#!/usr/bin/env python

# Copyright (C) 2002-2004  TechGame Networks, LLC.
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the BSD style License as found in the
# LICENSE file included with this distribution.
#
# Modified by Dirk Holtwick <holtwick@web.de>, 2007-2008

from . import css  # python 3


#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#~ Definitions
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

class CSSDOMElementInterface(css.CSSElementInterfaceAbstract):
    """An implementation of css.CSSElementInterfaceAbstract for xml.dom Element Nodes"""

    #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    #~ Constants / Variables / Etc.
    #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    style = None

    _pseudoStateHandlerLookup = {
        'first-child':
            lambda self: not bool(self.getPreviousSibling()),
        'not-first-child':
            lambda self: bool(self.getPreviousSibling()),

        'last-child':
            lambda self: not bool(self.getNextSibling()),
        'not-last-child':
            lambda self: bool(self.getNextSibling()),

        'middle-child':
            lambda self: not bool(self.getPreviousSibling()) and not bool(self.getNextSibling()),
        'not-middle-child':
            lambda self: bool(self.getPreviousSibling()) or bool(self.getNextSibling()),

        # XXX 'first-line':

    }

    #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    #~ Definitions
    #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    def __init__(self, domElement, cssParser=None):
        self.domElement = domElement
        # print self.domElement.attributes
        if cssParser is not None:
            self.onCSSParserVisit(cssParser)


    def onCSSParserVisit(self, cssParser):
        styleSrc = self.getStyleAttr()
        if styleSrc:
            style = cssParser.parseInline(styleSrc)
            self.setInlineStyle(style)


    #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    def matchesNode(self, namespace_tagName):
        namespace,tagName = namespace_tagName
        if tagName not in ('*', self.domElement.tagName):
            return False
        if namespace in (None, '', '*'):
            # matches any namespace
            return True
        else: # full compare
            return namespace == self.domElement.namespaceURI


    def getAttr(self, name, default=NotImplemented):
        attrValue = self.domElement.attributes.get(name)
        if attrValue is not None:
            return attrValue.value
        else:
            return default


    def getIdAttr(self):
        return self.getAttr('id', '')


    def getClassAttr(self):
        return self.getAttr('class', '')


    def getStyleAttr(self):
        return self.getAttr('style', None)


    def inPseudoState(self, name, params=()):
        handler = self._pseudoStateHandlerLookup.get(name, lambda self: False)
        return handler(self)


    def iterXMLParents(self, includeSelf=False):
        klass = self.__class__
        current = self.domElement
        if not includeSelf:
            current = current.parentNode
        while (current is not None) and (current.nodeType == current.ELEMENT_NODE):
            yield klass(current)
            current = current.parentNode


    def getPreviousSibling(self):
        sibling = self.domElement.previousSibling
        while sibling:
            if sibling.nodeType == sibling.ELEMENT_NODE:
                return sibling
            else:
                sibling = sibling.previousSibling
        return None


    def getNextSibling(self):
        sibling = self.domElement.nextSibling
        while sibling:
            if sibling.nodeType == sibling.ELEMENT_NODE:
                return sibling
            else:
                sibling = sibling.nextSibling
        return None


    def getInlineStyle(self):
        return self.style


    def setInlineStyle(self, style):
        self.style = style