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package Object::Import; |
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use warnings; |
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our $VERSION = 1.005; |
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=head1 NAME |
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Object::Import - import methods of an object as functions to a package |
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=head1 SYNOPSIS |
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use Object::Import $object; |
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foo(@bar); # now means $object->foo(@bar); |
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=head1 DESCRIPTION |
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This module lets you call methods of a certain object more easily by |
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exporting them as functions to a package. The exported functions are |
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not called as methods and do not receive an object argument, but instead |
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the object is fixed at the time you import them with this module. |
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You use the module with the following syntax: |
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use Object::Import $object, %options; |
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Here, C<$object> is the object from which you want to import the methods. |
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This can be a perl object (blessed reference), or the name of a package |
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that has class methods. |
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As usual, a C |
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take care not to use values that you compute only in run-time, eg. |
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my $object = Foo::Bar->new(); |
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use Object::Import $object; # WRONG: $object is not yet initialized |
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Instead, you have to create the object before you import, such as |
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use Object::Import Foo::Bar->new(); |
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You can also call import in run-time, eg. |
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use Object::Import (); |
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my $object = Foo::Bar->new(); |
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import Object::Import $object; |
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but in that case, you can't call the imported functions without parenthesis. |
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If you don't give an explicit list of methods to export, Object::Import |
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tries to find out what callable methods the object has and import |
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all of them. Some methods are excluded from exporting in this case, |
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namely any methods where exporting would overwrite a function existing |
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in the target package or would override a builtin function, also |
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any methods with names that are special to perl, such as C, |
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and any methods whose name starts with an underscore. This automatic |
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search for methods is quite fragile because of the way perl OO works, |
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so it can find subroutines that shouldn't actually be called as methods, |
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or not find methods that can actually be called. In particular, even |
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if you import an object from a purely object oriented module, it can |
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find non-method subs imported from other (non-OO) modules. |
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If you do give a list of methods to export, Object::Import trusts you |
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know what you mean, so it exports all those subs even if it has to |
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replace existing subs or break something else. |
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=head1 OPTIONS |
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The following import options can be passed to the module. |
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=over |
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=item C<< list => >> I<$arrayref> |
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Sets the list of methods to export, instead of the module deciding automatically. |
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I<$arrayref> must be a reference to an array containing method names. Eg. |
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use Object::Import LWP::UserAgent->new, list => |
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[qw"get post head mirror request simple_request"]; |
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=item C<< target => >> I<$package_name> |
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Export the sub names to the given namespace. Default is the package |
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from where you call import. |
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=item C<< deref => 1 >> |
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Signals that the first import argument, instead of being the object |
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itself, is a reference to a scalar that contains the object. |
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The content of this scalar may later be changed, and the imported |
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functions will be called on the new contents. (The scalar may even be |
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filled with undef, as long as you don't call the functions at that time.) |
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If you don't pass the list of methods explicitly, the content of the |
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scalar at the time of the import is used for determining the methods as |
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a template to determine the methods. If, however, you give the list |
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of methods, the content of the scalar is not examined at the time of |
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the import. |
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=item C<< prefix => >> I<$string> |
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Prepends a string to the names of functions imported. This is useful if |
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some of the method names are the same as existing subs or builtins. Eg. |
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use Object::Import $object, prefix => "foo"; |
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foo_bar(); # calls $object->bar(); |
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=item C<< suffix => >> I<$string> |
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Like the prefix option, only the string is appended. |
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=item C<< underscore => 1 >> |
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Consider a method for automatic inclusion even if its name starts with |
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an underscore. Such methods are normally excluded, because they are |
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usually used as private subs. |
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=item C<< exclude_methods => >> I<$hashref> |
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Sets a list of additional methods that are not automatically imported. |
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The argument must be a reference to a hash whose keys are potential |
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method names. Ignored if you use the C option. |
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=item C<< exclude_imports => >> I<$hashref> |
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Sets a list of additional sub names which the module must never use as |
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names of imported subs. These names are thus compared not with the |
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original method names, but the names possibly transformed by adding |
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prefixes and suffixes. This applies even if you give an explicit C |
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of methods to import. |
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=item C<< savenames => >> I<$hashref> |
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Save the (unqualified) names of the functions exported by adding them |
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as a key to a hash (the value is incremented with the ++ operator). |
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This could be useful if you wanted to reexport them with Exporter. |
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I<$arrayref> must be a real reference to a hash, not an undef. |
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=item C<< nowarn_redefine => 1 >> |
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Do not warn when an existing sub is redefined. That is currently only |
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possible if you give the list of methods to be exported explicitly with |
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the C option, because if the module chooses automatically then it |
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will not redefine subs. |
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=item C<< nowarn_nomethod => 1 >> |
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Suppress the warning when you try to import methods from an object you |
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might have passed in by mistake. Namely the object could be the name |
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of a nonexistent package, a string that is not a valid package name, |
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an unblessed object, or undef. Such values either don't currently have |
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any methods, or calling methods on them is impossible. That warning |
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often indicates that you passed the wrong value to Object::Import or |
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forgot to require a package. |
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=item C<< debug => 1 >> |
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Print debugging messages about what the module exports. |
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=back |
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=head1 NOTES |
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=head2 Importing from IO handles |
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It is possible to use an IO handle as the object to export methods from. |
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If you do this, you should require IO::Handle first so that the handle |
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actually has methods. You should probably also use the prefix or suffix |
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option in such a case, because many methods of handles have the same name |
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as a builtin function. |
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The handle must not be a symbolic reference, whether qualified or |
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unqualified, eg. |
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open FOO, "<", "somefile" or die; |
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use Object::Import "FOO"; # WRONG |
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You can pass a handle as a glob, reference to glob, or an IO::Handle |
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object, so any of these would work as the object after the above open |
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statement: C<*FOO>, C<\*FOO>, C<*FOO{IO}>. Another way to pass an |
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IO::Handle object would be like this: |
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use IO::File; |
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use Object::Import IO::File->new("somefile", "<"); |
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=head2 Changing the object |
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The C<< deref >> option deserves special mention. |
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This option adds a level of indirection to the imported functions: |
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instead of them calling methods on an object passed to import, |
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the methods are called on the object currently contained by a scalar |
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to which a reference is passed in to import. |
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This can be useful for various reasons: |
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operating on multiple objects throughout the course of the program, |
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being able to import the functions at compile time before you create the object, |
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or being able to destroy the object. |
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The first of this use is straightforward, |
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but you may need to know the following for the other two uses. |
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The list of methods imported is decided at the time you call import, |
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and will not be changed later, |
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no matter how the object is changed or methods the object supports are changed. |
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You thus have to do extra loops if you want to call import |
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before the object is available. |
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The simplest solution is to pass the list of methods you want explicitly |
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using the I<< list >> option. |
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If for some reason you don't want to do this, |
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you need to fill the scalar with a suitable prototype object |
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that has all the methods of the actual object you want to use. |
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In many cases, |
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the package name the object will be blessed to is a suitable prototype, |
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but note that if you do not control the module implementing the object, |
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then that module may not guarantee |
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what package the object will actually be blessed to: |
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the package may depend on some run-time parameters |
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and the details about this could change in future versions of the module. |
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This is, of course, not specific to the deref option, |
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but true to a lesser extent to any case when you're using |
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Object::Import without an explicit list of methods: |
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a future version of the module could create the methods of the class |
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in runtime or AUTOLOAD them without declaring them, |
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or it could add new private methods that will clash with function names you're using. |
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Nevertheless, using the classname as a prototype can be a useful trick |
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in quick and dirty programs, |
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or if you are in control of the implementation of the object. |
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225
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Now let's hear about destroying an object that may hold resources you want to free. |
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Object::Import guarantees that if you use the I<< deref >> option, |
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it does not hold references to the object other than through the one scalar, |
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so if undef the contents of that scalar, |
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the object will be freed unless there are references from somewhere else. |
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Finally, there's one thing you don't want to know but I must document it for completeness: |
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if a method called through Object::Import changes its invocant (zeroth argument), |
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that will also change the object the imported functions refer to, |
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whether you use the deref option or not, |
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and will change the contents of the scalar if you use the deref option. |
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=head1 EXAMPLES |
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239
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Our examples assume the following declarations: |
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use feature "say"; |
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=head2 Basic usage |
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First a simple example of importing class methods. |
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use Math::BigInt; |
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use Object::Import Math::BigInt::; |
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say new("0x100"); |
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This prints 256, because Math::BigInt->new("0x100") creates a big integer equal to 256. |
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Now let's see a simple example of importing object methods. |
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use Math::BigInt; |
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use Object::Import Math::BigInt->new("100"); |
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say bmul(2); |
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say as_hex(); |
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This prints 200 (2 multiplied by 100), then 0xc8 (100 as hexadecimal). |
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=head2 Multiple imports |
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Now let's see a more complicated example. This prints the leading news from the English |
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Wikinews website. |
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use warnings; use strict; |
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use LWP::UserAgent; |
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use XML::Twig; |
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use Object::Import LWP::UserAgent->new; |
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my $response = get "http://en.wikinews.org/wiki/Special:Export?". |
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"pages=Template:Lead_article_1&limit=1"; |
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import Object::Import $response; |
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if (is_success()) { |
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use Object::Import XML::Twig->new; |
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parse content(); |
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for my $parmname (qw"title summary") { |
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first_elt("text")->text =~ /\|\s*$parmname\s*=([^\|\}]+)/ or die; |
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print $1; |
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} |
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} else { |
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die message(); |
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} |
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For example, as I am writing this (2010-09-05), this outputs |
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=over |
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289
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Magnitude 7.0 earthquake hits New Zealand |
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An earthquake with magnitude 7.0 occurred near South Island, New |
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Zealand at Saturday 04:35:44 AM local time (16:35:44 UTC). The |
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earthquake occurred at a depth of 16.1 kilometers (10.0 miles). The |
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earthquake was reported to have caused widespread damage and power |
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outages. Several aftershocks were also reported. |
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297
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=back |
298
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299
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In this, C refers to the useragent object; C, C |
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and C refers to the response object (and these must be called |
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with a parenthesis); while C and C refer to the |
302
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twig object. This is not a good example to follow: it's quite fragile, |
303
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and not only because of the simple regex used to parse out the right |
304
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parts, but because if a new sub is added to a future version of the |
305
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L or L classes, they might suddenly get |
306
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imported and would shadow the methods we're supposed to import later. |
307
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308
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=head2 Suffix |
309
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310
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Now let's see an example of using a suffix. |
311
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312
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use File::Temp; |
313
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use Object::Import scalar(File::Temp->new()), suffix => "temp"; |
314
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printtemp "hello, world\nhidden"; |
315
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seektemp 0, 0; |
316
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|
print getlinetemp; |
317
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say filenametemp; |
318
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319
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Here we need the suffix because print and seek are names of builtin |
320
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functions. |
321
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322
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=head2 Creating the object later |
323
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324
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Let's see how we can import methods before we create an object. |
325
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326
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use Math::BigInt; |
327
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our $number; |
328
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use Object::Import \$number, deref => 1, list => ["bmul"]; |
329
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sub double { bmul 2 } |
330
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$number = Math::BigInt->new("100"); |
331
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say double; |
332
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333
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This will output 200. |
334
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|
Notice how here we're using the bmul function without parenthesis, |
335
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so we must import it compile time for the code to parse correctly, |
336
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but the object is not created till later. |
337
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338
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|
=head2 Prototype object |
339
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340
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This code is the same as above, |
341
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except that instead of supplying a list of methods, |
342
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|
we use a prototype object, namely the Math::BigInt package. |
343
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|
At least one of the two is needed, for otherwise Object::Import |
344
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would have no way to know what methods to import. |
345
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346
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|
use Math::BigInt; |
347
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|
our $number; |
348
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|
use Object::Import \($number = Math::BigInt::), deref => 1; |
349
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|
|
sub double { bmul 2 } |
350
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|
$number = Math::BigInt->new("100"); |
351
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|
|
say double; |
352
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353
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|
|
=head2 Exporting to other package |
354
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355
|
|
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|
|
This example shows how to export to a different namespace. |
356
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|
|
This is useful if you want to write your own |
357
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|
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|
|
sugar module that provides a procedural syntax: |
358
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359
|
|
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|
|
package My::Object::DSL; |
360
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|
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|
|
use Object::Import; |
361
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|
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|
|
use My::Object; |
362
|
|
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|
|
363
|
|
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|
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|
|
sub import { |
364
|
|
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|
|
|
|
my ($class, %options); |
365
|
|
|
|
|
|
|
if (@_ == 2) { |
366
|
|
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|
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|
|
($class, $options{ name }) = @_; |
367
|
|
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|
|
} else { |
368
|
|
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|
|
($class, %options) = @_; |
369
|
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|
|
}; |
370
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|
|
my $target = delete $options{ target } || caller; |
371
|
|
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|
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|
|
my $name = delete $options{ name } || '$obj'; |
372
|
|
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|
|
|
|
my $obj = My::Object->new(%options); |
373
|
|
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374
|
|
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|
|
$name =~ s/^[\$]// |
375
|
|
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|
|
or croak 'Variable name must start with $'; |
376
|
|
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|
|
{ |
377
|
|
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|
|
no strict 'refs'; |
378
|
|
|
|
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|
|
*{"$target\::$name"} = \$obj; |
379
|
|
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|
|
|
|
# Now install in $target:: |
380
|
|
|
|
|
|
|
import Object::Import \${"$target\::$name"}, |
381
|
|
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|
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|
|
deref => 1, |
382
|
|
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|
|
|
|
target => $target; |
383
|
|
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|
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|
|
} |
384
|
|
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|
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|
|
} |
385
|
|
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|
|
386
|
|
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|
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|
|
You can use the module C<< My::Object::DSL >> as follows: |
387
|
|
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|
|
|
|
|
388
|
|
|
|
|
|
|
use My::Object::DSL '$obj'; |
389
|
|
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|
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|
|
|
390
|
|
|
|
|
|
|
If you want to pass more options, you can use |
391
|
|
|
|
|
|
|
|
392
|
|
|
|
|
|
|
use My::Object::DSL name => '$obj', foo => 'bar'; |
393
|
|
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|
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|
|
394
|
|
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|
|
|
|
Implementing a small C<::DSL> module instead of using |
395
|
|
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|
|
|
|
C directly has the advantage that you can add defaults |
396
|
|
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|
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|
|
in C. |
397
|
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|
398
|
|
|
|
|
|
|
=head1 SEE ALSO |
399
|
|
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|
|
|
|
|
400
|
|
|
|
|
|
|
L, L, L, L |
401
|
|
|
|
|
|
|
|
402
|
|
|
|
|
|
|
=head1 BUGS |
403
|
|
|
|
|
|
|
|
404
|
|
|
|
|
|
|
Please report bugs using the CPAN bug tracker (under the distribution |
405
|
|
|
|
|
|
|
name Object-Import), or, failing that, to C. |
406
|
|
|
|
|
|
|
|
407
|
|
|
|
|
|
|
=head1 CREDITS |
408
|
|
|
|
|
|
|
|
409
|
|
|
|
|
|
|
The primary author and maintainer of this module is Zsban Ambrus |
410
|
|
|
|
|
|
|
C. Some of the code was written by Max Maischein, who |
411
|
|
|
|
|
|
|
also gave the motivation to turn a prototype to the full module you see. |
412
|
|
|
|
|
|
|
Thanks to exussum0 for the original inspiration. |
413
|
|
|
|
|
|
|
|
414
|
|
|
|
|
|
|
The module is maintained by Max Maischein since 2018. |
415
|
|
|
|
|
|
|
|
416
|
|
|
|
|
|
|
=head1 COPYING |
417
|
|
|
|
|
|
|
|
418
|
|
|
|
|
|
|
Copyright (C) Zsban Ambrus 2010 |
419
|
|
|
|
|
|
|
|
420
|
|
|
|
|
|
|
This program is free software: you can redistribute it and/or modify |
421
|
|
|
|
|
|
|
it under the terms of either the GNU General Public License version 3, |
422
|
|
|
|
|
|
|
as published by the Free Software Foundation; or the "Artistic License" |
423
|
|
|
|
|
|
|
which comes with perl. |
424
|
|
|
|
|
|
|
|
425
|
|
|
|
|
|
|
This program is distributed in the hope that it will be useful, |
426
|
|
|
|
|
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of |
427
|
|
|
|
|
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
428
|
|
|
|
|
|
|
GNU General Public License for more details. |
429
|
|
|
|
|
|
|
|
430
|
|
|
|
|
|
|
A copy of the GNU General Public License can be found in the |
431
|
|
|
|
|
|
|
source tree of this module under the name "GPL", or else see |
432
|
|
|
|
|
|
|
"http://www.gnu.org/licenses/". A copy of the Artistic License can |
433
|
|
|
|
|
|
|
be found in the source tree under the name "ARTISTIC", or else see |
434
|
|
|
|
|
|
|
"http://search.cpan.org/~rjbs/perl-5.16.1/pod/perlartistic.pod". |
435
|
|
|
|
|
|
|
|
436
|
|
|
|
|
|
|
=cut |
437
|
|
|
|
|
|
|
|
438
|
|
|
|
|
|
|
|
439
|
14
|
|
|
14
|
|
103
|
use strict; |
|
14
|
|
|
|
|
36
|
|
|
14
|
|
|
|
|
321
|
|
440
|
14
|
|
|
14
|
|
322
|
use 5.007; |
|
14
|
|
|
|
|
61
|
|
441
|
14
|
|
|
14
|
|
88
|
use Scalar::Util qw"blessed reftype"; |
|
14
|
|
|
|
|
33
|
|
|
14
|
|
|
|
|
7936
|
|
442
|
14
|
|
|
14
|
|
5882
|
eval " |
|
14
|
|
|
|
|
19219
|
|
|
14
|
|
|
|
|
319
|
|
443
|
|
|
|
|
|
|
use MRO::Compat; |
444
|
|
|
|
|
|
|
"; |
445
|
|
|
|
|
|
|
if (my $use_mro_compat_error = $@) { |
446
|
|
|
|
|
|
|
eval " |
447
|
|
|
|
|
|
|
use mro; |
448
|
|
|
|
|
|
|
"; |
449
|
|
|
|
|
|
|
my $use_mro_error = $@; |
450
|
|
|
|
|
|
|
$use_mro_error and |
451
|
|
|
|
|
|
|
die "$use_mro_compat_error\n$use_mro_error\nerror: could not use either of modules MRO::Compat or mro"; |
452
|
|
|
|
|
|
|
} |
453
|
|
|
|
|
|
|
|
454
|
|
|
|
|
|
|
|
455
|
|
|
|
|
|
|
# Methods must not be exported automatically if their original name is in %special_source |
456
|
|
|
|
|
|
|
# or if the name of the exported sub is in %special_target. |
457
|
|
|
|
|
|
|
our %special_source; |
458
|
|
|
|
|
|
|
our %special_target; |
459
|
|
|
|
|
|
|
|
460
|
|
|
|
|
|
|
# Any name starting with a character other than a letter or underscore are forced to |
461
|
|
|
|
|
|
|
# package main. Such names in other packages may only be accessed with an explicit |
462
|
|
|
|
|
|
|
# package name. Most of these are special or reserved to be special by the core, though |
463
|
|
|
|
|
|
|
# none of their function slots are used. We do not export these because the user could |
464
|
|
|
|
|
|
|
# not call them easily unless exported to main. Note that names starting with unicode |
465
|
|
|
|
|
|
|
# non-letter characters or names that start with invalid utf-8 also seem to be forced |
466
|
|
|
|
|
|
|
# to main (these may only be accessed through symbolic references). |
467
|
|
|
|
|
|
|
# The following names are also forced to main like above. |
468
|
|
|
|
|
|
|
$special_source{$_}++, $special_target{$_}++ for |
469
|
|
|
|
|
|
|
qw"ENV INC ARGV ARGVOUT SIG STDIN STDOUT STDERR _"; |
470
|
|
|
|
|
|
|
# The following names are called by the core on some occasions. |
471
|
|
|
|
|
|
|
$special_source{$_}++, $special_target{$_}++ for qw" |
472
|
|
|
|
|
|
|
AUTOLOAD BINMODE CLEAR CLEARERR CLONE CLONE_SKIP CLOSE DELETE DESTROY |
473
|
|
|
|
|
|
|
EOF ERROR EXISTS EXTEND FDOPEN FETCH FETCHSIZE FILENO FILL FIRSTKEY |
474
|
|
|
|
|
|
|
FLUSH GETC NEXTKEY OPEN POP POPPED PRINT PRINTF PUSH PUSHED READ READLINE |
475
|
|
|
|
|
|
|
SCALAR SEEK SETLINEBUF SHIFT SPLICE STORE STORESIZE SYSOPEN TELL TIEARRAY |
476
|
|
|
|
|
|
|
TIEHANDLE TIEHASH TIESCALAR UNREAD UNSHIFT UNTIE UTF8 WRITE"; |
477
|
|
|
|
|
|
|
# Names starting with "(" are used by the overload mechanism, even as functions in some |
478
|
|
|
|
|
|
|
# cases. We do not touch such subs. |
479
|
|
|
|
|
|
|
# Names starting with "_<" are used for something related to source files, |
480
|
|
|
|
|
|
|
# but the sub slot is not used, so we don't care. |
481
|
|
|
|
|
|
|
# The following names are called by use/no, so they definitely should not be exported. |
482
|
|
|
|
|
|
|
$special_source{$_}++, $special_target{$_}++ for qw"import unimport"; |
483
|
|
|
|
|
|
|
# The following should not occur as subs, but we exclude them for good measure. |
484
|
|
|
|
|
|
|
$special_source{$_}++, $special_target{$_}++ for |
485
|
|
|
|
|
|
|
qw"BEGIN UNITCHECK CHECK INIT END"; |
486
|
|
|
|
|
|
|
# The following names could override a builtin function if exported to a module |
487
|
|
|
|
|
|
|
$special_target{$_}++ for qw" |
488
|
|
|
|
|
|
|
abs accept alarm atan2 bind binmode bless break caller chdir chmod |
489
|
|
|
|
|
|
|
chomp chop chown chr chroot close closedir connect continue cos |
490
|
|
|
|
|
|
|
crypt dbmclose dbmopen default defined delete die do dump each |
491
|
|
|
|
|
|
|
else elsif endgrent endhostent endnetent endprotoent endpwent |
492
|
|
|
|
|
|
|
endservent eof eval exec exists exit exp fcntl fileno flock for |
493
|
|
|
|
|
|
|
foreach fork format formline getc getgrent getgrgid getgrnam |
494
|
|
|
|
|
|
|
gethostbyaddr gethostbyname gethostent getlogin getnetbyaddr |
495
|
|
|
|
|
|
|
getnetbyname getnetent getpeername getpgrp getppid getpriority |
496
|
|
|
|
|
|
|
getprotobyname getprotobynumber getprotoent getpwent getpwnam |
497
|
|
|
|
|
|
|
getpwuid getservbyname getservbyport getservent getsockname |
498
|
|
|
|
|
|
|
getsockopt given glob gmtime goto grep hex if index int |
499
|
|
|
|
|
|
|
ioctl join keys kill last lc lcfirst length link listen local |
500
|
|
|
|
|
|
|
localtime lock log lstat map mkdir msgctl msgget msgrcv msgsnd |
501
|
|
|
|
|
|
|
my next no not oct open opendir ord our pack package pipe pop |
502
|
|
|
|
|
|
|
pos print printf prototype push quotemeta rand read readdir |
503
|
|
|
|
|
|
|
readline readlink readpipe recv redo ref rename require reset |
504
|
|
|
|
|
|
|
return reverse rewinddir rindex rmdir say scalar seek seekdir |
505
|
|
|
|
|
|
|
select semctl semget semop send setgrent sethostent setnetent |
506
|
|
|
|
|
|
|
setpgrp setpriority setprotoent setpwent setservent setsockopt |
507
|
|
|
|
|
|
|
shift shmctl shmget shmread shmwrite shutdown sin sleep socket |
508
|
|
|
|
|
|
|
socketpair sort splice split sprintf sqrt srand stat state |
509
|
|
|
|
|
|
|
study sub substr symlink syscall sysopen sysread sysseek system |
510
|
|
|
|
|
|
|
syswrite tell telldir tie tied time times truncate uc ucfirst |
511
|
|
|
|
|
|
|
umask undef unless unlink unpack unshift untie until use utime |
512
|
|
|
|
|
|
|
values vec wait waitpid wantarray warn when while write |
513
|
|
|
|
|
|
|
fc evalbytes __SUB__ __FILE__ __LINE__ __PACKAGE__ |
514
|
|
|
|
|
|
|
"; |
515
|
|
|
|
|
|
|
# The following four are UNIVERSAL functions. |
516
|
|
|
|
|
|
|
$special_source{$_}++, $special_target{$_}++ for qw"can isa DOES VERSION"; |
517
|
|
|
|
|
|
|
# The following keywords cannot be overriden this way, so are safe to export, |
518
|
|
|
|
|
|
|
# though you may have to use tricky syntax to call some of them: |
519
|
|
|
|
|
|
|
0 for qw "and cmp eq ge gt le lt m ne or q qq qr qw qx s tr x xor y"; |
520
|
|
|
|
|
|
|
# The old aliases LT etc are removed from core at perl 5.8 and do not count |
521
|
|
|
|
|
|
|
# as special anymore. |
522
|
|
|
|
|
|
|
# Some of the above long list might also not be overridable, eg. "if". |
523
|
|
|
|
|
|
|
# The following are special, but are not functions and not forced to main. |
524
|
|
|
|
|
|
|
0 for qw"a b DATA OVERLOAD"; |
525
|
|
|
|
|
|
|
# The following names are English aliases for special variables so they could |
526
|
|
|
|
|
|
|
# be aliased to special names, eg. if the module imports English |
527
|
|
|
|
|
|
|
# then &ARG and &::_ are the same. The function slot of none of these is special. |
528
|
|
|
|
|
|
|
# Exporting to such names would be a bad idea because they could overwrite |
529
|
|
|
|
|
|
|
# a function in main. |
530
|
|
|
|
|
|
|
$special_source{$_}++, $special_target{$_}++ for qw" |
531
|
|
|
|
|
|
|
ACCUMULATOR ARG ARRAY_BASE BASETIME CHILD_ERROR COMPILING DEBUGGING |
532
|
|
|
|
|
|
|
EFFECTIVE_GROUP_ID EFFECTIVE_USER_ID EGID ERRNO EUID EVAL_ERROR |
533
|
|
|
|
|
|
|
EXCEPTIONS_BEING_CAUGHT EXECUTABLE_NAME EXTENDED_OS_ERROR FORMAT_FORMFEED |
534
|
|
|
|
|
|
|
FORMAT_LINES_LEFT FORMAT_LINES_PER_PAGE FORMAT_LINE_BREAK_CHARACTERS |
535
|
|
|
|
|
|
|
FORMAT_NAME FORMAT_PAGE_NUMBER FORMAT_TOP_NAME GID INPLACE_EDIT |
536
|
|
|
|
|
|
|
INPUT_LINE_NUMBER INPUT_RECORD_SEPARATOR LAST_MATCH_END LAST_MATCH_START |
537
|
|
|
|
|
|
|
LAST_PAREN_MATCH LAST_REGEXP_CODE_RESULT LAST_SUBMATCH_RESULT |
538
|
|
|
|
|
|
|
LIST_SEPARATOR MATCH NR OFMT OFS OLD_PERL_VERSION ORS OSNAME OS_ERROR |
539
|
|
|
|
|
|
|
OUTPUT_AUTOFLUSH OUTPUT_FIELD_SEPARATOR OUTPUT_RECORD_SEPARATOR PERLDB |
540
|
|
|
|
|
|
|
PERL_VERSION PID POSTMATCH PREMATCH PROCESS_ID PROGRAM_NAME REAL_GROUP_ID |
541
|
|
|
|
|
|
|
REAL_USER_ID RS SUBSCRIPT_SEPARATOR SUBSEP SYSTEM_FD_MAX UID WARNING"; |
542
|
|
|
|
|
|
|
# The following are names used by Exporter, but not as functions. |
543
|
|
|
|
|
|
|
0 for qw"EXPORT EXPORT_OK EXPORT_FAIL EXPORT_TAGS"; |
544
|
|
|
|
|
|
|
# The following are subs used by Exporter, some internal. |
545
|
|
|
|
|
|
|
$special_source{$_}++, $special_target{$_}++ for qw" |
546
|
|
|
|
|
|
|
_push_tags _rebuild_cache as_heavy export export_fail export_fail_in |
547
|
|
|
|
|
|
|
export_ok_tags export_tags export_to_level heavy_export |
548
|
|
|
|
|
|
|
heavy_export_ok_tags heavy_export_tags heavy_export_to_level |
549
|
|
|
|
|
|
|
heavy_require_version require_version"; |
550
|
|
|
|
|
|
|
# (Ideally we should have a mechanism to exclude everything that's defined in Exporter |
551
|
|
|
|
|
|
|
# or Exporter::Heavy) |
552
|
|
|
|
|
|
|
# The following are depreciated aliases to the standard filehandles, but as these aren't |
553
|
|
|
|
|
|
|
# forced to main we shan't exclude them. |
554
|
|
|
|
|
|
|
0 for qw"stdin stdout stderr"; |
555
|
|
|
|
|
|
|
# Yeah, these lists got out of hand, but I want a place to collect all special names. |
556
|
|
|
|
|
|
|
# TODO: See also the B::Keywords module, and submit patches for it. |
557
|
|
|
|
|
|
|
# If the user gives an list of names, we assume they know what they are doing. |
558
|
|
|
|
|
|
|
|
559
|
|
|
|
|
|
|
sub special_source { |
560
|
1421
|
|
|
1421
|
0
|
2456
|
my($n) = @_; |
561
|
1421
|
|
|
|
|
2969
|
utf8::decode($n); |
562
|
14
|
100
|
|
14
|
|
8114
|
exists($special_source{$n}) || $n !~ /\A[_\pL]/; |
|
14
|
|
|
|
|
212
|
|
|
14
|
|
|
|
|
211
|
|
|
1421
|
|
|
|
|
8273
|
|
563
|
|
|
|
|
|
|
} |
564
|
|
|
|
|
|
|
sub special_target { |
565
|
952
|
|
|
952
|
0
|
1580
|
my($n) = @_; |
566
|
952
|
|
|
|
|
2107
|
utf8::decode($n); |
567
|
952
|
100
|
|
|
|
4377
|
exists($special_target{$n}) || $n !~ /\A[_\pL]/; |
568
|
|
|
|
|
|
|
} |
569
|
|
|
|
|
|
|
|
570
|
|
|
|
|
|
|
|
571
|
|
|
|
|
|
|
# this returns a list to the methods we want to export automatically |
572
|
|
|
|
|
|
|
sub list_method { |
573
|
37
|
|
|
37
|
0
|
104
|
my($obj, $expkg, $debug, $nowarn_nomethod, $underscore, $exclude) = @_; |
574
|
37
|
|
|
|
|
62
|
my $oobj = $obj; |
575
|
37
|
100
|
|
|
|
52
|
my %exclude; if ($exclude) { %exclude = %$exclude; } |
|
37
|
|
|
|
|
99
|
|
|
2
|
|
|
|
|
5
|
|
576
|
|
|
|
|
|
|
my $complain = sub { |
577
|
4
|
|
|
4
|
|
10
|
my($k) = @_; |
578
|
4
|
50
|
|
|
|
8
|
$nowarn_nomethod and return; |
579
|
14
|
|
|
14
|
|
293176
|
no warnings "uninitialized"; |
|
14
|
|
|
|
|
32
|
|
|
14
|
|
|
|
|
2572
|
|
580
|
4
|
|
|
|
|
46
|
warn "warning: Object::Import cannot find methods of " . $k . ": " . $oobj; |
581
|
37
|
|
|
|
|
184
|
}; |
582
|
37
|
100
|
100
|
|
|
275
|
if (reftype($obj) ? !defined(blessed($obj)) && "GLOB" eq reftype($obj) : "GLOB" eq reftype(\$obj)) { |
|
|
100
|
|
|
|
|
|
583
|
4
|
|
|
|
|
10
|
$obj = *$obj{IO}; # this magically converts any filehandle (glob, ref-to-glob, symref, true handle object) to a handle object. we need this to find the methods. |
584
|
|
|
|
|
|
|
# note that we don't enter here if we have a blessed globref: magical overloaded objects such as File::Temp or Coro::Handle objs can take care of themselves, and we'd lose methods if we dereferenced them to their underlying handles. |
585
|
4
|
50
|
|
|
|
10
|
if (!defined($obj)) { |
586
|
0
|
|
|
|
|
0
|
&$complain("globref with no IO handle"); |
587
|
0
|
|
|
|
|
0
|
return; |
588
|
|
|
|
|
|
|
} |
589
|
|
|
|
|
|
|
} |
590
|
37
|
|
|
|
|
70
|
eval { $obj->can("import") }; |
|
37
|
|
|
|
|
239
|
|
591
|
37
|
|
|
|
|
85
|
my $can_methods = !$@; # false if $obj is an unblessed ref or a string that does not look like a package name, so perl refuses to call any methods |
592
|
37
|
100
|
|
|
|
94
|
if (!$can_methods) { |
593
|
2
|
50
|
|
|
|
17
|
&$complain( |
|
|
0
|
|
|
|
|
|
|
|
50
|
|
|
|
|
|
|
|
50
|
|
|
|
|
|
|
|
100
|
|
|
|
|
|
594
|
|
|
|
|
|
|
reftype($obj) ? (defined(blessed($obj)) ? "strange object" : "unblessed reference") : |
595
|
|
|
|
|
|
|
!defined($obj) ? "undefined value" : |
596
|
|
|
|
|
|
|
!length($obj) ? "empty string value" : |
597
|
|
|
|
|
|
|
!$obj ? "false value" : |
598
|
|
|
|
|
|
|
"string value that is an invalid package name"); |
599
|
2
|
|
|
|
|
33
|
return; |
600
|
|
|
|
|
|
|
} |
601
|
14
|
100
|
100
|
14
|
|
96
|
if (!reftype($obj) && do { no strict "refs"; !%{$obj . "::"} }) { |
|
14
|
|
|
|
|
28
|
|
|
14
|
|
|
|
|
1565
|
|
|
35
|
|
|
|
|
122
|
|
|
14
|
|
|
|
|
25
|
|
|
14
|
|
|
|
|
77
|
|
602
|
2
|
|
|
|
|
6
|
&$complain("nonexistent package"); |
603
|
|
|
|
|
|
|
} |
604
|
35
|
|
|
|
|
81
|
my %r; |
605
|
35
|
|
66
|
|
|
133
|
my $class = blessed($obj) || $obj; |
606
|
35
|
|
|
|
|
64
|
my @class = @{mro::get_linear_isa($class)}; |
|
35
|
|
|
|
|
168
|
|
607
|
35
|
50
|
|
|
|
93
|
$debug and warn "debug: Object::Import object $oobj, class $class, search path: @class"; |
608
|
35
|
|
|
|
|
76
|
for my $pkgn (@class) { |
609
|
14
|
|
|
14
|
|
88
|
my $pkg = do { no strict "refs"; \%{$pkgn . "::"}}; |
|
14
|
|
|
|
|
28
|
|
|
14
|
|
|
|
|
4713
|
|
|
62
|
|
|
|
|
96
|
|
|
62
|
|
|
|
|
82
|
|
|
62
|
|
|
|
|
164
|
|
610
|
62
|
|
|
|
|
1064
|
for my $m (sort keys %$pkg) { |
611
|
2064
|
100
|
100
|
|
|
9674
|
if ( |
|
|
|
100
|
|
|
|
|
|
|
|
100
|
|
|
|
|
|
|
|
100
|
|
|
|
|
|
|
|
100
|
|
|
|
|
612
|
|
|
|
|
|
|
!$exclude{$m} && |
613
|
|
|
|
|
|
|
!$r{$m} && |
614
|
|
|
|
|
|
|
$obj->can($m) && # was exists(&{$$pkg{$m}}) |
615
|
|
|
|
|
|
|
!special_source($m) && |
616
|
|
|
|
|
|
|
($underscore || $m !~ /\A_/) |
617
|
|
|
|
|
|
|
) { |
618
|
954
|
|
|
|
|
2182
|
$r{$m}++; |
619
|
|
|
|
|
|
|
} |
620
|
|
|
|
|
|
|
} |
621
|
|
|
|
|
|
|
} |
622
|
35
|
|
|
|
|
448
|
keys(%r); |
623
|
|
|
|
|
|
|
} |
624
|
|
|
|
|
|
|
|
625
|
|
|
|
|
|
|
|
626
|
|
|
|
|
|
|
sub dor ($$) { |
627
|
153
|
|
|
153
|
0
|
268
|
my($x, $y) = @_; |
628
|
153
|
100
|
|
|
|
415
|
defined($x) ? $x : $y; |
629
|
|
|
|
|
|
|
} |
630
|
|
|
|
|
|
|
|
631
|
|
|
|
|
|
|
sub import { |
632
|
54
|
|
|
54
|
|
87938
|
my($_u, $arg1, @opt) = @_; |
633
|
54
|
100
|
|
|
|
205
|
if (@_ <= 1) { |
634
|
3
|
|
|
|
|
164
|
return; # required for later imports |
635
|
|
|
|
|
|
|
} |
636
|
51
|
50
|
|
|
|
176
|
0 == @opt % 2 or |
637
|
|
|
|
|
|
|
die q"error: odd number of import options to Object::Import; usage: use Object::Import $obj, %opts"; |
638
|
51
|
|
|
|
|
172
|
my %opt = @opt; |
639
|
|
|
|
|
|
|
my($deref, $methl, $debug, $nowarn_redefine, $nowarn_nomethod, $underscore, $exclude_method, $exclude_import, $savename, $funprefix, $funsuffix, $expkgn) = |
640
|
51
|
|
|
|
|
338
|
delete(@opt{(qw"deref list debug nowarn_redefine nowarn_nomethod underscore exclude_methods exclude_imports savenames prefix suffix target")}); |
641
|
51
|
50
|
|
|
|
165
|
%opt and |
642
|
|
|
|
|
|
|
die "error: unused import options to Object::Import: " . join(" ", keys(%opt)); |
643
|
51
|
|
|
|
|
173
|
$expkgn = dor($expkgn, scalar caller); |
644
|
51
|
100
|
|
|
|
139
|
my $objr = $deref ? $arg1 : \$arg1; |
645
|
51
|
|
|
|
|
157
|
$_ = dor($_, "") for $funprefix, $funsuffix; # one could use the suffix "0" afterall |
646
|
51
|
100
|
|
|
|
80
|
my %exclude_import; $exclude_import and %exclude_import = %$exclude_import; |
|
51
|
|
|
|
|
172
|
|
647
|
51
|
|
|
|
|
117
|
my $expkgns = $expkgn . "::"; |
648
|
14
|
|
|
14
|
|
108
|
my $expkg = do {no strict 'refs'; \%{$expkgns} }; |
|
14
|
|
|
|
|
29
|
|
|
14
|
|
|
|
|
940
|
|
|
51
|
|
|
|
|
74
|
|
|
51
|
|
|
|
|
64
|
|
|
51
|
|
|
|
|
154
|
|
649
|
51
|
50
|
|
|
|
128
|
if ($debug) { warn "debug: Object::Import starting to export methods to package $expkgns"; } |
|
0
|
|
|
|
|
0
|
|
650
|
51
|
|
|
|
|
81
|
my @meth; |
651
|
51
|
100
|
|
|
|
111
|
if ($methl) { |
652
|
14
|
|
|
|
|
30
|
@meth = @$methl; |
653
|
|
|
|
|
|
|
} else { |
654
|
14
|
|
|
14
|
|
83
|
@meth = list_method do { no strict "refs"; $$objr }, $expkg, $debug, $nowarn_nomethod, $underscore, $exclude_method; |
|
14
|
|
|
|
|
26
|
|
|
14
|
|
|
|
|
1171
|
|
|
37
|
|
|
|
|
57
|
|
|
37
|
|
|
|
|
114
|
|
655
|
|
|
|
|
|
|
} |
656
|
51
|
|
|
|
|
98
|
my @funn; |
657
|
51
|
|
|
|
|
95
|
for my $methn (@meth) { |
658
|
973
|
|
|
|
|
1758
|
my $funn = $funprefix . $methn . $funsuffix; |
659
|
973
|
100
|
100
|
|
|
2693
|
if (!$exclude_import{$funn} && |
|
|
|
100
|
|
|
|
|
660
|
|
|
|
|
|
|
($methl || |
661
|
|
|
|
|
|
|
(!special_target($funn) && |
662
|
|
|
|
|
|
|
!exists(&{$expkgns . $funn}))) # was (!$$expkg{$funn} || !exists(&{$$expkg{$funn}})) |
663
|
|
|
|
|
|
|
# that's wrong because of some shortcut symbol table entries for constants or predeclared subs |
664
|
|
|
|
|
|
|
) { |
665
|
14
|
|
|
14
|
|
84
|
my $p = sub (@) { no strict "refs"; $$objr->${\$methn}(@_) }; |
|
14
|
|
|
99
|
|
26
|
|
|
14
|
|
|
|
|
668
|
|
|
967
|
|
|
|
|
3706
|
|
|
99
|
|
|
|
|
83164
|
|
|
99
|
|
|
|
|
618
|
|
666
|
|
|
|
|
|
|
{ |
667
|
14
|
|
|
14
|
|
74
|
no strict 'refs'; |
|
14
|
|
|
|
|
28
|
|
|
14
|
|
|
|
|
378
|
|
|
967
|
|
|
|
|
1514
|
|
668
|
967
|
100
|
|
|
|
1443
|
if ($nowarn_redefine) { |
669
|
14
|
|
|
14
|
|
78
|
no warnings "redefine"; |
|
14
|
|
|
|
|
33
|
|
|
14
|
|
|
|
|
2951
|
|
670
|
2
|
|
|
|
|
4
|
*{$expkgns . $funn} = $p; |
|
2
|
|
|
|
|
21
|
|
671
|
|
|
|
|
|
|
} else { |
672
|
965
|
|
|
|
|
1151
|
*{$expkgns . $funn} = $p; |
|
965
|
|
|
|
|
3925
|
|
673
|
|
|
|
|
|
|
} |
674
|
|
|
|
|
|
|
} |
675
|
967
|
|
|
|
|
2346
|
push @funn, $funn; |
676
|
|
|
|
|
|
|
} |
677
|
|
|
|
|
|
|
} |
678
|
51
|
50
|
|
|
|
128
|
if ($debug) { warn "debug: Object::Import exported the following functions: ", join(" ", sort(@funn)); } |
|
0
|
|
|
|
|
0
|
|
679
|
51
|
100
|
|
|
|
6299
|
if ($savename) { |
680
|
13
|
|
|
|
|
145
|
$$savename{$_}++ for @funn; |
681
|
|
|
|
|
|
|
} |
682
|
|
|
|
|
|
|
} |
683
|
|
|
|
|
|
|
|
684
|
|
|
|
|
|
|
|
685
|
|
|
|
|
|
|
1; |
686
|
|
|
|
|
|
|
__END__ |