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Fix cross-environment API-surface drift and lint findings from CI

Browse Source 
extract_api.py's own extraction wasn't deterministic across machines, which
CI's drift check caught immediately: JSON_HAS_RANGES auto-detects via the
standard library's __cpp_lib_ranges feature-test macro, which isn't reliably
gated to C++20 mode by every stdlib -- undefined under -std=c++17 with macOS's
libc++, but defined under the identical flag with the Ubuntu stdlib CI uses,
so parse()/accept()/from_*() extracted different signatures purely depending
on which machine ran the extraction. Pinned to -DJSON_HAS_RANGES=0: the
deterministic and safe choice, since pinning to 1 was tried first and found to
fail to parse on a stdlib without full <ranges> support even when the macro
claims otherwise.

Also found and fixed a second, independent source of the same class of drift:
get_identity_name() used cursor.spelling verbatim for CONVERSION_FUNCTION
cursors, which libclang renders as its own internally-canonicalized form of
the return type rather than what's literally written. Confirmed for
json_pointer::operator string_t() spelling differently on two machines
pinned to the identical libclang==18.1.1 wheel, with the JSON_HAS_RANGES fix
above ruled out as the cause. Now derived from the cursor's own raw source
text instead, immune to libclang's dependent-type resolution differences and
incidentally more readable than the libclang-internal forms it replaces.

Bumped SURFACE_FORMAT_VERSION to 3 and regenerated all 27 history snapshots
and the committed api_surface.json; both fixes are documented in
tools/api_checker/history/README.md's format-history log.

Also fixes diff_api.py's format_version guard, which only compared the two
loaded surfaces against each other and never against SURFACE_FORMAT_VERSION
(what this build actually understands) -- two surfaces on the same,
newer-than-expected format_version would have silently passed the guard.

Remaining fixes are the concretely actionable findings from Codacy's review
of the new tools/api_checker/ files: unused imports/variables, a stray
f-string with no placeholders. Left the docstring-formatting nitpicks
(pydocstyle D2xx/D4xx) and generic subprocess-usage notices alone -- the
former has no established convention elsewhere in this codebase's Python
tooling to conform to, and the latter are inherent to a dev tool that shells
out to git/clang with developer-controlled arguments, not user input.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels LohmannandClaude Sonnet 5 committed 2026-07-11 18:59:19 +02:00
1 parent f23b3c63a2
commit 0663907b68
33 files changed
+227 -160
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tools/api_checker/history/README.md
+23
View File
@@ -36,6 +36,29 @@ Backfilled: every `v3.*` tag from `v3.1.0` through the latest release at backfil
All 27 files were regenerated under `format_version: 2`; only `v3.11.0.json` and `v3.11.1.json`
actually changed content (every other tag's scopes never contained the old-style tag).
- **`format_version: 3`**. Found via a CI run on a different machine than the one that generated
`format_version: 2`, which is exactly the failure class this versioning exists to catch:
1. `JSON_HAS_RANGES` auto-detects via the standard library's `__cpp_lib_ranges` feature-test
macro. That macro isn't reliably gated to C++20 mode by every stdlib -- undefined under
`-std=c++17` with macOS's libc++, but defined under the identical flag with the Ubuntu
stdlib used in CI -- so `parse()`/`accept()`/`from_bjdata()`/etc. extracted a different
signature (with or without a `SentinelType` parameter) purely depending on which machine
ran the extraction. Now pinned to `-DJSON_HAS_RANGES=0` in `extract_api.py`'s parse
arguments: the deterministic choice, since forcing `1` was tried first and found to
actually fail to parse on a stdlib without full `<ranges>` support even when the macro
claims otherwise.
2. `get_identity_name()` used `cursor.spelling` verbatim for `CONVERSION_FUNCTION` cursors,
which libclang renders as its own internally-canonicalized form of the return type rather
than what's literally written. Confirmed for `json_pointer::operator string_t()`: spelled
`"operator nlohmann::json_pointer::string_t_helper<type-parameter-0-0>::type"` on one
machine and `"operator typename string_t_helper<type-parameter-0-0>::type"` on another,
with both machines pinned to the identical `libclang==18.1.1` wheel and the JSON_HAS_RANGES
fix above ruled out as the cause. Now derived from the cursor's own raw source text instead
(regex over `get_signature_text()`'s output), immune to libclang's dependent-type
resolution differences and incidentally more readable
(`"operator string_t"`/`"operator ValueType"` instead of the libclang-internal forms).
All 27 files were regenerated under `format_version: 3`.
## Known gaps
- **`v3.0.0`, `v3.0.1`**: not backfilled. These predate the `include/nlohmann/` directory
tools/api_checker/history/v3.1.0.json
+5 -5
View File
@@ -1,9 +1,9 @@
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@@ -1674,7 +1674,7 @@
"tier": "callable"
},
{
"identity_name": "operator basic_string",
"identity_name": "operator std::string",
"kind": "CONVERSION_FUNCTION",
"name": "operator basic_string",
"pretty_signature": "nlohmann::json_pointer::operator basic_string",
tools/api_checker/history/v3.1.1.json
+5 -5
View File
@@ -1,9 +1,9 @@
{
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@@ -1080,7 +1080,7 @@
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@@ -1089,7 +1089,7 @@
"tier": "callable"
},
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"identity_name": "operator type-parameter-1-0",
"identity_name": "operator ValueType",
"kind": "FUNCTION_TEMPLATE",
"name": "operator type-parameter-1-0",
"pretty_signature": "nlohmann::basic_json::operator type-parameter-1-0",
@@ -1674,7 +1674,7 @@
"tier": "callable"
},
{
"identity_name": "operator basic_string",
"identity_name": "operator std::string",
"kind": "CONVERSION_FUNCTION",
"name": "operator basic_string",
"pretty_signature": "nlohmann::json_pointer::operator basic_string",
tools/api_checker/history/v3.1.2.json
+5 -5
View File
@@ -1,9 +1,9 @@
{
"format_version": 2,
"format_version": 3,
"meta": {
"commit": "d2dd27dc3b8472dbaa7d66f83619b3ebcd9185fe",
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"generator": "tools/api_checker/extract_api.py",
"ref": "v3.1.2"
},
@@ -1098,7 +1098,7 @@
"tier": "type"
},
{
"identity_name": "operator nlohmann::detail::value_t",
"identity_name": "operator value_t",
"kind": "CONVERSION_FUNCTION",
"name": "operator nlohmann::detail::value_t",
"pretty_signature": "nlohmann::basic_json::operator nlohmann::detail::value_t",
@@ -1107,7 +1107,7 @@
"tier": "callable"
},
{
"identity_name": "operator type-parameter-1-0",
"identity_name": "operator ValueType",
"kind": "FUNCTION_TEMPLATE",
"name": "operator type-parameter-1-0",
"pretty_signature": "nlohmann::basic_json::operator type-parameter-1-0",
@@ -1692,7 +1692,7 @@
"tier": "callable"
},
{
"identity_name": "operator basic_string",
"identity_name": "operator std::string",
"kind": "CONVERSION_FUNCTION",
"name": "operator basic_string",
"pretty_signature": "nlohmann::json_pointer::operator basic_string",
tools/api_checker/history/v3.10.0.json
+5 -5
View File
@@ -1,9 +1,9 @@
{
"format_version": 2,
"format_version": 3,
"meta": {
"commit": "f42a74b8f53cc308647123d49d33d1c8122e3f42",
"extracted_from": "include/nlohmann/json.hpp",
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"generated_at": "2026-07-11T16:52:55.105287+00:00",
"generator": "tools/api_checker/extract_api.py",
"ref": "v3.10.0"
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@@ -1359,7 +1359,7 @@
"tier": "type"
},
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"identity_name": "operator nlohmann::detail::value_t",
"identity_name": "operator value_t",
"kind": "CONVERSION_FUNCTION",
"name": "operator nlohmann::detail::value_t",
"pretty_signature": "nlohmann::basic_json::operator nlohmann::detail::value_t",
@@ -1368,7 +1368,7 @@
"tier": "callable"
},
{
"identity_name": "operator type-parameter-1-0",
"identity_name": "operator ValueType",
"kind": "FUNCTION_TEMPLATE",
"name": "operator type-parameter-1-0",
"pretty_signature": "nlohmann::basic_json::operator type-parameter-1-0",
@@ -2151,7 +2151,7 @@
"tier": "callable"
},
{
"identity_name": "operator basic_string",
"identity_name": "operator std::string",
"kind": "CONVERSION_FUNCTION",
"name": "operator basic_string",
"pretty_signature": "nlohmann::json_pointer::operator basic_string",
tools/api_checker/history/v3.10.1.json
+5 -5
View File
@@ -1,9 +1,9 @@
{
"format_version": 2,
"format_version": 3,
"meta": {
"commit": "7194245a314d142a5560f6906a87f7c67ebbcf2e",
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"generated_at": "2026-07-11T16:52:56.526088+00:00",
"generator": "tools/api_checker/extract_api.py",
"ref": "v3.10.1"
},
@@ -1359,7 +1359,7 @@
"tier": "type"
},
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"identity_name": "operator nlohmann::detail::value_t",
"identity_name": "operator value_t",
"kind": "CONVERSION_FUNCTION",
"name": "operator nlohmann::detail::value_t",
"pretty_signature": "nlohmann::basic_json::operator nlohmann::detail::value_t",
@@ -1368,7 +1368,7 @@
"tier": "callable"
},
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"identity_name": "operator type-parameter-1-0",
"identity_name": "operator ValueType",
"kind": "FUNCTION_TEMPLATE",
"name": "operator type-parameter-1-0",
"pretty_signature": "nlohmann::basic_json::operator type-parameter-1-0",
@@ -2151,7 +2151,7 @@
"tier": "callable"
},
{
"identity_name": "operator basic_string",
"identity_name": "operator std::string",
"kind": "CONVERSION_FUNCTION",
"name": "operator basic_string",
"pretty_signature": "nlohmann::json_pointer::operator basic_string",
tools/api_checker/history/v3.10.2.json
+5 -5
View File
@@ -1,9 +1,9 @@
{
"format_version": 2,
"format_version": 3,
"meta": {
"commit": "e75e71e2b3293752b789e8e9d9c709144fea5ddf",
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@@ -1359,7 +1359,7 @@
"tier": "type"
},
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"identity_name": "operator nlohmann::detail::value_t",
"identity_name": "operator value_t",
"kind": "CONVERSION_FUNCTION",
"name": "operator nlohmann::detail::value_t",
"pretty_signature": "nlohmann::basic_json::operator nlohmann::detail::value_t",
@@ -1368,7 +1368,7 @@
"tier": "callable"
},
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"identity_name": "operator type-parameter-1-0",
"identity_name": "operator ValueType",
"kind": "FUNCTION_TEMPLATE",
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"pretty_signature": "nlohmann::basic_json::operator type-parameter-1-0",
@@ -2151,7 +2151,7 @@
"tier": "callable"
},
{
"identity_name": "operator basic_string",
"identity_name": "operator std::string",
"kind": "CONVERSION_FUNCTION",
"name": "operator basic_string",
"pretty_signature": "nlohmann::json_pointer::operator basic_string",
tools/api_checker/history/v3.10.3.json
+5 -5
View File
@@ -1,9 +1,9 @@
{
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"pretty_signature": "nlohmann::json_pointer::operator basic_string",
tools/api_checker/history/v3.10.4.json
+5 -5
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@@ -1,9 +1,9 @@
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@@ -2151,7 +2151,7 @@
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"identity_name": "operator std::string",
"kind": "CONVERSION_FUNCTION",
"name": "operator basic_string",
"pretty_signature": "nlohmann::json_pointer::operator basic_string",
tools/api_checker/history/v3.10.5.json
+5 -5
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@@ -1,9 +1,9 @@
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@@ -1368,7 +1368,7 @@
"tier": "callable"
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"identity_name": "operator type-parameter-1-0",
"identity_name": "operator ValueType",
"kind": "FUNCTION_TEMPLATE",
"name": "operator type-parameter-1-0",
"pretty_signature": "nlohmann::basic_json::operator type-parameter-1-0",
@@ -2151,7 +2151,7 @@
"tier": "callable"
},
{
"identity_name": "operator basic_string",
"identity_name": "operator std::string",
"kind": "CONVERSION_FUNCTION",
"name": "operator basic_string",
"pretty_signature": "nlohmann::json_pointer::operator basic_string",
tools/api_checker/history/v3.11.0.json
+5 -5
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@@ -1,9 +1,9 @@
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@@ -1476,7 +1476,7 @@
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tools/api_checker/history/v3.11.1.json
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"identity_name": "operator nlohmann::json_pointer::string_t_helper<type-parameter-0-0>::type",
"identity_name": "operator string_t",
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tools/api_checker/history/v3.11.2.json
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"identity_name": "operator std::string",
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"name": "operator basic_string",
"pretty_signature": "nlohmann::json_pointer::operator basic_string",