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:- module(episode_data, [retract_episode/1,
lookup_episode/3,
lookup_episode_local/3,
lookup_episode_remote/3]).
:- use_module(library(dcg/basics)).
:- use_module(library(http/http_open)).
:- use_module(library(sgml)).
:- use_module(library(xpath)).
:- use_module(library(persistency)).
:- use_module(atom_dcg).
:- persistent episode_name_data(episode:integer, name:atom, data:list).
attach :-
absolute_file_name('episode_data.db', F, [access(write)]),
db_attach(F, []).
detach :-
db_detach.
retract_episode(Ep) :-
( episode_name_data(Ep, _, _)
-> retractall_episode_name_data(Ep, _, _)
; true
).
padding(Ep) --> { Ep < 10 }, "00".
padding(Ep) --> { Ep >= 10, Ep < 100 }, "0".
padding(Ep) --> { Ep >= 100 }.
episode_number(Ep) --> padding(Ep), integer(Ep).
lookup_episode(Ep, Name, Data) :- lookup_episode_local(Ep, Name, Data), !.
lookup_episode(Ep, Name, Data) :- lookup_episode_remote(Ep, Name, Data).
lookup_episode_local(Ep, Name, Data) :-
episode_name_data(Ep, Name, Data).
lookup_episode_remote(Ep, Name, Data) :-
catch(http_load_html(
'https://www.detectiveconanworld.com/wiki/Next_Conan%27s_Hint',
D),
_,
fail),
xpath(D, //tr, D1),
xpath(D1, td(index(1),text), T),
atom_phrase(episode_number(Ep), T),
xpath(D1, td(index(2),text), Name),
xpath(D1, td(index(3),text), Hint),
Data = ['Hint'(Hint)],
assert_episode_name_data(Ep, Name, Data).
http_load_html(URL, DOM) :-
setup_call_cleanup(http_open(URL, In,
[ timeout(60)
]),
( dtd(html, DTD),
load_structure(stream(In),
DOM,
[ dtd(DTD),
dialect(sgml),
shorttag(false),
max_errors(-1),
syntax_errors(quiet)
])
),
close(In)).
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