path: root/srcs/wordpress/wp-includes/class-wp-text-diff-renderer-table.php

<?php
/**
 * Diff API: WP_Text_Diff_Renderer_Table class
 *
 * @package WordPress
 * @subpackage Diff
 * @since 4.7.0
 */

/**
 * Table renderer to display the diff lines.
 *
 * @since 2.6.0
 * @uses Text_Diff_Renderer Extends
 */
class WP_Text_Diff_Renderer_Table extends Text_Diff_Renderer {

	/**
	 * @see Text_Diff_Renderer::_leading_context_lines
	 * @var int
	 * @since 2.6.0
	 */
	public $_leading_context_lines = 10000;

	/**
	 * @see Text_Diff_Renderer::_trailing_context_lines
	 * @var int
	 * @since 2.6.0
	 */
	public $_trailing_context_lines = 10000;

	/**
	 * Threshold for when a diff should be saved or omitted.
	 *
	 * @var float
	 * @since 2.6.0
	 */
	protected $_diff_threshold = 0.6;

	/**
	 * Inline display helper object name.
	 *
	 * @var string
	 * @since 2.6.0
	 */
	protected $inline_diff_renderer = 'WP_Text_Diff_Renderer_inline';

	/**
	 * Should we show the split view or not
	 *
	 * @var string
	 * @since 3.6.0
	 */
	protected $_show_split_view = true;

	protected $compat_fields = array( '_show_split_view', 'inline_diff_renderer', '_diff_threshold' );

	/**
	 * Caches the output of count_chars() in compute_string_distance()
	 *
	 * @var array
	 * @since 5.0.0
	 */
	protected $count_cache = array();

	/**
	 * Caches the difference calculation in compute_string_distance()
	 *
	 * @var array
	 * @since 5.0.0
	 */
	protected $difference_cache = array();

	/**
	 * Constructor - Call parent constructor with params array.
	 *
	 * This will set class properties based on the key value pairs in the array.
	 *
	 * @since 2.6.0
	 *
	 * @param array $params
	 */
	public function __construct( $params = array() ) {
		parent::__construct( $params );
		if ( isset( $params['show_split_view'] ) ) {
			$this->_show_split_view = $params['show_split_view'];
		}
	}

	/**
	 * @ignore
	 *
	 * @param string $header
	 * @return string
	 */
	public function _startBlock( $header ) {
		return '';
	}

	/**
	 * @ignore
	 *
	 * @param array $lines
	 * @param string $prefix
	 */
	public function _lines( $lines, $prefix = ' ' ) {
	}

	/**
	 * @ignore
	 *
	 * @param string $line HTML-escape the value.
	 * @return string
	 */
	public function addedLine( $line ) {
		return "<td class='diff-addedline'><span aria-hidden='true' class='dashicons dashicons-plus'></span><span class='screen-reader-text'>" . __( 'Added:' ) . " </span>{$line}</td>";

	}

	/**
	 * @ignore
	 *
	 * @param string $line HTML-escape the value.
	 * @return string
	 */
	public function deletedLine( $line ) {
		return "<td class='diff-deletedline'><span aria-hidden='true' class='dashicons dashicons-minus'></span><span class='screen-reader-text'>" . __( 'Deleted:' ) . " </span>{$line}</td>";
	}

	/**
	 * @ignore
	 *
	 * @param string $line HTML-escape the value.
	 * @return string
	 */
	public function contextLine( $line ) {
		return "<td class='diff-context'><span class='screen-reader-text'>" . __( 'Unchanged:' ) . " </span>{$line}</td>";
	}

	/**
	 * @ignore
	 *
	 * @return string
	 */
	public function emptyLine() {
		return '<td>&nbsp;</td>';
	}

	/**
	 * @ignore
	 *
	 * @param array $lines
	 * @param bool $encode
	 * @return string
	 */
	public function _added( $lines, $encode = true ) {
		$r = '';
		foreach ( $lines as $line ) {
			if ( $encode ) {
				$processed_line = htmlspecialchars( $line );

				/**
				 * Contextually filters a diffed line.
				 *
				 * Filters TextDiff processing of diffed line. By default, diffs are processed with
				 * htmlspecialchars. Use this filter to remove or change the processing. Passes a context
				 * indicating if the line is added, deleted or unchanged.
				 *
				 * @since 4.1.0
				 *
				 * @param String $processed_line The processed diffed line.
				 * @param String $line           The unprocessed diffed line.
				 * @param string null            The line context. Values are 'added', 'deleted' or 'unchanged'.
				 */
				$line = apply_filters( 'process_text_diff_html', $processed_line, $line, 'added' );
			}

			if ( $this->_show_split_view ) {
				$r .= '<tr>' . $this->emptyLine() . $this->emptyLine() . $this->addedLine( $line ) . "</tr>\n";
			} else {
				$r .= '<tr>' . $this->addedLine( $line ) . "</tr>\n";
			}
		}
		return $r;
	}

	/**
	 * @ignore
	 *
	 * @param array $lines
	 * @param bool $encode
	 * @return string
	 */
	public function _deleted( $lines, $encode = true ) {
		$r = '';
		foreach ( $lines as $line ) {
			if ( $encode ) {
				$processed_line = htmlspecialchars( $line );

				/** This filter is documented in wp-includes/wp-diff.php */
				$line = apply_filters( 'process_text_diff_html', $processed_line, $line, 'deleted' );
			}
			if ( $this->_show_split_view ) {
				$r .= '<tr>' . $this->deletedLine( $line ) . $this->emptyLine() . $this->emptyLine() . "</tr>\n";
			} else {
				$r .= '<tr>' . $this->deletedLine( $line ) . "</tr>\n";
			}
		}
		return $r;
	}

	/**
	 * @ignore
	 *
	 * @param array $lines
	 * @param bool $encode
	 * @return string
	 */
	public function _context( $lines, $encode = true ) {
		$r = '';
		foreach ( $lines as $line ) {
			if ( $encode ) {
				$processed_line = htmlspecialchars( $line );

				/** This filter is documented in wp-includes/wp-diff.php */
				$line = apply_filters( 'process_text_diff_html', $processed_line, $line, 'unchanged' );
			}
			if ( $this->_show_split_view ) {
				$r .= '<tr>' . $this->contextLine( $line ) . $this->emptyLine() . $this->contextLine( $line ) . "</tr>\n";
			} else {
				$r .= '<tr>' . $this->contextLine( $line ) . "</tr>\n";
			}
		}
		return $r;
	}

	/**
	 * Process changed lines to do word-by-word diffs for extra highlighting.
	 *
	 * (TRAC style) sometimes these lines can actually be deleted or added rows.
	 * We do additional processing to figure that out
	 *
	 * @since 2.6.0
	 *
	 * @param array $orig
	 * @param array $final
	 * @return string
	 */
	public function _changed( $orig, $final ) {
		$r = '';

		// Does the aforementioned additional processing
		// *_matches tell what rows are "the same" in orig and final. Those pairs will be diffed to get word changes
		//	match is numeric: an index in other column
		//	match is 'X': no match. It is a new row
		// *_rows are column vectors for the orig column and the final column.
		//	row >= 0: an indix of the $orig or $final array
		//	row  < 0: a blank row for that column
		list($orig_matches, $final_matches, $orig_rows, $final_rows) = $this->interleave_changed_lines( $orig, $final );

		// These will hold the word changes as determined by an inline diff
		$orig_diffs  = array();
		$final_diffs = array();

		// Compute word diffs for each matched pair using the inline diff
		foreach ( $orig_matches as $o => $f ) {
			if ( is_numeric( $o ) && is_numeric( $f ) ) {
				$text_diff = new Text_Diff( 'auto', array( array( $orig[ $o ] ), array( $final[ $f ] ) ) );
				$renderer  = new $this->inline_diff_renderer;
				$diff      = $renderer->render( $text_diff );

				// If they're too different, don't include any <ins> or <dels>
				if ( preg_match_all( '!(<ins>.*?</ins>|<del>.*?</del>)!', $diff, $diff_matches ) ) {
					// length of all text between <ins> or <del>
					$stripped_matches = strlen( strip_tags( join( ' ', $diff_matches[0] ) ) );
					// since we count lengith of text between <ins> or <del> (instead of picking just one),
					//	we double the length of chars not in those tags.
					$stripped_diff = strlen( strip_tags( $diff ) ) * 2 - $stripped_matches;
					$diff_ratio    = $stripped_matches / $stripped_diff;
					if ( $diff_ratio > $this->_diff_threshold ) {
						continue; // Too different. Don't save diffs.
					}
				}

				// Un-inline the diffs by removing del or ins
				$orig_diffs[ $o ]  = preg_replace( '|<ins>.*?</ins>|', '', $diff );
				$final_diffs[ $f ] = preg_replace( '|<del>.*?</del>|', '', $diff );
			}
		}

		foreach ( array_keys( $orig_rows ) as $row ) {
			// Both columns have blanks. Ignore them.
			if ( $orig_rows[ $row ] < 0 && $final_rows[ $row ] < 0 ) {
				continue;
			}

			// If we have a word based diff, use it. Otherwise, use the normal line.
			if ( isset( $orig_diffs[ $orig_rows[ $row ] ] ) ) {
				$orig_line = $orig_diffs[ $orig_rows[ $row ] ];
			} elseif ( isset( $orig[ $orig_rows[ $row ] ] ) ) {
				$orig_line = htmlspecialchars( $orig[ $orig_rows[ $row ] ] );
			} else {
				$orig_line = '';
			}

			if ( isset( $final_diffs[ $final_rows[ $row ] ] ) ) {
				$final_line = $final_diffs[ $final_rows[ $row ] ];
			} elseif ( isset( $final[ $final_rows[ $row ] ] ) ) {
				$final_line = htmlspecialchars( $final[ $final_rows[ $row ] ] );
			} else {
				$final_line = '';
			}

			if ( $orig_rows[ $row ] < 0 ) { // Orig is blank. This is really an added row.
				$r .= $this->_added( array( $final_line ), false );
			}