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1 | package Eval::WithLexicals; |
2 | |
3 | use Moo; |
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4 | use Moo::Role (); |
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5 | use Sub::Quote; |
6 | |
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7 | our $VERSION = '1.003000'; # 1.3.0 |
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8 | $VERSION = eval $VERSION; |
9 | |
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10 | has lexicals => (is => 'rw', default => quote_sub q{ {} }); |
11 | |
12 | { |
13 | my %valid_contexts = map +($_ => 1), qw(list scalar void); |
14 | |
15 | has context => ( |
16 | is => 'rw', default => quote_sub(q{ 'list' }), |
17 | isa => sub { |
18 | my ($val) = @_; |
19 | die "Invalid context type $val - should be list, scalar or void" |
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20 | unless $valid_contexts{$val}; |
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21 | }, |
22 | ); |
23 | } |
24 | |
25 | has in_package => ( |
26 | is => 'rw', default => quote_sub q{ 'Eval::WithLexicals::Scratchpad' } |
27 | ); |
28 | |
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29 | has prelude => ( |
30 | is => 'rw', default => quote_sub q{ 'use strictures 1;' } |
31 | ); |
32 | |
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33 | sub with_plugins { |
34 | my($class, @names) = @_; |
35 | |
36 | Moo::Role->create_class_with_roles($class, |
37 | map "Eval::WithLexicals::With$_", @names); |
38 | } |
39 | |
40 | sub setup_code { |
41 | my($self) = @_; |
42 | $self->prelude; |
43 | } |
44 | |
45 | sub capture_code { |
46 | ( qq{ BEGIN { Eval::WithLexicals::Util::capture_list() } } ) |
47 | } |
48 | |
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49 | sub eval { |
50 | my ($self, $to_eval) = @_; |
51 | local *Eval::WithLexicals::Cage::current_line; |
52 | local *Eval::WithLexicals::Cage::pad_capture; |
53 | local *Eval::WithLexicals::Cage::grab_captures; |
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54 | |
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55 | my $package = $self->in_package; |
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56 | my $setup_code = join '', $self->setup_code, |
57 | # $_[2] being what is passed to _eval_do below |
58 | Sub::Quote::capture_unroll('$_[2]', $self->lexicals, 2); |
59 | |
60 | my $capture_code = join '', $self->capture_code; |
61 | |
62 | local our $current_code = qq! |
63 | ${setup_code} |
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64 | sub Eval::WithLexicals::Cage::current_line { |
65 | package ${package}; |
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66 | #line 1 "(eval)" |
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67 | ${to_eval} |
68 | ;sub Eval::WithLexicals::Cage::pad_capture { } |
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69 | ${capture_code} |
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70 | sub Eval::WithLexicals::Cage::grab_captures { |
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71 | no warnings 'closure'; no strict 'vars'; |
72 | package Eval::WithLexicals::VarScope;!; |
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73 | # rest is appended by Eval::WithLexicals::Util::capture_list, called |
74 | # during parsing by the BEGIN block from capture_code. |
75 | |
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76 | $self->_eval_do(\$current_code, $self->lexicals, $to_eval); |
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77 | $self->_run(\&Eval::WithLexicals::Cage::current_line); |
78 | } |
79 | |
80 | sub _run { |
81 | my($self, $code) = @_; |
82 | |
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83 | my @ret; |
84 | my $ctx = $self->context; |
85 | if ($ctx eq 'list') { |
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86 | @ret = $code->(); |
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87 | } elsif ($ctx eq 'scalar') { |
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88 | $ret[0] = $code->(); |
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89 | } else { |
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90 | $code->(); |
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91 | } |
92 | $self->lexicals({ |
93 | %{$self->lexicals}, |
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94 | %{$self->_grab_captures}, |
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95 | }); |
96 | @ret; |
97 | } |
98 | |
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99 | sub _grab_captures { |
100 | my ($self) = @_; |
101 | my $cap = Eval::WithLexicals::Cage::grab_captures(); |
102 | foreach my $key (keys %$cap) { |
103 | my ($sigil, $name) = $key =~ /^(.)(.+)$/; |
104 | my $var_scope_name = $sigil.'Eval::WithLexicals::VarScope::'.$name; |
105 | if ($cap->{$key} eq eval "\\${var_scope_name}") { |
106 | delete $cap->{$key}; |
107 | } |
108 | } |
109 | $cap; |
110 | } |
111 | |
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112 | sub _eval_do { |
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113 | my ($self, $text_ref, $lexical, $original) = @_; |
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114 | local @INC = (sub { |
115 | if ($_[1] eq '/eval_do') { |
116 | open my $fh, '<', $text_ref; |
117 | $fh; |
118 | } else { |
119 | (); |
120 | } |
121 | }, @INC); |
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122 | do '/eval_do' or die $@; |
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123 | } |
124 | |
125 | { |
126 | package Eval::WithLexicals::Util; |
127 | |
128 | use B qw(svref_2object); |
129 | |
130 | sub capture_list { |
131 | my $pad_capture = \&Eval::WithLexicals::Cage::pad_capture; |
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132 | my @names = grep $_ ne '&', map $_->PV, grep $_->isa('B::PV'), |
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133 | svref_2object($pad_capture)->OUTSIDE->PADLIST->ARRAYelt(0)->ARRAY; |
134 | $Eval::WithLexicals::current_code .= |
135 | '+{ '.join(', ', map "'$_' => \\$_", @names).' };' |
136 | ."\n}\n}\n1;\n"; |
137 | } |
138 | } |
139 | |
54153012 |
140 | 1; |
141 | __END__ |
142 | |
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143 | =head1 NAME |
144 | |
145 | Eval::WithLexicals - pure perl eval with persistent lexical variables |
146 | |
147 | =head1 SYNOPSIS |
148 | |
149 | # file: bin/tinyrepl |
150 | |
151 | #!/usr/bin/env perl |
152 | |
153 | use strictures 1; |
154 | use Eval::WithLexicals; |
155 | use Term::ReadLine; |
156 | use Data::Dumper; |
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157 | use Getopt::Long; |
158 | |
159 | GetOptions( |
160 | "plugin=s" => \my @plugins |
161 | ); |
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162 | |
163 | $SIG{INT} = sub { warn "SIGINT\n" }; |
164 | |
165 | { package Data::Dumper; no strict 'vars'; |
166 | $Terse = $Indent = $Useqq = $Deparse = $Sortkeys = 1; |
167 | $Quotekeys = 0; |
168 | } |
169 | |
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170 | my $eval = @plugins |
171 | ? Eval::WithLexicals->with_plugins(@plugins)->new |
172 | : Eval::WithLexicals->new; |
173 | |
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174 | my $read = Term::ReadLine->new('Perl REPL'); |
175 | while (1) { |
176 | my $line = $read->readline('re.pl$ '); |
177 | exit unless defined $line; |
178 | my @ret; eval { |
179 | local $SIG{INT} = sub { die "Caught SIGINT" }; |
180 | @ret = $eval->eval($line); 1; |
181 | } or @ret = ("Error!", $@); |
182 | print Dumper @ret; |
183 | } |
184 | |
185 | # shell session: |
186 | |
187 | $ perl -Ilib bin/tinyrepl |
188 | re.pl$ my $x = 0; |
189 | 0 |
190 | re.pl$ ++$x; |
191 | 1 |
192 | re.pl$ $x + 3; |
193 | 4 |
194 | re.pl$ ^D |
195 | $ |
196 | |
197 | =head1 METHODS |
198 | |
199 | =head2 new |
200 | |
201 | my $eval = Eval::WithLexicals->new( |
202 | lexicals => { '$x' => \1 }, # default {} |
203 | in_package => 'PackageToEvalIn', # default Eval::WithLexicals::Scratchpad |
204 | context => 'scalar', # default 'list' |
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205 | prelude => 'use warnings', # default 'use strictures 1' |
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206 | ); |
207 | |
208 | =head2 eval |
209 | |
210 | my @return_value = $eval->eval($code_to_eval); |
211 | |
212 | =head2 lexicals |
213 | |
214 | my $current_lexicals = $eval->lexicals; |
215 | |
216 | $eval->lexicals(\%new_lexicals); |
217 | |
218 | =head2 in_package |
219 | |
220 | my $current_package = $eval->in_package; |
221 | |
222 | $eval->in_package($new_package); |
223 | |
224 | =head2 context |
225 | |
226 | my $current_context = $eval->context; |
227 | |
228 | $eval->context($new_context); # 'list', 'scalar' or 'void' |
229 | |
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230 | =head2 prelude |
231 | |
232 | Code to run before evaling code. Loads L<strictures> by default. |
233 | |
234 | my $current_prelude = $eval->prelude; |
235 | |
236 | $eval->prelude(q{use warnings}); # only warnings, not strict. |
237 | |
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238 | =head2 with_plugins |
239 | |
240 | my $eval = Eval::WithLexicals->with_plugins("HintPersistence")->new; |
241 | |
242 | Construct a class with the given plugins. Plugins are roles located under |
243 | a package name like C<Eval::WithLexicals::With*>. |
244 | |
245 | Current plugins are: |
246 | |
247 | =over 4 |
248 | |
249 | =item * HintPersistence |
250 | |
251 | When enabled this will persist pragams and other compile hints between evals |
252 | (for example the L<strict> and L<warnings> flags in effect). See |
253 | L<Eval::WithLexicals::WithHintPersistence> for further details. |
254 | |
255 | =back |
256 | |
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257 | =head1 AUTHOR |
258 | |
259 | Matt S. Trout <mst@shadowcat.co.uk> |
260 | |
261 | =head1 CONTRIBUTORS |
262 | |
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263 | David Leadbeater <dgl@dgl.cx> |
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264 | |
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265 | haarg - Graham Knop (cpan:HAARG) <haarg@cpan.org> |
266 | |
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267 | =head1 COPYRIGHT |
268 | |
269 | Copyright (c) 2010 the Eval::WithLexicals L</AUTHOR> and L</CONTRIBUTORS> |
270 | as listed above. |
271 | |
272 | =head1 LICENSE |
273 | |
274 | This library is free software and may be distributed under the same terms |
275 | as perl itself. |
276 | |
277 | =cut |