unified.php

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<?php
class Text_Diff_Renderer_unified extends Text_Diff_Renderer
{

    public $_leading_context_lines = 4;

    public $_trailing_context_lines = 4;

    public function _blockHeader($xbeg, $xlen, $ybeg, $ylen)
    {
        if ($xlen != 1) {
            $xbeg .= ',' . $xlen;
        }
        if ($ylen != 1) {
            $ybeg .= ',' . $ylen;
        }
        return "@@ -$xbeg +$ybeg @@";
    }

    public function _added($lines)
    {
        return $this->_lines($lines, '+');
    }

    public function _deleted($lines)
    {
        return $this->_lines($lines, '-');
    }

    public function _changed($orig, $final)
    {
        return $this->_deleted($orig) . $this->_added($final);
    }
}