Subversion Repositories LCARS

"""

Created on 2014-10-20

@author: Thomas 'PointedEars' Lahn <mail@PointedEars.de>

"""

from os import chdir, stat

from sys import stderr

from os.path import dirname, realpath, basename

from pickle import dump, load

from re import match, DOTALL, search, sub, split, compile

debug_level = 2

def dmsg(*args, **kwargs):

    if not hasattr(kwargs, 'min_level') or kwargs['min_level'] is None:

        kwargs['min_level'] = 1

    if not hasattr(kwargs, 'file'):

        kwargs['file'] = stderr

    if debug_level >= kwargs['min_level']:

        del kwargs['min_level']

        print(*args, **kwargs)

def sort_dict_alnum_english_key(phrase):

    return sub(r'\{(.+)\}', r'\1', phrase[0]).lower()

class Dictionary(dict):

    """

    A Dictionary (not to be confused with its ancestor, dict)

    represents a word dictionary stored in a file.

    """

    _language_key = 'en'

    _keys = "ipa|en|lit|pos|com|tag|ex"

    _expressions = {}

    def load (self, dictionary_file, language_key='en'):

        """

        Loads a word dictionary from a file.

        :param dictionary_file:

        :type dictionary_file:

        :param language_key:

        :type language_key:

        """

        self._language_key = language_key

        dmsg('Loading dictionary '.format(dictionary_file), end='', min_level=1)

        chdir(dirname(realpath(__file__)))

        pickle_file = basename(dictionary_file) + '.pickle'

        try:

            pickle_mtime = stat(pickle_file).st_mtime

        except FileNotFoundError:

            pickle_mtime = None

        if pickle_mtime is None or stat(dictionary_file).st_mtime > pickle_mtime:

            dmsg('from {0} ...'.format(dictionary_file), end='', min_level=1)

            phrase = None

            key = None

            value = None

            with open(dictionary_file) as f:

                indent = None

                for line in f:

                    m = match(r'^\s*{0}:\s*(?P<phrase>.+)'.format(self._language_key), line)

                    if m is not None:

                        phrase = m.group("phrase")

                        self[phrase] = {}

                        indent = None

                    else:

                        m = match(r'(?P<indent>\s*)(?P<key>{0}):\s*(?P<value>.+)'.format(self._keys), line)

                        if m is not None:

                            # join previous value if necessary

                            if type(value) == list:

                                self[phrase][key] = ' '.join(value)

                            indent = m.group("indent")

                            key = m.group("key")

                            value = m.group("value")

                            # assign a string for memory efficiency

                            self[phrase][key] = value

                        elif indent is not None:

                            m = match(r'(?P<indent>\s+)(?P<continuation>\S.*)', line)

                            if m is not None:

                                if len(m.group("indent")) == len(indent) + 2:

                                    continuation = m.group("continuation")

                                    if type(value) == str:

                                        # when a continuation is first found, convert to a list

                                        # because there could be more continuations

                                        value = self[phrase][key] = [value, continuation]

                                    else:

                                        value.append(continuation)

            # join last value if necessary

            if type(value) == list:

                self[phrase][key] = ' '.join(value)

            dmsg('\nSaving pickle {0} ...'.format(pickle_file), end='', min_level=1)

            # TODO: Pickle should only contain strings to be small

            with open(pickle_file, mode='wb') as f: dump(self, f)

            dmsg(' done.', min_level=1)

        else:

            dmsg('from {0} ...'.format(pickle_file), end='', min_level=1)

            with open(pickle_file, mode='rb') as f: pickle = load(f)

            for key, value in pickle.items():

                self[key] = value

        dmsg(' done ({0} entries).'.format(len(self)), min_level=1)

    def clean (self):

        """

        Cleans dictionary entries

        """

        re_parens = compile(r'\(.+\)', DOTALL)

        re_parens_no_alt = compile(r'\(([^\|]+)\)', DOTALL)

        re_braces = compile(

            r'^\s*\{(?P<phrase>.+)\}(?:\s*\((?P<variant>.+?)\))?\s*$',

            DOTALL)

        re_semicolon = compile(r'\s*;\s*')

        for orig_phrase, data in list(self.items()):

            # if there are optional or alternating parts

            if search(re_parens, orig_phrase):

                if orig_phrase.find('|') > -1:

                    # TODO alternation

                    pass

                else:

                    # TODO optional parts

                    pass

            if orig_phrase.find(';') > -1:

                synonyms = map(

                    lambda x: sub(re_braces, r'\1', x),

                    split(re_semicolon, orig_phrase))

                for synonym in synonyms:

                    self[synonym] = data

                del self[orig_phrase]

            else:

                m = match(re_braces, orig_phrase)

                if m is not None:

                    phrase = m.group('phrase')

                    if callable(getattr(self, 'clean_entry', None)):

                        phrase = self.clean_entry(phrase)

                    m_parens = search(re_parens, phrase)

                    if m_parens is not None:

                        # alternation and optional parts

                        expr = sub(re_parens_no_alt, r'(?:\1)?', phrase)

                        expr = sub('~', '(?=.)', expr)

                        self._expressions[expr] = data

                    else:

                        # remove braces

                        self[phrase] = data

                    del self[orig_phrase]

    def translate (self, phrase):

        """

        Translate a phrase according to this dictionary.

        For language-specific processing, this method should be

        called/overridden by inheriting classes.

        :param phrase:

        :type phrase: str

        """

        translation = self.get(phrase.lower(), None)

        if translation is not None:

            translation[self._language_key] = phrase

            return translation

        return None

    def translate_expression (self, phrase):

        """

        Translate a phrase according entries in this dictionary

        based on regular expressions.

        :param phrase:

        :type phrase:

        """

        for expression, data in sorted(self._expressions.items(), key=lambda item:-len(item[1])):

            expression_match = match(expression, phrase)

            if expression_match is not None:

                data[self._language_key] = expression_match.group(0)

                return data

        return None