[swift-evolution] [Review] SE-0182 - String Newline Escaping

[T.J. Usiyan]

+1

Maintaining parity between single and multi line strings is nice even
though breaking scope is a strong argument against actually using this with
single line literals.

On Wed, Jul 12, 2017 at 7:15 PM, Timothy Wood via swift-evolution <
swift-evolution at swift.org> wrote:

>
> +1 This seems great to me.  It seems worth calling out how escaping of
> backslashes and escaping of newlines interact for testing:
>
>
>         let s = """
>         line fragment ending in backslash \\\
>         and
>         line fragment ending in backslash \\\
>         \\followed by line fragment starting with backslash
>         """
>
> I would expect to get "line fragment ending in backslash \\and\nline
> fragment ending in backslash\\\\followed by line fragment starting with
> backslash”, that is, escaped backslashes at the end of line fragments
> should be retained, and whatever concatenates line fragments shouldn’t
> accidentally double-interpret backslashes.
>
> Alternatively:
>
>         let s = """
>         line ending in backslash \\
>         and
>         line ending in backslash \\
>         \\followed by line starting with backslash
>         """
>
> seems like it should produce the result "line ending in backslash
> \\\nand\nline ending in backslash\\\n\\followed by line starting with
> backslash”, that is, the consumption of escaped backslashes should happen
> before considering if there is an extra backslash on the end of the line
> for an escaped newline.
>
> -tim
>
>
>
> > On Jul 12, 2017, at 3:52 PM, Chris Lattner via swift-evolution <
> swift-evolution at swift.org> wrote:
> >
> > Hello Swift community,
> >
> > Context: As part of winding down work on Swift 4, we are considering
> SE-0182 as a refinement to SE-0168.  We are specifically not opening the
> floodgates for new proposals just yet, and it is not considered in scope to
> resyntax all of multi-line string literals.  We’re just discussing this one
> potential small-scope refinement to an existing Swift 4 feature.
> >
> >
> > The review of "String Newline Escaping" begins now and runs through July
> 17, 2017. The proposal is available here:
> > https://github.com/apple/swift-evolution/blob/master/
> proposals/0182-newline-escape-in-strings.md
> >
> > Reviews are an important part of the Swift evolution process. All
> reviews should be sent to the swift-evolution mailing list at
> > https://lists.swift.org/mailman/listinfo/swift-evolution
> >
> > or, if you would like to keep your feedback private, directly to the
> review manager. When replying, please try to keep the proposal link at the
> top of the message:
> >
> > What goes into a review?
> >
> > The goal of the review process is to improve the proposal under review
> through constructive criticism and, eventually, determine the direction of
> Swift. When writing your review, here are some questions you might want to
> answer in your review:
> >
> >       • What is your evaluation of the proposal?
> >       • Is the problem being addressed significant enough to warrant a
> change to Swift?
> >       • Does this proposal fit well with the feel and direction of Swift?
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> >
> > More information about the Swift evolution process is available at:
> > https://github.com/apple/swift-evolution/blob/master/process.md
> >
> >
> > Thank you,
> >
> > Chris Lattner
> > Review Manager
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