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1 /* Part of DML (Digital Music Laboratory)
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2 Copyright 2014-2015 Samer Abdallah, University of London
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3
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4 This program is free software; you can redistribute it and/or
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5 modify it under the terms of the GNU General Public License
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6 as published by the Free Software Foundation; either version 2
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7 of the License, or (at your option) any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public
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15 License along with this library; if not, write to the Free Software
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16 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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17 */
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18
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19 :- module(uripattern, [
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20 simplify/2
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21 , pattern_uri/2
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22 ]).
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23
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24 :- use_module(library(semweb/rdf_db), [ rdf_global_id/2 ]).
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25
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26 :- multifile uripattern:def/2.
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27
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28 %% pattern_uri(+P:uripattern,-X:uri) is det.
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29 %% pattern_uri(-P:uripattern,+X:uri) is det.
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30 pattern_uri(P,URI) :-
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31 ( var(URI) -> uri(P,String), atom_string(URI,String)
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32 ; atomic(URI) -> atom_string(URI,String), uri(P,String)
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33 ).
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34
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35 uri(P:A,QB) :-
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36 rdf_global_id(P:'',Q),
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37 ( var(QB) -> uri(A,B), string_concat(Q,B,QB)
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38 ; string_concat(Q,B,QB), uri(A,B)
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39 ).
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40 uri(\(M),B) :- def(M,A), uri(A,B).
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41 uri(num(N),B) :- number_string(B,N).
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42 uri(enc(A),B) :- (var(B) -> www_form_encode(A,B1), atom_string(B1,B); www_form_encode(A,B)).
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43 uri(A1/A2,B) :-
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44 ( var(B) -> uri(A1,B1), uri(A2,B2), atomics_to_string([B1,B2],"/",B)
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45 ; sub_string(B,Bef,_,Aft,"/"),
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46 sub_string(B,0,Bef,_,B1), uri(A1,B1),
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47 sub_string(B,_,Aft,0,B2), uri(A2,B2)
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48 ).
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49 uri(A,B) :- atomic(A), atom_string(A,B).
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50
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51
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52 %% simplify(+P1:uri_pattern, -P2:uri_pattern) is nondet.
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53 % Non-deterministic maximal reduction of URI pattern.
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54 simplify(E1,E3) :-
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55 reduce(E1,E2) *-> simplify(E2,E3); E1=E3.
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56
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57 % simplify resource if possible, fails otherwise
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58 % The pattern must be nonvar.
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59 reduce(A,B) :- must_be(nonvar,A), reduce1(A,B).
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60
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61 reduce1(num(N),A) :- number(N), atom_number(A,N).
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62 reduce1(\(A),B) :- must_be(nonvar,A), def(A,B).
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63 reduce1(enc(A),B) :- atomic(A), www_form_encode(A,B).
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64 reduce1(tail(A),A) :- atomic(A).
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65 reduce1(P:A,P:B) :- reduce(A,B).
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66 reduce1(P:A,PB) :- atomic(A), rdf_global_id(P:A,PB).
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67 reduce1(P:(A/B),PA/B) :- reduce(P:A,PA).
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68 reduce1(A/B,A1/B) :- reduce(A,A1).
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69 reduce1(A/B,A/B1) :- reduce(B,B1). % nb to get past these, A and B must be nonvar
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70 reduce1(A/B,AB) :- atom(A), atom(B), atomic_list_concat([A,B],'/',AB).
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71 reduce1((A/B)/C,A/BC) :- reduce1(B/C,BC).
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72 reduce1(A/(B/C),AB/C) :- reduce1(A/B,AB).
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73 reduce1((A/B)/C,A/(B/C)).
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74
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