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<?php
/**
* ResourceLoader module for generated and embedded images.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @author Trevor Parscal
*/
/**
* ResourceLoader module for generated and embedded images.
*
* @since 1.25
*/
class ResourceLoaderImageModule extends ResourceLoaderModule {
protected $definition = null;
/**
* Local base path, see __construct()
* @var string
*/
protected $localBasePath = '';
protected $origin = self::ORIGIN_CORE_SITEWIDE;
protected $images = [];
protected $variants = [];
protected $prefix = null;
protected $selectorWithoutVariant = '.{prefix}-{name}';
protected $selectorWithVariant = '.{prefix}-{name}-{variant}';
protected $targets = [ 'desktop', 'mobile' ];
/** @var string Position on the page to load this module at */
protected $position = 'bottom';
/**
* Constructs a new module from an options array.
*
* @param array $options List of options; if not given or empty, an empty module will be
* constructed
* @param string $localBasePath Base path to prepend to all local paths in $options. Defaults
* to $IP
*
* Below is a description for the $options array:
* @par Construction options:
* @code
* array(
* // Base path to prepend to all local paths in $options. Defaults to $IP
* 'localBasePath' => [base path],
* // Path to JSON file that contains any of the settings below
* 'data' => [file path string]
* // CSS class prefix to use in all style rules
* 'prefix' => [CSS class prefix],
* // Alternatively: Format of CSS selector to use in all style rules
* 'selector' => [CSS selector template, variables: {prefix} {name} {variant}],
* // Alternatively: When using variants
* 'selectorWithoutVariant' => [CSS selector template, variables: {prefix} {name}],
* 'selectorWithVariant' => [CSS selector template, variables: {prefix} {name} {variant}],
* // List of variants that may be used for the image files
* 'variants' => array(
* [theme name] => array(
* [variant name] => array(
* 'color' => [color string, e.g. '#ffff00'],
* 'global' => [boolean, if true, this variant is available
* for all images of this type],
* ),
* ...
* ),
* ...
* ),
* // List of image files and their options
* 'images' => array(
* [theme name] => array(
* [icon name] => array(
* 'file' => [file path string or array whose values are file path strings
* and whose keys are 'default', 'ltr', 'rtl', a single
* language code like 'en', or a list of language codes like
* 'en,de,ar'],
* 'variants' => [array of variant name strings, variants
* available for this image],
* ),
* ...
* ),
* ...
* ),
* )
* @endcode
* @throws InvalidArgumentException
*/
public function __construct( $options = [], $localBasePath = null ) {
$this->localBasePath = self::extractLocalBasePath( $options, $localBasePath );
$this->definition = $options;
}
/**
* Parse definition and external JSON data, if referenced.
*/
protected function loadFromDefinition() {
if ( $this->definition === null ) {
return;
}
$options = $this->definition;
$this->definition = null;
if ( isset( $options['data'] ) ) {
$dataPath = $this->localBasePath . '/' . $options['data'];
$data = json_decode( file_get_contents( $dataPath ), true );
$options = array_merge( $data, $options );
}
// Accepted combinations:
// * prefix
// * selector
// * selectorWithoutVariant + selectorWithVariant
// * prefix + selector
// * prefix + selectorWithoutVariant + selectorWithVariant
$prefix = isset( $options['prefix'] ) && $options['prefix'];
$selector = isset( $options['selector'] ) && $options['selector'];
$selectorWithoutVariant = isset( $options['selectorWithoutVariant'] )
&& $options['selectorWithoutVariant'];
$selectorWithVariant = isset( $options['selectorWithVariant'] )
&& $options['selectorWithVariant'];
if ( $selectorWithoutVariant && !$selectorWithVariant ) {
throw new InvalidArgumentException(
"Given 'selectorWithoutVariant' but no 'selectorWithVariant'."
);
}
if ( $selectorWithVariant && !$selectorWithoutVariant ) {
throw new InvalidArgumentException(
"Given 'selectorWithVariant' but no 'selectorWithoutVariant'."
);
}
if ( $selector && $selectorWithVariant ) {
throw new InvalidArgumentException(
"Incompatible 'selector' and 'selectorWithVariant'+'selectorWithoutVariant' given."
);
}
if ( !$prefix && !$selector && !$selectorWithVariant ) {
throw new InvalidArgumentException(
"None of 'prefix', 'selector' or 'selectorWithVariant'+'selectorWithoutVariant' given."
);
}
foreach ( $options as $member => $option ) {
switch ( $member ) {
case 'images':
case 'variants':
if ( !is_array( $option ) ) {
throw new InvalidArgumentException(
"Invalid list error. '$option' given, array expected."
);
}
if ( !isset( $option['default'] ) ) {
// Backwards compatibility
$option = [ 'default' => $option ];
}
foreach ( $option as $skin => $data ) {
if ( !is_array( $option ) ) {
throw new InvalidArgumentException(
"Invalid list error. '$option' given, array expected."
);
}
}
$this->{$member} = $option;
break;
case 'position':
case 'prefix':
case 'selectorWithoutVariant':
case 'selectorWithVariant':
$this->{$member} = (string)$option;
break;
case 'selector':
$this->selectorWithoutVariant = $this->selectorWithVariant = (string)$option;
}
}
}
/**
* Get CSS class prefix used by this module.
* @return string
*/
public function getPrefix() {
$this->loadFromDefinition();
return $this->prefix;
}
/**
* Get CSS selector templates used by this module.
* @return string
*/
public function getSelectors() {
$this->loadFromDefinition();
return [
'selectorWithoutVariant' => $this->selectorWithoutVariant,
'selectorWithVariant' => $this->selectorWithVariant,
];
}
/**
* Get a ResourceLoaderImage object for given image.
* @param string $name Image name
* @param ResourceLoaderContext $context
* @return ResourceLoaderImage|null
*/
public function getImage( $name, ResourceLoaderContext $context ) {
$this->loadFromDefinition();
$images = $this->getImages( $context );
return isset( $images[$name] ) ? $images[$name] : null;
}
/**
* Get ResourceLoaderImage objects for all images.
* @param ResourceLoaderContext $context
* @return ResourceLoaderImage[] Array keyed by image name
*/
public function getImages( ResourceLoaderContext $context ) {
$skin = $context->getSkin();
if ( !isset( $this->imageObjects ) ) {
$this->loadFromDefinition();
$this->imageObjects = [];
}
if ( !isset( $this->imageObjects[$skin] ) ) {
$this->imageObjects[$skin] = [];
if ( !isset( $this->images[$skin] ) ) {
$this->images[$skin] = isset( $this->images['default'] ) ?
$this->images['default'] :
[];
}
foreach ( $this->images[$skin] as $name => $options ) {
$fileDescriptor = is_string( $options ) ? $options : $options['file'];
$allowedVariants = array_merge(
is_array( $options ) && isset( $options['variants'] ) ? $options['variants'] : [],
$this->getGlobalVariants( $context )
);
if ( isset( $this->variants[$skin] ) ) {
$variantConfig = array_intersect_key(
$this->variants[$skin],
array_fill_keys( $allowedVariants, true )
);
} else {
$variantConfig = [];
}
$image = new ResourceLoaderImage(
$name,
$this->getName(),
$fileDescriptor,
$this->localBasePath,
$variantConfig
);
$this->imageObjects[$skin][$image->getName()] = $image;
}
}
return $this->imageObjects[$skin];
}
/**
* Get list of variants in this module that are 'global', i.e., available
* for every image regardless of image options.
* @param ResourceLoaderContext $context
* @return string[]
*/
public function getGlobalVariants( ResourceLoaderContext $context ) {
$skin = $context->getSkin();
if ( !isset( $this->globalVariants ) ) {
$this->loadFromDefinition();
$this->globalVariants = [];
}
if ( !isset( $this->globalVariants[$skin] ) ) {
$this->globalVariants[$skin] = [];
if ( !isset( $this->variants[$skin] ) ) {
$this->variants[$skin] = isset( $this->variants['default'] ) ?
$this->variants['default'] :
[];
}
foreach ( $this->variants[$skin] as $name => $config ) {
if ( isset( $config['global'] ) && $config['global'] ) {
$this->globalVariants[$skin][] = $name;
}
}
}
return $this->globalVariants[$skin];
}
/**
* @param ResourceLoaderContext $context
* @return array
*/
public function getStyles( ResourceLoaderContext $context ) {
$this->loadFromDefinition();
// Build CSS rules
$rules = [];
$script = $context->getResourceLoader()->getLoadScript( $this->getSource() );
$selectors = $this->getSelectors();
foreach ( $this->getImages( $context ) as $name => $image ) {
$declarations = $this->getCssDeclarations(
$image->getDataUri( $context, null, 'original' ),
$image->getUrl( $context, $script, null, 'rasterized' )
);
$declarations = implode( "\n\t", $declarations );
$selector = strtr(
$selectors['selectorWithoutVariant'],
[
'{prefix}' => $this->getPrefix(),
'{name}' => $name,
'{variant}' => '',
]
);
$rules[] = "$selector {\n\t$declarations\n}";
foreach ( $image->getVariants() as $variant ) {
$declarations = $this->getCssDeclarations(
$image->getDataUri( $context, $variant, 'original' ),
$image->getUrl( $context, $script, $variant, 'rasterized' )
);
$declarations = implode( "\n\t", $declarations );
$selector = strtr(
$selectors['selectorWithVariant'],
[
'{prefix}' => $this->getPrefix(),
'{name}' => $name,
'{variant}' => $variant,
]
);
$rules[] = "$selector {\n\t$declarations\n}";
}
}
$style = implode( "\n", $rules );
return [ 'all' => $style ];
}
/**
* SVG support using a transparent gradient to guarantee cross-browser
* compatibility (browsers able to understand gradient syntax support also SVG).
* http://pauginer.tumblr.com/post/36614680636/invisible-gradient-technique
*
* Keep synchronized with the .background-image-svg LESS mixin in
* /resources/src/mediawiki.less/mediawiki.mixins.less.
*
* @param string $primary Primary URI
* @param string $fallback Fallback URI
* @return string[] CSS declarations to use given URIs as background-image
*/
protected function getCssDeclarations( $primary, $fallback ) {
return [
"background-image: url($fallback);",
"background-image: linear-gradient(transparent, transparent), url($primary);",
// Do not serve SVG to Opera 12, bad rendering with border-radius or background-size (T87504)
"background-image: -o-linear-gradient(transparent, transparent), url($fallback);",
];
}
/**
* @return bool
*/
public function supportsURLLoading() {
return false;
}
/**
* Get the definition summary for this module.
*
* @param ResourceLoaderContext $context
* @return array
*/
public function getDefinitionSummary( ResourceLoaderContext $context ) {
$this->loadFromDefinition();
$summary = parent::getDefinitionSummary( $context );
foreach ( [
'localBasePath',
'images',
'variants',
'prefix',
'selectorWithoutVariant',
'selectorWithVariant',
] as $member ) {
$summary[$member] = $this->{$member};
};
return $summary;
}
/**
* Get the last modified timestamp of this module.
*
* @param ResourceLoaderContext $context Context in which to calculate
* the modified time
* @return int UNIX timestamp
*/
public function getModifiedTime( ResourceLoaderContext $context ) {
$this->loadFromDefinition();
$files = [];
foreach ( $this->getImages( $context ) as $name => $image ) {
$files[] = $image->getPath( $context );
}
$files = array_values( array_unique( $files ) );
$filesMtime = max( array_map( [ __CLASS__, 'safeFilemtime' ], $files ) );
return $filesMtime;
}
/**
* Extract a local base path from module definition information.
*
* @param array $options Module definition
* @param string $localBasePath Path to use if not provided in module definition. Defaults
* to $IP
* @return string Local base path
*/
public static function extractLocalBasePath( $options, $localBasePath = null ) {
global $IP;
if ( $localBasePath === null ) {
$localBasePath = $IP;
}
if ( array_key_exists( 'localBasePath', $options ) ) {
$localBasePath = (string)$options['localBasePath'];
}
return $localBasePath;
}
/**
* @return string
*/
public function getPosition() {
$this->loadFromDefinition();
return $this->position;
}
}