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ircd::json: Add splice operations over json::strung.

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This commit is contained in:
Jason Volk 2018-09-05 19:21:59 -07:00
parent c189feb87b
commit cffe958d2b
2 changed files with 81 additions and 0 deletions
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4
include/ircd/json/strung.h
View file

@ -14,6 +14,10 @@
namespace ircd::json
{
struct strung;
strung remove(const strung &, const string_view &key);
strung remove(const strung &, const size_t &index);
strung insert(const strung &, const json::member &);
}
/// Interface around an allocated std::string of JSON. This is not a

77
ircd/json.cc
View file

@ -1209,6 +1209,83 @@ ircd::json::iov::defaults::defaults(iov &iov,
// 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