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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
# This is a SAGE-specific option that will
# cause Cython to incref local variables before
# performing a binary operation on them, for
# safe detection of inplace operators.
incref_local_binop = 0
# 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 symantics 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 util a 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
# Optimize no argument and one argument methods by using the METH_O and METH_NOARGS
# calling conventions. These are faster calling conventions, but disallow the use of
# keywords (which, admittedly, are of little use in these cases).
optimize_simple_methods = 1
# Append the c file and line number to the traceback for exceptions.
c_line_in_traceback = 1
# Declare pragmas
option_types = {
'boundscheck' : bool,
'nonecheck' : bool,
'embedsignature' : bool,
'locals' : dict,
'auto_cpdef': bool,
option_defaults = {
'boundscheck' : True,
'nonecheck' : False,
'embedsignature' : False,
'locals' : {},
'auto_cpdef': False,
def parse_option_value(name, value):
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_option_value('nonexisting', 'asdf asdfd')
>>> parse_option_value('boundscheck', 'True')
>>> parse_option_value('boundscheck', 'true')
Traceback (most recent call last):
ValueError: boundscheck directive must be set to True or False
type = option_types.get(name)
if not type: return None
if type is bool:
if value == "True": return True
elif value == "False": return False
else: raise ValueError("%s directive must be set to True or False" % name)
assert False
def parse_option_list(s):
Parses a comma-seperated list of pragma options. Whitespace
is not considered.
>>> parse_option_list(' ')
>>> (parse_option_list('boundscheck=True') ==
... {'boundscheck': True})
>>> parse_option_list(' asdf')
Traceback (most recent call last):
ValueError: Expected "=" in option "asdf"
>>> parse_option_list('boundscheck=hey')
Traceback (most recent call last):
ValueError: Must pass a boolean value for option "boundscheck"
>>> parse_option_list('unknown=True')
Traceback (most recent call last):
ValueError: Unknown option: "unknown"
result = {}
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 = item.strip().split('=')
type = option_types[name]
except KeyError:
raise ValueError('Unknown option: "%s"' % name)
if type is bool:
value = value.lower()
if value in ('true', 'yes'):
value = True
elif value in ('false', 'no'):
value = False
else: raise ValueError('Must pass a boolean value for option "%s"' % name)
result[name] = value
assert False
return result
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