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/docs/libs/gitbook-2.6.7/js/plugin-search.js:
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1 | gitbook.require(["gitbook", "lodash", "jQuery"], function(gitbook, _, $) {
2 | var index = null;
3 | var $searchInput, $searchLabel, $searchForm;
4 | var $highlighted = [], hi, hiOpts = { className: 'search-highlight' };
5 | var collapse = false, toc_visible = [];
6 |
7 | // Use a specific index
8 | function loadIndex(data) {
9 | // [Yihui] In bookdown, I use a character matrix to store the chapter
10 | // content, and the index is dynamically built on the client side.
11 | // Gitbook prebuilds the index data instead: https://github.com/GitbookIO/plugin-search
12 | // We can certainly do that via R packages V8 and jsonlite, but let's
13 | // see how slow it really is before improving it. On the other hand,
14 | // lunr cannot handle non-English text very well, e.g. the default
15 | // tokenizer cannot deal with Chinese text, so we may want to replace
16 | // lunr with a dumb simple text matching approach.
17 | index = lunr(function () {
18 | this.ref('url');
19 | this.field('title', { boost: 10 });
20 | this.field('body');
21 | });
22 | data.map(function(item) {
23 | index.add({
24 | url: item[0],
25 | title: item[1],
26 | body: item[2]
27 | });
28 | });
29 | }
30 |
31 | // Fetch the search index
32 | function fetchIndex() {
33 | return $.getJSON(gitbook.state.basePath+"/search_index.json")
34 | .then(loadIndex); // [Yihui] we need to use this object later
35 | }
36 |
37 | // Search for a term and return results
38 | function search(q) {
39 | if (!index) return;
40 |
41 | var results = _.chain(index.search(q))
42 | .map(function(result) {
43 | var parts = result.ref.split("#");
44 | return {
45 | path: parts[0],
46 | hash: parts[1]
47 | };
48 | })
49 | .value();
50 |
51 | // [Yihui] Highlight the search keyword on current page
52 | $highlighted = results.length === 0 ? [] : $('.page-inner')
53 | .unhighlight(hiOpts).highlight(q, hiOpts).find('span.search-highlight');
54 | scrollToHighlighted(0);
55 |
56 | return results;
57 | }
58 |
59 | // [Yihui] Scroll the chapter body to the i-th highlighted string
60 | function scrollToHighlighted(d) {
61 | var n = $highlighted.length;
62 | hi = hi === undefined ? 0 : hi + d;
63 | // navignate to the previous/next page in the search results if reached the top/bottom
64 | var b = hi < 0;
65 | if (d !== 0 && (b || hi >= n)) {
66 | var path = currentPath(), n2 = toc_visible.length;
67 | if (n2 === 0) return;
68 | for (var i = b ? 0 : n2; (b && i < n2) || (!b && i >= 0); i += b ? 1 : -1) {
69 | if (toc_visible.eq(i).data('path') === path) break;
70 | }
71 | i += b ? -1 : 1;
72 | if (i < 0) i = n2 - 1;
73 | if (i >= n2) i = 0;
74 | var lnk = toc_visible.eq(i).find('a[href$=".html"]');
75 | if (lnk.length) lnk[0].click();
76 | return;
77 | }
78 | if (n === 0) return;
79 | var $p = $highlighted.eq(hi);
80 | $p[0].scrollIntoView();
81 | $highlighted.css('background-color', '');
82 | // an orange background color on the current item and removed later
83 | $p.css('background-color', 'orange');
84 | setTimeout(function() {
85 | $p.css('background-color', '');
86 | }, 2000);
87 | }
88 |
89 | function currentPath() {
90 | var href = window.location.pathname;
91 | href = href.substr(href.lastIndexOf('/') + 1);
92 | return href === '' ? 'index.html' : href;
93 | }
94 |
95 | // Create search form
96 | function createForm(value) {
97 | if ($searchForm) $searchForm.remove();
98 | if ($searchLabel) $searchLabel.remove();
99 | if ($searchInput) $searchInput.remove();
100 |
101 | $searchForm = $('