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Merge pull request #1434 from dstufft/vendor-pkg-resources
Vendor pkg_resources
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,16 @@ | ||
try: | ||
import ast | ||
from pip._vendor._markerlib.markers import default_environment, compile, interpret | ||
except ImportError: | ||
if 'ast' in globals(): | ||
raise | ||
def default_environment(): | ||
return {} | ||
def compile(marker): | ||
def marker_fn(environment=None, override=None): | ||
# 'empty markers are True' heuristic won't install extra deps. | ||
return not marker.strip() | ||
marker_fn.__doc__ = marker | ||
return marker_fn | ||
def interpret(marker, environment=None, override=None): | ||
return compile(marker)() |
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Original file line number | Diff line number | Diff line change |
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# -*- 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' | ||
""" | ||
|
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__all__ = ['default_environment', 'compile', 'interpret'] | ||
|
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import ast | ||
import os | ||
import platform | ||
import sys | ||
import weakref | ||
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_builtin_compile = compile | ||
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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 | ||
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# 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 | ||
} | ||
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for var in list(_VARS.keys()): | ||
if '.' in var: | ||
_VARS[var.replace('.', '_')] = _VARS[var] | ||
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def default_environment(): | ||
"""Return copy of default PEP 385 globals dictionary.""" | ||
return dict(_VARS) | ||
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class ASTWhitelist(ast.NodeTransformer): | ||
def __init__(self, statement): | ||
self.statement = statement # for error messages | ||
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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) | ||
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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) | ||
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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) | ||
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def parse_marker(marker): | ||
tree = ast.parse(marker, mode='eval') | ||
new_tree = ASTWhitelist(marker).generic_visit(tree) | ||
return new_tree | ||
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def compile_marker(parsed_marker): | ||
return _builtin_compile(parsed_marker, '<environment marker>', 'eval', | ||
dont_inherit=True) | ||
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_cache = weakref.WeakValueDictionary() | ||
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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] | ||
|
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def interpret(marker, environment=None): | ||
return compile(marker)(environment) |
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