api.php
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	<?php

	/*
	* Copyright 2012 Facebook, Inc.
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	/**
	* Include a CSS or JS static resource by name. This function records a
	* dependency for the current page, so when a response is generated it can be
	* included. You can call this method from any context, and it is recommended
	* you invoke it as close to the actual dependency as possible so that page
	* dependencies are minimized.
	*
	* For more information, see @{article:Adding New CSS and JS}.
	*
	* @param string Name of the celerity module to include. This is whatever you
	* annotated as "@provides" in the file.
	* @return void
	*
	* @group celerity
	*/
	function require_celerity_resource($symbol) {
	$response = CelerityAPI::getStaticResourceResponse();
	$response->requireResource($symbol);
	}


	/**
	* Generate a node ID which is guaranteed to be unique for the current page,
	* even across Ajax requests. You should use this method to generate IDs for
	* nodes which require a uniqueness guarantee.
	*
	* @return string A string appropriate for use as an 'id' attribute on a DOM
	* node. It is guaranteed to be unique for the current page, even
	* if the current request is a subsequent Ajax request.
	*
	* @group celerity
	*/
	function celerity_generate_unique_node_id() {
	static $uniq = 0;
	$response = CelerityAPI::getStaticResourceResponse();
	$block = $response->getMetadataBlock();

	return 'UQ'.$block.'_'.($uniq++);
	}


	/**
	* Get the versioned URI for a raw resource, like an image.
	*
	* @param string Path to the raw image.
	* @return string Versioned path to the image, if one is available.
	*
	* @group celerity
	*/
	function celerity_get_resource_uri($resource) {
	$map = CelerityResourceMap::getInstance();

	$info = $map->lookupFileInformation($resource);
	if ($info) {
	return $info['uri'];
	} else {
	return $resource;
	}
	}

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