[swift-evolution] [Pitch] Raw mode string literals

Daniel Duan daniel at duan.ca
Thu Nov 23 14:05:15 CST 2017

I eh, literally just ran into a situation where this feature would have been super useful: 

Someone sent me a JSON string with “\” in it. I needed to plug it into the UI logic to test something but I had to escape the “\”s again to make JSONSerialization happy.

A raw string literal syntax, especially when combined with multi line literals, would be very helpful.

That said, how/whether this syntax compose with multi line literal, interpolation, and the potential regex literal Chris mentioned earlier, deserves thorough consideration and deliberation.

Daniel Duan
Sent from my iPhone

> On Nov 23, 2017, at 11:12 AM, Brent Royal-Gordon via swift-evolution <swift-evolution at swift.org> wrote:
>> On Nov 23, 2017, at 11:15 AM, Chris Lattner via swift-evolution <swift-evolution at swift.org> wrote:
>> Until we figure out that path forward for regex’s, I think they aren’t the right motivation for this proposal.
> 1. Even in our shining pattern matching future—a future which I, for one, am eager to hasten—we will still need to interoperate with NSRegularExpression and other Perl 5-compatible regex engines.
> 2. Code generation.
> 3. Windows-style paths. 
> 4. Doesn’t LaTeX use backslashes?
> 5. Etc. 
> I think the Motivation section undersells this proposal. Regexes are a strong short-run use case, but in the long run, we’ll need this for other things. In both cases, though, raw literals will be a useful addition to the language, improving the clarity of Swift code much like multiline literals already have. 
> -- 
> Brent Royal-Gordon
> Sent from my iPhone
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