Class: Dry::Logic::RuleCompiler

Inherits:
Object
  • Object
show all
Defined in:
lib/dry/logic/rule_compiler.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(predicates) ⇒ RuleCompiler

Returns a new instance of RuleCompiler.



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# File 'lib/dry/logic/rule_compiler.rb', line 8

def initialize(predicates)
  @predicates = predicates
end

Instance Attribute Details

#predicates ⇒ Object (readonly)

Returns the value of attribute predicates.



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# File 'lib/dry/logic/rule_compiler.rb', line 6

def predicates
  @predicates
end

Instance Method Details

#call(ast) ⇒ Object 



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# File 'lib/dry/logic/rule_compiler.rb', line 12

def call(ast)
  ast.map { |node| visit(node) }
end

#visit(node) ⇒ Object 



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# File 'lib/dry/logic/rule_compiler.rb', line 16

def visit(node)
  name, nodes = node
  send(:"visit_#{name}", nodes)
end

#visit_and(node) ⇒ Object 



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# File 'lib/dry/logic/rule_compiler.rb', line 60

def visit_and(node)
  left, right = node
  visit(left).and(visit(right))
end

#visit_attr(node) ⇒ Object 



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# File 'lib/dry/logic/rule_compiler.rb', line 35

def visit_attr(node)
  name, predicate = node
  Operations::Attr.new(visit(predicate), name: name)
end

#visit_check(node) ⇒ Object 



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# File 'lib/dry/logic/rule_compiler.rb', line 21

def visit_check(node)
  keys, predicate = node
  Operations::Check.new(visit(predicate), keys: keys)
end

#visit_each(node) ⇒ Object 



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# File 'lib/dry/logic/rule_compiler.rb', line 44

def visit_each(node)
  Operations::Each.new(visit(node))
end

#visit_implication(node) ⇒ Object 



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# File 'lib/dry/logic/rule_compiler.rb', line 75

def visit_implication(node)
  left, right = node
  visit(left).then(visit(right))
end

#visit_key(node) ⇒ Object 



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# File 'lib/dry/logic/rule_compiler.rb', line 30

def visit_key(node)
  name, predicate = node
  Operations::Key.new(visit(predicate), name: name)
end

#visit_not(node) ⇒ Object 



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# File 'lib/dry/logic/rule_compiler.rb', line 26

def visit_not(node)
  Operations::Negation.new(visit(node))
end

#visit_or(node) ⇒ Object 



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# File 'lib/dry/logic/rule_compiler.rb', line 65

def visit_or(node)
  left, right = node
  visit(left).or(visit(right))
end

#visit_predicate(node) ⇒ Object 



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# File 'lib/dry/logic/rule_compiler.rb', line 48

def visit_predicate(node)
  name, params = node
  predicate = Rule::Predicate.build(predicates[name])

  if params.size > 1
    args = params.map(&:last).reject { |val| val == Undefined }
    predicate.curry(*args)
  else
    predicate
  end
end

#visit_set(node) ⇒ Object 



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# File 'lib/dry/logic/rule_compiler.rb', line 40

def visit_set(node)
  Operations::Set.new(*call(node))
end

#visit_xor(node) ⇒ Object 



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# File 'lib/dry/logic/rule_compiler.rb', line 70

def visit_xor(node)
  left, right = node
  visit(left).xor(visit(right))
end