Fix invalid float with no leading integer #120
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dylanahsmith
reviewed
Nov 6, 2020
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| if (ISDIGIT(c) || c == '-') { | ||
| if (ISDIGIT(c) || (c == '-' && str + 1 < end && ISDIGIT(str[1]))) { |
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This will make the strict parser more strict, so could be a breaking change. We should instead use Liquid::Usage.increment to instrument this change to determine if it will break any code in practice. If we determine that it is relied upon, then I think we will need to make the corresponding strict parsing in the ruby liquid gem less strict instead.
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When fuzzing with AFL there was an inconsistency in parsing floats. Liquid does not allow floats without a leading integer part, but liquid-c will allow a negative float without a leading integer part (e.g. liquid-c will parse
-.1as-0.1). I've added tests for this in liquid.