Execute() Math expressions and evaluate strings

[MrKris1224]

Hi, i have a small problem with Execute()... I don't know how to use it completly.

For example i want evaluate two strings with Execute("string=string"). Why Execute() returns 0?

Next: Execute("3>=0") returns 1 but Execute("3=>0") returns 0. Why? How to correct it?

Next: Execute("1!=0") returns 0 but expression is true...

And... Can I use And / Or / Not operators in Execute()? If yes then how?
Why i can't evaluate strings? How to do this?

Plz, help me and sorry for english if somethink is bad.

[kylomas]

MrKris1224,

Works for me...

local $aComp = [1,2,3,4,5,5,6,7,8,8,9]
for $i = 1 to ubound($aComp) - 1
    ConsoleWrite(execute("$aComp[$i] = $aComp[$i-1]") & @CRLF)
next

Post runnable code for more help.

kylomas

[BrewManNH]

Maybe you shouldn't be using Execute for whatever it is you're trying to do?

Execute("3>=0") will return True because the comparison evaluates that 3 greater than or equal to 0. (Boolean True = 1)

Execute("3=>0") is just written wrong, so it returns an error of 1, and a return value of "" (empty string).

Execute("1!=0") is also written wrong because AutoIt doesn't use != as an operator and returns an error of 1 and a return value of "".

Not knowing what you're strings contain, it's impossible to say why it returns zero. Although, Execute("string=string") WILL return True if that were your actual comparison strings.

 

[Malkey]

@BrewManNH

Note:' Execute("string=string")' is not just string comparison. The string has to be a function name to return True. This is the case on my system.

 

The following 10 ConsoleWrites all return True.

ConsoleWrite(Execute("string = string") & @LF)
ConsoleWrite(Execute("3 >= 0") & @LF)
ConsoleWrite(Execute("0 <= 3") & @LF)
ConsoleWrite(Execute("1 <> 0") & @LF)

ConsoleWrite("(string = string):         " & (string = string) & @LF)
ConsoleWrite("(Default = Default):       " & (Default = Default) & @LF)
ConsoleWrite("(FileExists = FileExists): " & (FileExists = FileExists) & @LF)

ConsoleWrite((3 >= 0) & @LF)
ConsoleWrite((0 <= 3) & @LF)
ConsoleWrite((1 <> 0) & @LF)

 

[BrewManNH]

@BrewManNH

Note:' Execute("string=string")' is not just string comparison. The string has to be a function name to return True. This is the case on my system.

 

The following 10 ConsoleWrites all return True.

 

Aren't you contradicting yourself with the first Execute in your code? If Execute("string = string") returns true, where's the function name?

[iamtheky]

isnt 'string' the function name? (whereas random other strings do not return true)

ConsoleWrite(Execute("string = string") & @LF)
ConsoleWrite(Execute("SomeOtherString = SomeOtherString") & @LF)

 

Edited October 9, 2015 by boththose

[BrewManNH]

Ahhh, you're right, I hadn't thought about the word being a keyword. DOH

[MrKris1224]

Ok, thanks but can I use AND / NOT / OR operators in expressions?

[BrewManNH]

Don't use Execute at all if you don't need it, and none of your examples shown need to use Execute unless there's something in your script that you haven't posted. Execute has only limited times that it is necessary, and these don't fit.

[MrKris1224]

Yes but I need it to my "programming language" writen in autoit

[kylomas]

MrKris1224,

Can you give an example (in code) of where you need "execute"?

kylomas

[MrKris1224]

I use it in parsing "if" command in my "programming language" for example:

if "expression"
*commands*
endif

And parser looks like:
If Execute($expression) Then
...
Endif

 

Maybe there's another way to make it?

 

@Update

In parser $expression is variable. So if $expression = "string = string" then Execute() return 0 but if $expression = ' "string" = "string" ' then return 1

Edited October 10, 2015 by MrKris1224

[BrewManNH]

Post a runnable script in which you're using Execute to do something, we can probably suggest a better way to do it.

[MrKris1224]

I posted...

If Execute($expression) Then
...
Endif

 

[BrewManNH]

Can you run that snippet?

I can't, I don't have the surrounding code you're using, I don't know what $expression holds, or where you got it from.

Runnable code = a script that can be run without having to write anything around it to get it to work.

Reproducer script = Runnable code that demonstrates what you're doing in your script, even if it's not the same script as you're using as long as the code posted does exactly the same thing as your real script.

Once you post the reproducer script that demonstrates what you're doing in exactly the same way as you're doing it in your script, then we have something to work with.

BTW, click the link in my signature, the big blue one that says "How to ask questions the smart way!" if what I am posting doesn't make sense. It's been translated into over a dozen languages if you're not strong with English. That link explains what I'm asking for in a much better way than I can explain.

[MrKris1224]

Topic to close. I see you don't know how to help me.

[BrewManNH]

Oh I'm sure I know how to help you, I'm just not sure if you're able to post a script that demonstrates what you're trying to do.

In my humble opinion, whatever you're using Execute for, can probably be done without it, you should try it and see.

 

[Malkey]

The following 9 ConsoleWrites all return True.

Local $a = True
Local $b = True
Local $c = False

ConsoleWrite(($a And $b And (Not $c)) & @LF)
ConsoleWrite(Execute("$a And $b And (Not $c)") & @LF)

ConsoleWrite(($a Or $c) & @LF)
ConsoleWrite(Execute("$a Or $c") & @LF)

ConsoleWrite((BitAND(23, 12) = 4) & @LF)
ConsoleWrite(Execute("BitAnd(23, 12) = 4") & @LF)

; Note quotation marks around the strings.
ConsoleWrite(("abcd" = "abcd") & @LF)
ConsoleWrite(Execute('"abcd" = "Abcd"') & @LF)  ; Case insensitive
ConsoleWrite(Execute('"abcd" == "abcd"') & @LF) ; Case sensitive

 

[czardas]

I posted...

If Execute($expression) Then
...
Endif

 

This construct looks fine to me. There may be alternatives - but I'm not aware of them.

You need to clearly define the syntax of your language and also make sure you only pass expressions which the interpreter can actually execute. This will likely require some preprocessing of the expression depending on syntax. You need to know how to interpret the results of the executed expression: because AutoIt is a loosely typed language and can sometimes throw up some unexpected results. Ask yourself - What are the advantages (and disadvantages) of creating an alternative syntax (or language)? Start with some very simple expressions and test them against expected results. Be aware that Execute() is only intended for simple (single line) expressions passed as strings. Internal conversions can play havoc if you don't pay attention to certain limitations (not so easy to define).

[MrKris1224]

OK . Syntax of my language is:

if expression

commands

endif

And autoit script get line with if and split it for two variables. First = name of function (if), second = expression to execute. Now parser looks like:
 

If Execute($expression) Then
    Return 0 ;it's for execute commands under if command

Else

    Return _find_endif() ; it's for jump to endif linie if expression is false
endif

@Malkey

Thanks for it code:

ConsoleWrite(Execute('"abcd" = "Abcd"') & @LF)  ; Case insensitive
ConsoleWrite(Execute('"abcd" == "abcd"') & @LF) ; Case sensitive

Now i know the expression must be in quotes if including strings.

 

@czardas

i writed lots of own languages but every time i have problem with parsing if command. Now my language isn't only if... It is more funcionaly

Edited October 11, 2015 by MrKris1224