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cdiedrich
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Concatenate - how to properly escape double quotes?

Wed Aug 19, 2020 3:06 pm

Good afternoon all,

I'm trying to create a custom probe with passing device_property("FirstAddress") into a ros_command by concatenating the string. I'm struggling to correctly escape double quotes into the concatenated result.

Escaping with a leading \ I get a "parse error" as well as with putting the double quotes into a set of single quotes ('"') with three double quotes in a row (""") It seems to stop right after the first of these sets.
Haven't found anything useful in the manual and forum yet...

Assuming "FirstAddress" is 192.168.250.7 the command I like to achive would be this:
:put [$myfunction 192.168.250.7]
And this is my concatenate approach so far:
ros_command(concatenate('"':put [$myfunction ", device_property("FirstAddress"),"]'"'))
Any help would be highly appreciated.
Thanks!

-Chris
Christopher Diedrich
MTCNA, MTCUME, MTCWE
Basel, Switzerland
Bremen, Germany

There are 10 types of people: Those who understand binary and those who don't.
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excession
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Re: Concatenate - how to properly escape double quotes?

Mon Sep 14, 2020 5:54 pm

Just throwing out this idea / haven't thought about it too hard / almost certainly won't work / wasting my time and yours...
Could you try calling the "FirstAddress" variable in a new dude function then use that dude function in it's place in your concatenate line?
 
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cdiedrich
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Re: Concatenate - how to properly escape double quotes?

Mon Sep 14, 2020 6:06 pm

Now that is brilliant!
Will try this first thing tomorrow morning.
Thanks a lot - the easiest things rarely are that obvious.

-Chris
Christopher Diedrich
MTCNA, MTCUME, MTCWE
Basel, Switzerland
Bremen, Germany

There are 10 types of people: Those who understand binary and those who don't.
There are two types of people: Those who can extrapolate from incomplete data
 
pe1chl
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Re: Concatenate - how to properly escape double quotes?

Mon Sep 14, 2020 6:43 pm

My experience with RouterOS scripting is that you cannot make expressions more and more complex and expect them to behave like most programming languages would.
I.e. you could assign some expression to a variable, you can pass some constant or variable to a function as a parameter, but that does not necessarily mean you can pass a complex expression as a parameter to a function.
It is not clear to me where the limits are. Try to put the concatenate result in a variable first and then pass that variable to the function.

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