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Niels Lohmann 3dbed2a0cb Derive the lexer position lazily for seekable input

The lexer counted the read position on every character: two increments
and a newline check per get(), all on members kept in memory. For
seekable input (pointers, strings, other random-access byte ranges) the
position can be derived instead: chars_read_total is the adapter's read
count (including reads at EOF) minus a pending unget, and line and
column are recomputed from the consumed input only when get_position()
is called, i.e. on parse errors. JSON_DIAGNOSTIC_POSITIONS uses the new
O(1) get_chars_read_total(). Stream, file, wide-string and user-defined
adapters keep the eager counters.

Parsing pretty-printed input gets 8-12% faster and accept() 12-27%
(canada, citm_catalog, twitter; clang 21 arm64 and GCC 13 x86-64).
Error messages, byte offsets, SAX positions and diagnostic positions are
unchanged (differential comparison against develop on 548k inputs).

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

2026-10-13 08:52:49 +02:00

docset

Check the URL scheme before downloading in generate_docset.py (#5803 )

2026-10-10 16:21:53 +02:00

mkdocs

Derive the lexer position lazily for seekable input

2026-10-13 08:52:49 +02:00

avatars.png

🔖 set version to 3.12.0 (#4727 )

2025-04-11 10:41:14 +02:00

json.gif

🔖 set version to 3.12.0 (#4727 )

2025-04-11 10:41:14 +02:00

Makefile

Review and extend the documentation, and check it in CI (#5638 )

2026-10-02 11:32:15 +02:00

README.md

Clean up non-code files (#5801 )

2026-10-11 08:21:51 +02:00

README.md

Documentation

Generate documentation

Note on documentation: The source files contain links to the online documentation at https://json.nlohmann.me.
This URL provides the most recent documentation and also applies to previous versions. Documentation for deprecated functions is not removed; instead, it is marked as deprecated.

If you want to view the documentation for a specific tag or commit hash, you can generate it locally as follows (example using tag v3.12.0):

git clone https://github.com/nlohmann/json.git
cd json
git checkout v3.12.0
make install_venv serve -C docs/mkdocs

Open http://127.0.0.1:8000/ in your browser. Replace any URL in the source code that points to https://json.nlohmann.me with http://127.0.0.1:8000 to view the documentation for the selected tag or commit hash.