/usr/share/perl5/PPI/Token/Number/Exp.pm is in libppi-perl 1.236-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 | package PPI::Token::Number::Exp;
=pod
=head1 NAME
PPI::Token::Number::Exp - Token class for an exponential notation number
=head1 SYNOPSIS
$n = 1.0e-2;
$n = 1e+2;
=head1 INHERITANCE
PPI::Token::Number::Exp
isa PPI::Token::Number::Float
isa PPI::Token::Number
isa PPI::Token
isa PPI::Element
=head1 DESCRIPTION
The C<PPI::Token::Number::Exp> class is used for tokens that
represent floating point numbers with exponential notation.
=head1 METHODS
=cut
use strict;
use PPI::Token::Number::Float ();
use vars qw{$VERSION @ISA};
BEGIN {
$VERSION = '1.236';
@ISA = 'PPI::Token::Number::Float';
}
=pod
=head2 literal
Return the numeric value of this token.
=cut
sub literal {
my $self = shift;
return if $self->{_error};
my ($mantissa, $exponent) = split m/e/i, $self->_literal;
my $neg = $mantissa =~ s/^\-//;
$mantissa =~ s/^\./0./;
$exponent =~ s/^\+//;
# This algorithm is reasonably close to the S_mulexp10()
# algorithm from the Perl source code, so it should arrive
# at the same answer as Perl most of the time.
my $negpow = 0;
if ($exponent < 0) {
$negpow = 1;
$exponent *= -1;
}
my $result = 1;
my $power = 10;
for (my $bit = 1; $exponent; $bit = $bit << 1) {
if ($exponent & $bit) {
$exponent = $exponent ^ $bit;
$result *= $power;
}
$power *= $power;
}
my $val = $neg ? 0 - $mantissa : $mantissa;
return $negpow ? $val / $result : $val * $result;
}
#####################################################################
# Tokenizer Methods
sub __TOKENIZER__on_char {
my $class = shift;
my $t = shift;
my $char = substr( $t->{line}, $t->{line_cursor}, 1 );
# To get here, the token must have already encountered an 'E'
# Allow underscores straight through
return 1 if $char eq '_';
# Allow digits
return 1 if $char =~ /\d/o;
# Start of exponent is special
if ( $t->{token}->{content} =~ /e$/i ) {
# Allow leading +/- in exponent
return 1 if $char eq '-' || $char eq '+';
# Invalid character in exponent. Recover
if ( $t->{token}->{content} =~ s/\.(e)$//i ) {
my $word = $1;
$t->{class} = $t->{token}->set_class('Number');
$t->_new_token('Operator', '.');
$t->_new_token('Word', $word);
return $t->{class}->__TOKENIZER__on_char( $t );
}
else {
$t->{token}->{_error} = "Illegal character in exponent '$char'";
}
}
# Doesn't fit a special case, or is after the end of the token
# End of token.
$t->_finalize_token->__TOKENIZER__on_char( $t );
}
1;
=pod
=head1 SUPPORT
See the L<support section|PPI/SUPPORT> in the main module.
=head1 AUTHOR
Chris Dolan E<lt>cdolan@cpan.orgE<gt>
=head1 COPYRIGHT
Copyright 2006 Chris Dolan.
This program is free software; you can redistribute
it and/or modify it under the same terms as Perl itself.
The full text of the license can be found in the
LICENSE file included with this module.
=cut
|