from fontTools.misc.textTools import Tag
from fontTools.ttLib import getClassTag


class DefaultTable(object):

    dependencies = []

    def __init__(self, tag=None):
        if tag is None:
            tag = getClassTag(self.__class__)
        self.tableTag = Tag(tag)

    def decompile(self, data, ttFont):
        self.data = data

    def compile(self, ttFont):
        return self.data

    def toXML(self, writer, ttFont, **kwargs):
        if hasattr(self, "ERROR"):
            writer.comment("An error occurred during the decompilation of this table")
            writer.newline()
            writer.comment(self.ERROR)
            writer.newline()
        writer.begintag("hexdata")
        writer.newline()
        writer.dumphex(self.compile(ttFont))
        writer.endtag("hexdata")
        writer.newline()

    def fromXML(self, name, attrs, content, ttFont):
        from fontTools.misc.textTools import readHex
        from fontTools import ttLib

        if name != "hexdata":
            raise ttLib.TTLibError("can't handle '%s' element" % name)
        self.decompile(readHex(content), ttFont)

    def __repr__(self):
        return "<'%s' table at %x>" % (self.tableTag, id(self))

    def __eq__(self, other):
        if type(self) != type(other):
            return NotImplemented
        return self.__dict__ == other.__dict__

    def __ne__(self, other):
        result = self.__eq__(other)
        return result if result is NotImplemented else not result
