Got a problem with proper expressions parsing. In the perlop there is a table with operators precedence. And there are three statements that confuses me.

Named operators (or subs) precedence is following:

• List operators (leftward)
• Named unary operators
• List operators (rightward)

As far as I understand this:

• First is any sub invocation with arguments in parens (or just empty parens).
• Second: my problem is here. What is named unary operators? Is this any sub with ($) prototype? How about built-ins? Is there any list of built-ins treated as named unary operators? The best would be to point me to perl sources part which is responsible to this. (I found some list in Programming perl, but I'm afraid it's incomplete).
• Third: problem continues here. Is this about any sub with non-($) prototype and args without parens? What about optional args? What about built ins?

Would be really nice to have a clear and unambiguous explanation (or algorythm) how should I do this. PPI doesn't help here.

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