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# Cython - Compilation-wide options and pragma declarations
cache_builtins = 1 # Perform lookups on builtin names only once
embed_pos_in_docstring = 0
gcc_branch_hints = 1
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 = 0
annotate = 0
# 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 = 1
# 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 = 0
# This will set local variables to None rather than NULL which may cause
# surpress what would be an UnboundLocalError in pure Python but eliminates
# checking for NULL on every use, and can decref rather than xdecref at the end.
# WARNING: This is a work in progress, may currently segfault.
init_local_none = 1
# Append the c file and line number to the traceback for exceptions.
c_line_in_traceback = 1
# Whether or not to embed the Python interpreter, for use in making a
# standalone executable. This will provide a main() method which simply
# executes the body of this module.
embed = False
# Declare compiler directives
directive_defaults = {
'boundscheck' : True,
'nonecheck' : False,
'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' : "",
'profile': False,
'infer_types': None,
'infer_types.verbose': False,
'autotestdict': True,
'language_level': 2,
'warn': None,
'warn.undeclared': False,
# test support
'test_assert_path_exists' : [],
'test_fail_if_path_exists' : [],
# experimental, subject to change
'binding': False,
# Override types possibilities above, if needed
directive_types = {
'infer_types' : bool, # values can be True/None/False
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'
'autotestdict' : ('module',),
'test_assert_path_exists' : ('function',),
'test_fail_if_path_exists' : ('function',),
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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