141 lines
2.8 KiB
Perl
141 lines
2.8 KiB
Perl
package PPI::Token::Number::Float;
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=pod
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=head1 NAME
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PPI::Token::Number::Float - Token class for a floating-point number
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=head1 SYNOPSIS
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$n = 1.234;
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=head1 INHERITANCE
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PPI::Token::Number::Float
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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::Float> class is used for tokens that
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represent floating point numbers. A float is identified by n decimal
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point. Exponential notation (the C<e> or C<E>) is handled by the
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PPI::Token::Number::Exp class.
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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: 10.
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=cut
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sub base() { 10 }
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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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my $str = $self->_literal;
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my $neg = $str =~ s/^\-//;
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$str =~ s/^\./0./;
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my $val = 0+$str;
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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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# Allow digits
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return 1 if $char =~ /\d/o;
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if ( $char eq '.' ) { # A second decimal point? That gets complicated.
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if ( $t->{token}{content} =~ /\.$/ ) {
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# We have a .., which is an operator. Take the . off the end of the
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# token and finish it, then make the .. operator.
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chop $t->{token}{content};
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$t->{class} = $t->{token}->set_class( 'Number' );
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$t->_new_token('Operator', '..');
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return 0;
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} elsif ( $t->{token}{content} =~ /\._/ ) {
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($t->{token}{content}, my $bareword)
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= split /\./, $t->{token}{content};
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$t->{class} = $t->{token}->set_class( 'Number' );
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$t->_new_token('Operator', '.');
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$t->_new_token('Word', $bareword);
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$t->_new_token('Operator', '.');
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return 0;
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} else {
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$t->{class} = $t->{token}->set_class( 'Number::Version' );
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return 1;
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}
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}
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# perl seems to regard pretty much anything that's not strictly an exp num
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# as float + stuff
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my $char2 = substr $t->{line}, $t->{line_cursor}+1, 1;
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if ("$char$char2" =~ /[eE][0-9+-]/) {
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$t->{class} = $t->{token}->set_class( 'Number::Exp' );
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return 1;
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}
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# Doesn't fit a special case, or is after the end of the token
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# End of token.
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$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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