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

props wonderboymusic. see #23570

git-svn-id: https://develop.svn.wordpress.org/trunk@23773 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Mark Jaquith 2013-03-22 05:25:20 +00:00
parent bb00d973a7
commit a5cb6404d4
1 changed files with 94 additions and 7 deletions
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101
wp-includes/post-formats.php
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@ -311,19 +311,31 @@ function post_formats_compat( $content, $id = 0 ) {
switch ( $format ) {
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;
case 'quote':
@ -378,3 +390,78 @@ function post_formats_compat( $content, $id = 0 ) {
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() );
}