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std.mem: introduce chompPrefix and chompSuffix

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Andrew Kelley 2025-09-24 16:42:23 -07:00
parent a73f246b29
commit ac4d79e322
1 changed files with 20 additions and 0 deletions
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lib/std/mem.zig
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@ -3079,6 +3079,26 @@ test endsWith {
try testing.expect(!endsWith(u8, "Bob", "Bo"));
}
/// If `slice` starts with `prefix`, returns the rest of `slice` starting at `prefix.len`.
pub fn chompPrefix(comptime T: type, slice: []const T, prefix: []const T) ?[]const T {
return if (startsWith(T, slice, prefix)) slice[prefix.len..] else null;
}
test chompPrefix {
try testing.expectEqualStrings("foo", chompPrefix(u8, "--example=foo", "--example=").?);
try testing.expectEqual(null, chompPrefix(u8, "--example=foo", "-example="));
}
/// If `slice` ends with `suffix`, returns `slice` from beginning to start of `suffix`.
pub fn chompSuffix(comptime T: type, slice: []const T, suffix: []const T) ?[]const T {
return if (endsWith(T, slice, suffix)) slice[0 .. slice.len - suffix.len] else null;
}
test chompSuffix {
try testing.expectEqualStrings("foo", chompSuffix(u8, "foobar", "bar").?);
try testing.expectEqual(null, chompSuffix(u8, "foobar", "baz"));
}
/// Delimiter type for tokenization and splitting operations.
pub const DelimiterType = enum { sequence, any, scalar };