By Niklaus Wirth
Undertaking Oberon includes a definition of the Oberon Language and describes its relation to Modula-2 and the software program instruments constructed with the procedure. This definitive, first-hand account of the layout, improvement, and implementation of Oberon completes the Oberon trilogy.
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Additional resources for Project Oberon: The Design of an Operating System and Compiler (Acm Press Books)
Being a subsystem of a system with a clear modular structure the display system appears in the form of a small hierarchy of modules. Its core is a linearly ordered set consisting of three modules: Display, Viewers, and MenuViewers, the latter building upon the formers. Conceptually, each module contributes an associated class of display-oriented objects and a collection of related service routines. 2 provides an overview of the subsystem viewer management. In this table, modules on upper lines import modules on lower lines and types on upper lines extend types on lower lines.
Actually, we should imagine two parallel planes, one displaying viewers and the other displaying cursors. If there is just one physical plane we take care of painting markers non-destructively, for example in inverse-video mode. Then, no precondition must be established before drawing a marker. However, in the case of a viewer task painting destructively in its viewer's area, the area must be locked first after turning invisible all markers in the area. The technical support of cursor management is again contained in module Oberon.
Because the nature and contents of these frames are typically unknown by their “ancestor” (or “parent”) viewer, a collection of abstract messages is again a promising form of interface. As net effect, the handling of menu viewers boils down to a combination of preprocessing, transforming and forwarding messages to the descendant frames. In summary, the display space in Oberon is hierarchically organized and message passing within the display space obeys the pattern of strict parental control. Frame; menuH, X, Y: INTEGER): Viewer; END MenuViewers.