Abstract: The new method and system uses an arbitrary language specification organized as a series of words and characters or a hierarchical list of elements converted to a collection of inline controls to generate and modify any code or symbols using one or more windows. The controls are added to one or more windows depending on the user's choice of how to view/use the changeable controls; inline or in another window that functions as a structured, indented outline so the user can manage controls outside the default editing window. A composite class pattern for expression types and extended controls extends interactivity, and makes a scalable API possible. Word, required value, binary option, ternary option, series option, repeatable and nested, or recursively repeating, expressions are included in the class structure, making any command or syntax possible.