Changeset 48237 for trunk/src/wp-includes/media.php

Timestamp:

06/30/2020 07:28:07 PM (5 years ago)

Author:

flixos90

Message:

Media: Introduce wp_img_tag_add_width_and_height_attr() to add dimension attributes to images.

Following up on [48170], this changeset moves the new logic to add missing img dimension attributes into a separate function that is run first within wp_filter_content_tags(). It also adds a utility function wp_image_src_get_dimensions() with logic reused from wp_image_add_srcset_and_sizes(), and it ensures that width and height attributes only get added if both of the attributes are missing on the original img tag.

This changeset furthermore improves test coverage and separates tests for the different aspects of img tag modification.

Props azaozz.
Fixes #50367. See #44427.

File:

• trunk/src/wp-includes/media.php (modified) (6 diffs)

trunk/src/wp-includes/media.php

@@ -1493 +1493 @@
 
 /**
+ * Determines an image's width and height dimensions based on the source file.
+ *
+ * @since 5.5.0
+ *
+ * @param string $image_src  The image source file.
+ * @param array  $image_meta The image meta data as returned by 'wp_get_attachment_metadata()'.
+ * @return array|false Array with first element being the width and second element being the height,
+ *                     or false if dimensions cannot be determined.
+ */
+function wp_image_src_get_dimensions( $image_src, $image_meta ) {
+    $image_filename = wp_basename( $image_src );
+
+    if ( wp_basename( $image_meta['file'] ) === $image_filename ) {
+        return array(
+            (int) $image_meta['width'],
+            (int) $image_meta['height'],
+        );
+    }
+
+    foreach ( $image_meta['sizes'] as $image_size_data ) {
+        if ( $image_filename === $image_size_data['file'] ) {
+            return array(
+                (int) $image_size_data['width'],
+                (int) $image_size_data['height'],
+            );
+        }
+    }
+
+    return false;
+}
+
+/**
  * Adds 'srcset' and 'sizes' attributes to an existing 'img' element.
  *
  * @since 4.4.0
- * @since 5.5.0 `width` and `height` are now added if not already present.
  *
  * @see wp_calculate_image_srcset()
@@ -1527 +1558 @@
     }
 
-    $attr = '';
-
     $width  = preg_match( '/ width="([0-9]+)"/', $image, $match_width ) ? (int) $match_width[1] : 0;
     $height = preg_match( '/ height="([0-9]+)"/', $image, $match_height ) ? (int) $match_height[1] : 0;
 
-    if ( ! $width || ! $height ) {
-        /*
-         * If attempts to parse the size value failed, attempt to use the image meta data to match
-         * the image file name from 'src' against the available sizes for an attachment.
-         */
-        $image_filename = wp_basename( $image_src );
-
-        if ( wp_basename( $image_meta['file'] ) === $image_filename ) {
-            $width  = (int) $image_meta['width'];
-            $height = (int) $image_meta['height'];
-        } else {
-            foreach ( $image_meta['sizes'] as $image_size_data ) {
-                if ( $image_filename === $image_size_data['file'] ) {
-                    $width  = (int) $image_size_data['width'];
-                    $height = (int) $image_size_data['height'];
-                    break;
-                }
-            }
-        }
-
-        if ( ! $width || ! $height ) {
+    if ( $width && $height ) {
+        $size_array = array( $width, $height );
+    } else {
+        $size_array = wp_image_src_get_dimensions( $image_src, $image_meta );
+        if ( ! $size_array ) {
             return $image;
         }
-
-        // Add width and height if not present.
-        $attr .= ' ' . trim( image_hwstring( $width, $height ) );
-    }
-
-    $size_array = array( $width, $height );
-    $srcset     = wp_calculate_image_srcset( $size_array, $image_src, $image_meta, $attachment_id );
+    }
+
+    $srcset = wp_calculate_image_srcset( $size_array, $image_src, $image_meta, $attachment_id );
 
     if ( $srcset ) {
@@ -1574 +1583 @@
     if ( $srcset && $sizes ) {
         // Format the 'srcset' and 'sizes' string and escape attributes.
-        $attr .= sprintf( ' srcset="%s"', esc_attr( $srcset ) );
+        $attr = sprintf( ' srcset="%s"', esc_attr( $srcset ) );
 
         if ( is_string( $sizes ) ) {
             $attr .= sprintf( ' sizes="%s"', esc_attr( $sizes ) );
         }
-    }
-
-    if ( empty( $attr ) ) {
-        return $image;
-    }
-
-    // Add extra attributes to the image markup.
-    return preg_replace( '/<img ([^>]+?)[\/ ]*>/', '<img $1' . $attr . ' />', $image );
+
+        // Add extra attributes to the image markup.
+        return preg_replace( '/<img ([^>]+?)[\/ ]*>/', '<img $1' . $attr . ' />', $image );
+    }
+
+    return $image;
 }
 
@@ -1622 +1629 @@
  * @since 5.5.0
  *
+ * @see wp_img_tag_add_width_and_height_attr()
+ * @see wp_img_tag_add_srcset_and_sizes_attr()
  * @see wp_img_tag_add_loading_attr()
- * @see wp_img_tag_add_srcset_and_sizes_attr()
  *
  * @param string $content The HTML content to be filtered.
@@ -1677 +1685 @@
         $filtered_image = $image;
 
+        // Add 'width' and 'height' attributes if applicable.
+        if ( $attachment_id > 0 && false === strpos( $filtered_image, ' width=' ) && false === strpos( $filtered_image, ' height=' ) ) {
+            $filtered_image = wp_img_tag_add_width_and_height_attr( $filtered_image, $context, $attachment_id );
+        }
+
         // Add 'srcset' and 'sizes' attributes if applicable.
         if ( $attachment_id > 0 && false === strpos( $filtered_image, ' srcset=' ) ) {
@@ -1724 +1737 @@
         }
 
-        // Images should have dimension attributes for the `loading` attribute to be added.
-        if ( false === strpos( $image, ' width=' ) || false === strpos( $image, ' height=' ) ) {
+        // Images should have source and dimension attributes for the `loading` attribute to be added.
+        if ( false === strpos( $image, ' src=' ) || false === strpos( $image, ' width=' ) || false === strpos( $image, ' height=' ) ) {
             return $image;
         }
 
-        $quote = null;
-
-        // Check if the img tag is valid (has `src` attribute) and get the quote character.
-        // In almost all cases it will have src and a double quote.
-        if ( false !== strpos( $image, ' src="' ) ) {
-            $quote = '"';
-        } elseif ( preg_match( '/\ssrc\s*=(["\'])/', $image, $matches ) ) {
-            $quote = $matches[1];
-        }
-
-        if ( $quote ) {
-            $loading = "loading={$quote}{$value}{$quote}";
-
-            return str_replace( '<img', "<img {$loading}", $image );
+        return str_replace( '<img', '<img loading="' . esc_attr( $value ) . '"', $image );
+    }
+
+    return $image;
+}
+
+/**
+ * Adds `width` and `height` attributes to an `img` HTML tag.
+ *
+ * @since 5.5.0
+ *
+ * @param string $image         The HTML `img` tag where the attribute should be added.
+ * @param string $context       Additional context to pass to the filters.
+ * @param int    $attachment_id Image attachment ID.
+ * @return string Converted 'img' element with 'width' and 'height' attributes added.
+ */
+function wp_img_tag_add_width_and_height_attr( $image, $context, $attachment_id ) {
+    $image_src         = preg_match( '/src="([^"]+)"/', $image, $match_src ) ? $match_src[1] : '';
+    list( $image_src ) = explode( '?', $image_src );
+
+    // Return early if we couldn't get the image source.
+    if ( ! $image_src ) {
+        return $image;
+    }
+
+    /**
+     * Filters whether to add the missing `width` and `height` HTML attributes to the img tag. Default `true`.
+     *
+     * Returning anything else than `true` will not add the attributes.
+     *
+     * @since 5.5.0
+     *
+     * @param bool   $value         The filtered value, defaults to `true`.
+     * @param string $image         The HTML `img` tag where the attribute should be added.
+     * @param string $context       Additional context about how the function was called or where the img tag is.
+     * @param int    $attachment_id The image attachment ID.
+     */
+    $add = apply_filters( 'wp_img_tag_add_width_and_height_attr', true, $image, $context, $attachment_id );
+
+    if ( true === $add ) {
+        $image_meta = wp_get_attachment_metadata( $attachment_id );
+        $size_array = wp_image_src_get_dimensions( $image_src, $image_meta );
+
+        if ( $size_array ) {
+            $hw = trim( image_hwstring( $size_array[0], $size_array[1] ) );
+            return str_replace( '<img', "<img {$hw}", $image );
         }
     }