[Issue 8181] New: String splitting with nonempty delim produces empty result
d-bugmail at puremagic.com
d-bugmail at puremagic.com
Fri Jun 1 13:49:45 PDT 2012
http://d.puremagic.com/issues/show_bug.cgi?id=8181
Summary: String splitting with nonempty delim produces empty
result
Product: D
Version: D2
Platform: x86
OS/Version: Windows
Status: NEW
Severity: normal
Priority: P2
Component: Phobos
AssignedTo: nobody at puremagic.com
ReportedBy: bearophile_hugs at eml.cc
--- Comment #0 from bearophile_hugs at eml.cc 2012-06-01 13:51:37 PDT ---
Splitting of an empty string according to another nonempty delim string
produces an empty array result:
import std.stdio, std.string;
void main() {
writeln("".split("."));
}
Output:
[]
While in Python2 it produces a list (array) that contains an empty string:
>>> "".split()
[]
>>> "".split(".")
['']
In most cases such Python string methods are carefully designed.
That Python behavour is useful:
>>> file_name = "ball.jpg"
>>> file_name.split(".")[-1] == "jpg"
True
>>> file_name = ""
>>> file_name.split(".")[-1] == "jpg"
False
While in D:
import std.stdio, std.string;
void main() {
auto file_name = "ball.jpg";
writeln(file_name.split(".")[$-1] == "jpg"); // Output: true
file_name = "";
writeln(file_name.split(".")[$-1] == "jpg"); // range violation
}
Workaround:
import std.stdio, std.array;
void main() {
auto file_name = "";
writeln(!file_name.empty && file_name.split(".")[$-1] == "jpg");
}
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