::object()
const
{
return string_view{*this};
}
///////////////////////////////////////////////////////////////////////////////
//
// json/vector.h
//
ircd::json::vector::const_iterator &
ircd::json::vector::const_iterator::operator++()
try
{
static const parser::rule<string_view> parse_next
{
raw[parser.object(0)] | qi::eoi
,"next vector element or end"
};
string_view state;
qi::parse(start, stop, eps > parse_next, state);
this->state = state;
return *this;
}
catch(const qi::expectation_failure<const char *> &e)
{
throw expectation_failure(start, e);
}
ircd::json::vector::const_iterator
ircd::json::vector::begin()
const try
{
static const parser::rule<string_view> parse_begin
{
raw[parser.object(0)]
,"object vector element"
};
const_iterator ret
{
string_view::begin(), string_view::end()
};
if(!string_view{*this}.empty())
{
string_view state;
qi::parse(ret.start, ret.stop, eps > parse_begin, state);
ret.state = state;
}
return ret;
}
catch(const qi::expectation_failure<const char *> &e)
{
throw expectation_failure(string_view::begin(), e);
}
ircd::json::vector::const_iterator
ircd::json::vector::end()
const
{
return { string_view::end(), string_view::end() };
}
///////////////////////////////////////////////////////////////////////////////
//
// json/object.h
//
decltype(ircd::json::object::max_recursion_depth)
const ircd::json::object::max_recursion_depth
{
32
};
std::ostream &
ircd::json::operator<<(std::ostream &s, const object::member &member)
{
s << json::strung(member);
return s;
}
ircd::string_view
ircd::json::stringify(mutable_buffer &buf,
const object::member &member)
{
char *const start(begin(buf));
printer(buf, printer.name << printer.name_sep, member.first);
stringify(buf, member.second);
const string_view ret
{
start, begin(buf)
};
assert(serialized(member) == size(ret));
return ret;
}
size_t
ircd::json::serialized(const object::member &member)
{
const json::value key{member.first, json::STRING};
return serialized(key) + 1 + serialized(member.second);
}
std::ostream &
ircd::json::operator<<(std::ostream &s, const object &object)
{
s << json::strung(object);
return s;
}
ircd::string_view
ircd::json::stringify(mutable_buffer &buf,
const object &object)
try
{
using member_array = std::array<object::member, iov::MAX_SIZE>;
using member_arrays = std::array<member_array, object::max_recursion_depth>;
static_assert(sizeof(member_arrays) == 1_MiB); // yay reentrance .. joy :/
thread_local member_arrays ma;
thread_local size_t mctr;
const size_t mc{mctr++};
assert(mc < ma.size());
const unwind uw{[&mc]
{
--mctr;
assert(mctr == mc);
}};
size_t i(0);
auto &m{ma.at(mc)};
for(auto it(begin(object)); it != end(object); ++it, ++i)
m.at(i) = *it;
std::sort(begin(m), begin(m) + i, []
(const object::member &a, const object::member &b)
{
return a.first < b.first;
});
return stringify(buf, m.data(), m.data() + i);
}
catch(const std::out_of_range &e)
{
throw print_error
{
"Too many members (%zu) for stringifying JSON object",
size(object)
};
}
ircd::string_view
ircd::json::stringify(mutable_buffer &buf,
const object::member *const &b,
const object::member *const &e)
{
char *const start(begin(buf));
static const auto stringify_member
{
[](mutable_buffer &buf, const object::member &member)
{
stringify(buf, member);
}
};
printer(buf, printer.object_begin);
printer::list_protocol(buf, b, e, stringify_member);
printer(buf, printer.object_end);
const string_view ret
{
start, begin(buf)
};
assert(serialized(b, e) == size(ret));
return ret;
}
size_t
ircd::json::serialized(const object &object)
{
const auto b(begin(object));
const auto e(end(object));
assert(!empty(object) || b == e);
const size_t ret(1 + (b == e));
return std::accumulate(b, e, ret, []
(auto ret, const object::member &member)
{
return ret += serialized(member) + 1;
});
}
size_t
ircd::json::serialized(const object::member *const &begin,
const object::member *const &end)
{
const size_t ret(1 + (begin == end));
return std::accumulate(begin, end, ret, []
(auto ret, const object::member &member)
{
return ret += serialized(member) + 1;
});
}
bool
ircd::json::sorted(const object::member *const &begin,
const object::member *const &end)
{
return std::is_sorted(begin, end, []
(const object::member &a, const object::member &b)
{
return a.first < b.first;
});
}
bool
ircd::json::sorted(const object &object)
{
auto it(begin(object));
if(it == end(object))
return true;
string_view last{it->first};
for(++it; it != end(object); last = it->first, ++it)
if(it->first < last)
return false;
return true;
}
ircd::json::object::const_iterator &
ircd::json::object::const_iterator::operator++()
try
{
static const auto &ws
{
parser.ws
};
static const parser::rule<json::object::member> member
{
parser.name >> -ws >> parser.name_sep >> -ws >> raw[parser.value(0)]
,"next object member"
};
static const parser::rule<json::object::member> parse_next
{
(parser.object_end | (parser.value_sep >> -ws >> member)) >> -ws
,"next object member or end"
};
state.first = string_view{};
state.second = string_view{};
qi::parse(start, stop, eps > parse_next, state);
return *this;
}
catch(const qi::expectation_failure<const char *> &e)
{
throw expectation_failure(start, e);
}
ircd::json::object::operator std::string()
const
{
return json::strung(*this);
}
ircd::json::object::const_iterator
ircd::json::object::begin()
const try
{
static const auto &ws
{
parser.ws
};
static const parser::rule<json::object::member> object_member
{
parser.name >> -ws >> parser.name_sep >> -ws >> raw[parser.value(0)]
,"object member"
};
static const parser::rule<json::object::member> parse_begin
{
-ws >> parser.object_begin >> -ws >> (parser.object_end | object_member) >> -ws
,"object begin and member or end"
};
const_iterator ret
{
string_view::begin(), string_view::end()
};
if(!string_view{*this}.empty())
qi::parse(ret.start, ret.stop, eps > parse_begin, ret.state);
return ret;
}
catch(const qi::expectation_failure<const char *> &e)
{
throw expectation_failure(string_view::begin(), e);
}
ircd::json::object::const_iterator
ircd::json::object::end()
const
{
return { string_view::end(), string_view::end() };
}
///////////////////////////////////////////////////////////////////////////////
//
// json/array.h
//
decltype(ircd::json::array::max_recursion_depth)
ircd::json::array::max_recursion_depth
{
32
};
ircd::string_view
ircd::json::stringify(mutable_buffer &buf,
const array &v)
{
if(string_view{v}.empty())
{
const char *const start{begin(buf)};
consume(buf, copy(buf, empty_array));
const string_view ret{start, begin(buf)};
assert(serialized(v) == size(ret));
return ret;
}
return array::stringify(buf, begin(v), end(v));
}
size_t
ircd::json::serialized(const array &v)
{
assert(!empty(v) || (begin(v) == end(v)));
return array::serialized(begin(v), end(v));
}
ircd::string_view
ircd::json::stringify(mutable_buffer &buf,
const std::string *const &b,
const std::string *const &e)
{
return array::stringify(buf, b, e);
}
size_t
ircd::json::serialized(const std::string *const &b,
const std::string *const &e)
{
return array::serialized(b, e);
}
ircd::string_view
ircd::json::stringify(mutable_buffer &buf,
const string_view *const &b,
const string_view *const &e)
{
return array::stringify(buf, b, e);
}
size_t
ircd::json::serialized(const string_view *const &b,
const string_view *const &e)
{
return array::serialized(b, e);
}
template<class it>
ircd::string_view
ircd::json::array::stringify(mutable_buffer &buf,
const it &b,
const it &e)
{
static const auto print_element
{
[](mutable_buffer &buf, const string_view &element)
{
json::stringify(buf, element);
}
};
using ircd::buffer::begin;
char *const start(begin(buf));
printer(buf, printer.array_begin);
printer::list_protocol(buf, b, e, print_element);
printer(buf, printer.array_end);
const string_view ret
{
start, begin(buf)
};
using ircd::buffer::size;
assert(serialized(b, e) == size(ret));
return ret;
}
template<class it>
size_t
ircd::json::array::serialized(const it &b,
const it &e)
{
const size_t ret(1 + (b == e));
return std::accumulate(b, e, ret, []
(auto ret, const string_view &value)
{
return ret += json::serialized(value) + 1;
});
}
std::ostream &
ircd::json::operator<<(std::ostream &s, const array &a)
{
s << json::strung(a);
return s;
}
ircd::json::array::const_iterator &
ircd::json::array::const_iterator::operator++()
try
{
static const auto &ws
{
parser.ws
};
static const parser::rule<string_view> value
{
raw[parser.value(0)]
,"array element"
};
static const parser::rule<string_view> parse_next
{
(parser.array_end | (parser.value_sep >> -ws >> value)) >> -ws
,"next array element or end"
};
state = string_view{};
qi::parse(start, stop, eps > parse_next, state);
return *this;
}
catch(const qi::expectation_failure<const char *> &e)
{
throw expectation_failure(start, e);
}
ircd::json::array::operator std::string()
const
{
return json::strung(*this);
}
ircd::json::array::const_iterator
ircd::json::array::begin()
const try
{
static const auto &ws
{
parser.ws
};
static const parser::rule<string_view> value
{
raw[parser.value(0)]
,"array element"
};
static const parser::rule<string_view> parse_begin
{
-ws >> parser.array_begin >> -ws >> (parser.array_end | value) >> -ws
,"array begin and element or end"
};
const_iterator ret
{
string_view::begin(), string_view::end()
};
if(!string_view{*this}.empty())
qi::parse(ret.start, ret.stop, eps > parse_begin, ret.state);
return ret;
}
catch(const qi::expectation_failure<const char *> &e)
{
throw expectation_failure(string_view::begin(), e);
}
ircd::json::array::const_iterator
ircd::json::array::end()
const
{
return { string_view::end(), string_view::end() };
}
///////////////////////////////////////////////////////////////////////////////
//
// json/member.h
//
ircd::string_view
ircd::json::stringify(mutable_buffer &buf,
const members &list)
{
return stringify(buf, std::begin(list), std::end(list));
}
ircd::string_view
ircd::json::stringify(mutable_buffer &buf,
const member &m)
{
return stringify(buf, &m, &m + 1);
}
ircd::string_view
ircd::json::stringify(mutable_buffer &buf,
const member *const &b,
const member *const &e)
try
{
using member_array = std::array<const member *, iov::MAX_SIZE>;
using member_arrays = std::array<member_array, object::max_recursion_depth>;
static_assert(sizeof(member_arrays) == 256_KiB);
thread_local member_arrays ma;
thread_local size_t mctr;
const size_t mc{mctr++};
assert(mc < ma.size());
const unwind uw{[&mc]
{
--mctr;
assert(mctr == mc);
}};
size_t i(0);
auto &m{ma.at(mc)};
for(auto it(b); it != e; ++it)
m.at(i++) = it;
std::sort(begin(m), begin(m) + i, []
(const member *const &a, const member *const &b)
{
return *a < *b;
});
static const auto print_member
{
[](mutable_buffer &buf, const member *const &m)
{
printer(buf, printer.name << printer.name_sep, m->first);
stringify(buf, m->second);
}
};
char *const start{begin(buf)};
printer(buf, printer.object_begin);
printer::list_protocol(buf, m.data(), m.data() + i, print_member);
printer(buf, printer.object_end);
const string_view ret
{
start, begin(buf)
};
assert(serialized(b, e) == size(ret));
return ret;
}
catch(const std::out_of_range &)
{
throw print_error
{
"Too many members (%zd) for stringifying", std::distance(b, e)
};
}
size_t
ircd::json::serialized(const members &m)
{
return serialized(std::begin(m), std::end(m));
}
size_t
ircd::json::serialized(const member *const &begin,
const member *const &end)
{
const size_t ret(1 + (begin == end));
return std::accumulate(begin, end, ret, []
(auto ret, const auto &member)
{
return ret += serialized(member) + 1;
});
}
size_t
ircd::json::serialized(const member &member)
{
return serialized(member.first) + 1 + serialized(member.second);
}
bool
ircd::json::sorted(const member *const &begin,
const member *const &end)
{
return std::is_sorted(begin, end, []
(const member &a, const member &b)
{
return a < b;
});
}
///////////////////////////////////////////////////////////////////////////////
//
// json/value.h
//
const ircd::string_view ircd::json::literal_null { "null" };
const ircd::string_view ircd::json::literal_true { "true" };
const ircd::string_view ircd::json::literal_false { "false" };
const ircd::string_view ircd::json::empty_string { "\"\"" };
const ircd::string_view ircd::json::empty_object { "{}" };
const ircd::string_view ircd::json::empty_array { "[]" };
decltype(ircd::json::undefined_number)
ircd::json::undefined_number
{
std::numeric_limits<decltype(ircd::json::undefined_number)>::min()
};
static_assert
(
ircd::json::undefined_number != 0
);
std::ostream &
ircd::json::operator<<(std::ostream &s, const value &v)
{
s << json::strung(v);
return s;
}
ircd::string_view
ircd::json::stringify(mutable_buffer &buf,
const value *const &b,
const value *const &e)
{
static const auto print_value
{
[](mutable_buffer &buf, const value &value)
{
stringify(buf, value);
}
};
char *const start(begin(buf));
printer(buf, printer.array_begin);
printer::list_protocol(buf, b, e, print_value);
printer(buf, printer.array_end);
const string_view ret
{
start, begin(buf)
};
assert(serialized(b, e) == size(ret));
return ret;
}
ircd::string_view
ircd::json::stringify(mutable_buffer &buf,
const value &v)
{
const auto start
{
begin(buf)
};
switch(v.type)
{
case STRING:
{
if(!v.string)
{
consume(buf, copy(buf, empty_string));
break;
}
const string_view sv
{
v.string, v.len
};
if(v.serial)
{
consume(buf, copy(buf, sv));
break;
}
if(surrounds(sv, '"'))
printer(buf, printer.quoted, sv);
else
printer(buf, printer.unquoted, sv);
break;
}
case LITERAL:
{
if(v.serial)
printer(buf, printer.literal, string_view{v});
else if(v.integer)
consume(buf, copy(buf, "true"_sv));
else
consume(buf, copy(buf, "false"_sv));
break;
}
case OBJECT:
{
if(v.serial)
{
stringify(buf, json::object{string_view{v}});
break;
}
if(v.object)
{
stringify(buf, v.object, v.object + v.len);
break;
}
consume(buf, copy(buf, empty_object));
break;
}
case ARRAY:
{
if(v.serial)
{
stringify(buf, json::array{string_view{v}});
break;
}
if(v.array)
{
stringify(buf, v.array, v.array + v.len);
break;
}
consume(buf, copy(buf, empty_array));
break;
}
case NUMBER:
{
if(v.serial)
//printer(buf, printer.number, string_view{v});
consume(buf, copy(buf, strip(string_view{v}, ' ')));
else if(v.floats)
consume(buf, copy(buf, lex_cast(v.floating)));
else
consume(buf, copy(buf, lex_cast(v.integer)));
break;
}
}
const string_view ret
{
start, begin(buf)
};
assert(serialized(v) == size(ret));
return ret;
}
size_t
ircd::json::serialized(const values &v)
{
return serialized(std::begin(v), std::end(v));
}
size_t
ircd::json::serialized(const value *const &begin,
const value *const &end)
{
// One opening '[' and either one ']' or comma count.
const size_t ret(1 + (begin == end));
return std::accumulate(begin, end, size_t(ret), []
(auto ret, const value &v)
{
return ret += serialized(v) + 1; // 1 comma
});
}
size_t
ircd::json::serialized(const value &v)
{
switch(v.type)
{
case OBJECT: return
v.serial?
serialized(json::object{v}):
serialized(v.object, v.object + v.len);
case ARRAY: return
v.serial?
serialized(json::array{v}):
serialized(v.array, v.array + v.len);
case LITERAL: return
v.serial?
v.len:
v.integer?
size(literal_true):
size(literal_false);
case NUMBER:
{
thread_local char test_buffer[256];
mutable_buffer buf{test_buffer};
if(v.serial)
//printer(buf, printer.number, string_view{v});
return size(strip(string_view{v}, ' '));
else if(v.floats)
return size(lex_cast(v.floating));
else
return size(lex_cast(v.integer));
return begin(buf) - test_buffer;
}
case STRING:
{
if(!v.string)
return size(empty_string);
if(v.serial)
return v.len;
size_t ret(v.len);
const string_view sv{v.string, v.len};
ret += !startswith(sv, '"');
ret += !endswith(sv, '"');
return ret;
}
};
throw type_error("deciding the size of a type[%u] is undefined", int(v.type));
}
size_t
ircd::json::serialized(const bool &b)
{
constexpr const size_t t
{
strlen("true")
};
constexpr const size_t f
{
strlen("false")
};
return b? t : f;
}
bool
ircd::json::defined(const value &a)
{
return !a.undefined();
}
enum ircd::json::type
ircd::json::type(const value &a)
{
return a.type;
}
//
// value::value
//
ircd::json::value::value(const string_view &sv,
const enum type &type)
:string{sv.data()}
,len{sv.size()}
,type{type}
,serial{type == STRING? surrounds(sv, '"') : true}
,alloc{false}
,floats{false}
{}
ircd::json::value::value(const std::string &s,
const enum type &type)
:string{nullptr}
,len{0}
,type{type}
,serial{type == STRING? surrounds(s, '"') : true}
,alloc{true}
,floats{false}
{
const string_view sv{s};
create_string(serialized(sv), [&sv]
(mutable_buffer buf)
{
json::stringify(buf, sv);
});
}
ircd::json::value::value(const char *const &str,
const enum type &type)
:value{string_view{str}, type}
{}
ircd::json::value::value(const char *const &str)
:value{string_view{str}}
{}
ircd::json::value::value(const string_view &sv)
:value{sv, json::type(sv, std::nothrow)}
{}
ircd::json::value::value(const std::string &s)
:value{s, json::type(s, std::nothrow)}
{}
ircd::json::value::value(const json::object &sv)
:value{sv, OBJECT}
{}
ircd::json::value::value(const json::array &sv)
:value{sv, ARRAY}
{}
ircd::json::value::value(const nullptr_t &)
:value
{
literal_null, type::LITERAL
}{}
ircd::json::value::value(const bool &boolean)
:value
{
boolean? literal_true : literal_false, type::LITERAL
}{}
ircd::json::value::value(const struct value *const &array,
const size_t &len)
:array{array}
,len{len}
,type{ARRAY}
,serial{false}
,alloc{false}
,floats{false}
{
}
ircd::json::value::value(std::unique_ptr<const struct value[]> &&array,
const size_t &len)
:array{array.get()}
,len{len}
,type{ARRAY}
,serial{false}
,alloc{true}
,floats{false}
{
array.release();
}
ircd::json::value::value(const struct member *const &object,
const size_t &len)
:object{object}
,len{len}
,type{OBJECT}
,serial{false}
,alloc{false}
,floats{false}
{}
ircd::json::value::value(std::unique_ptr<const struct member[]> &&object,
const size_t &len)
:object{object.get()}
,len{len}
,type{OBJECT}
,serial{false}
,alloc{true}
,floats{false}
{
object.release();
}
ircd::json::value::value(const int64_t &integer)
:integer{integer}
,len{0}
,type{NUMBER}
,serial{false}
,alloc{false}
,floats{false}
{}
ircd::json::value::value(const double &floating)
:floating{floating}
,len{0}
,type{NUMBER}
,serial{false}
,alloc{false}
,floats{true}
{}
ircd::json::value::value(const json::members &members)
:string{nullptr}
,len{serialized(members)}
,type{OBJECT}
,serial{true}
,alloc{true}
,floats{false}
{
create_string(len, [&members]
(mutable_buffer &buffer)
{
json::stringify(buffer, members);
});
}
ircd::json::value::value(const value &other)
:integer{other.integer}
,len{other.len}
,type{other.type}
,serial{other.serial}
,alloc{other.alloc}
,floats{other.floats}
{
if(serial)
{
create_string(len, [&other]
(mutable_buffer &buffer)
{
json::stringify(buffer, string_view{other});
});
}
else switch(type)
{
case OBJECT:
{
if(!object)
break;
const size_t count(this->len);
create_string(serialized(object, object + count), [this, &count]
(mutable_buffer &buffer)
{
json::stringify(buffer, object, object + count);
});
break;
}
case ARRAY:
{
if(!array)
break;
const size_t count(this->len);
create_string(serialized(array, array + count), [this, &count]
(mutable_buffer &buffer)
{
json::stringify(buffer, array, array + count);
});
break;
}
case STRING:
{
if(!string)
break;
create_string(serialized(other), [&other]
(mutable_buffer &buffer)
{
json::stringify(buffer, other);
});
break;
}
case LITERAL:
case NUMBER:
break;
}
}
ircd::json::value::value(value &&other)
noexcept
:integer{other.integer}
,len{other.len}
,type{other.type}
,serial{other.serial}
,alloc{other.alloc}
,floats{other.floats}
{
other.alloc = false;
}
ircd::json::value &
ircd::json::value::operator=(value &&other)
noexcept
{
this->~value();
integer = other.integer;
len = other.len;
type = other.type;
serial = other.serial;
alloc = other.alloc;
other.alloc = false;
floats = other.floats;
return *this;
}
ircd::json::value &
ircd::json::value::operator=(const value &other)
{
this->~value();
new (this) value(other);
return *this;
}
ircd::json::value::~value()
noexcept
{
if(!alloc)
return;
else if(serial)
delete[] string;
else switch(type)
{
case STRING:
delete[] string;
break;
case OBJECT:
delete[] object;
break;
case ARRAY:
delete[] array;
break;
default:
break;
}
}
ircd::json::value::operator std::string()
const
{
return json::strung(*this);
}
ircd::json::value::operator string_view()
const
{
switch(type)
{
case STRING:
return unquote(string_view{string, len});
case NUMBER:
return serial? string_view{string, len}:
floats? byte_view<string_view>{floating}:
byte_view<string_view>{integer};
case ARRAY:
case OBJECT:
case LITERAL:
if(likely(serial))
return string_view{string, len};
else
break;
}
throw type_error
{
"value type[%d] is not a string", int(type)
};
}
ircd::json::value::operator int64_t()
const
{
switch(type)
{
case NUMBER:
return likely(!floats)? integer : floating;
case STRING:
return lex_cast<int64_t>(string_view{*this});
case ARRAY:
case OBJECT:
case LITERAL:
break;
}
throw type_error
{
"value type[%d] is not an int64_t", int(type)
};
}
ircd::json::value::operator double()
const
{
switch(type)
{
case NUMBER:
return likely(floats)? floating : integer;
case STRING:
return lex_cast<double>(string_view{*this});
case ARRAY:
case OBJECT:
case LITERAL:
break;
}
throw type_error
{
"value type[%d] is not a float", int(type)
};
}
bool
ircd::json::value::operator!()
const
{
switch(type)
{
case NUMBER:
return floats? !(floating > 0.0 || floating < 0.0):
!bool(integer);
case STRING:
return string? !len || string_view{*this} == empty_string:
true;
case OBJECT:
return serial? !len || string_view{*this} == empty_object:
object? !len:
true;
case ARRAY:
return serial? !len || (string_view{*this} == empty_array):
array? !len:
true;
case LITERAL:
if(serial)
return string == nullptr ||
string_view{*this} == literal_false ||
string_view{*this} == literal_null;
else
return !bool(integer);
};
throw type_error
{
"deciding if a type[%u] is falsy is undefined", int(type)
};
}
bool
ircd::json::value::empty()
const
{
switch(type)
{
case NUMBER:
return serial? !len:
floats? !(floating > 0.0 || floating < 0.0):
!bool(integer);
case STRING:
return !string || !len || (serial && string_view{*this} == empty_string);
case OBJECT:
return serial? !len || string_view{*this} == empty_object:
object? !len:
true;
case ARRAY:
return serial? !len || string_view{*this} == empty_array:
array? !len:
true;
case LITERAL:
return serial? !len:
false;
};
throw type_error
{
"deciding if a type[%u] is empty is undefined", int(type)
};
}
bool
ircd::json::value::null()
const
{
switch(type)
{
case NUMBER:
return floats? !(floating > 0.0 || floating < 0.0):
!bool(integer);
case STRING:
return string == nullptr ||
string_view{string, len}.null();
case OBJECT:
return serial? string == nullptr:
object? false:
true;
case ARRAY:
return serial? string == nullptr:
array? false:
true;
case LITERAL:
return serial? string == nullptr:
string? literal_null == string:
false;
};
throw type_error
{
"deciding if a type[%u] is null is undefined", int(type)
};
}
bool
ircd::json::value::undefined()
const
{
switch(type)
{
case NUMBER:
return integer == undefined_number;
case STRING:
return string_view{string, len}.undefined();
case OBJECT:
return serial? string == nullptr:
object? false:
true;
case ARRAY:
return serial? string == nullptr:
array? false:
true;
case LITERAL:
return serial? string == nullptr:
false;
};
throw type_error
{
"deciding if a type[%u] is undefined is undefined", int(type)
};
}
void
ircd::json::value::create_string(const size_t &len,
const create_string_closure &closure)
{
const size_t max
{
len + 1
};
std::unique_ptr<char[]> string
{
new char[max]
};
mutable_buffer buffer
{
string.get(), len
};
closure(buffer);
(string.get())[len] = '\0';
this->alloc = true;
this->serial = true;
this->len = len;
this->string = string.release();
}
bool
ircd::json::operator>(const value &a, const value &b)
{
if(unlikely(type(a) != STRING || type(b) != STRING))
throw type_error("cannot compare values");
return static_cast<string_view>(a) > static_cast<string_view>(b);
}
bool
ircd::json::operator<(const value &a, const value &b)
{
if(unlikely(type(a) != STRING || type(b) != STRING))
throw type_error("cannot compare values");
return static_cast<string_view>(a) < static_cast<string_view>(b);
}
bool
ircd::json::operator>=(const value &a, const value &b)
{
if(unlikely(type(a) != STRING || type(b) != STRING))
throw type_error("cannot compare values");
return static_cast<string_view>(a) >= static_cast<string_view>(b);
}
bool
ircd::json::operator<=(const value &a, const value &b)
{
if(unlikely(type(a) != STRING || type(b) != STRING))
throw type_error("cannot compare values");
return static_cast<string_view>(a) <= static_cast<string_view>(b);
}
bool
ircd::json::operator!=(const value &a, const value &b)
{
if(unlikely(type(a) != STRING || type(b) != STRING))
throw type_error("cannot compare values");
return static_cast<string_view>(a) != static_cast<string_view>(b);
}
bool
ircd::json::operator==(const value &a, const value &b)
{
if(unlikely(type(a) != STRING || type(b) != STRING))
throw type_error("cannot compare values");
return static_cast<string_view>(a) == static_cast<string_view>(b);
}
///////////////////////////////////////////////////////////////////////////////
//
// json.h
//
std::string
ircd::json::why(const string_view &s)
try
{
valid(s);
return {};
}
catch(const expectation_failure &e)
{
return e.what();
}
bool
ircd::json::valid(const string_view &s,
std::nothrow_t)
noexcept try
{
static const parser::rule<> validator
{
parser.value(0) >> eoi
};
const char *start(begin(s)), *const stop(end(s));
return qi::parse(start, stop, validator);
}
catch(...)
{
return false;
}
void
ircd::json::valid(const string_view &s)
try
{
static const parser::rule<> validator
{
eps > parser.value(0) > eoi
};
const char *start(begin(s)), *const stop(end(s));
qi::parse(start, stop, validator);
}
catch(const qi::expectation_failure<const char *> &e)
{
throw expectation_failure(begin(s), e);
}
void
ircd::json::valid_output(const string_view &sv,
const size_t &expected)
{
if(unlikely(size(sv) != expected))
throw print_error
{
"stringified:%zu != serialized:%zu: %s",
size(sv),
expected,
sv
};
if(unlikely(!valid(sv, std::nothrow))) //note: false alarm when T=json::member
throw print_error
{
"strung %zu bytes: %s: %s",
size(sv),
why(sv),
sv
};
}
ircd::string_view
ircd::json::stringify(mutable_buffer &buf,
const string_view &v)
{
if(v.empty() && defined(v))
{
const char *const start{begin(buf)};
consume(buf, copy(buf, empty_string));
const string_view ret{start, begin(buf)};
assert(serialized(v) == size(ret));
return ret;
}
const json::value value{v};
return stringify(buf, value);
}
size_t
ircd::json::serialized(const string_view &v)
{
if(v.empty() && defined(v))
return size(empty_string);
const json::value value{v};
return serialized(value);
}
enum ircd::json::type
ircd::json::type(const string_view &buf)
{
static const auto flag
{
qi::skip_flag::dont_postskip
};
enum type ret;
if(!qi::phrase_parse(begin(buf), end(buf), parser.type, parser.WS, flag, ret))
throw type_error
{
"Failed to get type from buffer"
};
return ret;
}
enum ircd::json::type
ircd::json::type(const string_view &buf,
std::nothrow_t)
{
static const auto flag
{
qi::skip_flag::dont_postskip
};
enum type ret;
if(!qi::phrase_parse(begin(buf), end(buf), parser.type, parser.WS, flag, ret))
return STRING;
return ret;
}
ircd::string_view
ircd::json::reflect(const enum type &type)
{
switch(type)
{
case NUMBER: return "NUMBER";
case OBJECT: return "OBJECT";
case ARRAY: return "ARRAY";
case LITERAL: return "LITERAL";
case STRING: return "STRING";
}
return {};
}