/**
* Renders a diff.
*
* @param diff &$diff A diff object.
*
* @return string The formatted output.
*/
function render(&$diff)
{
$xi = $yi = 1;
$block = false;
$context = array();
// Create a new diff object if it is a 3-way diff
if (is_a($diff, 'diff3')) {
$diff3 =& $diff;
$diff_1 = $diff3->get_original();
$diff_2 = $diff3->merged_output();
unset($diff3);
$diff = new diff($diff_1, $diff_2);
}
$nlead = $this->_leading_context_lines;
$ntrail = $this->_trailing_context_lines;
$output = $this->_start_diff();
$diffs = $diff->get_diff();
foreach ($diffs as $i => $edit) {
// If these are unchanged (copied) lines, and we want to keep leading or trailing context lines, extract them from the copy block.
if (is_a($edit, 'diff_op_copy')) {
// Do we have any diff blocks yet?
if (is_array($block)) {
// How many lines to keep as context from the copy block.
$keep = $i == sizeof($diffs) - 1 ? $ntrail : $nlead + $ntrail;
if (sizeof($edit->orig) <= $keep) {
// We have less lines in the block than we want for context => keep the whole block.
$block[] = $edit;
} else {
if ($ntrail) {
// Create a new block with as many lines as we need for the trailing context.
$context = array_slice($edit->orig, 0, $ntrail);
$block[] = new diff_op_copy($context);
}
$output .= $this->_block($x0, $ntrail + $xi - $x0, $y0, $ntrail + $yi - $y0, $block);
$block = false;
}
}
// Keep the copy block as the context for the next block.
$context = $edit->orig;
} else {
// Don't we have any diff blocks yet?
if (!is_array($block)) {
// Extract context lines from the preceding copy block.
$context = array_slice($context, sizeof($context) - $nlead);
$x0 = $xi - sizeof($context);
$y0 = $yi - sizeof($context);
$block = array();
if ($context) {
$block[] = new diff_op_copy($context);
}
}
$block[] = $edit;
}
$xi += $edit->orig ? sizeof($edit->orig) : 0;
$yi += $edit->final ? sizeof($edit->final) : 0;
}
if (is_array($block)) {
$output .= $this->_block($x0, $xi - $x0, $y0, $yi - $y0, $block);
}
return $output . $this->_end_diff();
}
