Module Quickjs.Unicode

Unicode normalization forms

normalize form str normalizes a UTF-8 string to the specified form. Returns None on memory allocation failure or invalid input.

Example:

  normalize NFC "café" (* composed form *) normalize NFD
    "café" (* decomposed form *)

lowercase str converts a UTF-8 string to lowercase. Handles Unicode characters like "ÉCOLE" → "école".

uppercase str converts a UTF-8 string to uppercase. Handles special cases like "ß" → "SS".

lowercase_char c returns the lowercase form of a code point. Returns a list because some characters expand (though lowercase rarely does).

uppercase_char c returns the uppercase form of a code point. Returns a list because some characters expand, e.g., 'ß' → 'S'; 'S'.

is_cased c returns true if the character has uppercase/lowercase forms. Examples: 'a', 'A', 'é' are cased; '1', '!' are not.

is_case_ignorable c returns true if the character is ignored during case mapping operations (e.g., combining marks).

is_id_start c returns true if the character can start a JavaScript/Unicode identifier (letters, $, _).

is_id_continue c returns true if the character can continue a JavaScript/Unicode identifier (letters, digits, $, _, combining marks).

is_whitespace c returns true if the character is Unicode whitespace. Includes ASCII space, tab, newline, and Unicode spaces like U+00A0 (NBSP).

canonicalize ?unicode c returns the canonical form of a character for case-insensitive regex matching.

• unicode: if true (default), use full Unicode case folding; if false, only ASCII case folding.