'Parse <stdio> element(s) and fill in self.return_codes,
self.stderr_rules, and self.stdout_rules. Return codes have a range
and an error type (fault or warning).  Stderr and stdout rules have
a regular expression and an error level (fault or warning).'

def parse_stdio(self, tool_source):

    (exit_codes, regexes) = tool_source.parse_stdio()
    self.stdio_exit_codes = exit_codes
    self.stdio_regexes = regexes
