getSourceUrl(), $other->getSourceUrl())) { throw new \InvalidArgumentException("Source URLs \"{$this->getSourceUrl()}\" and \"{$other->getSourceUrl()}\" don't match."); } return abs($this->getOffset() - $other->getOffset()); } public function pointSpan(): SourceSpan { return new SimpleSourceSpan($this, $this, ''); } public function compareTo(SourceLocation $other): int { if (!Util::isSameUrl($this->getSourceUrl(), $other->getSourceUrl())) { throw new \InvalidArgumentException("Source URLs \"{$this->getSourceUrl()}\" and \"{$other->getSourceUrl()}\" don't match."); } return $this->getOffset() - $other->getOffset(); } }