String Parsing
 

Say I had an editable text box and when the person entered a number in it I needed the number for something like:

if(player.gralats = "Params[1] * 15") {

Would their be anyother way to do it then string parsing , or would anyone like to explain to me in detail about string parsing?

-Thanks in advance
Toxen

Not sure what you're asking.
If you only want it to display the first 15 characters then you can do: params[1].substring(0, 15)

if you want to cut off the first 15 characters you can do: params[1].substring(15)

If you want to cut off all the characters before "15" you can do:
params[1].substring(params[1].pos(15))

Also you should use == for comparison. Using one = is for declaration.
if (player.rupees == params[1].substring(15)) { for example.

If you just need to parse a string you could do:
params = obj.text.tokenize();

then use params[0] for the first space. You can define which character to parse like this:
params = obj.text.tokenize("a");
if obj.text = "123abc123abc";
params[0] would = 123
params[1] would = bc123
and so on.

Well Tig, I'm wondering how to take in the text and then use it right after in the same event, like I have an edit able text area and they put a number in there to see how many packages of that item, they'd like so it's not like a set text yet, so how would I do it?

obj.text

function Obj.onAction() {
player.chat = "I typed in" SPC obj.text;
}

I believe he's trying to do something like so:

Would be interesting to figure this out. Graal needs an eval() function.

Chompy released a parser like this, and I released one a while back.

Kinda difficult when dealing when []'s and such but still possible.

substring(0, 15)

hehe...I learned this in VB today. ^^

~Aeko...slowly understanding scripts letter by letter~

I don't see why we need to parse a string if we're doing simple math...
text*15 or float(text)*15 should suffice, but if there's something I'm missing here, might I recommend this script (though I hate to plug my own script >_<). It has the necessary code to do this, probably
Not totally sure on this though.

Though, I'm willing to help make a limited eval() if there is enough demand for it.

From what he told me, he's trying to make a text box and allow people to input simple mathematics and variables, and then translate them to return a readable value. The script I posted was merely an example of what he essentially wants done.

But if that was possible, making a calculator in a programming language would be easy as pie..

I've started a parser that is suppose to parse math stuff like 1+1, a+1=2 etc. but I got bored with it and couldn't decide if I wanted to include variables or not and a lot of other stuff..

Toxen, you could do something like this (although there are a few ways):

NPC Code:

---

if (obj.text.pos("*") > 0) {

  temp.token = obj.text.tokenize("*");

  player.chat = temp.token[0] @ "x" @ temp.token[1] @ "=" @ temp.token[0] * temp.token[1];

}

---

and certainly better ways if you're planning on making a calculator or so.

It's funny because my programming assignment for this week is to make a calculator that converts an in-fixed expression to a post-fixed expression and then calculates the post-fixed expression and returns the result.

Probably that method would be the best for an eval() also. I guess I could make one when I do my assignment on Friday (due date, duh). Oh it also involves stacks.

Email Google, ask for theirs, then convert it to GS2 :D

They wouldn't give you it ;)

Google's is simple.

You can't convert that to gScript unless we have an eval() function *nods to Stefan*

What an ignorant thing to say.
http://www.google.com/help/calculator.html

Anyhow, it sounds to me like Toxen is just asking how to use a string number in calculations, if that is the case then Graal converts it automatically.

newnumber = TextEditObject.text * 5;

PHP has perl regular expressions. This is still easily accomplished.

I actually used
[PHP]

temp.arr = params[0].tokenize();
for (temp.i=0; temp.i<temp.arr.size(); temp.i++) {
temp.arr[temp.i] = int(temp.arr[temp.i]);
}

and it worked so.

Attached is a script for eval() for doing math. It can handle almost any gscript operator right now ('new' and ?: I have omitted, and 'in' because this does not yet support arrays for all I know). It recognizes this. variables in a very elementary way. Strings, GUI objects/TStaticVar/etc, and functions are not supported at this time, as well as op= operators, ++ pre and post increment operators, -- pre and post decrement operators, and the like.

I would perhaps make this a class and join it to a static variable.

Dangerous to use eval for assignment or modification of variables though.

Doesn't take much to disable it.

Awesome.

I've updated the script above:

• added protected variables, you can keep eval from modifying some variables by adding to this.
• added the option to disable the use of assignment operator (won't break evaluation, though).
• for those who would like to use it, the operator is fixed
• added limited support for @ (strictly for concatenation)
• restored precedence (for the most part), fixing the != operator

I wonder if I should finish it? Would eval be beneficial to anyone? Does anyone need it to do something particular?

Thank you all so much, and especially to you pfa, that is a pretty nice script.

Good work.
This guy I like :D

Yes, please finish it! :)

Allright. I will make a new thread for this.