/**
* Reads sourcecode from files, for the backtrace.
*
* @param string $file
* Path to the file you want to read.
* @param int $highlight
* The line number you want to highlight
* @param int $from
* The start line.
* @param int $to
* The end line.
*
* @return string
* The source code.
*/
public function readSourcecode($file, $highlight, $from, $to)
{
$result = '';
if (is_readable($file)) {
// Load content and add it to the backtrace.
$contentArray = file($file);
// Correct the value, in case we are exceeding the line numbers.
if ($from < 0) {
$from = 0;
}
if ($to > count($contentArray)) {
$to = count($contentArray);
}
for ($currentLineNo = $from; $currentLineNo <= $to; $currentLineNo++) {
if (isset($contentArray[$currentLineNo])) {
// Add it to the result.
$realLineNo = $currentLineNo + 1;
// Escape it.
$contentArray[$currentLineNo] = $this->encodeString($contentArray[$currentLineNo], true);
if ($currentLineNo === $highlight) {
$result .= $this->render->renderBacktraceSourceLine('highlight', $realLineNo, $contentArray[$currentLineNo]);
} else {
$result .= $this->render->renderBacktraceSourceLine('source', $realLineNo, $contentArray[$currentLineNo]);
}
} else {
// End of the file.
break;
}
}
}
return $result;
}