Returns the String representation of any Unicode code-point^†, or nil when code-point is nil.

One of the ways this is useful is because Clojure/Java String literals only support escape sequences (i.e. "\uXXXX") for code points in the basic plane; code points in the supplementary planes must be manually converted into their UTF-16 surrogate pair, and then each UTF-16 code unit in the pair escaped separately (tedious and error prone).

^†a char or int, but int is usually the better choice, because of historical limitations with Java’s char type

Deprecated. Use code-point->string instead.

Returns a String made up of all of the given Unicode code-points^†, or nil when code-points is nil.

^†a sequence of chars or ints, but ints are usually the better choice, because of historical limitations with Java’s char type

Deprecated. Use code-points->string instead.

Is code-point^† a combining character?

^†a char or int, but int is usually the better choice, because of historical limitations with Java’s char type

Returns the number of columns needed to display s (a String), but deviates from POSIX wcswidth behaviour in these ways:

• non-printing characters are considered zero width (instead of causing the entire result to be -1)
• ANSI escape sequences are (by default, but configurable) also considered zero width

For most use cases, this function is more useful than wcswidth, despite not adhering to POSIX.

Returns 0 when s is nil.

Returns the Unicode grapheme clusters (what we tend to think of as “characters”) in s as a sequence of Strings, or nil when s is nil.

Notes:

• Will use ICU4J’s BreakIterator class when available on the classpath, falling back on the JDK’s lower quality BreakIterator class otherwise

Which implementation is in use for finding grapheme clusters? A keyword with one of these values:

• :icu4j
• :jdk

Is code-point^† a non-printing character?

^†a char or int, but int is usually the better choice, because of historical limitations with Java’s char type

Is code-point^† a null character?

^†a char or int, but int is usually the better choice, because of historical limitations with Java’s char type

A regular expression for matching ANSI escape sequences in a larger text. Taken directly from ECMA-48.

Strips all ANSI escape sequences from s (a String). Returns nil if s is nil.

Returns all of the Unicode code points in s (a String), as a sequence of ints, or nil when s is nil.

Deprecated. Use string->code-points instead.

Returns the number of columns needed to represent s (a String). If a non-printing code point occurs in s, -1 is returned (as defined in POSIX).

Returns 0 when s is nil.

Returns the number of columns needed to represent the code-point ^†, based on these rules:

• Printable: 0, 1, or 2
• Null character, or nil: 0
• Non-printing: -1

^†a char or int, but int is usually the better choice, because of historical limitations with Java’s char type

Is code-point^† in the East Asian Wide (W), East Asian Full-width (F), or other wide character (e.g. emoji) category?

^†a char or int, but int is usually the better choice, because of historical limitations with Java’s char type