125 lines
1.7 KiB
Plaintext
125 lines
1.7 KiB
Plaintext
|
|
||
|
|
:- object(character,
|
||
|
|
implements(characterp),
|
||
|
|
extends(atom)).
|
||
|
|
|
||
|
|
|
||
|
|
:- info([
|
||
|
|
version is 1.0,
|
||
|
|
authors is 'Paulo Moura',
|
||
|
|
date is 2000/7/24,
|
||
|
|
comment is 'Character predicates.']).
|
||
|
|
|
||
|
|
|
||
|
|
is_alpha('_').
|
||
|
|
|
||
|
|
is_alpha(Char) :-
|
||
|
|
is_letter(Char).
|
||
|
|
|
||
|
|
|
||
|
|
is_letter(Char) :-
|
||
|
|
is_lower_case(Char).
|
||
|
|
|
||
|
|
is_letter(Char) :-
|
||
|
|
is_upper_case(Char).
|
||
|
|
|
||
|
|
|
||
|
|
is_alphanumeric(Char) :-
|
||
|
|
is_alpha(Char).
|
||
|
|
|
||
|
|
is_alphanumeric(Char) :-
|
||
|
|
is_dec_digit(Char).
|
||
|
|
|
||
|
|
|
||
|
|
is_bin_digit(0).
|
||
|
|
is_bin_digit(1).
|
||
|
|
|
||
|
|
|
||
|
|
is_octal_digit(Digit) :-
|
||
|
|
Digit @>= 0,
|
||
|
|
Digit @=< 7.
|
||
|
|
|
||
|
|
|
||
|
|
is_dec_digit(Digit) :-
|
||
|
|
Digit @>= 0,
|
||
|
|
Digit @=< 9.
|
||
|
|
|
||
|
|
|
||
|
|
is_hex_digit(Digit) :-
|
||
|
|
Digit @>= 0,
|
||
|
|
Digit @=< 9.
|
||
|
|
|
||
|
|
is_hex_digit(Digit) :-
|
||
|
|
Digit @>= 'A',
|
||
|
|
Digit @=< 'F'.
|
||
|
|
|
||
|
|
is_hex_digit(Digit) :-
|
||
|
|
Digit @>= a,
|
||
|
|
Digit @=< f.
|
||
|
|
|
||
|
|
|
||
|
|
is_lower_case(Char) :-
|
||
|
|
Char @>= a,
|
||
|
|
Char @=< z.
|
||
|
|
|
||
|
|
|
||
|
|
is_upper_case(Char) :-
|
||
|
|
Char @>= 'A',
|
||
|
|
Char @=< 'Z'.
|
||
|
|
|
||
|
|
|
||
|
|
is_vowel(a).
|
||
|
|
is_vowel(e).
|
||
|
|
is_vowel(i).
|
||
|
|
is_vowel(o).
|
||
|
|
is_vowel(u).
|
||
|
|
|
||
|
|
is_vowel('A').
|
||
|
|
is_vowel('E').
|
||
|
|
is_vowel('I').
|
||
|
|
is_vowel('O').
|
||
|
|
is_vowel('U').
|
||
|
|
|
||
|
|
|
||
|
|
is_layout(' ').
|
||
|
|
|
||
|
|
|
||
|
|
lower_upper(a, 'A').
|
||
|
|
lower_upper(b, 'B').
|
||
|
|
lower_upper(c, 'C').
|
||
|
|
lower_upper(d, 'D').
|
||
|
|
lower_upper(e, 'E').
|
||
|
|
lower_upper(f, 'F').
|
||
|
|
lower_upper(g, 'G').
|
||
|
|
lower_upper(h, 'H').
|
||
|
|
lower_upper(i, 'I').
|
||
|
|
lower_upper(j, 'J').
|
||
|
|
lower_upper(k, 'K').
|
||
|
|
lower_upper(l, 'L').
|
||
|
|
lower_upper(m, 'M').
|
||
|
|
lower_upper(n, 'N').
|
||
|
|
lower_upper(o, 'O').
|
||
|
|
lower_upper(p, 'P').
|
||
|
|
lower_upper(q, 'Q').
|
||
|
|
lower_upper(r, 'R').
|
||
|
|
lower_upper(s, 'S').
|
||
|
|
lower_upper(t, 'T').
|
||
|
|
lower_upper(u, 'U').
|
||
|
|
lower_upper(v, 'V').
|
||
|
|
lower_upper(w, 'W').
|
||
|
|
lower_upper(x, 'X').
|
||
|
|
lower_upper(y, 'Y').
|
||
|
|
lower_upper(z, 'Z').
|
||
|
|
|
||
|
|
lower_upper(Char, Char) :-
|
||
|
|
\+ (Char @>= a, Char @=< z),
|
||
|
|
\+ (Char @>= 'A', Char @=< 'Z').
|
||
|
|
|
||
|
|
|
||
|
|
valid(Character) :-
|
||
|
|
atom(Character),
|
||
|
|
atom_length(Character, 1).
|
||
|
|
|
||
|
|
|
||
|
|
:- end_object.
|