from i18n import _

class sortdict(dict):

    'a simple append-only sorted dictionary'

    def __init__(self, data=None):

        self._list = []

        if data:

            if hasattr(data, '_list'):

                self._list = list(data._list)

            self.update(data)

    def copy(self):

        return sortdict(self)

    def __setitem__(self, key, val):

        if key in self:

            self._list.remove(key)

        self._list.append(key)

        dict.__setitem__(self, key, val)

    def __iter__(self):

        return self._list.__iter__()

    def update(self, src):

        for k in src:

            self[k] = src[k]

    def items(self):

        return [(k,self[k]) for k in self._list]

class config:

    def __init__(self, data=None):

        self._data = {}

        if data:

            for k in data._data:

                self._data[k] = data[k].copy()

    def copy(self):

        return config(self)

    def __contains__(self, section):

        return section in self._data

    def update(self, src, sections=None):

        if not sections:

            sections = src.sections()

        for s in sections:

            if s not in src:

                continue

            if s not in self:

                self._data[s] = sortdict()

            for k in src._data[s]:

                self._data[s][k] = src._data[s][k]

    def get(self, section, item, default=None):

        return self._data.get(section, {}).get(item, (default, ""))[0]

    def getsource(self, section, item):

        return self._data.get(section, {}).get(item, (None, ""))[1]

    def sections(self):

        return sorted(self._data.keys())

    def items(self, section):

        return [(k, v[0]) for k,v in self._data.get(section, {}).items()]

    def set(self, section, item, value, source=""):

        if section not in self:

            self._data[section] = sortdict()

        self._data[section][item] = (value, source)

    def read(self, path, fp=None):

        sectionre = re.compile(r'\[([^\[]+)\]')

        itemre = re.compile(r'([^=\s]+)\s*=\s*(.*)')

        contre = re.compile(r'\s+(\S.*)')

        emptyre = re.compile(r'(;|#|\s*$)')

        section = ""

        item = None

        line = 0

        cont = 0

        if not fp:

            fp = open(path)

        for l in fp:

            line += 1

            if cont:

                m = contre.match(l)

                if m:

                    v = self.get(section, item) + "\n" + m.group(1)

                    self.set(section, item, v, "%s:%d" % (path, line))

                    continue

                item = None

            if emptyre.match(l):

                continue

            m = sectionre.match(l)

            if m:

                section = m.group(1)

                if section not in self:

                    self._data[section] = sortdict()

                continue

            m = itemre.match(l)

            if m:

                item = m.group(1)

                self.set(section, item, m.group(2), "%s:%d" % (path, line))

                cont = 1

                continue

            raise error.ConfigError(_('config error at %s:%d: \'%s\'')

                                    % (path, line, l.rstrip()))