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<TITLE>Devel::Symdump - dump symbol names or the symbol table</TITLE>
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<STRONG><P CLASS=block> Devel::Symdump - dump symbol names or the symbol table</P></STRONG>
</TD></TR>
</TABLE>
<A NAME="__index__"></A>
<!-- INDEX BEGIN -->
<UL>
<LI><A HREF="#name">NAME</A></LI><LI><A HREF="#supportedplatforms">SUPPORTED PLATFORMS</A></LI>
<LI><A HREF="#synopsis">SYNOPSIS</A></LI>
<LI><A HREF="#incompatibility alert">INCOMPATIBILITY ALERT</A></LI>
<LI><A HREF="#description">DESCRIPTION</A></LI>
<UL>
<LI><A HREF="#devel::symdump>rnew(@packages)"><CODE>Devel::Symdump->rnew(@packages)</CODE></A></LI>
<LI><A HREF="#devel::symdump>new(@packages)"><CODE>Devel::Symdump->new(@packages)</CODE></A></LI>
</UL>
<LI><A HREF="#subclassing">SUBCLASSING</A></LI>
<LI><A HREF="#authors">AUTHORS</A></LI>
</UL>
<!-- INDEX END -->
<HR>
<P>
<H1><A NAME="name">NAME</A></H1>
<P>Devel::Symdump - dump symbol names or the symbol table</P>
<P>
<HR>
<H1><A NAME="supportedplatforms">SUPPORTED PLATFORMS</A></H1>
<UL>
<LI>Linux</LI>
<LI>Solaris</LI>
<LI>Windows</LI>
</UL>
<HR>
<H1><A NAME="synopsis">SYNOPSIS</A></H1>
<PRE>
# Constructor
require Devel::Symdump;
@packs = qw(some_package another_package);
$obj = Devel::Symdump->new(@packs); # no recursion
$obj = Devel::Symdump->rnew(@packs); # with recursion
</PRE>
<PRE>
# Methods
@array = $obj->packages;
@array = $obj->scalars;
@array = $obj->arrays;
@array = $obj->hashs;
@array = $obj->functions;
@array = $obj->filehandles; # deprecated, use ios instead
@array = $obj->dirhandles; # deprecated, use ios instead
@array = $obj->ios;
@array = $obj->unknowns;</PRE>
<PRE>
$string = $obj->as_string;
$string = $obj->as_HTML;
$string = $obj1->diff($obj2);</PRE>
<PRE>
$string = Devel::Symdump->isa_tree; # or $obj->isa_tree
$string = Devel::Symdump->inh_tree; # or $obj->inh_tree</PRE>
<PRE>
# Methods with autogenerated objects
# all of those call new(@packs) internally
@array = Devel::Symdump->packages(@packs);
@array = Devel::Symdump->scalars(@packs);
@array = Devel::Symdump->arrays(@packs);
@array = Devel::Symdump->hashes(@packs);
@array = Devel::Symdump->functions(@packs);
@array = Devel::Symdump->ios(@packs);
@array = Devel::Symdump->unknowns(@packs);</PRE>
<P>
<HR>
<H1><A NAME="incompatibility alert">INCOMPATIBILITY ALERT</A></H1>
<P>Perl 5.003 already offered the opportunity to test for the individual
slots of a GLOB with the *GLOB{XXX} notation. Devel::Symdump version
2.00 uses this method internally which means that the type of
undefined values is recognized in general. Previous versions
couldn&39;t determine the type of undefined values, so the slot
<EM>unknowns</EM> was invented. From version 2.00 this slot is still present
but will usually not contain any elements.</P>
<P>The interface has changed slightly between the perl versions 5.003 and
5.004. To be precise, from perl5.003_11 the names of the members of a
GLOB have changed. <CODE>IO</CODE> is the internal name for all kinds of
input-output handles while <CODE>FILEHANDLE</CODE> and <CODE>DIRHANDLE</CODE> are
deprecated.</P>
<P><CODE>Devel::Symdump</CODE> accordingly introduces the new method <CODE>ios()</CODE> which
returns filehandles <STRONG>and</STRONG> directory handles. The old methods
<CODE>filehandles()</CODE> and <CODE>dirhandles()</CODE> are still supported for a transitional
period. They will probably have to go in future versions.</P>
<P>
<HR>
<H1><A NAME="description">DESCRIPTION</A></H1>
<P>This little package serves to access the symbol table of perl.</P>
<P>
<H2><A NAME="devel::symdump>rnew(@packages)"><CODE>Devel::Symdump->rnew(@packages)</CODE></A></H2>
<P>returns a symbol table object for all subtrees below @packages.
Nested Modules are analyzed recursively. If no package is given as
argument, it defaults to <CODE>main</CODE>. That means to get the whole symbol
table, just do a <CODE>rnew</CODE> without arguments.</P>
<P>
<H2><A NAME="devel::symdump>new(@packages)"><CODE>Devel::Symdump->new(@packages)</CODE></A></H2>
<P>does not go into recursion and only analyzes the packages that are
given as arguments.</P>
<P>The methods packages(), scalars(), arrays(), hashes(), functions(),
ios(), and <CODE>unknowns()</CODE> each return an array of fully qualified
symbols of the specified type in all packages that are held within a
Devel::Symdump object, but without the leading <CODE>$</CODE>, <CODE>@</CODE> or <CODE>%</CODE>. In
a scalar context, they will return the number of such symbols.
Unknown symbols are usually either formats or variables that haven&39;t
yet got a defined value.</P>
<P><CODE>As_string()</CODE> and <CODE>as_HTML()</CODE> return a simple string/HTML representations
of the object.</P>
<P><CODE>Diff()</CODE> prints the difference between two Devel::Symdump objects in
human readable form. The format is similar to the one used by the
as_string method.</P>
<P><CODE>Isa_tree()</CODE> and <A HREF="#item_inh_tree"><CODE>inh_tree()</CODE></A> both return a simple string representation
of the current inheritance tree. The difference between the two
methods is the direction from which the tree is viewed: top-down or
bottom-up. As I&39;m sure, many users will have different expectation
about what is top and what is bottom, I&39;ll provide an example what
happens when the Socket module is loaded:</P>
<DL>
<DT><STRONG><A NAME="item_inh_tree">% print Devel::Symdump->inh_tree</A></STRONG><BR>
<DD>
<PRE>
AutoLoader
DynaLoader
Socket
DynaLoader
Socket
Exporter
Carp
Config
Socket</PRE>
<P>The inh_tree method shows on the left hand side a package name and
indented to the right the packages that use the former.</P>
<DT><STRONG><A NAME="item_isa_tree">% print Devel::Symdump->isa_tree</A></STRONG><BR>
<DD>
<PRE>
Carp
Exporter
Config
Exporter
DynaLoader
AutoLoader
Socket
Exporter
DynaLoader
AutoLoader</PRE>
<P>The isa_tree method displays from left to right ISA relationships, so
Socket IS A DynaLoader and DynaLoader IS A AutoLoader. (At least at
the time this manpage was written :-)</P>
</DL>
<P>You may call both methods, <A HREF="#item_isa_tree"><CODE>isa_tree()</CODE></A> and inh_tree(), with an
object. If you do that, the object will store the output and retrieve
it when you call the same method again later. The typical usage would
be to use them as class methods directly though.</P>
<P>
<HR>
<H1><A NAME="subclassing">SUBCLASSING</A></H1>
<P>The design of this package is intentionally primitive and allows it to
be subclassed easily. An example of a (maybe) useful subclass is
Devel::Symdump::Export, a package which exports all methods of the
Devel::Symdump package and turns them into functions.</P>
<P>
<HR>
<H1><A NAME="authors">AUTHORS</A></H1>
<P>Andreas Koenig <EM><<A HREF="mailto:koenig@franz.ww.TU-Berlin.DE">koenig@franz.ww.TU-Berlin.DE</A>></EM> and Tom
Christiansen <EM><<A HREF="mailto:tchrist@perl.com">tchrist@perl.com</A>></EM>. Based on the old
<EM>dumpvar.pl</EM> by Larry Wall.</P>
<TABLE BORDER=0 CELLPADDING=0 CELLSPACING=0 WIDTH=100%>
<TR><TD CLASS=block VALIGN=MIDDLE WIDTH=100% BGCOLOR="#cccccc">
<STRONG><P CLASS=block> Devel::Symdump - dump symbol names or the symbol table</P></STRONG>
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