Attean::API::Expression - SPARQL expressions
This document describes Attean::API::Expression version 0.027
The Attean::API::Expression role defines a common API for SPARQL expressions consisting of logical, numeric, and function operators, constant terms, and variables. Expressions may be evaluated in the context of a Attean::API::Result object, and either return a Attean::API::Term object or throw a type error exception.
This role consumes the Attean::API::DirectedAcyclicGraph role which provide the following methods:
is_leaf
walk( prefix => \&pre_cb, postfix => \&pre_cb )
cover( prefix => \&pre_cb, postfix => \&pre_cb )
and the following attributes:
children
The following attributes exist:
operator
A string indicating the expression operator (e.g. '+' or '||').
'+'
'||'
The following methods are required by the Attean::API::Expression role:
as_string
Returns a string serialization of the expression object.
Please report any bugs or feature requests to through the GitHub web interface at https://github.com/kasei/attean/issues.
Gregory Todd Williams <gwilliams@cpan.org>
<gwilliams@cpan.org>
Copyright (c) 2014--2020 Gregory Todd Williams. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
To install Attean, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Attean
CPAN shell
perl -MCPAN -e shell install Attean
For more information on module installation, please visit the detailed CPAN module installation guide.