[rules-users] DSL Bug?

[Stephen Masters]

Unless you provide some means of separating the two values, it's not feasible for the parser to recognise them. That's why adding a space works for you. Think about the DSRL that could be written:

	There is a fact 12345678

>From that, what is the "fact_name" and what is the "fact_label"?

But add a space to your DSL and given:

	There is a fact 123 45678

… it's clear that the fact_name is 123 and the fact_label is 45678.

Steve


On 11 Feb 2013, at 15:57, rjr201 <rich.j.riley at gmail.com> wrote:

> I've had the following problem when creating a DSL. Not sure if it's a bug,
> but it confused me for a good 40 minutes so thought I'd mention it here in
> case others have the same problem.. 
> 
> If I create a DSL like this: 
> 
> [when]There is a fact {fact_name}{fact_label}={fact_label}:{fact_name}()
> 
> And create a rule in the guided editor that has Object as the {fact_name}
> and $obj as the {fact_label} I get: 
> 
> 1.	|	rule "rule"
> 2.	|	    dialect "mvel"
> 3.	|	    when
> 4.	|	        Object$obj:()
> 5.	|	    then
> 6.	|	end
> 
> as the source.
> 
> At first I thought it was to do with putting quotation marks around the
> {}'s. But I've since found that if I put a space between {fact_name} and
> {fact_label} I get the expected result of: 
> 
> 1.	|	rule "rule"
> 2.	|	    dialect "mvel"
> 3.	|	    when
> 4.	|	        $obj:Object()
> 5.	|	    then
> 6.	|	end
> 
> Again, sorry if this is down to my limited understanding of DSLs. Any
> further insights into why this happens or any other quirks of DSLs would be
> greatly appreciated as I'm going to be spending a lot of time with them in
> the not too distant future.. 
> 
> Rich. 
> 
> 
> 
> --
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