[fpc-pascal] Free Pascal Language Diagram

[Graeme Geldenhuys]

On 11/09/18 19:49, Anthony Walter wrote:
> 
> https://www.getlazarus.org/learn/language/lexical/

I found a few small bugs in your diagrams.

1) Identifier
[https://www.getlazarus.org/learn/language/lexical/#identifier]

It should look as follows:
┌────────────────────────────────────────────────────────────────────┐
Identifiers

>>─── identifier ──┬─ letter ─┬─┬──────────────┬───────────────────><
                   └─── _ ────┘ ^─┬─ letter ─┬─┘
                                  ├─ digit ──┤
                                  └─── _ ────┘
└─────────────────────────────────────────────────────────────────────┘

Note that identifiers can also start with a <underscore>


2) The Program unit structure
[https://www.getlazarus.org/learn/language/lexical/#program_header]

Strictly speaking (but mostly not used these days), the PROGRAM syntax
can also take a parenthesis with input,output identifiers.

eg:
   program MyUnit (input,output);
   ....

3) Unit Header
[https://www.getlazarus.org/learn/language/lexical/#unit_header]

Again, your syntax is incomplete and should look as follows:

  Unit -> UNIT Ident [HintDirective] ';'



I didn't go through the rest in detail, but these are the ones I spotted
immediately.


Regards,
  Graeme

-- 
fpGUI Toolkit - a cross-platform GUI toolkit using Free Pascal
http://fpgui.sourceforge.net/

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