Adding cython v0.20.2 in third-party.

third_party/cython/src/Cython/Compiler/Options.py

Index: third_party/cython/src/Cython/Compiler/Options.py
diff --git a/third_party/cython/src/Cython/Compiler/Options.py b/third_party/cython/src/Cython/Compiler/Options.py
new file mode 100644
index 0000000000000000000000000000000000000000..ab9177f002ba9af6d864409afa11547ee9cf7e0e
--- /dev/null
+++ b/third_party/cython/src/Cython/Compiler/Options.py
@@ -0,0 +1,343 @@
+#
+#  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
+
+# Make uninitialized local variable reference a compile time error.
+# Python raises UnboundLocalError at runtime, whereas this option makes
+# them a compile time error. Note that this option affects only variables
+# of "python object" type.
+error_on_uninitialized = 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 your_module.foo = ... 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
+
+# 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
+
+# Number of function closure instances to keep in a freelist (0: no freelists)
+closure_freelist_size = 8
+
+# Should tp_clear() set object fields to None instead of clearing them to NULL?
+clear_to_none = True
+
+
+# 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,
+    'overflowcheck': False,
+    'overflowcheck.fold': True,
+    '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,
+    'no_gc_clear': False,
+    'linetrace': 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
+    'c_string_type': 'bytes',
+    'c_string_encoding': '',
+    'type_version_tag': True,   # enables Py_TPFLAGS_HAVE_VERSION_TAG on extension types
+    'unraisable_tracebacks': False,
+
+    # set __file__ and/or __path__ to known source/target path at import time (instead of not having them available)
+    'set_initial_path' : None,  # SOURCEFILE or "/full/path/to/module"
+
+    'warn': None,
+    'warn.undeclared': False,
+    'warn.unreachable': True,
+    'warn.maybe_uninitialized': False,
+    'warn.unused': False,
+    'warn.unused_arg': False,
+    'warn.unused_result': False,
+    'warn.multiple_declarators': True,
+
+# optimizations
+    'optimize.inline_defnode_calls': True,
+
+# 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': None,
+    'freelist': 0,
+}
+
+# Extra warning directives
+extra_warnings = {
+    'warn.maybe_uninitialized': True,
+    'warn.unreachable': True,
+    'warn.unused': True,
+}
+
+def one_of(*args):
+    def validate(name, value):
+        if value not in args:
+            raise ValueError("%s directive must be one of %s, got '%s'" % (
+                name, args, value))
+        else:
+            return value
+    return validate
+
+
+def normalise_encoding_name(option_name, encoding):
+    """
+    >>> normalise_encoding_name('c_string_encoding', 'ascii')
+    'ascii'
+    >>> normalise_encoding_name('c_string_encoding', 'AsCIi')
+    'ascii'
+    >>> normalise_encoding_name('c_string_encoding', 'us-ascii')
+    'ascii'
+    >>> normalise_encoding_name('c_string_encoding', 'utF8')
+    'utf8'
+    >>> normalise_encoding_name('c_string_encoding', 'utF-8')
+    'utf8'
+    >>> normalise_encoding_name('c_string_encoding', 'deFAuLT')
+    'default'
+    >>> normalise_encoding_name('c_string_encoding', 'default')
+    'default'
+    >>> normalise_encoding_name('c_string_encoding', 'SeriousLyNoSuch--Encoding')
+    'SeriousLyNoSuch--Encoding'
+    """
+    if not encoding:
+        return ''
+    if encoding.lower() in ('default', 'ascii', 'utf8'):
+        return encoding.lower()
+    import codecs
+    try:
+        decoder = codecs.getdecoder(encoding)
+    except LookupError:
+        return encoding  # may exists at runtime ...
+    for name in ('ascii', 'utf8'):
+        if codecs.getdecoder(name) == decoder:
+            return name
+    return encoding
+
+
+# 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
+    'binding' : bool,
+    'cfunc' : None, # decorators do not take directive value
+    'ccall' : None,
+    'cclass' : None,
+    'returns' : type,
+    'set_initial_path': str,
+    'freelist': int,
+    'c_string_type': one_of('bytes', 'bytearray', 'str', 'unicode'),
+    'c_string_encoding': normalise_encoding_name,
+}
+
+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'),
+    'no_gc_clear' : ('cclass',),
+    'internal' : ('cclass',),
+    'autotestdict' : ('module',),
+    'autotestdict.all' : ('module',),
+    'autotestdict.cdef' : ('module',),
+    'set_initial_path' : ('module',),
+    'test_assert_path_exists' : ('function', 'class', 'cclass'),
+    'test_fail_if_path_exists' : ('function', 'class', 'cclass'),
+    'freelist': ('cclass',),
+    # Avoid scope-specific to/from_py_functions for c_string.
+    'c_string_type': ('module',),
+    'c_string_encoding': ('module',),
+    'type_version_tag': ('module', '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')
+    None
+    >>> parse_directive_value('boundscheck', 'True')
+    True
+    >>> parse_directive_value('boundscheck', 'true')
+    Traceback (most recent call last):
+       ...
+    ValueError: boundscheck directive must be set to True or False, got 'true'
+
+    >>> parse_directive_value('c_string_encoding', 'us-ascii')
+    'ascii'
+    >>> parse_directive_value('c_string_type', 'str')
+    'str'
+    >>> parse_directive_value('c_string_type', 'bytes')
+    'bytes'
+    >>> parse_directive_value('c_string_type', 'bytearray')
+    'bytearray'
+    >>> parse_directive_value('c_string_type', 'unicode')
+    'unicode'
+    >>> parse_directive_value('c_string_type', 'unnicode')
+    Traceback (most recent call last):
+    ValueError: c_string_type directive must be one of ('bytes', 'bytearray', 'str', 'unicode'), got 'unnicode'
+    """
+    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:
+        try:
+            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)
+    elif callable(type):
+        return type(name, value)
+    else:
+        assert False
+
+def parse_directive_list(s, relaxed_bool=False, ignore_unknown=False,
+                         current_settings=None):
+    """
+    Parses a comma-separated list of pragma options. Whitespace
+    is not considered.
+
+    >>> parse_directive_list('      ')
+    {}
+    >>> (parse_directive_list('boundscheck=True') ==
+    ... {'boundscheck': True})
+    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"
+    >>> warnings = parse_directive_list('warn.all=True')
+    >>> len(warnings) > 1
+    True
+    >>> sum(warnings.values()) == len(warnings)  # all true.
+    True
+    """
+    if current_settings is None:
+        result = {}
+    else:
+        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) ]
+        if name not in directive_defaults:
+            found = False
+            if name.endswith('.all'):
+                prefix = name[:-3]
+                for directive in directive_defaults:
+                    if directive.startswith(prefix):
+                        found = True
+                        parsed_value = parse_directive_value(directive, value, relaxed_bool=relaxed_bool)
+                        result[directive] = parsed_value
+            if not found and not ignore_unknown:
+                raise ValueError('Unknown option: "%s"' % name)
+        else:
+            parsed_value = parse_directive_value(name, value, relaxed_bool=relaxed_bool)
+            result[name] = parsed_value
+    return result