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library/Zend/View/Helper/TinySrc.php
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317
library/Zend/View/Helper/TinySrc.php
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<?php
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/**
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* Zend Framework
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* It is also available through the world-wide-web at this URL:
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* http://framework.zend.com/license/new-bsd
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to license@zend.com so we can send you a copy immediately.
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*
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* @category Zend
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* @package Zend_View
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* @subpackage Helper
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* @copyright Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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/** Zend_View_Helper_HtmlElement */
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require_once 'Zend/View/Helper/HtmlElement.php';
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/**
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* Helper for generating urls and/or image tags for use with tinysrc.net
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*
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* tinysrc.net provides an API for generating scaled, browser device-specific
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* images. In essence, you pass the API the URL to an image on your own server,
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* and tinysrc.net then provides the appropriate image based on the device that
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* accesses it.
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*
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* Additionally, tinysrc.net allows you to specify additional configuration via
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* the API:
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*
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* - image size. You may define this as:
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* - explicit size
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* - subtractive size (size of screen minus specified number of pixels)
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* - percentage size (percentage of screen size))
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* - image format. This will convert the image to the given format; allowed
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* values are "png" or "jpeg". By default, gif images are converted to png.
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*
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* This helper allows you to specify all configuration options, as well as:
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*
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* - whether or not to generate the full image tag (or just the URL)
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* - base url to images (which should include the protocol, server, and
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* optionally port and base path)
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*
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* @see http://tinysrc.net/
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* @package Zend_View
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* @subpackage Helper
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* @copyright Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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class Zend_View_Helper_TinySrc extends Zend_View_Helper_HtmlElement
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{
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const TINYSRC_BASE = 'http://i.tinysrc.mobi';
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/**
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* @var string Base URL for images
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*/
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protected $_baseUrl;
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/**
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* @var bool Whether or not to create an image tag
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*/
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protected $_createTagFlag = true;
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/**
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* @var string Default width and height
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*/
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protected $_dimensions = '';
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/**
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* Default options
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*
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* Used when determining what options were passed, and needing to merge
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* them with default options.
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*
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* @var array
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*/
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protected $_defaultOptions = array(
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'base_url' => null,
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'format' => null,
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'width' => false,
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'height' => false,
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'create_tag' => true,
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);
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/**
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* @var string Default image format to use
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*/
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protected $_format = '';
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/**
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* Generate a link or image tag pointing to tinysrc.net
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*
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* @param mixed $image
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* @param array $options
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* @return void
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*/
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public function tinySrc($image = null, array $options = array())
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{
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if (null === $image) {
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return $this;
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}
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$defaultOptions = $this->_defaultOptions;
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$defaultOptions['create_tag'] = $this->createTag();
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$options = array_merge($defaultOptions, $options);
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$url = '/' . $this->_mergeBaseUrl($options) . ltrim($image, '/');
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$src = self::TINYSRC_BASE
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. $this->_mergeFormat($options)
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. $this->_mergeDimensions($options)
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. $url;
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if (!$options['create_tag']) {
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return $src;
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}
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foreach (array_keys($this->_defaultOptions) as $key) {
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switch ($key) {
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case 'width':
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case 'height':
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if (!is_int($options[$key]) || !is_numeric($options[$key]) || $options[$key] < 0) {
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unset($options[$key]);
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}
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break;
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default:
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unset($options[$key]);
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break;
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}
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}
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$options['src'] = $src;
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$tag = '<img' . $this->_htmlAttribs($options) . $this->getClosingBracket();
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return $tag;
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}
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/**
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* Set base URL for images
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*
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* @param string $url
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* @return Zend_View_Helper_TinySrc
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*/
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public function setBaseUrl($url)
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{
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$this->_baseUrl = rtrim($url, '/') . '/';
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return $this;
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}
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/**
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* Get base URL for images
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*
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* If none already set, uses the ServerUrl and BaseUrl view helpers to
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* determine the base URL to images.
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*
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* @return string
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*/
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public function getBaseUrl()
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{
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if (null === $this->_baseUrl) {
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$this->setBaseUrl($this->view->serverUrl($this->view->baseUrl()));
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}
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return $this->_baseUrl;
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}
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/**
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* Set default image format
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*
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* If set, this will set the default format to use on all images.
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*
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* @param null|string $format
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* @return Zend_View_Helper_TinySrc
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* @throws Zend_View_Exception
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*/
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public function setDefaultFormat($format = null)
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{
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if (null === $format) {
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$this->_format = '';
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return $this;
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}
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$format = strtolower($format);
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if (!in_array($format, array('png', 'jpeg'))) {
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require_once 'Zend/View/Exception.php';
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throw new Zend_View_Exception('Invalid format; must be one of "jpeg" or "png"');
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}
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$this->_format = "/$format";
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return $this;
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}
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/**
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* Set default dimensions
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*
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* If null is specified for width, default dimensions will be cleared. If
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* only width is specified, only width will be used. If either dimension
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* fails validation, an exception is raised.
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*
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* @param null|int|string $width
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* @param null|int|string $height
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* @return Zend_View_Helper_TinySrc
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* @throws Zend_View_Exception
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*/
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public function setDefaultDimensions($width = null, $height = null)
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{
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if (null === $width) {
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$this->_dimensions = '';
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return $this;
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}
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if (!$this->_validateDimension($width)) {
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require_once 'Zend/View/Exception.php';
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throw new Zend_View_Exception('Invalid dimension; must be an integer, optionally preceded by "-" or "x"');
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}
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$this->_dimensions = "/$width";
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if (null === $height) {
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return $this;
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}
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if (!$this->_validateDimension($height)) {
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require_once 'Zend/View/Exception.php';
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throw new Zend_View_Exception('Invalid dimension; must be an integer, optionally preceded by "-" or "x"');
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}
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$this->_dimensions .= "/$height";
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return $this;
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}
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/**
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* Set state of "create tag" flag
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*
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* @param bool $flag
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* @return Zend_View_Helper_TinySrc
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*/
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public function setCreateTag($flag)
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{
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$this->_createTagFlag = (bool) $flag;
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return $this;
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}
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/**
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* Should the helper create an image tag?
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*
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* @return bool
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*/
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public function createTag()
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{
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return $this->_createTagFlag;
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}
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/**
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* Validate a dimension
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*
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* Dimensions may be integers, optionally preceded by '-' or 'x'.
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*
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* @param string $dim
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* @return bool
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*/
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protected function _validateDimension($dim)
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{
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if (!is_scalar($dim) || is_bool($dim)) {
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return false;
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}
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return preg_match('/^(-|x)?\d+$/', (string) $dim);
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}
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/**
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* Determine whether to use default base URL, or base URL from options
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*
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* @param array $options
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* @return string
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*/
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protected function _mergeBaseUrl(array $options)
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{
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if (null === $options['base_url']) {
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return $this->getBaseUrl();
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}
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return rtrim($options['base_url'], '/') . '/';
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}
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/**
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* Determine whether to use default format or format provided in options.
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*
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* @param array $options
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* @return string
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*/
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protected function _mergeFormat(array $options)
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{
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if (in_array($options['format'], array('png', 'jpeg'))) {
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return '/' . $options['format'];
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}
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return $this->_format;
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}
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/**
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* Determine whether to use default dimensions, or those passed in options.
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*
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* @param array $options
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* @return string
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*/
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protected function _mergeDimensions(array $options)
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{
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if (!$this->_validateDimension($options['width'])) {
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return $this->_dimensions;
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}
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$dimensions = '/' . $options['width'];
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if (!$this->_validateDimension($options['height'])) {
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return $dimensions;
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}
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$dimensions .= '/' . $options['height'];
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return $dimensions;
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}
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}
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