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1 | NAME |
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2 | namespace::clean - Keep imports and functions out of your namespace |
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3 | |
4 | VERSION |
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5 | 0.06 |
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6 | |
7 | SYNOPSIS |
8 | package Foo; |
9 | use warnings; |
10 | use strict; |
11 | |
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12 | use Carp qw(croak); # 'croak' will be removed |
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13 | |
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14 | sub bar { 23 } # 'bar' will be removed |
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15 | |
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16 | # remove all previously defined functions |
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17 | use namespace::clean; |
18 | |
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19 | sub baz { bar() } # 'baz' still defined, 'bar' still bound |
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20 | |
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21 | # begin to collection function names from here again |
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22 | no namespace::clean; |
23 | |
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24 | sub quux { baz() } # 'quux' will be removed |
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25 | |
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26 | # remove all functions defined after the 'no' unimport |
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27 | use namespace::clean; |
28 | |
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29 | # Will print: 'No', 'No', 'Yes' and 'No' |
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30 | print +(__PACKAGE__->can('croak') ? 'Yes' : 'No'), "\n"; |
31 | print +(__PACKAGE__->can('bar') ? 'Yes' : 'No'), "\n"; |
32 | print +(__PACKAGE__->can('baz') ? 'Yes' : 'No'), "\n"; |
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33 | print +(__PACKAGE__->can('quux') ? 'Yes' : 'No'), "\n"; |
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34 | |
35 | 1; |
36 | |
37 | DESCRIPTION |
38 | When you define a function, or import one, into a Perl package, it will |
39 | naturally also be available as a method. This does not per se cause |
40 | problems, but it can complicate subclassing and, for example, plugin |
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41 | classes that are included via multiple inheritance by loading them as |
42 | base classes. |
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43 | |
44 | The "namespace::clean" pragma will remove all previously declared or |
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45 | imported symbols at the end of the current package's compile cycle. |
46 | Functions called in the package itself will still be bound by their |
47 | name, but they won't show up as methods on your class or instances. |
48 | |
49 | By unimporting via "no" you can tell "namespace::clean" to start |
50 | collecting functions for the next "use namespace::clean;" specification. |
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51 | |
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52 | You can use the "-except" flag to tell "namespace::clean" that you don't |
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53 | want it to remove a certain function or method. A common use would be a |
54 | module exporting an "import" method along with some functions: |
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55 | |
56 | use ModuleExportingImport; |
57 | use namespace::clean -except => [qw( import )]; |
58 | |
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59 | If you just want to "-except" a single sub, you can pass it directly. |
60 | For more than one value you have to use an array reference. |
61 | |
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62 | METHODS |
63 | You shouldn't need to call any of these. Just "use" the package at the |
64 | appropriate place. |
65 | |
66 | import |
67 | Makes a snapshot of the current defined functions and registers a |
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68 | Filter::EOF cleanup routine to remove those symbols at the end of the |
69 | compile-time. |
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70 | |
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71 | unimport |
72 | This method will be called when you do a |
73 | |
74 | no namespace::clean; |
75 | |
76 | It will start a new section of code that defines functions to clean up. |
77 | |
78 | get_class_store |
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79 | This returns a reference to a hash in a passed package containing |
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80 | information about function names included and excluded from removal. |
81 | |
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82 | get_functions |
83 | Takes a class as argument and returns all currently defined functions in |
84 | it as a hash reference with the function name as key and a typeglob |
85 | reference to the symbol as value. |
86 | |
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87 | IMPLEMENTATION DETAILS |
88 | This module works through the effect that a |
89 | |
90 | delete $SomePackage::{foo}; |
91 | |
92 | will remove the "foo" symbol from $SomePackage for run time lookups |
93 | (e.g., method calls) but will leave the entry alive to be called by |
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94 | already resolved names in the package itself. "namespace::clean" will |
95 | restore and therefor in effect keep all glob slots that aren't "CODE". |
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96 | |
97 | A test file has been added to the perl core to ensure that this |
98 | behaviour will be stable in future releases. |
99 | |
100 | Just for completeness sake, if you want to remove the symbol completely, |
101 | use "undef" instead. |
102 | |
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103 | SEE ALSO |
104 | Filter::EOF |
105 | |
106 | AUTHOR AND COPYRIGHT |
107 | Robert 'phaylon' Sedlacek "<rs@474.at>", with many thanks to Matt S |
108 | Trout for the inspiration on the whole idea. |
109 | |
110 | LICENSE |
111 | This program is free software; you can redistribute it and/or modify it |
112 | under the same terms as perl itself. |
113 | |