[3.8] bpo-37587: Make json.loads faster for long strings (GH-14752) #15022
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When scanning the string, most characters are valid, so checking for invalid characters first means never needing to check the value of strict on valid strings, and only needing to check it on invalid characters when doing non-strict parsing of invalid strings. This provides a measurable reduction in per-character processing time (~11% in the pre-merge patch testing). (cherry picked from commit 8a758f5) Co-authored-by: Marco Paolini <mpaolini@users.noreply.github.com>
ncoghlan
approved these changes
Jul 30, 2019
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When scanning the string, most characters are valid, so
checking for invalid characters first means never needing
to check the value of strict on valid strings, and only
needing to check it on invalid characters when doing
non-strict parsing of invalid strings.
This provides a measurable reduction in per-character
processing time (~11% in the pre-merge patch testing).
(cherry picked from commit 8a758f5)
Co-authored-by: Marco Paolini mpaolini@users.noreply.github.com
https://bugs.python.org/issue37587