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std.mem: add reset to SplitBackwardsIterator and SplitIterator

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r00ster 2022-07-26 13:26:46 +02:00 committed by GitHub
parent 20ea44ef10
commit 1a16b7214d
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1 changed files with 38 additions and 0 deletions
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lib/std/mem.zig
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@ -1779,6 +1779,20 @@ test "split (multibyte)" {
try testing.expect(it16.next() == null);
}
test "split (reset)" {
var it = split(u8, "abc def ghi", " ");
try testing.expect(eql(u8, it.first(), "abc"));
try testing.expect(eql(u8, it.next().?, "def"));
try testing.expect(eql(u8, it.next().?, "ghi"));
it.reset();
try testing.expect(eql(u8, it.first(), "abc"));
try testing.expect(eql(u8, it.next().?, "def"));
try testing.expect(eql(u8, it.next().?, "ghi"));
try testing.expect(it.next() == null);
}
/// Returns an iterator that iterates backwards over the slices of `buffer`
/// that are separated by bytes in `delimiter`.
///
@ -1871,6 +1885,20 @@ test "splitBackwards (multibyte)" {
try testing.expect(it16.next() == null);
}
test "splitBackwards (reset)" {
var it = splitBackwards(u8, "abc def ghi", " ");
try testing.expect(eql(u8, it.first(), "ghi"));
try testing.expect(eql(u8, it.next().?, "def"));
try testing.expect(eql(u8, it.next().?, "abc"));
it.reset();
try testing.expect(eql(u8, it.first(), "ghi"));
try testing.expect(eql(u8, it.next().?, "def"));
try testing.expect(eql(u8, it.next().?, "abc"));
try testing.expect(it.next() == null);
}
pub fn startsWith(comptime T: type, haystack: []const T, needle: []const T) bool {
return if (needle.len > haystack.len) false else eql(T, haystack[0..needle.len], needle);
}
@ -1980,6 +2008,11 @@ pub fn SplitIterator(comptime T: type) type {
const start = self.index orelse end;
return self.buffer[start..end];
}
/// Resets the iterator to the initial slice.
pub fn reset(self: *Self) void {
self.index = 0;
}
};
}
@ -2016,6 +2049,11 @@ pub fn SplitBackwardsIterator(comptime T: type) type {
const end = self.index orelse 0;
return self.buffer[0..end];
}
/// Resets the iterator to the initial slice.
pub fn reset(self: *Self) void {
self.index = self.buffer.len;
}
};
}