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Compare commits
| Author | SHA1 | Date | |
|---|---|---|---|
 Niels Lohmann
|
404427ab72 | ||
|
Niels Lohmann
|
57890cebad |
@@ -679,19 +679,29 @@ class json_pointer
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return nullptr;
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}
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// may throw parse_error.106/109 for a malformed index; an
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// index that is syntactically valid but cannot be
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// represented (out_of_range.404/410) is treated like an
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// out-of-range index below
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typename BasicJsonType::size_type idx{};
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JSON_TRY
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// tokens that array_index() rejects with parse_error.106/109
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// are passed on to it; all other tokens that it would reject
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// with out_of_range.404/410 are detected here, so that this
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// also works without exceptions
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if (JSON_HEDLEY_UNLIKELY(reference_token.size() > 1 && !(reference_token[0] >= '1' && reference_token[0] <= '9')))
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{
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idx = array_index<BasicJsonType>(reference_token);
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static_cast<void>(array_index<BasicJsonType>(reference_token)); // throws parse_error.106/109
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}
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JSON_INTERNAL_CATCH (detail::out_of_range&)
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if (JSON_HEDLEY_UNLIKELY(reference_token.empty() || !std::all_of(reference_token.begin(), reference_token.end(), [](const char c)
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{
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return c >= '0' && c <= '9';
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})))
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{
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return nullptr;
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}
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errno = 0; // strtoull() does not reset errno on success
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char* p_end = nullptr; // NOLINT(misc-const-correctness)
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const unsigned long long magnitude = std::strtoull(reference_token.data(), &p_end, 10); // NOLINT(runtime/int)
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if (JSON_HEDLEY_UNLIKELY(errno == ERANGE || magnitude >= static_cast<unsigned long long>((std::numeric_limits<typename BasicJsonType::size_type>::max)()))) // NOLINT(runtime/int)
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{
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return nullptr;
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}
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const auto idx = static_cast<typename BasicJsonType::size_type>(magnitude);
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if (JSON_HEDLEY_UNLIKELY(idx >= ptr->m_data.m_value.array->size()))
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{
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+103
-342
@@ -6106,113 +6106,68 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
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{
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// the patch
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basic_json result(value_t::array);
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diff_recursively(result, source, target, path, 0);
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// if the values are the same, return an empty patch
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if (source == target)
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{
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return result;
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}
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private:
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/// @brief two arrays or two objects @ref diff_iteratively is diffing
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struct diff_frame
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{
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diff_frame(const basic_json* source_, const basic_json* target_, const std::size_t path_length_) noexcept
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: source(source_), target(target_), path_length(path_length_)
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{}
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// declared for GCC's -Weffc++, which asks for them in a class with
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// pointer members and a non-trivial destructor; the exception
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// specifications are left implicit, as GCC 4.8 rejects explicit ones
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// that differ from them
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diff_frame(const diff_frame&) = default;
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diff_frame(diff_frame&&) = default;
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diff_frame& operator=(const diff_frame&) = default;
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diff_frame& operator=(diff_frame&&) = default;
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~diff_frame() = default;
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/// the values being diffed, both arrays or both objects
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const basic_json* source;
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const basic_json* target;
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/// the length of their path in `current_path`
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std::size_t path_length;
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/// arrays: the next index to diff
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std::size_t index = 0;
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/// objects: the next member of source to look at
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const_iterator member{}; // NOLINT(readability-redundant-member-init)
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/// objects: the keys common to both, in source's order
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std::vector<typename object_t::key_type> common_keys{}; // NOLINT(readability-redundant-member-init)
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/// objects: the next entry of common_keys
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std::size_t next_common = 0;
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/// objects: the "add" operations for keys only target has
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basic_json added_ops{}; // NOLINT(readability-redundant-member-init)
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};
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// The operations of a diff are built by the functions below rather than
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// where they are needed: building one takes several temporaries, and
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// unoptimized builds give each temporary a stack slot of its own in the
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// function it appears in. In diff_recursively, which is on the call stack
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// once per nesting level, that made every level cost kilobytes of stack.
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/// @brief append a "replace" operation for @a path with @a value to @a result
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static void diff_replace(basic_json& result, const string_t& path, const basic_json& value)
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if (source.type() != target.type())
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{
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// different types: replace value
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result.push_back(
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{
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{"op", "replace"}, {"path", path}, {"value", value}
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{"op", "replace"}, {"path", path}, {"value", target}
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});
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return result;
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}
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/// @brief append a "remove" operation for @a path to @a result
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static void diff_remove(basic_json& result, const string_t& path)
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switch (source.type())
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{
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case value_t::array:
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{
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// first pass: traverse common elements
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std::size_t i = 0;
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while (i < source.size() && i < target.size())
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{
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// recursive call to compare array values at index i
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auto temp_diff = diff(source[i], target[i], detail::concat<string_t>(path, '/', detail::to_string<string_t>(i)));
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result.insert(result.end(), temp_diff.begin(), temp_diff.end());
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++i;
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}
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// We now reached the end of at least one array
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// in a second pass, traverse the remaining elements
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// remove my remaining elements, highest index first; appending
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// in that order avoids the quadratic reinsertion done before
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for (std::size_t j = source.size(); j > i; --j)
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{
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result.push_back(object(
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{
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{"op", "remove"}, {"path", path}
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{"op", "remove"},
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{"path", detail::concat<string_t>(path, '/', detail::to_string<string_t>(j - 1))}
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}));
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}
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i = source.size();
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/// @brief append an "add" operation for @a path with @a value to @a result
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static void diff_add(basic_json& result, const string_t& path, const basic_json& value)
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// add other remaining elements
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while (i < target.size())
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{
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result.push_back(
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{
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{"op", "add"}, {"path", path}, {"value", value}
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{"op", "add"},
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{"path", detail::concat<string_t>(path, "/-")},
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{"value", target[i]}
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});
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++i;
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}
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/// @brief append the "remove" operations for the elements of array
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/// @a source from @a index on, and the "add" operations for the
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/// elements of array @a target from source's size on, to @a result
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static void diff_array_tails(basic_json& result, const basic_json& source, const basic_json& target,
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const string_t& path, const std::size_t index)
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{
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// remove my remaining elements, highest index first; appending
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// in that order avoids the quadratic reinsertion done before
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for (std::size_t j = source.size(); j > index; --j)
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{
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diff_remove(result, detail::concat<string_t>(path, '/', detail::to_string<string_t>(j - 1)));
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break;
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}
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// add other remaining elements
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for (std::size_t i = source.size(); i < target.size(); ++i)
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{
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diff_add(result, detail::concat<string_t>(path, "/-"), target[i]);
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}
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}
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/*!
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@brief compare the keys of objects @a source and @a target
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If object_t does not keep its members in insertion order, or if the keys
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both objects have are in the same order in both, and the keys only
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@a target has come after them, stores the keys common to both in
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source's order in @a common_keys, stores the "add" operations for the keys
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only @a target has in @a added_ops, and returns true: the caller then diffs
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the objects member by member. Otherwise, appends operations that remove
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every member of @a source and add every member of @a target to @a result,
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and returns false.
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*/
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static bool diff_object_keys(basic_json& result, const basic_json& source, const basic_json& target,
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const string_t& path, std::vector<typename object_t::key_type>& common_keys,
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basic_json& added_ops)
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case value_t::object:
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{
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// first pass: record, for every source key, whether it is
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// common to both objects (in source's iteration order) or
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@@ -6220,10 +6175,10 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
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// a by-product of the target.find() call already needed to
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// tell the two cases apart, so it adds no extra lookups. The
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// "remove" ops themselves are emitted later, interleaved
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// with the per-key diffs in the caller's fast path, to match
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// source's original iteration order (as the original,
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// pre-reordering-aware implementation did) instead of
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// grouping all removes before all per-key diffs.
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// with the recursive per-key diffs in the fast path below,
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// to match source's original iteration order (as the
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// original, pre-reordering-aware implementation did) instead
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// of grouping all removes before all recursive diffs.
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std::vector<typename object_t::key_type> common_keys_source_order;
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for (auto it = source.cbegin(); it != source.cend(); ++it)
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{
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@@ -6239,17 +6194,18 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
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// source.find() call already needed to detect added keys. At
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// the same time, determine whether every added key comes
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// after every common key in target's order (a precondition
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// for the fast path, which only ever appends new keys
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// for the fast path below, which only ever appends new keys
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// at the very end). Both are only needed for an object_t that
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// keeps its members in insertion order, such as the one
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// backing `ordered_json`; for any other object_t, the fast
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// path is always taken and they are not computed.
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// The patch ops for keys that were added (i.e., in target but not
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// in source) are built here so the fast path can reuse
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// patch ops for keys that were added (i.e., in target but not
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// in source); built here so the fast path below can reuse
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// them without a second source.find() per target key. Only
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// used by the fast path -- the slow (reordering) path
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// rebuilds "add" ops for every key itself.
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std::vector<typename object_t::key_type> common_keys_target_order;
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basic_json added_ops(value_t::array);
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bool new_keys_form_suffix = true;
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bool seen_new_key = false;
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for (auto it = target.cbegin(); it != target.cend(); ++it)
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@@ -6257,7 +6213,12 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
|
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if (source.find(it.key()) == source.end())
|
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{
|
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seen_new_key = true;
|
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diff_add(added_ops, detail::concat<string_t>(path, '/', detail::escape(it.key())), it.value());
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const auto path_key = detail::concat<string_t>(path, '/', detail::escape(it.key()));
|
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added_ops.push_back(
|
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{
|
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{"op", "add"}, {"path", path_key},
|
||||
{"value", it.value()}
|
||||
});
|
||||
}
|
||||
else
|
||||
{
|
||||
@@ -6290,12 +6251,43 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
|
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{
|
||||
// fast path: order of common keys already matches (or the
|
||||
// object_t's iteration order does not depend on
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||||
// insertion history), so a plain per-key diff is correct
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||||
// and minimal, as before
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common_keys = std::move(common_keys_source_order);
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return true;
|
||||
// insertion history), so a plain per-key recursive diff
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||||
// is correct and minimal, as before. common_keys_source_order
|
||||
// is, by construction, the subsequence of source's keys
|
||||
// that are common to both objects, in source's iteration
|
||||
// order -- so it can be walked in lockstep with `source`
|
||||
// using a cheap key comparison instead of another lookup.
|
||||
// Deleted keys (those source keys not in common_keys_source_order)
|
||||
// are interleaved here too, in source's original order, to
|
||||
// match the historical (pre-reordering-aware) output order.
|
||||
auto common_it = common_keys_source_order.cbegin();
|
||||
for (auto it = source.cbegin(); it != source.cend(); ++it)
|
||||
{
|
||||
if (common_it != common_keys_source_order.cend() && it.key() == *common_it)
|
||||
{
|
||||
const auto path_key = detail::concat<string_t>(path, '/', detail::escape(it.key()));
|
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auto temp_diff = diff(it.value(), target[it.key()], path_key);
|
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result.insert(result.end(), temp_diff.begin(), temp_diff.end());
|
||||
++common_it;
|
||||
}
|
||||
else
|
||||
{
|
||||
// found a key that is not in target -> remove it
|
||||
const auto path_key = detail::concat<string_t>(path, '/', detail::escape(it.key()));
|
||||
result.push_back(object(
|
||||
{
|
||||
{"op", "remove"}, {"path", path_key}
|
||||
}));
|
||||
}
|
||||
}
|
||||
|
||||
// append the "add" ops for brand-new keys collected above
|
||||
// during the pass over target -- no second source.find()
|
||||
// per target key needed
|
||||
result.insert(result.end(), added_ops.begin(), added_ops.end());
|
||||
}
|
||||
else
|
||||
{
|
||||
// slow path: the common keys are in a different relative
|
||||
// order in source and target (only possible for a
|
||||
// reorderable object_t like ordered_map). Building a
|
||||
@@ -6312,7 +6304,11 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
|
||||
// it moves it to the end, fixing its position.
|
||||
for (auto it = source.cbegin(); it != source.cend(); ++it)
|
||||
{
|
||||
diff_remove(result, detail::concat<string_t>(path, '/', detail::escape(it.key())));
|
||||
const auto path_key = detail::concat<string_t>(path, '/', detail::escape(it.key()));
|
||||
result.push_back(object(
|
||||
{
|
||||
{"op", "remove"}, {"path", path_key}
|
||||
}));
|
||||
}
|
||||
|
||||
// add every key that is either common (just removed
|
||||
@@ -6321,96 +6317,15 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
|
||||
// target exactly
|
||||
for (auto it = target.cbegin(); it != target.cend(); ++it)
|
||||
{
|
||||
diff_add(result, detail::concat<string_t>(path, '/', detail::escape(it.key())), it.value());
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
/*!
|
||||
@brief @ref diff, for values at nesting level @a depth, appending the
|
||||
operations to @a result
|
||||
|
||||
Diffing two arrays or objects calls this function again, once per nesting
|
||||
level, so values nested deeply enough used to exhaust the call stack and
|
||||
terminate the process. The descent is bounded here: once @ref
|
||||
detail::recursion_depth_limit levels have been entered, @ref
|
||||
diff_iteratively diffs what is left without the call stack.
|
||||
*/
|
||||
static void diff_recursively(basic_json& result, const basic_json& source, const basic_json& target,
|
||||
const string_t& path, const std::size_t depth)
|
||||
const auto path_key = detail::concat<string_t>(path, '/', detail::escape(it.key()));
|
||||
result.push_back(
|
||||
{
|
||||
// if the values are the same, there is nothing to do
|
||||
if (source == target)
|
||||
{
|
||||
return;
|
||||
}
|
||||
|
||||
if (JSON_HEDLEY_UNLIKELY(depth >= detail::recursion_depth_limit()))
|
||||
{
|
||||
diff_iteratively(result, source, target, path);
|
||||
return;
|
||||
}
|
||||
|
||||
if (source.type() != target.type())
|
||||
{
|
||||
// different types: replace value
|
||||
diff_replace(result, path, target);
|
||||
return;
|
||||
}
|
||||
|
||||
switch (source.type())
|
||||
{
|
||||
case value_t::array:
|
||||
{
|
||||
// first pass: traverse common elements
|
||||
std::size_t i = 0;
|
||||
while (i < source.size() && i < target.size())
|
||||
{
|
||||
// recursive call to compare array values at index i
|
||||
diff_recursively(result, source[i], target[i], detail::concat<string_t>(path, '/', detail::to_string<string_t>(i)), depth + 1);
|
||||
++i;
|
||||
}
|
||||
|
||||
// We now reached the end of at least one array
|
||||
// in a second pass, traverse the remaining elements
|
||||
diff_array_tails(result, source, target, path, i);
|
||||
break;
|
||||
}
|
||||
|
||||
case value_t::object:
|
||||
{
|
||||
std::vector<typename object_t::key_type> common_keys;
|
||||
basic_json added_ops(value_t::array);
|
||||
if (diff_object_keys(result, source, target, path, common_keys, added_ops))
|
||||
{
|
||||
// fast path: common_keys is, by construction, the
|
||||
// subsequence of source's keys that are common to both
|
||||
// objects, in source's iteration order -- so it can be
|
||||
// walked in lockstep with `source` using a cheap key
|
||||
// comparison instead of another lookup. Deleted keys
|
||||
// (those source keys not in common_keys) are interleaved
|
||||
// here too, in source's original order, to match the
|
||||
// historical (pre-reordering-aware) output order.
|
||||
auto common_it = common_keys.cbegin();
|
||||
for (auto it = source.cbegin(); it != source.cend(); ++it)
|
||||
{
|
||||
if (common_it != common_keys.cend() && it.key() == *common_it)
|
||||
{
|
||||
diff_recursively(result, it.value(), target[it.key()], detail::concat<string_t>(path, '/', detail::escape(it.key())), depth + 1);
|
||||
++common_it;
|
||||
}
|
||||
else
|
||||
{
|
||||
// found a key that is not in target -> remove it
|
||||
diff_remove(result, detail::concat<string_t>(path, '/', detail::escape(it.key())));
|
||||
{"op", "add"}, {"path", path_key},
|
||||
{"value", it.value()}
|
||||
});
|
||||
}
|
||||
}
|
||||
|
||||
// append the "add" ops for brand-new keys collected by
|
||||
// diff_object_keys -- no second source.find() per target
|
||||
// key needed
|
||||
result.insert(result.end(), added_ops.begin(), added_ops.end());
|
||||
}
|
||||
break;
|
||||
}
|
||||
|
||||
@@ -6425,170 +6340,16 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
|
||||
default:
|
||||
{
|
||||
// both primitive types: replace value
|
||||
diff_replace(result, path, target);
|
||||
result.push_back(
|
||||
{
|
||||
{"op", "replace"}, {"path", path}, {"value", target}
|
||||
});
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/*!
|
||||
@brief @ref diff without the call stack, appending the operations to
|
||||
@a result
|
||||
|
||||
Produces the same operations as @ref diff_recursively. Only reached for
|
||||
values nested more deeply than @ref detail::recursion_depth_limit.
|
||||
*/
|
||||
static void diff_iteratively(basic_json& result, const basic_json& source, const basic_json& target,
|
||||
const string_t& path)
|
||||
{
|
||||
// The arrays and objects being diffed are kept on an explicit stack,
|
||||
// and every pair of elements is still diffed completely before the
|
||||
// next one, so the operations come out in the same order as in
|
||||
// diff_recursively. The path of the values being diffed is kept in
|
||||
// one buffer that grows and shrinks with the stack, rather than in a
|
||||
// new string per level.
|
||||
std::vector<diff_frame> stack;
|
||||
string_t current_path = path;
|
||||
|
||||
// diff `s` against `t`, whose path is current_path: primitives,
|
||||
// values of different types, and objects whose members were reordered
|
||||
// are handled right away; arrays and other objects get a frame
|
||||
const auto enter = [&result, &stack, ¤t_path](const basic_json & s, const basic_json & t)
|
||||
{
|
||||
// if the values are the same, there is nothing to do. Arrays and
|
||||
// objects are not compared up front: comparing them visits
|
||||
// everything below them, so doing that at every level would take
|
||||
// quadratic time in the nesting depth - equal ones yield no
|
||||
// operations anyway.
|
||||
if ((!s.is_structured() || !t.is_structured()) && s == t)
|
||||
{
|
||||
return;
|
||||
return result;
|
||||
}
|
||||
|
||||
if (s.type() != t.type())
|
||||
{
|
||||
// different types: replace value
|
||||
diff_replace(result, current_path, t);
|
||||
return;
|
||||
}
|
||||
|
||||
switch (s.type())
|
||||
{
|
||||
case value_t::array:
|
||||
{
|
||||
stack.emplace_back(&s, &t, current_path.size());
|
||||
return;
|
||||
}
|
||||
|
||||
case value_t::object:
|
||||
{
|
||||
std::vector<typename object_t::key_type> common_keys;
|
||||
basic_json added_ops(value_t::array);
|
||||
if (diff_object_keys(result, s, t, current_path, common_keys, added_ops))
|
||||
{
|
||||
// fast path: the frame walks source in lockstep with
|
||||
// common_keys, as diff_recursively does, and appends
|
||||
// added_ops once all members are done
|
||||
stack.emplace_back(&s, &t, current_path.size());
|
||||
stack.back().member = s.cbegin();
|
||||
stack.back().common_keys = std::move(common_keys);
|
||||
stack.back().added_ops = std::move(added_ops);
|
||||
}
|
||||
return;
|
||||
}
|
||||
|
||||
case value_t::null:
|
||||
case value_t::string:
|
||||
case value_t::boolean:
|
||||
case value_t::number_integer:
|
||||
case value_t::number_unsigned:
|
||||
case value_t::number_float:
|
||||
case value_t::binary:
|
||||
case value_t::discarded:
|
||||
default:
|
||||
{
|
||||
// both primitive types: replace value
|
||||
diff_replace(result, current_path, t);
|
||||
return;
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
enter(source, target);
|
||||
while (!stack.empty())
|
||||
{
|
||||
// the frame is copied out member by member and changed through
|
||||
// stack.back(): enter() may push a frame and the end of the loop
|
||||
// pops it, either of which would invalidate a reference to it
|
||||
const basic_json* const s = stack.back().source;
|
||||
const basic_json* const t = stack.back().target;
|
||||
const std::size_t path_length = stack.back().path_length;
|
||||
const std::size_t depth = stack.size();
|
||||
|
||||
if (s->is_array())
|
||||
{
|
||||
const auto& source_array = *s->m_data.m_value.array;
|
||||
const auto& target_array = *t->m_data.m_value.array;
|
||||
|
||||
// first pass: traverse common elements
|
||||
const std::size_t i = stack.back().index;
|
||||
if (i < source_array.size() && i < target_array.size())
|
||||
{
|
||||
++stack.back().index;
|
||||
detail::concat_into(current_path, '/', detail::to_string<string_t>(i));
|
||||
enter(source_array[i], target_array[i]);
|
||||
if (stack.size() == depth)
|
||||
{
|
||||
current_path.resize(path_length);
|
||||
}
|
||||
continue;
|
||||
}
|
||||
|
||||
// We now reached the end of at least one array
|
||||
// in a second pass, traverse the remaining elements
|
||||
diff_array_tails(result, *s, *t, current_path, i);
|
||||
}
|
||||
else
|
||||
{
|
||||
const const_iterator it = stack.back().member;
|
||||
if (it != s->cend())
|
||||
{
|
||||
++stack.back().member;
|
||||
const std::size_t next_common = stack.back().next_common;
|
||||
if (next_common < stack.back().common_keys.size() && it.key() == stack.back().common_keys[next_common])
|
||||
{
|
||||
++stack.back().next_common;
|
||||
const basic_json& target_value = (*t)[it.key()];
|
||||
detail::concat_into(current_path, '/', detail::escape(it.key()));
|
||||
enter(it.value(), target_value);
|
||||
if (stack.size() == depth)
|
||||
{
|
||||
current_path.resize(path_length);
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
// found a key that is not in target -> remove it
|
||||
diff_remove(result, detail::concat<string_t>(current_path, '/', detail::escape(it.key())));
|
||||
}
|
||||
continue;
|
||||
}
|
||||
|
||||
// append the "add" ops for brand-new keys collected when the
|
||||
// object was entered
|
||||
result.insert(result.end(), stack.back().added_ops.begin(), stack.back().added_ops.end());
|
||||
}
|
||||
|
||||
// this array or object is done: continue with the one it is in
|
||||
stack.pop_back();
|
||||
if (!stack.empty())
|
||||
{
|
||||
current_path.resize(stack.back().path_length);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
public:
|
||||
/// @}
|
||||
|
||||
////////////////////////////////
|
||||
|
||||
+121
-350
@@ -20291,19 +20291,29 @@ class json_pointer
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
// may throw parse_error.106/109 for a malformed index; an
|
||||
// index that is syntactically valid but cannot be
|
||||
// represented (out_of_range.404/410) is treated like an
|
||||
// out-of-range index below
|
||||
typename BasicJsonType::size_type idx{};
|
||||
JSON_TRY
|
||||
// tokens that array_index() rejects with parse_error.106/109
|
||||
// are passed on to it; all other tokens that it would reject
|
||||
// with out_of_range.404/410 are detected here, so that this
|
||||
// also works without exceptions
|
||||
if (JSON_HEDLEY_UNLIKELY(reference_token.size() > 1 && !(reference_token[0] >= '1' && reference_token[0] <= '9')))
|
||||
{
|
||||
idx = array_index<BasicJsonType>(reference_token);
|
||||
static_cast<void>(array_index<BasicJsonType>(reference_token)); // throws parse_error.106/109
|
||||
}
|
||||
JSON_INTERNAL_CATCH (detail::out_of_range&)
|
||||
if (JSON_HEDLEY_UNLIKELY(reference_token.empty() || !std::all_of(reference_token.begin(), reference_token.end(), [](const char c)
|
||||
{
|
||||
return c >= '0' && c <= '9';
|
||||
})))
|
||||
{
|
||||
return nullptr;
|
||||
}
|
||||
errno = 0; // strtoull() does not reset errno on success
|
||||
char* p_end = nullptr; // NOLINT(misc-const-correctness)
|
||||
const unsigned long long magnitude = std::strtoull(reference_token.data(), &p_end, 10); // NOLINT(runtime/int)
|
||||
if (JSON_HEDLEY_UNLIKELY(errno == ERANGE || magnitude >= static_cast<unsigned long long>((std::numeric_limits<typename BasicJsonType::size_type>::max)()))) // NOLINT(runtime/int)
|
||||
{
|
||||
return nullptr;
|
||||
}
|
||||
const auto idx = static_cast<typename BasicJsonType::size_type>(magnitude);
|
||||
|
||||
if (JSON_HEDLEY_UNLIKELY(idx >= ptr->m_data.m_value.array->size()))
|
||||
{
|
||||
@@ -33033,113 +33043,68 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
|
||||
{
|
||||
// the patch
|
||||
basic_json result(value_t::array);
|
||||
diff_recursively(result, source, target, path, 0);
|
||||
|
||||
// if the values are the same, return an empty patch
|
||||
if (source == target)
|
||||
{
|
||||
return result;
|
||||
}
|
||||
|
||||
private:
|
||||
/// @brief two arrays or two objects @ref diff_iteratively is diffing
|
||||
struct diff_frame
|
||||
{
|
||||
diff_frame(const basic_json* source_, const basic_json* target_, const std::size_t path_length_) noexcept
|
||||
: source(source_), target(target_), path_length(path_length_)
|
||||
{}
|
||||
|
||||
// declared for GCC's -Weffc++, which asks for them in a class with
|
||||
// pointer members and a non-trivial destructor; the exception
|
||||
// specifications are left implicit, as GCC 4.8 rejects explicit ones
|
||||
// that differ from them
|
||||
diff_frame(const diff_frame&) = default;
|
||||
diff_frame(diff_frame&&) = default;
|
||||
diff_frame& operator=(const diff_frame&) = default;
|
||||
diff_frame& operator=(diff_frame&&) = default;
|
||||
~diff_frame() = default;
|
||||
|
||||
/// the values being diffed, both arrays or both objects
|
||||
const basic_json* source;
|
||||
const basic_json* target;
|
||||
/// the length of their path in `current_path`
|
||||
std::size_t path_length;
|
||||
/// arrays: the next index to diff
|
||||
std::size_t index = 0;
|
||||
/// objects: the next member of source to look at
|
||||
const_iterator member{}; // NOLINT(readability-redundant-member-init)
|
||||
/// objects: the keys common to both, in source's order
|
||||
std::vector<typename object_t::key_type> common_keys{}; // NOLINT(readability-redundant-member-init)
|
||||
/// objects: the next entry of common_keys
|
||||
std::size_t next_common = 0;
|
||||
/// objects: the "add" operations for keys only target has
|
||||
basic_json added_ops{}; // NOLINT(readability-redundant-member-init)
|
||||
};
|
||||
|
||||
// The operations of a diff are built by the functions below rather than
|
||||
// where they are needed: building one takes several temporaries, and
|
||||
// unoptimized builds give each temporary a stack slot of its own in the
|
||||
// function it appears in. In diff_recursively, which is on the call stack
|
||||
// once per nesting level, that made every level cost kilobytes of stack.
|
||||
|
||||
/// @brief append a "replace" operation for @a path with @a value to @a result
|
||||
static void diff_replace(basic_json& result, const string_t& path, const basic_json& value)
|
||||
if (source.type() != target.type())
|
||||
{
|
||||
// different types: replace value
|
||||
result.push_back(
|
||||
{
|
||||
{"op", "replace"}, {"path", path}, {"value", value}
|
||||
{"op", "replace"}, {"path", path}, {"value", target}
|
||||
});
|
||||
return result;
|
||||
}
|
||||
|
||||
/// @brief append a "remove" operation for @a path to @a result
|
||||
static void diff_remove(basic_json& result, const string_t& path)
|
||||
switch (source.type())
|
||||
{
|
||||
case value_t::array:
|
||||
{
|
||||
// first pass: traverse common elements
|
||||
std::size_t i = 0;
|
||||
while (i < source.size() && i < target.size())
|
||||
{
|
||||
// recursive call to compare array values at index i
|
||||
auto temp_diff = diff(source[i], target[i], detail::concat<string_t>(path, '/', detail::to_string<string_t>(i)));
|
||||
result.insert(result.end(), temp_diff.begin(), temp_diff.end());
|
||||
++i;
|
||||
}
|
||||
|
||||
// We now reached the end of at least one array
|
||||
// in a second pass, traverse the remaining elements
|
||||
|
||||
// remove my remaining elements, highest index first; appending
|
||||
// in that order avoids the quadratic reinsertion done before
|
||||
for (std::size_t j = source.size(); j > i; --j)
|
||||
{
|
||||
result.push_back(object(
|
||||
{
|
||||
{"op", "remove"}, {"path", path}
|
||||
{"op", "remove"},
|
||||
{"path", detail::concat<string_t>(path, '/', detail::to_string<string_t>(j - 1))}
|
||||
}));
|
||||
}
|
||||
i = source.size();
|
||||
|
||||
/// @brief append an "add" operation for @a path with @a value to @a result
|
||||
static void diff_add(basic_json& result, const string_t& path, const basic_json& value)
|
||||
// add other remaining elements
|
||||
while (i < target.size())
|
||||
{
|
||||
result.push_back(
|
||||
{
|
||||
{"op", "add"}, {"path", path}, {"value", value}
|
||||
{"op", "add"},
|
||||
{"path", detail::concat<string_t>(path, "/-")},
|
||||
{"value", target[i]}
|
||||
});
|
||||
++i;
|
||||
}
|
||||
|
||||
/// @brief append the "remove" operations for the elements of array
|
||||
/// @a source from @a index on, and the "add" operations for the
|
||||
/// elements of array @a target from source's size on, to @a result
|
||||
static void diff_array_tails(basic_json& result, const basic_json& source, const basic_json& target,
|
||||
const string_t& path, const std::size_t index)
|
||||
{
|
||||
// remove my remaining elements, highest index first; appending
|
||||
// in that order avoids the quadratic reinsertion done before
|
||||
for (std::size_t j = source.size(); j > index; --j)
|
||||
{
|
||||
diff_remove(result, detail::concat<string_t>(path, '/', detail::to_string<string_t>(j - 1)));
|
||||
break;
|
||||
}
|
||||
|
||||
// add other remaining elements
|
||||
for (std::size_t i = source.size(); i < target.size(); ++i)
|
||||
{
|
||||
diff_add(result, detail::concat<string_t>(path, "/-"), target[i]);
|
||||
}
|
||||
}
|
||||
|
||||
/*!
|
||||
@brief compare the keys of objects @a source and @a target
|
||||
|
||||
If object_t does not keep its members in insertion order, or if the keys
|
||||
both objects have are in the same order in both, and the keys only
|
||||
@a target has come after them, stores the keys common to both in
|
||||
source's order in @a common_keys, stores the "add" operations for the keys
|
||||
only @a target has in @a added_ops, and returns true: the caller then diffs
|
||||
the objects member by member. Otherwise, appends operations that remove
|
||||
every member of @a source and add every member of @a target to @a result,
|
||||
and returns false.
|
||||
*/
|
||||
static bool diff_object_keys(basic_json& result, const basic_json& source, const basic_json& target,
|
||||
const string_t& path, std::vector<typename object_t::key_type>& common_keys,
|
||||
basic_json& added_ops)
|
||||
case value_t::object:
|
||||
{
|
||||
// first pass: record, for every source key, whether it is
|
||||
// common to both objects (in source's iteration order) or
|
||||
@@ -33147,10 +33112,10 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
|
||||
// a by-product of the target.find() call already needed to
|
||||
// tell the two cases apart, so it adds no extra lookups. The
|
||||
// "remove" ops themselves are emitted later, interleaved
|
||||
// with the per-key diffs in the caller's fast path, to match
|
||||
// source's original iteration order (as the original,
|
||||
// pre-reordering-aware implementation did) instead of
|
||||
// grouping all removes before all per-key diffs.
|
||||
// with the recursive per-key diffs in the fast path below,
|
||||
// to match source's original iteration order (as the
|
||||
// original, pre-reordering-aware implementation did) instead
|
||||
// of grouping all removes before all recursive diffs.
|
||||
std::vector<typename object_t::key_type> common_keys_source_order;
|
||||
for (auto it = source.cbegin(); it != source.cend(); ++it)
|
||||
{
|
||||
@@ -33166,17 +33131,18 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
|
||||
// source.find() call already needed to detect added keys. At
|
||||
// the same time, determine whether every added key comes
|
||||
// after every common key in target's order (a precondition
|
||||
// for the fast path, which only ever appends new keys
|
||||
// for the fast path below, which only ever appends new keys
|
||||
// at the very end). Both are only needed for an object_t that
|
||||
// keeps its members in insertion order, such as the one
|
||||
// backing `ordered_json`; for any other object_t, the fast
|
||||
// path is always taken and they are not computed.
|
||||
// The patch ops for keys that were added (i.e., in target but not
|
||||
// in source) are built here so the fast path can reuse
|
||||
// patch ops for keys that were added (i.e., in target but not
|
||||
// in source); built here so the fast path below can reuse
|
||||
// them without a second source.find() per target key. Only
|
||||
// used by the fast path -- the slow (reordering) path
|
||||
// rebuilds "add" ops for every key itself.
|
||||
std::vector<typename object_t::key_type> common_keys_target_order;
|
||||
basic_json added_ops(value_t::array);
|
||||
bool new_keys_form_suffix = true;
|
||||
bool seen_new_key = false;
|
||||
for (auto it = target.cbegin(); it != target.cend(); ++it)
|
||||
@@ -33184,7 +33150,12 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
|
||||
if (source.find(it.key()) == source.end())
|
||||
{
|
||||
seen_new_key = true;
|
||||
diff_add(added_ops, detail::concat<string_t>(path, '/', detail::escape(it.key())), it.value());
|
||||
const auto path_key = detail::concat<string_t>(path, '/', detail::escape(it.key()));
|
||||
added_ops.push_back(
|
||||
{
|
||||
{"op", "add"}, {"path", path_key},
|
||||
{"value", it.value()}
|
||||
});
|
||||
}
|
||||
else
|
||||
{
|
||||
@@ -33217,12 +33188,43 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
|
||||
{
|
||||
// fast path: order of common keys already matches (or the
|
||||
// object_t's iteration order does not depend on
|
||||
// insertion history), so a plain per-key diff is correct
|
||||
// and minimal, as before
|
||||
common_keys = std::move(common_keys_source_order);
|
||||
return true;
|
||||
// insertion history), so a plain per-key recursive diff
|
||||
// is correct and minimal, as before. common_keys_source_order
|
||||
// is, by construction, the subsequence of source's keys
|
||||
// that are common to both objects, in source's iteration
|
||||
// order -- so it can be walked in lockstep with `source`
|
||||
// using a cheap key comparison instead of another lookup.
|
||||
// Deleted keys (those source keys not in common_keys_source_order)
|
||||
// are interleaved here too, in source's original order, to
|
||||
// match the historical (pre-reordering-aware) output order.
|
||||
auto common_it = common_keys_source_order.cbegin();
|
||||
for (auto it = source.cbegin(); it != source.cend(); ++it)
|
||||
{
|
||||
if (common_it != common_keys_source_order.cend() && it.key() == *common_it)
|
||||
{
|
||||
const auto path_key = detail::concat<string_t>(path, '/', detail::escape(it.key()));
|
||||
auto temp_diff = diff(it.value(), target[it.key()], path_key);
|
||||
result.insert(result.end(), temp_diff.begin(), temp_diff.end());
|
||||
++common_it;
|
||||
}
|
||||
else
|
||||
{
|
||||
// found a key that is not in target -> remove it
|
||||
const auto path_key = detail::concat<string_t>(path, '/', detail::escape(it.key()));
|
||||
result.push_back(object(
|
||||
{
|
||||
{"op", "remove"}, {"path", path_key}
|
||||
}));
|
||||
}
|
||||
}
|
||||
|
||||
// append the "add" ops for brand-new keys collected above
|
||||
// during the pass over target -- no second source.find()
|
||||
// per target key needed
|
||||
result.insert(result.end(), added_ops.begin(), added_ops.end());
|
||||
}
|
||||
else
|
||||
{
|
||||
// slow path: the common keys are in a different relative
|
||||
// order in source and target (only possible for a
|
||||
// reorderable object_t like ordered_map). Building a
|
||||
@@ -33239,7 +33241,11 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
|
||||
// it moves it to the end, fixing its position.
|
||||
for (auto it = source.cbegin(); it != source.cend(); ++it)
|
||||
{
|
||||
diff_remove(result, detail::concat<string_t>(path, '/', detail::escape(it.key())));
|
||||
const auto path_key = detail::concat<string_t>(path, '/', detail::escape(it.key()));
|
||||
result.push_back(object(
|
||||
{
|
||||
{"op", "remove"}, {"path", path_key}
|
||||
}));
|
||||
}
|
||||
|
||||
// add every key that is either common (just removed
|
||||
@@ -33248,96 +33254,15 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
|
||||
// target exactly
|
||||
for (auto it = target.cbegin(); it != target.cend(); ++it)
|
||||
{
|
||||
diff_add(result, detail::concat<string_t>(path, '/', detail::escape(it.key())), it.value());
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
/*!
|
||||
@brief @ref diff, for values at nesting level @a depth, appending the
|
||||
operations to @a result
|
||||
|
||||
Diffing two arrays or objects calls this function again, once per nesting
|
||||
level, so values nested deeply enough used to exhaust the call stack and
|
||||
terminate the process. The descent is bounded here: once @ref
|
||||
detail::recursion_depth_limit levels have been entered, @ref
|
||||
diff_iteratively diffs what is left without the call stack.
|
||||
*/
|
||||
static void diff_recursively(basic_json& result, const basic_json& source, const basic_json& target,
|
||||
const string_t& path, const std::size_t depth)
|
||||
const auto path_key = detail::concat<string_t>(path, '/', detail::escape(it.key()));
|
||||
result.push_back(
|
||||
{
|
||||
// if the values are the same, there is nothing to do
|
||||
if (source == target)
|
||||
{
|
||||
return;
|
||||
}
|
||||
|
||||
if (JSON_HEDLEY_UNLIKELY(depth >= detail::recursion_depth_limit()))
|
||||
{
|
||||
diff_iteratively(result, source, target, path);
|
||||
return;
|
||||
}
|
||||
|
||||
if (source.type() != target.type())
|
||||
{
|
||||
// different types: replace value
|
||||
diff_replace(result, path, target);
|
||||
return;
|
||||
}
|
||||
|
||||
switch (source.type())
|
||||
{
|
||||
case value_t::array:
|
||||
{
|
||||
// first pass: traverse common elements
|
||||
std::size_t i = 0;
|
||||
while (i < source.size() && i < target.size())
|
||||
{
|
||||
// recursive call to compare array values at index i
|
||||
diff_recursively(result, source[i], target[i], detail::concat<string_t>(path, '/', detail::to_string<string_t>(i)), depth + 1);
|
||||
++i;
|
||||
}
|
||||
|
||||
// We now reached the end of at least one array
|
||||
// in a second pass, traverse the remaining elements
|
||||
diff_array_tails(result, source, target, path, i);
|
||||
break;
|
||||
}
|
||||
|
||||
case value_t::object:
|
||||
{
|
||||
std::vector<typename object_t::key_type> common_keys;
|
||||
basic_json added_ops(value_t::array);
|
||||
if (diff_object_keys(result, source, target, path, common_keys, added_ops))
|
||||
{
|
||||
// fast path: common_keys is, by construction, the
|
||||
// subsequence of source's keys that are common to both
|
||||
// objects, in source's iteration order -- so it can be
|
||||
// walked in lockstep with `source` using a cheap key
|
||||
// comparison instead of another lookup. Deleted keys
|
||||
// (those source keys not in common_keys) are interleaved
|
||||
// here too, in source's original order, to match the
|
||||
// historical (pre-reordering-aware) output order.
|
||||
auto common_it = common_keys.cbegin();
|
||||
for (auto it = source.cbegin(); it != source.cend(); ++it)
|
||||
{
|
||||
if (common_it != common_keys.cend() && it.key() == *common_it)
|
||||
{
|
||||
diff_recursively(result, it.value(), target[it.key()], detail::concat<string_t>(path, '/', detail::escape(it.key())), depth + 1);
|
||||
++common_it;
|
||||
}
|
||||
else
|
||||
{
|
||||
// found a key that is not in target -> remove it
|
||||
diff_remove(result, detail::concat<string_t>(path, '/', detail::escape(it.key())));
|
||||
{"op", "add"}, {"path", path_key},
|
||||
{"value", it.value()}
|
||||
});
|
||||
}
|
||||
}
|
||||
|
||||
// append the "add" ops for brand-new keys collected by
|
||||
// diff_object_keys -- no second source.find() per target
|
||||
// key needed
|
||||
result.insert(result.end(), added_ops.begin(), added_ops.end());
|
||||
}
|
||||
break;
|
||||
}
|
||||
|
||||
@@ -33352,170 +33277,16 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
|
||||
default:
|
||||
{
|
||||
// both primitive types: replace value
|
||||
diff_replace(result, path, target);
|
||||
result.push_back(
|
||||
{
|
||||
{"op", "replace"}, {"path", path}, {"value", target}
|
||||
});
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/*!
|
||||
@brief @ref diff without the call stack, appending the operations to
|
||||
@a result
|
||||
|
||||
Produces the same operations as @ref diff_recursively. Only reached for
|
||||
values nested more deeply than @ref detail::recursion_depth_limit.
|
||||
*/
|
||||
static void diff_iteratively(basic_json& result, const basic_json& source, const basic_json& target,
|
||||
const string_t& path)
|
||||
{
|
||||
// The arrays and objects being diffed are kept on an explicit stack,
|
||||
// and every pair of elements is still diffed completely before the
|
||||
// next one, so the operations come out in the same order as in
|
||||
// diff_recursively. The path of the values being diffed is kept in
|
||||
// one buffer that grows and shrinks with the stack, rather than in a
|
||||
// new string per level.
|
||||
std::vector<diff_frame> stack;
|
||||
string_t current_path = path;
|
||||
|
||||
// diff `s` against `t`, whose path is current_path: primitives,
|
||||
// values of different types, and objects whose members were reordered
|
||||
// are handled right away; arrays and other objects get a frame
|
||||
const auto enter = [&result, &stack, ¤t_path](const basic_json & s, const basic_json & t)
|
||||
{
|
||||
// if the values are the same, there is nothing to do. Arrays and
|
||||
// objects are not compared up front: comparing them visits
|
||||
// everything below them, so doing that at every level would take
|
||||
// quadratic time in the nesting depth - equal ones yield no
|
||||
// operations anyway.
|
||||
if ((!s.is_structured() || !t.is_structured()) && s == t)
|
||||
{
|
||||
return;
|
||||
return result;
|
||||
}
|
||||
|
||||
if (s.type() != t.type())
|
||||
{
|
||||
// different types: replace value
|
||||
diff_replace(result, current_path, t);
|
||||
return;
|
||||
}
|
||||
|
||||
switch (s.type())
|
||||
{
|
||||
case value_t::array:
|
||||
{
|
||||
stack.emplace_back(&s, &t, current_path.size());
|
||||
return;
|
||||
}
|
||||
|
||||
case value_t::object:
|
||||
{
|
||||
std::vector<typename object_t::key_type> common_keys;
|
||||
basic_json added_ops(value_t::array);
|
||||
if (diff_object_keys(result, s, t, current_path, common_keys, added_ops))
|
||||
{
|
||||
// fast path: the frame walks source in lockstep with
|
||||
// common_keys, as diff_recursively does, and appends
|
||||
// added_ops once all members are done
|
||||
stack.emplace_back(&s, &t, current_path.size());
|
||||
stack.back().member = s.cbegin();
|
||||
stack.back().common_keys = std::move(common_keys);
|
||||
stack.back().added_ops = std::move(added_ops);
|
||||
}
|
||||
return;
|
||||
}
|
||||
|
||||
case value_t::null:
|
||||
case value_t::string:
|
||||
case value_t::boolean:
|
||||
case value_t::number_integer:
|
||||
case value_t::number_unsigned:
|
||||
case value_t::number_float:
|
||||
case value_t::binary:
|
||||
case value_t::discarded:
|
||||
default:
|
||||
{
|
||||
// both primitive types: replace value
|
||||
diff_replace(result, current_path, t);
|
||||
return;
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
enter(source, target);
|
||||
while (!stack.empty())
|
||||
{
|
||||
// the frame is copied out member by member and changed through
|
||||
// stack.back(): enter() may push a frame and the end of the loop
|
||||
// pops it, either of which would invalidate a reference to it
|
||||
const basic_json* const s = stack.back().source;
|
||||
const basic_json* const t = stack.back().target;
|
||||
const std::size_t path_length = stack.back().path_length;
|
||||
const std::size_t depth = stack.size();
|
||||
|
||||
if (s->is_array())
|
||||
{
|
||||
const auto& source_array = *s->m_data.m_value.array;
|
||||
const auto& target_array = *t->m_data.m_value.array;
|
||||
|
||||
// first pass: traverse common elements
|
||||
const std::size_t i = stack.back().index;
|
||||
if (i < source_array.size() && i < target_array.size())
|
||||
{
|
||||
++stack.back().index;
|
||||
detail::concat_into(current_path, '/', detail::to_string<string_t>(i));
|
||||
enter(source_array[i], target_array[i]);
|
||||
if (stack.size() == depth)
|
||||
{
|
||||
current_path.resize(path_length);
|
||||
}
|
||||
continue;
|
||||
}
|
||||
|
||||
// We now reached the end of at least one array
|
||||
// in a second pass, traverse the remaining elements
|
||||
diff_array_tails(result, *s, *t, current_path, i);
|
||||
}
|
||||
else
|
||||
{
|
||||
const const_iterator it = stack.back().member;
|
||||
if (it != s->cend())
|
||||
{
|
||||
++stack.back().member;
|
||||
const std::size_t next_common = stack.back().next_common;
|
||||
if (next_common < stack.back().common_keys.size() && it.key() == stack.back().common_keys[next_common])
|
||||
{
|
||||
++stack.back().next_common;
|
||||
const basic_json& target_value = (*t)[it.key()];
|
||||
detail::concat_into(current_path, '/', detail::escape(it.key()));
|
||||
enter(it.value(), target_value);
|
||||
if (stack.size() == depth)
|
||||
{
|
||||
current_path.resize(path_length);
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
// found a key that is not in target -> remove it
|
||||
diff_remove(result, detail::concat<string_t>(current_path, '/', detail::escape(it.key())));
|
||||
}
|
||||
continue;
|
||||
}
|
||||
|
||||
// append the "add" ops for brand-new keys collected when the
|
||||
// object was entered
|
||||
result.insert(result.end(), stack.back().added_ops.begin(), stack.back().added_ops.end());
|
||||
}
|
||||
|
||||
// this array or object is done: continue with the one it is in
|
||||
stack.pop_back();
|
||||
if (!stack.empty())
|
||||
{
|
||||
current_path.resize(stack.back().path_length);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
public:
|
||||
/// @}
|
||||
|
||||
////////////////////////////////
|
||||
|
||||
@@ -47,6 +47,21 @@ TEST_CASE("Tests with disabled exceptions")
|
||||
delete sax_no_exception::error_string; // NOLINT(cppcoreguidelines-owning-memory)
|
||||
}
|
||||
|
||||
SECTION("issue #5672 - value(json_pointer, default) must not abort for array tokens that are not a valid index")
|
||||
{
|
||||
const json j = {1, 2, 3};
|
||||
|
||||
// a syntactically valid index that is out of range for this array
|
||||
CHECK(j.value("/7"_json_pointer, 42) == 42);
|
||||
// a reference token that is not a number at all
|
||||
CHECK(j.value("/1a"_json_pointer, 42) == 42);
|
||||
// the empty reference token (JSON pointer "/")
|
||||
CHECK(j.value("/"_json_pointer, 42) == 42);
|
||||
// an index whose magnitude does not fit into size_type
|
||||
CHECK(j.value("/99999999999999999999999"_json_pointer, 42) == 42);
|
||||
CHECK(j.value("/18446744073709551615"_json_pointer, 42) == 42);
|
||||
}
|
||||
|
||||
SECTION("growing an ordered_json object")
|
||||
{
|
||||
auto j = nlohmann::ordered_json::object();
|
||||
|
||||
@@ -516,6 +516,21 @@ TEST_CASE_TEMPLATE("element access 2", Json, nlohmann::json, nlohmann::ordered_j
|
||||
CHECK(j_array.value("/-"_json_pointer, 42) == 42);
|
||||
CHECK(j_array_const.value("/-"_json_pointer, 42) == 42);
|
||||
|
||||
// Test an index with a non-digit after a valid leading digit; this is
|
||||
// out_of_range (not parse_error) and must not throw (see #5672)
|
||||
CHECK(j_array.value("/1a"_json_pointer, 42) == 42);
|
||||
CHECK(j_array_const.value("/1a"_json_pointer, 42) == 42);
|
||||
|
||||
// Test the empty reference token (JSON pointer "/"); see #5672
|
||||
CHECK(j_array.value("/"_json_pointer, 42) == 42);
|
||||
CHECK(j_array_const.value("/"_json_pointer, 42) == 42);
|
||||
|
||||
// Test an index whose magnitude does not fit into size_type (see #5672)
|
||||
CHECK(j_array.value("/99999999999999999999999"_json_pointer, 42) == 42);
|
||||
CHECK(j_array_const.value("/99999999999999999999999"_json_pointer, 42) == 42);
|
||||
CHECK(j_array.value("/18446744073709551615"_json_pointer, 42) == 42);
|
||||
CHECK(j_array_const.value("/18446744073709551615"_json_pointer, 42) == 42);
|
||||
|
||||
#if !defined(JSON_NOEXCEPTION)
|
||||
// Test malformed index (non-numeric) throws parse_error
|
||||
CHECK_THROWS_WITH_AS(j_array.value("/foo"_json_pointer, 1), "[json.exception.parse_error.109] parse error: array index 'foo' is not a number", typename Json::parse_error&);
|
||||
|
||||
@@ -15,65 +15,8 @@ using nlohmann::json;
|
||||
#endif
|
||||
|
||||
#include <fstream>
|
||||
#include <string>
|
||||
#include <vector>
|
||||
#include "make_test_data_available.hpp"
|
||||
|
||||
namespace
|
||||
{
|
||||
// alternating objects and arrays nested `depth` levels deep, with members that
|
||||
// depend on `variant` at some levels, so diffing two variants yields
|
||||
// operations on many levels: replacing the innermost value, adding, removing,
|
||||
// and (for ordered_json) reordering members, and changing array lengths
|
||||
template<typename BasicJsonType>
|
||||
BasicJsonType nested(const std::size_t depth, const int variant)
|
||||
{
|
||||
BasicJsonType value = variant;
|
||||
for (std::size_t i = 0; i < depth; ++i)
|
||||
{
|
||||
if (i % 2 == 0)
|
||||
{
|
||||
BasicJsonType object = BasicJsonType::object();
|
||||
if ((i + static_cast<std::size_t>(variant)) % 7 == 0)
|
||||
{
|
||||
object["x"] = i;
|
||||
}
|
||||
if (variant == 2 && i % 11 == 0)
|
||||
{
|
||||
object["z"] = "z";
|
||||
}
|
||||
object["a"] = std::move(value);
|
||||
if (variant == 1 && i % 5 == 0)
|
||||
{
|
||||
object["y"] = 1;
|
||||
}
|
||||
value = std::move(object);
|
||||
}
|
||||
else
|
||||
{
|
||||
BasicJsonType array = BasicJsonType::array({std::move(value)});
|
||||
if ((i + static_cast<std::size_t>(variant)) % 3 == 0)
|
||||
{
|
||||
array.push_back(i);
|
||||
}
|
||||
value = std::move(array);
|
||||
}
|
||||
}
|
||||
return value;
|
||||
}
|
||||
|
||||
// a path of `depth` reference tokens, as nested() nests its values
|
||||
std::string nested_path(const std::size_t depth)
|
||||
{
|
||||
std::string path;
|
||||
for (std::size_t i = depth; i > 0; --i)
|
||||
{
|
||||
path += (i - 1) % 2 == 0 ? "/a" : "/0";
|
||||
}
|
||||
return path;
|
||||
}
|
||||
} // namespace
|
||||
|
||||
TEST_CASE("JSON patch")
|
||||
{
|
||||
SECTION("examples from RFC 6902")
|
||||
@@ -1809,102 +1752,6 @@ TEST_CASE("JSON patch - diff emits array removals in descending index order")
|
||||
}
|
||||
}
|
||||
|
||||
TEST_CASE("JSON patch: diff of deeply nested values")
|
||||
{
|
||||
SECTION("the diff reproduces the target at every depth")
|
||||
{
|
||||
// depths on either side of the nesting depth up to which diff()
|
||||
// recurses (detail::recursion_depth_limit(), 128); not every depth up
|
||||
// to 300, as the test would then time out under Valgrind
|
||||
std::vector<std::size_t> depths;
|
||||
for (std::size_t depth = 0; depth <= 16; ++depth)
|
||||
{
|
||||
depths.push_back(depth);
|
||||
}
|
||||
for (std::size_t depth = 120; depth <= 136; ++depth)
|
||||
{
|
||||
depths.push_back(depth);
|
||||
}
|
||||
depths.push_back(300);
|
||||
|
||||
for (const auto depth : depths)
|
||||
{
|
||||
CAPTURE(depth);
|
||||
for (int from = 0; from < 3; ++from)
|
||||
{
|
||||
for (int to = 0; to < 3; ++to)
|
||||
{
|
||||
CAPTURE(from);
|
||||
CAPTURE(to);
|
||||
const auto source = nested<json>(depth, from);
|
||||
const auto target = nested<json>(depth, to);
|
||||
const auto patch = json::diff(source, target);
|
||||
CHECK(source.patch(patch) == target);
|
||||
CHECK(patch.empty() == (from == to));
|
||||
|
||||
const auto ordered_source = nested<nlohmann::ordered_json>(depth, from);
|
||||
const auto ordered_target = nested<nlohmann::ordered_json>(depth, to);
|
||||
CHECK(ordered_source.patch(nlohmann::ordered_json::diff(ordered_source, ordered_target)) == ordered_target);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
SECTION("a difference only in the innermost value is one replace operation")
|
||||
{
|
||||
for (std::size_t depth = 0; depth <= 300; ++depth)
|
||||
{
|
||||
CAPTURE(depth);
|
||||
json source = 1;
|
||||
json target = 2;
|
||||
for (std::size_t i = 0; i < depth; ++i)
|
||||
{
|
||||
source = i % 2 == 0 ? json::object({{"a", std::move(source)}}) : json::array({std::move(source)});
|
||||
target = i % 2 == 0 ? json::object({{"a", std::move(target)}}) : json::array({std::move(target)});
|
||||
}
|
||||
CHECK(json::diff(source, target, "/root") == json::array({{{"op", "replace"}, {"path", "/root" + nested_path(depth)}, {"value", 2}}}));
|
||||
}
|
||||
}
|
||||
|
||||
SECTION("values nested too deeply for the call stack (#5393)")
|
||||
{
|
||||
// diff() used to recurse once per nesting level, and compared the
|
||||
// values with operator== on every level. The values are only
|
||||
// parsed and diffed, never copied or compared, since those recurse
|
||||
// too.
|
||||
const std::size_t depth = 100000;
|
||||
for (const bool objects :
|
||||
{
|
||||
false, true
|
||||
})
|
||||
{
|
||||
CAPTURE(objects);
|
||||
std::string source_text;
|
||||
std::string target_text;
|
||||
std::string equal_text;
|
||||
std::string path;
|
||||
for (std::size_t i = 0; i < depth; ++i)
|
||||
{
|
||||
source_text += objects ? "{\"a\":" : "[";
|
||||
path += objects ? "/a" : "/0";
|
||||
}
|
||||
target_text = source_text + "2";
|
||||
equal_text = source_text + "1";
|
||||
source_text += "1";
|
||||
const std::string closing(depth, objects ? '}' : ']');
|
||||
const auto source = json::parse(source_text + closing);
|
||||
|
||||
const auto patch = json::diff(source, json::parse(target_text + closing));
|
||||
REQUIRE(patch.size() == 1);
|
||||
CHECK(patch[0]["op"] == "replace");
|
||||
CHECK(patch[0]["path"] == path);
|
||||
CHECK(patch[0]["value"] == 2);
|
||||
|
||||
CHECK(json::diff(source, json::parse(equal_text + closing)).empty());
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
TEST_CASE("JSON patch - diff() takes the fast path for non-reorderable object types (regression #5639)")
|
||||
{
|
||||
// #5465 added an order check to diff()'s object handling so a
|
||||
|
||||
Reference in New Issue
Block a user