CVS commit: pkgsrc/lang/maude

[Aleksej Saushev <asau%netbsd.org@localhost>]

Module Name:    pkgsrc
Committed By:   asau
Date:           Wed May 19 11:55:43 UTC 2010

Modified Files:
        pkgsrc/lang/maude: Makefile PLIST distinfo

Log Message:
Update to Maude 2.4

==================================
New features and changes since 2.3
==================================

(1) Maude 2.4 provides an order-sorted Ax-unification algorithm for
all order-sorted theories (CSigma, E U Ax) such that:
   - the signature Sigma is preregular modulo Ax;
   - the axioms Ax associated to function symbols are as follows:
        - there can be arbitrary function symbols and constants with
          no equational attributes;
        - the iter equational attribute can be declared for some unary
          symbols;
        - the comm or assoc comm attributes can be declared for some
          binary function symbols, but then no other equational
          attributes must be given for such symbols.
Explicitly excluded are theories with binary function symbols having
either: (i) the id:, left id:, or right id: attributes; or (ii) the
assoc attribute without the comm one; or (iii) a combination of (i)
and (ii).

(2) Unification is reflected in the META-LEVEL module by two descent
functions:
     op metaUnify : Module UnificationProblem Nat Nat ~>
                                     UnificationPair? [special (...)].
     op metaDisjointUnify : Module UnificationProblem Nat Nat ~>
                                   UnificationTriple? [special (...)].

(3) Statements (rule, equations and membership axioms) can now take a
print attribute. In print attribute mode, when a statement is executed
the items in its print attribute are printed, with variables taking
their value in the current substitution.

(4) Parsing of file names in the commands load, in, cd and pushd now
allows spaces using either of two syntactic conventions:
If the file name starts with " then all following characters will be
taken literally up to the terminating ", line feed or form feed.
If a file name starts with other than ", the following escape
sequences are recognized
   \\             becomes \
   \<space>       becomes <space>
   \"             becomes "

(5) For operators in the C, CU, CI and CUI theories, if both arguments
are the same, the rewrite, srewrite and search commands and the model
checker will only consider one of the arguments for that step since
only one rewriting step is made per pass, the choice of argument is
irrelevant. This already happened for operators in the AC and ACU
theories. The frewrite command still always considers all arguments
even if they are identical since multiple rewriting steps can happen
in each pass.

(6) The GNU libsigsegv library is used to distinguigh between true
segmentation faults and stack overflows and so stack overflows are now
reported with an informative message.

(7) Several optimizations, bug fixes and improvements.


To generate a diff of this commit:
cvs rdiff -u -r1.22 -r1.23 pkgsrc/lang/maude/Makefile
cvs rdiff -u -r1.6 -r1.7 pkgsrc/lang/maude/PLIST
cvs rdiff -u -r1.7 -r1.8 pkgsrc/lang/maude/distinfo

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.