Methods and interface for building command expressions in a comp

Details Methods and interface for building command expressions in a comp Methods and interface for building command expressions in a comp

1995-11-13

1998-08-25

Voeltz, Emanuel Todd

Computer graphics processing and selective visual display system

Display driving control circuitry

Controlling the condition of display elements

G06F 1700

Patent

active

057987572

ABSTRACT:
The system of the present invention comprises a development system having an Expression Builder for assisting a user with creating an expression. With full syntax checking enabled, the user builds an expression in "token" mode. As the user enters each token element, the system attempts to validate the expression and, if the expression is valid, displays the result. If the expression is incomplete or invalid, however, the system displays a message explaining what is needed. The Expression Builder of the present invention employs placeholders or "proxies" for representing elements in an expression which should be replaced before the expression is valid. The expression is dynamically adjusted during user editing as required to maintain expression validity. In this manner, the user is provided with in situ assistance in constructing syntactically-correct expressions.

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