Function getNamespacePrefix [src]

If T is u16, then path should be encoded as WTF-16LE.

Prototype

pub fn getNamespacePrefix(comptime T: type, path: []const T) NamespacePrefix

Parameters

T: typepath: []const T

Example

 test getNamespacePrefix {
    try std.testing.expectEqual(NamespacePrefix.none, getNamespacePrefix(u8, ""));
    try std.testing.expectEqual(NamespacePrefix.nt, getNamespacePrefix(u8, "\\??\\"));
    try std.testing.expectEqual(NamespacePrefix.none, getNamespacePrefix(u8, "/??/"));
    try std.testing.expectEqual(NamespacePrefix.none, getNamespacePrefix(u8, "/??\\"));
    try std.testing.expectEqual(NamespacePrefix.none, getNamespacePrefix(u8, "\\?\\\\"));
    try std.testing.expectEqual(NamespacePrefix.local_device, getNamespacePrefix(u8, "\\\\.\\"));
    try std.testing.expectEqual(NamespacePrefix.local_device, getNamespacePrefix(u8, "\\\\./"));
    try std.testing.expectEqual(NamespacePrefix.local_device, getNamespacePrefix(u8, "/\\./"));
    try std.testing.expectEqual(NamespacePrefix.local_device, getNamespacePrefix(u8, "//./"));
    try std.testing.expectEqual(NamespacePrefix.none, getNamespacePrefix(u8, "/.//"));
    try std.testing.expectEqual(NamespacePrefix.verbatim, getNamespacePrefix(u8, "\\\\?\\"));
    try std.testing.expectEqual(NamespacePrefix.fake_verbatim, getNamespacePrefix(u8, "\\/?\\"));
    try std.testing.expectEqual(NamespacePrefix.fake_verbatim, getNamespacePrefix(u8, "\\/?/"));
    try std.testing.expectEqual(NamespacePrefix.fake_verbatim, getNamespacePrefix(u8, "//?/"));
}

Source

  pub fn getNamespacePrefix(comptime T: type, path: []const T) NamespacePrefix {
    if (path.len < 4) return .none;
    var all_backslash = switch (mem.littleToNative(T, path[0])) {
        '\\' => true,
        '/' => false,
        else => return .none,
    };
    all_backslash = all_backslash and switch (mem.littleToNative(T, path[3])) {
        '\\' => true,
        '/' => false,
        else => return .none,
    };
    switch (mem.littleToNative(T, path[1])) {
        '?' => if (mem.littleToNative(T, path[2]) == '?' and all_backslash) return .nt else return .none,
        '\\' => {},
        '/' => all_backslash = false,
        else => return .none,
    }
    return switch (mem.littleToNative(T, path[2])) {
        '?' => if (all_backslash) .verbatim else .fake_verbatim,
        '.' => .local_device,
        else => .none,
    };
}  