At quick glance I disagree with (4). If your current string would contain
something like "\n\n" would you really use another empty line with a single
unescaped quote? If you’re not, you’ll end up adding a single \n, but that on
the other than would be strange if you add it at the end of the line.
Multi-lined strings should not be abused for adding new lines to the string
itself, however I’m fine with allowing single quotes without escaping them.
If we’d really go that path then I still could not format some really long
hardcoded text for code readability in a multi lined string, just because of
the fact that it will alter my original string by automatically adding new line
characters.
let veryLongString1 = "word word word … word word word"
let veryLongString2 = """word word word
word word word
…
word word word
word word word"""
// Logically that string should be the same, however during the
// automatic new lines we'll get this
veryLongString1 == veryLongString2 // => false
What has the multi lined string solved here? Nothing.
--
Adrian Zubarev
Sent with Airmail
Am 3. April 2017 um 16:00:53, Ricardo Parada ([email protected]) schrieb:
What is the purpose of that backslash? It does not feel like an improvement.
I think we should focus on:
1. Looking pretty
2. Allow unescaped quote, double quote as well single/double apostrophe
characters
3. Allow interpolation
4. No need to add the \n character for each line
5. It should have a continuation character
6. Keep it simple
Something like this:
let xml = M"<?xml version="1.0"?>
"<catalog>
" <book id="bk101" empty="">
" <author>\(author)</author>
" </book>
"</catalog>
Or maybe this:
let xml = """<?xml version="1.0"?>
"<catalog>
" <book id="bk101" empty="">
" <author>\(author)</author>
" </book>
"</catalog>
In the first example the multiline literal is started with M". In the second
example it starts with three double quotes """. I really have no preference.
In both examples there is no need to have a \ or \n at the end of the line.
You can have quote characters in the string, including double quotes as shown
by empty="". You can have interpolation, i.e. \(author).
You have a continuation character which helps as a visual guide and as a marker
for the beginning of each line.
The multi string literal ends when there are no more continuation characters.
On Apr 3, 2017, at 3:01 AM, Adrian Zubarev via swift-evolution
<[email protected]> wrote:
Hello Swift community,
on Github there is a PR for this proposal, but I couldn’t find any up to date
thread, so I’m going to start by replying to the last message I found, without
the last content.
I really like where this proposal is going, and my personal preference are
*continuation quotes*. However the proposed solution is still not perfect
enough for me, because it still lacks of precise control about the trailing
space characters in each line of a multi-line string.
Proposed version looks like this:
let xml = "<?xml version=\"1.0\"?>
"<catalog>
" <book id=\"bk101\" empty=\"\">
" <author>\(author)</author>
" <title>XML Developer's Guide</title>
" <genre>Computer</genre>
" <price>44.95</price>
" <publish_date>2000-10-01</publish_date>
" <description>An in-depth look at creating applications with
XML.</description>
" </book>
"</catalog>
""
I would like to pitch an enhancement to fix the last tiny part by adding the
escaping character ‘' to the end of each line from 1 to (n - 1) of the n-lined
string. This is similar to what Javascript allows us to do, except that we also
have precise control about the leading space character through ’"’.
The proposed version will become this:
let xml = "<?xml version=\"1.0\"?>\
"<catalog>\ // If you need you can comment here
" <book id=\"bk101\" empty=\"\">\
" <author>\(author)</author>\
" <title>XML Developer's Guide</title>\
" <genre>Computer</genre>\
" <price>44.95</price>\
" <publish_date>2000-10-01</publish_date>\
" <description>An in-depth look at creating applications with
XML.</description>\
" </book>\
"</catalog>\
""
Here is another example:
let multilineString: String = "123__456__\ // indicates there is another part
of the string on the next line
"__789_____\ // aways starts with `"` and ends
with either `\` or `"`
"_____0_" // precise control about pre- and
post-space-characters
let otherString = "\(someInstance)\ /* only comments are allowed in between */
"text \(someOtherInstance) text"
This is simply continuation quotes combined with backslash concatenation.
--
Adrian Zubarev
Sent with Airmail
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