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# You may distribute under the terms of either the GNU General Public License |
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# or the Artistic License (the same terms as Perl itself) |
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# |
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# (C) Paul Evans, 2021-2023 -- leonerd@leonerd.org.uk |
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package Syntax::Operator::Equ 0.06; |
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1184799
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use v5.14; |
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use warnings; |
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use Carp; |
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require XSLoader; |
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XSLoader::load( __PACKAGE__, our $VERSION ); |
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=head1 NAME |
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C - equality operators that distinguish C |
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=head1 SYNOPSIS |
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On Perl v5.38 or later: |
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use v5.38; |
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use Syntax::Operator::Equ; |
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if($x equ $y) { |
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say "x and y are both undef, or both defined and equal strings"; |
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} |
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if($i === $j) { |
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say "i and j are both undef, or both defined and equal numbers"; |
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} |
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Or via L on Perl v5.14 or later: |
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use v5.14; |
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use Syntax::Keyword::Match; |
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use Syntax::Operator::Equ; |
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match($str : equ) { |
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case(undef) { say "The variable is not defined" } |
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case("") { say "The variable is defined but is empty" } |
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default { say "The string is non-empty" } |
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} |
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=head1 DESCRIPTION |
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This module provides infix operators that implement equality tests of strings |
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or numbers similar to perl's C and C<==> operators, except that they |
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consider C to be a distinct value, separate from the empty string or |
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the number zero. |
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These operators do not warn when either or both operands are C. They |
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yield true if both operands are C, false if exactly one operand is, or |
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otherwise behave the same as the regular string or number equality tests if |
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both operands are defined. |
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Support for custom infix operators was added in the Perl 5.37.x development |
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cycle and is available from development release v5.37.7 onwards, and therefore |
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in Perl v5.38 onwards. The documentation of L |
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describes the situation in more detail. |
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While Perl versions before this do not support custom infix operators, they |
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can still be used via C and hence L. |
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Custom keywords which attempt to parse operator syntax may be able to use |
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these. One such module is L; see the SYNOPSIS example |
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given above. |
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=cut |
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sub import |
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{ |
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my $class = shift; |
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my $caller = caller; |
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$class->import_into( $caller, @_ ); |
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} |
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sub import_into |
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{ |
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my $class = shift; |
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my ( $caller, @syms ) = @_; |
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@syms or @syms = qw( equ ); |
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my %syms = map { $_ => 1 } @syms; |
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$^H{"Syntax::Operator::Equ/equ"}++ if delete $syms{equ}; |
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foreach (qw( is_strequ is_numequ )) { |
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no strict 'refs'; |
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*{"${caller}::$_"} = \&{$_} if delete $syms{$_}; |
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} |
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croak "Unrecognised import symbols @{[ keys %syms ]}" if keys %syms; |
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} |
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=head1 OPERATORS |
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=head2 equ |
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my $equal = $lhs equ $rhs; |
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Yields true if both operands are C, or if both are defined and contain |
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equal string values. Yields false if given exactly one C, or two |
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unequal strings. |
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=head2 === |
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my $equal = $lhs === $rhs; |
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Yields true if both operands are C, or if both are defined and contain |
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equal numerical values. Yields false if given exactly one C, or two |
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unequal numbers. |
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Note that while this operator will not cause warnings about uninitialized |
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values, it can still warn if given defined stringy values that are not valid |
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as numbers. |
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=cut |
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=head1 FUNCTIONS |
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As a convenience, the following functions may be imported which implement the |
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same behaviour as the infix operators, though are accessed via regular |
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function call syntax. |
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These wrapper functions are implemented using L, and thus |
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have an optimising call-checker attached to them. In most cases, code which |
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calls them should not in fact have the full runtime overhead of a function |
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call because the underlying test operator will get inlined into the calling |
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code at compiletime. In effect, code calling these functions should run with |
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the same performance as code using the infix operators directly. |
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=head2 is_strequ |
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my $equal = is_strequ( $lhs, $rhs ); |
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A function version of the L stringy operator. |
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=head2 is_numequ |
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my $equal = is_numequ( $lhs, $rgh ); |
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A function version of the L===> numerical operator. |
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=cut |
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=head1 SEE ALSO |
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=over 4 |
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=item * |
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L - string equality and regexp match operator |
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=back |
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=head1 AUTHOR |
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Paul Evans |
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=cut |
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0x55AA; |