man App::Info::Lib::Expat (3): Information about the Expat XML parser

SYNOPSIS

use App::Info::Lib::Expat;
my $expat = App::Info::Lib::Expat->new;
if ($expat->installed) {
print "App name: ", $expat->name, "\n";
print "Version: ", $expat->version, "\n";
print "Bin dir: ", $expat->bin_dir, "\n";
} else {
print "Expat is not installed. :-(\n";
}

DESCRIPTION

App::Info::Lib::Expat supplies information about the Expat XML parser installed on the local system. It implements all of the methods defined by App::Info::Lib. Methods that trigger events will trigger them only the first time they're called (See App::Info for documentation on handling events). To start over (after, say, someone has installed Expat) construct a new App::Info::Lib::Expat object to aggregate new meta data.

Some of the methods trigger the same events. This is due to cross-calling of shared subroutines. However, any one event should be triggered no more than once. For example, although the info event ``Searching for 'expat.h''' is documented for the methods "version()", "major_version()", "minor_version()", and "patch_version()", rest assured that it will only be triggered once, by whichever of those four methods is called first.

INTERFACE

Constructor

new

  my $expat = App::Info::Lib::Expat->new(@params);

Returns an App::Info::Lib::Expat object. See App::Info for a complete description of argument parameters.

When called, "new()" searches all of the paths returned by the "search_lib_dirs()" method for one of the files returned by the "search_lib_names()" method. If any of is found, then Expat is assumed to be installed. Otherwise, most of the object methods will return "undef".

Events:

info: Searching for Expat libraries
confirm: Path to Expat library directory?
unknown: Path to Expat library directory?

Class Method

key_name

  my $key_name = App::Info::Lib::Expat->key_name;

Returns the unique key name that describes this class. The value returned is the string ``Expat''.

Object Methods

installed

  print "Expat is ", ($expat->installed ? '' : 'not '),
    "installed.\n";

Returns true if Expat is installed, and false if it is not. App::Info::Lib::Expat determines whether Expat is installed based on the presence or absence on the file system of one of the files searched for when "new()" constructed the object. If Expat does not appear to be installed, then most of the other object methods will return empty values.

name

  my $name = $expat->name;

Returns the name of the application. In this case, "name()" simply returns the string ``Expat''.

version

Returns the full version number for Expat. App::Info::Lib::Expat attempts parse the version number from the expat.h file, if it exists.

Events:

info

Searching for 'expat.h'

Searching for include directory

error

Cannot find include directory

Cannot find 'expat.h'

Failed to parse version from 'expat.h'

unknown

Enter a valid Expat include directory

Enter a valid Expat version number

major_version

  my $major_version = $expat->major_version;

Returns the Expat major version number. App::Info::Lib::Expat attempts to parse the version number from the expat.h file, if it exists. For example, if "version()" returns ``1.95.2'', then this method returns ``1''.

Events:

info

Searching for 'expat.h'

Searching for include directory

error

Cannot find include directory

Cannot find 'expat.h'

Failed to parse version from 'expat.h'

unknown

Enter a valid Expat include directory

Enter a valid Expat major version number

minor_version

  my $minor_version = $expat->minor_version;

Returns the Expat minor version number. App::Info::Lib::Expat attempts to parse the version number from the expat.h file, if it exists. For example, if "version()" returns ``1.95.2'', then this method returns ``95''.

Events:

info

Searching for 'expat.h'

Searching for include directory

error

Cannot find include directory

Cannot find 'expat.h'

Failed to parse version from 'expat.h'

unknown

Enter a valid Expat include directory

Enter a valid Expat minor version number

patch_version

  my $patch_version = $expat->patch_version;

Returns the Expat patch version number. App::Info::Lib::Expat attempts to parse the version number from the expat.h file, if it exists. For example, "version()" returns ``1.95.2'', then this method returns ``2''.

Events:

info

Searching for 'expat.h'

Searching for include directory

error

Cannot find include directory

Cannot find 'expat.h'

Failed to parse version from 'expat.h'

unknown

Enter a valid Expat include directory

Enter a valid Expat patch version number

bin_dir

  my $bin_dir = $expat->bin_dir;

Since Expat includes no binaries, this method always returns false.

executable

  my $executable = $expat->executable;

Since Expat includes no executable program, this method always returns false.

inc_dir

  my $inc_dir = $expat->inc_dir;

Returns the directory path in which the file expat.h was found. App::Info::Lib::Expat searches for expat.h in the following directories:

/usr/local/include
/usr/include
/sw/include

Events:

info: Searching for include directory
error: Cannot find include directory
unknown: Enter a valid Expat include directory

lib_dir

  my $lib_dir = $expat->lib_dir;

Returns the directory path in which a Expat library was found. The files and paths searched are as described for the ``new'' constructor, as are the events.

so_lib_dir

  my $so_lib_dir = $expat->so_lib_dir;

Returns the directory path in which a Expat shared object library was found. It searches all of the paths in the "libsdirs" and "loclibpth" attributes defined by the Perl Config module --- plus /sw/lib (for all you Fink fans) --- for one of the following files:

libexpat.so
libexpat.so.0
libexpat.so.0.0.1
libexpat.dylib
libexpat.0.dylib
libexpat.0.0.1.dylib

Events:

info: Searching for shared object library directory
error: Cannot find shared object library directory
unknown: Enter a valid Expat shared object library directory

home_url

  my $home_url = $expat->home_url;

Returns the libexpat home page URL.

download_url

  my $download_url = $expat->download_url;

Returns the libexpat download URL.

search_lib_names

  my @seach_lib_names = $self->search_lib_nams

Returns a list of possible names for library files. Used by "lib_dir()" to search for library files. By default, the list is:

libexpat.a
libexpat.la
libexpat.so
libexpat.so.0
libexpat.so.0.0.1
libexpat.dylib
libexpat.0.dylib
libexpat.0.0.1.dylib

search_so_lib_names

  my @seach_so_lib_names = $self->search_so_lib_nams

Returns a list of possible names for shared object library files. Used by "so_lib_dir()" to search for library files. By default, the list is:

libexpat.so
libexpat.so.0
libexpat.so.0.0.1
libexpat.dylib
libexpat.0.dylib
libexpat.0.0.1.dylib

search_lib_dirs

  my @search_lib_dirs = $expat->search_lib_dirs;

Returns a list of possible directories in which to search for libraries. By default, it returns all of the paths in the "libsdirs" and "loclibpth" attributes defined by the Perl Config module --- plus /sw/lib (in support of all you Fink users out there).

search_inc_names

  my @search_inc_names = $expat->search_inc_names;

Returns a list of include file names to search for. Used by "inc_dir()" to search for an include file. By default, the only name returned is expat.h.

search_inc_dirs

  my @search_inc_dirs = $expat->search_inc_dirs;

Returns a list of possible directories in which to search for include files. Used by "inc_dir()" to search for an include file. By default, the directories are:

/usr/local/include
/usr/include
/sw/include

KNOWN ISSUES

This is a pretty simple class. It's possible that there are more directories that ought to be searched for libraries and includes. And if anyone knows how to get the version numbers, let me know!

The format of the version number seems to have changed recently (1.95.1-2), and now I don't know where to find the version number. Patches welcome.

SUPPORT

This module is stored in an open GitHub repository <http://github.com/theory/app-info/>. Feel free to fork and contribute!

Please file bug reports via GitHub Issues <http://github.com/theory/app-info/issues/> or by sending mail to [email protected] <mailto:[email protected]>.

AUTHOR

David E. Wheeler <[email protected]> based on code by Sam Tregar <[email protected]> that Sam, in turn, borrowed from Clark Cooper's XML::Parser module.

COPYRIGHT AND LICENSE

This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

SYNOPSIS

DESCRIPTION

INTERFACE

Constructor

Class Method

Object Methods

KNOWN ISSUES

SUPPORT

AUTHOR

COPYRIGHT AND LICENSE

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