def get_source_scanner(self, node):
        """Fetch the source scanner for the specified node

        NOTE:  "self" is the target being built, "node" is
        the source file for which we want to fetch the scanner.

        Implies self.has_builder() is true; again, expect to only be
        called from locations where this is already verified.

        This function may be called very often; it attempts to cache
        the scanner found to improve performance.
        """
        scanner = None
        try:
            scanner = self.builder.source_scanner
        except __HOLE__:
            pass
        if not scanner:
            # The builder didn't have an explicit scanner, so go look up
            # a scanner from env['SCANNERS'] based on the node's scanner
            # key (usually the file extension).
            scanner = self.get_env_scanner(self.get_build_env())
        if scanner:
            scanner = scanner.select(node)
        return scanner
dataset/ETHPy150Open kayhayen/Nuitka/nuitka/build/inline_copy/lib/scons-2.3.2/SCons/Node/__init__.py/Node.get_source_scanner