Warning: This is the manual of the legacy Guile 2.2 series. You may want to read the manual of the current stable series instead.

6.6.4.3 Creating Character Sets

New character sets are produced with these procedures.

Scheme Procedure: char-set-copy cs

C Function: scm_char_set_copy (cs)

Return a newly allocated character set containing all characters in cs.

Scheme Procedure: char-set chr …

C Function: scm_char_set (chrs)

Return a character set containing all given characters.

Scheme Procedure: list->char-set list [base_cs]

C Function: scm_list_to_char_set (list, base_cs)

Convert the character list list to a character set. If the character set base_cs is given, the character in this set are also included in the result.

Scheme Procedure: list->char-set! list base_cs

C Function: scm_list_to_char_set_x (list, base_cs)

Convert the character list list to a character set. The characters are added to base_cs and base_cs is returned.

Scheme Procedure: string->char-set str [base_cs]

C Function: scm_string_to_char_set (str, base_cs)

Convert the string str to a character set. If the character set base_cs is given, the characters in this set are also included in the result.

Scheme Procedure: string->char-set! str base_cs

C Function: scm_string_to_char_set_x (str, base_cs)

Convert the string str to a character set. The characters from the string are added to base_cs, and base_cs is returned.

Scheme Procedure: char-set-filter pred cs [base_cs]

C Function: scm_char_set_filter (pred, cs, base_cs)

Return a character set containing every character from cs so that it satisfies pred. If provided, the characters from base_cs are added to the result.

Scheme Procedure: char-set-filter! pred cs base_cs

C Function: scm_char_set_filter_x (pred, cs, base_cs)

Return a character set containing every character from cs so that it satisfies pred. The characters are added to base_cs and base_cs is returned.

Scheme Procedure: ucs-range->char-set lower upper [error [base_cs]]

C Function: scm_ucs_range_to_char_set (lower, upper, error, base_cs)

Return a character set containing all characters whose character codes lie in the half-open range [lower,upper).

If error is a true value, an error is signalled if the specified range contains characters which are not contained in the implemented character range. If error is #f, these characters are silently left out of the resulting character set.

The characters in base_cs are added to the result, if given.

Scheme Procedure: ucs-range->char-set! lower upper error base_cs

C Function: scm_ucs_range_to_char_set_x (lower, upper, error, base_cs)

Return a character set containing all characters whose character codes lie in the half-open range [lower,upper).

If error is a true value, an error is signalled if the specified range contains characters which are not contained in the implemented character range. If error is #f, these characters are silently left out of the resulting character set.

The characters are added to base_cs and base_cs is returned.

Scheme Procedure: ->char-set x

C Function: scm_to_char_set (x)

Coerces x into a char-set. x may be a string, character or char-set. A string is converted to the set of its constituent characters; a character is converted to a singleton set; a char-set is returned as-is.