Viewing file:  test_source_encoding.py (5.21 KB) -rw-r--r--
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from .. import util
machinery = util.import_importlib('importlib.machinery')
import codecs
import importlib.util
import re
import types
# Because sys.path gets essentially blanked, need to have unicodedata already
# imported for the parser to use.
import unicodedata
import unittest
import warnings
CODING_RE = re.compile(r'^[ \t\f]*#.*?coding[:=][ \t]*([-\w.]+)', re.ASCII)
class EncodingTest:
"""PEP 3120 makes UTF-8 the default encoding for source code
[default encoding].
PEP 263 specifies how that can change on a per-file basis. Either the first
or second line can contain the encoding line [encoding first line]
[encoding second line]. If the file has the BOM marker it is considered UTF-8
implicitly [BOM]. If any encoding is specified it must be UTF-8, else it is
an error [BOM and utf-8][BOM conflict].
"""
variable = '\u00fc'
character = '\u00c9'
source_line = "{0} = '{1}'\n".format(variable, character)
module_name = '_temp'
def run_test(self, source):
with util.create_modules(self.module_name) as mapping:
with open(mapping[self.module_name], 'wb') as file:
file.write(source)
loader = self.machinery.SourceFileLoader(self.module_name,
mapping[self.module_name])
return self.load(loader)
def create_source(self, encoding):
encoding_line = "# coding={0}".format(encoding)
assert CODING_RE.match(encoding_line)
source_lines = [encoding_line.encode('utf-8')]
source_lines.append(self.source_line.encode(encoding))
return b'\n'.join(source_lines)
def test_non_obvious_encoding(self):
# Make sure that an encoding that has never been a standard one for
# Python works.
encoding_line = "# coding=koi8-r"
assert CODING_RE.match(encoding_line)
source = "{0}\na=42\n".format(encoding_line).encode("koi8-r")
self.run_test(source)
# [default encoding]
def test_default_encoding(self):
self.run_test(self.source_line.encode('utf-8'))
# [encoding first line]
def test_encoding_on_first_line(self):
encoding = 'Latin-1'
source = self.create_source(encoding)
self.run_test(source)
# [encoding second line]
def test_encoding_on_second_line(self):
source = b"#/usr/bin/python\n" + self.create_source('Latin-1')
self.run_test(source)
# [BOM]
def test_bom(self):
self.run_test(codecs.BOM_UTF8 + self.source_line.encode('utf-8'))
# [BOM and utf-8]
def test_bom_and_utf_8(self):
source = codecs.BOM_UTF8 + self.create_source('utf-8')
self.run_test(source)
# [BOM conflict]
def test_bom_conflict(self):
source = codecs.BOM_UTF8 + self.create_source('latin-1')
with self.assertRaises(SyntaxError):
self.run_test(source)
class EncodingTestPEP451(EncodingTest):
def load(self, loader):
module = types.ModuleType(self.module_name)
module.__spec__ = importlib.util.spec_from_loader(self.module_name, loader)
loader.exec_module(module)
return module
(Frozen_EncodingTestPEP451,
Source_EncodingTestPEP451
) = util.test_both(EncodingTestPEP451, machinery=machinery)
class EncodingTestPEP302(EncodingTest):
def load(self, loader):
with warnings.catch_warnings():
warnings.simplefilter('ignore', DeprecationWarning)
return loader.load_module(self.module_name)
(Frozen_EncodingTestPEP302,
Source_EncodingTestPEP302
) = util.test_both(EncodingTestPEP302, machinery=machinery)
class LineEndingTest:
r"""Source written with the three types of line endings (\n, \r\n, \r)
need to be readable [cr][crlf][lf]."""
def run_test(self, line_ending):
module_name = '_temp'
source_lines = [b"a = 42", b"b = -13", b'']
source = line_ending.join(source_lines)
with util.create_modules(module_name) as mapping:
with open(mapping[module_name], 'wb') as file:
file.write(source)
loader = self.machinery.SourceFileLoader(module_name,
mapping[module_name])
return self.load(loader, module_name)
# [cr]
def test_cr(self):
self.run_test(b'\r')
# [crlf]
def test_crlf(self):
self.run_test(b'\r\n')
# [lf]
def test_lf(self):
self.run_test(b'\n')
class LineEndingTestPEP451(LineEndingTest):
def load(self, loader, module_name):
module = types.ModuleType(module_name)
module.__spec__ = importlib.util.spec_from_loader(module_name, loader)
loader.exec_module(module)
return module
(Frozen_LineEndingTestPEP451,
Source_LineEndingTestPEP451
) = util.test_both(LineEndingTestPEP451, machinery=machinery)
class LineEndingTestPEP302(LineEndingTest):
def load(self, loader, module_name):
with warnings.catch_warnings():
warnings.simplefilter('ignore', DeprecationWarning)
return loader.load_module(module_name)
(Frozen_LineEndingTestPEP302,
Source_LineEndingTestPEP302
) = util.test_both(LineEndingTestPEP302, machinery=machinery)
if __name__ == '__main__':
unittest.main()
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