Method parseSimpleSelectorSequence

parser.go:708–762

parseSimpleSelectorSequence parses a selector sequence that applies to a single element.

()

// parseSimpleSelectorSequence parses a selector sequence that applies to
// a single element.
func (p *parser) parseSimpleSelectorSequence() (Selector, error) {
	var result Selector

	if p.i >= len(p.s) {
		return nil, errors.New("expected selector, found EOF instead")
	}

	switch p.s[p.i] {
	case '*':
		// It's the universal selector. Just skip over it, since it doesn't affect the meaning.
		p.i++
	case '#', '.', '[', ':':
		// There's no type selector. Wait to process the other till the main loop.
	default:
		r, err := p.parseTypeSelector()
		if err != nil {
			return nil, err
		}
		result = r
	}

loop:
	for p.i < len(p.s) {
		var ns Selector
		var err error
		switch p.s[p.i] {
		case '#':
			ns, err = p.parseIDSelector()
		case '.':
			ns, err = p.parseClassSelector()
		case '[':
			ns, err = p.parseAttributeSelector()
		case ':':
			ns, err = p.parsePseudoclassSelector()
		default:
			break loop
		}
		if err != nil {
			return nil, err
		}
		if result == nil {
			result = ns
		} else {
			result = intersectionSelector(result, ns)
		}
	}

	if result == nil {
		result = func(n *html.Node) bool {
			return n.Type == html.ElementNode
		}
	}

	return result, nil
}

// parseSelector parses a selector that may include combinators.
func (p *parser) parseSelector() (result Selector, err error) {