nxt.string_traits source code

1 module nxt.string_traits;
2 
3 @safe pure nothrow @nogc:
4 
5 /** Returns: `true` iff `x` is an ASCII (7-bit clean) set of `char`s.
6  *
7  * See_Also: `std.ascii.isASCII`.
8  * See_Also: https://forum.dlang.org/post/syaqzkpybhvdehbhffjn@forum.dlang.org
9  */
10 bool isASCIIString(scope const(char)[] input)
11 {
12     foreach (e; cast(const(ubyte)[])input) // no decoding to `dchar` needed
13     {
14         if (e >= 0x7F) { return false; }
15     }
16     return true;
17 }
18 
19 ///
20 @safe pure unittest
21 {
22     assert(``.isASCIIString);
23     assert(`_`.isASCIIString);
24     assert(`a`.isASCIIString);
25     assert(`ab`.isASCIIString);
26     assert(`abc`.isASCIIString);
27     assert(!`å`.isASCIIString);
28     assert(!`åä`.isASCIIString);
29     assert(!`åäö`.isASCIIString);
30 }