These are several different questions

First let me warn you that your code has an error

This will fail if you don't care about indentation:

    if ( $line =~ /ObjectType1/ ) {
        $context = "ObjectType1" ;
    }
    if ( $line =~ /\}/ ) {
        $context = "" ;
    }
[download]

Here you rather want to test for /$\}/ at lines start!

My suggestions

• separate parsing of syntax logic from processing of semantic logic
• parse all lines of an object into a cache ( a string or nested hashes) before handling it
• with nested objects use recursion
• keep track of the indentation level, like counting open and closed braces
• you should handle parsing errors in case the input is corrupted
• use functions and packages instead of piling up if cases
• use a function dispatcher if you need to handle semantics of different "ObjectTypes"

Like this you will get reusable and maintainable code!

edit

some may miss example code, but you got a generic answer for a generic question.

Feel free to pick some points and ask for clarification.

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