Class ScopedSearch::QueryLanguage::AST::LogicalOperatorNode
In: lib/scoped_search/query_language/ast.rb
Parent: OperatorNode

AST class for representing AND or OR constructs. Logical constructs can be simplified resulting in a less complex AST.

Methods

compatible_with   simplify  

Public Instance methods

compatible_with(node)

Checks whether another node is comparable so that it can be used for tree simplification. A node can only be simplified if the logical operator is equal.

[Source]

     # File lib/scoped_search/query_language/ast.rb, line 123
123:     def compatible_with(node)
124:       node.kind_of?(LogicalOperatorNode) && node.operator == self.operator
125:     end
simplify()

Simplifies nested AND and OR constructs to single constructs with multiple arguments: e.g. (a AND (b AND c)) -> (a AND b AND c)

[Source]

     # File lib/scoped_search/query_language/ast.rb, line 129
129:     def simplify
130:       if children.length == 1
131:         # AND or OR constructs do nothing if they only have one operand
132:         # So remove the logal operator from the AST by simply using the opeand
133:         return children.first.simplify
134:       else
135:         # nested AND or OR constructs can be combined into one construct
136:         @children = children.map { |c| c.simplify }.map { |c| self.compatible_with(c) ? c.children : c }.flatten
137:         return self
138:       end
139:     end

[Validate]