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################################################################ |
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# XML::Encoding |
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# |
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# Version 1.x Copyright 1998 Clark Cooper |
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# Changes in Version 2.00 onwards Copyright (C) 2007-2010 Steve Hay |
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# All rights reserved. |
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# |
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# This program is free software; you can redistribute it and/or |
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# modify it under the same terms as Perl itself. |
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# |
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# See pod documentation at the end of the file |
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# |
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package XML::Encoding; |
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23901
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use 5.008001; |
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use XML::Parser; |
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use strict; |
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use vars qw(@ISA $VERSION); |
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@ISA = qw(XML::Parser); |
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$VERSION = '2.09'; |
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sub new { |
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my $class = shift; |
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my $self = $class->SUPER::new(@_); |
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# Maybe require setting of PushPrefixFcn, PopPrefixFcn, and RangeSetFcn |
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$self->setHandlers(Start => \&start, End => \&end, Final => \&fini); |
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return $self; |
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} |
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sub start { |
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my ($exp, $el, %attr) = @_; |
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39
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return if $exp->{EN_Skip}; |
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$exp->xpcroak("Root element must be encmap") |
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if ($exp->depth == 0 and $el ne 'encmap'); |
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my $xpmode = $exp->{EN_ExpatMode}; |
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if ($el eq 'ch' |
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or $el eq 'range') |
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{ |
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my $byte = $attr{byte}; |
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$exp->xpcroak("Missing required byte attribute") |
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unless defined($byte); |
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$byte = cnvnumatt($exp, $byte, 'byte'); |
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$exp->xpcroak("byte attribute > 255") if $byte > 255; |
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56
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my $uni = $attr{uni}; |
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$exp->xpcroak("Missing required uni attribute") |
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unless defined($uni); |
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60
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$uni = cnvnumatt($exp, $uni, 'uni'); |
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$exp->xpcroak("uni attribute > 0xFFFF") if $uni > 0xFFFF; |
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63
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my $len = 1; |
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65
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if ($el eq 'range') { |
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$len = $attr{len}; |
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$exp->xpcroak("Missing required len attribute") |
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unless defined($len); |
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70
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$len = cnvnumatt($exp, $len, 'len'); |
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$exp->xpcroak("Len plus byte > 256") if ($len + $byte) > 256; |
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} |
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check_range($exp, $byte, $len, $uni) |
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if ($xpmode |
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and $byte < 128 |
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and $byte != $uni |
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and not $exp->in_element('prefix')); |
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my $range_set_fcn = $exp->{RangeSetFcn}; |
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if (defined $range_set_fcn) { |
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my $result = &$range_set_fcn($byte, $uni, $len); |
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$exp->xpcroak($result) |
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if ($xpmode and $result); |
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} |
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} |
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elsif ($el eq 'prefix') { |
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$exp->xpcroak("prefix nested too deep") |
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if ($xpmode and $exp->within_element('prefix') >= 3); |
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my $byte = $attr{byte}; |
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$exp->xpcroak("Missing required byte attribute") |
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unless defined($byte); |
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$byte = cnvnumatt($exp, $byte, 'byte'); |
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$exp->xpcroak("byte attribute > 255") if $byte > 255; |
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my $push_pfx_fcn = $exp->{PushPrefixFcn}; |
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if (defined $push_pfx_fcn) { |
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my $result = &$push_pfx_fcn($byte); |
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$exp->xpcroak($result) |
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if ($xpmode and $result); |
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} |
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} |
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elsif ($el eq 'encmap') { |
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my $name = $attr{name}; |
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107
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$exp->xpcroak("Missing required name attribute") |
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unless defined($name); |
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$exp->{EN_Name} = $name; |
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112
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my $expat = $attr{expat}; |
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if (defined($expat)) { |
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$exp->xpcroak("Value of expat attribute should be yes or no") |
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unless ($expat eq 'yes' or $expat eq 'no'); |
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$exp->{EN_ExpatMode} = $expat eq 'yes'; |
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} |
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else { |
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$exp->{EN_ExpatMode} = 0; |
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} |
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$exp->xpcroak("Not an expat mode encmap") |
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if ($exp->{ExpatRequired} and ! $exp->{EN_ExpatMode}); |
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} |
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else { |
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my $depth = $exp->depth; |
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$exp->xpcroak($exp, "Root element isn't encmap") |
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unless $depth; |
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129
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$exp->xpcarp("Skipping unrecognized element '$el'\n"); |
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$exp->{EN_Skip} = $depth; |
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} |
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133
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} # End start |
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sub end { |
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my ($exp, $el) = @_; |
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138
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if ($exp->{EN_Skip}) { |
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$exp->{EN_Skip} = 0 |
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if $exp->{EN_Skip} == $exp->depth; |
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} |
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elsif ($el eq 'prefix') { |
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my $xpmode = $exp->{EN_ExpatMode}; |
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145
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my $pop_pfx_fcn = $exp->{PopPrefixFcn}; |
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if (defined $pop_pfx_fcn) { |
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my $result = &$pop_pfx_fcn(); |
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$exp->xpcroak($result) |
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if ($xpmode and $result); |
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} |
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} |
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} # End end |
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154
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sub fini { |
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my ($exp) = @_; |
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$exp->{EN_Name}; |
157
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} # End fini |
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159
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sub check_range { |
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my ($exp, $start, $len, $uni) = @_; |
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162
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# The following characters are exceptions to the expat rule that characters |
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# in the ascii set (ordinal values < 128) must have the same value in the |
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# source encoding: $@\^`{}~' |
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# The ordinal values for these are 36,92,94,96,123,125,126,39 |
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# Any len >= 3 implies you have to be hitting some non-special |
167
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# For 2 just check start == 125 ('}') |
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# For 1 check individually. |
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170
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if ($len == 1) { |
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return if chr($start) =~ /[\$@\\^`{}~']/; |
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} |
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elsif ($len == 2 and $start == 125) { |
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return; |
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} |
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177
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$exp->xpcroak("Sets ascii character to non-ascii value"); |
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} |
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180
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sub cnvnumatt { |
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my ($exp, $str, $name) = @_; |
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183
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$exp->xpcroak("$name attribute is not a decimal or hex value") |
184
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unless ($str =~ /^(?:(\d+)|x([0-9a-f]+))$/i); |
185
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186
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if (defined($1)) { |
187
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return $str + 0; |
188
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} |
189
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else { |
190
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return hex($2); |
191
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} |
192
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} # End cnvnumatt |
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194
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1; |
195
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196
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__END__ |