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Re-template json_pointer on string type (#3415)

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* Make exception context optional

Change exception context parameter to pointer and replace context with
nullptr where appropriate.

* Support escaping other string types

* Add string concatenation function

Add variadic concat() function for concatenating char *, char, and
string types.

* Replace string concatenations using + with concat()

* Template json_pointer on string type

Change json_pointer from being templated on basic_json to being
templated on string type.

* Add unit test for #3388

Closes #3388.

* Fix regression test for #2958

* Add backwards compatibility with json_pointer<basic_json>

* Update json_pointer docs

* Allow comparing different json_pointers

* Update version numbers
This commit is contained in:
Florian Albrechtskirchinger
2022-04-12 14:18:16 +02:00
committed by GitHub
parent 1deeb434c6
commit 616caea27a
28 changed files with 1638 additions and 784 deletions
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22
include/nlohmann/detail/string_escape.hpp
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@ -1,6 +1,5 @@
#pragma once
#include <string>
#include <nlohmann/detail/macro_scope.hpp>
namespace nlohmann
@ -21,12 +20,13 @@ enforced with an assertion.**
@since version 2.0.0
*/
inline void replace_substring(std::string& s, const std::string& f,
const std::string& t)
template<typename StringType>
inline void replace_substring(StringType& s, const StringType& f,
const StringType& t)
{
JSON_ASSERT(!f.empty());
for (auto pos = s.find(f); // find first occurrence of f
pos != std::string::npos; // make sure f was found
pos != StringType::npos; // make sure f was found
s.replace(pos, f.size(), t), // replace with t, and
pos = s.find(f, pos + t.size())) // find next occurrence of f
{}
@ -39,10 +39,11 @@ inline void replace_substring(std::string& s, const std::string& f,
*
* Note the order of escaping "~" to "~0" and "/" to "~1" is important.
*/
inline std::string escape(std::string s)
template<typename StringType>
inline StringType escape(StringType s)
{
replace_substring(s, "~", "~0");
replace_substring(s, "/", "~1");
replace_substring(s, StringType{"~"}, StringType{"~0"});
replace_substring(s, StringType{"/"}, StringType{"~1"});
return s;
}
@ -53,10 +54,11 @@ inline std::string escape(std::string s)
*
* Note the order of escaping "~1" to "/" and "~0" to "~" is important.
*/
static void unescape(std::string& s)
template<typename StringType>
static void unescape(StringType& s)
{
replace_substring(s, "~1", "/");
replace_substring(s, "~0", "~");
replace_substring(s, StringType{"~1"}, StringType{"/"});
replace_substring(s, StringType{"~0"}, StringType{"~"});
}
} // namespace detail