Commits on Dec 18, 2017

1. Java Backend: Add line number support to match help documentation. …

   Currently the help message includes the following for Java:
     Special options for the Java backend
       -l                        Add and set line_number field for all syntax classes
   The only place this support existed was in the help documentation. A quick
   glance through the Java backend files will show that the Option.linenumbers was
   never inspected. This change adds that support for parsing.
   
   Cup's "Symbol" class only supports character offsets, so we use its
   "ComplexSymbol" class, which supports line, column, and offset. JLex does not
   provide column info, but JFlex does. ComplexSymbol tracks the left and right
   extents of a production, and so for variable length tokens we capture this info.
   
   The abstract syntax classes still do not record line information, but the
   necessary information is now available during parsing, and a follow-up commit
   will handle adding the info to the Absyn classes and code to record it to the
   generated cup file.

   

   iteratee committed Dec 18, 2017
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