NAME¶
Attean::API::Expression - SPARQL expressions
VERSION¶
This document describes Attean::API::Expression version 0.021
DESCRIPTION¶
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.
ROLES¶
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"
ATTRIBUTES¶
The following attributes exist:
- "operator"
- A string indicating the expression operator (e.g.
'+' or '||').
REQUIRED METHODS¶
The following methods are required by the Attean::API::Expression role:
- "as_string"
- Returns a string serialization of the expression object.
AUTHOR¶
Gregory Todd Williams
"<gwilliams@cpan.org>"
COPYRIGHT¶
Copyright (c) 2014--2018 Gregory Todd Williams. This program is free software;
you can redistribute it and/or modify it under the same terms as Perl itself.
