[Oberon] Fwd: IDE with integrated source level debuggerandLuaJIT VM running the Oberon System

Paul Reed paulreed at paddedcell.com
Sun Feb 16 13:37:39 CET 2020

Hi Michael,

> As the directory index in the Oberon filesystem is a B-Tree, the prefix
> is used to optimize the scanning to only look at pages that may contain
> the given prefix.
> Implementations of FileDir.Enumerate are free to ignore the prefix, as
> the only caller in System.Mod will validate the whole filename
> afterwards anyway.

But other clients might not - rather, expecting that Enumerate is 
implemented as in the book, surely?

"The set of visited elements can be restricted by specifying a string 
which is to be a prefix to all enumerated names"

https://inf.ethz.ch/personal/wirth/ProjectOberon/PO.System.pdf, p.100


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