# Detects the `pkgconfig` annotation on the module declaration only
private class PkgconfigPhase
	super Phase

	redef fun process_annotated_node(nmoduledecl, nat)
	do
		# Skip if we are not interested
		if nat.name != "pkgconfig" then return

		# Do some validity checks and print errors if the annotation is used incorrectly
		var modelbuilder = toolcontext.modelbuilder

		if not nmoduledecl isa AModuledecl then
			modelbuilder.error(nat, "Syntax Error: only the declaration of modules may use `pkgconfig`.")
			return
		end

		# retrieve module
		var nmodule = nmoduledecl.parent.as(AModule)
		var mmodule = nmodule.mmodule.as(not null)

		# target pkgs
		var pkgs = new Array[String]

		var args = nat.n_args
		if args.is_empty then
			# use module name
			pkgs.add(mmodule.name)
		else
			for arg in args do
				var pkg = arg.as_string
				if pkg == null then
					modelbuilder.error(nat, "Syntax Error: `pkgconfig` expects its arguments to be the name of the package as String literals.")
					return
				end

				pkgs.add(pkg)
			end
		end

		for pkg in pkgs do
			mmodule.pkgconfigs.add pkg
		end
	end
end