FbesDiff.php

<?php

require_once 'finediff.php';

$isInFbes = false;

class FbesDiff extends FineDiff {
	public static function renderToTextFromOpcodes( $from, $opcodes ) {
		ob_start();
		FbesDiff::renderFromOpcodes( $from, $opcodes, [ 'FbesDiff', 'renderToTextFromOpcode' ] );

		return ob_get_clean();
	}

	/** @noinspection PhpUnusedPrivateMethodInspection */
	public static function renderToTextFromOpcode( $opcode, $from, $from_offset, $from_len ) {
		global $isInFbes;
		// Filter out fbes_keep and fbes_remove tags:
		// fbes_remove should remain in
		// fbes_keep and its contents should remain in
		$original = substr( $from, $from_offset, $from_len );
		if ( $opcode === 'd' ) {
			$fragments = preg_split( '@(?=\[\/?fbes_(remove|keep)])@i', $original );
			foreach ( $fragments as $fragment ) {
				if ( strcasecmp( '[fbes_keep]', $fragment ) == 0 ) {
					$isInFbes = true;
					echo $fragment;
				} else if ( strcasecmp( '[/fbes_keep]', $fragment ) === 0 ) {
					$isInFbes = false;
					echo $fragment;
				} else if ( preg_match( '@^\[\/?fbes_remove]$@i', $fragment ) ) {
					echo $fragment;
				} else if ( $isInFbes ) {
					echo $fragment;
				} else {
					echo '';
				}
			}
		}

		// Vanilla functionality (that we can't reuse, since parent is private, NGH)
		if ( $opcode === 'c' || $opcode === 'i' ) {
			echo $original;
		}
	}
}

FbesDiffTest.php

<?php

/**
 * Created by PhpStorm.
 * User: marks
 * Date: 02/11/2016
 * Time: 20:11
 */
require_once 'FbesDiff.php';
class FbesDiffTest extends PHPUnit_Framework_TestCase {

	public function testNormal() {
		$input = 'Potato. Potatyo. Potato.';
		$opcodes = 'c7d9c8i9: Potayto.';
		$target = 'Potato. Potato. Potayto.';
		$rendered = FbesDiff::renderToTextFromOpcodes($input, $opcodes);
		$this->assertEquals($target, $rendered);
	}

	public function testApply() {
		$input = <<<ENDSTR
NEW DJS,NEW MUSIC!!![fbes_remove] (time schedule coming soon)[/fbes_remove][fbes_keep]

Times: blabla[/fbes_keep]

Ticket price: 12€ includes 2 shot tokens
ENDSTR;

		$opcodes = 'c20d13c28d25c4d29c42i:.';
		$target = <<<ENDSTR
NEW DJS,NEW MUSIC!!![fbes_remove] (time schedule coming soon)[/fbes_remove][fbes_keep]

Times: blabla[/fbes_keep]

Ticket price: 12€ includes 2 shot tokens.
ENDSTR;

//		FbesDiff::renderFromOpcodes( $input, $opcodes, [ 'FbesDiff', 'renderToTextFromOpcode' ] );
		$rendered = FbesDiff::renderToTextFromOpcodes($input, $opcodes);
		$this->assertEquals($target, $rendered);
	}

	public function testOther() {
		$input = <<<ENDSTR
➡️If you have any question please do not hesitate to contact us ([fbes_remove]https://www.facebook.com/messages/REDACTED[/fbes_remove][fbes_keep]hello@REDACTED.example[/fbes_keep])
ENDSTR;
		$opcodes = 'c68d14c44d60ci6: TEST';
		$target = <<<ENDSTR
➡️If you have any question please do not hesitate to contact us ([fbes_remove]https://www.facebook.com/messages/REDACTED[/fbes_remove][fbes_keep]hello@REDACTED.example[/fbes_keep]) TEST
ENDSTR;
		$rendered = FbesDiff::renderToTextFromOpcodes($input, $opcodes);
		$this->assertEquals($target, $rendered);
	}

}