"""

gadict dictionary format parser.

"""

import sys

import regex

class Prelude:

    """Dictionary metainfo structure."""

    name = None

    about = ""

    urls = []

    authors = []

    licences = []

class ParseException(BaseException):

    def __init__(self, msg, lineno=None, line=None):

        BaseException.__init__(self)

        self.msg = msg

        self.lineno = lineno

        self.line = line

    def __repr__(self):

        if self.lineno is None:

            return self.msg

        elif self.line is None:

            return ":{:d}:{:s}".format(self.lineno, self.msg.encode('utf-8'))

        else:

            return ":{:d}: {:s}\nLINE: {:s}".format(self.lineno, self.msg.encode('utf-8'), self.line.encode('utf-8'))

class Headword:

    def __init__(self, headword, pron = None, attrs = None):

        self.headword = headword

        self.pron = pron

        self.attrs = attrs

    def __str__(self):

        return self.headword

    def __repr__(self):

        return "<Headword {}>".format(self.headword)

class Sense:

    def __init__(self, pos, tr_list = None, ex_list = None, syn_list = None, ant_list = None, topic_list = None):

        if not pos:

            raise ParseException("Part of speech expected...\n")

        self.pos = pos

        self.tr_list = tr_list

        if not tr_list:

            self.tr_list = []

        self.ex_list = ex_list

        self.syn_list = syn_list

        self.ant_list = ant_list

        self.topic_list = topic_list

    def add_tr(self, tr):

        self.tr_list.append(tr)

    def add_ex(self, ex):

        if not self.ex_list:

            self.ex_list = [ex]

        else:

            self.ex_list.append(ex)

    def add_syn(self, syn):

        if not self.syn_list:

            self.syn_list = [syn]

        else:

            self.syn_list.append(syn)

    def add_ant(self, ant):

        if not self.ant_list:

            self.ant_list = [ant]

        else:

            self.ant_list.append(ant)

    def add_topic(self, topic):

        if not self.topic_list:

            self.topic_list = [topic]

        else:

            self.topic_list.append(topic)

    def __str__(self):

        if tr_list:

            (lang, text) = self.tr_list[0]

            return "{}: {}".format(lang, text)

        return "<empy sence>"

    def __repr__(self):

        return "<Sence {}>".format(str(self))

class Parser:

    """gadict dictionary format parser."""

    COMMENT_RE = regex.compile(r"^# ")

    SEPARATOR_RE = regex.compile(u"^__$")

    HEADWORD_RE = regex.compile( u"^(\\p{L}.*)$" )

    HEADWORD_VAR_RE = regex.compile(u"^ +(s|pl|v[123]|male|female|comp|super|abbr|Am|Br|Au)$")

    HEADWORD_PRON_RE = regex.compile(u"^ +\\[([\p{L}' ]+)\\]$")

    TRANSL_POS_RE = regex.compile(u"^n|det|pron|adj|v|adv|prep|conj|num|int|phr|phr\\.v|contr|abbr|prefix$")

    TRANSL_RE = regex.compile(u"^(ru|uk|la|en): ([\\p{L}(].*)$")

    TRANSL_EX_RE = regex.compile(u"^(ru|uk|la|en)> ([-\\p{L}].*)$")

    TOPIC_RE = regex.compile(u"^topic: (\\p{L}.*)$")

    SYN_RE = regex.compile(u"^syn: (\\p{L}.*)$")

    ANT_RE = regex.compile(u"^ant: (\\p{L}.*)$")

    CONT_RE = regex.compile(u"^ +(.*)")

    TRAILING_SPACES_RE = regex.compile(u"\\p{Z}+$")

    PRELUDE_NAME_RE = regex.compile(u"^name: (.*)")

    PRELUDE_URL_RE = regex.compile(u"^url: (.*)")

    PRELUDE_AUTHOR_RE = regex.compile(u"^by: (.*)")

    PRELUDE_LICENSE_RE = regex.compile(u"^term: (.*)")

    PRELUDE_ABOUT_RE = regex.compile(u"^about: ?(.*)")

    def __init__(self):

        pass

    def readline(self):

        while True:

            self.line = self.stream.readline()

            self.eof = len(self.line) == 0

            if not self.eof:

                self.lineno += 1

            if self.TRAILING_SPACES_RE.search(self.line):

                raise ParseException("Traling spaces detected...\n")

            if self.COMMENT_RE.search(self.line):

                continue

            break

    def parse(self, stream):

        self.lineno = 0

        self.stream = stream

        self.dom = []

        try:

            self.parse_prelude()

            while not self.eof:

                self.parse_article()

        except ParseException as ex:

            if sys.version_info.major == 2:

                import traceback

                traceback.print_exc()

            raise ParseException(ex.msg, self.lineno, self.line)

        return self.dom

    def parse_prelude_continuation(self):

        string = ""

        while True:

            self.readline()

            if self.eof:

                return string

            m = self.CONT_RE.match(self.line)

            if m is not None:

                string += "\n" + m.group(1)

            elif len(self.line) == 1:

                string += "\n"

            else:

                return string

    def parse_prelude(self):

        """Read dictionary prelude until first "__" delimiter."""

        pre = Prelude()

        while True:

            self.readline()

            if self.eof:

                raise ParseException("There are no articles...")

            m = self.PRELUDE_ABOUT_RE.match(self.line)

            if m:

                pre.about += m.group(1) + self.parse_prelude_continuation()

                if self.eof:

                    raise ParseException("There are no articles...")

            if self.SEPARATOR_RE.match(self.line):

                break

            m = self.PRELUDE_NAME_RE.match(self.line)

            if m:

                pre.name = m.group(1)

                continue

            m = self.PRELUDE_URL_RE.match(self.line)

            if m:

                pre.urls.append(m.group(1))

                continue

            m = self.PRELUDE_AUTHOR_RE.match(self.line)

            if m:

                pre.authors.append(m.group(1))

                continue

            m = self.PRELUDE_LICENSE_RE.match(self.line)

            if m:

                pre.licences.append(m.group(1))

                continue

        self.dom.append(pre)

    def parse_article(self):

        """Try to match article until next "__" delimiter. Assume that `self.line` point to "__" delimiter."""

        self.words = None

        self.tran = None

        self.parse_empty_line()

        self.parse_headlines()

        self.parse_translation()

        self.dom.append((self.words, self.tran))

    def parse_empty_line(self):

        self.readline()

        if self.eof or len(self.line) != 1:

            raise ParseException(""""__" delimiter should followed by empty line...""")

    def parse_headlines(self):

        """Try to match word variations with attributed. Assume that `self.line` on preceding empty line."""

        self.words = []

        self.readline()

        if self.eof:

            raise ParseException("""There are no definition after "__" delimiter...""")

        m = self.HEADWORD_RE.match(self.line)

        if m is None:

            raise ParseException("""There are no headword after "__" delimiter...""")

        word = m.group(1)

        pron = None

        attrs = set()

        while True:

            self.readline()

            if self.eof or len(self.line) == 1:

                break

            m = self.HEADWORD_RE.match(self.line)

            if m is not None:

                if word is None:

                    raise ParseException("""Didn't match previous headword...""")

                self.words.append(Headword(word, pron, attrs))

                word = m.group(1)

                pron = None

                attrs = set()

                continue

            m = self.HEADWORD_PRON_RE.match(self.line)

            if m is not None:

                if pron is not None:

                    raise ParseException("""Pronunciation is redefined...""")

                pron = m.group(1)

                continue

            m = self.HEADWORD_VAR_RE.match(self.line)

            if m is not None:

                attrs.add(m.group(1))

                continue

            raise ParseException("""Line is not a headword or translation or headword attribute...""")

        self.words.append(Headword(word, pron, attrs))

    def parse_translation_continuation(self):

        string = ""

        while True:

            self.readline()

            if self.eof:

                return string

            m = self.CONT_RE.match(self.line)

            if m is not None:

                string += "\n" + m.group(1)

            else:

                return string

    def parse_translation(self):

        senses = []

        sense = None

        read = True

        while True:

            if read:

                self.readline()

            read = True

            if self.eof:

                break

            m = self.SEPARATOR_RE.match(self.line)

            if m is not None:

                if sense:

                    senses.append(sense)

                break

            if len(self.line) == 1:

                if sense:

                    senses.append(sense)

                sense = None

                continue

            m = self.TRANSL_POS_RE.match(self.line)

            if m is not None:

                if sense is not None:

                    raise ParseException("""Each translation should have only one part of speech marker...""")

                pos = m.group(0)

                sense = Sense(pos)

                continue

            if not sense:

                raise ParseException("""Missing part of speech marker...""")

            m = self.TOPIC_RE.match(self.line)

            if m is not None:

                topics = m.group(1).split(";")

                for topic in topics:

                    topic = topic.strip()

                    if len(topic) == 0:

                        raise ParseException("""Empty topic...""")

                    sense.add_topic(topic)

                continue

            m = self.SYN_RE.match(self.line)

            if m is not None:

                syns = m.group(1).split(";")

                for syn in syns:

                    syn = syn.strip()

                    if len(syn) == 0:

                        raise ParseException("""Empty synonym...""")

                    sense.add_syn(syn)

                continue

            m = self.ANT_RE.match(self.line)

            if m is not None:

                ants = m.group(1).split(";")

                for ant in ants:

                    ant = ant.strip()

                    if len(ant) == 0:

                        raise ParseException("""Empty antonym...""")

                    sense.add_ant(ant)

                continue

            m = self.TRANSL_RE.match(self.line)

            if m is not None:

                sense.add_tr((m.group(1), m.group(2) + self.parse_translation_continuation()))

                read = False

                continue

            m = self.TRANSL_EX_RE.match(self.line)

            if m is not None:

                sense.add_ex((m.group(1), m.group(2) + self.parse_translation_continuation()))

                read = False

                continue

            raise ParseException("""Uknown syntax...""")

        self.tran = senses