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######################################################################## |
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# housekeeping |
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######################################################################## |
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package Keyword::Value v0.1.1; |
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use v5.22; |
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6507
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use Keyword::Declare; |
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1322688
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5068
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use Data::Lock qw( dlock ); |
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46216
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519
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use Carp qw( carp croak ); |
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######################################################################## |
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# package variables |
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######################################################################## |
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our @CARP_NOT = ( __PACKAGE__ ); |
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# variable avoids having to export the sub into every caller's space. |
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our $const |
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= sub : lvalue |
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{ |
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50
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state $verbose = $ENV{ VERBOSE_KEYWORD_VALUE } // ''; |
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# lvalue delays dlock until after state sets its own magic flag. |
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$_[0] = $_[1] if @_ > 1; |
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0
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$_[0] // carp "Fixing undefined value" |
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if $verbose; |
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dlock $_[0]; |
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# returns ref from stack to allow assignment via lvalue. |
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$_[0] |
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}; |
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######################################################################## |
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# exported subs |
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######################################################################## |
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sub import |
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{ |
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# defined inside of "import" this pushes the "value" keyword |
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# into the caller's space. |
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# |
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# lock a variable (i.e., with a sigil). |
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# lacking a leading variable, constify the entire expression. |
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148785
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keyword value( Var $var, Expr $expr ) |
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{ |
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( 0 > index "$var", '::' ) |
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? "\$Keyword::Value::const->( my $var $expr )" |
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: "\$Keyword::Value::const->( $var $expr )" |
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} |
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75486
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keyword value ( Expr $expr ) |
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86
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{{{ |
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$Keyword::Value::const->( <{$expr}> ) |
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}}} |
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} |
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64
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# keep require happy |
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1 |
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__END__ |