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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 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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21590
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our $VERSION = '1.276'; |
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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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99
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=head1 SUPPORT |
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101
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See the L in the main module. |
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=head1 AUTHOR |
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105
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Chris Dolan Ecdolan@cpan.orgE |
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=head1 COPYRIGHT |
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109
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Copyright 2006 Chris Dolan. |
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111
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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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114
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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 |