/usr/share/perl5/SQL/Statement/Function.pm is in libsql-statement-perl 1.412-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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######################################################################
#
# This module is copyright (c), 2009-2017 by Jens Rehsack.
# All rights reserved.
#
# It may be freely distributed under the same terms as Perl itself.
# See below for help and copyright information (search for SYNOPSIS).
#
######################################################################
use strict;
use warnings FATAL => "all";
use vars qw(@ISA $VERSION);
use SQL::Statement::Term ();
@ISA = qw(SQL::Statement::Term);
$VERSION = '1.412';
=pod
=head1 NAME
SQL::Statement::Function - abstract base class for all function executing terms
=head1 SYNOPSIS
# this class doesn't have a common constructor, because all derived classes
# have their special requirements
=head1 DESCRIPTION
SQL::Statement::Function is an abstract base class providing the interface
for all function executing terms.
=head1 INHERITANCE
SQL::Statement::Function
ISA SQL::Statement::Term
=head1 METHODS
=head2 DESTROY
Destroys the term and undefines the weak reference to the owner as well
as the reference to the parameter list.
=cut
sub DESTROY
{
my $self = $_[0];
undef $self->{PARAMS};
$self->SUPER::DESTROY();
}
package SQL::Statement::Function::UserFunc;
use vars qw(@ISA);
use Carp ();
use Params::Util qw(_INSTANCE);
use SQL::Statement::Functions;
@ISA = qw(SQL::Statement::Function);
=pod
=head1 NAME
SQL::Statement::Function::UserFunc - implements executing a perl subroutine
=head1 SYNOPSIS
# create an user function term with an SQL::Statement object as owner,
# specifying the function name, the subroutine name (full qualified)
# and the parameters to the subroutine
my $term = SQL::Statement::Function::UserFunc->new( $owner, $name, $sub, \@params );
# access the result of that operation
$term->value( $eval );
=head1 DESCRIPTION
SQL::Statement::Function::UserFunc implements a term which returns the result
of the specified subroutine.
=head1 INHERITANCE
SQL::Statement::Function
ISA SQL::Statement::Term
=head1 METHODS
=head2 new
Instantiates a new C<SQL::Statement::Function::UserFunc> instance.
=head2 value
Invokes the given subroutine with the values of the params and return it's
result:
my @params = map { $_->value($eval); } @{ $self->{PARAMS} };
return $subpkg->$subname( $self->{OWNER}, @params );
=cut
sub new
{
my ( $class, $owner, $name, $subnm, $params ) = @_;
my $self = $class->SUPER::new($owner);
my ( $pkg, $sub ) = $subnm =~ m/^(.*::)([^:]+$)/;
if ( !$sub )
{
$sub = $subnm;
$pkg = 'main';
}
$pkg =~ s/::$//g;
$pkg = 'main' unless ($pkg);
$self->{SUB} = $sub;
$self->{PKG} = $pkg;
$self->{NAME} = $name;
$self->{PARAMS} = $params;
unless ( UNIVERSAL::can( $pkg, $sub ) )
{
unless ( 'main' eq $pkg )
{
my $mod = $pkg;
$mod =~ s|::|/|g;
$mod .= '.pm';
eval { require $mod; } unless ( defined( $INC{$mod} ) );
return $owner->do_err($@) if ($@);
}
$pkg->can($sub) or return $owner->do_err( "Can't find subroutine $pkg" . "::$sub" );
}
return $self;
}
sub value($)
{
my $self = $_[0];
my $eval = $_[1];
my $pkg = $self->{PKG};
my $sub = $self->{SUB};
my @params = map { $_->value($eval); } @{ $self->{PARAMS} };
return $pkg->$sub( $self->{OWNER}, @params ); # FIXME is $pkg just a string?
}
package SQL::Statement::Function::NumericEval;
use vars qw(@ISA);
use Params::Util qw(_NUMBER _INSTANCE);
@ISA = qw(SQL::Statement::Function);
=pod
=head1 NAME
SQL::Statement::Function::NumericEval - implements numeric evaluation of a term
=head1 SYNOPSIS
# create an user function term with an SQL::Statement object as owner,
# specifying the expression to evaluate and the parameters to the subroutine
my $term = SQL::Statement::NumericEval->new( $owner, $expr, \@params );
# access the result of that operation
$term->value( $eval );
=head1 DESCRIPTION
SQL::Statement::Function::NumericEval implements the numeric evaluation of a
term. All parameters are expected to be numeric.
=head1 INHERITANCE
SQL::Statement::Function::NumericEval
ISA SQL::Statement::Function
ISA SQL::Statement::Term
=head1 METHODS
=head2 new
Instantiates a new C<SQL::Statement::Function::NumericEval> instance.
Takes I<$owner>, I<$expr> and I<\@params> as arguments (in specified order).
=head2 value
Returns the result of the evaluated expression.
=cut
sub new
{
my ( $class, $owner, $expr, $params ) = @_;
my $self = $class->SUPER::new($owner);
$self->{EXPR} = $expr;
$self->{PARAMS} = $params;
return $self;
}
sub value($)
{
my ( $self, $eval ) = @_;
my @vals =
map { _INSTANCE( $_, 'SQL::Statement::Term' ) ? $_->value($eval) : $_ } @{ $self->{PARAMS} };
foreach my $val (@vals)
{
return $self->{OWNER}->do_err(qq~Bad numeric expression '$val'!~)
unless ( defined( _NUMBER($val) ) );
}
my $expr = $self->{EXPR};
$expr =~ s/\?(\d+)\?/$vals[$1]/g;
$expr =~ s/\s//g;
$expr =~ s/^([\)\(+\-\*\/\%0-9]+)$/$1/; # untaint
return eval $expr;
}
package SQL::Statement::Function::Trim;
use vars qw(@ISA);
BEGIN { @ISA = qw(SQL::Statement::Function); }
=pod
=head1 NAME
SQL::Statement::Function::Trim - implements the built-in trim function support
=head1 SYNOPSIS
# create an trim function term with an SQL::Statement object as owner,
# specifying the spec, char and the parameters to the subroutine
my $term = SQL::Statement::Trim->new( $owner, $spec, $char, \@params );
# access the result of that operation
$term->value( $eval );
=head1 DESCRIPTION
SQL::Statement::Function::Trim implements string trimming.
=head1 INHERITANCE
SQL::Statement::Function::Trim
ISA SQL::Statement::Function
ISA SQL::Statement::Term
=head1 METHODS
=head2 new
Instantiates a new C<SQL::Statement::Function::Trim> instance.
Takes I<$owner>, I<$spec>, I<$char> and I<\@params> as arguments
(in specified order).
Meaning of the parameters:
=over 4
=item I<$spec>
Can be on of 'LEADING', 'TRAILING' 'BOTH'. Trims the leading chars, trailing
chars or at both ends, respectively.
Defaults to 'BOTH'.
=item I<$char>
The character to trim - defaults to C<' '>
=item I<\@params>
Expected to be an array with exact 1 element (more aren't evaluated).
=back
=head2 value
Returns the trimmed value of first parameter argument.
=cut
sub new
{
my ( $class, $owner, $spec, $char, $params ) = @_;
$spec ||= 'BOTH';
$char ||= ' ';
my $self = $class->SUPER::new($owner);
$self->{PARAMS} = $params;
$self->{TRIMFN} = sub { my $s = $_[0]; $s =~ s/^$char*//g; return $s; }
if ( $spec =~ m/LEADING/ );
$self->{TRIMFN} = sub { my $s = $_[0]; $s =~ s/$char*$//g; return $s; }
if ( $spec =~ m/TRAILING/ );
$self->{TRIMFN} = sub { my $s = $_[0]; $s =~ s/^$char*//g; $s =~ s/$char*$//g; return $s; }
if ( $spec =~ m/BOTH/ );
return $self;
}
sub value($)
{
my $val = $_[0]->{PARAMS}->[0]->value( $_[1] );
$val = &{ $_[0]->{TRIMFN} }($val);
return $val;
}
package SQL::Statement::Function::SubString;
use vars qw(@ISA);
@ISA = qw(SQL::Statement::Function);
=pod
=head1 NAME
SQL::Statement::Function::SubString - implements the built-in sub-string function support
=head1 SYNOPSIS
# create an substr function term with an SQL::Statement object as owner,
# specifying the start and length of the sub string to extract from the
# first element of \@params
my $term = SQL::Statement::SubString->new( $owner, $start, $length, \@params );
# access the result of that operation
$term->value( $eval );
=head1 DESCRIPTION
SQL::Statement::Function::SubString implements a sub-string extraction term.
=head1 INHERITANCE
SQL::Statement::Function::SubString
ISA SQL::Statement::Function
ISA SQL::Statement::Term
=head1 METHODS
=head2 new
Instantiates a new C<SQL::Statement::Function::SubString> instance.
Takes I<$owner>, I<$start>, I<$length> and I<\@params> as arguments
(in specified order).
Meaning of the parameters:
=over 4
=item I<$start>
Specifies the start position to extract the sub-string. This is expected
to be a L<SQL::Statement::Term> instance. The first character in a string
has the position 1.
=item I<$length>
Specifies the length of the extracted sub-string. This is expected
to be a L<SQL::Statement::Term> instance.
If omitted, everything to the end of the string is returned.
=item I<\@params>
Expected to be an array with exact 1 element (more aren't evaluated).
=back
=head2 value
Returns the extracted sub-string value from first parameter argument.
=cut
sub new
{
my ( $class, $owner, $start, $length, $params ) = @_;
my $self = $class->SUPER::new($owner);
$self->{START} = $start;
$self->{LENGTH} = $length;
$self->{PARAMS} = $params;
return $self;
}
sub value($)
{
my $val = $_[0]->{PARAMS}->[0]->value( $_[1] );
my $start = $_[0]->{START}->value( $_[1] ) - 1;
my $length =
defined( $_[0]->{LENGTH} ) ? $_[0]->{LENGTH}->value( $_[1] ) : length($val) - $start;
return substr( $val, $start, $length );
}
package SQL::Statement::Function::StrConcat;
use vars qw(@ISA);
@ISA = qw(SQL::Statement::Function);
=pod
=head1 NAME
SQL::Statement::Function::StrConcat - implements the built-in string concatenation
=head1 SYNOPSIS
# create an substr function term with an SQL::Statement object as owner
# and \@params to concatenate
my $term = SQL::Statement::StrConcat->new( $owner, \@params );
# access the result of that operation
$term->value( $eval );
=head1 DESCRIPTION
SQL::Statement::Function::StrConcat implements a string concatenation term.
=head1 INHERITANCE
SQL::Statement::Function::StrConcat
ISA SQL::Statement::Function
ISA SQL::Statement::Term
=head1 METHODS
=head2 new
Instantiates a new C<SQL::Statement::Function::StrConcat> instance.
=head2 value
Returns the concatenated string composed of the parameter values.
=cut
sub new
{
my ( $class, $owner, $params ) = @_;
my $self = $class->SUPER::new($owner);
$self->{PARAMS} = $params;
return $self;
}
sub value($)
{
my $rc = '';
foreach my $val ( @{ $_[0]->{PARAMS} } )
{
my $catval = $val->value( $_[1] );
$rc .= defined($catval) ? $catval : '';
}
return $rc;
}
=head1 AUTHOR AND COPYRIGHT
Copyright (c) 2009-2017 by Jens Rehsack: rehsackATcpan.org
All rights reserved.
You may distribute this module under the terms of either the GNU
General Public License or the Artistic License, as specified in
the Perl README file.
=cut
1;
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