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 | Grammar rule alpha_to_lower//1 |
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:- use_module(library(dcg/basics)).
[semidet]alpha_to_lower(?C)//alpha) and return it as a lowercase
letter. If C is instantiated and the DCG list is already
bound,
C must be lower and matches both a lower and
uppercase letter. If the output list is unbound, its first element is
bound to C. For example:
?- alpha_to_lower(0'a, `AB`, R). R = [66]. ?- alpha_to_lower(C, `AB`, R). C = 97, R = [66]. ?- alpha_to_lower(0'a, L, R). L = [97|R].