Class: Alf::Algebra::Rewriter

Inherits:
Object
  • Object
show all
Includes:
Visitor
Defined in:
lib/alf/algebra/support/rewriter.rb

Direct Known Subclasses

Optimizer::Base, Optimizer::Search

Instance Method Summary collapse

Methods included from Visitor

#copy_and_apply

Instance Method Details

#apply(expr, *args, &bl) ⇒ Object

copy all default implementation



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# File 'lib/alf/algebra/support/rewriter.rb', line 14

def apply(expr, *args, &bl)
  send to_method_name(expr, "on_"), expr, *args, &bl
end

#call(expr, search = nil) ⇒ Object

public interface



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# File 'lib/alf/algebra/support/rewriter.rb', line 8

def call(expr, search = nil)
  apply(expr)
end

#not_supported(expr, *args, &bl) ⇒ Object

Raises:



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# File 'lib/alf/algebra/support/rewriter.rb', line 30

def not_supported(expr, *args, &bl)
  raise NotSupportedError, "Unexpected operand `#{expr}`"
end

#on_leaf_operand(expr, *args, &bl) ⇒ Object 



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# File 'lib/alf/algebra/support/rewriter.rb', line 18

def on_leaf_operand(expr, *args, &bl)
  expr
end

#on_missing(expr, *args, &bl) ⇒ Object 



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# File 'lib/alf/algebra/support/rewriter.rb', line 26

def on_missing(expr, *args, &bl)
  copy_and_apply(expr, *args, &bl)
end

#on_shortcut(expr, *args, &bl) ⇒ Object 



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# File 'lib/alf/algebra/support/rewriter.rb', line 22

def on_shortcut(expr, *args, &bl)
  apply(expr.expand, *args, &bl)
end