| import os |
| import warnings |
|
|
| class YAJLImportError(ImportError): |
| pass |
|
|
|
|
| def require_version(version, required): |
| ''' |
| Asserts that the major component of 'version' is equal to 'required'. |
| Raises YAJLImportError otherwise. |
| ''' |
| major, rest = divmod(version, 10000) |
| minor, micro = divmod(rest, 100) |
| if major != required: |
| raise YAJLImportError('YAJL version %s.x required, found %s.%s.%s' % (required, major, minor, micro)) |
|
|
| def get_yajl_version(yajl): |
| try: |
| return yajl.yajl_version() |
| except AttributeError: |
| warnings.warn('Cannot determine yajl version, assuming <1.0.12') |
| return 10000 |
|
|
| def find_yajl_ctypes(required): |
| ''' |
| Finds and loads yajl shared object of the required major |
| version (1, 2, ...) using ctypes. |
| ''' |
| |
| |
| |
| from ctypes import util, cdll |
|
|
| so_name = os.getenv('YAJL_DLL') or util.find_library('yajl') |
| if so_name is None: |
| raise YAJLImportError('YAJL shared object not found.') |
| try: |
| yajl = cdll.LoadLibrary(so_name) |
| except OSError: |
| raise YAJLImportError('Unable to load YAJL.') |
| require_version(get_yajl_version(yajl), required) |
| return yajl |
|
|
| def find_yajl_cffi(ffi, required): |
| ''' |
| Finds and loads yajl shared object of the required major |
| version (1, 2, ...) using cffi. |
| ''' |
| try: |
| yajl = ffi.dlopen(os.getenv('YAJL_DLL') or 'yajl') |
| except OSError: |
| raise YAJLImportError('Unable to load YAJL.') |
| require_version(get_yajl_version(yajl), required) |
| return yajl |
|
|
