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author | Biswakalyan Bhuyan <biswa@surgot.in> | 2022-11-13 23:46:45 +0530 |
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committer | Biswakalyan Bhuyan <biswa@surgot.in> | 2022-11-13 23:46:45 +0530 |
commit | 9468226a9e2e2ab8cdd599f1d8538e860ca86120 (patch) | |
tree | 0a77ada226d6db80639f96b438bf83e4e756edb5 /env/lib/python3.10/site-packages/setuptools/depends.py | |
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Diffstat (limited to 'env/lib/python3.10/site-packages/setuptools/depends.py')
-rw-r--r-- | env/lib/python3.10/site-packages/setuptools/depends.py | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/env/lib/python3.10/site-packages/setuptools/depends.py b/env/lib/python3.10/site-packages/setuptools/depends.py new file mode 100644 index 0000000..adffd12 --- /dev/null +++ b/env/lib/python3.10/site-packages/setuptools/depends.py @@ -0,0 +1,176 @@ +import sys +import marshal +import contextlib +import dis + +from setuptools.extern.packaging import version + +from ._imp import find_module, PY_COMPILED, PY_FROZEN, PY_SOURCE +from . import _imp + + +__all__ = [ + 'Require', 'find_module', 'get_module_constant', 'extract_constant' +] + + +class Require: + """A prerequisite to building or installing a distribution""" + + def __init__( + self, name, requested_version, module, homepage='', + attribute=None, format=None): + + if format is None and requested_version is not None: + format = version.Version + + if format is not None: + requested_version = format(requested_version) + if attribute is None: + attribute = '__version__' + + self.__dict__.update(locals()) + del self.self + + def full_name(self): + """Return full package/distribution name, w/version""" + if self.requested_version is not None: + return '%s-%s' % (self.name, self.requested_version) + return self.name + + def version_ok(self, version): + """Is 'version' sufficiently up-to-date?""" + return self.attribute is None or self.format is None or \ + str(version) != "unknown" and self.format(version) >= self.requested_version + + def get_version(self, paths=None, default="unknown"): + """Get version number of installed module, 'None', or 'default' + + Search 'paths' for module. If not found, return 'None'. If found, + return the extracted version attribute, or 'default' if no version + attribute was specified, or the value cannot be determined without + importing the module. The version is formatted according to the + requirement's version format (if any), unless it is 'None' or the + supplied 'default'. + """ + + if self.attribute is None: + try: + f, p, i = find_module(self.module, paths) + if f: + f.close() + return default + except ImportError: + return None + + v = get_module_constant(self.module, self.attribute, default, paths) + + if v is not None and v is not default and self.format is not None: + return self.format(v) + + return v + + def is_present(self, paths=None): + """Return true if dependency is present on 'paths'""" + return self.get_version(paths) is not None + + def is_current(self, paths=None): + """Return true if dependency is present and up-to-date on 'paths'""" + version = self.get_version(paths) + if version is None: + return False + return self.version_ok(str(version)) + + +def maybe_close(f): + @contextlib.contextmanager + def empty(): + yield + return + if not f: + return empty() + + return contextlib.closing(f) + + +def get_module_constant(module, symbol, default=-1, paths=None): + """Find 'module' by searching 'paths', and extract 'symbol' + + Return 'None' if 'module' does not exist on 'paths', or it does not define + 'symbol'. If the module defines 'symbol' as a constant, return the + constant. Otherwise, return 'default'.""" + + try: + f, path, (suffix, mode, kind) = info = find_module(module, paths) + except ImportError: + # Module doesn't exist + return None + + with maybe_close(f): + if kind == PY_COMPILED: + f.read(8) # skip magic & date + code = marshal.load(f) + elif kind == PY_FROZEN: + code = _imp.get_frozen_object(module, paths) + elif kind == PY_SOURCE: + code = compile(f.read(), path, 'exec') + else: + # Not something we can parse; we'll have to import it. :( + imported = _imp.get_module(module, paths, info) + return getattr(imported, symbol, None) + + return extract_constant(code, symbol, default) + + +def extract_constant(code, symbol, default=-1): + """Extract the constant value of 'symbol' from 'code' + + If the name 'symbol' is bound to a constant value by the Python code + object 'code', return that value. If 'symbol' is bound to an expression, + return 'default'. Otherwise, return 'None'. + + Return value is based on the first assignment to 'symbol'. 'symbol' must + be a global, or at least a non-"fast" local in the code block. That is, + only 'STORE_NAME' and 'STORE_GLOBAL' opcodes are checked, and 'symbol' + must be present in 'code.co_names'. + """ + if symbol not in code.co_names: + # name's not there, can't possibly be an assignment + return None + + name_idx = list(code.co_names).index(symbol) + + STORE_NAME = 90 + STORE_GLOBAL = 97 + LOAD_CONST = 100 + + const = default + + for byte_code in dis.Bytecode(code): + op = byte_code.opcode + arg = byte_code.arg + + if op == LOAD_CONST: + const = code.co_consts[arg] + elif arg == name_idx and (op == STORE_NAME or op == STORE_GLOBAL): + return const + else: + const = default + + +def _update_globals(): + """ + Patch the globals to remove the objects not available on some platforms. + + XXX it'd be better to test assertions about bytecode instead. + """ + + if not sys.platform.startswith('java') and sys.platform != 'cli': + return + incompatible = 'extract_constant', 'get_module_constant' + for name in incompatible: + del globals()[name] + __all__.remove(name) + + +_update_globals() |