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comparison planemo/lib/python3.7/site-packages/setuptools/depends.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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0:d30785e31577 1:56ad4e20f292
1 import sys
2 import imp
3 import marshal
4 from distutils.version import StrictVersion
5 from imp import PKG_DIRECTORY, PY_COMPILED, PY_SOURCE, PY_FROZEN
6
7 from .py33compat import Bytecode
8
9
10 __all__ = [
11 'Require', 'find_module', 'get_module_constant', 'extract_constant'
12 ]
13
14
15 class Require:
16 """A prerequisite to building or installing a distribution"""
17
18 def __init__(self, name, requested_version, module, homepage='',
19 attribute=None, format=None):
20
21 if format is None and requested_version is not None:
22 format = StrictVersion
23
24 if format is not None:
25 requested_version = format(requested_version)
26 if attribute is None:
27 attribute = '__version__'
28
29 self.__dict__.update(locals())
30 del self.self
31
32 def full_name(self):
33 """Return full package/distribution name, w/version"""
34 if self.requested_version is not None:
35 return '%s-%s' % (self.name, self.requested_version)
36 return self.name
37
38 def version_ok(self, version):
39 """Is 'version' sufficiently up-to-date?"""
40 return self.attribute is None or self.format is None or \
41 str(version) != "unknown" and version >= self.requested_version
42
43 def get_version(self, paths=None, default="unknown"):
44 """Get version number of installed module, 'None', or 'default'
45
46 Search 'paths' for module. If not found, return 'None'. If found,
47 return the extracted version attribute, or 'default' if no version
48 attribute was specified, or the value cannot be determined without
49 importing the module. The version is formatted according to the
50 requirement's version format (if any), unless it is 'None' or the
51 supplied 'default'.
52 """
53
54 if self.attribute is None:
55 try:
56 f, p, i = find_module(self.module, paths)
57 if f:
58 f.close()
59 return default
60 except ImportError:
61 return None
62
63 v = get_module_constant(self.module, self.attribute, default, paths)
64
65 if v is not None and v is not default and self.format is not None:
66 return self.format(v)
67
68 return v
69
70 def is_present(self, paths=None):
71 """Return true if dependency is present on 'paths'"""
72 return self.get_version(paths) is not None
73
74 def is_current(self, paths=None):
75 """Return true if dependency is present and up-to-date on 'paths'"""
76 version = self.get_version(paths)
77 if version is None:
78 return False
79 return self.version_ok(version)
80
81
82 def find_module(module, paths=None):
83 """Just like 'imp.find_module()', but with package support"""
84
85 parts = module.split('.')
86
87 while parts:
88 part = parts.pop(0)
89 f, path, (suffix, mode, kind) = info = imp.find_module(part, paths)
90
91 if kind == PKG_DIRECTORY:
92 parts = parts or ['__init__']
93 paths = [path]
94
95 elif parts:
96 raise ImportError("Can't find %r in %s" % (parts, module))
97
98 return info
99
100
101 def get_module_constant(module, symbol, default=-1, paths=None):
102 """Find 'module' by searching 'paths', and extract 'symbol'
103
104 Return 'None' if 'module' does not exist on 'paths', or it does not define
105 'symbol'. If the module defines 'symbol' as a constant, return the
106 constant. Otherwise, return 'default'."""
107
108 try:
109 f, path, (suffix, mode, kind) = find_module(module, paths)
110 except ImportError:
111 # Module doesn't exist
112 return None
113
114 try:
115 if kind == PY_COMPILED:
116 f.read(8) # skip magic & date
117 code = marshal.load(f)
118 elif kind == PY_FROZEN:
119 code = imp.get_frozen_object(module)
120 elif kind == PY_SOURCE:
121 code = compile(f.read(), path, 'exec')
122 else:
123 # Not something we can parse; we'll have to import it. :(
124 if module not in sys.modules:
125 imp.load_module(module, f, path, (suffix, mode, kind))
126 return getattr(sys.modules[module], symbol, None)
127
128 finally:
129 if f:
130 f.close()
131
132 return extract_constant(code, symbol, default)
133
134
135 def extract_constant(code, symbol, default=-1):
136 """Extract the constant value of 'symbol' from 'code'
137
138 If the name 'symbol' is bound to a constant value by the Python code
139 object 'code', return that value. If 'symbol' is bound to an expression,
140 return 'default'. Otherwise, return 'None'.
141
142 Return value is based on the first assignment to 'symbol'. 'symbol' must
143 be a global, or at least a non-"fast" local in the code block. That is,
144 only 'STORE_NAME' and 'STORE_GLOBAL' opcodes are checked, and 'symbol'
145 must be present in 'code.co_names'.
146 """
147 if symbol not in code.co_names:
148 # name's not there, can't possibly be an assignment
149 return None
150
151 name_idx = list(code.co_names).index(symbol)
152
153 STORE_NAME = 90
154 STORE_GLOBAL = 97
155 LOAD_CONST = 100
156
157 const = default
158
159 for byte_code in Bytecode(code):
160 op = byte_code.opcode
161 arg = byte_code.arg
162
163 if op == LOAD_CONST:
164 const = code.co_consts[arg]
165 elif arg == name_idx and (op == STORE_NAME or op == STORE_GLOBAL):
166 return const
167 else:
168 const = default
169
170
171 def _update_globals():
172 """
173 Patch the globals to remove the objects not available on some platforms.
174
175 XXX it'd be better to test assertions about bytecode instead.
176 """
177
178 if not sys.platform.startswith('java') and sys.platform != 'cli':
179 return
180 incompatible = 'extract_constant', 'get_module_constant'
181 for name in incompatible:
182 del globals()[name]
183 __all__.remove(name)
184
185
186 _update_globals()