function: eval

Tolnaftate2004 · #1 03-24-2008, 05:33 AM

eval()

eval(str) - evaluates/executes a string of GScript.

You asked for it and you got it. eval is a function available in other scripting languages. Its only parameter is a string of code to be executed. This is not so much to show off the script, but rather I hope I can get some input into what this function should do. Useful? Sure. You could save expressions such as "player.hp += this.hpgain;" in mudlib files, or similar. The possibilities are probably endless, but I'm just the guy doing the coding.

Currently supports:

strings, arrays, variables, functions, comments, operators
error catching, garbage collection
variable assignment toggling, protection

To be added:

flow structures
temp.- variables of calling function accessible

To be limited in final release:

for, while, do-while loops
'new' operator
script complexity

If there's something you want to fix/write, go ahead and post your update in this thread. Questions, comments, critique, and requests are welcomed. Please try it and report issues!

I have included an "unstable" version of the parser. It may have some debug messages, etc. This file will be updated more regularly.

Updates:

April 16
- fixed small bug with constructs like a(2) [the 2 turned into 0].
- added support for dynamic variable names this.(@blah).
- added support for the [] operator.
April 19
- added support for special concatenation operators (SPC, TAB, NL), oops!
- tested @ array; it works
April 26
- fixed a bug with inserting operators with constructs like h = f(g(x)).
- the script is accurately finding functions (there may be some issues). It is not yet calling the functions, though.
April 28, 29, 30
- Made the dot operator a LOT faster, yay!
- added support for functions, woo!
- added comma operator (that should be all of them!)

cbk1994 · #2 03-24-2008, 05:41 AM

That's truly amazing, far beyond what I could do.

Inverness · #3 03-24-2008, 05:58 AM

You know once you declare a variable as temp you don't need the temp. for the rest of that function right?

All the temp. is melting my eyes

But damn fine job on that eval().

Tolnaftate2004 · #4 03-24-2008, 09:12 AM

Quote:

Originally Posted by Inverness

You know once you declare a variable as temp you don't need the temp. for the rest of that function right?

I know, this is my preference, though.

Tigairius · #5 03-24-2008, 09:41 AM

Quote:

Originally Posted by Tolnaftate2004

I know, this is my preference, though.

Mine too, and you always amaze me with your scripts

Dan · #6 03-24-2008, 10:44 AM

Nice

Tolnaftate2004 · #7 03-24-2008, 11:37 AM

Question: should eval be able to access temp. variables declared within the scope that eval is called? e.g.,

PHP Code:


			
temp.a_variable = 74;
eval("this.ihaveadream=temp.a_variable+1");

Otherwise, it would be written to allow the access to only those temp. variables declared within the executed string.

PHP Code:


			
eval("temp.a=37.694; this.oridont = temp.a/6;");

e: I have updated the first post with a new version (actually, several times tonight, so far...)
e2: in and ',' operators are conflicting by precedence (',' < in). Inspire me to solve the problem that is 'in |a,b|'! It's tough to say that ',' could have enough foresight to see it's part of in.