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<?php


/**
 * youtube shortcode
 *
 * Contains shortcode + some improvements over the Embeds syntax @
 * http://codex.wordpress.org/Embeds
 *
 * @example [youtube=http://www.youtube.com/watch?v=wq0rXGLs0YM&fs=1&hl=bg_BG]
 */

// 2008-07-15:
// <object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/bZBHZT3a-FA&hl=en&fs=1"></param><param name="allowFullScreen" value="true"></param><embed src="http://www.youtube.com/v/bZBHZT3a-FA&hl=en&fs=1" type="application/x-shockwave-flash" allowfullscreen="true" width="425" height="344"></embed></object>
// around 2008-06-06 youtube changed their old embed code to this:
// <object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/M1D30gS7Z8U&hl=en"></param><embed src="http://www.youtube.com/v/M1D30gS7Z8U&hl=en" type="application/x-shockwave-flash" width="425" height="344"></embed></object>
// old style was:
// <object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/dGY28Qbj76A&rel=0"></param><param name="wmode" value="transparent"></param><embed src="http://www.youtube.com/v/dGY28Qbj76A&rel=0" type="application/x-shockwave-flash" wmode="transparent" width="425" height="344"></embed></object>
// 12-2010:
// <object width="640" height="385"><param name="movie" value="http://www.youtube.com/v/3H8bnKdf654?fs=1&amp;hl=en_GB"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/3H8bnKdf654?fs=1&amp;hl=en_GB" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="640" height="385"></embed></object>
// 01-2011:
// <iframe title="YouTube video player" class="youtube-player" type="text/html" width="640" height="390" src="http://www.youtube.com/embed/Qq9El3ki0_g" frameborder="0" allowFullScreen></iframe>
// <iframe class="youtube-player" type="text/html" width="640" height="385" src="http://www.youtube.com/embed/VIDEO_ID" frameborder="0"></iframe>
/* function youtube_embed_to_short_code() – Replaces YouTube embeds with YouTube shortcodes. */

add_filter( 'pre_kses', 'youtube_embed_to_short_code' );

/* function youtube_link() – Replaces plain-text links to YouTube videos with YouTube embeds. */

/* function youtube_link_callback() – Callback function for the regex that replaces YouTube URLs with
YouTube embeds. */

if ( ! function_exists( 'youtube_sanitize_url' ) ) :
/* function youtube_sanitize_url() – Normalizes a YouTube URL to include a v= parameter and a query string free of encoded ampersands. */
endif;

/*
 * url can be:
 *    http://www.youtube.com/embed/videoseries?list=PL94269DA08231042B&amp;hl=en_US
 *    http://www.youtube.com/watch#!v=H2Ncxw1xfck
 *    http://www.youtube.com/watch?v=H2Ncxw1xfck
 *    http://www.youtube.com/watch?v=H2Ncxw1xfck&w=320&h=240&fmt=1&rel=0&showsearch=1&hd=0
 *    http://www.youtube.com/v/jF-kELmmvgA
 *    http://www.youtube.com/v/9FhMMmqzbD8?fs=1&hl=en_US
 *    http://youtu.be/Rrohlqeir5E
 */

/* function youtube_id() – Converts a YouTube URL into an embedded YouTube video. */

/* function youtube_shortcode() – Filter the YouTube video HTML output. */

add_shortcode( 'youtube', 'youtube_shortcode' );

/* function wpcom_youtube_embed_crazy_url() – For bare URLs on their own line of the form
http://www.youtube.com/v/9FhMMmqzbD8?fs=1&hl=en_US */

/* function wpcom_youtube_embed_crazy_url_init() – */

add_action( 'init', 'wpcom_youtube_embed_crazy_url_init' );


/**
 * Allow oEmbeds in Jetpack's Comment form.
 *
 * @module shortcodes
 *
 * @since 2.8.0
 *
 * @param int get_option('embed_autourls') Option to automatically embed all plain text URLs.
 */
if ( ! is_admin() && apply_filters( 'jetpack_comments_allow_oembed', true ) ) {
  // We attach wp_kses_post to comment_text in default-filters.php with priority of 10 anyway, so the iframe gets filtered out.
  // Higher priority because we need it before auto-link and autop get to it
  add_filter( 'comment_text', 'youtube_link', 1 );
}

/* function jetpack_fix_youtube_shortcode_display_filter() – Core changes to do_shortcode (https://core.trac.wordpress.org/changeset/34747) broke "improper" shortcodes
with the format [shortcode=http://url.com]. */
add_filter( 'the_content', 'jetpack_fix_youtube_shortcode_display_filter', 7 );
 

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