private function getPrecedingToken($text, $position)
{
$start = $position;
while ($start > 0 && !StringUtil::isWhitespace($text[$start - 1])) {
$start--;
}
$precedingToken = substr($text, $start, $position - $start);
return $precedingToken;
}
private function getToken($text, $position)
{
if ($position < strlen($text) - 1 && !StringUtil::isWhitespace(substr($text, $position + 1, 1))) {
$nextWs = StringUtil::getNextWhitespace($text, $position);
$prevWs = StringUtil::getPrevWhitespace($text, $position);
$tokenStart = $prevWs === false ? 0 : $prevWs + 1;
$tokenEnd = $nextWs === false ? strlen($text) : $nextWs;
$token = substr($text, $tokenStart, $tokenEnd - $tokenStart);
// strip trailing .
if (!empty($token) && in_array($token[strlen($token) - 1], $this->eosChars)) {
$token = substr($token, 0, strlen($token) - 1);
}
return $token;
} else {
return '';
}
}
public function testIsWhitespace()
{
$this->assertEquals(true, StringUtil::isWhitespace(' '));
$this->assertEquals(true, StringUtil::isWhitespace("\t"));
$this->assertEquals(true, StringUtil::isWhitespace("\n"));
}
