Add specs for regex literal expansion #13253
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straight-shoota
commented
Apr 3, 2023
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| private def regex_options(node) | ||
| Call.new(Path.global(["Regex", "Options"]).at(node), "new", NumberLiteral.new(node.options.value.to_s).at(node)).at(node) |
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The to_s is necessary to avoid a tight coupling between the value type of the compiler and stdlib. The base type of Regex::Options was changed to UInt64 in #13223.
straight-shoota
added
kind:bug
kind:regression
HertzDevil
approved these changes
Apr 4, 2023
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This is a useful addition in general and particularly prepares for #13252
Edit: Also discovers and fixes a bug (?) introduced in #13223.
Previous to #13223, the base type of
Regex::Optionswas the defaultInt32. That PR changed it toUInt64to gain more space.The parser creates an instance of
Regex::Optionsfrom the modifier flags of a regex literal. When the compiler expands them, the option value is expressed by the base type value of theRegex::Optionstype. The resulting number literal is typed, so the expression for theMULTILINEoptions value would change from::Regex::Options.new(6)to::Regex::Options.new(6_u64).Now this isn't an immediate problem when the base type of
Regex::Optionsin the compiler and stdlib align. And even if they don't, autocasting of integer literals should allow the generated code to be compatible with olderRegex::Optionsimplementations withInt32base type.Still, I think it's better to avoid such unintended side effects and keep the generated code consistent until we explicitly chose to change it for good as discussed in #13252.
The different domain range of
Int32andUInt64is irrelevant for this because the compiler only handles the three modifiers and the biggest integer value needed to represent them is15(forimx).