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.

6.25.3 Character Case Mapping

The procedures below provide support for “character case mapping”, i.e., to convert characters or strings to their upper-case or lower-case equivalent. Note that SRFI-13 provides procedures that look similar (see Alphabetic Case Mapping). However, the SRFI-13 procedures are locale-independent. Therefore, they do not take into account specificities of the customs in use in a particular language or region of the world. For instance, while most languages using the Latin alphabet map lower-case letter “i” to upper-case letter “I”, Turkish maps lower-case “i” to “Latin capital letter I with dot above”. The following procedures allow programmers to provide idiomatic character mapping.

Scheme Procedure: char-locale-downcase chr [locale]

C Function: scm_char_locale_upcase (chr, locale)

Return the lowercase character that corresponds to chr according to either locale or the current locale.

Scheme Procedure: char-locale-upcase chr [locale]

C Function: scm_char_locale_downcase (chr, locale)

Return the uppercase character that corresponds to chr according to either locale or the current locale.

Scheme Procedure: char-locale-titlecase chr [locale]

C Function: scm_char_locale_titlecase (chr, locale)

Return the titlecase character that corresponds to chr according to either locale or the current locale.

Scheme Procedure: string-locale-upcase str [locale]

C Function: scm_string_locale_upcase (str, locale)

Return a new string that is the uppercase version of str according to either locale or the current locale.

Scheme Procedure: string-locale-downcase str [locale]

C Function: scm_string_locale_downcase (str, locale)

Return a new string that is the down-case version of str according to either locale or the current locale.

Scheme Procedure: string-locale-titlecase str [locale]

C Function: scm_string_locale_titlecase (str, locale)

Return a new string that is the titlecase version of str according to either locale or the current locale.