|Interpreter in PL/1 email@example.com (sven) (1996-12-03)|
|Re: Interpreter in PL/1 firstname.lastname@example.org (1996-12-15)|
|Date:||3 Dec 1996 20:52:01 -0500|
|Organization:||INnet NV (post doesn't reflect views of INnet NV)|
I am writing an interpreter in PL/1??? I can see you heads now looking
at the terminal: "PL/1???????".
Yep. PL/1. It's a challenge :) I am inventing the wheel.
I am writing an expression evaluator to process some number crunching
without having to recompile the whole program back again.
ex: Put 1+1 into the interpreter, and 2 comes out...
I am planning to put some flow control statements in it too.
I am not using any tools like LEX and YACC to make my grammar work. I am
writing the whole thing in pure PL/1 using recursive descent techniques.
In fact, I am writing PL/1 in PL/1.
Does anybody have some more examples of source coding in C, (PL/1??),
pascal or other non object oriented language of an implementation of an
interpreter with type checing and flow control?
I am fed up with searching through the web looking for an interpreter
that doesn't use parsing and lexing tables to do the job?
I am interpreting the source code at run time. I am very aware that this
is not the best thing to do, but I think that it is good enough for now.
Later I wil extend the interpreter by constructing a parsing tree for
processing the flow inside, before I execute any statement in the input.
Sorry for my bad English...
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