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sparql_runtime.pl
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sparql_runtime.pl
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/* Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: J.Wielemaker@vu.nl
WWW: http://www.swi-prolog.org
Copyright (c) 2010-2018, University of Amsterdam
VU University Amsterdam
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
:- module(sparql_runtime,
[ sparql_true/1, % +Expression
sparql_eval/2, % +Expression, -Value
sparql_eval_raw/2, % +Expression, -Value
sparql_simplify/2, % :Goal, -SimpleGoal
sparql_subquery/3, % +Proj, +Query, +Sols
sparql_update/1, % +UpdateRequest
sparql_find/5, % ?From, ?To, ?F, ?T, :Q
sparql_minus/2, % :Pattern1, :Pattern2
sparql_group/1, % :Query
sparql_group/3, % :Query, +OuterVars, +InnerVars
sparql_service/5, % +Silent, +URL, +Prefixes, +Vars, +QText
sparql_reset_bnodes/0
]).
:- use_module(library(semweb/rdf_db)).
:- use_module(library(semweb/rdf11), [rdf_lexical_form/2]).
:- use_module(library(xsdp_types)).
:- use_module(library(lists)).
:- use_module(library(apply)).
:- use_module(library(assoc)).
:- use_module(library(ordsets)).
:- use_module(library(uri)).
:- use_module(library(dcg/basics)).
:- use_module(library(semweb/sparql_client)).
:- use_module(library(debug)).
:- use_module(library(error)).
:- if(exists_source(library(uuid))).
:- use_module(library(uuid)).
:- endif.
:- discontiguous
term_expansion/2.
:- meta_predicate
sparql_find(?, ?, ?, ?, 0),
sparql_minus(0, 0),
sparql_group(0),
sparql_group(0, +, +),
sparql_subquery(+, 0, +),
sparql_update(:).
/** <module> SPARQL runtime support
@see rdfql_runtime.pl merges this module with generic predicates as well
as runtime libraries for other query languages.
@see These routines are part of the _entailment_ modules. See
../entailment/README.txt
*/
:- thread_local
bnode_store/2.
%! sparql_true(+Term)
%
% Generated from FILTER Term, where Term must be converted to a
% boolean as 'Effective Boolean Value'.
sparql_true(Term) :-
typed_eval(boolean, Term, Result),
!,
true(Result).
true(boolean(true)).
%! eval(+Term, -Result)
eval(Var, unbound(Var)) :-
var(Var),
!.
eval(literal(Literal), Result) :-
!,
eval_literal(Literal, Result).
eval(Atom, iri(Atom)) :-
atom(Atom),
!.
eval(built_in(Term), Result) :-
!,
op(Term, Result).
eval(Term, Result) :-
sparql_op(Term),
!,
op(Term, Result).
eval(function(Term), Result) :-
!,
( xsd_cast(Term, Type, Value0)
-> eval(Value0, Value),
eval_cast(Type, Value, Result)
; eval_function(Term, Result)
).
eval(Term, Term). % Result of sub-eval
%! eval(+Type, +Term, -Result) is semidet.
%
% Evaluate Term, converting the resulting argument to Type.
typed_eval(no_eval, Term, Term).
typed_eval(any, Term, Result) :-
eval(Term, Result).
typed_eval(simple_literal, Term, Result) :-
eval(Term, Result).
typed_eval(boolean, Term, Result) :-
eval(Term, Result0),
effective_boolean_value(Result0, Result).
typed_eval(numeric, Term, Result) :-
eval(Term, Result),
Result = numeric(_,_).
eval_literal(type(Type, Atom), Value) :-
!,
eval_typed_literal(Type, Atom, Value).
eval_literal(lang(Lang, Atom), lang(Lang, Atom)) :- !.
eval_literal(Atom, simple_literal(Atom)) :-
atom(Atom),
!.
eval_typed_literal(Type, Atom, numeric(Type, Value)) :-
xsdp_numeric_uri(Type, Generic),
!,
numeric_literal_value(Generic, Atom, Value).
eval_typed_literal(Type, Atom, Value) :-
eval_known_typed_literal(Type, Atom, Value0),
!,
Value = Value0.
eval_typed_literal(Type, Atom, type(Type, Atom)).
%! eval_known_typed_literal(+Type, +Plain, -Typed) is semidet.
%
% Map known datatypes to a value that is suitable for comparison
% using Prolog standard order of terms. Note that the mapped time
% representations can all be compared.
:- rdf_meta eval_known_typed_literal(r, +, t).
eval_known_typed_literal(xsd:boolean, Atom, boolean(Atom)).
eval_known_typed_literal(xsd:string, Atom, string(Atom)).
eval_known_typed_literal(xsd:gYear, Atom, time(xsd:gYear, Atom)).
eval_known_typed_literal(xsd:gYearMonth, Atom, time(xsd:gYearMonth, Atom)).
eval_known_typed_literal(xsd:date, Atom, time(xsd:date, Atom)).
eval_known_typed_literal(xsd:dateTime, Atom, time(xsd:dateTime, Atom)).
%! numeric_literal_value(+Literal, -Value) is semidet.
%
% Convert a SPARQL numeric literal into its value for the purpose
% of comparison-by-value.
%
% @tbd Move this into the rdf_db library. There we can achieve
% better performance and we can do more efficient
% matching.
numeric_literal_value(Type, Text, Value) :-
rdf_equal(Type, xsd:integer),
!,
atom(Text),
atom_number(Text, Value),
integer(Value).
numeric_literal_value(Type, Text, Value) :-
rdf_equal(Type, xsd:decimal),
!,
atom(Text),
atom_number(Text, Value).
numeric_literal_value(_, Text, Value) :-
atom(Text),
atom_number(Text, Value),
!.
numeric_literal_value(_, Text, Value) :-
catch(rdf_text_to_float(Text, Value), _, fail).
rdf_text_to_float(Text, Value) :-
atom_codes(Text, Codes),
optional_sign(Codes, Rest, Sign),
( Rest = [0'.|_]
-> number_codes(NonnegValue, [0'0|Rest])
; last(Rest, 0'.)
-> append(Rest, [0'0], NonnegCodes),
number_codes(NonnegCodes, NonnegValue)
),
Value is NonnegValue*Sign.
optional_sign([0'+|Rest], Rest, 1) :- !.
optional_sign([0'-|Rest], Rest, -1) :- !.
optional_sign(Rest, Rest, 1).
% Evaluation of function arguments
eval_any(Term, Value) :-
eval(Term, Value),
!.
eval_any(_, boolean(error)).
eval_boolean(Term, Bool) :-
eval(Term, Value),
effective_boolean_value(Value, Bool),
!.
eval_boolean(_, boolean(error)).
eval_numeric(Term, Numeric) :-
eval(Term, Numeric),
Numeric = numeric(_,_),
!.
eval_numeric(_, boolean(error)).
%! sparql_op(+ListOfDelcs)
term_expansion((:- sparql_op(Decls)), Clauses) :-
maplist(decl_op, Decls, Clauses).
decl_op(Term, op_decl(Gen, Args)) :-
functor(Term, Name, Arity),
functor(Gen, Name, Arity),
Term =.. [Name|Args].
%! expand_op(+In, -Clause) is det.
%
% Expand SPARQL operators into a nice clause.
expand_op((op(Op,Result) :- Body),
[(op(Op1,Result) :- Body1), sparql_op(Op1)]) :-
rdf_global_term(Op, Op0),
functor(Op0, Name, Arity),
functor(Op1, Name, Arity),
( op_decl(Op1, Types)
-> true
; Op0 =.. [Name|Args],
maplist(op_arg_type, Args, Types)
),
Op0 =.. [Name|Args0],
Op1 =.. [Name|Args1],
maplist(convert_goal, Types, Args1, Args0, ConvertList),
list_to_conj(ConvertList, Convert),
mkconj(Convert, Body, Body1).
op_arg_type(Var, any) :- var(Var), !.
op_arg_type(boolean(_), boolean) :- !.
op_arg_type(numeric(_,_), numeric) :- !.
op_arg_type(simple_literal(_), simple_literal) :- !.
op_arg_type(_, any).
list_to_conj([], true).
list_to_conj([G], G) :- !.
list_to_conj([H|T], G) :-
list_to_conj(T, G1),
mkconj(H, G1, G).
mkconj(true, G, G) :- !.
mkconj(G, true, G) :- !.
mkconj(G1,G2,(G1,G2)).
convert_goal(no_eval, Arg, Arg, true).
convert_goal(any, Arg0, Arg1, eval_any(Arg0, Arg1)).
convert_goal(simple_literal, Arg0, Arg1, eval_any(Arg0, Arg1)).
convert_goal(boolean, Arg0, Arg1, eval_boolean(Arg0, Arg1)).
convert_goal(numeric, Arg0, Arg1, eval_numeric(Arg0, Arg1)).
term_expansion((op(Op,Result) :- Body), Clauses) :-
expand_op((op(Op,Result) :- Body), Clauses).
term_expansion((op(Op,Result)), Clauses) :-
expand_op((op(Op,Result) :- true), Clauses).
%! op(+Operator, -Result) is semidet.
%
% @param Operator Term of the format Op(Arg...) where each Arg
% is embedded in its type.
% @param Result Result-value, embedded in its type.
:- rdf_meta op(t,t).
:- discontiguous op/2, op_decl/2, sparql_op/1.
:- sparql_op([ bound(no_eval)
]).
% SPARQL Unary operators
op(not(boolean(X)), boolean(Result)) :-
not(X, Result).
op(+(numeric(Type, X)), numeric(Type, X)).
op(-(numeric(Type, X)), numeric(Type, Result)) :-
Result is -X.
% SPARQL Tests, defined in section 11.4
op(bound(X), boolean(Result)) :-
(bound(X) -> Result = true ; Result = false).
op(isiri(X), boolean(Result)) :-
(isiri(X) -> Result = true ; Result = false).
op(isuri(X), boolean(Result)) :-
(isiri(X) -> Result = true ; Result = false).
op(isblank(X), boolean(Result)) :-
(isblank(X) -> Result = true ; Result = false).
op(isliteral(X), boolean(Result)) :-
(isliteral(X) -> Result = true ; Result = false).
:- sparql_op([ iri(any, no_eval),
str(no_eval)
]).
% SPARQL Accessors
op(str(X), simple_literal(Str)) :-
str(X, Str).
op(lang(X), simple_literal(Lang)) :-
lang(X, Lang).
op(datatype(X), Type) :-
datatype(X, Type).
op(strdt(simple_literal(Lex), iri(Type)), type(Type, Lex)).
op(strlang(simple_literal(Lex), simple_literal(Lang)), lang(Lang, Lex)).
:- if(current_predicate(uuid/1)).
op(uuid, iri(URNUUID)) :-
uuid(UUID),
atom_concat('urn:uuid:', UUID, URNUUID).
op(struuid, simple_literal(UUID)) :-
uuid(UUID).
:- endif.
op(bnode, iri(Id)) :-
rdf_bnode(Id).
op(bnode(simple_literal(Id)), iri(BNode)) :-
id_to_bnode(Id, BNode).
op(iri(Spec, Base), iri(URI)) :-
iri(Spec, Base, URI).
% SPARQL Binary operators
% Logical connectives, defined in section 11.4
op(and(boolean(A), boolean(B)), boolean(Result)) :-
sparql_and(A, B, Result).
op(or(boolean(A), boolean(B)), boolean(Result)) :-
sparql_or(A, B, Result).
:- sparql_op([ coalesce(no_eval)
]).
% SPARQL functional forms
op(if(Test, V1, V2), Result) :-
typed_eval(boolean, Test, TestResult),
( TestResult == boolean(true)
-> eval(V1, Result)
; TestResult == boolean(false)
-> eval(V2, Result)
).
op(coalesce(List), Result) :-
member(Expr, List),
ground(Expr),
eval(Expr, Result),
\+ invalid(Result),
!.
invalid('$null$').
invalid(boolean(error)).
% XPath Tests
op(X = Y, boolean(Result)) :-
( equal(X, Y)
-> Result = true
; Result = false
).
op(X \= Y, boolean(Result)) :-
( equal(X, Y)
-> Result = false
; Result = true
).
equal(X, X) :- !.
equal(numeric(_, X), numeric(_, Y)) :- X =:= Y.
equal(boolean(A), boolean(B)) :-
eq_bool(A, B, true).
op(X < Y, boolean(Result)) :-
( lt(X,Y)
-> Result = true
; functor(X, Name, Arity),
functor(Y, Name, Arity)
-> Result = false
).
op(X > Y, boolean(Result)) :-
( gt(X,Y)
-> Result = true
; functor(X, Name, Arity),
functor(Y, Name, Arity)
-> Result = false
).
op(X =< Y, boolean(Result)) :-
( leq(X,Y)
-> Result = true
; functor(X, Name, Arity),
functor(Y, Name, Arity)
-> Result = false
).
op(X >= Y, boolean(Result)) :-
( geq(X,Y)
-> Result = true
; functor(X, Name, Arity),
functor(Y, Name, Arity)
-> Result = false
).
lt(numeric(_, X), numeric(_, Y)) :- X < Y.
lt(simple_literal(X), simple_literal(Y)) :- X @< Y.
lt(string(X), string(Y)) :- X @< Y.
lt(time(T, X), time(T, Y)) :- X @< Y.
lt(type(T, X), type(T, Y)) :- X @< Y.
gt(numeric(_, X), numeric(_, Y)) :- X > Y.
gt(simple_literal(X), simple_literal(Y)) :- X @> Y.
gt(string(X), string(Y)) :- X @> Y.
gt(time(T, X), time(T, Y)) :- X @> Y.
gt(type(T, X), type(T, Y)) :- X @> Y.
leq(numeric(_, X), numeric(_, Y)) :- X =< Y.
leq(simple_literal(X), simple_literal(Y)) :- X @=< Y.
leq(string(X), string(Y)) :- X @=< Y.
leq(time(T, X), time(T, Y)) :- X @=< Y.
leq(type(T, X), type(T, Y)) :- X @=< Y.
geq(numeric(_, X), numeric(_, Y)) :- X >= Y.
geq(simple_literal(X), simple_literal(Y)) :- X @>= Y.
geq(string(X), string(Y)) :- X @>= Y.
geq(time(T, X), time(T, Y)) :- X @>= Y.
geq(type(T, X), type(T, Y)) :- X @>= Y.
% arithmetic
op(numeric(TX, X) * numeric(TY, Y), numeric(Type, Result)) :-
Result is X * Y,
combine_types(TX, TY, Type).
op(numeric(TX, X) / numeric(TY, Y), numeric(Type, Result)) :-
Y =\= 0,
Result is X / Y,
combine_types_div(TX, TY, Type).
op(numeric(TX, X) + numeric(TY, Y), numeric(Type, Result)) :-
Result is X + Y,
combine_types(TX, TY, Type).
op(numeric(TX, X) - numeric(TY, Y), numeric(Type, Result)) :-
Result is X - Y,
combine_types(TX, TY, Type).
% arithmetic to support aggregates
op(min(numeric(TX, X), numeric(TY, Y)), numeric(Type, Result)) :-
( X < Y
-> Type = TX, Result = X
; X > Y
-> Type = TY, Result = Y
; combine_types(TX, TY, Type),
( Type == TX
-> Result = X
; Result = Y
)
).
op(max(numeric(TX, X), numeric(TY, Y)), numeric(Type, Result)) :-
( X > Y
-> Type = TX, Result = X
; X < Y
-> Type = TY, Result = Y
; combine_types(TX, TY, Type),
( Type == TX
-> Result = X
; Result = Y
)
).
% SPARQL Tests, defined in section 11.4
op(in(Value, List), boolean(Result)) :-
sparql_in(Value, List, Result).
op(not_in(Value, List), boolean(Result)) :-
sparql_in(Value, List, R0),
not(R0, Result).
sparql_in(Value, List, Result) :-
( memberchk(Value, List)
-> Result = true
; member(E, List),
eval(E, EV),
rdf_equal(Value, EV)
-> Result = true
; Result = false
).
% SPARQL builtin string functions (1.1)
:- sparql_op([ strlen(any),
substr(any, numeric),
substr(any, numeric, numeric),
ucase(any),
lcase(any),
strstarts(any, any),
strends(any, any),
contains(any, any),
strbefore(any, any),
strafter(any, any),
encode_for_uri(any),
concat(no_eval)
]).
op(strlen(A), numeric(xsd:integer, Len)) :-
string_op(A, Len, strlen).
op(substr(A, numeric(xsd:integer, Start)), R) :-
string_int_op_string(A, Start, R, substr).
op(substr(A, numeric(xsd:integer, Start), numeric(xsd:integer, Len)), R) :-
string_int_int_op_string(A, Start, Len, R, substr).
op(ucase(A), U) :-
string_op_string(A, U, ucase).
op(lcase(A), U) :-
string_op_string(A, U, lcase).
op(strstarts(String, Starts), boolean(True)) :-
argument_compatible(String, Starts, True, strstarts).
op(strends(String, Starts), boolean(True)) :-
argument_compatible(String, Starts, True, strends).
op(contains(String, Starts), boolean(True)) :-
argument_compatible(String, Starts, True, contains).
op(strbefore(A1, A2), R) :-
string_string_op(A1, A2, R, strbefore).
op(strafter(A1, A2), R) :-
string_string_op(A1, A2, R, strafter).
op(encode_for_uri(S), simple_literal(URI)) :-
str_value(S, Text),
uri_encoded(path, Text, IRI),
uri_iri(URI, IRI).
op(concat(List), R) :-
maplist(eval, List, Evaluated),
maplist(str_text, Evaluated, StrList),
atomic_list_concat(StrList, Lex),
( maplist(is_string, Evaluated)
-> R = string(Lex)
; maplist(is_lang(L), Evaluated)
-> R = lang(L, Lex)
; R = simple_literal(Lex)
).
op(langmatches(simple_literal(Lang),
simple_literal(Pat)),
boolean(Result)) :-
(lang_matches(Lang, Pat) -> Result = true ; Result = false).
op(regex(A, simple_literal(Pat)), boolean(Result)) :-
string_op(A, Result, regex(Pat, '')).
op(regex(A, simple_literal(Pat), simple_literal(Flags)), boolean(Result)) :-
string_op(A, Result, regex(Pat, Flags)).
op(compiled_regex(Regex, A), boolean(Result)) :-
string_op(A, Result, compiled_regex(Regex)).
op(replace(simple_literal(Input),
simple_literal(Pattern),
simple_literal(Replace),
simple_literal(Flags)),
simple_literal(Result)) :-
regex_replace(Input, Pattern, Replace, Flags, Result).
op(replace(string(Input),
simple_literal(Pattern),
simple_literal(Replace),
simple_literal(Flags)),
string(Result)) :-
regex_replace(Input, Pattern, Replace, Flags, Result).
op(replace(lang(Lang, Input),
simple_literal(Pattern),
simple_literal(Replace),
simple_literal(Flags)),
lang(Lang, Result)) :-
regex_replace(Input, Pattern, Replace, Flags, Result).
% SPARQL builtin numeric functions (1.1, 17.4.4)
:- sparql_op([ isnumeric(any)
]).
op(isnumeric(A), boolean(True)) :-
( A = numeric(_,_) -> True = true ; True = false ).
op(abs(numeric(T, A1)), numeric(T, R)) :-
R is abs(A1).
op(round(numeric(T, A1)), numeric(T, R)) :-
R is round(A1).
op(ceil(numeric(T, A1)), numeric(T, R)) :-
R is ceil(A1).
op(floor(numeric(T, A1)), numeric(T, R)) :-
R is floor(A1).
op(rand, numeric(xsd:double, R)) :-
R is random_float.
% SPARQL builtin date and time functions (1.1, 17.4.5)
op(now, time(xsd:dateTime, Date)) :-
get_time(Now),
format_time(atom(Date), '%FT%T.%3f%:z', Now).
op(year(time(Type, DateTime)), numeric(xsd:integer, Year)) :-
time_part(year, Type, DateTime, Year).
op(month(time(Type, DateTime)), numeric(xsd:integer, Month)) :-
time_part(month, Type, DateTime, Month).
op(day(time(Type, DateTime)), numeric(xsd:integer, Day)) :-
time_part(day, Type, DateTime, Day).
op(hours(time(Type, DateTime)), numeric(xsd:integer, Hours)) :-
time_part(hours, Type, DateTime, Hours).
op(minutes(time(Type, DateTime)), numeric(xsd:integer, Minutes)) :-
time_part(minutes, Type, DateTime, Minutes).
op(seconds(time(Type, DateTime)), numeric(xsd:decimal, Seconds)) :-
time_part(seconds, Type, DateTime, Seconds).
op(timezone(time(Type, DateTime)), type(xsd:dayTimeDuration, Timezone)) :-
time_part(tzs, Type, DateTime, TZs),
phrase(tz_offset(TZOffset), TZs),
xsd_duration_seconds(Timezone, TZOffset).
op(tz(time(Type, DateTime)), simple_literal(TZ)) :-
time_part(tz, Type, DateTime, TZ).
% SPARQL builtin hash functions (1.1, 17.4.6)
:- sparql_op([ md5(any),
sha1(any),
sha256(any),
sha384(any),
sha512(any)
]).
op(md5(String), simple_literal(Hash)) :-
string_hash(String, Hash, md5).
op(sha1(String), simple_literal(Hash)) :-
string_hash(String, Hash, sha1).
op(sha256(String), simple_literal(Hash)) :-
string_hash(String, Hash, sha256).
op(sha384(String), simple_literal(Hash)) :-
string_hash(String, Hash, sha384).
op(sha512(String), simple_literal(Hash)) :-
string_hash(String, Hash, sha512).
/*******************************
* HASH SUPPORT FUNCTIONS *
*******************************/
string_hash(simple_literal(S), Hash, Algorithm) :-
atom_hash(Algorithm, S, Hash).
string_hash(string(S), Hash, Algorithm) :-
atom_hash(Algorithm, S, Hash).
atom_hash(md5, S, Hash) :-
!,
rdf_atom_md5(S, 1, Hash).
atom_hash(SHA, S, Hash) :-
sha_hash(S, HashCodes,
[ algorithm(SHA),
encoding(utf8)
]),
hash_atom(HashCodes, Hash).
/*******************************
* TIME SUPPORT FUNCTIONS *
*******************************/
%! time_part(+Part, +Type, +String, -Value) is semidet.
:- if(current_predicate(sub_string/5)).
time_part(year, _Type, String, Value) :-
!,
sub_string(String, 0, 4, _, Digits),
number_string(Value, Digits).
time_part(month, _Type, String, Value) :-
!,
sub_string(String, 5, 2, _, Digits),
number_string(Value, Digits).
time_part(day, _Type, String, Value) :-
!,
sub_string(String, 8, 2, _, Digits),
number_string(Value, Digits).
:- endif.
time_part(Part, _Type, DateTime, Value) :-
atom_codes(DateTime, Codes),
phrase(time_dcg(Part, Value), Codes, _).
time_dcg(year, Year) --> digits4(Year).
time_dcg(month, Month) --> time_dcg(year, _), "-", digits2(Month).
time_dcg(day, Day) --> time_dcg(month, _), "-", digits2(Day).
time_dcg(hours, Hours) --> time_dcg(day, _), "T", digits2(Hours).
time_dcg(minutes, Min) --> time_dcg(hours, _), ":", digits2(Min).
time_dcg(seconds, Sec) --> time_dcg(minutes, _), ":", number(Sec).
time_dcg(tzs, TZs) --> time_dcg(seconds, _), string_without("", TZs).
time_dcg(tz, TZ) --> time_dcg(tzs, TZs), { atom_codes(TZ, TZs) }.
tz_offset(TZOffset) -->
"Z", !, { TZOffset = 0 }.
tz_offset(TZOffset) -->
"+", digits2(Hours), ":", digits2(Minutes),
{ TZOffset is Hours*3600+Minutes*60 }.
tz_offset(TZOffset) -->
"-", digits2(Hours), ":", digits2(Minutes),
{ TZOffset is -(Hours*3600+Minutes*60) }.
%! seconds_xsd_duration(+Seconds, -XSDDuration)
%
% @see http://docs.oracle.com/cd/E13214_01/wli/docs92/xref/xqdurfunc.html#wp1183764
% @tbd Implement other direction and move this to XSD or datetime
% library.
xsd_duration_seconds(XSDDuration, Secs) :-
var(XSDDuration),
!,
must_be(number, Secs),
phrase(xsd_duration(Secs), Codes),
atom_codes(XSDDuration, Codes).
xsd_duration(Secs) -->
{ Secs < 0, !, PosSecs is -Secs },
"-",
xsd_duration(PosSecs).
xsd_duration(Secs) -->
{ Secs =:= 0 },
!,
"PT0S".
xsd_duration(Secs) -->
"P",
xsd_duration_days(Secs, Rem),
xsd_duration_time(Rem).
xsd_duration_days(Secs, Rem) -->
{ Days is Secs // (24*3600),
Days > 0,
!,
Rem is Secs - Days*24*3600
},
integer(Days),
"D".
xsd_duration_days(Secs, Secs) --> "".
xsd_duration_time(Secs) -->
{ Secs =:= 0 },
!.
xsd_duration_time(Secs) -->
"T",
xsd_duration_hours(Secs, S1),
xsd_duration_minutes(S1, S2),
xsd_duration_seconds(S2).
xsd_duration_hours(Secs, Rem) -->
{ Hours is Secs // 3600,
Hours > 0,
!,
Rem is Secs - Hours*3600
},
integer(Hours),
"H".
xsd_duration_hours(Secs, Secs) --> "".
xsd_duration_minutes(Secs, Rem) -->
{ Min is Secs // 60,
Min > 0,
!,
Rem is Secs - Min*60
},
integer(Min),
"M".
xsd_duration_minutes(Secs, Secs) --> "".
xsd_duration_seconds(Secs) -->
{ Secs =:= 0 },
!.
xsd_duration_seconds(Secs) -->
number(Secs),
"S".
digits4(Value) -->
digit(D1),digit(D2),digit(D3),digit(D4),
{ number_codes(Value, [D1,D2,D3,D4]) }.
digits2(Value) -->
digit(D1),digit(D2),
{ number_codes(Value, [D1,D2]) }.
/*******************************
* STRING SUPPORT PRIMITIVES *
*******************************/
is_string(string(_)).
is_lang(L, lang(L,_)).
%! string_op1(+A1, -R, +Op)
string_op(simple_literal(A), R, Op) :-
atom_op(Op, A, R).
string_op(lang(_, A), R, Op) :-
atom_op(Op, A, R).
string_op(string(A), R, Op) :-
atom_op(Op, A, R).
%! string_op_string(+A, -R)
string_op_string(simple_literal(A), simple_literal(R), Op) :-
atom_op(Op, A, R).
string_op_string(lang(L,A), lang(L,R), Op) :-
atom_op(Op, A, R).
string_op_string(string(A), string(R), Op) :-
atom_op(Op, A, R).
%! string_int_op_string(+S0, +I, -S)
string_int_op_string(simple_literal(S0), I, simple_literal(S), Op) :-
atom_op(Op, S0, I, S).
string_int_op_string(lang(L, S0), I, lang(L, S), Op) :-
atom_op(Op, S0, I, S).
string_int_op_string(string(S0), I, string(S), Op) :-
atom_op(Op, S0, I, S).
%! string_int_int_op_string(+S0, +I, -S)
string_int_int_op_string(simple_literal(S0), I1, I2, simple_literal(S), Op) :-
atom_op(Op, S0, I1, I2, S).
string_int_int_op_string(lang(L, S0), I1, I2, lang(L, S), Op) :-
atom_op(Op, S0, I1, I2, S).
string_int_int_op_string(string(S0), I1, I2, string(S), Op) :-
atom_op(Op, S0, I1, I2, S).
%! string_op2(+A1, +A2, -R, +Op)
%
% Define operations on strings.
string_string_op(simple_literal(A1), simple_literal(A2), Result, Op) :-
( atom_op(Op, A1, A2, R)
-> Result = simple_literal(R)
; Result = simple_literal('')
).
string_string_op(simple_literal(A1), string(A2), Result, Op) :-
( atom_op(Op, A1, A2, R)
-> Result = simple_literal(R)
; Result = simple_literal('')
).
string_string_op(string(A1), simple_literal(A2), Result, Op) :-
( atom_op(Op, A1, A2, R)
-> Result = string(R)
; Result = simple_literal('')
).
string_string_op(string(A1), string(A2), Result, Op) :-
( atom_op(Op, A1, A2, R)
-> Result = string(R)
; Result = simple_literal('')
).
string_string_op(lang(L, A1), lang(L, A2), Result, Op) :-
( atom_op(Op, A1, A2, R)
-> Result = lang(L, R)
; Result = simple_literal('')
).
string_string_op(lang(L, A1), string(A2), Result, Op) :-
( atom_op(Op, A1, A2, R)
-> Result = lang(L, R)
; Result = simple_literal('')
).
string_string_op(lang(L, A1), simple_literal(A2), Result, Op) :-
( atom_op(Op, A1, A2, R)
-> Result = lang(L, R)
; Result = simple_literal('')
).
%! iri(+Spec, +Base, -IRI)
iri(simple_literal(URI0), Base, URI) :-
!,
uri_normalized(URI0, Base, URI).
iri(string(URI0), Base, URI) :-
uri_normalized(URI0, Base, URI).
iri(iri(URI), _, URI).
%! argument_compatible(+A1, +A2, -Bool, +Op)
argument_compatible(simple_literal(A1), simple_literal(A2), Bool, Op) :-
!,
arg_compatible(Op, A1, A2, Bool).
argument_compatible(simple_literal(A1), string(A2), Bool, Op) :-
!,
arg_compatible(Op, A1, A2, Bool).
argument_compatible(string(A1), simple_literal(A2), Bool, Op) :-
!,
arg_compatible(Op, A1, A2, Bool).
argument_compatible(string(A1), string(A2), Bool, Op) :-
!,
arg_compatible(Op, A1, A2, Bool).
argument_compatible(lang(L,A1), lang(L,A2), Bool, Op) :-
!,
arg_compatible(Op, A1, A2, Bool).
argument_compatible(lang(_,A1), simple_literal(A2), Bool, Op) :-
!,
arg_compatible(Op, A1, A2, Bool).
argument_compatible(lang(_,A1), string(A2), Bool, Op) :-
!,
arg_compatible(Op, A1, A2, Bool).
argument_compatible(_, _, boolean(error), _).
arg_compatible(Op, A1, A2, Bool) :-
( arg_compatible(Op, A1, A2)
-> Bool = true
; Bool = false
).
arg_compatible(strstarts, A1, A2) :- sub_atom(A1, 0, _, _, A2).
arg_compatible(strends, A1, A2) :- sub_atom(A1, _, _, 0, A2).
arg_compatible(contains, A1, A2) :- sub_atom(A1, _, _, _, A2), !.
%! atom_op(+Op, +Atom, -Result).
atom_op(strlen, A, Len) :-
atom_length(A, Len).
atom_op(ucase, A, U) :-
upcase_atom(A, U).
atom_op(lcase, A, U) :-
downcase_atom(A, U).
atom_op(compiled_regex(Regex), Data, Matches) :-
( compiled_regex(Regex, Data)
-> Matches = true
; Matches = false
).
atom_op(regex(Pat, Flags), Data, Matches) :-
( regex(Data, Pat, Flags)
-> Matches = true
; Matches = false
).
%! atom_op(+Op, +Atom, +Arg, -Result).
atom_op(substr, Atom, Start, Sub) :-
S is Start - 1,
( sub_atom(Atom, S, _, 0, Sub0)
-> Sub = Sub0
; Sub = '' % is this ok?
).
atom_op(strbefore, Atom, Search, Before) :-
( Search == ''
-> Before = ''
; sub_atom(Atom, BL, _, _, Search)
-> sub_atom(Atom, 0, BL, _, Before)
).
atom_op(strafter, Atom, Search, After) :-
( sub_atom(Atom, _, _, AL, Search)
-> sub_atom(Atom, _, AL, 0, After)
).
%! atom_op(+Op, +Atom, +A1, +A2, -Result).
atom_op(substr, Atom, Start, Len, Sub) :-
S is Start - 1,
( sub_atom(Atom, S, Len, _, Sub0)
-> Sub = Sub0
; sub_atom(Atom, S, _, 0, Sub0)
-> Sub = Sub0
; Sub = '' % is this ok?
).
% Numeric types follows the Xpath definitions of
% http://www.w3.org/TR/xpath-functions/#numeric-functions
% TBD:
%! combine_types_div(+TypeLeft, +TypeRight, -Type)
combine_types_div(TX, TY, T) :-
rdf_equal(xsd:integer, IntType),
xsdp_numeric_uri(TX, IntType),
xsdp_numeric_uri(TY, IntType),
!,
rdf_equal(xsd:decimal, T).
combine_types_div(TX, TY, T) :-
combine_types(TX, TY, T).
%! combine_types(+TypeLeft, +TypeRight, -Type)
%combine_types(T, T, T) :- !.
combine_types(TL, TR, T) :-
xsdp_numeric_uri(TL, STL),
xsdp_numeric_uri(TR, STR),
promote_types(STL, STR, T).
promote_types(TL, TR, T) :-
type_index(TL, IL),
type_index(TR, IR),
TI is max(IL, IR),
type_index(T, TI),