UnifiedDiffFormatter.php

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<?php
class UnifiedDiffFormatter extends DiffFormatter {
 
    protected $leadingContextLines = 2;
 
    protected $trailingContextLines = 2;
 
    protected function lines( $lines, $prefix = ' ' ) {
        foreach ( $lines as $line ) {
            $this->writeOutput( "{$prefix}{$line}\n" );
        }
    }
 
    protected function added( $lines ) {
        $this->lines( $lines, '+' );
    }
 
    protected function deleted( $lines ) {
        $this->lines( $lines, '-' );
    }
 
    protected function changed( $orig, $closing ) {
        $this->deleted( $orig );
        $this->added( $closing );
    }
 
    protected function blockHeader( $xbeg, $xlen, $ybeg, $ylen ) {
        return "@@ -$xbeg,$xlen +$ybeg,$ylen @@";
    }
 
}