annotate env/lib/python3.7/site-packages/virtualenv/create/describe.py @ 0:26e78fe6e8c4 draft

"planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
author shellac
date Sat, 02 May 2020 07:14:21 -0400
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1 from __future__ import absolute_import, print_function, unicode_literals
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2
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3 from abc import ABCMeta
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4 from collections import OrderedDict
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5
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6 from six import add_metaclass
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7
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8 from virtualenv.info import IS_WIN
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9 from virtualenv.util.path import Path
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10 from virtualenv.util.six import ensure_text
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11
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12
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13 @add_metaclass(ABCMeta)
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14 class Describe(object):
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15 """Given a host interpreter tell us information about what the created interpreter might look like"""
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16
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17 suffix = ".exe" if IS_WIN else ""
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18
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19 def __init__(self, dest, interpreter):
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20 self.interpreter = interpreter
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21 self.dest = dest
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22 self._stdlib = None
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23 self._stdlib_platform = None
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24 self._system_stdlib = None
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25 self._conf_vars = None
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26
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27 @property
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28 def bin_dir(self):
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29 return self.script_dir
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30
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31 @property
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32 def script_dir(self):
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33 return self.dest / Path(self.interpreter.distutils_install["scripts"])
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34
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35 @property
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36 def purelib(self):
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37 return self.dest / self.interpreter.distutils_install["purelib"]
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38
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39 @property
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40 def platlib(self):
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41 return self.dest / self.interpreter.distutils_install["platlib"]
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42
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43 @property
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44 def libs(self):
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45 return list(OrderedDict(((self.platlib, None), (self.purelib, None))).keys())
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46
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47 @property
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48 def stdlib(self):
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49 if self._stdlib is None:
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50 self._stdlib = Path(self.interpreter.sysconfig_path("stdlib", config_var=self._config_vars))
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51 return self._stdlib
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52
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53 @property
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54 def stdlib_platform(self):
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55 if self._stdlib_platform is None:
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56 self._stdlib_platform = Path(self.interpreter.sysconfig_path("platstdlib", config_var=self._config_vars))
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57 return self._stdlib_platform
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58
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59 @property
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60 def _config_vars(self):
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61 if self._conf_vars is None:
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62 self._conf_vars = self._calc_config_vars(ensure_text(str(self.dest)))
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63 return self._conf_vars
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64
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65 def _calc_config_vars(self, to):
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66 return {
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67 k: (to if v.startswith(self.interpreter.prefix) else v) for k, v in self.interpreter.sysconfig_vars.items()
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68 }
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69
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70 @classmethod
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71 def can_describe(cls, interpreter):
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72 """Knows means it knows how the output will look"""
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73 return True
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74
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75 @property
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76 def env_name(self):
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77 return ensure_text(self.dest.parts[-1])
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78
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79 @property
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80 def exe(self):
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81 return self.bin_dir / "{}{}".format(self.exe_stem(), self.suffix)
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82
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83 @classmethod
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84 def exe_stem(cls):
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85 """executable name without suffix - there seems to be no standard way to get this without creating it"""
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86 raise NotImplementedError
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87
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88 def script(self, name):
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89 return self.script_dir / "{}{}".format(name, self.suffix)
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90
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91
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92 @add_metaclass(ABCMeta)
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93 class Python2Supports(Describe):
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94 @classmethod
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95 def can_describe(cls, interpreter):
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96 return interpreter.version_info.major == 2 and super(Python2Supports, cls).can_describe(interpreter)
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97
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98
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99 @add_metaclass(ABCMeta)
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100 class Python3Supports(Describe):
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101 @classmethod
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102 def can_describe(cls, interpreter):
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103 return interpreter.version_info.major == 3 and super(Python3Supports, cls).can_describe(interpreter)
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104
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105
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106 @add_metaclass(ABCMeta)
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107 class PosixSupports(Describe):
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108 @classmethod
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109 def can_describe(cls, interpreter):
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110 return interpreter.os == "posix" and super(PosixSupports, cls).can_describe(interpreter)
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111
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112
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113 @add_metaclass(ABCMeta)
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114 class WindowsSupports(Describe):
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115 @classmethod
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116 def can_describe(cls, interpreter):
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117 return interpreter.os == "nt" and super(WindowsSupports, cls).can_describe(interpreter)