Mercurial > repos > guerler > springsuite

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