From: Intransition <transfire@...>
Date: 2011-11-13T07:17:39+09:00
Subject: Re: Advanced Ruby: Eval over multiple Bindings?

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On Saturday, November 12, 2011 4:10:09 PM UTC-5, Quintus wrote:
>
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> Am 12.11.2011 21:19, schrieb Intransition:
> > Is there a way to "merge" the binding to do something like:
> >=20
> > eval('a + b', binding1 + binding2)  #=3D> 3
>
> Not sure if that=E2=80=99s exactly what you want, but this works:
>
>   binding1.eval("a + binding2.eval('b')") #=3D> 3
>
> This is not 'merging' the two bindings, it rather opens the second
> binding inside the first one.
>

My usecase is for template generation. For example ERB, it's render method=
=20
takes *a* Binding.

=20

> Regarding Binding#eval, is there a specific reason why it can=E2=80=99t t=
ake a
> block instead of a string, the same way e.g. Module#instance_eval does?
>

Actually I suggested that feature on ruby issue tracker and I believe the=
=20
anwser given was YAGNI.

If it were possible could it solve this?



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On Saturday, November 12, 2011 4:10:09 PM UTC-5, Quintus wrote:<blockquote =
class=3D"gmail_quote" style=3D"margin: 0;margin-left: 0.8ex;border-left: 1p=
x #ccc solid;padding-left: 1ex;">-----BEGIN PGP SIGNED MESSAGE-----<br>Hash=
: SHA1<p>Am 12.11.2011 21:19, schrieb Intransition:<br>&gt; Is there a way =
to "merge" the binding to do something like:<br>&gt; <br>&gt; eval('a + b',=
 binding1 + binding2) &nbsp;#=3D&gt; 3</p><p>Not sure if that=E2=80=99s exa=
ctly what you want, but this works:</p><p>&nbsp; binding1.eval("a + binding=
2.eval('b')") #=3D&gt; 3</p><p>This is not 'merging' the two bindings, it r=
ather opens the second<br>binding inside the first one.</p></blockquote><di=
v><br></div><div>My usecase is for template generation. For example ERB, it=
's render method takes <i>a</i> Binding.</div><div><br></div><div>&nbsp;</d=
iv><blockquote class=3D"gmail_quote" style=3D"margin: 0;margin-left: 0.8ex;=
border-left: 1px #ccc solid;padding-left: 1ex;"><p>Regarding Binding#eval, =
is there a specific reason why it can=E2=80=99t take a<br>block instead of =
a string, the same way e.g. Module#instance_eval does?</p></blockquote><div=
><br></div><div>Actually I suggested that feature on ruby issue tracker and=
 I believe the anwser given was YAGNI.</div><div><br></div><div>If it were =
possible could it solve this?<br></div><div><br></div><div><br></div><block=
quote class=3D"gmail_quote" style=3D"margin: 0;margin-left: 0.8ex;border-le=
ft: 1px #ccc solid;padding-left: 1ex;"><p></p><p></p><p></p><p></p><p></p><=
p></p><p></p><p></p></blockquote>
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