[help] how to know "at least one variable was parsed in the template"??

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hi,
  I seldom use mail list, so I'm not sure how many person can read this
email.

  here is my questions:

  I have a hash reference :
hash_ref = {
            var_HOST => "1",
            var_USER => "abc",
            var_PROC => "def",
            var_OUTPUT_PATH => "/home/runner/[% var_HOST %]/[% var_USER
%]/[% var_PROC %]/",
 }

  want to resolve all variables this "hash_ref" first,
  then use this hash_ref to parse another template.

  I want to :

do
{
  for each (var_i in this hash_ref)
  {
    try to parse 'var_i' with this hash,
    if (*NOTHING was parsed*),  ignore this var_i
    if (failed to parse it) {ignore this var_i for now, maybe it can be
parse successfully later}
    else , e.g. for 'var_OUTPUT_PATH', parse it, overwrite this var_i

  }
} while (at least one var was parsed in this do-while loop)


  so, must know *whether the "parse" procedure at least parsed one
variable. or not*

  is there any way do achieve this ??

  thanks.





Sincerely

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<div dir=3D"ltr">hi,<div>=C2=A0 I seldom use mail list, so I&#39;m not sure=
 how many person can read this email.</div><div><br></div><div>=C2=A0 here =
is my questions:</div><div><br></div><div>=C2=A0 I have a hash reference :<=
/div><div>hash_ref =3D {</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 var_HOST=C2=A0=3D&gt; &quot;1&quot;,</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 var_USER=C2=A0=3D&gt; &quot;abc&quot;,</div><div>=C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 var_PROC=C2=A0=3D&gt; &quot;def&quot;,</=
div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 var_OUTPUT_PATH=C2=A0=3D=
&gt; &quot;/home/runner/[% var_HOST %]/[% var_USER %]/[% var_PROC %]/&quot;=
,</div><div>=C2=A0}</div><div><br></div><div>=C2=A0 want to resolve all var=
iables this &quot;hash_ref&quot; first,=C2=A0</div><div>=C2=A0 then use thi=
s hash_ref to parse another template.</div><div><br></div><div>=C2=A0 I wan=
t to :</div><div><br></div><div>do</div><div>{</div><div>=C2=A0 for each (v=
ar_i in this hash_ref)</div><div>=C2=A0 {</div><div>=C2=A0 =C2=A0 try to pa=
rse &#39;var_i&#39; with this hash,</div><div>=C2=A0 =C2=A0 if (<b>NOTHING =
was parsed</b>), =C2=A0ignore this var_i<br></div><div>=C2=A0 =C2=A0 if (fa=
iled to parse it) {ignore this var_i for now, maybe it can be parse success=
fully later}<br></div><div>=C2=A0 =C2=A0 else , e.g. for &#39;var_OUTPUT_PA=
TH&#39;, parse it, overwrite this var_i</div><div><br></div><div>=C2=A0 }</=
div><div>} while (at least one var was parsed in this do-while loop)</div><=
div><br></div><div><br></div><div>=C2=A0 so, must know <u><b>whether the &q=
uot;parse&quot; procedure at least parsed one variable. or not</b></u></div=
><div><br></div><div>=C2=A0 is there any way do achieve this ??</div><div><=
br></div><div>=C2=A0 thanks.</div><div><br></div><div>=C2=A0=C2=A0</div><di=
v><br></div><div><br><div><br></div><div>Sincerely</div></div></div>

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