Module: DataModel::Scanner

Extended by:
Scanner, T::Sig
Includes:
Logging, Kernel
Included in:
Scanner
Defined in:
lib/data_model/scanner.rb

Defined Under Namespace

Classes: Node

Instance Method Summary collapse

Methods included from Logging

#log

Instance Method Details

#scan(schema, registry = Registry.instance) ⇒ Object 



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# File 'lib/data_model/scanner.rb', line 36

def scan(schema, registry = Registry.instance)
	# state:
	# 	nil (start) -> :type (we have a type) -> :args (we have arguments)
	scanned = Node.new
	state = T.let(nil, T.nilable(Symbol))

	log.debug("scanning schema: #{schema.inspect}")

	for pos in (0...schema.length)
		token = schema[pos]
		dbg = "pos: #{pos}, token: #{token.inspect}, state: #{state.inspect}"
		log.debug(dbg)

		# detect optional args missing
		if !token.is_a?(Hash) && state == :type
			log.debug("detected optional args missing at (#{dbg}), moving state to :args")

			# move state forward
			state = :args
		end

		# we are just collecting params at this point
		if state == :args

			if !token.is_a?(Array) && !token.is_a?(Symbol)
				raise "expected type params at (#{dbg}), which should be either a symbol or an array"
			end

			scanned.params << token
			log.debug("collecting params at (#{dbg})")

			next
		end

		# we can determine meaning based on type and state
		case token
		when Symbol
			if !state.nil?
				raise "got a symbol at(#{dbg}), but validator already defined"
			end

			if !registry.type?(token)
				# TODO: need a much better error here, this is what people see when registration is not there
				raise "expected a type in (#{dbg}), but found #{token.inspect} which is not a registered type"
			end

			scanned.type = token
			state = :type
			log.debug("got a symbol, determined token is a type at (#{dbg}), moving state to :type")

		when Hash
			if state != :type
				raise "got a hash at (#{dbg}), but state is not :type (#{state.inspect})"
			end

			scanned.args = token
			state = :args
			log.debug("got a hash, determined token is args at (#{dbg}), moving state to :args")

		else
			raise "got token #{token.inspect} at (#{dbg}) which was unexpected given the scanner was in a state of #{state}"
		end
	end

	return scanned
end