# HG changeset patch
# User Wagner Bruna <wbruna@softwareexpress.com.br>
# Date 2011-10-17 13:54:12
# Node ID e40430fb787baf257d87e66782fa09ea418e27cd
# Parent  9cec4b24615b682e5a17b2f83243db49e92eef6e

i18n: import polib 0.6.4 (rev 84598f2b5365)

This version fixes some upstream issues observed during the pt_BR
translation update: #8 (obsolete entries reappearing); an
unidentified issue that made i18n/posplit produce some spurious
messages on the resulting po file; possibly others.

These bugs probably didn't cause actual differences on the translated
output, since an invalid message added to the .mo file wouldn't match
an input message most of the time. But they do pollute the .po file
contents (and diffs), adding some confusion to the translation
process.

db957a72fbd7, 4c50552fc9bc and 8ea51e9e7031 were included upstream,
so the only remaining difference is the "no-check-code" marking.

diff --git a/i18n/polib.py b/i18n/polib.py
--- a/i18n/polib.py
+++ b/i18n/polib.py
@@ -5,113 +5,48 @@
 # vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4:
 
 """
-**polib** allows you to manipulate, create, modify gettext files (pot, po
-and mo files).  You can load existing files, iterate through it's entries,
-add, modify entries, comments or metadata, etc... or create new po files
-from scratch.
-
-**polib** provides a simple and pythonic API, exporting only three
-convenience functions (*pofile*, *mofile* and *detect_encoding*), and the
-four core classes, *POFile*, *MOFile*, *POEntry* and *MOEntry* for creating
-new files/entries.
-
-**Basic example**:
+**polib** allows you to manipulate, create, modify gettext files (pot, po and
+mo files).  You can load existing files, iterate through it's entries, add,
+modify entries, comments or metadata, etc. or create new po files from scratch.
 
->>> import polib
->>> # load an existing po file
->>> po = polib.pofile('tests/test_utf8.po')
->>> for entry in po:
-...     # do something with entry...
-...     pass
->>> # add an entry
->>> entry = polib.POEntry(msgid='Welcome', msgstr='Bienvenue')
->>> entry.occurrences = [('welcome.py', '12'), ('anotherfile.py', '34')]
->>> po.append(entry)
->>> # to save our modified po file:
->>> # po.save()
->>> # or you may want to compile the po file
->>> # po.save_as_mofile('tests/test_utf8.mo')
+**polib** provides a simple and pythonic API via the :func:`~polib.pofile` and
+:func:`~polib.mofile` convenience functions.
 """
 
-__author__    = 'David JEAN LOUIS <izimobil@gmail.com>'
-__version__   = '0.5.2'
+__author__    = 'David Jean Louis <izimobil@gmail.com>'
+__version__   = '0.6.4'
 __all__       = ['pofile', 'POFile', 'POEntry', 'mofile', 'MOFile', 'MOEntry',
                  'detect_encoding', 'escape', 'unescape', 'detect_encoding',]
 
+import array
 import codecs
+import os
+import re
 import struct
+import sys
 import textwrap
 import types
-import re
+
 
+# the default encoding to use when encoding cannot be detected
 default_encoding = 'utf-8'
 
-# function pofile() {{{
-
-def pofile(fpath, **kwargs):
-    """
-    Convenience function that parse the po/pot file *fpath* and return
-    a POFile instance.
-
-    **Keyword arguments**:
-      - *fpath*: string, full or relative path to the po/pot file to parse
-      - *wrapwidth*: integer, the wrap width, only useful when -w option was
-        passed to xgettext (optional, default to 78)
-      - *autodetect_encoding*: boolean, if set to False the function will
-        not try to detect the po file encoding (optional, default to True)
-      - *encoding*: string, an encoding, only relevant if autodetect_encoding
-        is set to False
-      - *check_for_duplicates*: whether to check for duplicate entries when
-        adding entries to the file, default: False (optional)
-
-    **Example**:
+# _pofile_or_mofile {{{
 
-    >>> import polib
-    >>> po = polib.pofile('tests/test_weird_occurrences.po',
-    ...     check_for_duplicates=True)
-    >>> po #doctest: +ELLIPSIS
-    <POFile instance at ...>
-    >>> import os, tempfile
-    >>> all_attrs = ('msgctxt', 'msgid', 'msgstr', 'msgid_plural', 
-    ...              'msgstr_plural', 'obsolete', 'comment', 'tcomment', 
-    ...              'occurrences', 'flags', 'previous_msgctxt', 
-    ...              'previous_msgid', 'previous_msgid_plural')
-    >>> for fname in ['test_iso-8859-15.po', 'test_utf8.po']:
-    ...     orig_po = polib.pofile('tests/'+fname)
-    ...     tmpf = tempfile.NamedTemporaryFile().name
-    ...     orig_po.save(tmpf)
-    ...     try:
-    ...         new_po = polib.pofile(tmpf)
-    ...         for old, new in zip(orig_po, new_po):
-    ...             for attr in all_attrs:
-    ...                 if getattr(old, attr) != getattr(new, attr):
-    ...                     getattr(old, attr)
-    ...                     getattr(new, attr)
-    ...     finally:
-    ...         os.unlink(tmpf)
-    >>> po_file = polib.pofile('tests/test_save_as_mofile.po')
-    >>> tmpf = tempfile.NamedTemporaryFile().name
-    >>> po_file.save_as_mofile(tmpf)
-    >>> try:
-    ...     mo_file = polib.mofile(tmpf)
-    ...     for old, new in zip(po_file, mo_file):
-    ...         if po_file._encode(old.msgid) != mo_file._encode(new.msgid):
-    ...             'OLD: ', po_file._encode(old.msgid)
-    ...             'NEW: ', mo_file._encode(new.msgid)
-    ...         if po_file._encode(old.msgstr) != mo_file._encode(new.msgstr):
-    ...             'OLD: ', po_file._encode(old.msgstr)
-    ...             'NEW: ', mo_file._encode(new.msgstr)
-    ...             print new.msgstr
-    ... finally:
-    ...     os.unlink(tmpf)
+def _pofile_or_mofile(f, type, **kwargs):
+    """
+    Internal function used by :func:`polib.pofile` and :func:`polib.mofile` to
+    honor the DRY concept.
     """
-    if kwargs.get('autodetect_encoding', True):
-        enc = detect_encoding(fpath)
-    else:
-        enc = kwargs.get('encoding', default_encoding)
-    check_for_duplicates = kwargs.get('check_for_duplicates', False)
-    parser = _POFileParser(
-        fpath,
+    # get the file encoding
+    enc = kwargs.get('encoding')
+    if enc is None:
+        enc = detect_encoding(f, type == 'mofile')
+
+    # parse the file
+    kls = type == 'pofile' and _POFileParser or _MOFileParser
+    parser = kls(
+        f,
         encoding=enc,
         check_for_duplicates=kwargs.get('check_for_duplicates', False)
     )
@@ -120,95 +55,108 @@ def pofile(fpath, **kwargs):
     return instance
 
 # }}}
+# function pofile() {{{
+
+def pofile(pofile, **kwargs):
+    """
+    Convenience function that parses the po or pot file ``pofile`` and returns
+    a :class:`~polib.POFile` instance.
+
+    Arguments:
+
+    ``pofile``
+        string, full or relative path to the po/pot file or its content (data).
+
+    ``wrapwidth``
+        integer, the wrap width, only useful when the ``-w`` option was passed
+        to xgettext (optional, default: ``78``).
+
+    ``encoding``
+        string, the encoding to use (e.g. "utf-8") (default: ``None``, the
+        encoding will be auto-detected).
+
+    ``check_for_duplicates``
+        whether to check for duplicate entries when adding entries to the
+        file (optional, default: ``False``).
+    """
+    return _pofile_or_mofile(pofile, 'pofile', **kwargs)
+
+# }}}
 # function mofile() {{{
 
-def mofile(fpath, **kwargs):
+def mofile(mofile, **kwargs):
     """
-    Convenience function that parse the mo file *fpath* and return
-    a MOFile instance.
+    Convenience function that parses the mo file ``mofile`` and returns a
+    :class:`~polib.MOFile` instance.
 
-    **Keyword arguments**:
-      - *fpath*: string, full or relative path to the mo file to parse
-      - *wrapwidth*: integer, the wrap width, only useful when -w option was
-        passed to xgettext to generate the po file that was used to format
-        the mo file (optional, default to 78)
-      - *autodetect_encoding*: boolean, if set to False the function will
-        not try to detect the po file encoding (optional, default to True)
-      - *encoding*: string, an encoding, only relevant if autodetect_encoding
-        is set to False
-      - *check_for_duplicates*: whether to check for duplicate entries when
-        adding entries to the file, default: False (optional)
+    Arguments:
 
-    **Example**:
+    ``mofile``
+        string, full or relative path to the mo file or its content (data).
 
-    >>> import polib
-    >>> mo = polib.mofile('tests/test_utf8.mo', check_for_duplicates=True)
-    >>> mo #doctest: +ELLIPSIS
-    <MOFile instance at ...>
-    >>> import os, tempfile
-    >>> for fname in ['test_iso-8859-15.mo', 'test_utf8.mo']:
-    ...     orig_mo = polib.mofile('tests/'+fname)
-    ...     tmpf = tempfile.NamedTemporaryFile().name
-    ...     orig_mo.save(tmpf)
-    ...     try:
-    ...         new_mo = polib.mofile(tmpf)
-    ...         for old, new in zip(orig_mo, new_mo):
-    ...             if old.msgid != new.msgid:
-    ...                 old.msgstr
-    ...                 new.msgstr
-    ...     finally:
-    ...         os.unlink(tmpf)
+    ``wrapwidth``
+        integer, the wrap width, only useful when the ``-w`` option was passed
+        to xgettext to generate the po file that was used to format the mo file
+        (optional, default: ``78``).
+
+    ``encoding``
+        string, the encoding to use (e.g. "utf-8") (default: ``None``, the
+        encoding will be auto-detected).
+
+    ``check_for_duplicates``
+        whether to check for duplicate entries when adding entries to the
+        file (optional, default: ``False``).
     """
-    if kwargs.get('autodetect_encoding', True):
-        enc = detect_encoding(fpath, True)
-    else:
-        enc = kwargs.get('encoding', default_encoding)
-    parser = _MOFileParser(
-        fpath,
-        encoding=enc,
-        check_for_duplicates=kwargs.get('check_for_duplicates', False)
-    )
-    instance = parser.parse()
-    instance.wrapwidth = kwargs.get('wrapwidth', 78)
-    return instance
+    return _pofile_or_mofile(mofile, 'mofile', **kwargs)
 
 # }}}
 # function detect_encoding() {{{
 
-def detect_encoding(fpath, binary_mode=False):
+def detect_encoding(file, binary_mode=False):
     """
-    Try to detect the encoding used by the file *fpath*. The function will
-    return polib default *encoding* if it's unable to detect it.
+    Try to detect the encoding used by the ``file``. The ``file`` argument can
+    be a PO or MO file path or a string containing the contents of the file.
+    If the encoding cannot be detected, the function will return the value of
+    ``default_encoding``.
 
-    **Keyword argument**:
-      - *fpath*: string, full or relative path to the mo file to parse.
+    Arguments:
+
+    ``file``
+        string, full or relative path to the po/mo file or its content.
 
-    **Examples**:
+    ``binary_mode``
+        boolean, set this to True if ``file`` is a mo file.
+    """
+    rx = re.compile(r'"?Content-Type:.+? charset=([\w_\-:\.]+)')
 
-    >>> print(detect_encoding('tests/test_noencoding.po'))
-    utf-8
-    >>> print(detect_encoding('tests/test_utf8.po'))
-    UTF-8
-    >>> print(detect_encoding('tests/test_utf8.mo', True))
-    UTF-8
-    >>> print(detect_encoding('tests/test_iso-8859-15.po'))
-    ISO_8859-15
-    >>> print(detect_encoding('tests/test_iso-8859-15.mo', True))
-    ISO_8859-15
-    """
-    import re
-    rx = re.compile(r'"?Content-Type:.+? charset=([\w_\-:\.]+)')
-    if binary_mode:
-        mode = 'rb'
+    def charset_exists(charset):
+        """Check whether ``charset`` is valid or not."""
+        try:
+            codecs.lookup(charset)
+        except LookupError:
+            return False
+        return True
+
+    if not os.path.exists(file):
+        match = rx.search(file)
+        if match:
+            enc = match.group(1).strip()
+            if charset_exists(enc):
+                return enc
     else:
-        mode = 'r'
-    f = open(fpath, mode)
-    for l in f.readlines():
-        match = rx.search(l)
-        if match:
-            f.close()
-            return match.group(1).strip()
-    f.close()
+        if binary_mode:
+            mode = 'rb'
+        else:
+            mode = 'r'
+        f = open(file, mode)
+        for l in f.readlines():
+            match = rx.search(l)
+            if match:
+                f.close()
+                enc = match.group(1).strip()
+                if charset_exists(enc):
+                    return enc
+        f.close()
     return default_encoding
 
 # }}}
@@ -216,12 +164,8 @@ def detect_encoding(fpath, binary_mode=F
 
 def escape(st):
     """
-    Escape special chars and return the given string *st*.
-
-    **Examples**:
-
-    >>> escape('\\t and \\n and \\r and " and \\\\')
-    '\\\\t and \\\\n and \\\\r and \\\\" and \\\\\\\\'
+    Escapes the characters ``\\\\``, ``\\t``, ``\\n``, ``\\r`` and ``"`` in
+    the given string ``st`` and returns it.
     """
     return st.replace('\\', r'\\')\
              .replace('\t', r'\t')\
@@ -234,18 +178,8 @@ def escape(st):
 
 def unescape(st):
     """
-    Unescape special chars and return the given string *st*.
-
-    **Examples**:
-
-    >>> unescape('\\\\t and \\\\n and \\\\r and \\\\" and \\\\\\\\')
-    '\\t and \\n and \\r and " and \\\\'
-    >>> unescape(r'\\n')
-    '\\n'
-    >>> unescape(r'\\\\n')
-    '\\\\n'
-    >>> unescape(r'\\\\n\\n')
-    '\\\\n\\n'
+    Unescapes the characters ``\\\\``, ``\\t``, ``\\n``, ``\\r`` and ``"`` in
+    the given string ``st`` and returns it.
     """
     def unescape_repl(m):
         m = m.group(1)
@@ -265,27 +199,36 @@ def unescape(st):
 
 class _BaseFile(list):
     """
-    Common parent class for POFile and MOFile classes.
-    This class must **not** be instanciated directly.
+    Common base class for the :class:`~polib.POFile` and :class:`~polib.MOFile`
+    classes. This class should **not** be instanciated directly.
     """
 
     def __init__(self, *args, **kwargs):
         """
-        Constructor.
+        Constructor, accepts the following keyword arguments:
+
+        ``pofile``
+            string, the path to the po or mo file, or its content as a string.
 
-        **Keyword arguments**:
-          - *fpath*: string, path to po or mo file
-          - *wrapwidth*: integer, the wrap width, only useful when -w option
-            was passed to xgettext to generate the po file that was used to
-            format the mo file, default to 78 (optional),
-          - *encoding*: string, the encoding to use, defaults to
-            "default_encoding" global variable (optional),
-          - *check_for_duplicates*: whether to check for duplicate entries
-            when adding entries to the file, default: False (optional).
+        ``wrapwidth``
+            integer, the wrap width, only useful when the ``-w`` option was
+            passed to xgettext (optional, default: ``78``).
+
+        ``encoding``
+            string, the encoding to use, defaults to ``default_encoding``
+            global variable (optional).
+
+        ``check_for_duplicates``
+            whether to check for duplicate entries when adding entries to the
+            file, (optional, default: ``False``).
         """
         list.__init__(self)
         # the opened file handle
-        self.fpath = kwargs.get('fpath')
+        pofile = kwargs.get('pofile', None)
+        if pofile and os.path.exists(pofile):
+            self.fpath = pofile
+        else:
+            self.fpath = kwargs.get('fpath')
         # the width at which lines should be wrapped
         self.wrapwidth = kwargs.get('wrapwidth', 78)
         # the file encoding
@@ -298,66 +241,56 @@ class _BaseFile(list):
         self.metadata = {}
         self.metadata_is_fuzzy = 0
 
-    def __str__(self):
+    def __unicode__(self):
         """
-        String representation of the file.
+        Returns the unicode representation of the file.
         """
         ret = []
         entries = [self.metadata_as_entry()] + \
                   [e for e in self if not e.obsolete]
         for entry in entries:
-            ret.append(entry.__str__(self.wrapwidth))
+            ret.append(entry.__unicode__(self.wrapwidth))
         for entry in self.obsolete_entries():
-            ret.append(entry.__str__(self.wrapwidth))
-        return '\n'.join(ret)
+            ret.append(entry.__unicode__(self.wrapwidth))
+        ret = '\n'.join(ret)
+
+        if type(ret) != types.UnicodeType:
+            return unicode(ret, self.encoding)
+        return ret
+
+    def __str__(self):
+        """
+        Returns the string representation of the file.
+        """
+        return unicode(self).encode(self.encoding)
 
     def __contains__(self, entry):
         """
-        Overriden method to implement the membership test (in and not in).
-        The method considers that an entry is in the file if it finds an 
-        entry that has the same msgid (case sensitive).
-
-        **Keyword argument**:
-          - *entry*: an instance of polib._BaseEntry
+        Overriden ``list`` method to implement the membership test (in and
+        not in).
+        The method considers that an entry is in the file if it finds an entry
+        that has the same msgid (the test is **case sensitive**).
 
-        **Tests**:
-        >>> po = POFile()
-        >>> e1 = POEntry(msgid='foobar', msgstr='spam')
-        >>> e2 = POEntry(msgid='barfoo', msgstr='spam')
-        >>> e3 = POEntry(msgid='foobar', msgstr='eggs')
-        >>> e4 = POEntry(msgid='spameggs', msgstr='eggs')
-        >>> po.append(e1)
-        >>> po.append(e2)
-        >>> e1 in po
-        True
-        >>> e2 not in po
-        False
-        >>> e3 in po
-        True
-        >>> e4 in po
-        False
+        Argument:
+
+        ``entry``
+            an instance of :class:`~polib._BaseEntry`.
         """
         return self.find(entry.msgid, by='msgid') is not None
+    
+    def __eq__(self, other):
+        return unicode(self) == unicode(other)
 
     def append(self, entry):
         """
         Overriden method to check for duplicates entries, if a user tries to
-        add an entry that already exists, the method will raise a ValueError
-        exception.
-
-        **Keyword argument**:
-          - *entry*: an instance of polib._BaseEntry
+        add an entry that is already in the file, the method will raise a
+        ``ValueError`` exception.
 
-        **Tests**:
-        >>> e1 = POEntry(msgid='foobar', msgstr='spam')
-        >>> e2 = POEntry(msgid='foobar', msgstr='eggs')
-        >>> po = POFile(check_for_duplicates=True)
-        >>> po.append(e1)
-        >>> try:
-        ...     po.append(e2)
-        ... except ValueError, e:
-        ...     unicode(e)
-        u'Entry "foobar" already exists'
+        Argument:
+
+        ``entry``
+            an instance of :class:`~polib._BaseEntry`.
         """
         if self.check_for_duplicates and entry in self:
             raise ValueError('Entry "%s" already exists' % entry.msgid)
@@ -366,70 +299,50 @@ class _BaseFile(list):
     def insert(self, index, entry):
         """
         Overriden method to check for duplicates entries, if a user tries to
-        insert an entry that already exists, the method will raise a ValueError
-        exception.
+        add an entry that is already in the file, the method will raise a
+        ``ValueError`` exception.
 
-        **Keyword arguments**:
-          - *index*: index at which the entry should be inserted
-          - *entry*: an instance of polib._BaseEntry
+        Arguments:
 
-        **Tests**:
-        >>> import polib
-        >>> polib.check_for_duplicates = True
-        >>> e1 = POEntry(msgid='foobar', msgstr='spam')
-        >>> e2 = POEntry(msgid='barfoo', msgstr='eggs')
-        >>> e3 = POEntry(msgid='foobar', msgstr='eggs')
-        >>> po = POFile(check_for_duplicates=True)
-        >>> po.insert(0, e1)
-        >>> po.insert(1, e2)
-        >>> try:
-        ...     po.insert(0, e3)
-        ... except ValueError, e:
-        ...     unicode(e)
-        u'Entry "foobar" already exists'
+        ``index``
+            index at which the entry should be inserted.
+
+        ``entry``
+            an instance of :class:`~polib._BaseEntry`.
         """
         if self.check_for_duplicates and entry in self:
             raise ValueError('Entry "%s" already exists' % entry.msgid)
         super(_BaseFile, self).insert(index, entry)
 
-    def __repr__(self):
-        """Return the official string representation of the object."""
-        return '<%s instance at %x>' % (self.__class__.__name__, id(self))
-
     def metadata_as_entry(self):
         """
-        Return the metadata as an entry:
-
-        >>> import polib
-        >>> po = polib.pofile('tests/test_fuzzy_header.po')
-        >>> unicode(po) == unicode(open('tests/test_fuzzy_header.po').read())
-        True
+        Returns the file metadata as a :class:`~polib.POFile` instance.
         """
         e = POEntry(msgid='')
         mdata = self.ordered_metadata()
         if mdata:
             strs = []
-            e._multiline_str['msgstr'] = ''
             for name, value in mdata:
                 # Strip whitespace off each line in a multi-line entry
                 strs.append('%s: %s' % (name, value))
             e.msgstr = '\n'.join(strs) + '\n'
-            e._multiline_str['msgstr'] = '__POLIB__NL__'.join(
-                    [s + '\n' for s in strs])
         if self.metadata_is_fuzzy:
             e.flags.append('fuzzy')
         return e
 
     def save(self, fpath=None, repr_method='__str__'):
         """
-        Save the po file to file *fpath* if no file handle exists for
-        the object. If there's already an open file and no fpath is
-        provided, then the existing file is rewritten with the modified
-        data.
+        Saves the po file to ``fpath``.
+        If it is an existing file and no ``fpath`` is provided, then the
+        existing file is rewritten with the modified data.
+
+        Keyword arguments:
 
-        **Keyword arguments**:
-          - *fpath*: string, full or relative path to the file.
-          - *repr_method*: string, the method to use for output.
+        ``fpath``
+            string, full or relative path to the file.
+
+        ``repr_method``
+            string, the method to use for output.
         """
         if self.fpath is None and fpath is None:
             raise IOError('You must provide a file path to save() method')
@@ -444,38 +357,47 @@ class _BaseFile(list):
                 contents = contents.decode(self.encoding)
         fhandle.write(contents)
         fhandle.close()
-
-    def find(self, st, by='msgid'):
-        """
-        Find entry which msgid (or property identified by the *by*
-        attribute) matches the string *st*.
+        # set the file path if not set
+        if self.fpath is None and fpath:
+            self.fpath = fpath
 
-        **Keyword arguments**:
-          - *st*: string, the string to search for
-          - *by*: string, the comparison attribute
+    def find(self, st, by='msgid', include_obsolete_entries=False,
+             msgctxt=False):
+        """
+        Find the entry which msgid (or property identified by the ``by``
+        argument) matches the string ``st``.
 
-        **Examples**:
+        Keyword arguments:
+
+        ``st``
+            string, the string to search for.
 
-        >>> po = pofile('tests/test_utf8.po')
-        >>> entry = po.find('Thursday')
-        >>> entry.msgstr
-        u'Jueves'
-        >>> entry = po.find('Some unexistant msgid')
-        >>> entry is None
-        True
-        >>> entry = po.find('Jueves', 'msgstr')
-        >>> entry.msgid
-        u'Thursday'
+        ``by``
+            string, the property to use for comparison (default: ``msgid``).
+
+        ``include_obsolete_entries``
+            boolean, whether to also search in entries that are obsolete.
+
+        ``msgctxt``
+            string, allows to specify a specific message context for the
+            search.
         """
-        for e in self:
+        if include_obsolete_entries:
+            entries = self[:]
+        else:
+            entries = [e for e in self if not e.obsolete]
+        for e in entries:
             if getattr(e, by) == st:
+                if msgctxt and e.msgctxt != msgctxt:
+                    continue
                 return e
         return None
 
     def ordered_metadata(self):
         """
-        Convenience method that return the metadata ordered. The return
-        value is list of tuples (metadata name, metadata_value).
+        Convenience method that returns an ordered version of the metadata
+        dictionnary. The return value is list of tuples (metadata name,
+        metadata_value).
         """
         # copy the dict first
         metadata = self.metadata.copy()
@@ -497,9 +419,10 @@ class _BaseFile(list):
                 ordered_data.append((data, value))
             except KeyError:
                 pass
-        # the rest of the metadata won't be ordered there are no specs for this
+        # the rest of the metadata will be alphabetically ordered since there
+        # are no specs for this AFAIK
         keys = metadata.keys()
-        list(keys).sort()
+        keys.sort()
         for data in keys:
             value = metadata[data]
             ordered_data.append((data, value))
@@ -507,45 +430,51 @@ class _BaseFile(list):
 
     def to_binary(self):
         """
-        Return the mofile binary representation.
+        Return the binary representation of the file.
         """
-        import array
-        import struct
-        import types
         offsets = []
         entries = self.translated_entries()
         # the keys are sorted in the .mo file
         def cmp(_self, other):
-            if _self.msgid > other.msgid:
+            # msgfmt compares entries with msgctxt if it exists
+            self_msgid = _self.msgctxt and _self.msgctxt or _self.msgid
+            other_msgid = other.msgctxt and other.msgctxt or other.msgid
+            if self_msgid > other_msgid:
                 return 1
-            elif _self.msgid < other.msgid:
+            elif self_msgid < other_msgid:
                 return -1
             else:
                 return 0
         # add metadata entry
         entries.sort(cmp)
         mentry = self.metadata_as_entry()
-        mentry.msgstr = mentry.msgstr.replace('\\n', '').lstrip()
+        #mentry.msgstr = mentry.msgstr.replace('\\n', '').lstrip()
         entries = [mentry] + entries
         entries_len = len(entries)
         ids, strs = '', ''
         for e in entries:
             # For each string, we need size and file offset.  Each string is
             # NUL terminated; the NUL does not count into the size.
+            msgid = ''
+            if e.msgctxt:
+                # Contexts are stored by storing the concatenation of the
+                # context, a <EOT> byte, and the original string
+                msgid = self._encode(e.msgctxt + '\4')
             if e.msgid_plural:
                 indexes = e.msgstr_plural.keys()
                 indexes.sort()
                 msgstr = []
                 for index in indexes:
                     msgstr.append(e.msgstr_plural[index])
-                msgid = self._encode(e.msgid + '\0' + e.msgid_plural)
+                msgid += self._encode(e.msgid + '\0' + e.msgid_plural)
                 msgstr = self._encode('\0'.join(msgstr))
             else:
-                msgid = self._encode(e.msgid)
+                msgid += self._encode(e.msgid)
                 msgstr = self._encode(e.msgstr)
             offsets.append((len(ids), len(msgid), len(strs), len(msgstr)))
             ids  += msgid  + '\0'
             strs += msgstr + '\0'
+
         # The header is 7 32-bit unsigned integers.
         keystart = 7*4+16*entries_len
         # and the values start after the keys
@@ -558,22 +487,31 @@ class _BaseFile(list):
             koffsets += [l1, o1+keystart]
             voffsets += [l2, o2+valuestart]
         offsets = koffsets + voffsets
-        output  = struct.pack("IIIIIII",
-                             0x950412de,        # Magic number
-                             0,                 # Version
-                             entries_len,       # # of entries
-                             7*4,               # start of key index
-                             7*4+entries_len*8, # start of value index
-                             0, 0)              # size and offset of hash table
-        output += array.array("I", offsets).tostring()
+        # check endianness for magic number
+        if struct.pack('@h', 1) == struct.pack('<h', 1):
+            magic_number = MOFile.LITTLE_ENDIAN
+        else:
+            magic_number = MOFile.BIG_ENDIAN
+
+        output = struct.pack(
+            "Iiiiiii",
+            magic_number,      # Magic number
+            0,                 # Version
+            entries_len,       # # of entries
+            7*4,               # start of key index
+            7*4+entries_len*8, # start of value index
+            0, keystart        # size and offset of hash table
+                               # Important: we don't use hash tables
+        )              
+        output += array.array("i", offsets).tostring()
         output += ids
         output += strs
         return output
 
     def _encode(self, mixed):
         """
-        Encode the given argument with the file encoding if the type is unicode
-        and return the encoded string.
+        Encodes the given ``mixed`` argument with the file encoding if and
+        only if it's an unicode string and returns the encoded string.
         """
         if type(mixed) == types.UnicodeType:
             return mixed.encode(self.encoding)
@@ -583,88 +521,43 @@ class _BaseFile(list):
 # class POFile {{{
 
 class POFile(_BaseFile):
-    '''
+    """
     Po (or Pot) file reader/writer.
-    POFile objects inherit the list objects methods.
-
-    **Example**:
+    This class inherits the :class:`~polib._BaseFile` class and, by extension,
+    the python ``list`` type.
+    """
 
-    >>> po = POFile()
-    >>> entry1 = POEntry(
-    ...     msgid="Some english text",
-    ...     msgstr="Un texte en anglais"
-    ... )
-    >>> entry1.occurrences = [('testfile', 12),('another_file', 1)]
-    >>> entry1.comment = "Some useful comment"
-    >>> entry2 = POEntry(
-    ...     msgid="Peace in some languages",
-    ...     msgstr="Pace سلام שלום Hasîtî 和平"
-    ... )
-    >>> entry2.occurrences = [('testfile', 15),('another_file', 5)]
-    >>> entry2.comment = "Another useful comment"
-    >>> entry3 = POEntry(
-    ...     msgid='Some entry with quotes " \\"',
-    ...     msgstr='Un message unicode avec des quotes " \\"'
-    ... )
-    >>> entry3.comment = "Test string quoting"
-    >>> po.append(entry1)
-    >>> po.append(entry2)
-    >>> po.append(entry3)
-    >>> po.header = "Some Header"
-    >>> print(po)
-    # Some Header
-    msgid ""
-    msgstr ""
-    <BLANKLINE>
-    #. Some useful comment
-    #: testfile:12 another_file:1
-    msgid "Some english text"
-    msgstr "Un texte en anglais"
-    <BLANKLINE>
-    #. Another useful comment
-    #: testfile:15 another_file:5
-    msgid "Peace in some languages"
-    msgstr "Pace سلام שלום Hasîtî 和平"
-    <BLANKLINE>
-    #. Test string quoting
-    msgid "Some entry with quotes \\" \\""
-    msgstr "Un message unicode avec des quotes \\" \\""
-    <BLANKLINE>
-    '''
-
-    def __str__(self):
-        """Return the string representation of the po file"""
+    def __unicode__(self):
+        """
+        Returns the unicode representation of the po file.
+        """
         ret, headers = '', self.header.split('\n')
         for header in headers:
             if header[:1] in [',', ':']:
                 ret += '#%s\n' % header
             else:
                 ret += '# %s\n' % header
-        return ret + _BaseFile.__str__(self)
+
+        if type(ret) != types.UnicodeType:
+            ret = unicode(ret, self.encoding)
+
+        return ret + _BaseFile.__unicode__(self)
 
     def save_as_mofile(self, fpath):
         """
-        Save the binary representation of the file to *fpath*.
+        Saves the binary representation of the file to given ``fpath``.
 
-        **Keyword arguments**:
-          - *fpath*: string, full or relative path to the file.
+        Keyword argument:
+
+        ``fpath``
+            string, full or relative path to the mo file.
         """
         _BaseFile.save(self, fpath, 'to_binary')
 
     def percent_translated(self):
         """
-        Convenience method that return the percentage of translated
+        Convenience method that returns the percentage of translated
         messages.
-
-        **Example**:
-
-        >>> import polib
-        >>> po = polib.pofile('tests/test_pofile_helpers.po')
-        >>> po.percent_translated()
-        50
-        >>> po = POFile()
-        >>> po.percent_translated()
-        100
         """
         total = len([e for e in self if not e.obsolete])
         if total == 0:
@@ -674,91 +567,52 @@ class POFile(_BaseFile):
 
     def translated_entries(self):
         """
-        Convenience method that return a list of translated entries.
-
-        **Example**:
-
-        >>> import polib
-        >>> po = polib.pofile('tests/test_pofile_helpers.po')
-        >>> len(po.translated_entries())
-        6
+        Convenience method that returns the list of translated entries.
         """
         return [e for e in self if e.translated()]
 
     def untranslated_entries(self):
         """
-        Convenience method that return a list of untranslated entries.
-
-        **Example**:
-
-        >>> import polib
-        >>> po = polib.pofile('tests/test_pofile_helpers.po')
-        >>> len(po.untranslated_entries())
-        4
+        Convenience method that returns the list of untranslated entries.
         """
         return [e for e in self if not e.translated() and not e.obsolete \
                 and not 'fuzzy' in e.flags]
 
     def fuzzy_entries(self):
         """
-        Convenience method that return the list of 'fuzzy' entries.
-
-        **Example**:
-
-        >>> import polib
-        >>> po = polib.pofile('tests/test_pofile_helpers.po')
-        >>> len(po.fuzzy_entries())
-        2
+        Convenience method that returns the list of fuzzy entries.
         """
         return [e for e in self if 'fuzzy' in e.flags]
 
     def obsolete_entries(self):
         """
-        Convenience method that return the list of obsolete entries.
-
-        **Example**:
-
-        >>> import polib
-        >>> po = polib.pofile('tests/test_pofile_helpers.po')
-        >>> len(po.obsolete_entries())
-        4
+        Convenience method that returns the list of obsolete entries.
         """
         return [e for e in self if e.obsolete]
 
     def merge(self, refpot):
         """
-        XXX this could not work if encodings are different, needs thinking
-        and general refactoring of how polib handles encoding...
-
-        Convenience method that merge the current pofile with the pot file
+        Convenience method that merges the current pofile with the pot file
         provided. It behaves exactly as the gettext msgmerge utility:
 
-          - comments of this file will be preserved, but extracted comments
-            and occurrences will be discarded
-          - any translations or comments in the file will be discarded,
-            however dot comments and file positions will be preserved
-
-        **Keyword argument**:
-          - *refpot*: object POFile, the reference catalog.
+        * comments of this file will be preserved, but extracted comments and
+          occurrences will be discarded;
+        * any translations or comments in the file will be discarded, however,
+          dot comments and file positions will be preserved;
+        * the fuzzy flags are preserved.
 
-        **Example**:
+        Keyword argument:
 
-        >>> import polib
-        >>> refpot = polib.pofile('tests/test_merge.pot')
-        >>> po = polib.pofile('tests/test_merge_before.po')
-        >>> po.merge(refpot)
-        >>> expected_po = polib.pofile('tests/test_merge_after.po')
-        >>> unicode(po) == unicode(expected_po)
-        True
+        ``refpot``
+            object POFile, the reference catalog.
         """
         for entry in refpot:
-            e = self.find(entry.msgid)
+            e = self.find(entry.msgid, include_obsolete_entries=True)
             if e is None:
                 e = POEntry()
                 self.append(e)
             e.merge(entry)
-        # ok, now we must "obsolete" entries that are not in the refpot
-        # anymore
+        # ok, now we must "obsolete" entries that are not in the refpot anymore
         for entry in self:
             if refpot.find(entry.msgid) is None:
                 entry.obsolete = True
@@ -767,48 +621,18 @@ class POFile(_BaseFile):
 # class MOFile {{{
 
 class MOFile(_BaseFile):
-    '''
+    """
     Mo file reader/writer.
-    MOFile objects inherit the list objects methods.
-
-    **Example**:
-
-    >>> mo = MOFile()
-    >>> entry1 = POEntry(
-    ...     msgid="Some english text",
-    ...     msgstr="Un texte en anglais"
-    ... )
-    >>> entry2 = POEntry(
-    ...     msgid="I need my dirty cheese",
-    ...     msgstr="Je veux mon sale fromage"
-    ... )
-    >>> entry3 = MOEntry(
-    ...     msgid='Some entry with quotes " \\"',
-    ...     msgstr='Un message unicode avec des quotes " \\"'
-    ... )
-    >>> mo.append(entry1)
-    >>> mo.append(entry2)
-    >>> mo.append(entry3)
-    >>> print(mo)
-    msgid ""
-    msgstr ""
-    <BLANKLINE>
-    msgid "Some english text"
-    msgstr "Un texte en anglais"
-    <BLANKLINE>
-    msgid "I need my dirty cheese"
-    msgstr "Je veux mon sale fromage"
-    <BLANKLINE>
-    msgid "Some entry with quotes \\" \\""
-    msgstr "Un message unicode avec des quotes \\" \\""
-    <BLANKLINE>
-    '''
+    This class inherits the :class:`~polib._BaseFile` class and, by
+    extension, the python ``list`` type.
+    """
+    BIG_ENDIAN    = 0xde120495
+    LITTLE_ENDIAN = 0x950412de
 
     def __init__(self, *args, **kwargs):
         """
-        MOFile constructor. Mo files have two other properties:
-            - magic_number: the magic_number of the binary file,
-            - version: the version of the mo spec.
+        Constructor, accepts all keywords arguments accepted by 
+        :class:`~polib._BaseFile` class.
         """
         _BaseFile.__init__(self, *args, **kwargs)
         self.magic_number = None
@@ -816,19 +640,23 @@ class MOFile(_BaseFile):
 
     def save_as_pofile(self, fpath):
         """
-        Save the string representation of the file to *fpath*.
+        Saves the mofile as a pofile to ``fpath``.
 
-        **Keyword argument**:
-          - *fpath*: string, full or relative path to the file.
+        Keyword argument:
+
+        ``fpath``
+            string, full or relative path to the file.
         """
         _BaseFile.save(self, fpath)
 
-    def save(self, fpath):
+    def save(self, fpath=None):
         """
-        Save the binary representation of the file to *fpath*.
+        Saves the mofile to ``fpath``.
 
-        **Keyword argument**:
-          - *fpath*: string, full or relative path to the file.
+        Keyword argument:
+
+        ``fpath``
+            string, full or relative path to the file.
         """
         _BaseFile.save(self, fpath, 'to_binary')
 
@@ -867,29 +695,47 @@ class MOFile(_BaseFile):
 
 class _BaseEntry(object):
     """
-    Base class for POEntry or MOEntry objects.
-    This class must *not* be instanciated directly.
+    Base class for :class:`~polib.POEntry` and :class:`~polib.MOEntry` classes.
+    This class should **not** be instanciated directly.
     """
 
     def __init__(self, *args, **kwargs):
-        """Base Entry constructor."""
+        """
+        Constructor, accepts the following keyword arguments:
+
+        ``msgid``
+            string, the entry msgid.
+
+        ``msgstr``
+            string, the entry msgstr.
+
+        ``msgid_plural``
+            string, the entry msgid_plural.
+
+        ``msgstr_plural``
+            list, the entry msgstr_plural lines.
+
+        ``msgctxt``
+            string, the entry context (msgctxt).
+
+        ``obsolete``
+            bool, whether the entry is "obsolete" or not.
+
+        ``encoding``
+            string, the encoding to use, defaults to ``default_encoding``
+            global variable (optional).
+        """
         self.msgid = kwargs.get('msgid', '')
         self.msgstr = kwargs.get('msgstr', '')
         self.msgid_plural = kwargs.get('msgid_plural', '')
         self.msgstr_plural = kwargs.get('msgstr_plural', {})
+        self.msgctxt = kwargs.get('msgctxt', None)
         self.obsolete = kwargs.get('obsolete', False)
         self.encoding = kwargs.get('encoding', default_encoding)
-        self.msgctxt = kwargs.get('msgctxt', None)
-        self._multiline_str = {}
 
-    def __repr__(self):
-        """Return the official string representation of the object."""
-        return '<%s instance at %x>' % (self.__class__.__name__, id(self))
-
-    def __str__(self, wrapwidth=78):
+    def __unicode__(self, wrapwidth=78):
         """
-        Common string representation of the POEntry and MOEntry
-        objects.
+        Returns the unicode representation of the entry.
         """
         if self.obsolete:
             delflag = '#~ '
@@ -898,12 +744,12 @@ class _BaseEntry(object):
         ret = []
         # write the msgctxt if any
         if self.msgctxt is not None:
-            ret += self._str_field("msgctxt", delflag, "", self.msgctxt)
+            ret += self._str_field("msgctxt", delflag, "", self.msgctxt, wrapwidth)
         # write the msgid
-        ret += self._str_field("msgid", delflag, "", self.msgid)
+        ret += self._str_field("msgid", delflag, "", self.msgid, wrapwidth)
         # write the msgid_plural if any
         if self.msgid_plural:
-            ret += self._str_field("msgid_plural", delflag, "", self.msgid_plural)
+            ret += self._str_field("msgid_plural", delflag, "", self.msgid_plural, wrapwidth)
         if self.msgstr_plural:
             # write the msgstr_plural if any
             msgstrs = self.msgstr_plural
@@ -912,23 +758,51 @@ class _BaseEntry(object):
             for index in keys:
                 msgstr = msgstrs[index]
                 plural_index = '[%s]' % index
-                ret += self._str_field("msgstr", delflag, plural_index, msgstr)
+                ret += self._str_field("msgstr", delflag, plural_index, msgstr, wrapwidth)
         else:
             # otherwise write the msgstr
-            ret += self._str_field("msgstr", delflag, "", self.msgstr)
+            ret += self._str_field("msgstr", delflag, "", self.msgstr, wrapwidth)
         ret.append('')
-        return '\n'.join(ret)
+        ret = '\n'.join(ret)
+
+        if type(ret) != types.UnicodeType:
+            return unicode(ret, self.encoding)
+        return ret
+
+    def __str__(self):
+        """
+        Returns the string representation of the entry.
+        """
+        return unicode(self).encode(self.encoding)
+    
+    def __eq__(self, other):
+        return unicode(self) == unicode(other)
 
-    def _str_field(self, fieldname, delflag, plural_index, field):
-        if (fieldname + plural_index) in self._multiline_str:
-            field = self._multiline_str[fieldname + plural_index]
-            lines = [''] + field.split('__POLIB__NL__')
+    def _str_field(self, fieldname, delflag, plural_index, field, wrapwidth=78):
+        lines = field.splitlines(True)
+        if len(lines) > 1:
+            lines = [''] + lines # start with initial empty line
         else:
-            lines = field.splitlines(True)
-            if len(lines) > 1:
-                lines = ['']+lines # start with initial empty line
+            escaped_field = escape(field)
+            specialchars_count = 0
+            for c in ['\\', '\n', '\r', '\t', '"']:
+                specialchars_count += field.count(c)
+            # comparison must take into account fieldname length + one space 
+            # + 2 quotes (eg. msgid "<string>")
+            flength = len(fieldname) + 3
+            if plural_index:
+                flength += len(plural_index)
+            real_wrapwidth = wrapwidth - flength + specialchars_count
+            if wrapwidth > 0 and len(field) > real_wrapwidth:
+                # Wrap the line but take field name into account
+                lines = [''] + [unescape(item) for item in wrap(
+                    escaped_field,
+                    wrapwidth - 2, # 2 for quotes ""
+                    drop_whitespace=False,
+                    break_long_words=False
+                )]
             else:
-                lines = [field] # needed for the empty string case
+                lines = [field]
         if fieldname.startswith('previous_'):
             # quick and dirty trick to get the real field name
             fieldname = fieldname[9:]
@@ -945,50 +819,33 @@ class _BaseEntry(object):
 class POEntry(_BaseEntry):
     """
     Represents a po file entry.
-
-    **Examples**:
-
-    >>> entry = POEntry(msgid='Welcome', msgstr='Bienvenue')
-    >>> entry.occurrences = [('welcome.py', 12), ('anotherfile.py', 34)]
-    >>> print(entry)
-    #: welcome.py:12 anotherfile.py:34
-    msgid "Welcome"
-    msgstr "Bienvenue"
-    <BLANKLINE>
-    >>> entry = POEntry()
-    >>> entry.occurrences = [('src/some-very-long-filename-that-should-not-be-wrapped-even-if-it-is-larger-than-the-wrap-limit.c', 32), ('src/eggs.c', 45)]
-    >>> entry.comment = 'A plural translation. This is a very very very long line please do not wrap, this is just for testing comment wrapping...'
-    >>> entry.tcomment = 'A plural translation. This is a very very very long line please do not wrap, this is just for testing comment wrapping...'
-    >>> entry.flags.append('c-format')
-    >>> entry.previous_msgctxt = '@somecontext'
-    >>> entry.previous_msgid = 'I had eggs but no spam !'
-    >>> entry.previous_msgid_plural = 'I had eggs and %d spam !'
-    >>> entry.msgctxt = '@somenewcontext'
-    >>> entry.msgid = 'I have spam but no egg !'
-    >>> entry.msgid_plural = 'I have spam and %d eggs !'
-    >>> entry.msgstr_plural[0] = "J'ai du jambon mais aucun oeuf !"
-    >>> entry.msgstr_plural[1] = "J'ai du jambon et %d oeufs !"
-    >>> print(entry)
-    #. A plural translation. This is a very very very long line please do not
-    #. wrap, this is just for testing comment wrapping...
-    # A plural translation. This is a very very very long line please do not wrap,
-    # this is just for testing comment wrapping...
-    #: src/some-very-long-filename-that-should-not-be-wrapped-even-if-it-is-larger-than-the-wrap-limit.c:32
-    #: src/eggs.c:45
-    #, c-format
-    #| msgctxt "@somecontext"
-    #| msgid "I had eggs but no spam !"
-    #| msgid_plural "I had eggs and %d spam !"
-    msgctxt "@somenewcontext"
-    msgid "I have spam but no egg !"
-    msgid_plural "I have spam and %d eggs !"
-    msgstr[0] "J'ai du jambon mais aucun oeuf !"
-    msgstr[1] "J'ai du jambon et %d oeufs !"
-    <BLANKLINE>
     """
 
     def __init__(self, *args, **kwargs):
-        """POEntry constructor."""
+        """
+        Constructor, accepts the following keyword arguments:
+
+        ``comment``
+            string, the entry comment.
+
+        ``tcomment``
+            string, the entry translator comment.
+
+        ``occurrences``
+            list, the entry occurrences.
+
+        ``flags``
+            list, the entry flags.
+
+        ``previous_msgctxt``
+            string, the entry previous context.
+
+        ``previous_msgid``
+            string, the entry previous msgid.
+
+        ``previous_msgid_plural``
+            string, the entry previous msgid_plural.
+        """
         _BaseEntry.__init__(self, *args, **kwargs)
         self.comment = kwargs.get('comment', '')
         self.tcomment = kwargs.get('tcomment', '')
@@ -998,33 +855,31 @@ class POEntry(_BaseEntry):
         self.previous_msgid = kwargs.get('previous_msgid', None)
         self.previous_msgid_plural = kwargs.get('previous_msgid_plural', None)
 
-    def __str__(self, wrapwidth=78):
+    def __unicode__(self, wrapwidth=78):
         """
-        Return the string representation of the entry.
+        Returns the unicode representation of the entry.
         """
         if self.obsolete:
-            return _BaseEntry.__str__(self)
+            return _BaseEntry.__unicode__(self, wrapwidth)
+
         ret = []
-        # comment first, if any (with text wrapping as xgettext does)
-        if self.comment != '':
-            for comment in self.comment.split('\n'):
-                if wrapwidth > 0 and len(comment) > wrapwidth-3:
-                    ret += textwrap.wrap(comment, wrapwidth,
-                                         initial_indent='#. ',
-                                         subsequent_indent='#. ',
-                                         break_long_words=False)
-                else:
-                    ret.append('#. %s' % comment)
-        # translator comment, if any (with text wrapping as xgettext does)
-        if self.tcomment != '':
-            for tcomment in self.tcomment.split('\n'):
-                if wrapwidth > 0 and len(tcomment) > wrapwidth-2:
-                    ret += textwrap.wrap(tcomment, wrapwidth,
-                                         initial_indent='# ',
-                                         subsequent_indent='# ',
-                                         break_long_words=False)
-                else:
-                    ret.append('# %s' % tcomment)
+        # comments first, if any (with text wrapping as xgettext does)
+        comments = [('comment', '#. '), ('tcomment', '# ')]
+        for c in comments:
+            val = getattr(self, c[0])
+            if val:
+                for comment in val.split('\n'):
+                    if wrapwidth > 0 and len(comment) + len(c[1]) > wrapwidth:
+                        ret += wrap(
+                            comment,
+                            wrapwidth,
+                            initial_indent=c[1],
+                            subsequent_indent=c[1],
+                            break_long_words=False
+                        )
+                    else:
+                        ret.append('%s%s' % (c[1], comment))
+
         # occurrences (with text wrapping as xgettext does)
         if self.occurrences:
             filelist = []
@@ -1034,79 +889,43 @@ class POEntry(_BaseEntry):
                 else:
                     filelist.append(fpath)
             filestr = ' '.join(filelist)
-            if wrapwidth > 0 and len(filestr)+3 > wrapwidth:
-                # XXX textwrap split words that contain hyphen, this is not 
+            if wrapwidth > 0 and len(filestr) + 3 > wrapwidth:
+                # textwrap split words that contain hyphen, this is not 
                 # what we want for filenames, so the dirty hack is to 
                 # temporally replace hyphens with a char that a file cannot 
                 # contain, like "*"
-                lines = textwrap.wrap(filestr.replace('-', '*'),
-                                      wrapwidth,
-                                      initial_indent='#: ',
-                                      subsequent_indent='#: ',
-                                      break_long_words=False)
-                # end of the replace hack
-                for line in lines:
-                    ret.append(line.replace('*', '-'))
+                ret += [l.replace('*', '-') for l in wrap(
+                    filestr.replace('-', '*'),
+                    wrapwidth,
+                    initial_indent='#: ',
+                    subsequent_indent='#: ',
+                    break_long_words=False
+                )]
             else:
-                ret.append('#: '+filestr)
-        # flags
+                ret.append('#: ' + filestr)
+
+        # flags (TODO: wrapping ?)
         if self.flags:
-            flags = []
-            for flag in self.flags:
-                flags.append(flag)
-            ret.append('#, %s' % ', '.join(flags))
+            ret.append('#, %s' % ', '.join(self.flags))
 
         # previous context and previous msgid/msgid_plural
-        if self.previous_msgctxt:
-            ret += self._str_field("previous_msgctxt", "#| ", "",
-                                   self.previous_msgctxt)
-        if self.previous_msgid:
-            ret += self._str_field("previous_msgid", "#| ", "", 
-                                   self.previous_msgid)
-        if self.previous_msgid_plural:
-            ret += self._str_field("previous_msgid_plural", "#| ", "", 
-                                   self.previous_msgid_plural)
+        fields = ['previous_msgctxt', 'previous_msgid', 'previous_msgid_plural']
+        for f in fields:
+            val = getattr(self, f)
+            if val:
+                ret += self._str_field(f, "#| ", "", val, wrapwidth)
 
-        ret.append(_BaseEntry.__str__(self))
-        return '\n'.join(ret)
+        ret.append(_BaseEntry.__unicode__(self, wrapwidth))
+        ret = '\n'.join(ret)
+
+        if type(ret) != types.UnicodeType:
+            return unicode(ret, self.encoding)
+        return ret
 
     def __cmp__(self, other):
-        '''
+        """
         Called by comparison operations if rich comparison is not defined.
-
-        **Tests**:
-        >>> a  = POEntry(msgid='a', occurrences=[('b.py', 1), ('b.py', 3)])
-        >>> b  = POEntry(msgid='b', occurrences=[('b.py', 1), ('b.py', 3)])
-        >>> c1 = POEntry(msgid='c1', occurrences=[('a.py', 1), ('b.py', 1)])
-        >>> c2 = POEntry(msgid='c2', occurrences=[('a.py', 1), ('a.py', 3)])
-        >>> po = POFile()
-        >>> po.append(a)
-        >>> po.append(b)
-        >>> po.append(c1)
-        >>> po.append(c2)
-        >>> po.sort()
-        >>> print(po)
-        # 
-        msgid ""
-        msgstr ""
-        <BLANKLINE>
-        #: a.py:1 a.py:3
-        msgid "c2"
-        msgstr ""
-        <BLANKLINE>
-        #: a.py:1 b.py:1
-        msgid "c1"
-        msgstr ""
-        <BLANKLINE>
-        #: b.py:1 b.py:3
-        msgid "a"
-        msgstr ""
-        <BLANKLINE>
-        #: b.py:1 b.py:3
-        msgid "b"
-        msgstr ""
-        <BLANKLINE>
-        '''
+        """
         def compare_occurrences(a, b):
             """
             Compare an entry occurrence with another one.
@@ -1153,7 +972,8 @@ class POEntry(_BaseEntry):
 
     def translated(self):
         """
-        Return True if the entry has been translated or False.
+        Returns ``True`` if the entry has been translated or ``False``
+        otherwise.
         """
         if self.obsolete or 'fuzzy' in self.flags:
             return False
@@ -1170,11 +990,19 @@ class POEntry(_BaseEntry):
         """
         Merge the current entry with the given pot entry.
         """
-        self.msgid        = other.msgid
-        self.occurrences  = other.occurrences
-        self.comment      = other.comment
-        self.flags        = other.flags
+        self.msgid = other.msgid
+        self.msgctxt = other.msgctxt
+        self.occurrences = other.occurrences
+        self.comment = other.comment
+        fuzzy = 'fuzzy' in self.flags
+        self.flags = other.flags[:]  # clone flags
+        if fuzzy:
+            self.flags.append('fuzzy')
         self.msgid_plural = other.msgid_plural
+        self.obsolete = other.obsolete
+        self.previous_msgctxt = other.previous_msgctxt
+        self.previous_msgid = other.previous_msgid
+        self.previous_msgid_plural = other.previous_msgid_plural
         if other.msgstr_plural:
             for pos in other.msgstr_plural:
                 try:
@@ -1189,23 +1017,8 @@ class POEntry(_BaseEntry):
 class MOEntry(_BaseEntry):
     """
     Represents a mo file entry.
-
-    **Examples**:
-
-    >>> entry = MOEntry()
-    >>> entry.msgid  = 'translate me !'
-    >>> entry.msgstr = 'traduisez moi !'
-    >>> print(entry)
-    msgid "translate me !"
-    msgstr "traduisez moi !"
-    <BLANKLINE>
     """
-
-    def __str__(self, wrapwidth=78):
-        """
-        Return the string representation of the entry.
-        """
-        return _BaseEntry.__str__(self, wrapwidth)
+    pass
 
 # }}}
 # class _POFileParser {{{
@@ -1216,28 +1029,37 @@ class _POFileParser(object):
     file format.
     """
 
-    def __init__(self, fpath, *args, **kwargs):
+    def __init__(self, pofile, *args, **kwargs):
         """
         Constructor.
 
-        **Arguments**:
-          - *fpath*: string, path to the po file
-          - *encoding*: string, the encoding to use, defaults to
-            "default_encoding" global variable (optional),
-          - *check_for_duplicates*: whether to check for duplicate entries
-            when adding entries to the file, default: False (optional).
+        Keyword arguments:
+
+        ``pofile``
+            string, path to the po file or its content
+
+        ``encoding``
+            string, the encoding to use, defaults to ``default_encoding``
+            global variable (optional).
+
+        ``check_for_duplicates``
+            whether to check for duplicate entries when adding entries to the
+            file (optional, default: ``False``).
         """
         enc = kwargs.get('encoding', default_encoding)
-        check_dup = kwargs.get('check_for_duplicates', False)
-        try:
-            self.fhandle = codecs.open(fpath, 'rU', enc)
-        except LookupError:
-            enc = default_encoding
-            self.fhandle = codecs.open(fpath, 'rU', enc)
+        if os.path.exists(pofile):
+            try:
+                self.fhandle = codecs.open(pofile, 'rU', enc)
+            except LookupError:
+                enc = default_encoding
+                self.fhandle = codecs.open(pofile, 'rU', enc)
+        else:
+            self.fhandle = pofile.splitlines()
+
         self.instance = POFile(
-            fpath=fpath,
+            pofile=pofile,
             encoding=enc,
-            check_for_duplicates=check_dup
+            check_for_duplicates=kwargs.get('check_for_duplicates', False)
         )
         self.transitions = {}
         self.current_entry = POEntry()
@@ -1289,59 +1111,103 @@ class _POFileParser(object):
         Run the state machine, parse the file line by line and call process()
         with the current matched symbol.
         """
-        i, lastlen = 1, 0
+        i = 0
+
+        keywords = {
+            'msgctxt': 'CT',
+            'msgid': 'MI',
+            'msgstr': 'MS',
+            'msgid_plural': 'MP',
+        }
+        prev_keywords = {
+            'msgid_plural': 'PP',
+            'msgid': 'PM',
+            'msgctxt': 'PC',
+        }
+
         for line in self.fhandle:
+            i += 1
             line = line.strip()
             if line == '':
-                i = i+1
                 continue
-            if line[:3] == '#~ ':
-                line = line[3:]
+
+            tokens = line.split(None, 2)
+            nb_tokens = len(tokens)
+
+            if tokens[0] == '#~' and nb_tokens > 1:
+                line = line[3:].strip()
+                tokens = tokens[1:]
+                nb_tokens -= 1
                 self.entry_obsolete = 1
             else:
                 self.entry_obsolete = 0
+
+            # Take care of keywords like
+            # msgid, msgid_plural, msgctxt & msgstr.
+            if tokens[0] in keywords and nb_tokens > 1:
+                line = line[len(tokens[0]):].lstrip()
+                self.current_token = line
+                self.process(keywords[tokens[0]], i)
+                continue
+
             self.current_token = line
-            if line[:2] == '#:':
+
+            if tokens[0] == '#:' and nb_tokens > 1:
                 # we are on a occurrences line
                 self.process('OC', i)
-            elif line[:9] == 'msgctxt "':
-                # we are on a msgctxt
-                self.process('CT', i)
-            elif line[:7] == 'msgid "':
-                # we are on a msgid
-                self.process('MI', i)
-            elif line[:8] == 'msgstr "':
-                # we are on a msgstr
-                self.process('MS', i)
-            elif line[:1] == '"' or line[:4] == '#| "':
-                # we are on a continuation line or some metadata
+
+            elif line[:1] == '"':
+                # we are on a continuation line
                 self.process('MC', i)
-            elif line[:14] == 'msgid_plural "':
-                # we are on a msgid plural
-                self.process('MP', i)
+
             elif line[:7] == 'msgstr[':
                 # we are on a msgstr plural
                 self.process('MX', i)
-            elif line[:3] == '#, ':
+
+            elif tokens[0] == '#,' and nb_tokens > 1:
                 # we are on a flags line
                 self.process('FL', i)
-            elif line[:2] == '# ' or line == '#':
-                if line == '#': line = line + ' '
+
+            elif tokens[0] == '#':
+                if line == '#': line += ' '
                 # we are on a translator comment line
                 self.process('TC', i)
-            elif line[:2] == '#.':
+
+            elif tokens[0] == '#.' and nb_tokens > 1:
                 # we are on a generated comment line
                 self.process('GC', i)
-            elif line[:15] == '#| msgid_plural':
-                # we are on a previous msgid_plural
-                self.process('PP', i)
-            elif line[:8] == '#| msgid':
-                self.process('PM', i)
-                # we are on a previous msgid
-            elif line[:10] == '#| msgctxt':
-                # we are on a previous msgctxt
-                self.process('PC', i)
-            i = i+1
+
+            elif tokens[0] == '#|':
+                if nb_tokens < 2:
+                    self.process('??', i)
+                    continue
+
+                # Remove the marker and any whitespace right after that.
+                line = line[2:].lstrip()
+                self.current_token = line
+
+                if tokens[1].startswith('"'):
+                    # Continuation of previous metadata.
+                    self.process('MC', i)
+                    continue
+
+                if nb_tokens == 2:
+                    # Invalid continuation line.
+                    self.process('??', i)
+
+                # we are on a "previous translation" comment line,
+                if tokens[1] not in prev_keywords:
+                    # Unknown keyword in previous translation comment.
+                    self.process('??', i)
+
+                # Remove the keyword and any whitespace
+                # between it and the starting quote.
+                line = line[len(tokens[1]):].lstrip()
+                self.current_token = line
+                self.process(prev_keywords[tokens[1]], i)
+
+            else:
+                self.process('??', i)
 
         if self.current_entry:
             # since entries are added when another entry is found, we must add
@@ -1363,17 +1229,24 @@ class _POFileParser(object):
                     if key is not None:
                         self.instance.metadata[key] += '\n'+ msg.strip()
         # close opened file
-        self.fhandle.close()
+        if isinstance(self.fhandle, file):
+            self.fhandle.close()
         return self.instance
 
     def add(self, symbol, states, next_state):
         """
         Add a transition to the state machine.
+
         Keywords arguments:
 
-        symbol     -- string, the matched token (two chars symbol)
-        states     -- list, a list of states (two chars symbols)
-        next_state -- the next state the fsm will have after the action
+        ``symbol``
+            string, the matched token (two chars symbol).
+
+        ``states``
+            list, a list of states (two chars symbols).
+
+        ``next_state``
+            the next state the fsm will have after the action.
         """
         for state in states:
             action = getattr(self, 'handle_%s' % next_state.lower())
@@ -1385,8 +1258,12 @@ class _POFileParser(object):
         symbol provided.
 
         Keywords arguments:
-        symbol  -- string, the matched token (two chars symbol)
-        linenum -- integer, the current line number of the parsed file
+
+        ``symbol``
+            string, the matched token (two chars symbol).
+
+        ``linenum``
+            integer, the current line number of the parsed file.
         """
         try:
             (action, state) = self.transitions[(symbol, self.current_state)]
@@ -1456,7 +1333,7 @@ class _POFileParser(object):
             self.instance.append(self.current_entry)
             self.current_entry = POEntry()
         self.current_entry.previous_msgid_plural = \
-            unescape(self.current_token[17:-1])
+            unescape(self.current_token[1:-1])
         return True
 
     def handle_pm(self):
@@ -1465,7 +1342,7 @@ class _POFileParser(object):
             self.instance.append(self.current_entry)
             self.current_entry = POEntry()
         self.current_entry.previous_msgid = \
-            unescape(self.current_token[10:-1])
+            unescape(self.current_token[1:-1])
         return True
 
     def handle_pc(self):
@@ -1474,7 +1351,7 @@ class _POFileParser(object):
             self.instance.append(self.current_entry)
             self.current_entry = POEntry()
         self.current_entry.previous_msgctxt = \
-            unescape(self.current_token[12:-1])
+            unescape(self.current_token[1:-1])
         return True
 
     def handle_ct(self):
@@ -1482,7 +1359,7 @@ class _POFileParser(object):
         if self.current_state in ['MC', 'MS', 'MX']:
             self.instance.append(self.current_entry)
             self.current_entry = POEntry()
-        self.current_entry.msgctxt = unescape(self.current_token[9:-1])
+        self.current_entry.msgctxt = unescape(self.current_token[1:-1])
         return True
 
     def handle_mi(self):
@@ -1491,17 +1368,17 @@ class _POFileParser(object):
             self.instance.append(self.current_entry)
             self.current_entry = POEntry()
         self.current_entry.obsolete = self.entry_obsolete
-        self.current_entry.msgid = unescape(self.current_token[7:-1])
+        self.current_entry.msgid = unescape(self.current_token[1:-1])
         return True
 
     def handle_mp(self):
         """Handle a msgid plural."""
-        self.current_entry.msgid_plural = unescape(self.current_token[14:-1])
+        self.current_entry.msgid_plural = unescape(self.current_token[1:-1])
         return True
 
     def handle_ms(self):
         """Handle a msgstr."""
-        self.current_entry.msgstr = unescape(self.current_token[8:-1])
+        self.current_entry.msgstr = unescape(self.current_token[1:-1])
         return True
 
     def handle_mx(self):
@@ -1541,10 +1418,6 @@ class _POFileParser(object):
             typ = 'previous_msgctxt'
             token = token[3:]
             self.current_entry.previous_msgctxt += token
-        if typ not in self.current_entry._multiline_str:
-            self.current_entry._multiline_str[typ] = token
-        else:
-            self.current_entry._multiline_str[typ] += "__POLIB__NL__" + token
         # don't change the current state
         return False
 
@@ -1555,43 +1428,41 @@ class _MOFileParser(object):
     """
     A class to parse binary mo files.
     """
-    BIG_ENDIAN    = 0xde120495
-    LITTLE_ENDIAN = 0x950412de
 
-    def __init__(self, fpath, *args, **kwargs):
+    def __init__(self, mofile, *args, **kwargs):
         """
         Constructor.
 
-        **Arguments**:
-          - *fpath*: string, path to the po file
-          - *encoding*: string, the encoding to use, defaults to
-            "default_encoding" global variable (optional),
-          - *check_for_duplicates*: whether to check for duplicate entries
-            when adding entries to the file, default: False (optional).
+        Keyword arguments:
+
+        ``mofile``
+            string, path to the mo file or its content
+
+        ``encoding``
+            string, the encoding to use, defaults to ``default_encoding``
+            global variable (optional).
+
+        ``check_for_duplicates``
+            whether to check for duplicate entries when adding entries to the
+            file (optional, default: ``False``).
         """
-        enc = kwargs.get('encoding', default_encoding)
-        check_dup = kwargs.get('check_for_duplicates', False)
-        self.fhandle = open(fpath, 'rb')
+        self.fhandle = open(mofile, 'rb')
         self.instance = MOFile(
-            fpath=fpath,
-            encoding=enc,
-            check_for_duplicates=check_dup
+            fpath=mofile,
+            encoding=kwargs.get('encoding', default_encoding),
+            check_for_duplicates=kwargs.get('check_for_duplicates', False)
         )
 
-    def parse_magicnumber(self):
-        """
-        Parse the magic number and raise an exception if not valid.
-        """
-
     def parse(self):
         """
         Build the instance with the file handle provided in the
         constructor.
         """
+        # parse magic number
         magic_number = self._readbinary('<I', 4)
-        if magic_number == self.LITTLE_ENDIAN:
+        if magic_number == MOFile.LITTLE_ENDIAN:
             ii = '<II'
-        elif magic_number == self.BIG_ENDIAN:
+        elif magic_number == MOFile.BIG_ENDIAN:
             ii = '>II'
         else:
             raise IOError('Invalid mo file, magic number is incorrect !')
@@ -1630,18 +1501,35 @@ class _MOFileParser(object):
             # test if we have a plural entry
             msgid_tokens = msgid.split('\0')
             if len(msgid_tokens) > 1:
-                entry = MOEntry(
+                entry = self._build_entry(
                     msgid=msgid_tokens[0],
                     msgid_plural=msgid_tokens[1],
-                    msgstr_plural=dict((k,v) for k,v in \
-                        enumerate(msgstr.split('\0')))
+                    msgstr_plural=dict((k,v) for k,v in enumerate(msgstr.split('\0')))
                 )
             else:
-                entry = MOEntry(msgid=msgid, msgstr=msgstr)
+                entry = self._build_entry(msgid=msgid, msgstr=msgstr)
             self.instance.append(entry)
         # close opened file
         self.fhandle.close()
         return self.instance
+    
+    def _build_entry(self, msgid, msgstr=None, msgid_plural=None,
+                     msgstr_plural=None):
+        msgctxt_msgid = msgid.split('\x04')
+        if len(msgctxt_msgid) > 1:
+            kwargs = {
+                'msgctxt': msgctxt_msgid[0],
+                'msgid'  : msgctxt_msgid[1],
+            }
+        else:
+            kwargs = {'msgid': msgid}
+        if msgstr:
+            kwargs['msgstr'] = msgstr
+        if msgid_plural:
+            kwargs['msgid_plural'] = msgid_plural
+        if msgstr_plural:
+            kwargs['msgstr_plural'] = msgstr_plural
+        return MOEntry(**kwargs)
 
     def _readbinary(self, fmt, numbytes):
         """
@@ -1655,26 +1543,97 @@ class _MOFileParser(object):
         return tup
 
 # }}}
-# __main__ {{{
+# class TextWrapper {{{
 
-if __name__ == '__main__':
+class TextWrapper(textwrap.TextWrapper):
     """
-    **Main function**::
-      - to **test** the module just run: *python polib.py [-v]*
-      - to **profile** the module: *python polib.py -p <some_pofile.po>*
+    Subclass of textwrap.TextWrapper that backport the
+    drop_whitespace option.
     """
-    import sys
-    if len(sys.argv) > 2 and sys.argv[1] == '-p':
-        def test(f):
-            if f.endswith('po'):
-                p = pofile(f)
+    def __init__(self, *args, **kwargs):
+        drop_whitespace = kwargs.pop('drop_whitespace', True) 
+        textwrap.TextWrapper.__init__(self, *args, **kwargs)
+        self.drop_whitespace = drop_whitespace
+
+    def _wrap_chunks(self, chunks):
+        """_wrap_chunks(chunks : [string]) -> [string]
+
+        Wrap a sequence of text chunks and return a list of lines of
+        length 'self.width' or less.  (If 'break_long_words' is false,
+        some lines may be longer than this.)  Chunks correspond roughly
+        to words and the whitespace between them: each chunk is
+        indivisible (modulo 'break_long_words'), but a line break can
+        come between any two chunks.  Chunks should not have internal
+        whitespace; ie. a chunk is either all whitespace or a "word".
+        Whitespace chunks will be removed from the beginning and end of
+        lines, but apart from that whitespace is preserved.
+        """
+        lines = []
+        if self.width <= 0:
+            raise ValueError("invalid width %r (must be > 0)" % self.width)
+
+        # Arrange in reverse order so items can be efficiently popped
+        # from a stack of chucks.
+        chunks.reverse()
+
+        while chunks:
+
+            # Start the list of chunks that will make up the current line.
+            # cur_len is just the length of all the chunks in cur_line.
+            cur_line = []
+            cur_len = 0
+
+            # Figure out which static string will prefix this line.
+            if lines:
+                indent = self.subsequent_indent
             else:
-                p = mofile(f)
-            s = unicode(p)
-        import profile
-        profile.run('test("'+sys.argv[2]+'")')
-    else:
-        import doctest
-        doctest.testmod()
+                indent = self.initial_indent
+
+            # Maximum width for this line.
+            width = self.width - len(indent)
+
+            # First chunk on line is whitespace -- drop it, unless this
+            # is the very beginning of the text (ie. no lines started yet).
+            if self.drop_whitespace and chunks[-1].strip() == '' and lines:
+                del chunks[-1]
+
+            while chunks:
+                l = len(chunks[-1])
+
+                # Can at least squeeze this chunk onto the current line.
+                if cur_len + l <= width:
+                    cur_line.append(chunks.pop())
+                    cur_len += l
+
+                # Nope, this line is full.
+                else:
+                    break
+
+            # The current line is full, and the next chunk is too big to
+            # fit on *any* line (not just this one).
+            if chunks and len(chunks[-1]) > width:
+                self._handle_long_word(chunks, cur_line, cur_len, width)
+
+            # If the last chunk on this line is all whitespace, drop it.
+            if self.drop_whitespace and cur_line and cur_line[-1].strip() == '':
+                del cur_line[-1]
+
+            # Convert current line back to a string and store it in list
+            # of all lines (return value).
+            if cur_line:
+                lines.append(indent + ''.join(cur_line))
+
+        return lines
 
 # }}}
+# function wrap() {{{
+
+def wrap(text, width=70, **kwargs):
+    """
+    Wrap a single paragraph of text, returning a list of wrapped lines.
+    """
+    if sys.version_info < (2, 6):
+        return TextWrapper(width=width, **kwargs).wrap(text)
+    return textwrap.wrap(text, width=width, **kwargs)
+
+#}}}