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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) { |
24 | _install_pp_func(); |
25 | } else { |
26 | # If we're running under XS, we can provide |
27 | # blessed |
28 | # looks_like_number |
29 | # reftype |
30 | # weaken |
31 | # other functions need to be loaded from our respective sources |
32 | |
21313741 |
33 | if (defined &Scalar::Util::openhandle || eval { require Scalar::Util; 1 }) { |
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34 | *openhandle = \&Scalar::Util::openhandle; |
35 | } else { |
36 | # XXX - room for improvement |
37 | *openhandle = sub { |
21313741 |
38 | my $fh = shift; |
39 | my $rt = reftype($fh) || ''; |
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40 | |
21313741 |
41 | return defined(fileno($fh)) ? $fh : undef |
42 | if $rt eq 'IO'; |
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43 | |
21313741 |
44 | if (reftype(\$fh) eq 'GLOB') { # handle openhandle(*DATA) |
45 | $fh = \(my $tmp=$fh); |
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46 | } |
21313741 |
47 | elsif ($rt ne 'GLOB') { |
48 | return undef; |
49 | } |
50 | |
51 | (tied(*$fh) or defined(fileno($fh))) |
52 | ? $fh : undef; |
eae80759 |
53 | }; |
54 | } |
55 | |
214c3ab9 |
56 | if (defined &mro::get_linear_isa || eval { require MRO::Compat; 1; }) { |
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57 | *get_linear_isa = \&mro::get_linear_isa; |
58 | } else { |
59 | # this recurses so it isn't pretty |
60 | my $code; |
61 | *get_linear_isa = $code = sub { |
62 | no strict 'refs'; |
63 | |
64 | my $classname = shift; |
65 | |
66 | my @lin = ($classname); |
67 | my %stored; |
68 | foreach my $parent (@{"$classname\::ISA"}) { |
69 | my $plin = $code->($parent); |
70 | foreach (@$plin) { |
71 | next if exists $stored{$_}; |
72 | push(@lin, $_); |
73 | $stored{$_} = 1; |
74 | } |
75 | } |
76 | return \@lin; |
77 | }; |
78 | } |
79 | } |
80 | } |
81 | |
82 | sub _install_pp_func { |
83 | my %dependencies = ( |
84 | 'Scalar::Util' => { |
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85 | # VVVVV CODE TAKEN FROM SCALAR::UTIL VVVVV |
42d7df00 |
86 | 'blessed' => do { |
87 | *UNIVERSAL::a_sub_not_likely_to_be_here = sub { |
88 | my $ref = ref($_[0]); |
89 | |
90 | # deviation from Scalar::Util |
91 | # XS returns undef, PP returns GLOB. |
92 | # let's make that more consistent by having PP return |
93 | # undef if it's a GLOB. :/ |
94 | |
95 | # \*STDOUT would be allowed as an object in PP blessed |
96 | # but not XS |
97 | return $ref eq 'GLOB' ? undef : $ref; |
98 | }; |
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99 | |
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100 | sub { |
101 | local($@, $SIG{__DIE__}, $SIG{__WARN__}); |
102 | length(ref($_[0])) |
103 | ? eval { $_[0]->a_sub_not_likely_to_be_here } |
104 | : undef; |
105 | }, |
8fcbe7fb |
106 | }, |
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107 | 'looks_like_number' => sub { |
108 | local $_ = shift; |
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109 | |
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110 | # checks from perlfaq4 |
111 | return 0 if !defined($_) or ref($_); |
112 | return 1 if (/^[+-]?\d+$/); # is a +/- integer |
113 | return 1 if (/^([+-]?)(?=\d|\.\d)\d*(\.\d*)?([Ee]([+-]?\d+))?$/); # a C float |
114 | return 1 if ($] >= 5.008 and /^(Inf(inity)?|NaN)$/i) or ($] >= 5.006001 and /^Inf$/i); |
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115 | |
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116 | 0; |
117 | }, |
118 | 'reftype' => sub { |
119 | local($@, $SIG{__DIE__}, $SIG{__WARN__}); |
120 | my $r = shift; |
121 | my $t; |
122 | |
123 | length($t = ref($r)) or return undef; |
124 | |
125 | # This eval will fail if the reference is not blessed |
126 | eval { $r->a_sub_not_likely_to_be_here; 1 } |
127 | ? do { |
128 | $t = eval { |
129 | # we have a GLOB or an IO. Stringify a GLOB gives it's name |
130 | my $q = *$r; |
131 | $q =~ /^\*/ ? "GLOB" : "IO"; |
132 | } |
133 | or do { |
134 | # OK, if we don't have a GLOB what parts of |
135 | # a glob will it populate. |
136 | # NOTE: A glob always has a SCALAR |
137 | local *glob = $r; |
138 | defined *glob{ARRAY} && "ARRAY" |
139 | or defined *glob{HASH} && "HASH" |
140 | or defined *glob{CODE} && "CODE" |
141 | or length(ref(${$r})) ? "REF" : "SCALAR"; |
142 | } |
d8aea268 |
143 | } |
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144 | : $t |
145 | }, |
146 | 'openhandle' => sub { |
147 | my $fh = shift; |
148 | my $rt = reftype($fh) || ''; |
29312fc3 |
149 | |
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150 | return defined(fileno($fh)) ? $fh : undef |
151 | if $rt eq 'IO'; |
29312fc3 |
152 | |
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153 | if (reftype(\$fh) eq 'GLOB') { # handle openhandle(*DATA) |
154 | $fh = \(my $tmp=$fh); |
155 | } |
156 | elsif ($rt ne 'GLOB') { |
157 | return undef; |
158 | } |
29312fc3 |
159 | |
42d7df00 |
160 | (tied(*$fh) or defined(fileno($fh))) |
161 | ? $fh : undef; |
162 | }, |
163 | weaken => { |
164 | loaded => \&Scalar::Util::weaken, |
165 | not_loaded => sub { die "Scalar::Util required for weak reference support" }, |
166 | }, |
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167 | # ^^^^^ CODE TAKEN FROM SCALAR::UTIL ^^^^^ |
42d7df00 |
168 | }, |
169 | 'MRO::Compat' => { |
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170 | # VVVVV CODE TAKEN FROM MRO::COMPAT VVVVV |
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171 | 'get_linear_isa' => { |
172 | loaded => \&mro::get_linear_isa, |
173 | not_loaded => do { |
174 | # this recurses so it isn't pretty |
175 | my $code; |
176 | $code = sub { |
177 | no strict 'refs'; |
178 | |
179 | my $classname = shift; |
180 | |
181 | my @lin = ($classname); |
182 | my %stored; |
183 | foreach my $parent (@{"$classname\::ISA"}) { |
184 | my $plin = $code->($parent); |
185 | foreach (@$plin) { |
186 | next if exists $stored{$_}; |
187 | push(@lin, $_); |
188 | $stored{$_} = 1; |
189 | } |
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190 | } |
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191 | return \@lin; |
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192 | } |
42d7df00 |
193 | }, |
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194 | }, |
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195 | # ^^^^^ CODE TAKEN FROM MRO::COMPAT ^^^^^ |
42d7df00 |
196 | }, |
42d7df00 |
197 | ); |
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198 | |
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199 | my %loaded; |
42d7df00 |
200 | for my $module_name (keys %dependencies) { |
201 | my $loaded = do { |
202 | local $SIG{__DIE__} = 'DEFAULT'; |
203 | eval "require $module_name; 1"; |
204 | }; |
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205 | |
42d7df00 |
206 | $loaded{$module_name} = $loaded; |
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207 | |
42d7df00 |
208 | for my $method_name (keys %{ $dependencies{ $module_name } }) { |
209 | my $producer = $dependencies{$module_name}{$method_name}; |
210 | my $implementation; |
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211 | |
42d7df00 |
212 | if (ref($producer) eq 'HASH') { |
213 | $implementation = $loaded |
214 | ? $producer->{loaded} |
215 | : $producer->{not_loaded}; |
216 | } |
217 | else { |
218 | $implementation = $loaded |
219 | ? $module_name->can($method_name) |
220 | : $producer; |
221 | } |
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222 | |
42d7df00 |
223 | no strict 'refs'; |
224 | *{ __PACKAGE__ . '::' . $method_name } = $implementation; |
225 | } |
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226 | } |
227 | } |
228 | |
2e92bb89 |
229 | sub apply_all_roles { |
230 | my $meta = Mouse::Meta::Class->initialize(shift); |
231 | my $role = shift; |
232 | confess "Mouse::Util only supports 'apply_all_roles' on individual roles at a time" if @_; |
233 | |
234 | Mouse::load_class($role); |
235 | $role->meta->apply($meta); |
236 | } |
237 | |
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238 | 1; |
239 | |
f38ce2d0 |
240 | __END__ |
241 | |
242 | =head1 NAME |
243 | |
244 | Mouse::Util - features, with or without their dependencies |
245 | |
246 | =head1 IMPLEMENTATIONS FOR |
247 | |
248 | =head2 L<MRO::Compat> |
249 | |
250 | =head3 get_linear_isa |
251 | |
252 | =head2 L<Scalar::Util> |
253 | |
254 | =head3 blessed |
255 | |
256 | =head3 looks_like_number |
257 | |
258 | =head3 reftype |
259 | |
260 | =head3 openhandle |
261 | |
262 | =head3 weaken |
263 | |
264 | C<weaken> I<must> be implemented in XS. If the user tries to use C<weaken> |
265 | without L<Scalar::Util>, an error is thrown. |
266 | |
ea0b9e39 |
267 | =head2 Test::Exception |
268 | |
269 | =head3 throws_ok |
270 | |
271 | =head3 lives_ok |
272 | |
f38ce2d0 |
273 | =cut |
274 | |