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std.fs.path.extension: different behavior for ending dot

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extension("a.") now returns "." instead of "".

This matches both Python and Node.js standard library behavior as well
as my personal opinion on how this function should be defined.

Apologies for missing this in the code review.
This commit is contained in:
Andrew Kelley 2020-12-11 18:20:57 -07:00
parent 6ab5bebed1
commit d569e37cb5
1 changed files with 13 additions and 17 deletions
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30
lib/std/fs/path.zig
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@ -1197,7 +1197,7 @@ fn testRelativeWindows(from: []const u8, to: []const u8, expected_output: []cons
/// - `"main.zig"` ⇒ `".zig"`
/// - `"src/main.zig"` ⇒ `".zig"`
/// - `".gitignore"` ⇒ `""`
/// - `"keep."` ⇒ `""`
/// - `"keep."` ⇒ `"."`
/// - `"src.keep.me"` ⇒ `".me"`
/// - `"/src/keep.me"` ⇒ `".me"`
/// - `"/src/keep.me/"` ⇒ `".me"`
@ -1205,13 +1205,9 @@ fn testRelativeWindows(from: []const u8, to: []const u8, expected_output: []cons
/// pointer address range of `path`, even if it is length zero.
pub fn extension(path: []const u8) []const u8 {
const filename = basename(path);
return if (std.mem.lastIndexOf(u8, filename, ".")) |index|
if (index == 0 or index == filename.len - 1)
path[path.len..]
else
filename[index..]
else
path[path.len..];
const index = mem.lastIndexOf(u8, filename, ".") orelse return path[path.len..];
if (index == 0) return path[path.len..];
return filename[index..];
}
fn testExtension(path: []const u8, expected: []const u8) void {
@ -1221,39 +1217,39 @@ fn testExtension(path: []const u8, expected: []const u8) void {
test "extension" {
testExtension("", "");
testExtension(".", "");
testExtension("a.", "");
testExtension("abc.", "");
testExtension("a.", ".");
testExtension("abc.", ".");
testExtension(".a", "");
testExtension(".file", "");
testExtension(".gitignore", "");
testExtension("file.ext", ".ext");
testExtension("file.ext.", "");
testExtension("file.ext.", ".");
testExtension("very-long-file.bruh", ".bruh");
testExtension("a.b.c", ".c");
testExtension("a.b.c/", ".c");
testExtension("/", "");
testExtension("/.", "");
testExtension("/a.", "");
testExtension("/abc.", "");
testExtension("/a.", ".");
testExtension("/abc.", ".");
testExtension("/.a", "");
testExtension("/.file", "");
testExtension("/.gitignore", "");
testExtension("/file.ext", ".ext");
testExtension("/file.ext.", "");
testExtension("/file.ext.", ".");
testExtension("/very-long-file.bruh", ".bruh");
testExtension("/a.b.c", ".c");
testExtension("/a.b.c/", ".c");
testExtension("/foo/bar/bam/", "");
testExtension("/foo/bar/bam/.", "");
testExtension("/foo/bar/bam/a.", "");
testExtension("/foo/bar/bam/abc.", "");
testExtension("/foo/bar/bam/a.", ".");
testExtension("/foo/bar/bam/abc.", ".");
testExtension("/foo/bar/bam/.a", "");
testExtension("/foo/bar/bam/.file", "");
testExtension("/foo/bar/bam/.gitignore", "");
testExtension("/foo/bar/bam/file.ext", ".ext");
testExtension("/foo/bar/bam/file.ext.", "");
testExtension("/foo/bar/bam/file.ext.", ".");
testExtension("/foo/bar/bam/very-long-file.bruh", ".bruh");
testExtension("/foo/bar/bam/a.b.c", ".c");
testExtension("/foo/bar/bam/a.b.c/", ".c");