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.send { color:#77bb77; }
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.error { color:#AA0000; }</style></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div class="bloop_markdown"><p>Actually this would be inconsistent. The lines in between the delimiters should always add an implicit new line if not told otherwise with a backslash. If that wouldn’t be the case than you won’t have any precision in the last line you have there.</p>
<p>Assume you want to concatenate this string:</p>
<pre><code class="swift">foo
bar baz
</code></pre>
<p>To do so you’d need extra spaces in your <code>" baz"</code> string, because of the inconsistency. However the constant version I’m suggesting is more precise.</p>
<pre><code class="swift">let myString = """
foo
bar \
"""
print(myString + "baz")
</code></pre>
<p>The last implicit new line which one would need to escape is a model artifact, but it’s consistent that way.</p>
<p>The extra new line one would ever need to add manually would be only at the top of a multi-line string.</p>
<pre><code class="swift">// v1:
"""
foo
bar\
"""
// v2:
"""
\n\
foo
bar\
"""
// v3:
"""
\nfoo
bar\
"""
</code></pre>
<p></p></div><div class="bloop_original_html"><style>body{font-family:Helvetica,Arial;font-size:13px}</style><div id="bloop_customfont" style="font-family:Helvetica,Arial;font-size:13px; color: rgba(0,0,0,1.0); margin: 0px; line-height: auto;"><br></div> <br> <div id="bloop_sign_1492019016117445888" class="bloop_sign"><div style="font-family:helvetica,arial;font-size:13px">-- <br>Adrian Zubarev<br>Sent with Airmail</div></div> <br><p class="airmail_on">Am 12. April 2017 um 19:41:14, Ricardo Parada via swift-evolution (<a href="mailto:swift-evolution@swift.org">swift-evolution@swift.org</a>) schrieb:</p> <blockquote type="cite" class="clean_bq"><span><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div></div><div>
<title></title>
Hi all,
<div class=""><br class=""></div>
<div class="">I agree as well, I think we should make optimize for
the most common case of multi-line strings. A rule that says
strip the first leading newline as well as the trailing newline.
So it's almost back to where Brent started with the addition
of removing the trailing newline.
<div class=""><br class=""></div>
<div class="">Borrowing Adrian's example, I could just have this:
<div class="">
<pre style="margin-top: 15px; margin-bottom: 15px; 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); border: 1px solid rgb(204, 204, 204); overflow: auto; padding: 4px 8px; word-break: normal; word-wrap: normal;" class=""><code class="swift" 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; color: inherit; border: 0px; margin: 0px; padding: 0px; word-break: normal; word-wrap: normal; -webkit-margin-before: 0px;">
let myReallyLongXMLConstantName = """
<?xml version="1.0"?>
<catalog>
<book id="bk101" empty="">
<author>John Doe</author>
<title>XML Developer's Guide</title>
<genre>Computer</genre>
<price>44.95</price>
</book>
</catalog>
""" </code></pre>
<div class="">If somebody wants the last line to include a newline
at the end, they can just add a <font face="Monaco" style="font-size: 12px;" class="">\n</font> at the end or an empty
line.</div>
<div class=""><br class=""></div>
<div class="">So if I do this:</div>
<div class="">
<pre style="margin-top: 15px; margin-bottom: 15px; 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); border: 1px solid rgb(204, 204, 204); overflow: auto; padding: 4px 8px; word-break: normal; word-wrap: normal;" class=""><code class="swift" 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; color: inherit; border: 0px; margin: 0px; padding: 0px; word-break: normal; word-wrap: normal; -webkit-margin-before: 0px;">print(myReallyLongXMLConstantName)
print("Text right below")</code></pre>
<div class="">It would output this:</div>
</div>
<div class=""><br class=""></div>
<div class=""><font face="Monaco" style="font-size: 12px;" class=""> <?xml version="1.0"?></font></div>
<div class="">
<div class=""><font face="Monaco" style="font-size: 12px;" class=""> <catalog></font></div>
<div class=""><font face="Monaco" style="font-size: 12px;" class=""> <book id="bk101"
empty=""></font></div>
<div class=""><font face="Monaco" style="font-size: 12px;" class=""> <author>John
Doe</author></font></div>
<div class=""><font face="Monaco" style="font-size: 12px;" class=""> <title>XML Developer's
Guide</title></font></div>
<div class=""><font face="Monaco" style="font-size: 12px;" class="">
<genre>Computer</genre></font></div>
<div class=""><font face="Monaco" style="font-size: 12px;" class="">
<price>44.95</price></font></div>
<div class=""><font face="Monaco" style="font-size: 12px;" class=""> </book></font></div>
<div class=""><font face="Monaco" style="font-size: 12px;" class=""> </catalog></font></div>
</div>
<div class=""><font face="Monaco" style="font-size: 12px;" class="">Test right below</font></div>
<div class=""><br class=""></div>
<div class="">Without removing the trailing newline then it would
print like this:</div>
<div class=""><br class=""></div>
<div class="">
<div class=""><font face="Monaco" style="font-size: 12px;" class=""> <?xml version="1.0"?></font></div>
<div class="">
<div class=""><font face="Monaco" style="font-size: 12px;" class=""> <catalog></font></div>
<div class=""><font face="Monaco" style="font-size: 12px;" class=""> <book id="bk101"
empty=""></font></div>
<div class=""><font face="Monaco" style="font-size: 12px;" class=""> <author>John
Doe</author></font></div>
<div class=""><font face="Monaco" style="font-size: 12px;" class=""> <title>XML Developer's
Guide</title></font></div>
<div class=""><font face="Monaco" style="font-size: 12px;" class="">
<genre>Computer</genre></font></div>
<div class=""><font face="Monaco" style="font-size: 12px;" class="">
<price>44.95</price></font></div>
<div class=""><font face="Monaco" style="font-size: 12px;" class=""> </book></font></div>
<div class=""><font face="Monaco" style="font-size: 12px;" class=""> </catalog></font></div>
</div>
<div class=""><font face="Monaco" style="font-size: 12px;" class=""><br class=""></font></div>
<div class="">
<div class=""><font face="Monaco" style="font-size: 12px;" class="">Test right below</font></div>
</div>
</div>
<div class=""><font face="Monaco" style="font-size: 12px;" class=""><br class=""></font></div>
<div class=""><br class=""></div>
<div class=""><br class=""></div>
<div class=""><br class="">
<div>
<blockquote type="cite" class="">
<div class="">On Apr 12, 2017, at 12:48 PM, Xiaodi Wu via
swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:</div>
<br class="Apple-interchange-newline">
<div class="">Agree. I prefer the new rules over the old, but
considering common use cases, stripping the leading and trailing
newline makes for a more pleasant experience than not stripping
either of them.<br class="">
<br class="">
I think that is generally worth prioritizing over a simpler
algorithm or even accommodating more styles. Moreover, a user who
wants a trailing or leading newline merely types an extra one if
there is newline stripping, so no use cases are made difficult,
only a very common one is made more ergonomic.<br class="">
<div class="gmail_quote">
<div dir="ltr" class="">On Wed, Apr 12, 2017 at 09:52 Thorsten
Seitz via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:<br class=""></div>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
> Am 12.04.2017 um 15:40 schrieb Brent Royal-Gordon via
swift-evolution <<a href="mailto:swift-evolution@swift.org" class="gmail_msg" target="_blank">swift-evolution@swift.org</a>>:<br class="gmail_msg">
><br class="gmail_msg">
> Hey folks,<br class="gmail_msg">
><br class="gmail_msg">
><br class="gmail_msg">
> We've revised the proposal again. The main difference: You no
longer need an initial newline to enable indentation stripping, and
stripping no longer removes that newline even if it is present.
(Adrian Zubarev and I believe some others argued for this.)
We<br class="gmail_msg">
<br class="gmail_msg">
Hmm, not sure if I like these changes. I expect that almost all
strings won't begin with a newline and a majority won’t end with a
newline. The new design would require a leading backslash almost
all the time and a trailing backslash often, which is
ugly:<br class="gmail_msg">
<br class="gmail_msg">
let mystring = "““\<br class="gmail_msg">
text text<br class="gmail_msg">
text text\<br class="gmail_msg">
"““<br class="gmail_msg">
<br class="gmail_msg">
-Thorsten<br class="gmail_msg">
<br class="gmail_msg">
<br class="gmail_msg">
> disagreed with this at first, but it made more sense as we
thought about it more. There are a few things we like about
it:<br class="gmail_msg">
><br class="gmail_msg">
> 1. The rules and algorithm are
simpler.<br class="gmail_msg">
> 2. It accommodates more coding
styles.<br class="gmail_msg">
> 3. Every non-escaped newline in the
literal now creates a corresponding newline in the resulting
string.<br class="gmail_msg">
> 4. it's easy to get the old behavior
back by backslashing the leading newline.<br class="gmail_msg">
><br class="gmail_msg">
> Unfortunately, I think this precludes stripping the trailing
newline by default, but I think this is ultimately a simpler and
better approach than the previous draft.<br class="gmail_msg">
><br class="gmail_msg">
> Other changes:<br class="gmail_msg">
><br class="gmail_msg">
> * We realized we needed to make
closing delimiter matching a little more complicated if we wanted
to allow one or two adjacent double-quote characters that were part
of the literal's contents. Oops.<br class="gmail_msg">
> * Tabs aren't actually allowed in
ordinary string literals, so we now explicitly mention that as a
difference between the two types.<br class="gmail_msg">
> * We wrote some tests for the
prototype (though they haven't been updated for this new version
yet).<br class="gmail_msg">
> * There were some other wording
changes, particularly in the indentation stripping rationale, but
nothing that affects the actual design.<br class="gmail_msg">
><br class="gmail_msg">
> I understand John is working on a new version of his toolchain
so people can play with the prototype. We hope to have that ready
for you all soon.<br class="gmail_msg">
><br class="gmail_msg">
> Let us know what you think of the revisions!<br class="gmail_msg">
><br class="gmail_msg">
> --<br class="gmail_msg">
> Brent Royal-Gordon<br class="gmail_msg">
> Architechies<br class="gmail_msg">
><br class="gmail_msg">
> _______________________________________________<br class="gmail_msg">
> swift-evolution mailing list<br class="gmail_msg">
> <a href="mailto:swift-evolution@swift.org" class="gmail_msg" target="_blank">swift-evolution@swift.org</a><br class="gmail_msg">
> <a href="https://lists.swift.org/mailman/listinfo/swift-evolution" rel="noreferrer" class="gmail_msg" target="_blank">https://lists.swift.org/mailman/listinfo/swift-evolution</a><br class="gmail_msg">
<br class="gmail_msg">
_______________________________________________<br class="gmail_msg">
swift-evolution mailing list<br class="gmail_msg">
<a href="mailto:swift-evolution@swift.org" class="gmail_msg" target="_blank">swift-evolution@swift.org</a><br class="gmail_msg">
<a href="https://lists.swift.org/mailman/listinfo/swift-evolution" rel="noreferrer" class="gmail_msg" target="_blank">https://lists.swift.org/mailman/listinfo/swift-evolution</a><br class="gmail_msg">
</blockquote>
</div>
_______________________________________________<br class="">
swift-evolution mailing list<br class="">
<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a><br class="">
https://lists.swift.org/mailman/listinfo/swift-evolution<br class=""></div>
</blockquote>
</div>
<br class=""></div>
</div>
</div>
</div>
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