Why is there no or or and ?
F i L
witte2008 at gmail.com
Fri Feb 17 12:52:55 PST 2012
H. S. Teoh wrote:
> Are you referring to:
> int x = 10;
> x = 10;
> In that case I would still prefer :=, since the first can be
> thought of
> as shorthand for "int x; x := 10".
I'm not sure what you're asking/saying here. What I mean is that
there needs to be some distinction between variable declarations
and variable assignment.
// lots of code
x := 0 // set Foo.x or create a local 'x' variable?
>> I don't think lines need ending marks at all.
> This leads to ambiguity problems if it's unclear whether two
> lines are a single statement or two. It also makes the grammar
> harder to implement in a parser, because it can't easily tell
> the end of a statement and a wrapped line. Having a statement
> is a good thing.
I don't think this leads to ambiguity problems, I've thought
about this before and can't come up with any that aren't easily
addressed. Also, I don't think is much harder to parse at all,
just when the statement is determined to stop needs to be
slightly more intelligent. If we can understand the code without
ending-marks, a compiler should be able to understand it as well.
This is something I'm experimenting with at the moment with LLVM.
> Wait, you're trying to reimplement D syntax??
Nothing so robust. Mostly I'm playing around with compiler design
while refreshing my C++ abilities (which it's been awhile). My
main focus is to try and build a simplistic compiler around the
concept of having an AST designed to stay in memory and be
dynamically submitted changes and on-demand compilation (like
NRefactory, or MS Roslyn). Kinda like and interrupter only
designed with the goal of 1) Non-text forms of manipulation and
logic construction, and 2) modularized AST libraries as
development reflection tools (think objects overview,
I'm thinking of textual syntax as more of "commands" to submit
AST nodes, so there's no real "syntax" beyond what's saved in a
file, which isn't really suppose to be humanly read/written
though a traditional text editor. I think "standard tools" (+
modularized to used by other tools) are as important as standard
Just a hobby :)
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