Class: ScopedSearch::QueryLanguage::AST::OperatorNode

Inherits:

Node

• Object
• Node
• ScopedSearch::QueryLanguage::AST::OperatorNode

show all

Defined in:

lib/scoped_search/query_language/ast.rb

Overview

Instance Attribute Summary (collapse)

• - (Object) children readonly

  Returns the value of attribute children.

• - (Object) operator readonly

  Returns the value of attribute operator.

Instance Method Summary (collapse)

• - (Object) [](child_nr)

  Returns a child node by index, starting with 0.

• - (Boolean) eql?(node)

  :nodoc.

• - (Boolean) infix?

  Returns true if this is an infix operator.

• - (OperatorNode) initialize(operator, children) constructor

  :nodoc.

• - (Object) lhs

  Return the left-hand side (LHS) operand for this operator.

• - (Boolean) prefix?

  Returns true if this is a prefix operator.

• - (Object) rhs

  Return the right-hand side (RHS) operand for this operator.

• - (Object) simplify

  Tree simplicication: returns itself after simpifying its children.

• - (Object) to_a

  Return an array representation for the node.

Methods inherited from Node

#compatible_with, #inspect

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# File 'lib/scoped_search/query_language/ast.rb', line 67

def initialize(operator, children) # :nodoc
  @operator = operator
  @children = children
end

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# File 'lib/scoped_search/query_language/ast.rb', line 65

def children
  @children
end

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# File 'lib/scoped_search/query_language/ast.rb', line 64

def operator
  @operator
end

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# File 'lib/scoped_search/query_language/ast.rb', line 111

def [](child_nr)
  children[child_nr]
end

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# File 'lib/scoped_search/query_language/ast.rb', line 83

def eql?(node) # :nodoc
  node.kind_of?(OperatorNode) && node.operator == operator && node.children.eql?(children)
end

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# File 'lib/scoped_search/query_language/ast.rb', line 101

def infix?
  children.length > 1
end

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# File 'lib/scoped_search/query_language/ast.rb', line 88

def lhs
  raise ScopedSearch::Exception, "Operator does not have a LHS" if prefix?
  raise ScopedSearch::Exception, "Operators with more than 2 children do not have LHS/RHS" if children.length > 2
  children[0]
end

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# File 'lib/scoped_search/query_language/ast.rb', line 106

def prefix?
  children.length == 1
end

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# File 'lib/scoped_search/query_language/ast.rb', line 95

def rhs
  raise ScopedSearch::Exception, "Operators with more than 2 children do not have LHS/RHS" if children.length > 2
  children.length == 1 ? children[0] : children[1]
end

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# File 'lib/scoped_search/query_language/ast.rb', line 73

def simplify
  @children = children.map { |c| c.simplify }
  return self
end

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# File 'lib/scoped_search/query_language/ast.rb', line 79

def to_a
  [@operator] + @children.map { |c| c.to_a }
end