If those strings come from the outside, then using eval on them is a no-no.
Consider what happens if your input string is "${System.exit(1)}" or
"${Shell.run('rm -rf /')}". Only use eval on sanitized input and only if
there is no simpler way.
On 20 April 2016 at 09:32, Guillaume Laforge <glafo...@gmail.com> wrote:
> Eval.x(v) should just work as well.
>
> Regarding resources / performance, it means spinning the parser and
> compiler, so it's not for free. Doing your own string parsing logic might
> be more efficient.
> Depends on how frequently you have to do that.
> Le 20 avr. 2016 07:57, "Gerald Wiltse" <jerrywil...@gmail.com> a écrit :
>
>> Wow, i just wrote that exact code basically... and started responding to
>> your email, but there were various drawbacks to this approach as I don't
>> want to have to define handling of every property by name... Then... it
>> hit me...
>>
>> def v = '1..10'
>> assert new GroovyShell().parse(v).run() == [1,2,3,4,5]
>>
>> It works!!!
>>
>> Something about the Eval works just a little bit differently than
>> GroovyShell i guess. Perhaps Dierk can explain.
>>
>> Last question, how expensive is this invocation of groovyshell and parse
>> and all that (resources wise)? So-so?
>>
>>
>> Gerald R. Wiltse
>> jerrywil...@gmail.com
>>
>>
>> On Wed, Apr 20, 2016 at 1:48 AM, Guillaume Laforge <glafo...@gmail.com>
>> wrote:
>>
>>> If you know it's a range when parsing that string, you can do this, with
>>> the toInteger() method:
>>>
>>> def rangeString = "123..455"
>>> def (String min, String max) = rangeString.tokenize("..")
>>> def range = min.toInteger()..max.toInteger()
>>>
>>> On Wed, Apr 20, 2016 at 7:26 AM, Gerald Wiltse <jerrywil...@gmail.com>
>>> wrote:
>>>
>>>> I don't see how that works in my case, maybe i'm missing something.
>>>>
>>>> I will clarify:
>>>>
>>>> I define a variable in web to represent the range: 14502..14520
>>>>
>>>> The web converts this to a string, and passes it into my code.
>>>>
>>>> My code then has to receive this string, and then construct a list from
>>>> it.
>>>>
>>>> I could do:
>>>>
>>>> String rangeString = passedInVar
>>>> (String min, String max) = rangeString.tokenize("..")
>>>> Range range = min..max
>>>>
>>>> But i was hoping for a universal "caster" loop which can detect and
>>>> cast the common types from strings:
>>>> Integers, lists, ranges, maps, booleans..
>>>>
>>>> 12345
>>>> ["this", "is", "Sample", "List"]
>>>> 14502..14520
>>>> ["key":"value","for":"maps"]
>>>> true
>>>>
>>>> I think eval works for all but ranges.
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> Gerald R. Wiltse
>>>> jerrywil...@gmail.com
>>>>
>>>>
>>>> On Wed, Apr 20, 2016 at 1:15 AM, Guillaume Laforge <glafo...@gmail.com>
>>>> wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> You can just replace the bounds with variables.
>>>>>
>>>>> def a = 1
>>>>> def b = 10
>>>>> def r = a..b
>>>>>
>>>>> Isn't that what you're looking for?
>>>>>
>>>>> Guillaume
>>>>>
>>>>>
>>>>> Le mercredi 20 avril 2016, Gerald Wiltse <jerrywil...@gmail.com> a
>>>>> écrit :
>>>>>
>>>>>> I can find no examples of different ways to create a range. There's
>>>>>> a plethora of examples on what you can do when you start by creating a
>>>>>> range like so: "1..10"
>>>>>>
>>>>>> But, how does one create a range when the min and max values are
>>>>>> stored in variables? There's no range constructor. I see that it's a
>>>>>> form
>>>>>> of a list, but I see no helper methods for dynamically creating ranges
>>>>>> given a min and max value.
>>>>>>
>>>>>> I even tried to get really fancy, but this evaluates to a string.
>>>>>>
>>>>>> def v = "10..15"
>>>>>> assert Eval.x(v, "return x").getClass().name ==
>>>>>> "java.lang.String"
>>>>>>
>>>>>> My use case is this. I populate a bunch of form fields with variable
>>>>>> definitions... but they all get passed to my code as strings. But I want
>>>>>> to
>>>>>> pass port ranges and lists and maps. So, the Eval() method is exactly
>>>>>> what
>>>>>> I needed.. it just isn't working for ranges.
>>>>>>
>>>>>> Regards,
>>>>>> Jerry
>>>>>>
>>>>>>
>>>>>> Gerald R. Wiltse
>>>>>> jerrywil...@gmail.com
>>>>>>
>>>>>>
>>>>>
>>>>> --
>>>>> Guillaume Laforge
>>>>> Apache Groovy committer & PMC Vice-President
>>>>> Product Ninja & Advocate at Restlet <http://restlet.com>
>>>>>
>>>>> Blog: http://glaforge.appspot.com/
>>>>> Social: @glaforge <http://twitter.com/glaforge> / Google+
>>>>> <https://plus.google.com/u/0/114130972232398734985/posts>
>>>>>
>>>>>
>>>>
>>>
>>>
>>> --
>>> Guillaume Laforge
>>> Apache Groovy committer & PMC Vice-President
>>> Product Ninja & Advocate at Restlet <http://restlet.com>
>>>
>>> Blog: http://glaforge.appspot.com/
>>> Social: @glaforge <http://twitter.com/glaforge> / Google+
>>> <https://plus.google.com/u/0/114130972232398734985/posts>
>>>
>>
>>
