X-Git-Url: http://git.vpit.fr/?a=blobdiff_plain;f=README;h=03cda6c4d8172f1d6043e6857465f34c434f427c;hb=8d1e537ed209474d537750620e118f79455a883f;hp=7df17315e7e2370fefc25f04a2c3d49cacc5b50e;hpb=bcc72c6633aec36f391f879f8145c48bf7c9c4dc;p=perl%2Fmodules%2FVariable-Magic.git diff --git a/README b/README index 7df1731..03cda6c 100644 --- a/README +++ b/README @@ -2,7 +2,7 @@ NAME Variable::Magic - Associate user-defined magic to variables from Perl. VERSION - Version 0.23 + Version 0.28 SYNOPSIS use Variable::Magic qw/wizard cast dispell/; @@ -123,6 +123,12 @@ PERL MAGIC HISTORY *p14416* : 'copy' and 'dup' magic. + * 5.8.9 + + *p28160* : Integration of *p25854* (see below). + + *p32542* : Integration of *p31473* (see below). + * 5.9.3 *p25854* : 'len' magic is no longer called when pushing an element @@ -148,6 +154,10 @@ PERL MAGIC HISTORY *p32969* : 'len' magic is no longer invoked when calling "length" with a magical scalar. + *p34908* : 'len' magic is no longer called when pushing / unshifting + an element into a magical array in void context. The "push" part was + already covered by *p25854*. + CONSTANTS "SIG_MIN" The minimum integer used as a signature for user-defined magic. @@ -175,6 +185,10 @@ CONSTANTS True for perls that don't call 'len' magic when you push an element in a magical array. + "VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID" + True for perls that don't call 'len' magic when you unshift in void + context an element in a magical array. + "VMG_COMPAT_ARRAY_UNDEF_CLEAR" True for perls that call 'clear' magic when undefining magical arrays. @@ -192,19 +206,20 @@ CONSTANTS FUNCTIONS "wizard" - wizard sig => ..., - data => sub { ... }, - get => sub { my ($ref, $data) = @_; ... }, - set => sub { my ($ref, $data) = @_; ... }, - len => sub { my ($ref, $data, $len) = @_; ... ; return $newlen; }, - clear => sub { my ($ref, $data) = @_; ... }, - free => sub { my ($ref, $data) = @_, ... }, - copy => sub { my ($ref, $data, $key, $elt) = @_; ... }, - local => sub { my ($ref, $data) = @_; ... }, - fetch => sub { my ($ref, $data, $key) = @_; ... }, - store => sub { my ($ref, $data, $key) = @_; ... }, - exists => sub { my ($ref, $data, $key) = @_; ... }, - delete => sub { my ($ref, $data, $key) = @_; ... } + wizard sig => ..., + data => sub { ... }, + get => sub { my ($ref, $data) = @_; ... }, + set => sub { my ($ref, $data) = @_; ... }, + len => sub { my ($ref, $data, $len) = @_; ... ; return $newlen; }, + clear => sub { my ($ref, $data) = @_; ... }, + free => sub { my ($ref, $data) = @_, ... }, + copy => sub { my ($ref, $data, $key, $elt) = @_; ... }, + local => sub { my ($ref, $data) = @_; ... }, + fetch => sub { my ($ref, $data, $key) = @_; ... }, + store => sub { my ($ref, $data, $key) = @_; ... }, + exists => sub { my ($ref, $data, $key) = @_; ... }, + delete => sub { my ($ref, $data, $key) = @_; ... }, + copy_key => $bool This function creates a 'wizard', an opaque type that holds the magic information. It takes a list of keys / values as argument, whose keys @@ -227,17 +242,40 @@ FUNCTIONS * "get", "set", "len", "clear", "free", "copy", "local", "fetch", "store", "exists" and "delete" - Code references to corresponding magic callbacks. You don't have to - specify all of them : the magic associated with undefined entries + Code references to the corresponding magic callbacks. You don't have + to specify all of them : the magic associated with undefined entries simply won't be hooked. In those callbacks, $_[0] is always a reference to the magic object and $_[1] is always the private data - (or "undef" when no private data constructor was supplied). In the - special case of "len" magic and when the variable is an array, $_[2] - contains its normal length. $_[2] is the current key in "copy", - "fetch", "store", "exists" and "delete" callbacks, although for - "copy" it may just be a copy of the actual key so it's useless to - (for example) cast magic on it. "copy" magic also receives the - current element (i.e. the value) in $_[3]. + (or "undef" when no private data constructor was supplied). Other + arguments are specific to the magic hooked : + + - "len" + + When the variable is an array, $_[2] contains the normal + length. The callback is also expected to return the new + scalar or array length. + + - "copy" + + $_[2] is a either a copy or an alias of the current key, + which means that it is useless to try to change or cast + magic on it. $_[3] is an alias to the current element (i.e. + the value). + + - "fetch", "store", "exists" and "delete" + + $_[2] is an alias to the current key. Nothing prevents you + from changing it, but be aware that there lurk dangerous + side effects. For example, it may righteously be readonly if + the key was a bareword. You can get a copy instead by + passing "copy_key => 1" to "wizard", which allows you to + safely assign to $_[2] in order to e.g. redirect the action + to another key. This however has a little performance + drawback because of the copy. + + All the callbacks are expected to return an integer, which is passed + straight to the perl magic API. However, only the return value of + the "len" callback currently holds a meaning. # A simple scalar tracer my $wiz = wizard get => sub { print STDERR "got ${$_[0]}\n" }, @@ -358,7 +396,7 @@ SUPPORT . COPYRIGHT & LICENSE - Copyright 2007-2008 Vincent Pit, all rights reserved. + Copyright 2007-2009 Vincent Pit, all rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.