NAME¶
Perl::Critic::Utils::PPI - Utility functions for dealing with PPI objects.
DESCRIPTION¶
Provides classification of PPI::Elements.
INTERFACE SUPPORT¶
This is considered to be a public module. Any changes to its interface will go
through a deprecation cycle.
IMPORTABLE SUBS¶
- "is_ppi_expression_or_generic_statement( $element )"
- Answers whether the parameter is an expression or an undifferentiated
statement. I.e. the parameter either is a PPI::Statement::Expression or
the class of the parameter is PPI::Statement and not one of its subclasses
other than "Expression".
- "is_ppi_generic_statement( $element )"
- Answers whether the parameter is an undifferentiated statement, i.e. the
parameter is a PPI::Statement but not one of its subclasses.
- "is_ppi_statement_subclass( $element )"
- Answers whether the parameter is a specialized statement, i.e. the
parameter is a PPI::Statement but the class of the parameter is not
PPI::Statement.
- "is_ppi_simple_statement( $element )"
- Answers whether the parameter represents a simple statement, i.e. whether
the parameter is a PPI::Statement, PPI::Statement::Break,
PPI::Statement::Include, PPI::Statement::Null, PPI::Statement::Package, or
PPI::Statement::Variable.
- "is_ppi_constant_element( $element )"
- Answers whether the parameter represents a constant value, i.e. whether
the parameter is a PPI::Token::Number, PPI::Token::Quote::Literal,
PPI::Token::Quote::Single, or PPI::Token::QuoteLike::Words, or is a
PPI::Token::Quote::Double or PPI::Token::Quote::Interpolate which does not
in fact contain any interpolated variables.
This subroutine does not interpret any form of here document as a
constant value, and may not until PPI::Token::HereDoc acquires the
relevant portions of the PPI::Token::Quote interface.
This subroutine also does not interpret entities created by the
Readonly module or the constant pragma as constants, because the
infrastructure to detect these appears not to be present, and the author
of this subroutine ( not Mr. Shank or Mr. Thalhammer) lacks the
knowledge/expertise/gumption to put it in place.
- "is_subroutine_declaration( $element )"
- Is the parameter a subroutine declaration, named or not?
- "is_in_subroutine( $element )"
- Is the parameter a subroutine or inside one?
- "get_constant_name_element_from_declaring_statement($statement)"
- This subroutine is deprecated. You should use "
get_constant_name_elements_from_declaring_statement()" in
PPIx::Utilities::Statement instead.
Given a PPI::Statement, if the statement is a "use constant" or
Readonly declaration statement, return the name of the thing being
defined.
Given
use constant 1.16 FOO => 'bar';
this will return "FOO". Similarly, given
Readonly::Hash my %FOO => ( bar => 'baz' );
this will return "%FOO".
Caveat: in the case where multiple constants are declared using the
same "use constant" statement (e.g. "use constant { FOO
=> 1, BAR => 2 };", this subroutine will return the declaring
PPI::Structure::Constructor. In the case of "use constant 1.16 { FOO
=> 1, BAR => 2 };" it may return a PPI::Structure::Block
instead of a PPI::Structure::Constructor, due to a parse error in
PPI.
- "get_next_element_in_same_simple_statement( $element )"
- Given a PPI::Element, this subroutine returns the next element in the same
simple statement as defined by is_ppi_simple_statement(). If no
next element can be found, this subroutine simply returns.
If the $element is undefined or unblessed, we simply return.
If the $element satisfies "is_ppi_simple_statement()", we return,
unless it has a parent which is a PPI::Structure::List.
If the $element is the last significant element in its PPI::Node, we replace
it with its parent and iterate again.
Otherwise, we return "$element->snext_sibling()".
- "get_previous_module_used_on_same_line( $element )"
- Given a PPI::Element, returns the PPI::Element representing the name of
the module included by the previous "use" or "require"
on the same line as the $element. If none is found, simply returns.
For example, with the line
use version; our $VERSION = ...;
given the PPI::Token::Symbol instance for $VERSION, this will return
"version".
If the given element is in a "use" or <require>, the return
is from the previous "use" or "require" on the line,
if any.
AUTHOR¶
Elliot Shank <perl@galumph.com>
COPYRIGHT¶
Copyright (c) 2007-2011 Elliot Shank.
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.