Salesforce APEX Language Specification

I would like to know the exact specification of the APEX language (with all these grammars, etc.), but I spent half a day and finished almost nothing.

I know APEX is a Java-based language, but compiling its specification in itself is from the Java specification, and APEX stuff alone will be a pain.

Is there a place where I can get the APEX language specification?

For those who are not familiar with them - I am looking for this document http://docs.oracle.com/javase/specs/jls/se7/html/index.html .

Thanks in advance!