<div dir="ltr">We had a very full debate about which way was superior during review; it was proposed to behave one way and the core team decided on the other. We have to let settled decisions be settled: that's the only way Swift Evolution will continue to work.<div><br></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Apr 19, 2017 at 5:15 PM, Kevin Nattinger via swift-evolution <span dir="ltr"><<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word">I agree, but unfortunately it’s probably too late now.<div><div class="h5"><div><br><div><blockquote type="cite"><div>On Apr 19, 2017, at 3:11 PM, Martin Waitz via swift-evolution <<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>> wrote:</div><br class="m_-1153828080461882838Apple-interchange-newline"><div><div style="word-wrap:break-word"><div>Hi,</div><div><br></div><div>I think, it would be more natural to include the last newline.</div><div>Multi-line String literals are for multiple lines.</div><div>And each line ends in a <span style="font-family:Menlo;background-color:rgb(255,255,255)">\n</span><span style="background-color:rgb(255,255,255)">. Otherwise it wouldn’t be a line.</span></div><div><br></div><div>Having</div><div><div style="margin:0px;line-height:normal;font-family:Menlo;background-color:rgb(255,255,255)"><span style="font-variant-ligatures:no-common-ligatures"> """</span></div><div style="margin:0px;line-height:normal;font-family:Menlo;background-color:rgb(255,255,255)"><span style="font-variant-ligatures:no-common-ligatures"> line 1</span></div><div style="margin:0px;line-height:normal;font-family:Menlo;background-color:rgb(255,255,255)"><span style="font-variant-ligatures:no-common-ligatures"> """</span></div><div style="margin:0px;line-height:normal;font-family:Menlo;background-color:rgb(255,255,255)"><span style="font-variant-ligatures:no-common-ligatures"> +</span></div><div style="margin:0px;line-height:normal;font-family:Menlo;background-color:rgb(255,255,255)"><span style="font-variant-ligatures:no-common-ligatures"> """</span></div><div style="margin:0px;line-height:normal;font-family:Menlo;background-color:rgb(255,255,255)"><span style="font-variant-ligatures:no-common-ligatures"> line 2</span></div><div style="margin:0px;line-height:normal;font-family:Menlo;background-color:rgb(255,255,255)"><span style="font-variant-ligatures:no-common-ligatures"> """</span></div><div style="margin:0px;line-height:normal;font-family:Menlo;background-color:rgb(255,255,255)"><span style="font-variant-ligatures:no-common-ligatures"> ==</span></div><div style="margin:0px;line-height:normal;font-family:Menlo;background-color:rgb(255,255,255)"><span style="font-variant-ligatures:no-common-ligatures"> """</span></div><div style="margin:0px;line-height:normal;font-family:Menlo;background-color:rgb(255,255,255)"><span style="font-variant-ligatures:no-common-ligatures"> line 1</span></div><div style="margin:0px;line-height:normal;font-family:Menlo;background-color:rgb(255,255,255)"><span style="font-variant-ligatures:no-common-ligatures"> line 2</span></div><div style="margin:0px;line-height:normal;font-family:Menlo;background-color:rgb(255,255,255)"><span style="font-variant-ligatures:no-common-ligatures"> """</span></div></div><div><span style="font-variant-ligatures:no-common-ligatures"><br></span></div><div>makes a lot of sense to me.</div><div><br></div><div>Or do we want to magically add a trailing newline everywhere as we do in print()?</div><div>Better change print to only add the newline when necessary! (e.g. by adding a new parameter which defaults to „auto“)</div><div><br></div><div>— </div><div>Martin</div><br><div><blockquote type="cite"><div>Am 19.04.2017 um 23:51 schrieb Adrian Zubarev via swift-evolution <<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>>:</div><br class="m_-1153828080461882838Apple-interchange-newline"><div><div class="m_-1153828080461882838bloop_markdown" style="font-family:Helvetica,Arial;font-size:13px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(254,254,254)"><p style="margin:15px 0px">This is the natural way of text blocks. If you really need a blank line you can add one at the start/end or alternatively use<span class="m_-1153828080461882838Apple-converted-space"> </span><code style="font-family:Menlo,Consolas,'Liberation Mono',Courier,monospace;font-size:10pt;border-top-left-radius:3px;border-top-right-radius:3px;border-bottom-right-radius:3px;border-bottom-left-radius:3px;background-color:rgb(248,248,248);color:inherit;border:1px solid rgb(234,234,234);margin:0px 2px;padding:0px 5px;word-break:normal;word-wrap:normal">\n</code>.</p><pre style="margin:15px 0px;font-family:Menlo,Consolas,'Liberation Mono',Courier,monospace;font-size:10pt;border-top-left-radius:3px;border-top-right-radius:3px;border-bottom-right-radius:3px;border-bottom-left-radius:3px;background-color:rgb(248,248,248);color:inherit;border:1px solid rgb(204,204,204);overflow:auto;padding:4px 8px;word-break:normal;word-wrap:normal"><code class="m_-1153828080461882838swift" style="font-family:Menlo,Consolas,'Liberation Mono',Courier,monospace;font-size:10pt;border-top-left-radius:3px;border-top-right-radius:3px;border-bottom-right-radius:3px;border-bottom-left-radius:3px;background-color:rgb(248,248,248);color:inherit;border:0px;margin:0px;padding:0px;word-break:normal;word-wrap:normal">"""
Foo
"""
// Equals "\nFoo\n"
</code></pre><div style="margin:15px 0px"><br class="m_-1153828080461882838webkit-block-placeholder"></div></div><div class="m_-1153828080461882838bloop_original_html" style="font-family:Helvetica,Arial;font-size:13px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(254,254,254)"><div id="m_-1153828080461882838bloop_customfont" style="font-family:Helvetica,Arial;font-size:13px;margin:0px"><br></div><br><div id="m_-1153828080461882838bloop_sign_1492638545923299072" class="m_-1153828080461882838bloop_sign"><div style="font-family:helvetica,arial;font-size:13px">-- <br>Adrian Zubarev<br>Sent with Airmail</div></div><br><p class="m_-1153828080461882838airmail_on" style="margin:15px 0px">Am 19. April 2017 um 22:53:07, Vladimir.S via swift-evolution (<a href="mailto:swift-evolution@swift.org" style="color:rgb(65,131,196);background-color:inherit;text-decoration:none" target="_blank">swift-evolution@swift.org</a>) schrieb:</p><blockquote type="cite" class="m_-1153828080461882838clean_bq" style="margin:15px 0px"><span style="margin-top:0px;margin-bottom:0px"><div><div></div><div>On 19.04.2017 23:03, Joe Groff via swift-evolution wrote:<br>> Proposal Link:<span class="m_-1153828080461882838Apple-converted-space"> </span><br>> <a href="https://github.com/apple/swift-evolution/blob/master/proposals/0168-multi-line-string-literals.md" target="_blank">https://github.com/apple/<wbr>swift-evolution/blob/master/<wbr>proposals/0168-multi-line-<wbr>string-literals.md</a><br>><span class="m_-1153828080461882838Apple-converted-space"> </span><br>> Hello Swift Community,<br>><span class="m_-1153828080461882838Apple-converted-space"> </span><br>> The review of SE-0168: "Multi-Line String Literals" ran from April 6...12, 2017. The<span class="m_-1153828080461882838Apple-converted-space"> </span><br>> proposal is *accepted with revisions. *Community feedback was largely positive on the<span class="m_-1153828080461882838Apple-converted-space"> </span><br>> idea, though the discussion highlighted several under-specified aspects.<br>><span class="m_-1153828080461882838Apple-converted-space"> </span><br>> - Questions arose about whether text could appear on the same line as the opening and<span class="m_-1153828080461882838Apple-converted-space"> </span><br>> closing delimiter, and how that would interact with the de-indentation algorithm. The<span class="m_-1153828080461882838Apple-converted-space"> </span><br>> core team feels that it is important to keep this feature focused on its purpose of<span class="m_-1153828080461882838Apple-converted-space"> </span><br>> allowing the easy embedding of pasted blocks of text, so *text inside the literal on<span class="m_-1153828080461882838Apple-converted-space"> </span><br>> the same line as either delimiter should be disallowed.*<br>><span class="m_-1153828080461882838Apple-converted-space"> </span><br>> // Allowed, equal to "foo\nbar"<br>> """<br>> foo<br>> bar<br>> """<br><br>Could you clarify, shouldn't this be equal to "foo\nbar\n" ? I.e. with trailing \n<span class="m_-1153828080461882838Apple-converted-space"> </span><br>for "bar" line?<br>I didn't find any clarification about the injecting of line-end for last text<span class="m_-1153828080461882838Apple-converted-space"> </span><br>line(not for the """ delimiter).<br><br>><span class="m_-1153828080461882838Apple-converted-space"> </span><br>> // Not allowed<br>> """foo<br>> bar<br>> """<br>><span class="m_-1153828080461882838Apple-converted-space"> </span><br>> // Not allowed<br>> """<br>> foo<br>> bar"""<br>><span class="m_-1153828080461882838Apple-converted-space"> </span><br>> This keeps the model straightforward to describe: a *single newline *is always<span class="m_-1153828080461882838Apple-converted-space"> </span><br>> stripped after the opening delimiter and before the closing one, and the closing<span class="m_-1153828080461882838Apple-converted-space"> </span><br>> delimiter's position always determines the indentation level of the entire literal.<span class="m_-1153828080461882838Apple-converted-space"> </span><br>> The core team acknowledges that single-line triple quoted strings have other uses in<span class="m_-1153828080461882838Apple-converted-space"> </span><br>> other languages, such as to avoid excessive escaping in a string that contains lots<span class="m_-1153828080461882838Apple-converted-space"> </span><br>> of literal quotes, but supporting that alongside the indentation-stripping behavior<span class="m_-1153828080461882838Apple-converted-space"> </span><br>> leads to a lot of subtlety, and there could be other solutions to the escaping<span class="m_-1153828080461882838Apple-converted-space"> </span><br>> problem down the line, such as raw strings. If nothing else, single-line triple<span class="m_-1153828080461882838Apple-converted-space"> </span><br>> quoted strings can be considered later as an additive feature.<br>><span class="m_-1153828080461882838Apple-converted-space"> </span><br>> - The core team also believes that *underindentation or inconsistent tab/space usage<span class="m_-1153828080461882838Apple-converted-space"> </span><br>> within the indentation should be an error.* Every line inside the literal must begin<span class="m_-1153828080461882838Apple-converted-space"> </span><br>> with the exact sequence of spaces and tabs that precedes the closing delimiter.<br>><span class="m_-1153828080461882838Apple-converted-space"> </span><br>> """<br>> <tab><space>this is OK<br>> <space><space>this is an error<br>> <space><tab>this is also an error<br>> <tab>under-indenting is an error too<br>> <tab><space><space>but you can go nuts after the indentation all you want<br>> <tab><space><tab>you do you<br>> <tab><space>"""<br>><span class="m_-1153828080461882838Apple-converted-space"> </span><br>> - The quoted string should *normalize newlines* to \n in the value of the literal,<span class="m_-1153828080461882838Apple-converted-space"> </span><br>> regardless of whether the source file uses \n (Unix), \r\n (Windows), or \r (classic<span class="m_-1153828080461882838Apple-converted-space"> </span><br>> Mac) line endings. Likewise, when the compiler strips the initial and final newline<span class="m_-1153828080461882838Apple-converted-space"> </span><br>> from the literal value, it will strip one of any of the \n, \r\n, or \r line-ending<span class="m_-1153828080461882838Apple-converted-space"> </span><br>> sequences from both ends of the literal.<br>><span class="m_-1153828080461882838Apple-converted-space"> </span><br>> // equal to "foo\nfoo\nfoo\nfoo"<br>> """^J<br>> foo^M^J<br>> foo^J<br>> foo^M<br>> foo^M<br>> """<br>><span class="m_-1153828080461882838Apple-converted-space"> </span><br>> - It should be clarified that *multiline strings support the same escapes and<span class="m_-1153828080461882838Apple-converted-space"> </span><br>> interpolations* as single-line strings. This allows a literal """ to be written \""".<span class="m_-1153828080461882838Apple-converted-space"> </span><br>> Discussion on the list raised the idea of allowing a line to end with \ to "escape"<span class="m_-1153828080461882838Apple-converted-space"> </span><br>> the newline and elide it from the value of the literal; the core team had concerns<span class="m_-1153828080461882838Apple-converted-space"> </span><br>> about only allowing that inside multi-line literals and felt that that could also be<span class="m_-1153828080461882838Apple-converted-space"> </span><br>> considered later as an additive feature.<br>><span class="m_-1153828080461882838Apple-converted-space"> </span><br>> Thanks John, Brent, and Tyler for the original proposal, and thanks to everyone who<span class="m_-1153828080461882838Apple-converted-space"> </span><br>> participated in the discussion!<br>><span class="m_-1153828080461882838Apple-converted-space"> </span><br>> -Joe<br>> Review Manager<br>><span 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