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

[StrongZhu]

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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