CSS::SAC::LexicalUnit - SAC units
use CSS::SAC::LexicalUnit qw(:constants);
foo if $lu->is_type(LU_TYPE_CONSTANT);
In the SAC spec, LexicalUnit is a linked list, that is, you only ever hold one LexicalUnit, and you ask for the next of for the previous one when you want to move on.
Such a model seems awkward, though I'm sure it makes sense somehow in Java, likely for a Java-specific reason.
In the Perl implementation, I have changed this. A LexicalUnit is an object that stands on it's own and has no next/previous objects. Instead, the $handler->property callback gets called with a LexicalUnitList, which is in fact just an array ref of LexicalUnits.
We also don't differentiate between IntegerValue, FloatValue, and StringValue, it's always Value in Perl. This also applies to Parameters and SubValues. Both are called as Value and return an array ref of LexicalUnits.
I added the is_type() method, see CSS::SAC::Condition for advantages of that approach.
CSS::SAC::LexicalUnit->new($type,$text,$value) or $lu->new($type,$text,$value)
Creates a new unit. The $type must be one of the type constants, the text depends on the type of unit (unit text, func name, etc...), and the value is the content of the lu.
$lu->DimensionUnitText([$dut]) or getDimensionUnitText
get/set the text of the dimension unit (eg cm, px, etc...)
$lu->FunctionName([$fn]) or getFunctionName
get/set the name of the function (eg attr, uri, etc...)
$lu->Value([$value]) or getValue
get/set the value of the lu (which may be another lu, or a lu list)
$lu->LexicalUnitType([$type]) or getLexicalUnitType
get/set the type of the lu
returns true is this lu is of type $lu_constant
Robin Berjon <firstname.lastname@example.org>
This module is licensed under the same terms as Perl itself.
To install CSS::SAC, copy and paste the appropriate command in to your terminal.
perl -MCPAN -e shell
For more information on module installation, please visit the detailed CPAN module installation guide.