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author | 2017-03-29 13:35:45 +0300 | |
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committer | 2017-03-29 13:35:45 +0300 | |
commit | e2cc2530fc6d54ebc975c01a4ff887ce12f0a736 (patch) | |
tree | 38385867295c8a09fb0d7f8eaf5fa78179e5b13a /jython-tosca-parser/src/main/resources/Lib/site-packages/pip/_vendor/_markerlib/markers.py | |
parent | bccebaa9888906f8ff78172f62ec592956066d82 (diff) |
[SDC-6] sdc-distribution-client 1707 rebasing
Change-Id: I322a05fd79beb6ba4fee4d32afffecf531b86e98
Signed-off-by: Pavel Aharoni <pa0916@att.com>
Diffstat (limited to 'jython-tosca-parser/src/main/resources/Lib/site-packages/pip/_vendor/_markerlib/markers.py')
-rw-r--r-- | jython-tosca-parser/src/main/resources/Lib/site-packages/pip/_vendor/_markerlib/markers.py | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/jython-tosca-parser/src/main/resources/Lib/site-packages/pip/_vendor/_markerlib/markers.py b/jython-tosca-parser/src/main/resources/Lib/site-packages/pip/_vendor/_markerlib/markers.py new file mode 100644 index 0000000..fa83706 --- /dev/null +++ b/jython-tosca-parser/src/main/resources/Lib/site-packages/pip/_vendor/_markerlib/markers.py @@ -0,0 +1,119 @@ +# -*- coding: utf-8 -*- +"""Interpret PEP 345 environment markers. + +EXPR [in|==|!=|not in] EXPR [or|and] ... + +where EXPR belongs to any of those: + + python_version = '%s.%s' % (sys.version_info[0], sys.version_info[1]) + python_full_version = sys.version.split()[0] + os.name = os.name + sys.platform = sys.platform + platform.version = platform.version() + platform.machine = platform.machine() + platform.python_implementation = platform.python_implementation() + a free string, like '2.6', or 'win32' +""" + +__all__ = ['default_environment', 'compile', 'interpret'] + +import ast +import os +import platform +import sys +import weakref + +_builtin_compile = compile + +try: + from platform import python_implementation +except ImportError: + if os.name == "java": + # Jython 2.5 has ast module, but not platform.python_implementation() function. + def python_implementation(): + return "Jython" + else: + raise + + +# restricted set of variables +_VARS = {'sys.platform': sys.platform, + 'python_version': '%s.%s' % sys.version_info[:2], + # FIXME parsing sys.platform is not reliable, but there is no other + # way to get e.g. 2.7.2+, and the PEP is defined with sys.version + 'python_full_version': sys.version.split(' ', 1)[0], + 'os.name': os.name, + 'platform.version': platform.version(), + 'platform.machine': platform.machine(), + 'platform.python_implementation': python_implementation(), + 'extra': None # wheel extension + } + +for var in list(_VARS.keys()): + if '.' in var: + _VARS[var.replace('.', '_')] = _VARS[var] + +def default_environment(): + """Return copy of default PEP 385 globals dictionary.""" + return dict(_VARS) + +class ASTWhitelist(ast.NodeTransformer): + def __init__(self, statement): + self.statement = statement # for error messages + + ALLOWED = (ast.Compare, ast.BoolOp, ast.Attribute, ast.Name, ast.Load, ast.Str) + # Bool operations + ALLOWED += (ast.And, ast.Or) + # Comparison operations + ALLOWED += (ast.Eq, ast.Gt, ast.GtE, ast.In, ast.Is, ast.IsNot, ast.Lt, ast.LtE, ast.NotEq, ast.NotIn) + + def visit(self, node): + """Ensure statement only contains allowed nodes.""" + if not isinstance(node, self.ALLOWED): + raise SyntaxError('Not allowed in environment markers.\n%s\n%s' % + (self.statement, + (' ' * node.col_offset) + '^')) + return ast.NodeTransformer.visit(self, node) + + def visit_Attribute(self, node): + """Flatten one level of attribute access.""" + new_node = ast.Name("%s.%s" % (node.value.id, node.attr), node.ctx) + return ast.copy_location(new_node, node) + +def parse_marker(marker): + tree = ast.parse(marker, mode='eval') + new_tree = ASTWhitelist(marker).generic_visit(tree) + return new_tree + +def compile_marker(parsed_marker): + return _builtin_compile(parsed_marker, '<environment marker>', 'eval', + dont_inherit=True) + +_cache = weakref.WeakValueDictionary() + +def compile(marker): + """Return compiled marker as a function accepting an environment dict.""" + try: + return _cache[marker] + except KeyError: + pass + if not marker.strip(): + def marker_fn(environment=None, override=None): + """""" + return True + else: + compiled_marker = compile_marker(parse_marker(marker)) + def marker_fn(environment=None, override=None): + """override updates environment""" + if override is None: + override = {} + if environment is None: + environment = default_environment() + environment.update(override) + return eval(compiled_marker, environment) + marker_fn.__doc__ = marker + _cache[marker] = marker_fn + return _cache[marker] + +def interpret(marker, environment=None): + return compile(marker)(environment) |