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added a flatten function

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This commit is contained in:
Niels
2016-04-16 16:39:20 +02:00
parent 3401954f5b
commit 007359675b
3 changed files with 217 additions and 52 deletions
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111
src/json.hpp.re2c
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@ -8217,32 +8217,6 @@ class basic_json
/// the reference tokens
std::vector<std::string> reference_tokens {};
/*!
@brief replace all occurrences of a substring by another string
@param[in,out] s the string to manipulate
@param[in] f the substring to replace with @a t
@param[out] t the string to replace @a f
@return The string @a s where all occurrences of @a f are replaced
with @a t.
@pre The search string @a f must not be empty.
*/
static void replace_substring(std::string& s,
const std::string& f,
const std::string& t)
{
assert(not f.empty());
for (
size_t pos = s.find(f); // find first occurrence of f
pos != std::string::npos; // make sure f was found
s.replace(pos, f.size(), t), // replace with t
pos = s.find(f, pos + t.size()) // find next occurrence of f
);
}
/// split the string input to reference tokens
void split(std::string reference_string)
{
@ -8303,7 +8277,92 @@ class basic_json
reference_tokens.push_back(reference_token);
}
}
/*!
@brief replace all occurrences of a substring by another string
@param[in,out] s the string to manipulate
@param[in] f the substring to replace with @a t
@param[out] t the string to replace @a f
@return The string @a s where all occurrences of @a f are replaced
with @a t.
@pre The search string @a f must not be empty.
@since version 2.0.0
*/
static void replace_substring(std::string& s,
const std::string& f,
const std::string& t)
{
assert(not f.empty());
for (
size_t pos = s.find(f); // find first occurrence of f
pos != std::string::npos; // make sure f was found
s.replace(pos, f.size(), t), // replace with t
pos = s.find(f, pos + t.size()) // find next occurrence of f
);
}
/*!
@param[in] reference_string the reference string to the current value
@param[in] value the value to consider
@param[in,out] result the result object to insert values to
*/
static void flatten(const std::string reference_string,
const basic_json& value,
basic_json& result)
{
switch (value.m_type)
{
case value_t::array:
{
// iterate array and use index as reference string
for (size_t i = 0; i < value.m_value.array->size(); ++i)
{
flatten(reference_string + "/" + std::to_string(i),
value.m_value.array->operator[](i), result);
}
break;
}
case value_t::object:
{
// iterate object and use keys as reference string
for (const auto& element : *value.m_value.object)
{
// escape "~"" to "~0" and "/" to "~1"
std::string key(element.first);
replace_substring(key, "~", "~0");
replace_substring(key, "/", "~1");
flatten(reference_string + "/" + key,
element.second, result);
}
break;
}
default:
{
// add primitive value with its reference string
result[reference_string] = value;
break;
}
}
}
};
/*!
@return an object that maps JSON pointers to primitve values
*/
basic_json flatten() const
{
basic_json result(value_t::object);
json_pointer::flatten("", *this, result);
return result;
}
};