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<?php
/**
* Content Inserter class.
*
* @since 2.0.0
*
* @package OMAPI
* @author Justin Sternberg
*/
// Exit if accessed directly.
if ( ! defined( 'ABSPATH' ) ) {
exit;
}
/**
* Content Inserter class.
*
* @since 2.0.0
*/
class OMAPI_Inserter {
/**
* Content to insert.
*
* @since 2.0.0
*
* @var string
*/
protected $to_insert = '';
/**
* Original content.
*
* @since 2.0.0
*
* @var string
*/
protected $content = '';
/**
* Any tags which we should not insert content in.
* The order is important ("a" tag should be after any other tags starting with "a") in order
* to avoid false positives (where "a" tag is "found", but it's really an "abbr" tag).
*
* @since 2.0.0
*
* @var string
*/
const INSERT_AFTER_TAGS = 'address,abbr,acronym,area,audio,a,bdo,big,blockquote,button,b,caption,cite,code,col,colgroup,del,dfn,dl,dt,em,figure,figcaption,font,h1,h2,h3,h4,h5,h6,hgroup,ins,i,kbd,label,legend,map,mark,menu,pre,samp,small,strike,strong,sub,sup,s,table,tbody,textarea,tfoot,thead,title,track,tt,tr,ul,u,ol,var,video';
/**
* Constructor.
*
* @since 2.0.0
*
* @param string $content The original content.
* @param string $to_insert The content to insert into the original content.
*/
public function __construct( $content, $to_insert ) {
$this->content = $content;
$this->to_insert = $to_insert;
}
/**
* Prepend the original content with the content to insert.
*
* @since 2.0.0
*
* @return string The combined content.
*/
public function prepend() {
return $this->to_insert . $this->content;
}
/**
* Append the original content with the content to insert.
*
* @since 2.0.0
*
* @return string The combined content.
*/
public function append() {
return $this->content . $this->to_insert;
}
/**
* Inserts the insert-content after X paragraphs in the original content.
*
* @since 2.0.0
*
* @param int $paragraph_number The paragraph number to insert after.
*
* @return string The combined content.
*/
public function after_paragraph( $paragraph_number ) {
// If "0", then prepend.
if ( empty( $paragraph_number ) ) {
return $this->prepend();
}
$closing_p = '</p>';
$paragraphs = explode( $closing_p, $this->content );
$count = count( $paragraphs );
// If the number of paragraphs in the content is less than
// the number we asked for, just append it to the end.
if ( $count < $paragraph_number ) {
return $this->append();
}
$valid_paragraphs = 0;
$invalid_tag = '';
$appended = false;
foreach ( $paragraphs as $index => $paragraph ) {
// Only add closing tag to non-empty paragraphs.
if ( trim( $paragraph ) ) {
// Adding closing markup now, rather than at implode, means insertion
// is outside of the paragraph markup, and not just inside of it.
$paragraphs[ $index ] .= $closing_p;
}
// If it has already appended, it doesn't need to keep checking.
// It needs to keep the loop to close the paragraph tag.
if ( $appended ) {
continue;
}
// If it has an invalid tag from the last index,
// search if this index has the closing tag.
// If it doesn't have, it need to continue to the next index.
if ( ! empty( $invalid_tag ) && self::find_tag( $invalid_tag, $paragraphs[ $index ] ) ) {
// Found it, let's clean it.
$invalid_tag = '';
}
// Check if it has any after_tags inside this block.
$invalid_tag = self::find_invalid_word_tag( $paragraphs[ $index ] );
if ( ! empty( $invalid_tag ) ) {
// If so, then it must continue counting to the next paragraph.
continue;
}
// This is a valid paragraph.
$valid_paragraphs++;
// If it has enough valid paragraphs, it can continue
if ( $valid_paragraphs === $paragraph_number ) {
// If it doesn't have an invalid tag inside this paragraph,
// it can append after this paragraph.
$paragraphs[ $index ] .= $this->to_insert;
$appended = true;
}
}
// If it appended, it can output all paragraphs.
if ( $appended ) {
return implode( '', $paragraphs );
}
// If it didn't append, then it didn't have enough valid paragraphs,
// so we'll append it to the end.
return $this->append();
}
/**
* Inserts the insert-content after X words in the original content.
*
* @since 2.0.0
*
* @param int $word_number The word number to insert after.
*
* @return string The combined content.
*/
public function after_words( $word_number ) {
// If "0", then prepend.
if ( empty( $word_number ) ) {
return $this->prepend();
}
// The following splitting into words code is copied from the wp_trim_words function.
$rawtext = wp_strip_all_tags( $this->content );
/*
* translators: If your word count is based on single characters (e.g. East Asian characters),
* enter 'characters_excluding_spaces' or 'characters_including_spaces'. Otherwise, enter 'words'.
* Do not translate into your own language.
*/
if ( strpos( _x( 'words', 'Word count type. Do not translate!', 'optin-monster-api' ), 'characters' ) === 0 && preg_match( '/^utf\-?8$/i', get_option( 'blog_charset' ) ) ) {
$rawtext = trim( preg_replace( "/[\n\r\t ]+/", ' ', $rawtext ), ' ' );
preg_match_all( '/./u', $rawtext, $words_array );
$words_array = array_slice( $words_array[0], 0, $word_number + 1 );
} else {
$words_array = preg_split( "/[\n\r\t ]+/", $rawtext, $word_number + 1, PREG_SPLIT_NO_EMPTY );
}
// If the number of words in the content is less than
// the number we asked for, just append it to the end.
if ( count( $words_array ) <= $word_number ) {
return $this->append();
}
// Now we need to clean up the words, removing punctuation,
// so our chances of matching are greater.
foreach ( $words_array as $index => $word ) {
$words_array[ $index ] = preg_replace( '~[^\w\s]~', '', $word );
}
$after_word = $words_array[ $word_number - 1 ];
$number_occurrences = 0;
$rest = array_pop( $words_array );
foreach ( $words_array as $word ) {
if ( ! empty( $after_word ) && false !== strpos( $word, $after_word ) ) {
$number_occurrences++;
}
}
$to_replace = $this->content;
// We need to loop through the number of occurrences...
while ( $number_occurrences-- ) {
// Then find the word in the content to replace...
$pos = strpos( $to_replace, $after_word ) + strlen( $after_word );
// And split that content where the word was found...
$to_replace = substr( $to_replace, $pos );
// And keep doing that until we've reached our final occurrence.
}
// Ok, no we know where we want to insert, but we can't insert inside any
// of our self::INSERT_AFTER_TAGS tags, so we need to insert _after_ them.
$to_replace = self::after_tags( $to_replace );
// Now insert into the content.
$updated_content = str_replace( $to_replace, $this->to_insert . $to_replace, $this->content );
return $updated_content;
}
/**
* Takes given content and returns first acceptable content outside of any
* self::INSERT_AFTER_TAGS tags.
*
* @since 2.0.0
*
* @param string $content Content to replace/find.
*
* @return string Updated content.
*/
protected static function after_tags( $content ) {
foreach ( explode( ',', self::INSERT_AFTER_TAGS ) as $tag ) {
$positions = self::find_tag( $tag, $content );
if ( ! $positions ) {
continue;
}
// Ok... we found a tag that we should scoot behind.
return substr( $content, $positions['closing'] + strlen( $positions['closing_tag'] ) );
}
return $content;
}
/**
* Get the opening/closing positions of given tag.
*
* @since 2.10.0
*
* @param string $tag The html tag.
* @param string $content The html content to search.
*
* @return array Array of tag position data.
*/
public static function get_tag_positions( $tag, $content ) {
if ( self::is_void_element_tag( $tag ) ) {
$result = self::find_void_element_tag( $tag, $content );
return array(
'opening' => $result['position'],
'closing' => $result['position'],
'opening_tag' => $result['tag'],
'closing_tag' => $result['tag'],
);
}
$opening_tag = '<' . $tag . '>';
$opening_pos = stripos( $content, $opening_tag );
if ( false === $opening_pos ) {
$opening_tag = '<' . $tag . ' ';
$opening_pos = stripos( $content, $opening_tag );
}
$closing_tag = '</' . $tag . '>';
$closing_pos = stripos( $content, $closing_tag );
return array(
'opening' => $opening_pos,
'closing' => $closing_pos,
'opening_tag' => $opening_tag,
'closing_tag' => $closing_tag,
);
}
/**
* Find the opening/closing positions of given tag, if found.
*
* @since 2.10.0
*
* @param string $tag The html tag.
* @param string $content The html content to search.
*
* @return array|bool Array of tag position data, if found.
*/
public static function find_tag( $tag, $content ) {
$positions = self::get_tag_positions( $tag, $content );
// Not found, move along.
if ( false === $positions['closing'] ) {
return false;
}
// If we found an opening tag but it comes before the closing,
// then this is not the one we were looking at.
if (
false !== $positions['opening']
&& $positions['opening'] < $positions['closing']
) {
return false;
}
return $positions;
}
/**
* Search for invalid tags within given content.
*
* @since 2.10.0
*
* @param string $content html content to search.
*
* @return string Invalid tag, if found.
*/
public static function find_invalid_word_tag( $content ) {
// Check if it has any after_tags inside this block.
// If so, then it must continue counting to the next paragraph.
foreach ( explode( ',', self::INSERT_AFTER_TAGS ) as $tag ) {
$positions = self::get_tag_positions( $tag, $content );
// Not found, continue to the next
if ( false === $positions['opening'] ) {
continue;
}
// It has it, so it can ignore since it opens and closes inside the paragraph.
// It also needs to check if the closing comes after the opening.
if ( false !== $positions['closing'] && $positions['opening'] < $positions['closing'] ) {
continue;
}
// It doesn't have a closing tag, so this paragraph lives inside an invalid tag.
return $tag;
}
return '';
}
/**
* Find the given void element tag position/occurrence.
*
* @since 2.10.0
*
* @param string $tag The void element tag name.
* @param string $content html content to search.
*
* @return array Array of found element occurrence and string position.
*/
public static function find_void_element_tag( $tag, $content ) {
preg_match_all( '~<' . $tag . '.*?\/?>~i', $content, $matches );
if ( ! empty( $matches[0][0] ) ) {
return array(
'tag' => $matches[0][0],
'position' => strpos( $content, $matches[0][0] ),
);
}
return array(
'tag' => '<' . $tag . '/>',
'position' => false,
);
}
/**
* Check if given tag is a void element tag.
*
* @since 2.10.0
*
* @param string $tag HTML tag name.
*
* @return boolean
*/
public static function is_void_element_tag( $tag ) {
return in_array(
strtolower( $tag ),
array(
'area',
'base',
'br',
'col',
'embed',
'hr',
'img',
'input',
'link',
'meta',
'param',
'source',
'track',
'wbr',
'command',
'keygen',
'menuitem',
),
true
);
}
}