[5.7] [Parse] Allow prefix operators containing / with /.../ regex literals
#58860
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Treat a prefix operator containing `/` the same as the unapplied infix operator case, where we tentatively lex. This means that we bail if there is no closing `/` or the starting character is invalid. This leaves binary operator containing `/` in expression position as the last place where we know that we definitely have a regex literal.
Previously we would only check for a starting character of `)` when performing a tentative lex of a regex literal. Expand this to cover the entire range of the regex literal, ensuring to take escapes and custom character classes into account.
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@swift-ci please test |
airspeedswift
approved these changes
May 12, 2022
AnthonyLatsis
added
🍒 release cherry pick
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5.7 cherry-pick of #58835
When lexing a regex literal, treat a prefix operator containing
/the same as the unapplied infix operator case, where we tentatively lex. This means that we bail if there is no closing/or the starting character is invalid. This leaves binary operator containing/in expression position as the last place where we know that we definitely have a regex literal.Additionally, expand the starting
)character heuristic to cover the entire range of the regex literal, ensuring to take escapes and custom character classes into account. This means we will not lex a regex literal if there is an unbalanced)somewhere in the body.