String literals without having to escape special characters?
Question
Is there a string literal form in Objective-c that does not require escaping special characters? In other words, I'm looking for an equivalent to the Python triple quote.
I'm trying to put some HTML into an NSString , and would like to avoid having to escape the quotes from all the HTML attributes.
4 answers
solution1
3 2012-01-27 16:47:11
In C++11 you can do this. See my answer to a similar question .
For this you require in your case Objective-C++11. It should work though in gcc.
const char * html = R"HTML(
<HTML>
<HEAD>
<TITLE> [Python-Dev] Triple-quoted strings and indentation
</TITLE>
</HEAD>
<BODY BGCOLOR="#ffffff">
blah blah blah
</BODY>
</HTML>
)HTML";
int
main()
{
}
g++ -std=c++0x -o raw_string raw_string.mm at least compiles.
solution2
2 ACCPTED 2012-01-26 20:51:31
There's no equivalent to the triple-quote; string literals must always use escapes for special characters.
Perhaps the best thing to do would be to put your HTML into a file separate from your source, then create the string using -[NSString initWithContentsOfFile:encoding:error:] (or the related initWithContentsOfURL:... ).
solution3
1 2012-01-26 20:42:45
Nope, unfortunately not ... there's some great info on string literals in obj-c here:
http://blog.ablepear.com/2010/07/objective-c-tuesdays-string-literals.html
solution4
0 2017-11-30 07:10:10
For anyone reading this now:
This feature has been implemented since Swift 4. Read more about it here: https://github.com/apple/swift-evolution/blob/master/proposals/0168-multi-line-string-literals.md
You can do:
let author = "Im the author!"
let x = """
<?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>
"""
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