require 'zlib'

# Module for the main vrobot4 program and global info.
module Vrobot4
   # The current program version.
   Version = "4.01".freeze

   # Sets the current debug level.
   # @param set [Integer] the debug level
   # @return [void]
   def self.set_debug set
      @@debug = set
   end

   # Logs to the console.
   #
   # @param lv [Symbol] the log level
   #  [+:INFO+]   This message will always be printed.
   #  [+:DEBUG+]  This message will not be printed if the global debug level is
   #              less than 1.
   #  [+:DEBUGV+] This message will not be printed if the global debug level is
   #              less than 2.
   # @return [Boolean] true if the message was printed, false otherwise
   def self.log lv, text
      if (lv != :DEBUG  || @@debug >= 1) &&
         (lv != :DEBUGV || @@debug >= 2)
         puts "[#{lv.to_s.ljust 6}] #{text}"
         true
      else
         false
      end
   end

   # Checks if the argument +s+ is a numeric string.
   # @param s [String] the string to check
   # @return [Boolean] true if +s+ is a numeric string, false otherwise
   def self.is_num? s
      /\A[-+]?[0-9]*\.?[0-9]+\Z/ === s
   end

   # Does a stable hash on +s+.
   # @param s [String] the string to hash
   # @return [Integer]
   def self.hash_str s
      Zlib.crc32 s
   end
end

## EOF