Method parseCall

query/expr/parser.go:522–553

parseCall parses a function call. This function assumes the function name and LPAREN have been consumed.

(name string)

// parseCall parses a function call.
// This function assumes the function name and LPAREN have been consumed.
func (p *Parser) parseCall(name string) (*Call, error) {
	name = strings.ToLower(name)
	// If there's a right paren then just return immediately.
	if tok, _, _ := p.scan(); tok == RPAREN {
		return &Call{Name: name}, nil
	}
	p.unscan()

	// Otherwise parse function call arguments.
	var args []Expr
	for {
		// Parse an expression argument.
		arg, err := p.ParseExpr(0)
		if err != nil {
			return nil, err
		}
		args = append(args, arg)

		// If there's not a comma next then stop parsing arguments.
		if tok, _, _ := p.scan(); tok != COMMA {
			p.unscan()
			break
		}
	}

	// There should be a right parentheses at the end.
	if tok, pos, lit := p.scan(); tok != RPAREN {
		return nil, newParseError(tokstr(tok, lit), []string{")"}, pos)
	}

	return &Call{Name: name, Args: args}, nil
}

// scan returns the next token from the underlying scanner.
func (p *Parser) scan() (tok Token, pos Pos, lit string) { return p.s.Scan() }