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/**
* Module dependencies
*/
var serialize = require('dom-serializer'),
defaultOptions = require('./options').default,
flattenOptions = require('./options').flatten,
select = require('css-select'),
parse = require('./parse'),
_ = {
merge: require('lodash/merge'),
defaults: require('lodash/defaults')
};
/**
* $.load(str)
*/
exports.load = function(content, options, isDocument) {
var Cheerio = require('./cheerio');
options = _.defaults(flattenOptions(options || {}), defaultOptions);
if (isDocument === void 0)
isDocument = true;
var root = parse(content, options, isDocument);
var initialize = function(selector, context, r, opts) {
if (!(this instanceof initialize)) {
return new initialize(selector, context, r, opts);
}
opts = _.defaults(opts || {}, options);
return Cheerio.call(this, selector, context, r || root, opts);
};
// Ensure that selections created by the "loaded" `initialize` function are
// true Cheerio instances.
initialize.prototype = Object.create(Cheerio.prototype);
initialize.prototype.constructor = initialize;
// Mimic jQuery's prototype alias for plugin authors.
initialize.fn = initialize.prototype;
// Keep a reference to the top-level scope so we can chain methods that implicitly
// resolve selectors; e.g. $("<span>").(".bar"), which otherwise loses ._root
initialize.prototype._originalRoot = root;
// Add in the static methods
_.merge(initialize, exports);
// Add in the root
initialize._root = root;
// store options
initialize._options = options;
return initialize;
};
/*
* Helper function
*/
function render(that, dom, options) {
if (!dom) {
if (that._root && that._root.children) {
dom = that._root.children;
} else {
return '';
}
} else if (typeof dom === 'string') {
dom = select(dom, that._root, options);
}
return serialize(dom, options);
}
/**
* $.html([selector | dom], [options])
*/
exports.html = function(dom, options) {
// be flexible about parameters, sometimes we call html(),
// with options as only parameter
// check dom argument for dom element specific properties
// assume there is no 'length' or 'type' properties in the options object
if (Object.prototype.toString.call(dom) === '[object Object]' && !options && !('length' in dom) && !('type' in dom))
{
options = dom;
dom = undefined;
}
// sometimes $.html() used without preloading html
// so fallback non existing options to the default ones
options = _.defaults(flattenOptions(options || {}), this._options, defaultOptions);
return render(this, dom, options);
};
/**
* $.xml([selector | dom])
*/
exports.xml = function(dom) {
var options = _.defaults({xml: true}, this._options);
return render(this, dom, options);
};
/**
* $.text(dom)
*/
exports.text = function(elems) {
if (!elems) {
elems = this.root();
}
var ret = '',
len = elems.length,
elem;
for (var i = 0; i < len; i++) {
elem = elems[i];
if (elem.type === 'text') ret += elem.data;
else if (elem.children && elem.type !== 'comment' && elem.tagName !== 'script' && elem.tagName !== 'style') {
ret += exports.text(elem.children);
}
}
return ret;
};
/**
* $.parseHTML(data [, context ] [, keepScripts ])
* Parses a string into an array of DOM nodes. The `context` argument has no
* meaning for Cheerio, but it is maintained for API compatibility with jQuery.
*/
exports.parseHTML = function(data, context, keepScripts) {
var parsed;
if (!data || typeof data !== 'string') {
return null;
}
if (typeof context === 'boolean') {
keepScripts = context;
}
parsed = this.load(data, defaultOptions, false);
if (!keepScripts) {
parsed('script').remove();
}
// The `children` array is used by Cheerio internally to group elements that
// share the same parents. When nodes created through `parseHTML` are
// inserted into previously-existing DOM structures, they will be removed
// from the `children` array. The results of `parseHTML` should remain
// constant across these operations, so a shallow copy should be returned.
return parsed.root()[0].children.slice();
};
/**
* $.root()
*/
exports.root = function() {
return this(this._root);
};
/**
* $.contains()
*/
exports.contains = function(container, contained) {
// According to the jQuery API, an element does not "contain" itself
if (contained === container) {
return false;
}
// Step up the descendants, stopping when the root element is reached
// (signaled by `.parent` returning a reference to the same object)
while (contained && contained !== contained.parent) {
contained = contained.parent;
if (contained === container) {
return true;
}
}
return false;
};
/**
* $.merge()
*/
exports.merge = function(arr1, arr2) {
if(!(isArrayLike(arr1) && isArrayLike(arr2))){
return;
}
var newLength = arr1.length + arr2.length;
var i = 0;
while(i < arr2.length){
arr1[i + arr1.length] = arr2[i];
i++;
}
arr1.length = newLength;
return arr1;
};
function isArrayLike(item){
if(Array.isArray(item)){
return true;
}
if(typeof item !== 'object'){
return false;
}
if(!item.hasOwnProperty('length')){
return false;
}
if(typeof item.length !== 'number') {
return false;
}
if(item.length < 0){
return false;
}
var i = 0;
while(i < item.length){
if(!(i in item)){
return false;
}
i++;
}
return true;
}
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