def validate_pfunctions()

in functions/source/KeyGen/pycparser/ply/yacc.py [0:0]

• 49 lines of code
• 25 McCabe index (conditional complexity)

    def validate_pfunctions(self):
        grammar = []
        # Check for non-empty symbols
        if len(self.pfuncs) == 0:
            self.log.error('no rules of the form p_rulename are defined')
            self.error = True
            return

        for line, module, name, doc in self.pfuncs:
            file = inspect.getsourcefile(module)
            func = self.pdict[name]
            if isinstance(func, types.MethodType):
                reqargs = 2
            else:
                reqargs = 1
            if func.__code__.co_argcount > reqargs:
                self.log.error('%s:%d: Rule %r has too many arguments', file, line, func.__name__)
                self.error = True
            elif func.__code__.co_argcount < reqargs:
                self.log.error('%s:%d: Rule %r requires an argument', file, line, func.__name__)
                self.error = True
            elif not func.__doc__:
                self.log.warning('%s:%d: No documentation string specified in function %r (ignored)',
                                 file, line, func.__name__)
            else:
                try:
                    parsed_g = parse_grammar(doc, file, line)
                    for g in parsed_g:
                        grammar.append((name, g))
                except SyntaxError as e:
                    self.log.error(str(e))
                    self.error = True

                # Looks like a valid grammar rule
                # Mark the file in which defined.
                self.modules.add(module)

        # Secondary validation step that looks for p_ definitions that are not functions
        # or functions that look like they might be grammar rules.

        for n, v in self.pdict.items():
            if n.startswith('p_') and isinstance(v, (types.FunctionType, types.MethodType)):
                continue
            if n.startswith('t_'):
                continue
            if n.startswith('p_') and n != 'p_error':
                self.log.warning('%r not defined as a function', n)
            if ((isinstance(v, types.FunctionType) and v.__code__.co_argcount == 1) or
                   (isinstance(v, types.MethodType) and v.__func__.__code__.co_argcount == 2)):
                if v.__doc__:
                    try:
                        doc = v.__doc__.split(' ')
                        if doc[1] == ':':
                            self.log.warning('%s:%d: Possible grammar rule %r defined without p_ prefix',
                                             v.__code__.co_filename, v.__code__.co_firstlineno, n)
                    except IndexError:
                        pass

        self.grammar = grammar