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NEWS for version 2.2                                               -*-text-*-

Interpreter Enhancements
========================


   1.  The ternary expression was added:  
   
           expression = condition ? val1 : val2

       If condition is non-zero, then expression = val1, 
        otherwise expression = val2

   2.  The break and condition statements support an optional integer
       that indicates how many loop levels the statement affects, e.g.,
       the break statement in

           while (1)
	     {
	         loop (10)
		    {
		        break 2;
		    }
	     }
	
       will cause both loops to be terminated.
       
   3.  Multiline strings have been added:
   
           "This is a \
	    multiline \
	    string"
	    
           `This is
	    another multiline
	    string that 
	    does not require 
	    a \ for continuation`

    4.  List_Type objects may be indexed using an array of indices
        instead of just a single scalar index.
	    

Modules
=======
 
   1.  zlib: A module that wraps the popular z compression library.

   2.  fork: A module that wraps the fork, exec*, and waitpid functions.
   
         slsh/lib/process.sl utilizes this module to allow an
	 application to easily create subprocesses and pipelines.

   3.  sysconf: Module that implements interfaces to the posix
       sysconf, pathconf, etc. functions.
	   

Intrinsic Functions
===================

   The following intrinsic functions have been added for 2.2:
   
      sumsq           
          equivalent to sum(x*x)

      expm1           
          More accurate version of exp(x)-1 for x near 0.

      log1p           
          More accurate version of log(1+x) for x near 0

      list_to_array   
          Creates an array from a list.

      string_matches
          A convenient alternative to string_match and string_match_nth
	  functions.
		       
      _close          
          Close an integer descriptor
      _fileno        
          Returns the descriptor as an integer

      dup2, getsid, killpg, getpriority/setpriority:
          Wraps the corresponding system functions.
	  
      ldexp, frexp:
          If x == a*2^b, where 0.5<=a<1.0 then (a,b)=frexp(x), 
	  and x=ldexp(a,b).

   The following functions have been enhanced:
      
      hypot
          If given a single array argument, it returns the equivalent
	  of sqrt(sum(X*X)).

      polynom
          The calling interface to this function was changed and
	  support added for arrays.

Misc
====

   Unicode tables updated to version 5.1.


=x=x=x=x=x=x=x=x=x=x=x=x=x=x=x=x=x=x=x=x=x=x=x=x=x=x=x=x=x=x=x=x=x=x=x

NEWS for version 2.1

Building the library
====================

   `make install' installs the shared version of the library.
   Previously `make install' installed just the static version and a
   separate step (`make install-elf') was required to install the
   shared version.  Now, `make install-static' is necessary to install
   the static one.

Interpreter News
=================

Syntax enhancements:
--------------------

   1.  Short circuiting boolean operators:
   
           if ((x == y) || (y == 3) && (x != 4)) ...

       (orelse and andelse are deprecated)
       
   2.  Structure definitions allow embdedded assignment expressions:
   
           s = struct {x = 3, name="foo", a = [1:10]};

   3.  Qualifiers (aka "keywords") added to the language:
   
           save_file ("foo.c"; overwrite=1);
	   plot_points ([1:10], sin([1:10]); color="red", style="solid");

   3.  Expressions such as (a < b < c) now interpreted to mean
       (a<b)and(b<c).

   4.  New keywords: ifnot, then
   
       ifnot may be used instead of !if, which has been deprecated.
       For "then" see the next item.

   5.  Looping constructs support a "then" clause that will get
       executed if the loop runs to completion, e.g.,
       
           loop (20)
	    {
	       if (this ())
	         break;  % The then clause will NOT get executed
	    }
	   then do_that ();
	   
   6.  A floating point array of exactly N elements may be created
       using the form [a:b:#N], where the elements are uniformly
       spaced and run from a to b, inclusive.
       
   7.  References to array elements and structure fields are
       supported, e.g., &A[3], &s.foo.
       
   8.  An exception may be rethrown by calling "throw" without any
       arguments:
       
           try { something (); }
	   catch AnyError: { do_this (); throw; }

New Intrinsic Functions:
------------------------

   wherenot(x) :
              Equivalent to where (not(x))

   _$(str) :
              Evaluates strings with embedded "dollar" variables, e.g.,
              _$("$TERM");

   __push_list/__pop_list :
              Push list items onto the stack

   prod(x) :
              Computes the product of an array a[0]*a[1]*...

   minabs(x), maxabs(x):
              Equivalent to min(abs(x)) and max(abs(x))
	      
   getpgrp,setgid, getpgid:
              Get and set the process group (Unix)
   setsid  :
              Create a new session


API News
========

  Although not new I feel that this point should be stressed now
  because it was not emphasized earlier: The SLarray_* functions that
  deal with indices or sizes use `SLindex_Type' instead of `int'.
  Currently, `SLindex_Type' is typedefed to be an `int', but this will
  change in a future version.  So for future compatibility, use
  `SLindex_Type' instead of `int' in functions that deal with slang
  arrays.  Similarly, instead of using SLang_pop_int for obtaining an
  array index, use SLang_pop_array_index.  See the array-specific
  examples in the documentation for more information.

  There have been significant enhancements to the slang readline
  interface.  The interface has been opened up to the interpreter
  allowing for such features as completion and a persistent history
  mechanism.  Applications wishing to take advantage of these features
  should use the new function `SLrline_open2' instead of
  `SLrline_open'.  For an example, see how this function is used in
  slsh/src/readline.c.

  SLclass_patch_intrin_fun_table was added to facilitiate the patching
  of intrinsic tables during runtime.  If you have created dynamically
  loaded modules, then you may have a good idea what this function is
  for.

  The SLang_Traceback variable is now interpreted as a bitmapped
  integer providing greater flexibility and control over traceback
  messages.
  
  SLerr_throw was added to permit applications to mimic the semantics
  of the `throw' statement.
  
  SLang_verror_va was added to support calling the error routines with
  a va_list argument.


slsh enhancements
=================

  When configured to use slang's readline routines, new features
  include filename completion and persistent history.
  
  The profiler was rewritten to be much more friendly, flexible, and
  more accurate.
  
  struct_filter and struct_combine defined in structfuns.sl have been
  made more flxible.  See their documentation for more information.
  
  A new function called readascii may be used for reading
  non-binary (or so-called "ascii") data files.

New modules
===========

  The following modules have been added:
   
      iconv:  Performs character-set conversion using the iconv library.
      onig:   A regular expression module using oniguruma RE library.
      rand:   A random number module