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+ TXR 58
+ 2011-02-25
+
+
+ Features
+
+ - Exception handling exposed in TXR Lisp.
+
+ - range* function similar to range, but for generating a range with the
+ endpoint excluded.
+
+ - TXR Lisp can invoke a function in the pattern language now using
+ the new match-fun function.
+
+ - Braced variable syntax in @(output) extended to support arbitrary
+ expressions in place of the variable name. The expressions are converted
+ to text and then treated the same way as a variable substitution.
+ Indexing is allowed, and field-formatting takes place.
+ Moreover, these expressions are code-walked by @(repeat) and @(rep) to look
+ for embedded variables.
+
+ - New TXR Lisp functions ref, refset, sub and replace.
+
+ - Indexing and range extraction in brace substitution in @(output) clauses is
+ now generic over lists, vectors and strings.
+
+ - Optional arguments introduced into TXR Lisp, in defun and lambdas,
+ with a simple syntax involving a colon. Numerous intrinsic functions
+ have been converted such that some previously required arguments
+ are now optional.
+
+ - Sort function that was previously for lists only is now generic over
+ vectors and strings.
+
+ - New del operator in TXR Lisp can delete elements of sequences or hashes
+ which are denoted using the bracket syntax.
+
+ - Range indexing has "floating zero" behavior now so that for
+ example [seq -2 0] means the "last two elements": when the start of
+ the range is negative, then a zero end is treated as length plus one.
+
+ - TXR programs can now be split into multiple modules, using the load
+ directive to load and run code.
+
+ Bugs
+
+ - range function terminates lazy list when the sequence overshoots
+ the final value.
+
+ - Variable that holds nil is treated as a list in (set [var x..y] ...)
+ range assignment.
+
+ - Vestigial (t . obj) representation in exception handling code removed.
+
+ - TXR now does not not dump bindings if any output occured on a stream
+ connected to the C stdout stream. Previously, it suppressed printing
+ of bindings if @(output) was carried out on the *std-output* stream.
+
+ - Function remhash was found to be buggy and rewritten.
+
+
+
TXR 57
2011-02-14