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Eval::TypeTiny(3pm) User Contributed Perl Documentation Eval::TypeTiny(3pm)
NAME
Eval::TypeTiny - utility to evaluate a string of Perl code in a clean environment
STATUS
This module is covered by the Type-Tiny stability policy.
DESCRIPTION
This module is used by Type::Tiny to compile coderefs from strings of Perl code, and
hashrefs of variables to close over.
Functions
This module exports one function, which works much like the similarly named function from
Eval::Closure:
"eval_closure(source => $source, environment => \%env, %opt)"
Constants
The following constants may be exported, but are not by default.
"HAS_LEXICAL_SUBS"
Boolean indicating whether Eval::TypeTiny has support for lexical subs. (This feature
requires Perl 5.18.)
"ALIAS_IMPLEMENTATION"
Returns a string indicating what implementation of "alias => 1" is being used.
Eval::TypeTiny will automatically choose the best implementation. This constant can
be matched against the "IMPLEMENTAION_*" constants.
"IMPLEMENTATION_NATIVE"
If "ALIAS_IMPLEMENTATION eq IMPLEMENTATION_NATIVE" then Eval::TypeTiny is currently
using Perl 5.22's native alias feature. This requires Perl 5.22.
"IMPLEMENTATION_DEVEL_LEXALIAS"
If "ALIAS_IMPLEMENTATION eq IMPLEMENTATION_DEVEL_LEXALIAS" then Eval::TypeTiny is
currently using Devel::LexAlias to provide aliases.
"IMPLEMENTATION_PADWALKER"
If "ALIAS_IMPLEMENTATION eq IMPLEMENTATION_PADWALKER" then Eval::TypeTiny is currently
using PadWalker to provide aliases.
"IMPLEMENTATION_TIE"
If "ALIAS_IMPLEMENTATION eq IMPLEMENTATION_TIE" then Eval::TypeTiny is using the
fallback implementation of aliases using "tie". This is the slowest implementation,
and may cause problems in certain edge cases, like trying to alias already-tied
variables, but it's the only way to implement "alias => 1" without a recent version of
Perl or one of the two optional modules mentioned above.
EVALUATION ENVIRONMENT
The evaluation is performed in the presence of strict, but the absence of warnings. (This
is different to Eval::Closure which enables warnings for compiled closures.)
The feature pragma is not active in the evaluation environment, so the following will not
work:
use feature qw(say);
use Eval::TypeTiny qw(eval_closure);
my $say_all = eval_closure(
source => 'sub { say for @_ }',
);
$say_all->("Hello", "World");
The feature pragma does not "carry over" into the stringy eval. It is of course possible
to import pragmas into the evaluated string as part of the string itself:
use Eval::TypeTiny qw(eval_closure);
my $say_all = eval_closure(
source => 'sub { use feature qw(say); say for @_ }',
);
$say_all->("Hello", "World");
BUGS
Please report any bugs to <http://rt.cpan.org/Dist/Display.html?Queue=Type-Tiny>.
SEE ALSO
Eval::Closure, Error::TypeTiny::Compilation.
AUTHOR
Toby Inkster <tobyink AT cpan.org>.
COPYRIGHT AND LICENCE
This software is copyright (c) 2013-2014, 2017-2019 by Toby Inkster.
This is free software; you can redistribute it and/or modify it under the same terms as
the Perl 5 programming language system itself.
DISCLAIMER OF WARRANTIES
THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
PURPOSE.
perl v5.30.0 2019-12-28 Eval::TypeTiny(3pm)
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On Apache
Under GNU General Public License
2024-04-19 21:59 @18.117.142.128 CrawledBy Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)