40619c8184
This is especially important because a few of our names diverge from ctype(3), and we better inform programmers when the type they are using is not available at all.
143 lines
4.3 KiB
Prolog
143 lines
4.3 KiB
Prolog
:- module(charsio, [char_type/2, get_single_char/1,
|
|
read_term_from_chars/2,
|
|
write_term_to_chars/3]).
|
|
|
|
:- use_module(library(iso_ext)).
|
|
|
|
|
|
fabricate_var_name(VarType, VarName, N) :-
|
|
char_code('A', AC),
|
|
LN is N mod 26 + AC,
|
|
char_code(LC, LN),
|
|
NN is N // 26,
|
|
( NN =:= 0 ->
|
|
( VarType == fabricated ->
|
|
atom_chars(VarName, ['_', LC])
|
|
; VarType == numbervars ->
|
|
atom_chars(VarName, [LC])
|
|
)
|
|
; number_chars(NN, NNChars),
|
|
( VarType == fabricated ->
|
|
atom_chars(VarName, ['_', LC | NNChars])
|
|
; VarType == numbervars ->
|
|
atom_chars(VarName, [LC | NNChars])
|
|
)
|
|
).
|
|
|
|
var_list_contains_name([VarName = _ | VarList], VarName0) :-
|
|
( VarName == VarName0 -> true
|
|
; var_list_contains_name(VarList, VarName0)
|
|
).
|
|
|
|
var_list_contains_variable([_ = Var | VarList], Var0) :-
|
|
( Var == Var0 -> true
|
|
; var_list_contains_variable(VarList, Var0)
|
|
).
|
|
|
|
make_new_var_name(VarType, V, VarName, N, N1, VarList) :-
|
|
fabricate_var_name(VarType, VarName0, N),
|
|
( var_list_contains_name(VarList, VarName0) ->
|
|
N0 is N + 1,
|
|
make_new_var_name(VarType, V, VarName, N0, N1, VarList)
|
|
; VarName = VarName0,
|
|
N1 is N + 1
|
|
).
|
|
|
|
extend_var_list(Value, VarList, NewVarList, VarType) :-
|
|
term_variables(Value, Vars),
|
|
extend_var_list_(Vars, 0, VarList, NewVarList, VarType).
|
|
|
|
extend_var_list_([], _, VarList, VarList, _).
|
|
extend_var_list_([V|Vs], N, VarList, NewVarList, VarType) :-
|
|
( var_list_contains_variable(VarList, V) ->
|
|
extend_var_list_(Vs, N, VarList, NewVarList, VarType)
|
|
; make_new_var_name(VarType, V, VarName, N, N1, VarList),
|
|
NewVarList = [VarName = V | NewVarList0],
|
|
extend_var_list_(Vs, N1, VarList, NewVarList0, VarType)
|
|
).
|
|
|
|
|
|
char_type(Char, Type) :-
|
|
( var(Char) -> throw(error(instantiation_error, char_type/2))
|
|
; atom_length(Char, 1) ->
|
|
( ground(Type) ->
|
|
( ctype(Type) ->
|
|
'$char_type'(Char, Type)
|
|
; throw(error(domain_error(char_type, Type), char_type/2))
|
|
)
|
|
; ctype(Type),
|
|
'$char_type'(Char, Type)
|
|
)
|
|
; throw(error(type_error(in_character, Char), char_type/2))
|
|
).
|
|
|
|
|
|
ctype(alnum).
|
|
ctype(alpha).
|
|
ctype(alphabetic).
|
|
ctype(ascii).
|
|
ctype(ascii_graphic).
|
|
ctype(ascii_punctuation).
|
|
ctype(binary_digit).
|
|
ctype(control).
|
|
ctype(decimal_digit).
|
|
ctype(exponent).
|
|
ctype(graphic).
|
|
ctype(hexadecimal_digit).
|
|
ctype(layout).
|
|
ctype(lower).
|
|
ctype(meta).
|
|
ctype(numeric).
|
|
ctype(octal_digit).
|
|
ctype(prolog).
|
|
ctype(sign).
|
|
ctype(solo).
|
|
ctype(symbolic_control).
|
|
ctype(symbolic_hexadecimal).
|
|
ctype(upper).
|
|
ctype(whitespace).
|
|
|
|
|
|
get_single_char(C) :-
|
|
( var(C) -> '$get_single_char'(C)
|
|
; atom_length(C, 1) -> '$get_single_char'(C)
|
|
; throw(error(type_error(in_character, C), get_single_char/1))
|
|
).
|
|
|
|
|
|
read_term_from_chars(Chars, Term) :-
|
|
( var(Chars) ->
|
|
throw(error(instantiation_error, read_term_from_chars/2))
|
|
; nonvar(Term) ->
|
|
throw(error(uninstantiation_error(Term), read_term_from_chars/2))
|
|
; '$skip_max_list'(_, -1, Chars, Chars0),
|
|
Chars0 == [],
|
|
partial_string(Chars) ->
|
|
true
|
|
;
|
|
throw(error(type_error(complete_string, Chars), read_term_from_chars/2))
|
|
),
|
|
'$read_term_from_chars'(Chars, Term).
|
|
|
|
|
|
write_term_to_chars(_, Options, _) :-
|
|
var(Options), throw(error(instantiation_error, write_term_to_chars/3)).
|
|
write_term_to_chars(Term, Options, Chars) :-
|
|
'$skip_max_list'(_, -1, Options, Options0),
|
|
( var(Options0) ->
|
|
throw(error(instantiation_error, write_term_to_chars/3))
|
|
; nonvar(Chars) ->
|
|
throw(error(uninstantiation_error(Chars), write_term_to_chars/3))
|
|
; Options0 == [] ->
|
|
true
|
|
;
|
|
throw(error(type_error(list, Options), write_term_to_chars/3))
|
|
),
|
|
builtins:inst_member_or(Options, ignore_ops(IgnoreOps), ignore_ops(false)),
|
|
builtins:inst_member_or(Options, numbervars(NumberVars), numbervars(false)),
|
|
builtins:inst_member_or(Options, quoted(Quoted), quoted(false)),
|
|
builtins:inst_member_or(Options, variable_names(VarNames), variable_names([])),
|
|
builtins:inst_member_or(Options, max_depth(MaxDepth), max_depth(0)),
|
|
extend_var_list(Term, VarNames, NewVarNames, numbervars),
|
|
'$write_term_to_chars'(Term, IgnoreOps, NumberVars, Quoted, NewVarNames, MaxDepth, Chars).
|