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# coding: utf-8
"""
This module provides a Reader class to read a template given a path.
"""
from __future__ import with_statement
import os
import sys
DEFAULT_DECODE_ERRORS = 'strict'
class Reader(object):
def __init__(self, encoding=None, decode_errors=None):
"""
Construct a template reader.
Arguments:
encoding: the file encoding. This is the name of the encoding to
use when converting file contents to unicode. This name is
passed as the encoding argument to Python's built-in function
unicode(). Defaults to the encoding name returned by
sys.getdefaultencoding().
decode_errors: the string to pass as the errors argument to the
built-in function unicode() when converting file contents to
unicode. Defaults to "strict".
"""
if decode_errors is None:
decode_errors = DEFAULT_DECODE_ERRORS
if encoding is None:
encoding = sys.getdefaultencoding()
self.decode_errors = decode_errors
self.encoding = encoding
def unicode(self, s, encoding=None):
"""
Call Python's built-in function unicode(), and return the result.
For unicode strings (or unicode subclasses), this function calls
Python's unicode() without the encoding and errors arguments.
Thus, unlike Python's built-in unicode(), it is okay to pass unicode
strings to this function. (Passing a unicode string to Python's
unicode() with the encoding argument throws the following
error: "TypeError: decoding Unicode is not supported.")
"""
if isinstance(s, unicode):
return unicode(s)
if encoding is None:
encoding = self.encoding
return unicode(s, encoding, self.decode_errors)
def read(self, path, encoding=None):
"""
Read the template at the given path, and return it as a unicode string.
"""
with open(path, 'r') as f:
text = f.read()
return self.unicode(text, encoding)
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