2 * (C) Copyright 2007-2008 Jeremy Maitin-Shepard
4 * Portions of this file were derived from Vimperator,
5 * (C) Copyright 2007 Doug Kearns
6 * (C) Copyright 2007-2008 Martin Stubenschrott.
8 * Use, modification, and distribution are subject to the terms specified in the
12 require("element.js");
14 const RELATIONSHIP_NEXT = 0;
15 const RELATIONSHIP_PREVIOUS = 1;
17 var browser_relationship_rel_name = ["next", "previous"];
18 var browser_relationship_rel_regexp = ["next", "prev|previous"];
19 var browser_relationship_rev_regexp = ["prev|previous", "next"];
21 define_variable("browser_relationship_patterns", {},
22 "Patterns used by `follow-next' and `follow-previous'. "+
23 "User value may be overridden for specific websites by "+
26 browser_relationship_patterns[RELATIONSHIP_NEXT] =
28 new RegExp("^>$","i"),
29 new RegExp("^(>>|»)$","i"),
30 new RegExp("^(>|»)","i"),
31 new RegExp("(>|»)$","i"),
32 new RegExp("\\bnext","i")
35 browser_relationship_patterns[RELATIONSHIP_PREVIOUS] =
36 [/^(prev|previous)$/i,
37 new RegExp("^<$","i"),
38 new RegExp("^(<<|«)$","i"),
39 new RegExp("^(<|«)","i"),
40 new RegExp("(<|«)$","i"),
41 new RegExp("\\bprev|previous\\b","i")
44 function document_get_element_by_relationship(buffer, doc, relationship) {
45 var patterns = buffer.get('browser_relationship_patterns')[relationship];
46 var rel_name = new RegExp(browser_relationship_rel_regexp[relationship], "i");
47 var rev_name = new RegExp(browser_relationship_rev_regexp[relationship], "i");
49 var elems = doc.getElementsByTagName("link");
50 // links have higher priority than normal <a> hrefs
51 for (var i = 0; i < elems.length; i++)
53 if (rel_name.test(elems[i].rel) || rev_name.test(elems[i].rev))
57 // no links? ok, look for hrefs
58 elems = doc.getElementsByTagName("a");
59 for (var i = 0; i < elems.length; i++)
61 if (rel_name.test(elems[i].rel) || rev_name.test(elems[i].rev))
65 for (var j = 0; j < patterns.length; ++j)
67 var pattern = patterns[j];
68 for (var i = 0; i < elems.length; i++) // Loop through list of A elements again
70 if (pattern.test(elems[i].textContent))
73 // images with alt text being href
74 var children = elems[i].childNodes;
75 for (var k = 0; k < children.length; k++)
77 if (pattern.test(children[k].alt))
85 define_browser_object_class(
86 "relationship-next", "Relationship-Next", null,
87 function (I, prompt) {
88 check_buffer(I.buffer, content_buffer);
89 var doc = I.buffer.document;
90 for (let frame in frame_iterator(I.buffer.top_frame, I.buffer.focused_frame)) {
91 let elem = document_get_element_by_relationship(
92 I.buffer, frame.document, RELATIONSHIP_NEXT);
94 yield co_return(elem);
98 define_browser_object_class(
99 "relationship-previous", "Relationship-Previous", null,
100 function (I, prompt) {
101 check_buffer(I.buffer, content_buffer);
102 var doc = I.buffer.document;
103 for (let frame in frame_iterator(I.buffer.top_frame, I.buffer.focused_frame)) {
104 let elem = document_get_element_by_relationship(
105 I.buffer, frame.document, RELATIONSHIP_PREVIOUS);
107 yield co_return(elem);