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<?php |
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namespace Wingsline\Blog\Markdown; |
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use Intervention\Image\ImageManager; |
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use Michelf\MarkdownExtra; |
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class Markdown extends MarkdownExtra |
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{ |
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/** |
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* High Pixel density descriptor. |
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*/ |
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const HIGH_PIXEL_DENSITY = '2x'; |
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/** |
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* Above this size we consider the image high ppi. |
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*/ |
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const MAX_POINT_PER_INCH = 96; |
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/** |
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* Add srcset for the locally stored image. |
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* |
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* @param string $url |
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*/ |
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public function addSrcSet($url): string |
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{ |
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$result = ' srcset="'.$url; |
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// for local images we expand to the full path |
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if (is_file(public_path($url))) { |
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$image_url = public_path($url); |
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} else { |
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$image_url = url($url); |
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} |
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$result .= $this->getImagePixelDensity($image_url); |
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$result .= '"'; |
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return $result; |
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} |
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/** |
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* Converts markdown to html. |
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*/ |
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public function convertToHtml(string $markdown): string |
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{ |
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return static::defaultTransform($markdown); |
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} |
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/** |
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* Static method to convert markdown to html. |
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* |
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* @return string |
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*/ |
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public static function convertWithParser(string $markdown) |
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{ |
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$method = config('blog.markdown_parser.method'); |
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return app(config('blog.markdown_parser.class')) |
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->{$method}($markdown); |
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} |
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/** |
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* Returns 2x if the image is high pixel density. |
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* |
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* @param string $image_url |
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* |
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* @return string |
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*/ |
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public function getImagePixelDensity($image_url) |
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{ |
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// Currently we support only imagick |
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if (! \extension_loaded('imagick')) { |
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return ''; |
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} |
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try { |
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$manager = new ImageManager(['driver' => 'imagick']); |
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$img = $manager->make($image_url)->getCore(); |
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} catch (\Exception $e) { |
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return ''; |
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} |
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$unit = $img->getImageUnits(); |
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$resolution = array_sum($img->getImageResolution()); |
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// Based on the units we determine if the image is high dpi. If no |
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// resolution is set, we default to high dpi, since imagick cannot |
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// reliably detect for example phone screenshot resolutions. |
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$pixel_density = ' '; |
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switch ($unit) { |
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case \imagick::RESOLUTION_PIXELSPERINCH: |
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$max_resolution = (static::MAX_POINT_PER_INCH * 2); |
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$pixel_density .= $resolution > $max_resolution ? static::HIGH_PIXEL_DENSITY : ''; |
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break; |
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case \imagick::RESOLUTION_PIXELSPERCENTIMETER: |
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$max_resolution = (static::MAX_POINT_PER_INCH * 2) / 2.54; |
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$pixel_density .= $resolution > $max_resolution ? static::HIGH_PIXEL_DENSITY : ''; |
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break; |
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default: |
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$pixel_density .= static::HIGH_PIXEL_DENSITY; |
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break; |
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} |
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return rtrim($pixel_density); |
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} |
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/** |
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* Callback for inline images. |
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* |
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* @param array $matches |
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* |
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* @return string |
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*/ |
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protected function _doImages_inline_callback($matches) |
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{ |
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$whole_match = $matches[1]; |
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$alt_text = $matches[2]; |
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$url = '' == $matches[3] ? $matches[4] : $matches[3]; |
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$title = &$matches[7]; |
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$attr = $this->doExtraAttributes('img', $dummy = &$matches[8]); |
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$alt_text = $this->encodeAttribute($alt_text); |
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$url = $this->encodeURLAttribute($url); |
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$result = "<img src=\"${url}\" alt=\"${alt_text}\""; |
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if (isset($title)) { |
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$title = $this->encodeAttribute($title); |
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$result .= " title=\"${title}\""; // $title already quoted |
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} |
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$result .= $attr; |
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// srcset |
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$result .= $this->addSrcSet($url); |
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$result .= $this->empty_element_suffix; |
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return $this->hashPart($result); |
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} |
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/** |
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* Callback for referenced images. |
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* |
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* @param array $matches |
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* |
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* @return string |
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*/ |
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protected function _doImages_reference_callback($matches) |
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{ |
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$whole_match = $matches[1]; |
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$alt_text = $matches[2]; |
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$link_id = strtolower($matches[3]); |
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if ('' == $link_id) { |
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$link_id = strtolower($alt_text); // for shortcut links like ![this][]. |
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} |
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$alt_text = $this->encodeAttribute($alt_text); |
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if (isset($this->urls[$link_id])) { |
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$url = $this->encodeURLAttribute($this->urls[$link_id]); |
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$result = "<img src=\"${url}\" alt=\"${alt_text}\""; |
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if (isset($this->titles[$link_id])) { |
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$title = $this->titles[$link_id]; |
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$title = $this->encodeAttribute($title); |
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$result .= " title=\"${title}\""; |
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} |
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if (isset($this->ref_attr[$link_id])) { |
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$result .= $this->ref_attr[$link_id]; |
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} |
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// srcset |
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$result .= $this->addSrcSet($url); |
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$result .= $this->empty_element_suffix; |
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$result = $this->hashPart($result); |
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} else { |
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// If there's no such link ID, leave intact: |
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$result = $whole_match; |
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} |
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return $result; |
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} |
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} |
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wingsline /
laravel-blog
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