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

Class Method Summary (collapse)

Instance Method Summary (collapse)

Class Method Details

+ (Object) match_value(matcher, block) (private) 



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# File 'lib/algebrick/matching.rb', line 47

def self.match_value(matcher, block)
  if block.kind_of? Proc
    if matcher.kind_of? Matchers::Abstract
      matcher.assigns &block
    else
      block.call
    end
  else
    block
  end
end

Instance Method Details

- (Object) any 



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

def any
  Matchers::Any.new
end

- (Object) match(value, *cases) 



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

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 Matching.match_value matcher, block if matcher === value
  end
  raise "no match for (#{value.class}) '#{value}' by any of #{cases.map(&:first).join ', '}"
end

- (Object) on(matcher, value = nil, &block)

Raises:

  • (ArgumentError) 


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# File 'lib/algebrick/matching.rb', line 35

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