Provided by: libperl-critic-perl_1.130-1_all 
NAME
Perl::Critic::Utils - General utility subroutines and constants for Perl::Critic and derivative
distributions.
DESCRIPTION
This module provides several static subs and variables that are useful for developing
Perl::Critic::Policy subclasses. Unless you are writing Policy modules, you probably don't care about
this package.
INTERFACE SUPPORT
This is considered to be a public module. Any changes to its interface will go through a deprecation
cycle.
IMPORTABLE SUBS
"find_keywords( $doc, $keyword )"
DEPRECATED: Since version 0.11, every Policy is evaluated at each element of the document. So you
shouldn't need to go looking for a particular keyword. If you do want to use this, please import it
via the ":deprecated" tag, rather than directly, to mark the module as needing updating.
Given a PPI::Document as $doc, returns a reference to an array containing all the PPI::Token::Word
elements that match $keyword. This can be used to find any built-in function, method call, bareword,
or reserved keyword. It will not match variables, subroutine names, literal strings, numbers, or
symbols. If the document doesn't contain any matches, returns undef.
"is_assignment_operator( $element )"
Given a PPI::Token::Operator or a string, returns true if that token represents one of the assignment
operators (e.g. "= &&= ||= //= += -=" etc.).
"is_perl_global( $element )"
Given a PPI::Token::Symbol or a string, returns true if that token represents one of the global
variables provided by the English module, or one of the builtin global variables like %SIG, %ENV, or
@ARGV. The sigil on the symbol is ignored, so things like $ARGV or $ENV will still return true.
"is_perl_builtin( $element )"
Given a PPI::Token::Word, PPI::Statement::Sub, or string, returns true if that token represents a
call to any of the builtin functions defined in Perl 5.8.8.
"is_perl_bareword( $element )"
Given a PPI::Token::Word, PPI::Statement::Sub, or string, returns true if that token represents a
bareword (e.g. "if", "else", "sub", "package") defined in Perl 5.8.8.
"is_perl_filehandle( $element )"
Given a PPI::Token::Word, or string, returns true if that token represents one of the global
filehandles (e.g. "STDIN", "STDERR", "STDOUT", "ARGV") that are defined in Perl 5.8.8. Note that
this function will return false if given a filehandle that is represented as a typeglob (e.g. *STDIN)
"is_perl_builtin_with_list_context( $element )"
Given a PPI::Token::Word, PPI::Statement::Sub, or string, returns true if that token represents a
call to any of the builtin functions defined in Perl 5.8.8 that provide a list context to the
following tokens.
"is_perl_builtin_with_multiple_arguments( $element )"
Given a PPI::Token::Word, PPI::Statement::Sub, or string, returns true if that token represents a
call to any of the builtin functions defined in Perl 5.8.8 that can take multiple arguments.
"is_perl_builtin_with_no_arguments( $element )"
Given a PPI::Token::Word, PPI::Statement::Sub, or string, returns true if that token represents a
call to any of the builtin functions defined in Perl 5.8.8 that cannot take any arguments.
"is_perl_builtin_with_one_argument( $element )"
Given a PPI::Token::Word, PPI::Statement::Sub, or string, returns true if that token represents a
call to any of the builtin functions defined in Perl 5.8.8 that takes one and only one argument.
"is_perl_builtin_with_optional_argument( $element )"
Given a PPI::Token::Word, PPI::Statement::Sub, or string, returns true if that token represents a
call to any of the builtin functions defined in Perl 5.8.8 that takes no more than one argument.
The sets of values for which "is_perl_builtin_with_multiple_arguments()",
"is_perl_builtin_with_no_arguments()", "is_perl_builtin_with_one_argument()", and
"is_perl_builtin_with_optional_argument()" return true are disjoint and their union is precisely the
set of values that "is_perl_builtin()" will return true for.
"is_perl_builtin_with_zero_and_or_one_arguments( $element )"
Given a PPI::Token::Word, PPI::Statement::Sub, or string, returns true if that token represents a
call to any of the builtin functions defined in Perl 5.8.8 that takes no and/or one argument.
Returns true if any of "is_perl_builtin_with_no_arguments()", "is_perl_builtin_with_one_argument()",
and "is_perl_builtin_with_optional_argument()" returns true.
"is_qualified_name( $name )"
Given a string, PPI::Token::Word, or PPI::Token::Symbol, answers whether it has a module component,
i.e. contains "::".
"precedence_of( $element )"
Given a PPI::Token::Operator or a string, returns the precedence of the operator, where 1 is the
highest precedence. Returns undef if the precedence can't be determined (which is usually because it
is not an operator).
"is_hash_key( $element )"
Given a PPI::Element, returns true if the element is a literal hash key. PPI doesn't distinguish
between regular barewords (like keywords or subroutine calls) and barewords in hash subscripts (which
are considered literal). So this subroutine is useful if your Policy is searching for
PPI::Token::Word elements and you want to filter out the hash subscript variety. In both of the
following examples, "foo" is considered a hash key:
$hash1{foo} = 1;
%hash2 = (foo => 1);
But if the bareword is followed by an argument list, then perl treats it as a function call. So in
these examples, "foo" is not considered a hash key:
$hash1{ foo() } = 1;
&hash2 = (foo() => 1);
"is_included_module_name( $element )"
Given a PPI::Token::Word, returns true if the element is the name of a module that is being included
via "use", "require", or "no".
"is_integer( $value )"
Answers whether the parameter, as a string, looks like an integral value.
"is_class_name( $element )"
Given a PPI::Token::Word, returns true if the element that immediately follows this element is the
dereference operator "->". When a bareword has a "->" on the right side, it usually means that it is
the name of the class (from which a method is being called).
"is_label_pointer( $element )"
Given a PPI::Token::Word, returns true if the element is the label in a "next", "last", "redo", or
"goto" statement. Note this is not the same thing as the label declaration.
"is_method_call( $element )"
Given a PPI::Token::Word, returns true if the element that immediately precedes this element is the
dereference operator "->". When a bareword has a "->" on the left side, it usually means that it is
the name of a method (that is being called from a class).
"is_package_declaration( $element )"
Given a PPI::Token::Word, returns true if the element is the name of a package that is being
declared.
"is_subroutine_name( $element )"
Given a PPI::Token::Word, returns true if the element is the name of a subroutine declaration. This
is useful for distinguishing barewords and from function calls from subroutine declarations.
"is_function_call( $element )"
Given a PPI::Token::Word returns true if the element appears to be call to a static function.
Specifically, this function returns true if "is_hash_key", "is_method_call", "is_subroutine_name",
"is_included_module_name", "is_package_declaration", "is_perl_bareword", "is_perl_filehandle",
"is_label_pointer" and "is_subroutine_name" all return false for the given element.
"first_arg( $element )"
Given a PPI::Element that is presumed to be a function call (which is usually a PPI::Token::Word),
return the first argument. This is similar of "parse_arg_list()" and follows the same logic. Note
that for the code:
int($x + 0.5)
this function will return just the $x, not the whole expression. This is different from the behavior
of "parse_arg_list()". Another caveat is:
int(($x + $y) + 0.5)
which returns "($x + $y)" as a PPI::Structure::List instance.
"parse_arg_list( $element )"
Given a PPI::Element that is presumed to be a function call (which is usually a PPI::Token::Word),
splits the argument expressions into arrays of tokens. Returns a list containing references to each
of those arrays. This is useful because parentheses are optional when calling a function, and PPI
parses them very differently. So this method is a poor-man's parse tree of PPI nodes. It's not
bullet-proof because it doesn't respect precedence. In general, I don't like the way this function
works, so don't count on it to be stable (or even present).
"split_nodes_on_comma( @nodes )"
This has the same return type as "parse_arg_list()" but expects to be passed the nodes that represent
the interior of a list, like:
'foo', 1, 2, 'bar'
"is_script( $document )"
This subroutine is deprecated and will be removed in a future release. You should use the
"is_program()" in Perl::Critic::Document method instead.
"is_in_void_context( $token )"
Given a PPI::Token, answer whether it appears to be in a void context.
"policy_long_name( $policy_name )"
Given a policy class name in long or short form, return the long form.
"policy_short_name( $policy_name )"
Given a policy class name in long or short form, return the short form.
"all_perl_files( @directories )"
Given a list of directories, recursively searches through all the directories (depth first) and
returns a list of paths for all the files that are Perl code files. Any administrative files for CVS
or Subversion are skipped, as are things that look like temporary or backup files.
A Perl code file is:
• Any file that ends in .PL, .pl, .pm, or .t
• Any file that has a first line with a shebang containing 'perl'
"severity_to_number( $severity )"
If $severity is given as an integer, this function returns $severity but normalized to lie between
$SEVERITY_LOWEST and $SEVERITY_HIGHEST. If $severity is given as a string, this function returns the
corresponding severity number. If the string doesn't have a corresponding number, this function will
throw an exception.
"is_valid_numeric_verbosity( $severity )"
Answers whether the argument has a translation to a Violation format.
"verbosity_to_format( $verbosity_level )"
Given a verbosity level between 1 and 10, returns the corresponding predefined format string. These
formats are suitable for passing to the "set_format" method in Perl::Critic::Violation. See the
perlcritic documentation for a listing of the predefined formats.
"hashify( @list )"
Given @list, return a hash where @list is in the keys and each value is 1. Duplicate values in @list
are silently squished.
"interpolate( $literal )"
Given a $literal string that may contain control characters (e.g.. '\t' '\n'), this function does a
double interpolation on the string and returns it as if it had been declared in double quotes. For
example:
'foo \t bar \n' ...becomes... "foo \t bar \n"
"shebang_line( $document )"
Given a PPI::Document, test if it starts with "#!". If so, return that line. Otherwise return
undef.
"words_from_string( $str )"
Given config string $str, return all the words from the string. This is safer than splitting on
whitespace.
"is_unchecked_call( $element, $autodie_modules )"
Given a PPI::Element, test to see if it contains a function call whose return value is not checked.
The second argument is an array reference of module names which export "autodie". The "autodie"
module is always included in this list by default.
IMPORTABLE VARIABLES
$COMMA
$FATCOMMA
$COLON
$SCOLON
$QUOTE
$DQUOTE
$BACKTICK
$PERIOD
$PIPE
$EMPTY
$EQUAL
$SPACE
$SLASH
$BSLASH
$LEFT_PAREN
$RIGHT_PAREN
These character constants give clear names to commonly-used strings that can be hard to read when
surrounded by quotes and other punctuation. Can be imported in one go via the ":characters" tag.
$SEVERITY_HIGHEST
$SEVERITY_HIGH
$SEVERITY_MEDIUM
$SEVERITY_LOW
$SEVERITY_LOWEST
These numeric constants define the relative severity of violating each Perl::Critic::Policy. The
"get_severity" and "default_severity" methods of every Policy subclass must return one of these
values. Can be imported via the ":severities" tag.
$DEFAULT_VERBOSITY
The default numeric verbosity.
$DEFAULT_VERBOSITY_WITH_FILE_NAME
The numeric verbosity that corresponds to the format indicated by $DEFAULT_VERBOSITY, but with the
file name prefixed to it.
$TRUE
$FALSE
These are simple booleans. 1 and 0 respectively. Be mindful of using these with string equality.
"$FALSE ne $EMPTY". Can be imported via the ":booleans" tag.
IMPORT TAGS
The following groups of functions and constants are available as parameters to a "use Perl::Critic::Util"
statement.
":all"
The lot.
":booleans"
Includes: $TRUE, $FALSE
":severities"
Includes: $SEVERITY_HIGHEST, $SEVERITY_HIGH, $SEVERITY_MEDIUM, $SEVERITY_LOW, $SEVERITY_LOWEST,
@SEVERITY_NAMES
":characters"
Includes: $COLON, $COMMA, $DQUOTE, $EMPTY, $FATCOMMA, $PERIOD, $PIPE, $QUOTE, $BACKTICK, $SCOLON,
$SPACE, $SLASH, $BSLASH $LEFT_PAREN $RIGHT_PAREN
":classification"
Includes: "is_assignment_operator", "is_class_name", "is_function_call", "is_hash_key",
"is_included_module_name", "is_integer", "is_label_pointer", "is_method_call",
"is_package_declaration", "is_perl_bareword", "is_perl_builtin", "is_perl_filehandle",
"is_perl_global", "is_perl_builtin_with_list_context" "is_perl_builtin_with_multiple_arguments"
"is_perl_builtin_with_no_arguments" "is_perl_builtin_with_one_argument"
"is_perl_builtin_with_optional_argument" "is_perl_builtin_with_zero_and_or_one_arguments"
"is_qualified_name", "is_script", "is_subroutine_name", "is_unchecked_call"
"is_valid_numeric_verbosity"
See also Perl::Critic::Utils::PPI.
":data_conversion"
Generic manipulation, not having anything specific to do with Perl::Critic.
Includes: "hashify", "words_from_string", "interpolate"
":ppi"
Things for dealing with PPI, other than classification.
Includes: "first_arg", "parse_arg_list"
See also Perl::Critic::Utils::PPI.
":internal_lookup"
Translations between internal representations.
Includes: "severity_to_number", "verbosity_to_format"
":language"
Information about Perl not programmatically available elsewhere.
Includes: "precedence_of"
":deprecated"
Not surprisingly, things that are deprecated. It is preferred to use this tag to get to these
functions, rather than the function names themselves, so as to mark any module using them as needing
cleanup.
Includes: "find_keywords"
SEE ALSO
Perl::Critic::Utils::Constants, Perl::Critic::Utils::McCabe, Perl::Critic::Utils::PPI,
AUTHOR
Jeffrey Ryan Thalhammer <jeff@imaginative-software.com>
COPYRIGHT
Copyright (c) 2005-2011 Imaginative Software Systems. All rights reserved.
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.