Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/distlib/markers.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
parents d30785e31577
children
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1 # -*- coding: utf-8 -*-
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2 #
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3 # Copyright (C) 2012-2017 Vinay Sajip.
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4 # Licensed to the Python Software Foundation under a contributor agreement.
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5 # See LICENSE.txt and CONTRIBUTORS.txt.
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6 #
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7 """
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8 Parser for the environment markers micro-language defined in PEP 508.
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9 """
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10
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11 # Note: In PEP 345, the micro-language was Python compatible, so the ast
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12 # module could be used to parse it. However, PEP 508 introduced operators such
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13 # as ~= and === which aren't in Python, necessitating a different approach.
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14
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15 import os
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16 import sys
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17 import platform
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18 import re
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19
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20 from .compat import python_implementation, urlparse, string_types
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21 from .util import in_venv, parse_marker
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22
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23 __all__ = ['interpret']
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24
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25 def _is_literal(o):
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26 if not isinstance(o, string_types) or not o:
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27 return False
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28 return o[0] in '\'"'
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29
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30 class Evaluator(object):
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31 """
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32 This class is used to evaluate marker expessions.
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33 """
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34
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35 operations = {
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36 '==': lambda x, y: x == y,
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37 '===': lambda x, y: x == y,
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38 '~=': lambda x, y: x == y or x > y,
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39 '!=': lambda x, y: x != y,
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40 '<': lambda x, y: x < y,
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41 '<=': lambda x, y: x == y or x < y,
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42 '>': lambda x, y: x > y,
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43 '>=': lambda x, y: x == y or x > y,
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44 'and': lambda x, y: x and y,
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45 'or': lambda x, y: x or y,
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46 'in': lambda x, y: x in y,
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47 'not in': lambda x, y: x not in y,
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48 }
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49
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50 def evaluate(self, expr, context):
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51 """
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52 Evaluate a marker expression returned by the :func:`parse_requirement`
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53 function in the specified context.
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54 """
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55 if isinstance(expr, string_types):
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56 if expr[0] in '\'"':
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57 result = expr[1:-1]
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58 else:
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59 if expr not in context:
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60 raise SyntaxError('unknown variable: %s' % expr)
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61 result = context[expr]
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62 else:
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63 assert isinstance(expr, dict)
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64 op = expr['op']
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65 if op not in self.operations:
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66 raise NotImplementedError('op not implemented: %s' % op)
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67 elhs = expr['lhs']
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68 erhs = expr['rhs']
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69 if _is_literal(expr['lhs']) and _is_literal(expr['rhs']):
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70 raise SyntaxError('invalid comparison: %s %s %s' % (elhs, op, erhs))
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71
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72 lhs = self.evaluate(elhs, context)
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73 rhs = self.evaluate(erhs, context)
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74 result = self.operations[op](lhs, rhs)
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75 return result
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76
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77 def default_context():
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78 def format_full_version(info):
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79 version = '%s.%s.%s' % (info.major, info.minor, info.micro)
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80 kind = info.releaselevel
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81 if kind != 'final':
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82 version += kind[0] + str(info.serial)
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83 return version
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84
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85 if hasattr(sys, 'implementation'):
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86 implementation_version = format_full_version(sys.implementation.version)
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87 implementation_name = sys.implementation.name
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88 else:
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89 implementation_version = '0'
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90 implementation_name = ''
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91
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92 result = {
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93 'implementation_name': implementation_name,
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94 'implementation_version': implementation_version,
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95 'os_name': os.name,
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96 'platform_machine': platform.machine(),
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97 'platform_python_implementation': platform.python_implementation(),
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98 'platform_release': platform.release(),
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99 'platform_system': platform.system(),
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100 'platform_version': platform.version(),
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101 'platform_in_venv': str(in_venv()),
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102 'python_full_version': platform.python_version(),
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103 'python_version': platform.python_version()[:3],
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104 'sys_platform': sys.platform,
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105 }
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106 return result
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107
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108 DEFAULT_CONTEXT = default_context()
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109 del default_context
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110
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111 evaluator = Evaluator()
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112
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113 def interpret(marker, execution_context=None):
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114 """
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115 Interpret a marker and return a result depending on environment.
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116
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117 :param marker: The marker to interpret.
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118 :type marker: str
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119 :param execution_context: The context used for name lookup.
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120 :type execution_context: mapping
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121 """
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122 try:
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123 expr, rest = parse_marker(marker)
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124 except Exception as e:
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125 raise SyntaxError('Unable to interpret marker syntax: %s: %s' % (marker, e))
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126 if rest and rest[0] != '#':
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127 raise SyntaxError('unexpected trailing data in marker: %s: %s' % (marker, rest))
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128 context = dict(DEFAULT_CONTEXT)
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129 if execution_context:
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parents:
diff changeset
130 context.update(execution_context)
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
131 return evaluator.evaluate(expr, context)