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# Cython - Compilation-wide options and pragma declarations
# Perform lookups on builtin names only once, at module initialisation
# time. This will prevent the module from getting imported if a
# builtin name that it uses cannot be found during initialisation.
cache_builtins = True
embed_pos_in_docstring = False
gcc_branch_hints = True
pre_import = None
docstrings = True
# Decref global variables in this module on exit for garbage collection.
# 0: None, 1+: interned objects, 2+: cdef globals, 3+: types objects
# Mostly for reducing noise for Valgrind, only executes at process exit
# (when all memory will be reclaimed anyways).
generate_cleanup_code = False
annotate = False
# This will abort the compilation on the first error occured rather than trying
# to keep going and printing further error messages.
fast_fail = False
# Make all warnings into errors.
warning_errors = False
# Make unknown names an error. Python raises a NameError when
# encountering unknown names at runtime, whereas this option makes
# them a compile time error. If you want full Python compatibility,
# you should disable this option and also 'cache_builtins'.
error_on_unknown_names = True
# This will convert statements of the form "for i in range(...)"
# to "for i from ..." when i is a cdef'd integer type, and the direction
# (i.e. sign of step) can be determined.
# WARNING: This may change the semantics if the range causes assignment to
# i to overflow. Specifically, if this option is set, an error will be
# raised before the loop is entered, wheras without this option the loop
# will execute until an overflowing value is encountered.
convert_range = True
# Enable this to allow one to write = ... to overwrite the
# definition if the cpdef function foo, at the cost of an extra dictionary
# lookup on every call.
# If this is 0 it simply creates a wrapper.
lookup_module_cpdef = False
# Whether or not to embed the Python interpreter, for use in making a
# standalone executable or calling from external libraries.
# This will provide a method which initalizes the interpreter and
# executes the body of this module.
embed = None
# Disables function redefinition, allowing all functions to be declared at
# module creation time. For legacy code only, needed for some circular imports.
disable_function_redefinition = False
# In previous iterations of Cython, globals() gave the first non-Cython module
# globals in the call stack. Sage relies on this behavior for variable injection.
old_style_globals = False
# Allows cimporting from a pyx file without a pxd file.
cimport_from_pyx = False
# max # of dims for buffers -- set lower than number of dimensions in numpy, as
# slices are passed by value and involve a lot of copying
buffer_max_dims = 8
# Declare compiler directives
directive_defaults = {
'boundscheck' : True,
'nonecheck' : False,
'initializedcheck' : True,
'embedsignature' : False,
'locals' : {},
'auto_cpdef': False,
'cdivision': False, # was True before 0.12
'cdivision_warnings': False,
'always_allow_keywords': False,
'allow_none_for_extension_args': True,
'wraparound' : True,
'ccomplex' : False, # use C99/C++ for complex types and arith
'callspec' : "",
'final' : False,
'internal' : False,
'profile': False,
'infer_types': None,
'infer_types.verbose': False,
'autotestdict': True,
'autotestdict.cdef': False,
'autotestdict.all': False,
'language_level': 2,
'fast_getattr': False, # Undocumented until we come up with a better way to handle this everywhere.
'py2_import': False, # For backward compatibility of Cython's source code in Py3 source mode
'warn': None,
'warn.undeclared': False,
'warn.unreachable': True,
'warn.maybe_uninitialized': False,
'warn.unused': False,
'warn.unused_arg': False,
'warn.unused_result': False,
# optimizations
'optimize.inline_defnode_calls': False,
# remove unreachable code
'remove_unreachable': True,
# control flow debug directives
'control_flow.dot_output': "", # Graphviz output filename
'control_flow.dot_annotate_defs': False, # Annotate definitions
# test support
'test_assert_path_exists' : [],
'test_fail_if_path_exists' : [],
# experimental, subject to change
'binding': False,
# Extra warning directives
extra_warnings = {
'warn.maybe_uninitialized': True,
'warn.unreachable': True,
'warn.unused': True,
# Override types possibilities above, if needed
directive_types = {
'final' : bool, # final cdef classes and methods
'internal' : bool, # cdef class visibility in the module dict
'infer_types' : bool, # values can be True/None/False
'cfunc' : None, # decorators do not take directive value
'ccall' : None,
'cclass' : None,
'returns' : type,
for key, val in directive_defaults.items():
if key not in directive_types:
directive_types[key] = type(val)
directive_scopes = { # defaults to available everywhere
# 'module', 'function', 'class', 'with statement'
'final' : ('cclass', 'function'),
'internal' : ('cclass',),
'autotestdict' : ('module',),
'autotestdict.all' : ('module',),
'autotestdict.cdef' : ('module',),
'test_assert_path_exists' : ('function', 'class', 'cclass'),
'test_fail_if_path_exists' : ('function', 'class', 'cclass'),
def parse_directive_value(name, value, relaxed_bool=False):
Parses value as an option value for the given name and returns
the interpreted value. None is returned if the option does not exist.
>>> print parse_directive_value('nonexisting', 'asdf asdfd')
>>> parse_directive_value('boundscheck', 'True')
>>> parse_directive_value('boundscheck', 'true')
Traceback (most recent call last):
ValueError: boundscheck directive must be set to True or False, got 'true'
type = directive_types.get(name)
if not type: return None
orig_value = value
if type is bool:
value = str(value)
if value == 'True': return True
if value == 'False': return False
if relaxed_bool:
value = value.lower()
if value in ("true", "yes"): return True
elif value in ("false", "no"): return False
raise ValueError("%s directive must be set to True or False, got '%s'" % (
name, orig_value))
elif type is int:
return int(value)
except ValueError:
raise ValueError("%s directive must be set to an integer, got '%s'" % (
name, orig_value))
elif type is str:
return str(value)
assert False
def parse_directive_list(s, relaxed_bool=False, ignore_unknown=False,
Parses a comma-separated list of pragma options. Whitespace
is not considered.
>>> parse_directive_list(' ')
>>> (parse_directive_list('boundscheck=True') ==
... {'boundscheck': True})
>>> parse_directive_list(' asdf')
Traceback (most recent call last):
ValueError: Expected "=" in option "asdf"
>>> parse_directive_list('boundscheck=hey')
Traceback (most recent call last):
ValueError: boundscheck directive must be set to True or False, got 'hey'
>>> parse_directive_list('unknown=True')
Traceback (most recent call last):
ValueError: Unknown option: "unknown"
if current_settings is None:
result = {}
result = current_settings
for item in s.split(','):
item = item.strip()
if not item: continue
if not '=' in item: raise ValueError('Expected "=" in option "%s"' % item)
name, value = [ s.strip() for s in item.strip().split('=', 1) ]
parsed_value = parse_directive_value(name, value, relaxed_bool=relaxed_bool)
if parsed_value is None:
if not ignore_unknown:
raise ValueError('Unknown option: "%s"' % name)
result[name] = parsed_value
return result
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