Changeset 23773

Timestamp:

03/22/2013 05:25:20 AM (12 years ago)

Author:

markjaquith

Message:

Add functions to extract a URL from an arbitrary string, HTML, or the current $post

props wonderboymusic. see #23570

File:

• trunk/wp-includes/post-formats.php (modified) (2 diffs)

trunk/wp-includes/post-formats.php

@@ -312 +312 @@
         case 'link':
             $compat['tag'] = '';
+            $compat['position'] = 'before';
 
             if ( ! empty( $meta['url'] ) ) {
                 $esc_url = preg_quote( $meta['url'], '#' );
                 // Make sure the same URL isn't in the post (modified/extended versions allowed)
-                if ( ! preg_match( '#' . $esc_url . '[^/&\?]#', $content ) ) {
-                    $format_output .= sprintf(
-                        '<a %shref="%s">%s</a>',
-                        empty( $compat['link_class'] ) ? '' : sprintf( 'class="%s" ', esc_attr( $compat['link_class'] ) ),
-                        esc_url( $meta['url'] ),
-                        empty( $post->post_title ) ? esc_url( $meta['url'] ) : apply_filters( 'the_title', $post->post_title, $post->ID )
-                    );
+                if ( ! preg_match( '#' . $esc_url . '[^/&\?]?#', $content ) ) {
+                    $url = $meta['url'];
+                } else {
+                    $url = get_content_url( $content, true );
                 }
+            } else {
+                $content_before = $content;
+                $url = get_content_url( $content, true );
+                if ( $content_before == $content )
+                    $url = '';
             }
+
+            if ( ! empty( $url ) ) {
+                $format_output .= sprintf(
+                    '<a %shref="%s">%s</a>',
+                    empty( $compat['link_class'] ) ? '' : sprintf( 'class="%s" ', esc_attr( $compat['link_class'] ) ),
+                    esc_url( $url ),
+                    empty( $post->post_title ) ? esc_url( $meta['url'] ) : apply_filters( 'the_title', $post->post_title )
+                );
+            }
             break;
 
@@ -379 +391 @@
     return $output;
 }
+
+/**
+ * Extract a URL from passed content, if possible
+ * Checks for a URL on the first line of the content or the first encountered href attribute.
+ *
+ * @since 3.6.0
+ *
+ * @param string $content A string which might contain a URL.
+ * @param boolean $remove Whether the remove the found URL from the passed content.
+ * @return string The found URL.
+ */
+function get_content_url( &$content, $remove = false ) {
+    if ( empty( $content ) )
+        return '';
+
+    $matches = array();
+
+    // the content is a URL
+    $trimmed = trim( $content );
+    if ( 0 === stripos( $trimmed, 'http' ) && ! preg_match( '#\s#', $trimmed ) ) {
+        if ( $remove )
+            $content = '';
+
+        return $trimmed;
+    // the content is HTML so we grab the first href
+    } elseif ( preg_match( '/<a\s[^>]*?href=[\'"](.+?)[\'"]/is', $content, $matches ) ) {
+        return esc_url_raw( $matches[1] );
+    }
+
+    $lines = explode( "\n", $trimmed );
+    $line = trim( array_shift( $lines ) );
+
+    // the content is a URL followed by content
+    if ( 0 === stripos( $line, 'http' ) ) {
+        if ( $remove )
+            $content = trim( join( "\n", $lines ) );
+
+        return esc_url_raw( $line );
+    }
+
+    return '';
+}
+
+/**
+ * Attempt to retrieve a URL from a post's content
+ *
+ * @since 3.6.0
+ *
+ * @param int $id Optional. Post ID.
+ * @return string A URL, if found.
+ */
+function get_the_url( $id = 0 ) {
+    $post = empty( $id ) ? get_post() : get_post( $id );
+    if ( empty( $post ) )
+        return '';
+
+    if ( has_post_format( 'link', $post ) ) {
+        $meta = get_post_format_meta( $post->ID );
+        if ( ! empty( $meta['url'] ) )
+            return esc_url_raw( $meta['url'] );
+    }
+
+    if ( ! empty( $post->post_content ) )
+        return get_content_url( $post->post_content );
+}
+
+/**
+ * Attempt to output a URL from a post's content
+ *
+ * @since 3.6.0
+ *.
+ */
+function the_url() {
+    echo esc_url( get_the_url() );
+}