Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/setuptools/depends.py @ 0:4f3585e2f14b draft default tip
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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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 import dis |
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5 from distutils.version import StrictVersion |
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6 |
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7 from ._imp import find_module, PY_COMPILED, PY_FROZEN, PY_SOURCE |
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8 from . import _imp |
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9 |
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10 |
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11 __all__ = [ |
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12 'Require', 'find_module', 'get_module_constant', 'extract_constant' |
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13 ] |
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14 |
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15 |
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16 class Require: |
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17 """A prerequisite to building or installing a distribution""" |
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18 |
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19 def __init__( |
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20 self, name, requested_version, module, homepage='', |
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21 attribute=None, format=None): |
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22 |
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23 if format is None and requested_version is not None: |
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24 format = StrictVersion |
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25 |
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26 if format is not None: |
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27 requested_version = format(requested_version) |
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28 if attribute is None: |
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29 attribute = '__version__' |
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30 |
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31 self.__dict__.update(locals()) |
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32 del self.self |
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33 |
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34 def full_name(self): |
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35 """Return full package/distribution name, w/version""" |
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36 if self.requested_version is not None: |
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37 return '%s-%s' % (self.name, self.requested_version) |
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38 return self.name |
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39 |
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40 def version_ok(self, version): |
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41 """Is 'version' sufficiently up-to-date?""" |
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42 return self.attribute is None or self.format is None or \ |
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43 str(version) != "unknown" and version >= self.requested_version |
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44 |
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45 def get_version(self, paths=None, default="unknown"): |
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46 """Get version number of installed module, 'None', or 'default' |
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47 |
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48 Search 'paths' for module. If not found, return 'None'. If found, |
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49 return the extracted version attribute, or 'default' if no version |
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50 attribute was specified, or the value cannot be determined without |
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51 importing the module. The version is formatted according to the |
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52 requirement's version format (if any), unless it is 'None' or the |
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53 supplied 'default'. |
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54 """ |
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55 |
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56 if self.attribute is None: |
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57 try: |
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58 f, p, i = find_module(self.module, paths) |
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59 if f: |
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60 f.close() |
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61 return default |
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62 except ImportError: |
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63 return None |
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64 |
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65 v = get_module_constant(self.module, self.attribute, default, paths) |
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66 |
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67 if v is not None and v is not default and self.format is not None: |
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68 return self.format(v) |
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69 |
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70 return v |
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71 |
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72 def is_present(self, paths=None): |
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73 """Return true if dependency is present on 'paths'""" |
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74 return self.get_version(paths) is not None |
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75 |
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76 def is_current(self, paths=None): |
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77 """Return true if dependency is present and up-to-date on 'paths'""" |
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78 version = self.get_version(paths) |
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79 if version is None: |
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80 return False |
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81 return self.version_ok(version) |
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82 |
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83 |
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84 def maybe_close(f): |
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85 @contextlib.contextmanager |
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86 def empty(): |
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87 yield |
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88 return |
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89 if not f: |
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90 return empty() |
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91 |
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92 return contextlib.closing(f) |
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93 |
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94 |
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95 def get_module_constant(module, symbol, default=-1, paths=None): |
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96 """Find 'module' by searching 'paths', and extract 'symbol' |
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97 |
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98 Return 'None' if 'module' does not exist on 'paths', or it does not define |
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99 'symbol'. If the module defines 'symbol' as a constant, return the |
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100 constant. Otherwise, return 'default'.""" |
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101 |
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102 try: |
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103 f, path, (suffix, mode, kind) = info = find_module(module, paths) |
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104 except ImportError: |
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105 # Module doesn't exist |
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106 return None |
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107 |
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108 with maybe_close(f): |
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109 if kind == PY_COMPILED: |
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110 f.read(8) # skip magic & date |
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111 code = marshal.load(f) |
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112 elif kind == PY_FROZEN: |
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113 code = _imp.get_frozen_object(module, paths) |
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114 elif kind == PY_SOURCE: |
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115 code = compile(f.read(), path, 'exec') |
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116 else: |
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117 # Not something we can parse; we'll have to import it. :( |
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118 imported = _imp.get_module(module, paths, info) |
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119 return getattr(imported, symbol, None) |
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120 |
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121 return extract_constant(code, symbol, default) |
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122 |
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123 |
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124 def extract_constant(code, symbol, default=-1): |
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125 """Extract the constant value of 'symbol' from 'code' |
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126 |
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127 If the name 'symbol' is bound to a constant value by the Python code |
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128 object 'code', return that value. If 'symbol' is bound to an expression, |
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129 return 'default'. Otherwise, return 'None'. |
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130 |
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131 Return value is based on the first assignment to 'symbol'. 'symbol' must |
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132 be a global, or at least a non-"fast" local in the code block. That is, |
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133 only 'STORE_NAME' and 'STORE_GLOBAL' opcodes are checked, and 'symbol' |
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134 must be present in 'code.co_names'. |
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135 """ |
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136 if symbol not in code.co_names: |
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137 # name's not there, can't possibly be an assignment |
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138 return None |
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139 |
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140 name_idx = list(code.co_names).index(symbol) |
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141 |
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142 STORE_NAME = 90 |
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143 STORE_GLOBAL = 97 |
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144 LOAD_CONST = 100 |
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145 |
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146 const = default |
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147 |
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148 for byte_code in dis.Bytecode(code): |
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149 op = byte_code.opcode |
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150 arg = byte_code.arg |
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151 |
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152 if op == LOAD_CONST: |
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153 const = code.co_consts[arg] |
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154 elif arg == name_idx and (op == STORE_NAME or op == STORE_GLOBAL): |
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155 return const |
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156 else: |
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157 const = default |
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158 |
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159 |
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160 def _update_globals(): |
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161 """ |
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162 Patch the globals to remove the objects not available on some platforms. |
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163 |
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164 XXX it'd be better to test assertions about bytecode instead. |
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165 """ |
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166 |
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167 if not sys.platform.startswith('java') and sys.platform != 'cli': |
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168 return |
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169 incompatible = 'extract_constant', 'get_module_constant' |
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170 for name in incompatible: |
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171 del globals()[name] |
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172 __all__.remove(name) |
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173 |
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174 |
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175 _update_globals() |