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Added predicate for reading a single character

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notoria
2020-04-18 11:49:28 +02:00
committed by Mark Thom
parent f96e694ff8
commit d3a1f11dfe
3 changed files with 37 additions and 2 deletions
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11
src/prolog/lib/builtins.pl
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@@ -47,8 +47,8 @@ user:term_expansion((:- op(Pred, Spec, [Op | OtherOps])), OpResults) :-
current_input/1, current_output/1, current_op/3,
current_predicate/1, current_prolog_flag/2,
expand_goal/2, expand_term/2, fail/0, false/0,
findall/3, findall/4, get_char/1, halt/0,
max_arity/1, number_chars/2, number_codes/2,
findall/3, findall/4, get_char/1, get_single_char/1,
halt/0, max_arity/1, number_chars/2, number_codes/2,
once/1, op/3, read_term/2, repeat/0, retract/1,
set_prolog_flag/2, set_input/1, set_output/1,
setof/3, sub_atom/5, subsumes_term/2,
@@ -933,6 +933,13 @@ get_char(C) :-
; throw(error(type_error(in_character, C), get_char/1))
).
get_single_char(C) :-
( var(C) -> '$get_single_char'(C)
; C == end_of_file -> '$get_single_char'(C)
; atom_length(C, 1) -> '$get_single_char'(C)
; throw(error(type_error(in_character, C), get_char/1))
).
can_be_number(N, PI) :-
( var(N) -> true
; must_be_number(N, PI)