118 lines
1.9 KiB
Perl
118 lines
1.9 KiB
Perl
package PPI::Token::Number::Binary;
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=pod
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=head1 NAME
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PPI::Token::Number::Binary - Token class for a binary number
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=head1 SYNOPSIS
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$n = 0b1110011; # binary integer
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=head1 INHERITANCE
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PPI::Token::Number::Binary
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isa PPI::Token::Number
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isa PPI::Token
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isa PPI::Element
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=head1 DESCRIPTION
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The C<PPI::Token::Number::Binary> class is used for tokens that
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represent base-2 numbers.
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=head1 METHODS
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=cut
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use strict;
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use PPI::Token::Number ();
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our $VERSION = '1.270'; # VERSION
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our @ISA = "PPI::Token::Number";
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=pod
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=head2 base
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Returns the base for the number: 2.
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=cut
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sub base() { 2 }
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=pod
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=head2 literal
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Return the numeric value of this token.
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=cut
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sub literal {
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my $self = shift;
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return if $self->{_error};
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my $str = $self->_literal;
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my $neg = $str =~ s/^\-//;
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$str =~ s/^0[bB]//;
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my $val = 0;
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for my $bit ( $str =~ m/(.)/g ) {
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$val = $val * 2 + $bit;
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}
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return $neg ? -$val : $val;
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}
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#####################################################################
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# Tokenizer Methods
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sub __TOKENIZER__on_char {
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my $class = shift;
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my $t = shift;
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my $char = substr( $t->{line}, $t->{line_cursor}, 1 );
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# Allow underscores straight through
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return 1 if $char eq '_';
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if ( $char =~ /[\w\d]/ ) {
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unless ( $char eq '1' or $char eq '0' ) {
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# Add a warning if it contains non-binary chars
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$t->{token}->{_error} = "Illegal character in binary number '$char'";
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}
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return 1;
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}
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# Doesn't fit a special case, or is after the end of the token
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# End of token.
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$t->_finalize_token->__TOKENIZER__on_char( $t );
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}
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1;
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=pod
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=head1 SUPPORT
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See the L<support section|PPI/SUPPORT> in the main module.
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=head1 AUTHOR
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Chris Dolan E<lt>cdolan@cpan.orgE<gt>
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=head1 COPYRIGHT
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Copyright 2006 Chris Dolan.
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This program is free software; you can redistribute
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it and/or modify it under the same terms as Perl itself.
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The full text of the license can be found in the
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LICENSE file included with this module.
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=cut
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