[cvs-nhc98] Improvements to hat-explore.

[Malcolm Wallace]

malcolm: Thu Feb  7 18:27:09 CET 2002

Update of /usr/src/master/nhc/src/hat/tools
In directory hinken:/tmp/cvs-serv10105

Modified Files:
	HatExplore.hs Makefile SExp.hs utils.c utils.h 
Added Files:
	LowLevel.hs 
Log Message:
Improvements to hat-explore.
  * Use a different low-level interface which gives correct parent
    information for identifiers, constructors, and literals.
  * In the state, store a stack of sub-expression contexts, not just
    expressions.  Thus, when you go backwards up the display, the cursor
    returns to the previously selected subexpression, not the whole line.