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construct/ircd/json.cc
Jason Volk db24cef649 ircd::json: Minor cleanup/formatting.
2017-12-24 21:54:59 -07:00

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/*
* charybdis: standing on the shoulders of giant build times
*
* Copyright (C) 2017 Charybdis Development Team
* Copyright (C) 2017 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <ircd/spirit.h>
#include <boost/fusion/include/at.hpp>
namespace ircd::json
{
namespace spirit = boost::spirit;
namespace ascii = spirit::ascii;
namespace karma = spirit::karma;
namespace qi = spirit::qi;
using spirit::unused_type;
using qi::lit;
using qi::char_;
using qi::long_;
using qi::double_;
using qi::raw;
using qi::omit;
using qi::matches;
using qi::hold;
using qi::eoi;
using qi::eps;
using qi::attr;
using qi::repeat;
using karma::lit;
using karma::char_;
using karma::long_;
using karma::double_;
using karma::bool_;
using karma::maxwidth;
using karma::eps;
using karma::attr_cast;
struct expectation_failure;
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" };
rule<> unicode
{
lit('u') >> qi::uint_parser<char, 16, 4, 4>{}
,"escaped unicode"
};
rule<> escaped
{
lit('"') | lit('\\') | lit('\b') | lit('\f') | lit('\n') | lit('\r') | lit('\t')
,"escaped"
};
rule<> escaper
{
lit('"') | lit('\\') | lit('b') | lit('f') | lit('n') | lit('r') | lit('t') | unicode
,"escaped"
};
rule<> escaper_nc
{
escaper | lit('/')
};
// string
rule<string_view> chars
{
raw[*((char_ - (escape | quote)) | (escape >> escaper_nc))]
,"characters"
};
rule<string_view> string
{
quote >> chars >> (!escape >> quote)
,"string"
};
// 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" };
rule<> number { double_ ,"number" };
// container
rule<string_view> name
{
string
,"name"
};
rule<> member
{
name >> name_sep >> value
,"member"
};
rule<> object
{
//TODO: XXX: Recursion depth check attribute
object_begin >> -(member % value_sep) >> object_end
,"object"
};
rule<> array
{
//TODO: XXX: Recursion depth check attribute
array_begin >> -(value % value_sep) >> array_end
,"array"
};
rule<> value
{
lit_false | lit_null | lit_true | object | array | number | string
,"value"
};
rule<int> type
{
(omit[object_begin] >> attr(json::OBJECT)) |
(omit[array_begin] >> attr(json::ARRAY)) |
(omit[quote] >> attr(json::STRING)) |
(omit[number >> eoi] >> attr(json::NUMBER)) |
(omit[literal >> eoi] >> attr(json::LITERAL))
,"type"
};
input()
:input::base_type{rule<>{}}
{
//TODO: Recursion seems to require these restatements
//TODO: Can they be eliminated for DRY?
member %= name >> name_sep >> value;
array %= array_begin >> -(value % value_sep) >> array_end;
object %= object_begin >> -(member % value_sep) >> object_end;
}
};
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<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> chars { *(~char_('"')) ,"characters" };
rule<string_view> string { quote << chars << quote ,"string" };
rule<string_view> number { double_ ,"number" };
rule<string_view> name { quote << +(~char_('"')) << quote ,"name" };
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 generator,
class attribute>
bool operator()(char *&out, char *const &stop, generator&& gen, attribute&& a) 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 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()(char *&out,
char *const &stop,
gen&& g,
attr&& a)
const
{
const auto throws{[&out, &stop]
{
throw print_error
{
"Failed to print attribute '%s' generator '%s' (%zd bytes in buffer)",
demangle<decltype(a)>(),
demangle<decltype(g)>(),
size_t(stop - out)
};
}};
const auto gg
{
maxwidth(size_t(stop - out))[std::forward<gen>(g)] | eps[throws]
};
return karma::generate(out, gg, std::forward<attr>(a));
}
template<class gen>
bool
ircd::json::printer::operator()(char *&out,
char *const &stop,
gen&& g)
const
{
const auto throws{[&out, &stop]
{
throw print_error
{
"Failed to print generator '%s' (%zd bytes in buffer)",
demangle<decltype(g)>(),
size_t(stop - out)
};
}};
const auto gg
{
maxwidth(size_t(stop - out))[std::forward<gen>(g)] | eps[throws]
};
return karma::generate(out, gg);
}
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);
}
}
}
///////////////////////////////////////////////////////////////////////////////
//
// iov.h
//
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 &head,
const iov &iov)
{
const member *m[iov.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;
});
return stringify(head, m, m + iov.size());
}
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;
});
}
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;
});
}
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;
}));
return it->second;
}
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_if::add_if(iov &iov,
const bool &b,
member member)
:node
{
iov, std::move(member)
}
{
if(!b)
iov.pop_front();
}
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_if::set_if(iov &iov,
const bool &b,
member member)
:node
{
iov, std::move(member)
}
{
if(!b)
iov.pop_front();
}
ircd::json::iov::defaults::defaults(iov &iov,
member member)
:node
{
iov, std::move(member)
}
{
const auto count
{
std::count_if(std::begin(iov), std::end(iov), [&member]
(const auto &existing)
{
return string_view{existing.first} == string_view{member.first};
})
};
if(count > 1)
iov.pop_front();
}
ircd::json::iov::defaults_if::defaults_if(iov &iov,
const bool &b,
member member)
:node
{
iov, std::move(member)
}
{
if(!b)
iov.pop_front();
}
///////////////////////////////////////////////////////////////////////////////
//
// json/vector.h
//
ircd::json::vector::const_iterator &
ircd::json::vector::const_iterator::operator++()
try
{
static const qi::rule<const char *, string_view> parse_next
{
raw[parser.object] | 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 qi::rule<const char *, string_view> parse_begin
{
raw[parser.object]
,"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/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 &begin,
const member *const &end)
{
const auto num(std::distance(begin, end));
const member *vec[num];
for(auto i(0); i < num; ++i)
vec[i] = begin + i;
return stringify(buf, vec, vec + num);
}
ircd::string_view
ircd::json::stringify(mutable_buffer &buf,
const member *const *const &b,
const member *const *const &e)
{
const auto print_member
{
[](mutable_buffer &buf, const auto &it)
{
const auto &m(*it);
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, b, e, print_member);
printer(buf, printer.object_end);
return { start, begin(buf) };
}
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 + !std::distance(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);
}
///////////////////////////////////////////////////////////////////////////////
//
// json/object.h
//
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, member.first);
printer(buf, printer.name_sep);
consume(buf, copy(buf, member.second));
return string_view { start, begin(buf) };
}
size_t
ircd::json::serialized(const object::member &member)
{
return serialized(member.first) + 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)
{
const auto b(std::begin(object));
const auto e(std::end(object));
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);
return { start, begin(buf) };
}
size_t
ircd::json::serialized(const object &object)
{
const auto begin(std::begin(object));
const auto end(std::end(object));
const size_t ret(1 + (begin == end));
return std::accumulate(begin, end, ret, []
(auto ret, const object::member &member)
{
return ret += serialized(member) + 1;
});
}
ircd::json::object::const_iterator &
ircd::json::object::const_iterator::operator++()
try
{
static const qi::rule<const char *, json::object::member> member
{
parser.name >> parser.name_sep >> raw[parser.value]
,"next object member"
};
static const qi::rule<const char *, json::object::member> parse_next
{
(parser.value_sep >> member) | parser.object_end
,"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 qi::rule<const char *, json::object::member> object_member
{
parser.name >> parser.name_sep >> raw[parser.value]
,"object member"
};
static const qi::rule<const char *, json::object::member> parse_begin
{
parser.object_begin >> (parser.object_end | object_member)
,"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
//
ircd::string_view
ircd::json::stringify(mutable_buffer &buf,
const array &v)
{
if(string_view{v}.empty())
{
consume(buf, copy(buf, value::empty_array));
return value::empty_array;
}
consume(buf, copy(buf, string_view{v}));
return string_view{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)
{
const size_t ret(1 + !std::distance(b, e));
return std::accumulate(b, e, ret, []
(auto ret, const auto &value)
{
return ret += serialized(string_view{value}) + 1;
});
}
size_t
ircd::json::serialized(const string_view *const &b,
const string_view *const &e)
{
const size_t ret(1 + !std::distance(b, e));
return std::accumulate(b, e, ret, []
(auto ret, const auto &value)
{
return ret += serialized(value) + 1;
});
}
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)
{
if(!consume(buf, ircd::buffer::copy(buf, element)))
throw print_error("The JSON generator ran out of space in supplied buffer");
}
};
char *const start(std::begin(buf));
printer(buf, printer.array_begin);
printer::list_protocol(buf, b, e, print_element);
printer(buf, printer.array_end);
return { start, std::begin(buf) };
}
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 qi::rule<const char *, string_view> value
{
raw[parser.value]
,"array element"
};
static const qi::rule<const char *, string_view> parse_next
{
parser.array_end | (parser.value_sep >> value)
,"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 qi::rule<const char *, string_view> value
{
raw[parser.value]
,"array element"
};
static const qi::rule<const char *, string_view> parse_begin
{
parser.array_begin >> (parser.array_end | value)
,"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/value.h
//
const ircd::string_view ircd::json::value::literal_null {"null"};
const ircd::string_view ircd::json::value::literal_true {"true"};
const ircd::string_view ircd::json::value::literal_false {"false"};
const ircd::string_view ircd::json::value::empty_string {"\"\""};
const ircd::string_view ircd::json::value::empty_number {"0"};
const ircd::string_view ircd::json::value::empty_object {"{}"};
const ircd::string_view ircd::json::value::empty_array {"[]"};
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);
return { start, begin(buf) };
}
ircd::string_view
ircd::json::stringify(mutable_buffer &buf,
const value &v)
{
const auto start
{
begin(buf)
};
switch(v.type)
{
case STRING:
{
const string_view sv{v};
printer(buf, printer.string, sv);
break;
}
case LITERAL:
{
consume(buf, copy(buf, string_view{v}));
break;
}
case OBJECT:
{
if(v.serial)
{
consume(buf, copy(buf, string_view{v}));
break;
}
if(v.object)
{
stringify(buf, v.object, v.object + v.len);
break;
}
//consume(buf, copy(buf, v.literal_null));
consume(buf, copy(buf, v.empty_object));
break;
}
case ARRAY:
{
if(v.serial)
{
consume(buf, copy(buf, string_view{v}));
break;
}
if(v.array)
{
stringify(buf, v.array, v.array + v.len);
break;
}
//consume(buf, copy(buf, v.literal_null));
consume(buf, copy(buf, v.empty_array));
break;
}
case NUMBER:
{
if(v.serial)
{
printer(buf, printer.number, string_view{v});
break;
}
if(v.floats)
printer(buf, double_, v.floating);
else
printer(buf, long_, v.integer);
break;
}
}
return { start, begin(buf) };
}
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 + !std::distance(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? v.len : serialized(v.object, v.object + v.len);
case ARRAY:
return v.serial? v.len : serialized(v.array, v.array + v.len);
case LITERAL:
{
return v.serial? v.len : serialized(bool(v.integer));
}
case NUMBER:
{
if(v.serial)
return v.len;
static thread_local char test_buffer[4096];
const auto test
{
stringify(mutable_buffer{test_buffer}, v)
};
return test.size();
}
case STRING:
{
if(!v.string)
return 2;
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));
}
//
// json::value
//
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(alloc && serial)
{
create_string(len, [this](mutable_buffer buffer)
{
copy(buffer, string_view{*this});
});
}
else switch(type)
{
case OBJECT:
if(!serial && object)
{
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(!serial && array)
{
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(!serial && alloc && string)
{
create_string(serialized(*this), [this]
(mutable_buffer buffer)
{
json::stringify(buffer, *this);
});
}
case LITERAL:
case NUMBER:
break;
}
}
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;
break;
};
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? false:
true; //TODO: XXX arr
case LITERAL:
return serial? !len:
true;
};
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;
case OBJECT:
return serial? string == nullptr:
object? false:
true;
case ARRAY:
return serial? string == nullptr:
array? array == nullptr:
true;
case LITERAL:
return serial? string == nullptr:
true;
};
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 false;
case STRING:
return string == nullptr;
case OBJECT:
return serial? string == nullptr:
object? false:
true;
case ARRAY:
return serial? string == nullptr:
array? false:
true;
case LITERAL:
return serial? string == nullptr:
true;
};
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]
};
const 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::canonize(const string_view &in)
{
std::string ret(size(in), char{});
ret.resize(size(canonize(mutable_buffer{ret}, in)));
return ret;
}
ircd::string_view
ircd::json::canonize(const mutable_buffer &out,
const string_view &in)
try
{
//TODO: XXX
assert(0);
return in;
}
catch(const qi::expectation_failure<const char *> &e)
{
throw expectation_failure(begin(in), e);
}
bool
ircd::json::valid(const string_view &s,
std::nothrow_t)
noexcept try
{
const char *start(begin(s)), *const stop(end(s));
return qi::parse(start, stop, parser.value >> eoi);
}
catch(...)
{
return false;
}
void
ircd::json::valid(const string_view &s)
try
{
const char *start(begin(s)), *const stop(end(s));
qi::parse(start, stop, eps > (parser.value >> eoi));
}
catch(const qi::expectation_failure<const char *> &e)
{
throw expectation_failure(begin(s), e);
}
ircd::string_view
ircd::json::stringify(mutable_buffer &buf,
const string_view &v)
{
if(v.empty() && defined(v))
{
consume(buf, copy(buf, value::empty_string));
return value::empty_string;
}
consume(buf, copy(buf, string_view{v}));
return string_view{v};
}
size_t
ircd::json::serialized(const string_view &s)
{
size_t ret
{
s.size()
};
switch(type(s, std::nothrow))
{
case NUMBER:
case OBJECT:
case ARRAY:
case LITERAL:
break;
case STRING:
ret += !startswith(s, '"');
ret += !endswith(s, '"');
break;
}
return ret;
}
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 {};
}
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