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require 'bel_parser/parsers/ast/node'
module BELParser
module Language
module Semantics
# MultipleSubjectObject implements a {SemanticsFunction} that maps a
# {BELParser::Parsers::AST::Statement} to a {SemanticsWarning} if the
# subject term is referenced as an argument of the object list term.
class MultipleSubjectObject
include SemanticsFunction
private_class_method :new
def self.map(stmt_node, spec, _namespaces)
return nil unless stmt_node.is_a?(BELParser::Parsers::AST::Statement)
return nil if stmt_node.relationship.string_literal.nil?
rel = spec.relationship(stmt_node.relationship.string_literal.to_sym)
return nil unless rel.listable?
list_func = spec.function(:list)
return nil unless list_func
return nil unless stmt_node.object.term?
map_subject_object(stmt_node, rel, spec)
end
def self.map_subject_object(stmt_node, rel, spec)
sub_term = stmt_node.subject.term
list_term = stmt_node.object.child
if list_term.arguments.any? { |arg| sub_term == arg.child }
MultipleSubjectObjectWarning.new(stmt_node, spec, rel)
end
end
end
# Represents a {SemanticsWarning} when a
# {BELParser::Parsers::AST::Statement} includes the subject term as an
# argument of an object list term.
class MultipleSubjectObjectWarning < SemanticsWarning
def initialize(stmt_node, spec, rel)
super(stmt_node, spec)
@rel = rel
end
def to_s
<<-MSG.gsub(/ {12}/, '').delete("\n")
A "#{@rel.long}" statement cannot use the subject term as an
object list() argument.
MSG
end
end
end
end
end
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82 entries across 82 versions & 1 rubygems