func init
	// initialize instance
	if(linked("Result") and sys.is_linked(1))
		sys.add_var(this.name, 'dynamic')
		if(not isdef("Default"))
			blk_init.println(this.codename, ' = ', this.props("Default").value, ';')
		end
	end
end

func make_parse(data)
	s = this.props("MathStr").value
	r = ''
	if(len(s))
		for(n = this.numdatas; n >= 0; n--)
			pname = this.pt_data(n).name
			expr = '\\{' + n + '(:|)(\\w+|)\\}'
			arr = regex_search(s, expr)
			if(arr.size())
				for(i = 0; i < arr.size(); i+=3)
					s = regex_replace(s, expr, sys.to_type(d(pname), sys.type_code(arr.get(i+2))))
				end
			end
		end
		r += code(s)
	end
	return('(' + code(replace(r, "\\r\\n", "")) + ')')
end

func doCalc(data)
	if(linked("Result"))
		blk.println(this.codename, ' = ', make_parse(data), ';')
		event("onResult", this.codename)
	else
		event("onResult", make_parse(data))
	end
end

func doDefault(default)
  blk.println(this.codename, ' = ', d("Default"), ';')
end

func Result
	if(sys.is_linked(1))
		return(this.codename)
	else
		return(make_parse())
	end
end