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1 | package Eval::WithLexicals; |
2 | |
3 | use Moo; |
4 | use Sub::Quote; |
5 | |
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6 | our $VERSION = '1.001000'; # 1.1.0 |
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7 | $VERSION = eval $VERSION; |
8 | |
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9 | has lexicals => (is => 'rw', default => quote_sub q{ {} }); |
10 | |
11 | { |
12 | my %valid_contexts = map +($_ => 1), qw(list scalar void); |
13 | |
14 | has context => ( |
15 | is => 'rw', default => quote_sub(q{ 'list' }), |
16 | isa => sub { |
17 | my ($val) = @_; |
18 | die "Invalid context type $val - should be list, scalar or void" |
19 | unless $valid_contexts{$val}; |
20 | }, |
21 | ); |
22 | } |
23 | |
24 | has in_package => ( |
25 | is => 'rw', default => quote_sub q{ 'Eval::WithLexicals::Scratchpad' } |
26 | ); |
27 | |
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28 | has prelude => ( |
29 | is => 'rw', default => quote_sub q{ 'use strictures 1;' } |
30 | ); |
31 | |
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32 | sub eval { |
33 | my ($self, $to_eval) = @_; |
34 | local *Eval::WithLexicals::Cage::current_line; |
35 | local *Eval::WithLexicals::Cage::pad_capture; |
36 | local *Eval::WithLexicals::Cage::grab_captures; |
37 | my $setup = Sub::Quote::capture_unroll('$_[2]', $self->lexicals, 2); |
38 | my $package = $self->in_package; |
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39 | my $prelude = $self->prelude; |
40 | local our $current_code = qq!${prelude} |
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41 | ${setup} |
42 | sub Eval::WithLexicals::Cage::current_line { |
43 | package ${package}; |
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44 | #line 1 "(eval)" |
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45 | ${to_eval} |
46 | ;sub Eval::WithLexicals::Cage::pad_capture { } |
47 | BEGIN { Eval::WithLexicals::Util::capture_list() } |
48 | sub Eval::WithLexicals::Cage::grab_captures { |
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49 | no warnings 'closure'; no strict 'vars'; |
50 | package Eval::WithLexicals::VarScope;!; |
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51 | $self->_eval_do(\$current_code, $self->lexicals, $to_eval); |
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52 | my @ret; |
53 | my $ctx = $self->context; |
54 | if ($ctx eq 'list') { |
55 | @ret = Eval::WithLexicals::Cage::current_line(); |
56 | } elsif ($ctx eq 'scalar') { |
57 | $ret[0] = Eval::WithLexicals::Cage::current_line(); |
58 | } else { |
59 | Eval::WithLexicals::Cage::current_line(); |
60 | } |
61 | $self->lexicals({ |
62 | %{$self->lexicals}, |
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63 | %{$self->_grab_captures}, |
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64 | }); |
65 | @ret; |
66 | } |
67 | |
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68 | sub _grab_captures { |
69 | my ($self) = @_; |
70 | my $cap = Eval::WithLexicals::Cage::grab_captures(); |
71 | foreach my $key (keys %$cap) { |
72 | my ($sigil, $name) = $key =~ /^(.)(.+)$/; |
73 | my $var_scope_name = $sigil.'Eval::WithLexicals::VarScope::'.$name; |
74 | if ($cap->{$key} eq eval "\\${var_scope_name}") { |
75 | delete $cap->{$key}; |
76 | } |
77 | } |
78 | $cap; |
79 | } |
80 | |
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81 | sub _eval_do { |
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82 | my ($self, $text_ref, $lexicals, $original) = @_; |
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83 | local @INC = (sub { |
84 | if ($_[1] eq '/eval_do') { |
85 | open my $fh, '<', $text_ref; |
86 | $fh; |
87 | } else { |
88 | (); |
89 | } |
90 | }, @INC); |
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91 | do '/eval_do' or die $@; |
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92 | } |
93 | |
94 | { |
95 | package Eval::WithLexicals::Util; |
96 | |
97 | use B qw(svref_2object); |
98 | |
99 | sub capture_list { |
100 | my $pad_capture = \&Eval::WithLexicals::Cage::pad_capture; |
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101 | my @names = grep $_ ne '&', map $_->PV, grep $_->isa('B::PV'), |
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102 | svref_2object($pad_capture)->OUTSIDE->PADLIST->ARRAYelt(0)->ARRAY; |
103 | $Eval::WithLexicals::current_code .= |
104 | '+{ '.join(', ', map "'$_' => \\$_", @names).' };' |
105 | ."\n}\n}\n1;\n"; |
106 | } |
107 | } |
108 | |
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109 | =head1 NAME |
110 | |
111 | Eval::WithLexicals - pure perl eval with persistent lexical variables |
112 | |
113 | =head1 SYNOPSIS |
114 | |
115 | # file: bin/tinyrepl |
116 | |
117 | #!/usr/bin/env perl |
118 | |
119 | use strictures 1; |
120 | use Eval::WithLexicals; |
121 | use Term::ReadLine; |
122 | use Data::Dumper; |
123 | |
124 | $SIG{INT} = sub { warn "SIGINT\n" }; |
125 | |
126 | { package Data::Dumper; no strict 'vars'; |
127 | $Terse = $Indent = $Useqq = $Deparse = $Sortkeys = 1; |
128 | $Quotekeys = 0; |
129 | } |
130 | |
131 | my $eval = Eval::WithLexicals->new; |
132 | my $read = Term::ReadLine->new('Perl REPL'); |
133 | while (1) { |
134 | my $line = $read->readline('re.pl$ '); |
135 | exit unless defined $line; |
136 | my @ret; eval { |
137 | local $SIG{INT} = sub { die "Caught SIGINT" }; |
138 | @ret = $eval->eval($line); 1; |
139 | } or @ret = ("Error!", $@); |
140 | print Dumper @ret; |
141 | } |
142 | |
143 | # shell session: |
144 | |
145 | $ perl -Ilib bin/tinyrepl |
146 | re.pl$ my $x = 0; |
147 | 0 |
148 | re.pl$ ++$x; |
149 | 1 |
150 | re.pl$ $x + 3; |
151 | 4 |
152 | re.pl$ ^D |
153 | $ |
154 | |
155 | =head1 METHODS |
156 | |
157 | =head2 new |
158 | |
159 | my $eval = Eval::WithLexicals->new( |
160 | lexicals => { '$x' => \1 }, # default {} |
161 | in_package => 'PackageToEvalIn', # default Eval::WithLexicals::Scratchpad |
162 | context => 'scalar', # default 'list' |
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163 | prelude => 'use warnings', # default 'use strictures 1' |
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164 | ); |
165 | |
166 | =head2 eval |
167 | |
168 | my @return_value = $eval->eval($code_to_eval); |
169 | |
170 | =head2 lexicals |
171 | |
172 | my $current_lexicals = $eval->lexicals; |
173 | |
174 | $eval->lexicals(\%new_lexicals); |
175 | |
176 | =head2 in_package |
177 | |
178 | my $current_package = $eval->in_package; |
179 | |
180 | $eval->in_package($new_package); |
181 | |
182 | =head2 context |
183 | |
184 | my $current_context = $eval->context; |
185 | |
186 | $eval->context($new_context); # 'list', 'scalar' or 'void' |
187 | |
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188 | =head2 prelude |
189 | |
190 | Code to run before evaling code. Loads L<strictures> by default. |
191 | |
192 | my $current_prelude = $eval->prelude; |
193 | |
194 | $eval->prelude(q{use warnings}); # only warnings, not strict. |
195 | |
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196 | =head1 AUTHOR |
197 | |
198 | Matt S. Trout <mst@shadowcat.co.uk> |
199 | |
200 | =head1 CONTRIBUTORS |
201 | |
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202 | David Leadbeater <dgl@dgl.cx> |
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203 | |
204 | =head1 COPYRIGHT |
205 | |
206 | Copyright (c) 2010 the Eval::WithLexicals L</AUTHOR> and L</CONTRIBUTORS> |
207 | as listed above. |
208 | |
209 | =head1 LICENSE |
210 | |
211 | This library is free software and may be distributed under the same terms |
212 | as perl itself. |
213 | |
214 | =cut |
215 | |
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216 | 1; |