Your suggestion seemed promising, but I can’t make it work :
1) `map.metaClass` is null
2) `map.getClass().metaClass.is <http://metaclass.is/> = null` or
`Map.metaClass.is <http://map.metaclass.is/> = null` does not remove the `is`
method
3) `map[is]` gives `Caught: groovy.lang.MissingPropertyException: No such
property: is for class: …`
I am curious, you said « but it works », what version of groovy (groovy
--version) did you use ?
> Le 2015-10-28 à 01:08, Edinson E. Padrón Urdaneta
> <edinson.padron.urdan...@gmail.com> a écrit :
>
> If you want to use `is` in your DSL you could try:
>
> def check(condition) {
> // Define and initialize a new map
> def map = [:]
>
> // Remove the `is` method from the map's metaclass
> map.metaClass.is <http://map.metaclass.is/> = null
>
> // Add the key-value pair we care for the DSL
> map[is] = { bool ->
> println "checking if $condition yields $bool, with 'is'"
> }
>
> // Return the map
> map
> }
>
> I don't know if the above follows good practices or at very least is a good
> idea (remember that I'm very new) but it works.
>
>
> On Wed, Oct 28, 2015 at 12:19 AM, Edinson E. Padrón Urdaneta
> <edinson.padron.urdan...@gmail.com
> <mailto:edinson.padron.urdan...@gmail.com>> wrote:
> Well, I'm very new to groovy so I could be very wrong but `is` is a method of
> `GroovyObjectSupport`, so maybe you are invoking that method in your DSL
> without knowing that.
>
> On Tue, Oct 27, 2015 at 10:47 PM, Marc Paquette <mar...@mac.com
> <mailto:mar...@mac.com>> wrote:
> Playing with DSL here (going through chapter 19 of « Groovy In Action, second
> edition », well worth the read). It seems that one cannot use the word ‘is’
> to build a command chain dsl, but ‘IS’ or ‘Is’ or ‘iS’ are ok… Or is it
> something I’m doing wrong ?
>
> ```
> [marcpa@MarcPaquette dsl]$ groovy --version
> Groovy Version: 2.4.3 JVM: 1.8.0_60 Vendor: Oracle Corporation OS: Mac OS X
> [marcpa@MarcPaquette dsl]$ cat chainWithLowerCaseIsFails.groovy
> def check(condition) {
> [is: { bool ->
> println "checking if $condition yields $bool, with 'is'"
> },
> IS: { bool ->
> println "checking if $condition yields $bool, with 'IS'"
> }]
> }
>
> cond = (1<2)
> check cond is true
> check cond IS true
> [marcpa@MarcPaquette dsl]$ groovy chainWithLowerCaseIsFails.groovy
> checking if true yields true, with 'IS'
> [marcpa@MarcPaquette dsl]$
> ```
>
> Marc Paquette
>
>
>
