Method formalParameterList

src/main/java/org/dynjs/parser/js/Parser.java:1074–1097

()

    }

    public List<Parameter> formalParameterList() {
        List<Parameter> params = new ArrayList<>();

        while (la() != RIGHT_PAREN) {
            params.add(parameter());
            if (la() == COMMA) {
                consume();
            } else {
                break;
            }
        }

        if (currentContext().isStrict()) {
            Set<String> seen = new HashSet<>();
            for (Parameter each : params) {
                if (seen.contains(each.getIdentifier())) {
                    throw new SyntaxError(each.getPosition(), "duplicate formal parameters not allowed in strict-mode");
                }
                seen.add(each.getIdentifier());
            }
        }

        return params;
    }

    public Parameter parameter() {
        Token identifier = consume(IDENTIFIER);