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1 | #!/usr/bin/env perl |
2 | package Mouse::Util; |
3 | use strict; |
4 | use warnings; |
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5 | use Exporter 'import'; |
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6 | use Carp; |
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7 | |
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8 | our @EXPORT_OK = qw( |
9 | blessed |
10 | get_linear_isa |
11 | looks_like_number |
12 | openhandle |
13 | reftype |
14 | weaken |
15 | ); |
16 | our %EXPORT_TAGS = ( |
17 | all => \@EXPORT_OK, |
18 | ); |
19 | |
20 | # We only have to do this nastiness if we haven't loaded XS version of |
21 | # Mouse.pm, so check if we're running under PurePerl or not |
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22 | BEGIN { |
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23 | if ($Mouse::PurePerl) { |
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24 | my %dependencies = ( |
25 | 'Scalar::Util' => { |
26 | # VVVVV CODE TAKEN FROM SCALAR::UTIL VVVVV |
27 | 'blessed' => do { |
28 | *UNIVERSAL::a_sub_not_likely_to_be_here = sub { |
29 | my $ref = ref($_[0]); |
30 | |
31 | # deviation from Scalar::Util |
32 | # XS returns undef, PP returns GLOB. |
33 | # let's make that more consistent by having PP return |
34 | # undef if it's a GLOB. :/ |
35 | |
36 | # \*STDOUT would be allowed as an object in PP blessed |
37 | # but not XS |
38 | return $ref eq 'GLOB' ? undef : $ref; |
39 | }; |
40 | |
41 | sub { |
42 | local($@, $SIG{__DIE__}, $SIG{__WARN__}); |
43 | length(ref($_[0])) |
44 | ? eval { $_[0]->a_sub_not_likely_to_be_here } |
45 | : undef; |
46 | }, |
47 | }, |
48 | 'looks_like_number' => sub { |
49 | local $_ = shift; |
50 | |
51 | # checks from perlfaq4 |
52 | return 0 if !defined($_) or ref($_); |
53 | return 1 if (/^[+-]?\d+$/); # is a +/- integer |
54 | return 1 if (/^([+-]?)(?=\d|\.\d)\d*(\.\d*)?([Ee]([+-]?\d+))?$/); # a C float |
55 | return 1 if ($] >= 5.008 and /^(Inf(inity)?|NaN)$/i) or ($] >= 5.006001 and /^Inf$/i); |
56 | |
57 | 0; |
58 | }, |
59 | 'reftype' => sub { |
60 | local($@, $SIG{__DIE__}, $SIG{__WARN__}); |
61 | my $r = shift; |
62 | my $t; |
63 | |
64 | length($t = ref($r)) or return undef; |
65 | |
66 | # This eval will fail if the reference is not blessed |
67 | eval { $r->a_sub_not_likely_to_be_here; 1 } |
68 | ? do { |
69 | $t = eval { |
70 | # we have a GLOB or an IO. Stringify a GLOB gives it's name |
71 | my $q = *$r; |
72 | $q =~ /^\*/ ? "GLOB" : "IO"; |
73 | } |
74 | or do { |
75 | # OK, if we don't have a GLOB what parts of |
76 | # a glob will it populate. |
77 | # NOTE: A glob always has a SCALAR |
78 | local *glob = $r; |
79 | defined *glob{ARRAY} && "ARRAY" |
80 | or defined *glob{HASH} && "HASH" |
81 | or defined *glob{CODE} && "CODE" |
82 | or length(ref(${$r})) ? "REF" : "SCALAR"; |
83 | } |
84 | } |
85 | : $t |
86 | }, |
87 | 'openhandle' => sub { |
88 | my $fh = shift; |
89 | my $rt = reftype($fh) || ''; |
90 | |
91 | return defined(fileno($fh)) ? $fh : undef |
92 | if $rt eq 'IO'; |
93 | |
94 | if (reftype(\$fh) eq 'GLOB') { # handle openhandle(*DATA) |
95 | $fh = \(my $tmp=$fh); |
96 | } |
97 | elsif ($rt ne 'GLOB') { |
98 | return undef; |
99 | } |
100 | |
101 | (tied(*$fh) or defined(fileno($fh))) |
102 | ? $fh : undef; |
103 | }, |
104 | weaken => { |
105 | loaded => \&Scalar::Util::weaken, |
106 | not_loaded => sub { die "Scalar::Util required for weak reference support" }, |
107 | }, |
108 | # ^^^^^ CODE TAKEN FROM SCALAR::UTIL ^^^^^ |
109 | }, |
110 | 'MRO::Compat' => { |
111 | # VVVVV CODE TAKEN FROM MRO::COMPAT VVVVV |
112 | 'get_linear_isa' => { |
113 | loaded => \&mro::get_linear_isa, |
114 | not_loaded => do { |
115 | # this recurses so it isn't pretty |
116 | my $code; |
117 | $code = sub { |
118 | no strict 'refs'; |
119 | |
120 | my $classname = shift; |
121 | |
122 | my @lin = ($classname); |
123 | my %stored; |
124 | foreach my $parent (@{"$classname\::ISA"}) { |
125 | my $plin = $code->($parent); |
126 | foreach (@$plin) { |
127 | next if exists $stored{$_}; |
128 | push(@lin, $_); |
129 | $stored{$_} = 1; |
130 | } |
131 | } |
132 | return \@lin; |
133 | } |
134 | }, |
135 | }, |
136 | # ^^^^^ CODE TAKEN FROM MRO::COMPAT ^^^^^ |
137 | }, |
138 | ); |
139 | |
140 | my %loaded; |
141 | for my $module_name (keys %dependencies) { |
142 | my $loaded = do { |
143 | local $SIG{__DIE__} = 'DEFAULT'; |
144 | eval "require $module_name; 1"; |
145 | }; |
146 | |
147 | $loaded{$module_name} = $loaded; |
148 | |
149 | for my $method_name (keys %{ $dependencies{ $module_name } }) { |
150 | my $producer = $dependencies{$module_name}{$method_name}; |
151 | my $implementation; |
152 | |
153 | if (ref($producer) eq 'HASH') { |
154 | $implementation = $loaded |
155 | ? $producer->{loaded} |
156 | : $producer->{not_loaded}; |
157 | } |
158 | else { |
159 | $implementation = $loaded |
160 | ? $module_name->can($method_name) |
161 | : $producer; |
162 | } |
163 | |
164 | no strict 'refs'; |
165 | *{ __PACKAGE__ . '::' . $method_name } = $implementation; |
166 | } |
167 | } |
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168 | } else { |
169 | # If we're running under XS, we can provide |
170 | # blessed |
171 | # looks_like_number |
172 | # reftype |
173 | # weaken |
174 | # other functions need to be loaded from our respective sources |
175 | |
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176 | if (defined &Scalar::Util::openhandle || eval { require Scalar::Util; 1 }) { |
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177 | *openhandle = \&Scalar::Util::openhandle; |
178 | } else { |
179 | # XXX - room for improvement |
180 | *openhandle = sub { |
21313741 |
181 | my $fh = shift; |
182 | my $rt = reftype($fh) || ''; |
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183 | |
21313741 |
184 | return defined(fileno($fh)) ? $fh : undef |
185 | if $rt eq 'IO'; |
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186 | |
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187 | if (reftype(\$fh) eq 'GLOB') { # handle openhandle(*DATA) |
188 | $fh = \(my $tmp=$fh); |
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189 | } |
21313741 |
190 | elsif ($rt ne 'GLOB') { |
191 | return undef; |
192 | } |
193 | |
194 | (tied(*$fh) or defined(fileno($fh))) |
195 | ? $fh : undef; |
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196 | }; |
197 | } |
198 | |
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199 | if (defined &mro::get_linear_isa || eval { require MRO::Compat; 1; }) { |
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200 | *get_linear_isa = \&mro::get_linear_isa; |
201 | } else { |
202 | # this recurses so it isn't pretty |
203 | my $code; |
204 | *get_linear_isa = $code = sub { |
205 | no strict 'refs'; |
206 | |
207 | my $classname = shift; |
208 | |
209 | my @lin = ($classname); |
210 | my %stored; |
211 | foreach my $parent (@{"$classname\::ISA"}) { |
212 | my $plin = $code->($parent); |
213 | foreach (@$plin) { |
214 | next if exists $stored{$_}; |
215 | push(@lin, $_); |
216 | $stored{$_} = 1; |
217 | } |
218 | } |
219 | return \@lin; |
220 | }; |
221 | } |
222 | } |
223 | } |
224 | |
2e92bb89 |
225 | sub apply_all_roles { |
226 | my $meta = Mouse::Meta::Class->initialize(shift); |
227 | my $role = shift; |
228 | confess "Mouse::Util only supports 'apply_all_roles' on individual roles at a time" if @_; |
229 | |
230 | Mouse::load_class($role); |
231 | $role->meta->apply($meta); |
232 | } |
233 | |
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234 | 1; |
235 | |
f38ce2d0 |
236 | __END__ |
237 | |
238 | =head1 NAME |
239 | |
240 | Mouse::Util - features, with or without their dependencies |
241 | |
242 | =head1 IMPLEMENTATIONS FOR |
243 | |
244 | =head2 L<MRO::Compat> |
245 | |
246 | =head3 get_linear_isa |
247 | |
248 | =head2 L<Scalar::Util> |
249 | |
250 | =head3 blessed |
251 | |
252 | =head3 looks_like_number |
253 | |
254 | =head3 reftype |
255 | |
256 | =head3 openhandle |
257 | |
258 | =head3 weaken |
259 | |
260 | C<weaken> I<must> be implemented in XS. If the user tries to use C<weaken> |
261 | without L<Scalar::Util>, an error is thrown. |
262 | |
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263 | =head2 Test::Exception |
264 | |
265 | =head3 throws_ok |
266 | |
267 | =head3 lives_ok |
268 | |
f38ce2d0 |
269 | =cut |
270 | |