Expression Parser Broken - Length Function

Question

The code below does not work:
 1: ClearVariables() 2: $buffer = "foo;bar;quux" 3: $sepPos = 3 4: $len0 = Length($buffer)-$sepPos-1

error: Quote: Error on line 4: Operator '-' invalid for strings.  1st attempt with a different code:
 1: ClearVariables() 2: $buffer = "foo;bar;quux" 3: $sepPos = 3 4: $len1 = Length($buffer) - $sepPos 5: $len1 = $len1 - $sepPos

same error. 2nd attempt (success)
 1: ClearVariables() 2: $buffer = "foo;bar;quux" 3: $sepPos = 3 4: $len2 = Length($buffer) 5: $len2 = $len2 - $sepPos - 1

it seems the the parser assumes Length function returns a string ?

DJ Sures · Accepted Answer

fixed in next release

mikebmac · Answer

Quote:1st attempt with a different code: Code:
 1: ClearVariables() 2: $buffer = "foo;bar;quux" 3: $sepPos = 3 4: $len1 = Length($buffer) - $sepPos 5: $len1 = $len1 - $sepPos

I ran into this issue myself, if you don't want to separate it over multiple lines you can cast the length in an int. I guess it is just one of the limitations of not declaring variable types. Code:
ClearVariables() $buffer = "foo;bar;quux" $sepPos = 3 $len0 = CInt(Length($buffer)) - $sepPos-1 Print( $len0 )

ptp · Answer

yes is another away to skin the cat... i had other similar issues with other functions too. I don't agree with "it's just one of the limitations of not declaring variable types" mainly because of this:
 $rLen1 = IndexOf($buffer, ";")-$len1-1

and it works, one function and two math operations. Length() is returning the correct type (integer), only when combined behaves differently i'm guessing is really a parser issue.

mikebmac · Answer

Length() is returning the correct type (integer), only when combined behaves differently i'm guessing is really a parser issue.

Makes sense.

ptp · Answer

Thanks

elfege · Answer

It seems I'm facing the same issue. I just installed the latest version of EZB...
 $encoderBVAR = $encoderB - $var if ($encoderA < $encoderBVAR) $forwardmustwait = 1 $pwmFR = $pwmFR +$mod $pwmRR = $pwmRR +$mod $pwmFL = $pwmFL -$mod $pwmRL = $pwmRL -$mod $forwardmustwait = 0 endif

> Error on line 45: Operator '-' invalid for strings. Done (00:00:00.5009241)

CochranRobotics · Answer

Just a guess here but try
 $encoderBVAR = $encoderB - $var if ($encoderA < $encoderBVAR) $forwardmustwait = 1 $pwmFR = $pwmFR + $mod $pwmRR = $pwmRR + $mod $pwmFL = $pwmFL - $mod $pwmRL = $pwmRL - $mod $forwardmustwait = 0 endif

DJ Sures · Answer

Elfge, Dave is right. You will need spaces between the operation commands.

elfege · Answer

lol I just spent 4 minutes looking and I can't figure where my spaces are missing. It's time I take a break I guess... thank you DJ and Dave...

DJ Sures · Answer

Haha I hear u! That regex parser is a little wonky sometimes for the script compiler. I spend so much time in there with little tweaks - the way it is now is the most optimal for performance.

elfege · Answer

Eventually found where the spaces were missing. But in fact the problem was not at these lines, but at the definition of the variable. Anyway, it fixed itself it seems, just after ARC crashed, I restarted it and could use the minus function, without adding spaces. I did add them after though, just in case. Thanks a lot Dj! Again, really, I appreciate the incredible dedication and, in my particular case, the incredible patience! Sorry again for this day when I went nuts on the DHCP issue... I still think about it...

DJ Sures · Answer

We all learn and progress me, doubly so! My dicioline is patience to hear what others have to say and understand what to do about it. With everyone having very specific needs, I'm challenged to invent solutions to accommodate the group. I want you to build robots, so you're conversations are incredible relevant. Never feel bad

ptp

Expression Parser Broken - Length Function

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