nyc-bookstores/node_modules/cheerio/lib/parse.js

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2013-05-27 20:45:59 +00:00
/*
Module Dependencies
*/
var htmlparser = require('htmlparser2'),
_ = require('underscore'),
isTag = require('./utils').isTag;
/*
Parser
*/
exports = module.exports = function(content, options) {
var dom = evaluate(content, options);
// Generic root element
var root = {
type: 'root',
name: 'root',
parent: null,
prev: null,
next: null,
children: []
};
// Update the dom using the root
update(dom, root);
return root;
};
var evaluate = exports.evaluate = function(content, options) {
// options = options || $.fn.options;
var handler = new htmlparser.DomHandler(options),
parser = new htmlparser.Parser(handler, options);
parser.write(content);
parser.done();
return connect(handler.dom);
};
var connect = exports.connect = function(dom, parent) {
parent = parent || null;
var prevElem = null;
_.each(dom, function(elem) {
// If tag and no attributes, add empty object
if (isTag(elem.type) && elem.attribs === undefined)
elem.attribs = {};
// Set parent
elem.parent = parent;
// Previous Sibling
elem.prev = prevElem;
// Next sibling
elem.next = null;
if (prevElem) prevElem.next = elem;
// Run through the children
if (elem.children)
connect(elem.children, elem);
else if (isTag(elem.type))
elem.children = [];
// Get ready for next element
prevElem = elem;
});
return dom;
};
/*
Update the dom structure, for one changed layer
* Much faster than reconnecting
*/
var update = exports.update = function(arr, parent) {
// normalize
if (!Array.isArray(arr)) arr = [arr];
// Update neighbors
for (var i = 0; i < arr.length; i++) {
arr[i].prev = arr[i - 1] || null;
arr[i].next = arr[i + 1] || null;
arr[i].parent = parent || null;
}
// Update parent
parent.children = arr;
return parent;
};
// module.exports = $.extend(exports);