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Niels Lohmann
81d66291c5
* create objects for tokens that cannot be array indices (#5357) When operator[](json_pointer) traverses a level that does not exist yet, the null value is turned into an array or an object depending on the reference token. The check only tested whether all characters are digits, so tokens that can never be a valid array index selected an array and then failed: - "01" (and any other token with a leading '0') threw parse_error.106 - the empty token threw out_of_range.404 Both tokens are valid object keys, and both work when the level already exists as an object, so creating the level changed the outcome. Test the token against the RFC 6901, Sect. 4 grammar for array indices instead, so that such tokens create an object. This only affects pointers that threw before. Signed-off-by: Niels Lohmann <mail@nlohmann.me> * Clarify that the token 0 is a valid array index in operator[] docs The note described valid array indices as "a nonempty sequence of digits without a leading 0", which read literally excludes the token "0" itself, contradicting both the code and the /foo/0/0/0 example in the next sentence. Spell out the RFC 6901 grammar instead. Signed-off-by: Niels Lohmann <mail@nlohmann.me> --------- Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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