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Report one-character non-numeric array indices like longer ones (#5800)

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* Report one-character non-numeric array indices like longer ones

A JSON pointer reference token that is not a number but has only one
character (e.g. "/a/x") was reported as out_of_range.404 ("unresolved
reference token"), because the "is not a number" check only ran for
tokens longer than one character; "/a/xy" got parse_error.109. Both now
throw parse_error.109. "-" and the empty token are still reported as
out_of_range.404. As a consequence, value(json_pointer, default) on an
array now throws for "/x" as it already did for "/xy".

Also document why ordered_map::erase's destroy/placement-new loop on
pair<const Key, T> is kept despite [basic.life]/8 before C++20.

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

* Document the one-character array index change

Add 3.13.0 version-history entries to at, operator[], value, patch,
patch_inplace, and unflatten, and describe in exceptions.md which array
indices throw parse_error.109 and which out_of_range.404.

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

---------

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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Niels Lohmann authored and GitHub committed 2026-10-11 08:21:41 +02:00
1 parent 1649d9eda4
commit 2cca04ae6f
13 files changed
+95 -13
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tests/src/unit-element_access2.cpp
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@@ -535,6 +535,8 @@ TEST_CASE_TEMPLATE("element access 2", Json, nlohmann::json, nlohmann::ordered_j
// 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&);
CHECK_THROWS_WITH_AS(j_array_const.value("/foo"_json_pointer, 1), "[json.exception.parse_error.109] parse error: array index 'foo' is not a number", typename Json::parse_error&);
CHECK_THROWS_WITH_AS(j_array.value("/x"_json_pointer, 1), "[json.exception.parse_error.109] parse error: array index 'x' is not a number", typename Json::parse_error&);
CHECK_THROWS_WITH_AS(j_array_const.value("/x"_json_pointer, 1), "[json.exception.parse_error.109] parse error: array index 'x' is not a number", typename Json::parse_error&);
// Test leading-zero index throws parse_error
CHECK_THROWS_WITH_AS(j_array.value("/01"_json_pointer, 1), "[json.exception.parse_error.106] parse error: array index '01' must not begin with '0'", typename Json::parse_error&);