/ 
Perl-ToPerl6-0.031
River stage zero No dependents
/ Perl::ToPerl6::Document

NAME

Perl::ToPerl6::Document - Caching wrapper around a PPI::Document.

SYNOPSIS

use PPI::Document;
use Perl::ToPerl6::Document;
my $doc = PPI::Document->new('Foo.pm');
$doc = Perl::ToPerl6::Document->new(-source => $doc);
## Then use the instance just like a PPI::Document

DESCRIPTION

Perl::ToPerl6 does a lot of iterations over the PPI document tree via the PPI::Document::find() method. To save some time, this class pre-caches a lot of the common find() calls in a single traversal. Then, on subsequent requests we return the cached data.

This is implemented as a facade, where method calls are handed to the stored PPI::Document instance.

CAVEATS

This facade does not implement the overloaded operators from PPI::Document (that is, the use overload ... work). Therefore, users of this facade must not rely on that syntactic sugar. So, for example, instead of my $source = "$doc"; you should write my $source = $doc->content();

Perhaps there is a CPAN module out there which implements a facade better than we do here?

INTERFACE SUPPORT

This is considered to be a public class. Any changes to its interface will go through a deprecation cycle.

CONSTRUCTOR

new(-source => $source_code, '-filename-override' => $filename, '-program-extensions' => [program_extensions])

Create a new instance referencing a PPI::Document instance. The $source_code can be the name of a file, a reference to a scalar containing actual source code, or a PPI::Document or PPI::Document::File.

In the event that $source_code is a reference to a scalar containing actual source code or a PPI::Document, the resulting Perl::ToPerl6::Document will not have a filename. This may cause Perl::ToPerl6::Document to incorrectly classify the source code as a module or script. To avoid this problem, you can optionally set the -filename-override to force the Perl::ToPerl6::Document to have a particular $filename. Do not use this option if $source_code is already the name of a file, or is a reference to a PPI::Document::File.

The '-program-extensions' argument is optional, and is a reference to a list of strings and/or regular expressions. The strings will be made into regular expressions matching the end of a file name, and any document whose file name matches one of the regular expressions will be considered a program.

If -program-extensions is not specified, or if it does not determine the document type, the document will be considered to be a program if the source has a shebang line or its file name (if any) matches m/ [.] PL \z /smx.

METHODS

ppi_document()

Accessor for the wrapped PPI::Document instance. Note that altering this instance in any way can cause unpredictable failures in Perl::ToPerl6's subsequent analysis because some caches may fall out of date.

find($wanted)
find_first($wanted)
find_any($wanted)

Caching wrappers around the PPI methods. If $wanted is a simple PPI class name, then the cache is employed. Otherwise we forward the call to the corresponding method of the PPI::Document instance.

namespaces()

Returns a list of the namespaces (package names) in the document.

subdocuments_for_namespace($namespace)

Returns a list of sub-documents containing the elements in the given namespace. For example, given that the current document is for the source

foo();
package Foo;
package Bar;
package Foo;

this method will return two Perl::ToPerl6::Documents for a parameter of "Foo". For more, see "split_ppi_node_by_namespace" in PPIx::Utilities::Node.

ppix_regexp_from_element($element)

Caching wrapper around PPIx::Regexp->new($element). If $element is a PPI::Element the cache is employed, otherwise it just returns the results of PPIx::Regexp->new(). In either case, it returns undef unless the argument is something that PPIx::Regexp actually understands.

element_is_in_lexical_scope_after_statement_containing( $inner, $outer )

Is the $inner element in lexical scope after the statement containing the $outer element?

In the case where $outer is itself a scope-defining element, returns true if $outer contains $inner. In any other case, $inner must be after the last element of the statement containing $outer, and the innermost scope for $outer also contains $inner.

This is not the same as asking whether $inner is visible from $outer.

filename()

Returns the filename for the source code if applicable (PPI::Document::File) or undef otherwise (PPI::Document).

isa( $classname )

To be compatible with other modules that expect to get a PPI::Document, the Perl::ToPerl6::Document class masquerades as the PPI::Document class.

highest_explicit_perl_version()

Returns a version object for the highest Perl version requirement declared in the document via a use or require statement. Returns nothing if there is no version statement.

uses_module($module_or_pragma_name)

Answers whether there is a use, require, or no of the given name in this document. Note that there is no differentiation of modules vs. pragmata here.

process_annotations()

Causes this Document to scan itself and mark which lines & transformers are disabled by the "## no mogrify" annotations.

line_is_disabled_for_transformer($line, $transformer_object)

Returns true if the given $transformer_object or $transformer_name has been disabled for at $line in this Document. Otherwise, returns false.

add_annotation( $annotation )

Adds an $annotation object to this Document.

annotations()

Returns a list containing all the Perl::ToPerl6::Annotations that were found in this Document.

add_suppressed_transformation($transformation)

Informs this Document that a $transformation was found but not reported because it fell on a line that had been suppressed by a "## no mogrify" annotation. Returns $self.

suppressed_transformations()

Returns a list of references to all the Perl::ToPerl6::Transformations that were found in this Document but were suppressed.

is_program()

Returns whether this document is considered to be a program.

is_module()

Returns whether this document is considered to be a Perl module.

AUTHOR

Chris Dolan <cdolan@cpan.org>

COPYRIGHT

Copyright (c) 2006-2011 Chris Dolan.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. The full text of this license can be found in the LICENSE file included with this module.