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authorLibravatarLibravatar Biswakalyan Bhuyan <biswa@surgot.in> 2022-11-13 23:46:45 +0530
committerLibravatarLibravatar Biswakalyan Bhuyan <biswa@surgot.in> 2022-11-13 23:46:45 +0530
commit9468226a9e2e2ab8cdd599f1d8538e860ca86120 (patch)
tree0a77ada226d6db80639f96b438bf83e4e756edb5 /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')
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diff --git a/env/lib/python3.10/site-packages/setuptools/depends.py b/env/lib/python3.10/site-packages/setuptools/depends.py
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+++ b/env/lib/python3.10/site-packages/setuptools/depends.py
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+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()