Method: Filigree::Visitor#visit

Defined in:
lib/filigree/visitor.rb

#visit(*objects) ⇒ Object, MatchError

Find the correct pattern and execute its block on the provided objects.

Parameters:

  • objects (Object) —

    Objects to pattern match.

Returns:

  • (Object, MatchError) —

    Result of calling the matched pattern’s block or MatchError if nothing was found

Raises:

  • (MatchError) —

    Raised when no matching pattern is found and strict matching is enabled.



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# File 'lib/filigree/visitor.rb', line 39

def visit(*objects)
  # FIXME: A dirty hack.  Find a better place to initialize this.
  @match_bindings ||= Array.new

  @match_bindings.push OpenStruct.new

  self.class.patterns.each do |pattern|

    # FIXME: Make these take their arguments in the same order
    if pattern.match?(objects, self)
      result = pattern.(self, objects)
      @match_bindings.pop
      return result
    end
  end

  @match_bindings.pop

  if self.class.strict_match?
    # If we didn't find anything we raise a MatchError.
    raise MatchError
  else
    MatchError
  end
end