08-27-周三_17-09-29

node_modules/cheerio/lib/static.js

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+/**
+ * Module dependencies
+ */
+
+var serialize = require('dom-serializer'),
+    select = require('css-select'),
+    parse = require('./parse'),
+    _ = {
+      merge: require('lodash.merge'),
+      defaults: require('lodash.defaults')
+    };
+
+/**
+ * $.load(str)
+ */
+
+exports.load = function(content, options) {
+  var Cheerio = require('./cheerio');
+
+  options = _.defaults(options || {}, Cheerio.prototype.options);
+
+  var root = parse(content, options);
+
+  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) {
+  var Cheerio = require('./cheerio');
+
+  // 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(options || {}, this._options, Cheerio.prototype.options);
+
+  return render(this, dom, options);
+};
+
+/**
+ * $.xml([selector | dom])
+ */
+
+exports.xml = function(dom) {
+  var options = _.defaults({xmlMode: 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') {
+      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);
+  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;
+};