note
	description: "Summary description for {ITP_VARIABLE_CONSTANTS}."
	author: ""
	date: "$Date$"
	revision: "$Revision$"

class
	ITP_VARIABLE_CONSTANTS

inherit
	ITP_SHARED_CONSTANTS

feature -- Access

	variable_index (a_name: STRING; a_prefix: STRING): INTEGER
			-- Variable index from `a_name', assuming that `a_name' has the following format:
			-- `a_prefix'index. For example, if `a_prefix' is "v_", then "v_1" will be a valid name,
			-- and "1" will be the returned index.
		require
			a_name_attached: a_name /= Void
			not_a_name_is_empty: not a_name.is_empty
			a_prefix_attached: a_prefix /= Void
			not_a_prefix_is_empty: not a_prefix.is_empty
			a_prefix_valid: a_name.count > a_prefix.count
			a_name_valid: a_name.substring (a_prefix.count + 1, a_name.count).is_integer
		do
			Result := a_name.substring (a_prefix.count + 1, a_name.count).to_integer
		ensure
			result_positive: Result > 0
		end

note
	copyright: "Copyright (c) 1984-2010, Eiffel Software"
	license: "GPL version 2 (see http://www.eiffel.com/licensing/gpl.txt)"
	licensing_options: "http://www.eiffel.com/licensing"
	copying: "[
			This file is part of Eiffel Software's Eiffel Development Environment.
			
			Eiffel Software's Eiffel Development Environment is free
			software; you can redistribute it and/or modify it under
			the terms of the GNU General Public License as published
			by the Free Software Foundation, version 2 of the License
			(available at the URL listed under "license" above).
			
			Eiffel Software's Eiffel Development Environment is
			distributed in the hope that it will be useful, but
			WITHOUT ANY WARRANTY; without even the implied warranty
			of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
			See the GNU General Public License for more details.
			
			You should have received a copy of the GNU General Public
			License along with Eiffel Software's Eiffel Development
			Environment; if not, write to the Free Software Foundation,
			Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
		]"
	source: "[
			Eiffel Software
			5949 Hollister Ave., Goleta, CA 93117 USA
			Telephone 805-685-1006, Fax 805-685-6869
			Website http://www.eiffel.com
			Customer support http://support.eiffel.com
		]"
end