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package SVG::Parser; |
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use strict; |
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require 5.004; |
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use vars qw(@ISA $VERSION); |
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$VERSION="1.03"; |
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#------------------------------------------------------------------------------- |
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# Pick a parser, any parser... |
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# Override this list in import to force a different choosing order |
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@ISA=qw(SVG::Parser::SAX SVG::Parser::Expat) unless @ISA; |
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#@ISA=qw(SVG::Parser::Expat SVG::Parser::SAX) unless @ISA; |
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#------------------------------------------------------------------------------- |
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# Import method to change default inheritance, if required |
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sub import { |
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my $package=shift; |
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@ISA=@_ if @_; |
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my @classes; |
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foreach my $superclassspec (@ISA) { |
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# extract parameters to pass to superclass import method if present |
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my ($superclass,$importlist)=split /=/,$superclassspec,2; |
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my @importlist=$importlist ? (split '=',$importlist) : (); |
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# shorthand shortcuts |
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$superclass="SVG::Parser::SAX" if $superclass eq 'SAX'; |
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$superclass="SVG::Parser::Expat" if $superclass eq 'Expat'; |
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# test each superclass specifier in turn |
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if (eval qq[use $superclass qw(@importlist); 1;]) { |
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@ISA = ($superclass); |
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return; |
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} |
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push @classes,"$superclass qw(",(join " ",@importlist),")"; |
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} |
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die "No XML parser found (searched for ",(join ",",@classes),")\n"; |
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} |
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#------------------------------------------------------------------------------- |
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# Allow basic calls to 'parse' to handle strings and handles equally well for |
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# either parser. More complex API usage will not work. |
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sub parse { |
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my ($self,$source,%args)=@_; |
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my $type=$self->identify($source) or return ""; |
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if ($type eq $self->ARG_IS_HANDLE) { |
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57
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# both parse()rs will accept a handle |
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0
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return $self->SUPER::parse($source,%args); |
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} elsif ($type eq $self->ARG_IS_STRING) { |
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# the API for strings, however, differs |
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1
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if ($self->isa("SVG::Parser::SAX")) { |
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1
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my %parser_options=( Source => {String => $source} ); |
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return $self->SUPER::parse(%parser_options,%args); |
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} else { |
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0
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return $self->SUPER::parse($source,%args); |
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} |
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} else { |
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# a hash reference only makes sense to the SAX parser |
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70
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2
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if ($self->isa("SVG::Parser::SAX")) { |
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# combine extra hash values if present |
72
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2
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$source={ %$source, %args }; |
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return $self->SUPER::parse($source); |
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} else { |
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# the source is unknown |
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0
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die "Invalid argument $source to SVG::Parser in Expat mode"; |
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} |
78
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} |
79
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} |
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81
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#------------------------------------------------------------------------------- |
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83
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=head1 NAME |
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85
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SVG::Parser - XML Parser for SVG documents |
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87
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=head1 SYNOPSIS |
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89
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#!/usr/bin/perl -w |
90
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use strict; |
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use SVG::Parser; |
92
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93
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die "Usage: $0 \n" unless @ARGV; |
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95
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my $xml; |
96
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{ |
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local $/=undef; |
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$xml=<>; |
99
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} |
100
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101
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my $parser=new SVG::Parser(-debug => 1); |
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my $svg=$parser->parse($xml); |
103
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print $svg->xmlify; |
104
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105
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and: |
106
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107
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#!/usr/bin/perl -w |
108
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use strict; |
109
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use SVG::Parser qw(SAX=XML::LibXML::Parser::SAX Expat SAX); |
110
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111
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die "Usage: $0 \n" unless @ARGV; |
112
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my $svg=SVG::Parser->new()->parsefile($ARGV[0]); |
113
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print $svg->xmlify; |
114
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115
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116
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117
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=head1 DESCRIPTION |
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119
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SVG::Parser is an XML parser for SVG Documents. It takes XML as input and |
120
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produces an SVG object as its output. |
121
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122
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SVG::Parser supports both XML::SAX and XML::Parser (Expat) parsers, with SAX |
123
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preferred by default. Only one of these needs to be installed for SVG::Parser |
124
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to function. |
125
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126
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A list of preferred parsers may be specified in the import list - SVG::Parser |
127
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will use the first parser that successfully loads. Some basic measures are taken |
128
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to provide cross-compatability. Applications requiring more advanced parser |
129
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features should use the relevant parser module directly; see |
130
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L and L. |
131
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132
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=head2 METHODS |
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134
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SVG::Parser provides all methods supported by its parent parser class. In |
135
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addition it provides the following: |
136
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137
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=over 4 |
138
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139
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=item * new([%attrs]) |
140
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141
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Create a new SVG::Parser object. Optional attributes may be passed as arguments; |
142
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all attributes without a leading '-' prefix are passed to the parent |
143
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constructor. For example: |
144
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145
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my $parser=new SVG::Parser(%parser_options); |
146
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147
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Note that parser options are dependant on which parser type is selected. |
148
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149
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Attributes with a leading '-' are processed by SVG::Parser. Currently the only |
150
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recognised attribute is '-debug', which generates a simple but possibly useful |
151
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debug trace of the parsing process to standard error. For example: |
152
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153
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my $parser=new SVG::Parser(-debug => 1); |
154
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155
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or: |
156
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157
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my $parser=SVG::Parser->new(-debug => 1); |
158
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159
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Attributes with a leading '--' are passed to the SVG constructor when creating |
160
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the SVG object returned as the result of the parse: |
161
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162
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my $parser=new SVG::Parser( |
163
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-debug => 1, |
164
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"--indent" => "\t", |
165
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"--raiseerror" => 1 |
166
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); |
167
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168
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The leading '-' is stripped from attribute names passed this way, so this sets |
169
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the '-indent' and '-raiseerror' attributes in the SVG module. See L |
170
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list of valid SVG options. |
171
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172
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(The C constructor is provided by XML::SAX::Expat or SVG::Parser::SAX, |
173
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but operates identically in either case.) |
174
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175
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=item * parse($xml) |
176
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177
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Parse an XML document and return an SVG object which may then be used to |
178
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manipulate the SVG content before regenerating the output XML. For example: |
179
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180
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my $svg=$parser->parse($svgxml); |
181
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182
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Because the parse() method differs in use beteen XML::Parser and XML::SAX, |
183
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SVG::Parser provides its own parse() method. This calls the parent parser with |
184
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the correct first argument when given either a filehandle or a string as input. |
185
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186
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Additional arguments are passed to the parent parser class, but since |
187
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XML::Parser and XML::SAX parsers take options in different formats this is |
188
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of limited use. SVG::Parser does not currently provide any translation of |
189
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parser options. |
190
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191
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See L, L, and L for other ways to |
192
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parse input XML. |
193
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194
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=item * parse_file($filehandle|$filename) |
195
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196
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=item * parsefile($filehandle|$filename) |
197
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198
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Since the parse_file() method (XML::SAX) and parsefile() method (XML::Parser) |
199
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differ in both name and usage, SVG::Parser provides its own version of both |
200
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methods that determines whether the passed argument is a filehandle or |
201
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a file name and directs the call to the appropriate parent parser method. |
202
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203
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Both methods will work equally well whichever parent parser class is in use: |
204
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205
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my $svg=$parser->parse_file($svgxml); |
206
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my $svg=$parser->parsefile($svgxml); |
207
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my $svg=$parser->parse_file(*SVGIN); |
208
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my $svg=$parser->parsefile(*SVGIN); |
209
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...etc... |
210
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211
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(These methods will also work when using SVG::Parser::Expat or SVG::Parser::SAX |
212
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directly.) |
213
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214
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=back |
215
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216
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=head2 EXPORTS |
217
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218
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None. However, a list of preferred parsers can be specified by passing the |
219
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package name to SVG::Parser in the import list. This allows an SVG parser |
220
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application to use the best parser available without knowing what XML parsers |
221
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might be available on the target platform. SAX is generally preferred to Expat, |
222
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but an Expat-based parser may be preferable to the slow Perl-based SAX |
223
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parser XML::SAX::PurePerl. (See L.) |
224
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Each parser specification consists of one of the two supported SVG parsers, |
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SVG::Parser::Expat or SVG::Parser::SAX, optionally followed by an '=' and an |
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explicit parser package. For example: |
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use SVG::Parser qw(SVG::Parser::SAX SVG::Parser::Expat); |
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Instead of specifying the full SVG parser name, 'Expat' and 'SAX' may be used as |
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shorthand. For example: |
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use SVG::Parser qw(SAX Expat); |
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Both the above examples produce the default behaviour. To prefer Expat over SAX |
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use either of: |
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use SVG::Parser qw(SVG::Parser::Expat SVG::Parser::SAX); |
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use SVG::Parser qw(Expat SAX); |
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To use Expat with a specific XML::Parser subclass: |
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use SVG::Parser qw(SVG::Parser::Expat=My::XML::Parser::Subclass); |
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To use SAX with the XML::LibXML SAX parser: |
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use SVG::Parser qw(SVG::Parser::SAX=XML::LibXML::SAX::Parser); |
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A number of specifications can be listed to have SVG::Parse try a number of |
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possible parser alternatives in decreasing order of preference: |
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use SVG::Parser qw( |
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SAX=My::SAXParser |
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Expat=My::Best::ExpatParser |
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SAX=XML::LibXML::SAX::Parser |
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Expat=My::Other::ExpatParser |
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Expat |
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SAX |
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) |
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You can test different scenarios from the command line. For example: |
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perl -MSVG::Parser=SAX mysvgapp.pl |
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perl -MSVG::Parser=Expat,SAX mysvgapp.pl |
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perl -MSVG::Parser=SAX=XML::LibXML::SAX::Parser,Expat mysvgapp.pl |
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To pass additional items in the import list to the parent Expat or SAX parser |
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class, use additional '=' separators in the parser specification. In the case |
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of XML::SAX a minimum version number may be required this way: |
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# require version 1.40+ of the LibXML SAX parser, otherwise use Perl |
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use SVG::Parser qw( |
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SAX=XML::LibXML::SAX::Parser=1.40 |
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SAX=XML::SAX::PurePerl |
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); |
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Similarly, from the command line: |
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perl -MSVG::Parser=SAX=XML::LibXML::SAX::Parser=1.40,SAX=XML::SAX::PurePerl mysvgapp.pl |
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=head2 EXAMPLES |
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See C, C, and C in the examples directory of the |
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distribution, along with C and C for examples of using |
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the SVG::Parser::Expat and SVG::Parser::SAX modules directly. |
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=head1 AUTHOR |
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Peter Wainwright, peter.wainwright@cybrid.net |
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=head1 SEE ALSO |
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L |
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=cut |
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1; |