std::unicode

Status: experimental

Unicode general-category predicates, casing, normalization, and segmentation.

API details and source

The implementation source contains the complete declarations and implementation notes. The table below lists canonical Gossamer call signatures; every item name links directly to its implementation file.

Item	Canonical signature or declaration	Description
combining_class	fn combining_class(rune: char) -> i64	Canonical combining class (0-254) for r.
fold_case	fn fold_case(text: String) -> String	Simple case-folded comparison form for a string.
grapheme_count	fn grapheme_count(text: String) -> i64	Number of UAX #29 grapheme clusters in a string.
graphemes	fn graphemes(text: String) -> Vec<String>	UAX #29 extended grapheme clusters of a string.
is_assigned	fn is_assigned(rune: char) -> bool	True if r is an assigned code point (not Cn).
is_control	fn is_control(rune: char) -> bool	True if r is category Cc.
is_digit	fn is_digit(rune: char) -> bool	True if r is a decimal digit (category Nd).
is_graphic	fn is_graphic(rune: char) -> bool	True if r is graphic (printable and not whitespace).
is_letter	fn is_letter(rune: char) -> bool	True if r is in general-category group L.
is_lower	fn is_lower(rune: char) -> bool	True if r is category Ll.
is_mark	fn is_mark(rune: char) -> bool	True if r is in general-category group M.
is_nfc	fn is_nfc(text: String) -> bool	True if a string is already in NFC.
is_nfd	fn is_nfd(text: String) -> bool	True if a string is already in NFD.
is_nfkc	fn is_nfkc(text: String) -> bool	True if a string is already in NFKC.
is_nfkd	fn is_nfkd(text: String) -> bool	True if a string is already in NFKD.
is_number	fn is_number(rune: char) -> bool	True if r is any numeric (Nd|Nl|No).
is_print	fn is_print(rune: char) -> bool	True if r is printable (not Cc/Cf/Cs/Co/Cn).
is_punct	fn is_punct(rune: char) -> bool	True if r is in general-category group P.
is_space	fn is_space(rune: char) -> bool	True if r is whitespace (Z* plus HT/LF/VT/FF/CR/NEL).
is_symbol	fn is_symbol(rune: char) -> bool	True if r is in general-category group S.
is_title	fn is_title(rune: char) -> bool	True if r is category Lt.
is_upper	fn is_upper(rune: char) -> bool	True if r is category Lu.
nfc	fn nfc(text: String) -> String	Normalize a string to NFC (canonical composition).
nfd	fn nfd(text: String) -> String	Normalize a string to NFD (canonical decomposition).
nfkc	fn nfkc(text: String) -> String	Normalize a string to NFKC (compat composition).
nfkd	fn nfkd(text: String) -> String	Normalize a string to NFKD (compat decomposition).
sentence_count	fn sentence_count(text: String) -> i64	Number of UAX #29 sentences in a string.
sentences	fn sentences(text: String) -> Vec<String>	UAX #29 Unicode sentences in a string.
simple_fold	fn simple_fold(rune: char) -> char	Next rune in Unicode case-folding cycle.
to_lower	fn to_lower(rune: char) -> char	Simple lowercase mapping for one rune.
to_lower_str	fn to_lower_str(text: String) -> String	Full lowercase mapping for a string.
to_title	fn to_title(rune: char) -> char	Simple titlecase mapping for one rune.
to_upper	fn to_upper(rune: char) -> char	Simple uppercase mapping for one rune.
to_upper_str	fn to_upper_str(text: String) -> String	Full uppercase mapping for a string (ss -> SS).
word_bounds	fn word_bounds(text: String) -> Vec<(i64, i64)>	UAX #29 word boundaries (includes punct + whitespace runs).
word_count	fn word_count(text: String) -> i64	Number of UAX #29 words in a string.
words	fn words(text: String) -> Vec<String>	UAX #29 Unicode words in a string (skips punct/whitespace).