[Oberon] FPGA - Inline Patterns

[Andreas Pirklbauer]

A string enclosed by $ . . . $, as is used in modules Display or Input for example, is called HexString (see ORS.HexString). HexString is a little feature that elegantly addressed a small problem, but it was never intended to be widely used. That’s why it is not published in the language report - which means that it *is* officially not part of the language. But if you know what you are doing, you can - it likely won’t go away. And if it does, well, then you’d notice ;-)
Andreas

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> Jörg joerg.straube at iaeth.ch Mon Apr 24 18:10:34 CEST 2017
> Officially, the Oberon language only offers expression for constant "array of chars”,
> called string constants.
> The constant "array of bytes" you are refering to is a feature of the compiler,
> not described in the language as far as I know.

> It is also used eg. in the keyboard driver to translate keyboard strokes to chars.

> br
> Jörg

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> Am 24.04.2017 um 17:53 schrieb Tomas Kral <thomas.kral at email.cz <https://lists.inf.ethz.ch/mailman/listinfo/oberon>>:
> 
> Hi,
> 
> I have just discovered this interesting and useful construct, found in
> `Display.Mod', defining a pattern.
> 
> block := SYSTEM.ADR($0808 FFFF C3C3 C3C3 FFFF$);
> 
> pattern = w(byte) h(byte) {raster(byte)}
> 
> block* is exported, so can also be used in user modules.
> 
> Tomas
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