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Niels Lohmann
7c26e99ac5
With ensure_ascii, the view's dump wrote every string through the escaping path, which decodes UTF-8 byte by byte, even strings of the source that are plain ASCII. A string of the source without escape sequences has no quote, backslash, or control character, so ensure_ascii leaves it unchanged exactly when it has no byte >= 0x7F. The dump now checks that eight bytes at a time (one add and one or per word) and copies such strings like the dump without ensure_ascii. The compact walk (dump_compact) now also serves ensure_ascii, through a separate out-of-line instantiation, so the walk without ensure_ascii keeps its speed. Parsing is unchanged. A flag set by the parser would let the dump skip the check and was about twice as fast for compact output, but it costs every parse of string-heavy input 1-2% with GCC. Signed-off-by: Niels Lohmann <mail@nlohmann.me>