VERSION
This document describes Attean::API::Expression version 0.017DESCRIPTION
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.
BUGS
Please report any bugs or feature requests to through the GitHub web interface at <https://github.com/kasei/attean/issues>.AUTHOR
Gregory Todd Williams "<[email protected]>"COPYRIGHT
Copyright (c) 2014--2016 Gregory Todd Williams. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.