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#!/usr/bin/perl -w |
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# $Id: Number.pm,v 1.3 2003/10/28 17:18:10 andy Exp $ |
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# |
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# This code is copyright 1999-2000 by Scott Guelich |
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# and is distributed according to the same conditions as Perl itself |
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# Please visit http://www.scripted.com/wddx/ for more information |
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# |
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package WDDX::Number; |
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# Auto-inserted by build scripts |
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$VERSION = "1.01"; |
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use strict; |
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use Carp; |
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1037
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require WDDX; |
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{ my $i_hate_the_w_flag_sometimes = [ |
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$WDDX::PACKET_HEADER, |
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$WDDX::PACKET_FOOTER, |
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$WDDX::Number::VERSION |
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] } |
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1; |
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#/----------------------------------------------------------------------- |
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# Public Methods |
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# |
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sub new { |
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my( $class, $value ) = @_; |
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croak "You must supply a value when creating a new $class object\n" |
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unless defined $value; |
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$value += 0; |
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if ( $value > 1.7e308 or $value < -1.7e308 ) { |
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die "Number exceeds supported range of +/-1.7e308\n"; |
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} |
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# Is there a better/more accurate way to handle this? |
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# Also, does it make sense to only restrict precision to after decimal? |
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if ( ($value =~ /^(\+|-)?(\d*)(\.\d+)?(?:E(\+|-)?(\d+))?$/i) |
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and (defined $3) |
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and (length $3 > 16) ) { |
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warn "Floating point number exceeds supported accuracy; " . |
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"trimming to 15 digits.\n"; |
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$value = ( "$1$2" . substr( $3, 15 ) . "$4$5" ) + 0; |
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} |
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my $self = { |
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value => $value, |
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}; |
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bless $self, $class; |
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return $self; |
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} |
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sub type { |
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return "number"; |
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} |
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sub as_packet { |
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my( $self ) = @_; |
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my $output = $WDDX::PACKET_HEADER . |
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$self->_serialize . |
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$WDDX::PACKET_FOOTER; |
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} |
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sub as_scalar { |
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my( $self ) = @_; |
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return $self->_deserialize; |
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} |
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sub as_javascript { |
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my( $self, $js_var ) = @_; |
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return "$js_var=$self->{value};"; |
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} |
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#/----------------------------------------------------------------------- |
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# Private Methods |
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# |
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sub is_parser { |
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return 0; |
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} |
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sub _serialize { |
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my( $self ) = @_; |
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my $val = $self->{value} + 0; |
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my $output = "$val"; |
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return $output; |
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} |
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sub _deserialize { |
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my( $self ) = @_; |
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return $self->{value}; |
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} |
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111
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#/----------------------------------------------------------------------- |
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# Parsing Code |
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# |
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package WDDX::Number::Parser; |
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sub new { |
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return bless { value => "" }, shift; |
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} |
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sub start_tag { |
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my( $self, $element, $attribs ) = @_; |
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unless ( $element eq "number" ) { |
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die "<$element> not allowed within element\n"; |
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} |
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return $self; |
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} |
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sub end_tag { |
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my( $self, $element ) = @_; |
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my $value = $self->{value}; |
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unless ( $element eq "number" ) { |
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die "$element> not allowed within element\n"; |
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} |
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143
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unless ( $value =~ /^(?:\+|-)?\d*(\.\d+)?(?:E(?:\+|-)?(\d+))?$/i ) { |
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die "Invalid numeric value: '$value'\n"; |
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} |
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if ( (defined $1) && (length $1 > 16) ) { |
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die "Floating point number exceeds supported accuracy (15 digits)\n"; |
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} |
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if ( $value > 1.7e308 or $value < -1.7e308 ) { |
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die "Number exceeds supported range of +/-1.7e308\n"; |
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} |
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153
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$self = new WDDX::Number( $value + 0 ); |
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return $self; |
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} |
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158
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159
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# Not sure if it's appropriate to allow this to be called more than once. |
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# It's a number after all... shouldn't be split by whitespace or other tags. |
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sub append_data { |
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my( $self, $data ) = @_; |
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$self->{value} .= $data; |
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} |
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167
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sub is_parser { |
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return 1; |
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} |
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