1 ! Copyright (C) 2008 Doug Coleman.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: accessors assocs combinators combinators.short-circuit
4 fry html.parser http.client io kernel locals math math.statistics
5 sequences sets splitting unicode.case unicode.categories urls
6 urls.encoding shuffle ;
7 IN: html.parser.analyzer
9 : scrape-html ( url -- response vector )
12 : attribute ( tag string -- obj/f )
13 swap attributes>> at ;
15 : attribute* ( tag string -- obj ? )
16 swap attributes>> at* ;
18 : attribute? ( tag string -- ? )
19 swap attributes>> key? ;
21 : find-all ( seq quot -- alist )
22 [ <enum> >alist ] [ '[ second @ ] ] bi* filter ; inline
24 : loopn-index ( n quot -- )
25 [ iota ] [ '[ @ not ] ] bi* find 2drop ; inline
28 [ drop ] prepose loopn-index ; inline
30 : html-class? ( tag string -- ? )
31 swap "class" attribute [ blank? ] split-when member? ;
33 : html-id? ( tag string -- ? )
34 swap "id" attribute = ;
36 ERROR: undefined-find-nth m n seq quot ;
38 : check-trivial-find ( m n seq quot -- m n seq quot )
39 pick 0 = [ undefined-find-nth ] when ; inline
41 : find-nth-from ( m n seq quot -- i/f elt/f )
42 check-trivial-find [ f ] 3dip '[
43 drop _ _ find-from [ dup [ 1 + ] when ] dip over
44 ] loopn [ dup [ 1 - ] when ] dip ; inline
46 : find-nth ( n seq quot -- i/f elt/f )
47 [ 0 ] 3dip find-nth-from ; inline
49 : find-last-nth-from ( m n seq quot -- i/f elt/f )
50 check-trivial-find [ f ] 3dip '[
51 drop _ _ find-last-from [ dup [ 1 - ] when ] dip over
52 ] loopn [ dup [ 1 + ] when ] dip ; inline
54 : find-last-nth ( n seq quot -- i/f elt/f )
55 [ [ nip length 1 - ] [ ] 2bi ] dip find-last-nth-from ; inline
57 : find-first-name ( vector string -- i/f tag/f )
58 >lower '[ name>> _ = ] find ; inline
60 : stack-find ( seq quot: ( elt -- 1/0/-1 ) -- i/f )
61 map cum-sum 0 swap index ; inline
63 : tag-classifier ( string -- quot )
65 '[ dup name>> _ = [ closing?>> -1 1 ? ] [ drop 0 ] if ] ; inline
67 : find-between* ( vector i/f tag/f -- vector )
69 [ tail-slice ] [ name>> ] bi*
70 dupd tag-classifier stack-find [ 1 + ] [ 1 ] if*
76 : find-between ( vector i/f tag/f -- vector )
77 find-between* dup length 3 >= [
78 [ rest-slice but-last-slice ] keep like
81 : find-between-first ( vector string -- vector' )
82 dupd find-first-name find-between ; inline
84 : find-between-all ( vector quot -- seq )
86 '[ _ [ closing?>> not ] bi and ] find-all
87 [ first2 find-between* ] with map ; inline
89 : remove-blank-text ( vector -- vector' )
92 [ text>> [ blank? ] all? not ] [ drop t ] if
95 : trim-text ( vector -- vector' )
98 [ [ [ blank? ] trim ] change-text ] when
101 : find-by-id ( vector id -- vector' elt/f )
102 '[ _ html-id? ] find ;
104 : find-by-class ( vector id -- vector' elt/f )
105 '[ _ html-class? ] find ;
107 : find-by-name ( vector string -- vector elt/f )
108 >lower '[ name>> _ = ] find ;
110 : find-by-id-between ( vector string -- vector' )
111 '[ _ html-id? ] dupd find find-between* ;
113 : find-by-class-between ( vector string -- vector' )
114 '[ _ html-class? ] dupd find find-between* ;
116 : find-by-class-id-between ( vector class id -- vector' )
118 [ _ html-class? ] [ _ html-id? ] bi and
119 ] dupd find find-between* ;
121 : find-by-attribute-key ( vector key -- vector' )
122 >lower '[ _ attribute? ] filter sift ;
124 : find-by-attribute-key-value ( vector value key -- vector' )
125 >lower swap '[ _ attribute _ = ] filter sift ;
127 : find-first-attribute-key-value ( vector value key -- i/f tag/f )
128 >lower swap '[ _ attribute _ = ] find ;
130 : find-links ( vector -- vector' )
131 [ { [ name>> "a" = ] [ "href" attribute ] } 1&& ]
134 : find-images ( vector -- vector' )
135 [ { [ name>> "img" = ] [ "src" attribute ] } 1&& ] filter sift
136 [ "src" attribute ] map ;
138 : find-by-text ( seq quot -- tag )
139 [ dup name>> text = ] prepose find drop ; inline
141 : find-opening-tags-by-name ( name seq -- seq )
142 [ { [ name>> = ] [ closing?>> not ] } 1&& ] with find-all ;
144 : href-contains? ( str tag -- ? )
145 "href" attribute* [ subseq? ] [ 2drop f ] if ;
147 : find-hrefs ( vector -- vector' )
148 [ { [ name>> "a" = ] [ "href" attribute? ] } 1&& ] filter sift
149 [ "href" attribute >url ] map ;
151 : find-frame-links ( vector -- vector' )
152 [ { [ name>> "frame" = ] [ "src" attribute? ] } 1&& ] filter sift
153 [ "src" attribute >url ] map ;
155 : find-script-links ( vector -- vector' )
156 [ { [ name>> "script" = ] [ "src" attribute? ] } 1&& ] filter sift
157 [ "src" attribute >url ] map ;
159 : find-all-links ( vector -- vector' )
160 [ find-hrefs ] [ find-frame-links ] [ find-script-links ] tri union union ;
162 : find-forms ( vector -- vector' )
163 "form" over find-opening-tags-by-name
164 swap [ [ first2 ] dip find-between* ] curry map
165 [ [ name>> { "form" "input" } member? ] filter ] map ;
167 : find-html-objects ( vector string -- vector' )
168 over find-opening-tags-by-name
169 [ first2 find-between* ] with map ;
171 : form-action ( vector -- string )
172 [ name>> "form" = ] find nip "action" attribute ;
174 : hidden-form-values ( vector -- strings )
175 [ "type" attribute "hidden" = ] filter ;
178 [ name>> print ] [ attributes>> ] bi
179 [ bl bl bl bl [ write "=" write ] [ write bl ] bi* nl ] assoc-each ;
181 : form. ( vector -- )
182 [ closing?>> not ] filter
185 { [ dup name>> "form" = ]
186 [ "form action: " write "action" attribute print ] }
187 { [ dup name>> "input" = ] [ input. ] }
192 : query>assoc* ( str -- hash )
193 "?" split1 nip query>assoc ;
195 : opening-tag? ( tag -- ? )
198 TUPLE: link attributes clickable ;
200 : <link> ( vector -- link )
201 [ first attributes>> ]
202 [ [ name>> { text "img" } member? ] filter ] bi
205 : link. ( vector -- )
206 [ "href" attribute write nl ]
207 [ clickable>> [ bl bl text>> print ] each nl ] bi ;