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• egg

icu

Select bindings to the ICU unicode library.

Introduction

This library is partially inspired by [https://docs.python.org/3/library/unicodedata.html|Python's unicodedata library]. As it deals with unicode, it also reexports the utf8 egg for ease of use.

Procedures

Names

[procedure] (char-from-name name)

Return char corresponding to string name name. name is passed through string-upcase.

(char-from-name "fire") ;; => #\x1f525
(char-from-name "FIRE") ;; => #\x1f525

[procedure] (char-string-name char)

Returns string name for char.

(char-string-name #\x1f525) ;; => "FIRE"

Decomposition and Normalization

[procedure] (char-decomposition char)

Returns the decomposition mapping of char.

For example, for ¼, VULGAR FRACTION ONE QUARTER:

(char-decomposition #\xBC) ;; => '(#\1 #\x2044 #\4)

[procedure] (string-normalize str [form])

Returns the normalized form of str to the destination string according to form, which can be any of "nfc", "nfkc", "nfd", or "nfkd"

(string-normalize "¼") ;; => "1/4"

Numbers

[procedure] (char-digit-value char)

Binding for u_charDigitValue. Returns the decimal digit value of a decimal digit character.

(char-digit-value #\4) ;; => 4

[procedure] (char-numeric-value char)

Binding for u_getNumericValue. Get the numeric value (as a double) for a Unicode code point as defined in the Unicode Character Database.

(char-numeric-value #\4) ;; => 4.0
(char-numeric-value #\xBC) ;; => .25

[procedure] (char-digit char radix)

Binding for u_digit. Returns the decimal digit value of the code point in the specified radix.

(char-digit #\f 16) ;; => 15

[procedure] (char-for-digit char radix)

Binding for u_forDigit. Determines the character representation for a specific digit in the specified radix.

(char-for-digit 15 16) ;; => #\f

[procedure] (char-digit? char)

Binding for u_isdigit. Determines whether the specified code point is a digit character according to Java.

[procedure] (char-xdigit? char)

Binding for u_isxdigit. Determines whether the specified code point is a hexadecimal digit.