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annotate lib/python3.8/site-packages/setuptools/depends.py @ 0:9e54283cc701 draft

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"planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
author guerler
date Mon, 27 Jul 2020 03:47:31 -0400
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1 import sys
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2 import marshal
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3 import contextlib
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4 from distutils.version import StrictVersion
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5
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6 from .py33compat import Bytecode
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7
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8 from .py27compat import find_module, PY_COMPILED, PY_FROZEN, PY_SOURCE
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9 from . import py27compat
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10
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11
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12 __all__ = [
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13 'Require', 'find_module', 'get_module_constant', 'extract_constant'
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14 ]
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15
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16
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17 class Require:
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18 """A prerequisite to building or installing a distribution"""
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19
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20 def __init__(
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21 self, name, requested_version, module, homepage='',
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22 attribute=None, format=None):
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23
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24 if format is None and requested_version is not None:
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25 format = StrictVersion
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26
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27 if format is not None:
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28 requested_version = format(requested_version)
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29 if attribute is None:
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30 attribute = '__version__'
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31
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32 self.__dict__.update(locals())
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33 del self.self
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34
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35 def full_name(self):
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36 """Return full package/distribution name, w/version"""
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37 if self.requested_version is not None:
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38 return '%s-%s' % (self.name, self.requested_version)
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39 return self.name
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40
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41 def version_ok(self, version):
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42 """Is 'version' sufficiently up-to-date?"""
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43 return self.attribute is None or self.format is None or \
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44 str(version) != "unknown" and version >= self.requested_version
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45
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46 def get_version(self, paths=None, default="unknown"):
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47 """Get version number of installed module, 'None', or 'default'
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48
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49 Search 'paths' for module. If not found, return 'None'. If found,
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50 return the extracted version attribute, or 'default' if no version
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51 attribute was specified, or the value cannot be determined without
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52 importing the module. The version is formatted according to the
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53 requirement's version format (if any), unless it is 'None' or the
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54 supplied 'default'.
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55 """
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56
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57 if self.attribute is None:
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58 try:
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59 f, p, i = find_module(self.module, paths)
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60 if f:
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61 f.close()
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62 return default
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63 except ImportError:
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64 return None
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65
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66 v = get_module_constant(self.module, self.attribute, default, paths)
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67
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68 if v is not None and v is not default and self.format is not None:
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69 return self.format(v)
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70
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71 return v
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72
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73 def is_present(self, paths=None):
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74 """Return true if dependency is present on 'paths'"""
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75 return self.get_version(paths) is not None
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76
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77 def is_current(self, paths=None):
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78 """Return true if dependency is present and up-to-date on 'paths'"""
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79 version = self.get_version(paths)
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80 if version is None:
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81 return False
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82 return self.version_ok(version)
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83
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84
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85 def maybe_close(f):
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86 @contextlib.contextmanager
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87 def empty():
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88 yield
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89 return
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90 if not f:
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91 return empty()
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92
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93 return contextlib.closing(f)
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94
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95
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96 def get_module_constant(module, symbol, default=-1, paths=None):
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97 """Find 'module' by searching 'paths', and extract 'symbol'
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98
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99 Return 'None' if 'module' does not exist on 'paths', or it does not define
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100 'symbol'. If the module defines 'symbol' as a constant, return the
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101 constant. Otherwise, return 'default'."""
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102
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103 try:
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104 f, path, (suffix, mode, kind) = info = find_module(module, paths)
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105 except ImportError:
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106 # Module doesn't exist
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107 return None
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108
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109 with maybe_close(f):
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110 if kind == PY_COMPILED:
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111 f.read(8) # skip magic & date
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112 code = marshal.load(f)
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113 elif kind == PY_FROZEN:
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114 code = py27compat.get_frozen_object(module, paths)
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115 elif kind == PY_SOURCE:
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116 code = compile(f.read(), path, 'exec')
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117 else:
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118 # Not something we can parse; we'll have to import it. :(
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119 imported = py27compat.get_module(module, paths, info)
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120 return getattr(imported, symbol, None)
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121
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122 return extract_constant(code, symbol, default)
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123
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124
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125 def extract_constant(code, symbol, default=-1):
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126 """Extract the constant value of 'symbol' from 'code'
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127
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128 If the name 'symbol' is bound to a constant value by the Python code
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129 object 'code', return that value. If 'symbol' is bound to an expression,
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130 return 'default'. Otherwise, return 'None'.
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131
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132 Return value is based on the first assignment to 'symbol'. 'symbol' must
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133 be a global, or at least a non-"fast" local in the code block. That is,
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134 only 'STORE_NAME' and 'STORE_GLOBAL' opcodes are checked, and 'symbol'
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135 must be present in 'code.co_names'.
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136 """
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137 if symbol not in code.co_names:
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138 # name's not there, can't possibly be an assignment
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139 return None
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140
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141 name_idx = list(code.co_names).index(symbol)
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142
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143 STORE_NAME = 90
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144 STORE_GLOBAL = 97
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145 LOAD_CONST = 100
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146
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147 const = default
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148
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149 for byte_code in Bytecode(code):
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150 op = byte_code.opcode
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151 arg = byte_code.arg
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152
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153 if op == LOAD_CONST:
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154 const = code.co_consts[arg]
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155 elif arg == name_idx and (op == STORE_NAME or op == STORE_GLOBAL):
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156 return const
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157 else:
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158 const = default
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159
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160
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161 def _update_globals():
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162 """
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163 Patch the globals to remove the objects not available on some platforms.
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164
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165 XXX it'd be better to test assertions about bytecode instead.
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166 """
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167
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168 if not sys.platform.startswith('java') and sys.platform != 'cli':
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169 return
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170 incompatible = 'extract_constant', 'get_module_constant'
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171 for name in incompatible:
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172 del globals()[name]
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173 __all__.remove(name)
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174
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175
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176 _update_globals()