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Add the node index and scanning primitives of json_view (internal)

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Internal parts of the zero-copy view (#5295), under detail/view and not
included by json.hpp, so that users of json.hpp compile nothing of it:

- macro_scope.hpp/macro_unscope.hpp: the few macros the view needs, under
  its own prefix (json.hpp undefines its own at its end); the throw macro
  honors JSON_NOEXCEPTION and JSON_THROW_USER like JSON_THROW
- string_ref.hpp: std::string_view from C++17 on, else a small stand-in
- node.hpp: the 16-byte node of the index; its kinds are value_t values
  (checked by a static_assert)
- document_data.hpp: the storage of a parsed document (node array, decode
  arena, owned input)
- scan.hpp: string and digit scanning with unrolled checks at fixed offsets
  (after yyjson) and the library's SWAR and UTF-8 checks, independent of the
  byte order

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann
2026-09-29 03:49:29 +02:00
parent 6936b95a65
commit 1ab017bbfe
7 changed files with 609 additions and 0 deletions
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BUILD.bazel
+6
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@@ -66,6 +66,12 @@ cc_library(
"include/nlohmann/detail/string_escape.hpp",
"include/nlohmann/detail/string_utils.hpp",
"include/nlohmann/detail/value_t.hpp",
"include/nlohmann/detail/view/document_data.hpp",
"include/nlohmann/detail/view/macro_scope.hpp",
"include/nlohmann/detail/view/macro_unscope.hpp",
"include/nlohmann/detail/view/node.hpp",
"include/nlohmann/detail/view/scan.hpp",
"include/nlohmann/detail/view/string_ref.hpp",
"include/nlohmann/json.hpp",
"include/nlohmann/json_fwd.hpp",
"include/nlohmann/ordered_map.hpp",