Method expect

parser/parser.go:126–140

expect returns the next token if it matches the expectation t, and nil otherwise.

(t tokenizer.TokenType)

// expect returns the next token if it matches the expectation t, and
// nil otherwise.
func (p *parser) expect(t tokenizer.TokenType) *tokenizer.Token {
	p.expected = t

	if p.current == nil {
		p.current = p.tokenizer.Next()
	}

	if p.current != nil && p.current.Type == t {
		tok := p.current
		p.current = nil
		return tok
	}

	return nil
}