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✨ add contains function for JSON pointers

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This commit is contained in:
Niels Lohmann
2019-06-30 10:03:08 +02:00
parent 39011a1759
commit 258fa798f1
7 changed files with 338 additions and 23 deletions
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127
single_include/nlohmann/json.hpp
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@ -8445,6 +8445,7 @@ class json_reverse_iterator : public std::reverse_iterator<Base>
#include <algorithm> // all_of
#include <cassert> // assert
#include <cctype> // isdigit
#include <numeric> // accumulate
#include <string> // string
#include <utility> // move
@ -8815,7 +8816,7 @@ class json_pointer
// j which will be overwritten by a primitive value
for (const auto& reference_token : reference_tokens)
{
switch (result->m_type)
switch (result->type())
{
case detail::value_t::null:
{
@ -8892,14 +8893,14 @@ class json_pointer
for (const auto& reference_token : reference_tokens)
{
// convert null values to arrays or objects before continuing
if (ptr->m_type == detail::value_t::null)
if (ptr->is_null())
{
// check if reference token is a number
const bool nums =
std::all_of(reference_token.begin(), reference_token.end(),
[](const char x)
[](const unsigned char x)
{
return x >= '0' and x <= '9';
return std::isdigit(x);
});
// change value to array for numbers or "-" or to object otherwise
@ -8908,7 +8909,7 @@ class json_pointer
: detail::value_t::object;
}
switch (ptr->m_type)
switch (ptr->type())
{
case detail::value_t::object:
{
@ -8967,7 +8968,7 @@ class json_pointer
using size_type = typename BasicJsonType::size_type;
for (const auto& reference_token : reference_tokens)
{
switch (ptr->m_type)
switch (ptr->type())
{
case detail::value_t::object:
{
@ -9032,7 +9033,7 @@ class json_pointer
using size_type = typename BasicJsonType::size_type;
for (const auto& reference_token : reference_tokens)
{
switch (ptr->m_type)
switch (ptr->type())
{
case detail::value_t::object:
{
@ -9091,7 +9092,7 @@ class json_pointer
using size_type = typename BasicJsonType::size_type;
for (const auto& reference_token : reference_tokens)
{
switch (ptr->m_type)
switch (ptr->type())
{
case detail::value_t::object:
{
@ -9138,6 +9139,77 @@ class json_pointer
return *ptr;
}
/*!
@throw parse_error.106 if an array index begins with '0'
@throw parse_error.109 if an array index was not a number
*/
bool contains(const BasicJsonType* ptr) const
{
using size_type = typename BasicJsonType::size_type;
for (const auto& reference_token : reference_tokens)
{
switch (ptr->type())
{
case detail::value_t::object:
{
if (not ptr->contains(reference_token))
{
// we did not find the key in the object
return false;
}
ptr = &ptr->operator[](reference_token);
break;
}
case detail::value_t::array:
{
if (JSON_UNLIKELY(reference_token == "-"))
{
// "-" always fails the range check
return false;
}
// error condition (cf. RFC 6901, Sect. 4)
if (JSON_UNLIKELY(reference_token.size() > 1 and reference_token[0] == '0'))
{
JSON_THROW(detail::parse_error::create(106, 0,
"array index '" + reference_token +
"' must not begin with '0'"));
}
JSON_TRY
{
const auto idx = static_cast<size_type>(array_index(reference_token));
if (idx >= ptr->size())
{
// index out of range
return false;
}
ptr = &ptr->operator[](idx);
break;
}
JSON_CATCH(std::invalid_argument&)
{
JSON_THROW(detail::parse_error::create(109, 0, "array index '" + reference_token + "' is not a number"));
}
break;
}
default:
{
// we do not expect primitive values if there is still a
// reference token to process
return false;
}
}
}
// no reference token left means we found a primitive value
return true;
}
/*!
@brief split the string input to reference tokens
@ -9259,7 +9331,7 @@ class json_pointer
const BasicJsonType& value,
BasicJsonType& result)
{
switch (value.m_type)
switch (value.type())
{
case detail::value_t::array:
{
@ -16802,15 +16874,48 @@ class basic_json
@liveexample{The following code shows an example for `contains()`.,contains}
@sa @ref find(KeyT&&) -- returns an iterator to an object element
@sa @ref contains(const json_pointer&) const -- checks the existence for a JSON pointer
@since version 3.6.0
*/
template<typename KeyT>
bool contains(KeyT&& key) const
template<typename KeyT, typename std::enable_if<
not std::is_same<KeyT, json_pointer>::value, int>::type = 0>
bool contains(KeyT && key) const
{
return is_object() and m_value.object->find(std::forward<KeyT>(key)) != m_value.object->end();
}
/*!
@brief check the existence of an element in a JSON object given a JSON pointer
Check wehther the given JSON pointer @a ptr can be resolved in the current
JSON value.
@note This method can be executed on any JSON value type.
@param[in] ptr JSON pointer to check its existence.
@return true if the JSON pointer can be resolved to a stored value, false
otherwise.
@post If `j.contains(ptr)` returns true, it is safe to call `j[ptr]`.
@throw parse_error.106 if an array index begins with '0'
@throw parse_error.109 if an array index was not a number
@complexity Logarithmic in the size of the JSON object.
@liveexample{The following code shows an example for `contains()`.,contains_json_pointer}
@sa @ref contains(KeyT &&) const -- checks the existence of a key
@since version 3.7.0
*/
bool contains(const json_pointer& ptr) const
{
return ptr.contains(this);
}
/// @}