char-ci=?, char-ci<?, char-ci>?, char-ci<=?, char-ci>=? - case-folded comparison
LIBRARY
(import (rnrs)) ;R6RS
(import (rnrs unicode)) ;R6RS
(import (scheme r5rs)) ;R7RS
(import (scheme char)) ;R7RS
SYNOPSIS
(char-ci=? char char char ...)
(char-ci<? char char char ...)
(char-ci>? char char char ...)
(char-ci<=? char char char ...)
(char-ci>=? char char char ...)
DESCRIPTION
These procedures are similar to char=?, etc., but operate
on the case-folded versions of the characters.
The -ci mnemonic stands for "case insensitive".
RETURN VALUES
Returns a single boolean value.
EXAMPLES
(char-ci<? #\z #\Z) => #f
(char-ci=? #\z #\Z) => #t
(char-ci=? #\ς #\σ) => #t ;not required by R7RS
COMPATIBILITY
These procedures are defined in terms of
char-foldcase(3scm).
Whatever
compatibility concerns apply to that procedure also apply here, in addition
to any concerns applicable to char<? etc.
These procedures exist in R5RS and earlier reports, but they were only
required to support two arguments.
IEEE Scheme uses the ≤ and ≥ characters instead of <= and >= in the
procedure entries, but this is probably a typo.
ERRORS
This procedure can raise exceptions with the following condition types:
- &assertion (R6RS)
-
The wrong number of arguments was passed or an argument was outside its domain.
- R7RS
-
The assertions described above are errors.
Implementations may signal an error, extend the procedure's
domain of definition to include such arguments,
or fail catastrophically.
SEE ALSO
char=?(3scm),
char-foldcase(3scm)
STANDARDS
R4RS,
IEEE Scheme,
R5RS,
R6RS,
R7RS
AUTHORS
This page is part of the
scheme-manpages
project.
It includes materials from the RnRS documents.
More information can be found at
https://github.com/schemedoc/manpages/
.
Markup created by unroff 1.0sc, March 04, 2023.