impl AsciiDenyList

const fn new(deny_glyphless: bool, deny_list: &str) -> Self

Computes (preferably at compile time) an ASCII deny list.

Setting deny_glyphless to true denies U+0020 SPACE and below as well as U+007F DELETE for convenience without having to list these characters in the deny_list string.

deny_list is the list of ASCII characters to deny. This list must not contain any of:

• Letters
• Digits
• Hyphen
• Dot (period / full-stop)
• Non-ASCII

Panics

If the deny list contains characters listed as prohibited above.

const EMPTY: Self = _;

No ASCII deny list. This corresponds to UseSTD3ASCIIRules=false.

Equivalent to AsciiDenyList::new(false, "").

Note: Not denying the space and control characters can result in strange behavior. Without a deny list provided to the UTS 46 operation, the caller is expected perform filtering afterwards, but it's more efficient to use AsciiDenyList than post-processing, because the internals of this crate can optimize away checks in certain cases.

const STD3: Self = _;

The STD3 deny list. This corresponds to UseSTD3ASCIIRules=true.

Note that this deny list rejects the underscore, which occurs in pseudo-hosts used by various TXT record-based protocols, and also characters that may occurs in non-DNS naming, such as NetBIOS.

const URL: Self = _;

Forbidden domain code point from the WHATWG URL Standard.

Equivalent to AsciiDenyList::new(true, "%#/:<>?@[\\]^|").

Note that this deny list rejects IPv6 addresses, so (as in URL parsing) you need to check for IPv6 addresses first and not put them through UTS 46 processing.