Actually, if you wanted to do it programatically in code and you could
guarantee that each line had no more than one token, you could probably
make it work by creating regular expressions. Here is some pseudocode:
for each line in the template file
pull out the token name from the line
create a regular expression from the line that anchors both ends
and replaces the @token@ with a "(.*)"
read equivalent line from the resulting file
run regular expression on line
if no match
error out, this file was not generated from the template
value of token is group 1
register token name, token value in a Properties object (or
equivalent dict or hash construct)
write Properties object to disk
So in your example, the regular expression would be "^this (.*) file$"
and the group 1 match would give you "is a sample".
Translated into Java, this could be a custom task. Or it could be done
with some script in an ant build file.
You could even make it work with multiple tokens on a line so long as
enough characters showed up between the tokens that would not also show
up in the substitution values.
[EMAIL PROTECTED] wrote:
No there isnt.
And I think this cant be done:
If you combine the template with the property values you doesnt have any
markers where a property value starts and where it ends (if your template
doesnt provide these). Therefore you cant parse the resulting file.
Example:
template
this @value@ file
property
value=is a sample
result
this is a sample file
How you would parse the "this is a sample file" string?
Jan
-----Ursprüngliche Nachricht-----
Von: Patrick Martin [mailto:[EMAIL PROTECTED]
Gesendet: Donnerstag, 6. September 2007 10:18
An: Ant User
Betreff: extract properties from file and corresponding template
Hello,
I have a file that was generated from a template and a set of
properties using ant filters.
Basically, the template contained tokens like @my.property@ which
where replaced by the corresponding value of ${my.property}.
template + properties >>> file
Now, I'd like to be able to get the set of properties back from this
file and the corresponding template.
file + template >>> properties
Is there any task out there that already exists for that?
Thank you,
Patrick
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