diff --git a/docs/Makefile b/docs/Makefile new file mode 100755 index 00000000..42ea7ddb --- /dev/null +++ b/docs/Makefile @@ -0,0 +1,20 @@ +# Minimal makefile for Sphinx documentation +# + +# You can set these variables from the command line. +SPHINXOPTS = +SPHINXBUILD = python -msphinx +SPHINXPROJ = scancodeserver +SOURCEDIR = . +BUILDDIR = _build + +# Put it first so that "make" without argument is like "make help". +help: + @$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O) + +.PHONY: help Makefile + +# Catch-all target: route all unknown targets to Sphinx using the new +# "make mode" option. $(O) is meant as a shortcut for $(SPHINXOPTS). +%: Makefile + @$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O) \ No newline at end of file diff --git a/docs/about.rst b/docs/about.rst new file mode 100755 index 00000000..55f5e9e6 --- /dev/null +++ b/docs/about.rst @@ -0,0 +1,16 @@ +About AboutCode +=========================================== + +Open Source for Open Source: software license, origin and packages discovery + +AboutCode is a project to uncover data ... about software code: + + - where does it come from? + - what is its license? copyright? + - is it secure, maintained, well coded? + +All these are questions that are important to find answers to when there are million of free and open source software components available on the web. + +Where software comes from and what is its license should be a problem of the past such that everyone can safely consume more free and open source software. + +Our tools are used to help detect and report the origin and license of source code, packages and binaries as well as discover software and package dependencies, and track security vulnerabilities, bugs and other important software component attributes. \ No newline at end of file diff --git a/docs/build/doctrees/about.doctree b/docs/build/doctrees/about.doctree new file mode 100755 index 00000000..bd40a41e Binary files /dev/null and b/docs/build/doctrees/about.doctree differ diff --git a/docs/build/doctrees/environment.pickle b/docs/build/doctrees/environment.pickle new file mode 100755 index 00000000..92354b49 Binary files /dev/null and b/docs/build/doctrees/environment.pickle differ diff --git a/docs/build/doctrees/index.doctree b/docs/build/doctrees/index.doctree new file mode 100755 index 00000000..0a777c7c Binary files /dev/null and b/docs/build/doctrees/index.doctree differ diff --git a/docs/build/doctrees/installation.doctree b/docs/build/doctrees/installation.doctree new file mode 100755 index 00000000..cb4768b0 Binary files /dev/null and b/docs/build/doctrees/installation.doctree differ diff --git a/docs/build/doctrees/intro.doctree b/docs/build/doctrees/intro.doctree new file mode 100755 index 00000000..096c341a Binary files /dev/null and b/docs/build/doctrees/intro.doctree differ diff --git a/docs/build/doctrees/plan.doctree b/docs/build/doctrees/plan.doctree new file mode 100755 index 00000000..77368b3f Binary files /dev/null and b/docs/build/doctrees/plan.doctree differ diff --git a/docs/build/html/.buildinfo b/docs/build/html/.buildinfo new file mode 100755 index 00000000..b924c587 --- /dev/null +++ b/docs/build/html/.buildinfo @@ -0,0 +1,4 @@ +# Sphinx build info version 1 +# This file hashes the configuration used when building these files. When it is not found, a full rebuild will be done. +config: 0016d9ee49c94563eda85820a7d56477 +tags: 645f666f9bcd5a90fca523b33c5a78b7 diff --git a/docs/build/html/_sources/about.rst.txt b/docs/build/html/_sources/about.rst.txt new file mode 100755 index 00000000..55f5e9e6 --- /dev/null +++ b/docs/build/html/_sources/about.rst.txt @@ -0,0 +1,16 @@ +About AboutCode +=========================================== + +Open Source for Open Source: software license, origin and packages discovery + +AboutCode is a project to uncover data ... about software code: + + - where does it come from? + - what is its license? copyright? + - is it secure, maintained, well coded? + +All these are questions that are important to find answers to when there are million of free and open source software components available on the web. + +Where software comes from and what is its license should be a problem of the past such that everyone can safely consume more free and open source software. + +Our tools are used to help detect and report the origin and license of source code, packages and binaries as well as discover software and package dependencies, and track security vulnerabilities, bugs and other important software component attributes. \ No newline at end of file diff --git a/docs/build/html/_sources/index.rst.txt b/docs/build/html/_sources/index.rst.txt new file mode 100755 index 00000000..2cb9262b --- /dev/null +++ b/docs/build/html/_sources/index.rst.txt @@ -0,0 +1,80 @@ +.. scancode server documentation master file, created by + sphinx-quickstart on Tue Aug 22 13:06:48 2017. + You can adapt this file completely to your liking, but it should at least + contain the root `toctree` directive. + +Welcome to scancode server's documentation! +=========================================== + +This is the documentation for the scan code server. A project which uses ScanCode as a library in a web and REST API application that allows you to scan code on demand by entering a URL and then store the scan results. + +Copyright and License +=========================================== + +The project’s idea belongs to AboutCode and Philippe Ombredanne and it has been developed under Google summer of code 2017 by Raju Koushik and Ranvir Singh. + +It is distributed under an open-source Apache License. Please find LICENSE in top level directory for details. + +Installation +=========================================== + +Note: these instructions are tested only for now only on Debian and +Debian derivative Linux distros. + +The ScanCode server is designed to run on POSIX (Linux, Mac, etc). +Windows is not tested and not supported for now. + + +1. System requirements + +- Get Python 2.7.x installed first and pip (pip is included in the + Python.org downloads since Python 2.7.9) + +- Install PosgreSQL 9.5.x of later. (9.6 preferred) + On Debian distros use: `sudo apt-get install postgresql-9.5-dev` + +- Install extra utilities if needed: `sudo apt-get install wget build-essential redis-server` + + +2. Configure a local test database + +- Create a local test `scancode` database user. Use `scancode` as password when prompted + (otherwise use any password and update your settings locally). + `sudo -u postgres createuser --no-createrole --no-superuser --login --inherit --createdb --pwprompt scancode` + +- Create a local test`scancode` database. + `createdb --encoding=utf-8 --owner=scancode --user=scancode --password --host=localhost --port=5432 scancode` + +3. Install and configure the ScanCode server + +- Get a clone or archive for the code from https://github.com/nexB/scancode-server + +- `cd` to the cloned or extracted archive directory + +- Create a local virtual environment with `virtualenv .` and activate this with `source bin/activate` +- Install the required dependencies with `pip install -r requirements.txt` +- Create the db schema `python manage.py migrate` +- Create a local admin user with `python manage.py createsuperuser` +- Run a local test server with `python manage.py runserver` +- Run `redis-server` +- Run a local celery worker in a separate shell with `celery -A scanapp worker -l info` +- Fire a browser at http://127.0.0.1:8000/admin/ to access the adminFire a browser at http://127.0.0.1:8000/admin/ to access the admin + + +.. toctree:: + :maxdepth: 2 + :caption: Contents: + + intro + about + installation + plan + + + +Indices and tables +================== + +* :ref:`genindex` +* :ref:`modindex` +* :ref:`search` diff --git a/docs/build/html/_sources/installation.rst.txt b/docs/build/html/_sources/installation.rst.txt new file mode 100755 index 00000000..5b94f872 --- /dev/null +++ b/docs/build/html/_sources/installation.rst.txt @@ -0,0 +1,44 @@ +Installation +=========================================== + +Note: these instructions are tested only for now only on Debian and +Debian derivative Linux distros. + +The ScanCode server is designed to run on POSIX (Linux, Mac, etc). +Windows is not tested and not supported for now. + + +1. System requirements + +- Get Python 2.7.x installed first and pip (pip is included in the + Python.org downloads since Python 2.7.9) + +- Install PosgreSQL 9.5.x of later. (9.6 preferred) + On Debian distros use: `sudo apt-get install postgresql-9.5-dev` + +- Install extra utilities if needed: `sudo apt-get install wget build-essential redis-server` + + +2. Configure a local test database + +- Create a local test `scancode` database user. Use `scancode` as password when prompted + (otherwise use any password and update your settings locally). + `sudo -u postgres createuser --no-createrole --no-superuser --login --inherit --createdb --pwprompt scancode` + +- Create a local test`scancode` database. + `createdb --encoding=utf-8 --owner=scancode --user=scancode --password --host=localhost --port=5432 scancode` + +3. Install and configure the ScanCode server + +- Get a clone or archive for the code from https://github.com/nexB/scancode-server + +- `cd` to the cloned or extracted archive directory + +- Create a local virtual environment with `virtualenv .` and activate this with `source bin/activate` +- Install the required dependencies with `pip install -r requirements.txt` +- Create the db schema `python manage.py migrate` +- Create a local admin user with `python manage.py createsuperuser` +- Run a local test server with `python manage.py runserver` +- Run `redis-server` +- Run a local celery worker in a separate shell with `celery -A scanapp worker -l info` +- Fire a browser at http://127.0.0.1:8000/admin/ to access the adminFire a browser at http://127.0.0.1:8000/admin/ to access the admin \ No newline at end of file diff --git a/docs/build/html/_sources/intro.rst.txt b/docs/build/html/_sources/intro.rst.txt new file mode 100755 index 00000000..f7653058 --- /dev/null +++ b/docs/build/html/_sources/intro.rst.txt @@ -0,0 +1,19 @@ +Introduction +=========================================== + +This is a server for the ScanCode toolkit(https://github.com/nexB/scancode-toolkit). + +A project which uses ScanCode as a library in a web and REST API application that allows you to scan code on demand by entering a URL and then store the scan results. + +This is a work-in-progress... + +The goal is to provide a minimal web UI and a comprehensive REST API to: + + - scan code for origin, licensing and dependencies for a remote URL, a + remote repo or a file upload. + - store scan results and eventually offer a central storage place for + ScanCode scans even when done using the ScanCode CLI app. + - offer some Travis and/or Github integration to scan on commit with + webhooks. + - eventually offer extra goodies such as scan based on a received tweet + of similar IRC or IM integration. \ No newline at end of file diff --git a/docs/build/html/_sources/plan.rst.txt b/docs/build/html/_sources/plan.rst.txt new file mode 100755 index 00000000..80cbdea5 --- /dev/null +++ b/docs/build/html/_sources/plan.rst.txt @@ -0,0 +1,117 @@ +Common Plan +=========================================== + + +#### Goals + +1. Create a backend server in Django to run ScanCode. +2. Add helpful features to ScanCode server and implement storage. +3. Create GitHub integration feature on the server. +4. Create a nice website for the project. +5. Write the basic documentation. +6. Create the Twitter bot to scan code and return the result. +7. Create the Slack bot to scan code and return the result. + +The starred goals could be carried out if there are no time constraints. + +#### Goal 1: Create a backend server in Django to run ScanCode. + +##### SUBTASKS + +- [X] Initialize the Django project. +- [X] Setup Django Rest Framework for the API. +- [X] Put all the requirements in the requirements.txt file. +- [X] Writing the getting started documentation. +- [X] Allow uploading from the local. +- [X] Allow scanning of URL’s. +- [X] Run the scancode commands on the server. +- [X] POST API would be scripted to scan the code and which would return the HTML or JSON giving the results as a response to the POST request. + + +#### Goal 2: Add helpful features to ScanCode server and implement storage. +##### The following models are needed to be implemented. +- [X] User model - Already exists. We only need to use it. +- [X] User history model +- [X] The code information model +- [X] Scanned results + +##### SUBTASKS +- [ ] Create POST API endpoint to ScanCode given GitHub or BitBucket or Git URL. +- [X] Use Celery in the backend. +- [X] Show the status of the scan while the scanning is going on and scan result when the scan is complete. +- [] The scanning can take a lot of time depending on the size of the project so I suggest we should use a Celery queue in the background and let the scan run there. Once the scan is done, we can return the result URL in the API response. +What celery does here is, once an API request to send a GitHub repo is sent, we will queue the task of scanning that repo in Celery. Then we will return the user with a task URL. The user will have to periodically send a GET request to the task_url to see if the job is finished. Once the job is finished, the response at task_url will change and it will show the URL to fetch scan result. + +##### Note: + +At this point, we have two types of return for an API request to scan code. We should go with the Celery based approach because we can’t be sure that ScanCode will always finish in a fraction of second. And stalling the server’s main thread is never a good idea. So the response type of scan requests should be Celery based task_url. + +#### Goal 2.5 Write unit tests +- [X] Write unit tests for tasks.py +- [X] Write unit tests for views.py +- [X] Write unit tests for models.py + +#### Goal 3: Create GitHub integration feature on the server. + +GitHub integration can be a cool feature for ScanCode. Using this, people would be able to hook ScanCode in their repos and each time they do a commit or a PR, our server will send a comment in the commit/PR telling what new licenses were added and what were deleted. + +##### SUBTASKS + +- [ ] Create API endpoint to check for commit (single) changes. +- [ ] Create API endpoint to check for PR (can be multiple commits) changes. +- [ ] Create a Travis script (in Python) to send a request to those endpoints with the commit/PR information. +- [ ] This script will also wait for and fetch the response and send it as a comment to the respective commit/PR. +- [ ] Implement a webhook in the server to do the same. It will also receive commit/PR information as API actions and it will analyze the commit/PR and post back comments on GitHub with the ScanCode report. + +#### Goal 4: Website + +After the features of this project are completed, I plan to create a nice website to show information about using the ScanCode API, the GitHub integration and the Twitter and Slack bots. This website will just contain few beautiful pages with information on these topics. + +##### SUBTASKS + +- [X] Create the website using Django. +- [ ] Host it on AWS or any other hosting service. + + +The following page can be the home page of the scancode website. The main components to the homepage are: + +#### First View: +![home](https://cloud.githubusercontent.com/assets/11356398/26746455/326730c0-480d-11e7-9219-da9334b427ac.png) +##### Header: + +The homepage starts with a fixed header. On left, there is space for the logo or the name of the website. On the right corner we get the options to LOGIN and SIGNUP. + +##### A quote: + +A quote that describes what we are trying to achieve using this website. + +##### Buttons: + +These buttons are the main action buttons for the user. For now, we can add three options and later on we can add another option for the user who can choose a list. The three main options, for now, can be: + +- [ ] Scan from a URL. +- [ ] Upload files from the PC. +- [ ] Write your code. + +There is a separate line of action when the user chooses a different option. + +##### Footer: + +The page ends with a footer which will contain the copyright notice and the name of the parent company along with some reference to the important information. + +#### Second view: +![second](https://cloud.githubusercontent.com/assets/11356398/26746456/326845dc-480d-11e7-8000-98d2930f4503.png) +Now this page will be opened if the user clicks on the scan an URL button. Most of the part will remain same. The only change that will come is in the centre where there will be an input box and label on the left saying: Enter the URL. Finally, there is an option to submit the code. + +#### Third view: +![upload](https://cloud.githubusercontent.com/assets/11356398/26746454/3266f182-480d-11e7-910a-54d6742b59ed.png) +This page will be opened when the user clicks on the button saying UPLOAD files from local. Once the user selects the directories and clicks on the submit button, a progress bar will start and files will start uploading to the server. + +For the third part, we will add a text editor where the user can enter or paste the code. When the user submits the code, we can add a feature to represent the different part of the code with different colours is a good option. We can represent the author and licence information with some different colours that differentiate it from the other part of the code. + +#### Goal 5: Creating documentation + +In this part, we will be working on making the documentation. How to install and how to use documentation is the least we can do for the start. + + + diff --git a/docs/build/html/_static/ajax-loader.gif b/docs/build/html/_static/ajax-loader.gif new file mode 100755 index 00000000..61faf8ca Binary files /dev/null and b/docs/build/html/_static/ajax-loader.gif differ diff --git a/docs/build/html/_static/basic.css b/docs/build/html/_static/basic.css new file mode 100755 index 00000000..6df76b0a --- /dev/null +++ b/docs/build/html/_static/basic.css @@ -0,0 +1,639 @@ +/* + * basic.css + * ~~~~~~~~~ + * + * Sphinx stylesheet -- basic theme. + * + * :copyright: Copyright 2007-2017 by the Sphinx team, see AUTHORS. + * :license: BSD, see LICENSE for details. + * + */ + +/* -- main layout ----------------------------------------------------------- */ + +div.clearer { + clear: both; +} + +/* -- relbar ---------------------------------------------------------------- */ + +div.related { + width: 100%; + font-size: 90%; +} + +div.related h3 { + display: none; 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b/docs/build/html/_static/doctools.js new file mode 100755 index 00000000..56549772 --- /dev/null +++ b/docs/build/html/_static/doctools.js @@ -0,0 +1,287 @@ +/* + * doctools.js + * ~~~~~~~~~~~ + * + * Sphinx JavaScript utilities for all documentation. + * + * :copyright: Copyright 2007-2017 by the Sphinx team, see AUTHORS. + * :license: BSD, see LICENSE for details. + * + */ + +/** + * select a different prefix for underscore + */ +$u = _.noConflict(); + +/** + * make the code below compatible with browsers without + * an installed firebug like debugger +if (!window.console || !console.firebug) { + var names = ["log", "debug", "info", "warn", "error", "assert", "dir", + "dirxml", "group", "groupEnd", "time", "timeEnd", "count", "trace", + "profile", "profileEnd"]; + window.console = {}; + for (var i = 0; i < names.length; ++i) + window.console[names[i]] = function() {}; +} + */ + +/** + * small helper function to urldecode strings + */ +jQuery.urldecode = function(x) { + return decodeURIComponent(x).replace(/\+/g, ' '); +}; + +/** + * small helper function to urlencode strings + */ +jQuery.urlencode = encodeURIComponent; + +/** + * This function returns the parsed url parameters of the + * current request. Multiple values per key are supported, + * it will always return arrays of strings for the value parts. + */ +jQuery.getQueryParameters = function(s) { + if (typeof s == 'undefined') + s = document.location.search; + var parts = s.substr(s.indexOf('?') + 1).split('&'); + var result = {}; + for (var i = 0; i < parts.length; i++) { + var tmp = parts[i].split('=', 2); + var key = jQuery.urldecode(tmp[0]); + var value = jQuery.urldecode(tmp[1]); + if (key in result) + result[key].push(value); + else + result[key] = [value]; + } + return result; +}; + +/** + * highlight a given string on a jquery object by wrapping it in + * span elements with the given class name. + */ +jQuery.fn.highlightText = function(text, className) { + function highlight(node) { + if (node.nodeType == 3) { + var val = node.nodeValue; + var pos = val.toLowerCase().indexOf(text); + if (pos >= 0 && !jQuery(node.parentNode).hasClass(className)) { + var span = document.createElement("span"); + span.className = className; + span.appendChild(document.createTextNode(val.substr(pos, text.length))); + node.parentNode.insertBefore(span, node.parentNode.insertBefore( + document.createTextNode(val.substr(pos + text.length)), + node.nextSibling)); + node.nodeValue = val.substr(0, pos); + } + } + else if (!jQuery(node).is("button, select, textarea")) { + jQuery.each(node.childNodes, function() { + highlight(this); + }); + } + } + return this.each(function() { + highlight(this); + }); +}; + +/* + * backward compatibility for jQuery.browser + * This will be supported until firefox bug is fixed. + */ +if (!jQuery.browser) { + jQuery.uaMatch = function(ua) { + ua = ua.toLowerCase(); + + var match = /(chrome)[ \/]([\w.]+)/.exec(ua) || + /(webkit)[ \/]([\w.]+)/.exec(ua) || + /(opera)(?:.*version|)[ \/]([\w.]+)/.exec(ua) || + /(msie) ([\w.]+)/.exec(ua) || + ua.indexOf("compatible") < 0 && /(mozilla)(?:.*? rv:([\w.]+)|)/.exec(ua) || + []; + + return { + browser: match[ 1 ] || "", + version: match[ 2 ] || "0" + }; + }; + jQuery.browser = {}; + jQuery.browser[jQuery.uaMatch(navigator.userAgent).browser] = true; +} + +/** + * Small JavaScript module for the documentation. + */ +var Documentation = { + + init : function() { + this.fixFirefoxAnchorBug(); + this.highlightSearchWords(); + this.initIndexTable(); + + }, + + /** + * i18n support + */ + TRANSLATIONS : {}, + PLURAL_EXPR : function(n) { return n == 1 ? 0 : 1; }, + LOCALE : 'unknown', + + // gettext and ngettext don't access this so that the functions + // can safely bound to a different name (_ = Documentation.gettext) + gettext : function(string) { + var translated = Documentation.TRANSLATIONS[string]; + if (typeof translated == 'undefined') + return string; + return (typeof translated == 'string') ? translated : translated[0]; + }, + + ngettext : function(singular, plural, n) { + var translated = Documentation.TRANSLATIONS[singular]; + if (typeof translated == 'undefined') + return (n == 1) ? singular : plural; + return translated[Documentation.PLURALEXPR(n)]; + }, + + addTranslations : function(catalog) { + for (var key in catalog.messages) + this.TRANSLATIONS[key] = catalog.messages[key]; + this.PLURAL_EXPR = new Function('n', 'return +(' + catalog.plural_expr + ')'); + this.LOCALE = catalog.locale; + }, + + /** + * add context elements like header anchor links + */ + addContextElements : function() { + $('div[id] > :header:first').each(function() { + $('\u00B6'). + attr('href', '#' + this.id). + attr('title', _('Permalink to this headline')). + appendTo(this); + }); + $('dt[id]').each(function() { + $('\u00B6'). + attr('href', '#' + this.id). + attr('title', _('Permalink to this definition')). + appendTo(this); + }); + }, + + /** + * workaround a firefox stupidity + * see: https://bugzilla.mozilla.org/show_bug.cgi?id=645075 + */ + fixFirefoxAnchorBug : function() { + if (document.location.hash) + window.setTimeout(function() { + document.location.href += ''; + }, 10); + }, + + /** + * highlight the search words provided in the url in the text + */ + highlightSearchWords : function() { + var params = $.getQueryParameters(); + var terms = (params.highlight) ? params.highlight[0].split(/\s+/) : []; + if (terms.length) { + var body = $('div.body'); + if (!body.length) { + body = $('body'); + } + window.setTimeout(function() { + $.each(terms, function() { + body.highlightText(this.toLowerCase(), 'highlighted'); + }); + }, 10); + $('') + .appendTo($('#searchbox')); + } + }, + + /** + * init the domain index toggle buttons + */ + initIndexTable : function() { + var togglers = $('img.toggler').click(function() { + var src = $(this).attr('src'); + var idnum = $(this).attr('id').substr(7); + $('tr.cg-' + idnum).toggle(); + if (src.substr(-9) == 'minus.png') + $(this).attr('src', src.substr(0, src.length-9) + 'plus.png'); + else + $(this).attr('src', src.substr(0, src.length-8) + 'minus.png'); + }).css('display', ''); + if (DOCUMENTATION_OPTIONS.COLLAPSE_INDEX) { + togglers.click(); + } + }, + + /** + * helper function to hide the search marks again + */ + hideSearchWords : function() { + $('#searchbox .highlight-link').fadeOut(300); + $('span.highlighted').removeClass('highlighted'); + }, + + /** + * make the url absolute + */ + makeURL : function(relativeURL) { + return DOCUMENTATION_OPTIONS.URL_ROOT + '/' + relativeURL; + }, + + /** + * get the current relative url + */ + getCurrentURL : function() { + var path = document.location.pathname; + var parts = path.split(/\//); + $.each(DOCUMENTATION_OPTIONS.URL_ROOT.split(/\//), function() { + if (this == '..') + parts.pop(); + }); + var url = parts.join('/'); + return path.substring(url.lastIndexOf('/') + 1, path.length - 1); + }, + + initOnKeyListeners: function() { + $(document).keyup(function(event) { + var activeElementType = document.activeElement.tagName; + // don't navigate when in search box or textarea + if (activeElementType !== 'TEXTAREA' && activeElementType !== 'INPUT' && activeElementType !== 'SELECT') { + switch (event.keyCode) { + case 37: // left + var prevHref = $('link[rel="prev"]').prop('href'); + if (prevHref) { + window.location.href = prevHref; + return false; + } + case 39: // right + var nextHref = $('link[rel="next"]').prop('href'); + if (nextHref) { + window.location.href = nextHref; + return false; + } + } + } + }); + } +}; + +// quick alias for translations +_ = Documentation.gettext; + +$(document).ready(function() { + Documentation.init(); +}); \ No newline at end of file diff --git a/docs/build/html/_static/down-pressed.png b/docs/build/html/_static/down-pressed.png new file mode 100755 index 00000000..5756c8ca Binary files /dev/null and b/docs/build/html/_static/down-pressed.png differ diff --git a/docs/build/html/_static/down.png b/docs/build/html/_static/down.png new file mode 100755 index 00000000..1b3bdad2 Binary files /dev/null and b/docs/build/html/_static/down.png differ diff --git a/docs/build/html/_static/file.png b/docs/build/html/_static/file.png new file 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accentuates the need for the creation of a real `window`. + // e.g. var jQuery = require("jquery")(window); + // See ticket #14549 for more info. + module.exports = global.document ? + factory( global, true ) : + function( w ) { + if ( !w.document ) { + throw new Error( "jQuery requires a window with a document" ); + } + return factory( w ); + }; + } else { + factory( global ); + } + +// Pass this if window is not defined yet +} )( typeof window !== "undefined" ? window : this, function( window, noGlobal ) { + +// Edge <= 12 - 13+, Firefox <=18 - 45+, IE 10 - 11, Safari 5.1 - 9+, iOS 6 - 9.1 +// throw exceptions when non-strict code (e.g., ASP.NET 4.5) accesses strict mode +// arguments.callee.caller (trac-13335). But as of jQuery 3.0 (2016), strict mode should be common +// enough that all such attempts are guarded in a try block. +"use strict"; + +var arr = []; + +var document = window.document; + +var getProto = Object.getPrototypeOf; + +var slice = arr.slice; + +var concat = arr.concat; + +var push = arr.push; + +var indexOf = arr.indexOf; + +var class2type = {}; + +var toString = class2type.toString; + +var hasOwn = class2type.hasOwnProperty; + +var fnToString = hasOwn.toString; + +var ObjectFunctionString = fnToString.call( Object ); + +var support = {}; + + + + function DOMEval( code, doc ) { + doc = doc || document; + + var script = doc.createElement( "script" ); + + script.text = code; + doc.head.appendChild( script ).parentNode.removeChild( script ); + } +/* global Symbol */ +// Defining this global in .eslintrc would create a danger of using the global +// unguarded in another place, it seems safer to define global only for this module + + + +var + version = "3.1.0", + + // Define a local copy of jQuery + jQuery = function( selector, context ) { + + // The jQuery object is actually just the init constructor 'enhanced' + // Need init if jQuery is called (just allow error to be thrown if not included) + return new jQuery.fn.init( selector, context ); + }, + + // Support: Android <=4.0 only + // Make sure we trim BOM and NBSP + rtrim = /^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g, + + // Matches dashed string for camelizing + rmsPrefix = /^-ms-/, + rdashAlpha = /-([a-z])/g, + + // Used by jQuery.camelCase as callback to replace() + fcamelCase = function( all, letter ) { + return letter.toUpperCase(); + }; + +jQuery.fn = jQuery.prototype = { + + // The current version of jQuery being used + jquery: version, + + constructor: jQuery, + + // The default length of a jQuery object is 0 + length: 0, + + toArray: function() { + return slice.call( this ); + }, + + // Get the Nth element in the matched element set OR + // Get the whole matched element set as a clean array + get: function( num ) { + return num != null ? + + // Return just the one element from the set + ( num < 0 ? this[ num + this.length ] : this[ num ] ) : + + // Return all the elements in a clean array + slice.call( this ); + }, + + // Take an array of elements and push it onto the stack + // (returning the new matched element set) + pushStack: function( elems ) { + + // Build a new jQuery matched element set + var ret = jQuery.merge( this.constructor(), elems ); + + // Add the old object onto the stack (as a reference) + ret.prevObject = this; + + // Return the newly-formed element set + return ret; + }, + + // Execute a callback for every element in the matched set. + each: function( callback ) { + return jQuery.each( this, callback ); + }, + + map: function( callback ) { + return this.pushStack( jQuery.map( this, function( elem, i ) { + return callback.call( elem, i, elem ); + } ) ); + }, + + slice: function() { + return this.pushStack( slice.apply( this, arguments ) ); + }, + + first: function() { + return this.eq( 0 ); + }, + + last: function() { + return this.eq( -1 ); + }, + + eq: function( i ) { + var len = this.length, + j = +i + ( i < 0 ? len : 0 ); + return this.pushStack( j >= 0 && j < len ? [ this[ j ] ] : [] ); + }, + + end: function() { + return this.prevObject || this.constructor(); + }, + + // For internal use only. + // Behaves like an Array's method, not like a jQuery method. + push: push, + sort: arr.sort, + splice: arr.splice +}; + +jQuery.extend = jQuery.fn.extend = function() { + var options, name, src, copy, copyIsArray, clone, + target = arguments[ 0 ] || {}, + i = 1, + length = arguments.length, + deep = false; + + // Handle a deep copy situation + if ( typeof target === "boolean" ) { + deep = target; + + // Skip the boolean and the target + target = arguments[ i ] || {}; + i++; + } + + // Handle case when target is a string or something (possible in deep copy) + if ( typeof target !== "object" && !jQuery.isFunction( target ) ) { + target = {}; + } + + // Extend jQuery itself if only one argument is passed + if ( i === length ) { + target = this; + i--; + } + + for ( ; i < length; i++ ) { + + // Only deal with non-null/undefined values + if ( ( options = arguments[ i ] ) != null ) { + + // Extend the base object + for ( name in options ) { + src = target[ name ]; + copy = options[ name ]; + + // Prevent never-ending loop + if ( target === copy ) { + continue; + } + + // Recurse if we're merging plain objects or arrays + if ( deep && copy && ( jQuery.isPlainObject( copy ) || + ( copyIsArray = jQuery.isArray( copy ) ) ) ) { + + if ( copyIsArray ) { + copyIsArray = false; + clone = src && jQuery.isArray( src ) ? src : []; + + } else { + clone = src && jQuery.isPlainObject( src ) ? src : {}; + } + + // Never move original objects, clone them + target[ name ] = jQuery.extend( deep, clone, copy ); + + // Don't bring in undefined values + } else if ( copy !== undefined ) { + target[ name ] = copy; + } + } + } + } + + // Return the modified object + return target; +}; + +jQuery.extend( { + + // Unique for each copy of jQuery on the page + expando: "jQuery" + ( version + Math.random() ).replace( /\D/g, "" ), + + // Assume jQuery is ready without the ready module + isReady: true, + + error: function( msg ) { + throw new Error( msg ); + }, + + noop: function() {}, + + isFunction: function( obj ) { + return jQuery.type( obj ) === "function"; + }, + + isArray: Array.isArray, + + isWindow: function( obj ) { + return obj != null && obj === obj.window; + }, + + isNumeric: function( obj ) { + + // As of jQuery 3.0, isNumeric is limited to + // strings and numbers (primitives or objects) + // that can be coerced to finite numbers (gh-2662) + var type = jQuery.type( obj ); + return ( type === "number" || type === "string" ) && + + // parseFloat NaNs numeric-cast false positives ("") + // ...but misinterprets leading-number strings, particularly hex literals ("0x...") + // subtraction forces infinities to NaN + !isNaN( obj - parseFloat( obj ) ); + }, + + isPlainObject: function( obj ) { + var proto, Ctor; + + // Detect obvious negatives + // Use toString instead of jQuery.type to catch host objects + if ( !obj || toString.call( obj ) !== "[object Object]" ) { + return false; + } + + proto = getProto( obj ); + + // Objects with no prototype (e.g., `Object.create( null )`) are plain + if ( !proto ) { + return true; + } + + // Objects with prototype are plain iff they were constructed by a global Object function + Ctor = hasOwn.call( proto, "constructor" ) && proto.constructor; + return typeof Ctor === "function" && fnToString.call( Ctor ) === ObjectFunctionString; + }, + + isEmptyObject: function( obj ) { + + /* eslint-disable no-unused-vars */ + // See https://github.com/eslint/eslint/issues/6125 + var name; + + for ( name in obj ) { + return false; + } + return true; + }, + + type: function( obj ) { + if ( obj == null ) { + return obj + ""; + } + + // Support: Android <=2.3 only (functionish RegExp) + return typeof obj === "object" || typeof obj === "function" ? + class2type[ toString.call( obj ) ] || "object" : + typeof obj; + }, + + // Evaluates a script in a global context + globalEval: function( code ) { + DOMEval( code ); + }, + + // Convert dashed to camelCase; used by the css and data modules + // Support: IE <=9 - 11, Edge 12 - 13 + // Microsoft forgot to hump their vendor prefix (#9572) + camelCase: function( string ) { + return string.replace( rmsPrefix, "ms-" ).replace( rdashAlpha, fcamelCase ); + }, + + nodeName: function( elem, name ) { + return elem.nodeName && elem.nodeName.toLowerCase() === name.toLowerCase(); + }, + + each: function( obj, callback ) { + var length, i = 0; + + if ( isArrayLike( obj ) ) { + length = obj.length; + for ( ; i < length; i++ ) { + if ( callback.call( obj[ i ], i, obj[ i ] ) === false ) { + break; + } + } + } else { + for ( i in obj ) { + if ( callback.call( obj[ i ], i, obj[ i ] ) === false ) { + break; + } + } + } + + return obj; + }, + + // Support: Android <=4.0 only + trim: function( text ) { + return text == null ? + "" : + ( text + "" ).replace( rtrim, "" ); + }, + + // results is for internal usage only + makeArray: function( arr, results ) { + var ret = results || []; + + if ( arr != null ) { + if ( isArrayLike( Object( arr ) ) ) { + jQuery.merge( ret, + typeof arr === "string" ? + [ arr ] : arr + ); + } else { + push.call( ret, arr ); + } + } + + return ret; + }, + + inArray: function( elem, arr, i ) { + return arr == null ? -1 : indexOf.call( arr, elem, i ); + }, + + // Support: Android <=4.0 only, PhantomJS 1 only + // push.apply(_, arraylike) throws on ancient WebKit + merge: function( first, second ) { + var len = +second.length, + j = 0, + i = first.length; + + for ( ; j < len; j++ ) { + first[ i++ ] = second[ j ]; + } + + first.length = i; + + return first; + }, + + grep: function( elems, callback, invert ) { + var callbackInverse, + matches = [], + i = 0, + length = elems.length, + callbackExpect = !invert; + + // Go through the array, only saving the items + // that pass the validator function + for ( ; i < length; i++ ) { + callbackInverse = !callback( elems[ i ], i ); + if ( callbackInverse !== callbackExpect ) { + matches.push( elems[ i ] ); + } + } + + return matches; + }, + + // arg is for internal usage only + map: function( elems, callback, arg ) { + var length, value, + i = 0, + ret = []; + + // Go through the array, translating each of the items to their new values + if ( isArrayLike( elems ) ) { + length = elems.length; + for ( ; i < length; i++ ) { + value = callback( elems[ i ], i, arg ); + + if ( value != null ) { + ret.push( value ); + } + } + + // Go through every key on the object, + } else { + for ( i in elems ) { + value = callback( elems[ i ], i, arg ); + + if ( value != null ) { + ret.push( value ); + } + } + } + + // Flatten any nested arrays + return concat.apply( [], ret ); + }, + + // A global GUID counter for objects + guid: 1, + + // Bind a function to a context, optionally partially applying any + // arguments. + proxy: function( fn, context ) { + var tmp, args, proxy; + + if ( typeof context === "string" ) { + tmp = fn[ context ]; + context = fn; + fn = tmp; + } + + // Quick check to determine if target is callable, in the spec + // this throws a TypeError, but we will just return undefined. + if ( !jQuery.isFunction( fn ) ) { + return undefined; + } + + // Simulated bind + args = slice.call( arguments, 2 ); + proxy = function() { + return fn.apply( context || this, args.concat( slice.call( arguments ) ) ); + }; + + // Set the guid of unique handler to the same of original handler, so it can be removed + proxy.guid = fn.guid = fn.guid || jQuery.guid++; + + return proxy; + }, + + now: Date.now, + + // jQuery.support is not used in Core but other projects attach their + // properties to it so it needs to exist. + support: support +} ); + +if ( typeof Symbol === "function" ) { + jQuery.fn[ Symbol.iterator ] = arr[ Symbol.iterator ]; +} + +// Populate the class2type map +jQuery.each( "Boolean Number String Function Array Date RegExp Object Error Symbol".split( " " ), +function( i, name ) { + class2type[ "[object " + name + "]" ] = name.toLowerCase(); +} ); + +function isArrayLike( obj ) { + + // Support: real iOS 8.2 only (not reproducible in simulator) + // `in` check used to prevent JIT error (gh-2145) + // hasOwn isn't used here due to false negatives + // regarding Nodelist length in IE + var length = !!obj && "length" in obj && obj.length, + type = jQuery.type( obj ); + + if ( type === "function" || jQuery.isWindow( obj ) ) { + return false; + } + + return type === "array" || length === 0 || + typeof length === "number" && length > 0 && ( length - 1 ) in obj; +} +var Sizzle = +/*! + * Sizzle CSS Selector Engine v2.3.0 + * https://sizzlejs.com/ + * + * Copyright jQuery Foundation and other contributors + * Released under the MIT license + * http://jquery.org/license + * + * Date: 2016-01-04 + */ +(function( window ) { + +var i, + support, + Expr, + getText, + isXML, + tokenize, + compile, + select, + outermostContext, + sortInput, + hasDuplicate, + + // Local document vars + setDocument, + document, + docElem, + documentIsHTML, + rbuggyQSA, + rbuggyMatches, + matches, + contains, + + // Instance-specific data + expando = "sizzle" + 1 * new Date(), + preferredDoc = window.document, + dirruns = 0, + done = 0, + classCache = createCache(), + tokenCache = createCache(), + compilerCache = createCache(), + sortOrder = function( a, b ) { + if ( a === b ) { + hasDuplicate = true; + } + return 0; + }, + + // Instance methods + hasOwn = ({}).hasOwnProperty, + arr = [], + pop = arr.pop, + push_native = arr.push, + push = arr.push, + slice = arr.slice, + // Use a stripped-down indexOf as it's faster than native + // https://jsperf.com/thor-indexof-vs-for/5 + indexOf = function( list, elem ) { + var i = 0, + len = list.length; + for ( ; i < len; i++ ) { + if ( list[i] === elem ) { + return i; + } + } + return -1; + }, + + booleans = "checked|selected|async|autofocus|autoplay|controls|defer|disabled|hidden|ismap|loop|multiple|open|readonly|required|scoped", + + // Regular expressions + + // http://www.w3.org/TR/css3-selectors/#whitespace + whitespace = "[\\x20\\t\\r\\n\\f]", + + // http://www.w3.org/TR/CSS21/syndata.html#value-def-identifier + identifier = "(?:\\\\.|[\\w-]|[^\0-\\xa0])+", + + // Attribute selectors: http://www.w3.org/TR/selectors/#attribute-selectors + attributes = "\\[" + whitespace + "*(" + identifier + ")(?:" + whitespace + + // Operator (capture 2) + "*([*^$|!~]?=)" + whitespace + + // "Attribute values must be CSS identifiers [capture 5] or strings [capture 3 or capture 4]" + "*(?:'((?:\\\\.|[^\\\\'])*)'|\"((?:\\\\.|[^\\\\\"])*)\"|(" + identifier + "))|)" + whitespace + + "*\\]", + + pseudos = ":(" + identifier + ")(?:\\((" + + // To reduce the number of selectors needing tokenize in the preFilter, prefer arguments: + // 1. quoted (capture 3; capture 4 or capture 5) + "('((?:\\\\.|[^\\\\'])*)'|\"((?:\\\\.|[^\\\\\"])*)\")|" + + // 2. simple (capture 6) + "((?:\\\\.|[^\\\\()[\\]]|" + attributes + ")*)|" + + // 3. anything else (capture 2) + ".*" + + ")\\)|)", + + // Leading and non-escaped trailing whitespace, capturing some non-whitespace characters preceding the latter + rwhitespace = new RegExp( whitespace + "+", "g" ), + rtrim = new RegExp( "^" + whitespace + "+|((?:^|[^\\\\])(?:\\\\.)*)" + whitespace + "+$", "g" ), + + rcomma = new RegExp( "^" + whitespace + "*," + whitespace + "*" ), + rcombinators = new RegExp( "^" + whitespace + "*([>+~]|" + whitespace + ")" + whitespace + "*" ), + + rattributeQuotes = new RegExp( "=" + whitespace + "*([^\\]'\"]*?)" + whitespace + "*\\]", "g" ), + + rpseudo = new RegExp( pseudos ), + ridentifier = new RegExp( "^" + identifier + "$" ), + + matchExpr = { + "ID": new RegExp( "^#(" + identifier + ")" ), + "CLASS": new RegExp( "^\\.(" + identifier + ")" ), + "TAG": new RegExp( "^(" + identifier + "|[*])" ), + "ATTR": new RegExp( "^" + attributes ), + "PSEUDO": new RegExp( "^" + pseudos ), + "CHILD": new RegExp( "^:(only|first|last|nth|nth-last)-(child|of-type)(?:\\(" + whitespace + + "*(even|odd|(([+-]|)(\\d*)n|)" + whitespace + "*(?:([+-]|)" + whitespace + + "*(\\d+)|))" + whitespace + "*\\)|)", "i" ), + "bool": new RegExp( "^(?:" + booleans + ")$", "i" ), + // For use in libraries implementing .is() + // We use this for POS matching in `select` + "needsContext": new RegExp( "^" + whitespace + "*[>+~]|:(even|odd|eq|gt|lt|nth|first|last)(?:\\(" + + whitespace + "*((?:-\\d)?\\d*)" + whitespace + "*\\)|)(?=[^-]|$)", "i" ) + }, + + rinputs = /^(?:input|select|textarea|button)$/i, + rheader = /^h\d$/i, + + rnative = /^[^{]+\{\s*\[native \w/, + + // Easily-parseable/retrievable ID or TAG or CLASS selectors + rquickExpr = /^(?:#([\w-]+)|(\w+)|\.([\w-]+))$/, + + rsibling = /[+~]/, + + // CSS escapes + // http://www.w3.org/TR/CSS21/syndata.html#escaped-characters + runescape = new RegExp( "\\\\([\\da-f]{1,6}" + whitespace + "?|(" + whitespace + ")|.)", "ig" ), + funescape = function( _, escaped, escapedWhitespace ) { + var high = "0x" + escaped - 0x10000; + // NaN means non-codepoint + // Support: Firefox<24 + // Workaround erroneous numeric interpretation of +"0x" + return high !== high || escapedWhitespace ? + escaped : + high < 0 ? + // BMP codepoint + String.fromCharCode( high + 0x10000 ) : + // Supplemental Plane codepoint (surrogate pair) + String.fromCharCode( high >> 10 | 0xD800, high & 0x3FF | 0xDC00 ); + }, + + // CSS string/identifier serialization + // https://drafts.csswg.org/cssom/#common-serializing-idioms + rcssescape = /([\0-\x1f\x7f]|^-?\d)|^-$|[^\x80-\uFFFF\w-]/g, + fcssescape = function( ch, asCodePoint ) { + if ( asCodePoint ) { + + // U+0000 NULL becomes U+FFFD REPLACEMENT CHARACTER + if ( ch === "\0" ) { + return "\uFFFD"; + } + + // Control characters and (dependent upon position) numbers get escaped as code points + return ch.slice( 0, -1 ) + "\\" + ch.charCodeAt( ch.length - 1 ).toString( 16 ) + " "; + } + + // Other potentially-special ASCII characters get backslash-escaped + return "\\" + ch; + }, + + // Used for iframes + // See setDocument() + // Removing the function wrapper causes a "Permission Denied" + // error in IE + unloadHandler = function() { + setDocument(); + }, + + disabledAncestor = addCombinator( + function( elem ) { + return elem.disabled === true; + }, + { dir: "parentNode", next: "legend" } + ); + +// Optimize for push.apply( _, NodeList ) +try { + push.apply( + (arr = slice.call( preferredDoc.childNodes )), + preferredDoc.childNodes + ); + // Support: Android<4.0 + // Detect silently failing push.apply + arr[ preferredDoc.childNodes.length ].nodeType; +} catch ( e ) { + push = { apply: arr.length ? + + // Leverage slice if possible + function( target, els ) { + push_native.apply( target, slice.call(els) ); + } : + + // Support: IE<9 + // Otherwise append directly + function( target, els ) { + var j = target.length, + i = 0; + // Can't trust NodeList.length + while ( (target[j++] = els[i++]) ) {} + target.length = j - 1; + } + }; +} + +function Sizzle( selector, context, results, seed ) { + var m, i, elem, nid, match, groups, newSelector, + newContext = context && context.ownerDocument, + + // nodeType defaults to 9, since context defaults to document + nodeType = context ? context.nodeType : 9; + + results = results || []; + + // Return early from calls with invalid selector or context + if ( typeof selector !== "string" || !selector || + nodeType !== 1 && nodeType !== 9 && nodeType !== 11 ) { + + return results; + } + + // Try to shortcut find operations (as opposed to filters) in HTML documents + if ( !seed ) { + + if ( ( context ? context.ownerDocument || context : preferredDoc ) !== document ) { + setDocument( context ); + } + context = context || document; + + if ( documentIsHTML ) { + + // If the selector is sufficiently simple, try using a "get*By*" DOM method + // (excepting DocumentFragment context, where the methods don't exist) + if ( nodeType !== 11 && (match = rquickExpr.exec( selector )) ) { + + // ID selector + if ( (m = match[1]) ) { + + // Document context + if ( nodeType === 9 ) { + if ( (elem = context.getElementById( m )) ) { + + // Support: IE, Opera, Webkit + // TODO: identify versions + // getElementById can match elements by name instead of ID + if ( elem.id === m ) { + results.push( elem ); + return results; + } + } else { + return results; + } + + // Element context + } else { + + // Support: IE, Opera, Webkit + // TODO: identify versions + // getElementById can match elements by name instead of ID + if ( newContext && (elem = newContext.getElementById( m )) && + contains( context, elem ) && + elem.id === m ) { + + results.push( elem ); + return results; + } + } + + // Type selector + } else if ( match[2] ) { + push.apply( results, context.getElementsByTagName( selector ) ); + return results; + + // Class selector + } else if ( (m = match[3]) && support.getElementsByClassName && + context.getElementsByClassName ) { + + push.apply( results, context.getElementsByClassName( m ) ); + return results; + } + } + + // Take advantage of querySelectorAll + if ( support.qsa && + !compilerCache[ selector + " " ] && + (!rbuggyQSA || !rbuggyQSA.test( selector )) ) { + + if ( nodeType !== 1 ) { + newContext = context; + newSelector = selector; + + // qSA looks outside Element context, which is not what we want + // Thanks to Andrew Dupont for this workaround technique + // Support: IE <=8 + // Exclude object elements + } else if ( context.nodeName.toLowerCase() !== "object" ) { + + // Capture the context ID, setting it first if necessary + if ( (nid = context.getAttribute( "id" )) ) { + nid = nid.replace( rcssescape, fcssescape ); + } else { + context.setAttribute( "id", (nid = expando) ); + } + + // Prefix every selector in the list + groups = tokenize( selector ); + i = groups.length; + while ( i-- ) { + groups[i] = "#" + nid + " " + toSelector( groups[i] ); + } + newSelector = groups.join( "," ); + + // Expand context for sibling selectors + newContext = rsibling.test( selector ) && testContext( context.parentNode ) || + context; + } + + if ( newSelector ) { + try { + push.apply( results, + newContext.querySelectorAll( newSelector ) + ); + return results; + } catch ( qsaError ) { + } finally { + if ( nid === expando ) { + context.removeAttribute( "id" ); + } + } + } + } + } + } + + // All others + return select( selector.replace( rtrim, "$1" ), context, results, seed ); +} + +/** + * Create key-value caches of limited size + * @returns {function(string, object)} Returns the Object data after storing it on itself with + * property name the (space-suffixed) string and (if the cache is larger than Expr.cacheLength) + * deleting the oldest entry + */ +function createCache() { + var keys = []; + + function cache( key, value ) { + // Use (key + " ") to avoid collision with native prototype properties (see Issue #157) + if ( keys.push( key + " " ) > Expr.cacheLength ) { + // Only keep the most recent entries + delete cache[ keys.shift() ]; + } + return (cache[ key + " " ] = value); + } + return cache; +} + +/** + * Mark a function for special use by Sizzle + * @param {Function} fn The function to mark + */ +function markFunction( fn ) { + fn[ expando ] = true; + return fn; +} + +/** + * Support testing using an element + * @param {Function} fn Passed the created element and returns a boolean result + */ +function assert( fn ) { + var el = document.createElement("fieldset"); + + try { + return !!fn( el ); + } catch (e) { + return false; + } finally { + // Remove from its parent by default + if ( el.parentNode ) { + el.parentNode.removeChild( el ); + } + // release memory in IE + el = null; + } +} + +/** + * Adds the same handler for all of the specified attrs + * @param {String} attrs Pipe-separated list of attributes + * @param {Function} handler The method that will be applied + */ +function addHandle( attrs, handler ) { + var arr = attrs.split("|"), + i = arr.length; + + while ( i-- ) { + Expr.attrHandle[ arr[i] ] = handler; + } +} + +/** + * Checks document order of two siblings + * @param {Element} a + * @param {Element} b + * @returns {Number} Returns less than 0 if a precedes b, greater than 0 if a follows b + */ +function siblingCheck( a, b ) { + var cur = b && a, + diff = cur && a.nodeType === 1 && b.nodeType === 1 && + a.sourceIndex - b.sourceIndex; + + // Use IE sourceIndex if available on both nodes + if ( diff ) { + return diff; + } + + // Check if b follows a + if ( cur ) { + while ( (cur = cur.nextSibling) ) { + if ( cur === b ) { + return -1; + } + } + } + + return a ? 1 : -1; +} + +/** + * Returns a function to use in pseudos for input types + * @param {String} type + */ +function createInputPseudo( type ) { + return function( elem ) { + var name = elem.nodeName.toLowerCase(); + return name === "input" && elem.type === type; + }; +} + +/** + * Returns a function to use in pseudos for buttons + * @param {String} type + */ +function createButtonPseudo( type ) { + return function( elem ) { + var name = elem.nodeName.toLowerCase(); + return (name === "input" || name === "button") && elem.type === type; + }; +} + +/** + * Returns a function to use in pseudos for :enabled/:disabled + * @param {Boolean} disabled true for :disabled; false for :enabled + */ +function createDisabledPseudo( disabled ) { + // Known :disabled false positives: + // IE: *[disabled]:not(button, input, select, textarea, optgroup, option, menuitem, fieldset) + // not IE: fieldset[disabled] > legend:nth-of-type(n+2) :can-disable + return function( elem ) { + + // Check form elements and option elements for explicit disabling + return "label" in elem && elem.disabled === disabled || + "form" in elem && elem.disabled === disabled || + + // Check non-disabled form elements for fieldset[disabled] ancestors + "form" in elem && elem.disabled === false && ( + // Support: IE6-11+ + // Ancestry is covered for us + elem.isDisabled === disabled || + + // Otherwise, assume any non-