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# coding: utf-8
"""
Exposes functionality needed throughout the project.
"""
from sys import version_info
def _get_string_types():
# TODO: come up with a better solution for this. One of the issues here
# is that in Python 3 there is no common base class for unicode strings
# and byte strings, and 2to3 seems to convert all of "str", "unicode",
# and "basestring" to Python 3's "str".
if version_info < (3, ):
return str
# The latter evaluates to "bytes" in Python 3 -- even after conversion by 2to3.
return (str, type("a".encode('utf-8')))
_STRING_TYPES = _get_string_types()
def is_string(obj):
"""
Return whether the given object is a byte string or unicode string.
This function is provided for compatibility with both Python 2 and 3
when using 2to3.
"""
return isinstance(obj, _STRING_TYPES)
# This function was designed to be portable across Python versions -- both
# with older versions and with Python 3 after applying 2to3.
def read(path):
"""
Return the contents of a text file as a byte string.
"""
# Opening in binary mode is necessary for compatibility across Python
# 2 and 3. In both Python 2 and 3, open() defaults to opening files in
# text mode. However, in Python 2, open() returns file objects whose
# read() method returns byte strings (strings of type `str` in Python 2),
# whereas in Python 3, the file object returns unicode strings (strings
# of type `str` in Python 3).
f = open(path, 'rb')
# We avoid use of the with keyword for Python 2.4 support.
try:
return f.read()
finally:
f.close()
class MissingTags(object):
"""Contains the valid values for Renderer.missing_tags."""
ignore = 'ignore'
strict = 'strict'
class PystacheError(Exception):
"""Base class for Pystache exceptions."""
pass
class TemplateNotFoundError(PystacheError):
"""An exception raised when a template is not found."""
pass