`class WithParameters`

Represents a constraint on method parameters.

Definitions

`def initialize(parameters)`

Initialize a new WithParameters constraint.

Signature

parameter　parameters　Array(Symbol): List of method parameters in the expected order, must include at least all required parameters but can also list optional parameters.

Implementation

def initialize(parameters)
	@parameters = parameters
end

`def call(assertions, subject)`

Evaluate this constraint against method parameters.

Signature

parameter　assertions　Assertions: The assertions instance to use.
parameter　subject　Array: The method parameters to check.

Implementation

def call(assertions, subject)
	parameters = @parameters.dup
	
	assertions.nested(self) do |assertions|
		subject.each do |type, name|
			expected_name = parameters.shift
			
			case type
			when :req
				assertions.assert(name == expected_name, "parameter #{expected_name} is required, but was #{name}")
			when :opt
				break if expected_name.nil?
				assertions.assert(name == expected_name, "parameter #{expected_name} is specified, but was #{name}")
			else
				break
			end
		end
	end
end