Module: Algebrick::Matching

Included in:
Algebrick, Algebrick, Type, Value
Defined in:
lib/algebrick/matching.rb

Overview

include this module anywhere yoy need to use pattern matching

Instance Method Summary collapse

Instance Method Details

#any ⇒ Object 



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# File 'lib/algebrick/matching.rb', line 18

def any
  Matchers::Any.new
end

#match(value, *cases) ⇒ Object 



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# File 'lib/algebrick/matching.rb', line 22

def match(value, *cases)
  success, result = match? value, *cases
  raise "no match for (#{value.class}) '#{value}' by any of #{cases.map(&:first).join ', '}" unless success
  result
end

#match?(value, *cases) ⇒ Boolean

Returns:



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# File 'lib/algebrick/matching.rb', line 28

def match?(value, *cases)
  cases = if cases.size == 1 && cases.first.is_a?(Hash)
            cases.first
          else
            cases
          end

  cases.each do |matcher, block|
    return true, Matching.match_value(matcher, block) if matcher === value
  end
  [false, nil]
end

#on(matcher, value = nil, &block) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/algebrick/matching.rb', line 41

def on(matcher, value = nil, &block)
  matcher = if matcher.is_a? Matchers::Abstract
              matcher
            else
              matcher.to_m
            end
  raise ArgumentError, 'only one of block or value can be supplied' if block && value
  [matcher, value || block]
end