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/**
* Insight search plugin
* @author PPOffice { @link https://github.com/ppoffice }
*/
(function ($, CONFIG) {
var $main = $('.ins-search');
var $input = $main.find('.ins-search-input');
var $wrapper = $main.find('.ins-section-wrapper');
var $container = $main.find('.ins-section-container');
$main.parent().remove('.ins-search');
$('body').append($main);
function section (title) {
return $('<section>').addClass('ins-section')
.append($('<header>').addClass('ins-section-header').text(title));
}
function searchItem (icon, title, slug, preview, url) {
return $('<div>').addClass('ins-selectable').addClass('ins-search-item')
.append($('<header>').append($('<i>').addClass('icon').addClass('icon-' + icon)).append(title != null && title != '' ? title : CONFIG.TRANSLATION['UNTITLED'])
.append(slug ? $('<span>').addClass('ins-slug').text(slug) : null))
.append(preview ? $('<p>').addClass('ins-search-preview').text(preview) : null)
.attr('data-url', url);
}
function sectionFactory (type, array) {
var sectionTitle;
var $searchItems;
if (array.length === 0) return null;
sectionTitle = CONFIG.TRANSLATION[type];
switch (type) {
case 'POSTS':
$searchItems = array.map(function (item) {
// Use config.root instead of permalink to fix url issue
return searchItem('file', item.title, null, item.content.slice(0, 150), item.uri);
});
break;
case 'CATEGORIES':
case 'TAGS':
$searchItems = array.map(function (item) {
return searchItem(type === 'CATEGORIES' ? 'folder' : 'tag', item.title, '', null, item.uri);
});
break;
default:
return null;
}
return section(sectionTitle).append($searchItems);
}
function parseKeywords (keywords) {
return keywords.split(' ').filter(function (keyword) {
return !!keyword;
}).map(function (keyword) {
return keyword.toUpperCase();
});
}
/**
* Judge if a given post/page/category/tag contains all of the keywords.
* @param Object obj Object to be weighted
* @param Array<String> fields Object's fields to find matches
*/
function filter (keywords, obj, fields) {
var result = false;
var keywordArray = parseKeywords(keywords);
var containKeywords = keywordArray.filter(function (keyword) {
var containFields = fields.filter(function (field) {
if (!obj.hasOwnProperty(field))
return false;
if (obj[field].toUpperCase().indexOf(keyword) > -1)
return true;
});
if (containFields.length > 0)
return true;
return false;
});
return containKeywords.length === keywordArray.length;
}
function filterFactory (keywords) {
return {
POST: function (obj) {
return filter(keywords, obj, ['title', 'content']);
},
PAGE: function (obj) {
return filter(keywords, obj, ['title', 'content']);
},
CATEGORY: function (obj) {
return filter(keywords, obj, ['title']);
},
TAG: function (obj) {
return filter(keywords, obj, ['title']);
}
};
}
/**
* Calculate the weight of a matched post/page/category/tag.
* @param Object obj Object to be weighted
* @param Array<String> fields Object's fields to find matches
* @param Array<Integer> weights Weight of every field
*/
function weight (keywords, obj, fields, weights) {
var value = 0;
parseKeywords(keywords).forEach(function (keyword) {
var pattern = new RegExp(keyword, 'img'); // Global, Multi-line, Case-insensitive
fields.forEach(function (field, index) {
if (obj.hasOwnProperty(field)) {
var matches = obj[field].match(pattern);
value += matches ? matches.length * weights[index] : 0;
}
});
});
return value;
}
function weightFactory (keywords) {
return {
POST: function (obj) {
return weight(keywords, obj, ['title', 'content'], [3, 1]);
},
PAGE: function (obj) {
return weight(keywords, obj, ['title', 'content'], [3, 1]);
},
CATEGORY: function (obj) {
return weight(keywords, obj, ['title'], [1]);
},
TAG: function (obj) {
return weight(keywords, obj, ['title'], [1]);
}
};
}
function search (json, keywords) {
var WEIGHTS = weightFactory(keywords);
var FILTERS = filterFactory(keywords);
var posts = json.posts;
var tags = json.tags;
var categories = json.categories;
return {
posts: posts.filter(FILTERS.POST).sort(function (a, b) { return WEIGHTS.POST(b) - WEIGHTS.POST(a); }).slice(0,5),
categories: categories.filter(FILTERS.CATEGORY).sort(function (a, b) { return WEIGHTS.CATEGORY(b) - WEIGHTS.CATEGORY(a); }).slice(0,5),
tags: tags.filter(FILTERS.TAG).sort(function (a, b) { return WEIGHTS.TAG(b) - WEIGHTS.TAG(a); }).slice(0,5)
};
}
function searchResultToDOM (searchResult) {
$container.empty();
for (var key in searchResult) {
$container.append(sectionFactory(key.toUpperCase(), searchResult[key]));
}
}
function scrollTo ($item) {
if ($item.length === 0) return;
var wrapperHeight = $wrapper[0].clientHeight;
var itemTop = $item.position().top - $wrapper.scrollTop();
var itemBottom = $item[0].clientHeight + $item.position().top;
if (itemBottom > wrapperHeight + $wrapper.scrollTop()) {
$wrapper.scrollTop(itemBottom - $wrapper[0].clientHeight);
}
if (itemTop < 0) {
$wrapper.scrollTop($item.position().top);
}
}
function selectItemByDiff (value) {
var $items = $.makeArray($container.find('.ins-selectable'));
var prevPosition = -1;
$items.forEach(function (item, index) {
if ($(item).hasClass('active')) {
prevPosition = index;
return;
}
});
var nextPosition = ($items.length + prevPosition + value) % $items.length;
$($items[prevPosition]).removeClass('active');
$($items[nextPosition]).addClass('active');
scrollTo($($items[nextPosition]));
}
function gotoLink ($item) {
if ($item && $item.length) {
location.href = $item.attr('data-url');
}
}
$.getJSON(CONFIG.CONTENT_URL, function (json) {
if (location.hash.trim() === '#ins-search') {
$main.addClass('show');
}
$input.on('input', function () {
var keywords = $(this).val();
searchResultToDOM(search(json, keywords));
});
$input.trigger('input');
});
$(document).on('click focus', '.search-form-input', function () {
$main.addClass('show');
$main.find('.ins-search-input').focus();
}).on('click', '.ins-search-item', function () {
gotoLink($(this));
}).on('click', '.ins-close', function () {
$main.removeClass('show');
}).on('keydown', function (e) {
if (!$main.hasClass('show')) return;
switch (e.keyCode) {
case 27: // ESC
$main.removeClass('show'); break;
case 38: // UP
selectItemByDiff(-1); break;
case 40: // DOWN
selectItemByDiff(1); break;
case 13: //ENTER
gotoLink($container.find('.ins-selectable.active').eq(0)); break;
}
});
})(jQuery, window.INSIGHT_CONFIG);
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