Niels Lohmann 7ed54e3d59 Unflatten without splitting keys or walking each path from the root ...

unflatten() split every key into a vector of reference tokens, stored the
pointer prefixes in a tree to decide which values become arrays, and then
looked up every token of every key from the root again.

Keys are now checked by a scan that raises the same parse_error.107/108 as
split(), skipping the part a key shares with the previous one, which was
checked already. The prefixes that denote arrays are kept in a small hash
set of key slices; the array/object decision is unchanged. The walk keeps
the values along the previous key's path, so only the part of a key that
differs from the previous one is looked up. Keys of a flattened object are
usually sorted, so that part is short.

unflatten() of canada.json, citm_catalog.json and twitter.json is 1.9x to
2.3x as fast; the output and the exceptions are unchanged.

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

2026-10-16 19:38:21 +02:00

..

nlohmann

Unflatten without splitting keys or walking each path from the root

2026-10-16 19:38:21 +02:00