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authorSteve Langasek <vorlon@debian.org>2005-01-10 08:53:33 +0000
committerBryan Newbold <bnewbold@robocracy.org>2017-02-20 00:05:30 -0800
commite33f9eb9cf5cc29c36ce2aa7e10cd0f37ae0cc8e (patch)
treeabbf06041619e445f9d0b772b0d58132009d8234 /tree.txi
parentf559c149c83da84d0b1c285f0298c84aec564af9 (diff)
parent8466d8cfa486fb30d1755c4261b781135083787b (diff)
downloadslib-e33f9eb9cf5cc29c36ce2aa7e10cd0f37ae0cc8e.tar.gz
slib-e33f9eb9cf5cc29c36ce2aa7e10cd0f37ae0cc8e.zip
Import Debian changes 3a1-4.2debian/3a1-4.2
slib (3a1-4.2) unstable; urgency=low * Non-maintainer upload. * Add guile.init.local for use within the build dir, since otherwise we have an (earlier unnoticed) circular build-dep due to a difference between scm and guile. slib (3a1-4.1) unstable; urgency=low * Non-maintainer upload. * Build-depend on guile-1.6 instead of scm, since the new version of scm is wedged in unstable (closes: #281809). slib (3a1-4) unstable; urgency=low * Also check for expected creation on slibcat. (Closes: #240096) slib (3a1-3) unstable; urgency=low * Also check for /usr/share/guile/1.6/slib before installing for guile 1.6. (Closes: #239267) slib (3a1-2) unstable; urgency=low * Add format.scm back into slib until gnucash stops using it. * Call guile-1.6 new-catalog (Closes: #238231) slib (3a1-1) unstable; urgency=low * New upstream release * Remove Info section from doc-base file (Closes: #186950) * Remove period from end of description (linda, lintian) * html gen fixed upstream (Closes: #111778) slib (2d4-2) unstable; urgency=low * Fix url for upstream source (Closes: #144981) * Fix typo in slib.texi (enquque->enqueue) (Closes: #147475) * Add build depends. slib (2d4-1) unstable; urgency=low * New upstream. slib (2d3-1) unstable; urgency=low * New upstream. * Remove texi2html call in debian/rules. Now done upstream. Add make html instead. * Changes to rules and doc-base to conform to upstream html gen * Clean up upstream makefile to make sure it cleans up after itself.
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+@code{(require 'tree)}
+@ftindex tree
+
+These are operations that treat lists a representations of trees.
+
+
+@defun subst new old tree
+@defunx substq new old tree
+@defunx substv new old tree
+
+
+@defunx subst new old tree equ?
+@code{subst} makes a copy of @var{tree}, substituting @var{new} for
+every subtree or leaf of @var{tree} which is @code{equal?} to @var{old}
+and returns a modified tree. The original @var{tree} is unchanged, but
+may share parts with the result.
+
+@code{substq} and @code{substv} are similar, but test against @var{old}
+using @code{eq?} and @code{eqv?} respectively. If @code{subst} is
+called with a fourth argument, @var{equ?} is the equality predicate.
+
+Examples:
+@lisp
+(substq 'tempest 'hurricane '(shakespeare wrote (the hurricane)))
+ @result{} (shakespeare wrote (the tempest))
+(substq 'foo '() '(shakespeare wrote (twelfth night)))
+ @result{} (shakespeare wrote (twelfth night . foo) . foo)
+(subst '(a . cons) '(old . pair)
+ '((old . spice) ((old . shoes) old . pair) (old . pair)))
+ @result{} ((old . spice) ((old . shoes) a . cons) (a . cons))
+@end lisp
+@end defun
+
+@defun copy-tree tree
+
+Makes a copy of the nested list structure @var{tree} using new pairs and
+returns it. All levels are copied, so that none of the pairs in the
+tree are @code{eq?} to the original ones -- only the leaves are.
+
+Example:
+@lisp
+(define bar '(bar))
+(copy-tree (list bar 'foo))
+ @result{} ((bar) foo)
+(eq? bar (car (copy-tree (list bar 'foo))))
+ @result{} #f
+@end lisp
+@end defun