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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" XML::PatAct::ToObjects \- An action module for creating Perl objects .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& use XML::PatAct::ToObjects; \& \& my $patterns = [ PATTERN => [ OPTIONS ], \& PATTERN => "PERL\-CODE", \& ... ]; \& \& my $matcher = XML::PatAct::ToObjects\->new( Patterns => $patterns, \& Matcher => $matcher, \& CopyId => 1, \& CopyAttributes => 1 ); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" XML::PatAct::ToObjects is a PerlSAX handler for applying pattern-action lists to \s-1XML\s0 parses or trees. XML::PatAct::ToObjects creates Perl objects of the types and contents of the action items you define. .PP New XML::PatAct::ToObject instances are creating by calling `\fInew()\fR'. Parameters can be passed as a list of key, value pairs or a hash. `\fInew()\fR' requires the Patterns and Matcher parameters, the rest are optional: .IP "Patterns" 4 .IX Item "Patterns" The pattern-action list to apply. .IP "Matcher" 4 .IX Item "Matcher" An instance of the pattern or query matching module. .IP "CopyId" 4 .IX Item "CopyId" Causes the `\s-1ID\s0' attribute, if any, in a source \s-1XML\s0 element to be copied to an `\s-1ID\s0' attribute in newly created objects. Note that IDs may be lost of no pattern matches that element or an object is not created (\f(CW\*(C`\-make\*(C'\fR) for that element. .IP "CopyAttributes" 4 .IX Item "CopyAttributes" Causes all attributes of the element to be copied to the newly created objects. .PP Each action can either be a list of options defined below or a string containing a fragment of Perl code. If the action is a string of Perl code then simple then some simple substitutions are made as described further below. .PP Options that can be used in an action item containing an option-list: .IP "\fB\-holder\fR" 4 .IX Item "-holder" Ignore this element, but continue processing it's children (compare to \&\fB\-ignore\fR). \f(CW\*(C`\-pcdata\*(C'\fR may be used with this option. .IP "\fB\-ignore\fR" 4 .IX Item "-ignore" Ignore (discard) this element and it's children (compare to \fB\-holder\fR). .IP "\fB\-pcdata\fR" 4 .IX Item "-pcdata" Character data in this element should be copied to the \f(CW\*(C`Contents\*(C'\fR field. .IP "\fB\-make\fR \fI\s-1PACKAGE\s0\fR" 4 .IX Item "-make PACKAGE" Create an object blessed into \fI\s-1PACKAGE\s0\fR, and continue processing this element and it's children. \fI\s-1PACKAGE\s0\fR may be the type `\f(CW\*(C`HASH\*(C'\fR' to simply create an anonyous hash. .IP "\fB\-args\fR \fI\s-1ARGUMENTS\s0\fR" 4 .IX Item "-args ARGUMENTS" Use \fI\s-1ARGUMENTS\s0\fR in creating the object specified by \fB\-make\fR. This is commonly used to copy element attributes into fields in the newly created object. For example: .Sp .Vb 1 \& \-make => \*(AqHASH\*(Aq, \-args => \*(AqURL => %{href}\*(Aq .Ve .Sp would copy the `\f(CW\*(C`href\*(C'\fR' attribute in an element to the `\f(CW\*(C`URL\*(C'\fR' field of the newly created hash. .IP "\fB\-field\fR \fI\s-1FIELD\s0\fR" 4 .IX Item "-field FIELD" Store this element, object, or children of this element in the parent object's field named by \fI\s-1FIELD\s0\fR. .IP "\fB\-push\-field\fR \fI\s-1FIELD\s0\fR" 4 .IX Item "-push-field FIELD" Similar to \fB\-field\fR, except that \fI\s-1FIELD\s0\fR is an array and the contents are pushed onto that array. .IP "\fB\-value\fR \fI\s-1VALUE\s0\fR" 4 .IX Item "-value VALUE" Use \fI\s-1VALUE\s0\fR as a literal value to store in \fI\s-1FIELD\s0\fR, otherwise ignoring this element and it's children. Only valid with \fB\-field\fR or \&\fB\-push\-field\fR. `\f(CW\*(C`%{\f(CIATTRIBUTE\f(CW}\*(C'\fR' notation can be used to substitute the value of an attribute into the literal value. .IP "\fB\-as\-string\fR" 4 .IX Item "-as-string" Convert the contents of this element to a string (as in \&\f(CW\*(C`XML::Grove::AsString\*(C'\fR) and store in \fI\s-1FIELD\s0\fR. Only valid with \&\fB\-field\fR or \fB\-push\-field\fR. .IP "\fB\-grove\fR" 4 .IX Item "-grove" Copy this element to \fI\s-1FIELD\s0\fR without further processing. The element can then be processed later as the Perl objects are manipulated. Only valid with \fB\-field\fR or \fB\-push\-field\fR. If ToObjects is used with PerlSAX, this will use XML::Grove::Builder to build the grove element. .IP "\fB\-grove\-contents\fR" 4 .IX Item "-grove-contents" Used with \fB\-make\fR, \fB\-grove\-contents\fR creates an object but then takes all of the content of that element and stores it in Contents. .PP If an action item is a string, that string is treated as a fragment of Perl code. The following simple substitutions are performed on the fragment to provide easy access to the information being converted: .ie n .IP "\fB\fB@ELEM\fB@\fR" 4 .el .IP "\fB\f(CB@ELEM\fB@\fR" 4 .IX Item "@ELEM@" The object that caused this action to be called. If ToObjects is used with PerlSAX this will be a hash with the element name and attributes, with XML::Grove this will be the element object, with Data::Grove it will be the matching object, and with \s-1XML::DOM\s0 it will be an XML::DOM::Element. .SH "EXAMPLE" .IX Header "EXAMPLE" The example pattern-action list below will convert the following \s-1XML\s0 representing a Database schema: .PP .Vb 10 \& \& \& MyTable \& A short summary \& A long description that may \& contain a subset of HTML \& \& MyColumn1 \& A short summary \& A long description \& \& \& 42 \& \&
\& .Ve .PP into Perl objects looking like: .PP .Vb 10 \& [ \& { Name => "MyTable", \& Summary => "A short summary", \& Description => $grove_object, \& Columns => [ \& { Name => "MyColumn1", \& Summary => "A short summary", \& Description => $grove_object, \& Unique => 1, \& NonNull => 1, \& Default => 42 \& } \& ] \& } \& ] .Ve .PP Here is a Perl script and pattern-action list that will perform the conversion using the simple name matching pattern module XML::PatAct::MatchName. The script accepts a Schema \s-1XML\s0 file as an argument (\f(CW$ARGV[0]\fR) to the script. This script creates a grove as one of it's objects, so it requires the XML::Grove module. .PP .Vb 3 \& use XML::Parser::PerlSAX; \& use XML::PatAct::MatchName; \& use XML::PatAct::ToObjects; \& \& my $patterns = [ \& \*(Aqschema\*(Aq => [ qw{ \-holder } ], \& \*(Aqtable\*(Aq => [ qw{ \-make Schema::Table } ], \& \*(Aqname\*(Aq => [ qw{ \-field Name \-as\-string } ], \& \*(Aqsummary\*(Aq => [ qw{ \-field Summary \-as\-string } ], \& \*(Aqdescription\*(Aq => [ qw{ \-field Description \-grove } ], \& \*(Aqcolumn\*(Aq => [ qw{ \-make Schema::Column \-push\-field Columns } ], \& \*(Aqunique\*(Aq => [ qw{ \-field Unique \-value 1 } ], \& \*(Aqnon\-null\*(Aq => [ qw{ \-field NonNull \-value 1 } ], \& \*(Aqdefault\*(Aq => [ qw{ \-field Default \-as\-string } ], \& ]; \& \& my $matcher = XML::PatAct::MatchName\->new( Patterns => $patterns ); \& my $handler = XML::PatAct::ToObjects\->new( Patterns => $patterns, \& Matcher => $matcher); \& \& my $parser = XML::Parser::PerlSAX\->new( Handler => $handler ); \& my $schema = $parser\->parse(Source => { SystemId => $ARGV[0] } ); .Ve .SH "TODO" .IX Header "TODO" .IP "\(bu" 4 It'd be nice if patterns could be applied even in \fB\-as\-string\fR and \&\fB\-grove\fR. .IP "\(bu" 4 Implement Perl code actions. .IP "\(bu" 4 \&\fB\-as\-xml\fR to write \s-1XML\s0 into the field. .SH "AUTHOR" .IX Header "AUTHOR" Ken MacLeod, ken@bitsko.slc.ut.us .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fIperl\fR\|(1), \fIData::Grove\fR\|(3) .PP ``Using PatAct Modules'' and ``Creating PatAct Modules'' in libxml-perl.