# -*- coding: UTF-8 -*-
#
#       machines.py
#
#       Copyright 2009-2019 Giuseppe Penone <giuspen@gmail.com>
#
#       This program is free software; you can redistribute it and/or modify
#       it under the terms of the GNU General Public License as published by
#       the Free Software Foundation; either version 3 of the License, or
#       (at your option) any later version.
#
#       This program is distributed in the hope that it will be useful,
#       but WITHOUT ANY WARRANTY; without even the implied warranty of
#       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#       GNU General Public License for more details.
#
#       You should have received a copy of the GNU General Public License
#       along with this program; if not, write to the Free Software
#       Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
#       MA 02110-1301, USA.

import gtk
import xml.dom.minidom
import re
import base64
import copy
import StringIO
import cons
import config
import support
import exports


def get_blob_buffer_from_pixbuf(pixbuf):
    """Pixbuf To BLOB Buffer"""
    io = StringIO.StringIO()
    pixbuf.save_to_callback(io.write, "png")
    blob_buffer = buffer(io.getvalue())
    return blob_buffer

def get_pixbuf_from_png_blob_buffer(blob_buffer):
    """Raw Buffer To Pixbuf"""
    pixbuf_loader = gtk.gdk.pixbuf_loader_new_with_mime_type("image/png")
    try:
        pixbuf_loader.write(blob_buffer)
        pixbuf_loader.close()
        pixbuf = pixbuf_loader.get_pixbuf()
    except: pixbuf = None
    return pixbuf

def get_pixbuf_from_encoded_buffer(encoded_buffer):
    """Encoded Buffer To Pixbuf"""
    blob_buffer = base64.b64decode(encoded_buffer)
    return get_pixbuf_from_png_blob_buffer(blob_buffer)

def get_encoded_buffer_from_pixbuf(pixbuf):
    """Pixbuf To Encoded Buffer"""
    io = StringIO.StringIO()
    pixbuf.save_to_callback(io.write, "png")
    encoded_buffer = base64.b64encode(io.getvalue())
    return encoded_buffer

# legacy
def get_pixbuf_from_png_encoded_string(png_encoded_string):
    """PNG Encoded String To Pixbuf"""
    fd = open(cons.IMG_PATH, "wb")
    fd.write(base64.b64decode(png_encoded_string))
    fd.close()
    pixbuf = gtk.gdk.pixbuf_new_from_file(cons.IMG_PATH)
    return pixbuf


class XMLHandler:
    """The Handler of the procedures involving XML"""

    def __init__(self, dad):
        """Machine boot"""
        self.dad = dad

    def dom_to_buffer(self, textbuffer, tagged_text):
        """Given a TextBuffer and a string of rich text, fills the buffer properly"""
        textbuffer.delete(*textbuffer.get_bounds())
        dom = xml.dom.minidom.parseString(tagged_text)
        dom_iter = dom.firstChild
        if dom_iter.nodeName != "node": return False
        child_dom_iter = dom_iter.firstChild
        # loop for text
        while child_dom_iter!= None:
            if child_dom_iter.nodeName == "rich_text": self.rich_text_deserialize(textbuffer, child_dom_iter)
            child_dom_iter = child_dom_iter.nextSibling
        textbuffer.set_modified(False)
        return True

    def reset_nodes_names(self):
        """Reset Nodes Names"""
        self.dad.nodes_names_dict = {}
        bookmarks_menu = self.dad.ui.get_widget("/MenuBar/BookmarksMenu").get_submenu()
        for menu_item in self.dad.bookmarks_menu_items:
            bookmarks_menu.remove(menu_item)
        self.dad.bookmarks_menu_items = []

    def dom_to_treestore(self, ctd, discard_ids, tree_father=None):
        """Parse an XML Cherry Tree Document file and build the Tree"""
        dom = xml.dom.minidom.parseString(ctd)
        cherrytree = dom.firstChild
        if cherrytree.nodeName != cons.APP_NAME: return False
        else:
            dom_iter = cherrytree.firstChild
            node_sequence = self.dad.nodes_sequences_get_max_siblings(tree_father)
            next_id_box = [self.dad.node_id_get()]
            while dom_iter!= None:
                if dom_iter.nodeName == "node":
                    node_sequence += 1
                    self.append_tree_node(dom_iter, tree_father, discard_ids, node_sequence, next_id_box)
                elif dom_iter.nodeName == "bookmarks":
                    if dom_iter.attributes['list'].value:
                        self.dad.bookmarks = dom_iter.attributes['list'].value.split(",")
                dom_iter = dom_iter.nextSibling
            return True

    def append_tree_node(self, dom_iter, tree_father, discard_ids, node_sequence, next_id_box):
        """Given the dom_iter node, adds it to the tree"""
        if dom_iter.hasAttribute('unique_id'):
            original_id = long(dom_iter.attributes['unique_id'].value)
            if discard_ids is None:
                unique_id = original_id
            else:
                unique_id = self.dad.node_id_get(original_id, discard_ids)
        else:
            unique_id = next_id_box[0]
            next_id_box[0] = self.dad.node_id_get_simplified(next_id_box[0] + 1)
        node_tags = dom_iter.attributes['tags'].value if dom_iter.hasAttribute('tags') else ""
        if node_tags: self.dad.tags_add_from_node(node_tags)
        readonly = (dom_iter.attributes['readonly'].value == "True") if dom_iter.hasAttribute('readonly') else False
        custom_icon_id = int(dom_iter.attributes['custom_icon_id'].value) if dom_iter.hasAttribute('custom_icon_id') else 0
        is_bold = (dom_iter.attributes['is_bold'].value == "True") if dom_iter.hasAttribute('is_bold') else False
        foreground = dom_iter.attributes['foreground'].value if dom_iter.hasAttribute('foreground') else ""
        if not foreground: foreground = None
        syntax_highlighting = dom_iter.attributes['prog_lang'].value
        if syntax_highlighting not in [cons.RICH_TEXT_ID, cons.PLAIN_TEXT_ID]\
        and syntax_highlighting not in self.dad.available_languages:
            syntax_highlighting = syntax_highlighting.lower().replace("C++", "cpp")
            if syntax_highlighting not in self.dad.available_languages:
                syntax_highlighting = cons.RICH_TEXT_ID
        node_depth = 0 if not tree_father else self.dad.treestore.iter_depth(tree_father)+1
        cherry = self.dad.get_node_icon(node_depth, syntax_highlighting, custom_icon_id)
        ts_creation = float(dom_iter.attributes['ts_creation'].value) if dom_iter.hasAttribute('ts_creation') else 0
        ts_lastsave = float(dom_iter.attributes['ts_lastsave'].value) if dom_iter.hasAttribute('ts_lastsave') else 0
        curr_buffer = self.dad.buffer_create(syntax_highlighting)
        if syntax_highlighting != cons.RICH_TEXT_ID: curr_buffer.begin_not_undoable_action()
        # loop into rich text, write into the buffer
        child_dom_iter = dom_iter.firstChild
        while child_dom_iter != None:
            if child_dom_iter.nodeName == "rich_text":
                self.rich_text_deserialize(curr_buffer, child_dom_iter, discard_ids)
            elif child_dom_iter.nodeName == "encoded_png": self.image_deserialize(curr_buffer, child_dom_iter, 2)
            elif child_dom_iter.nodeName == "table": self.table_deserialize(curr_buffer, child_dom_iter)
            elif child_dom_iter.nodeName == "codebox": self.codebox_deserialize(curr_buffer, child_dom_iter)
            elif child_dom_iter.nodeName == "encoded_image": self.image_deserialize(curr_buffer, child_dom_iter, 1)
            elif child_dom_iter.nodeName == "node": break
            child_dom_iter = child_dom_iter.nextSibling
        if syntax_highlighting != cons.RICH_TEXT_ID: curr_buffer.end_not_undoable_action()
        curr_buffer.set_modified(False)
        #print unique_id
        # insert the node containing the buffer into the tree
        tree_iter = self.dad.treestore.append(tree_father, [cherry,
                                                            dom_iter.attributes['name'].value,
                                                            curr_buffer,
                                                            unique_id,
                                                            syntax_highlighting,
                                                            node_sequence,
                                                            node_tags,
                                                            readonly,
                                                            None,
                                                            custom_icon_id,
                                                            support.get_pango_weight(is_bold),
                                                            foreground,
                                                            ts_creation,
                                                            ts_lastsave])
        self.dad.update_node_aux_icon(tree_iter)
        self.dad.nodes_names_dict[unique_id] = self.dad.treestore[tree_iter][1]
        if discard_ids is not None:
            # we are importing nodes
            self.dad.ctdb_handler.pending_new_db_node(unique_id)
        # loop for child nodes
        child_sequence = 0
        while child_dom_iter!= None:
            if child_dom_iter.nodeName == "node":
                child_sequence += 1
                self.append_tree_node(child_dom_iter, tree_iter, discard_ids, child_sequence, next_id_box)
            elif child_dom_iter.nodeName == 'rich_text':
                support.dialog_error("Rich text instead of child node??!!", self.dad.window)
                break
            child_dom_iter = child_dom_iter.nextSibling

    def codebox_deserialize(self, curr_buffer, dom_node):
        """From the XML codebox text to the SourceBuffer"""
        char_offset = int(dom_node.attributes["char_offset"].value)
        justification = dom_node.attributes[cons.TAG_JUSTIFICATION].value if dom_node.hasAttribute(cons.TAG_JUSTIFICATION) else cons.TAG_PROP_LEFT
        codebox_dict = {
           'frame_width': int(dom_node.attributes['frame_width'].value),
           'frame_height': int(dom_node.attributes['frame_height'].value),
           'width_in_pixels': dom_node.hasAttribute("width_in_pixels") and dom_node.attributes['width_in_pixels'].value == "True",
           'syntax_highlighting': dom_node.attributes['syntax_highlighting'].value,
           'highlight_brackets': dom_node.hasAttribute("highlight_brackets") and dom_node.attributes['highlight_brackets'].value == "True",
           'show_line_numbers': dom_node.hasAttribute("show_line_numbers") and dom_node.attributes['show_line_numbers'].value == "True",
           'fill_text': dom_node.firstChild.data if dom_node.firstChild else ""
        }
        self.dad.codeboxes_handler.codebox_insert(curr_buffer.get_iter_at_offset(char_offset),
                                                  codebox_dict,
                                                  codebox_justification=justification,
                                                  text_buffer=curr_buffer)

    def table_deserialize(self, curr_buffer, dom_node):
        """From the XML table text to the SourceBuffer"""
        char_offset = int(dom_node.attributes["char_offset"].value)
        if dom_node.hasAttribute(cons.TAG_JUSTIFICATION): justification = dom_node.attributes[cons.TAG_JUSTIFICATION].value
        else: justification = cons.TAG_PROP_LEFT
        table_dict = {
            'matrix': [],
            'col_min': int(dom_node.attributes['col_min'].value),
            'col_max': int(dom_node.attributes["col_max"].value)
        }
        child_dom_iter = dom_node.firstChild
        while child_dom_iter != None:
            if child_dom_iter.nodeName == "row":
                table_dict['matrix'].append([])
                nephew_dom_iter = child_dom_iter.firstChild
                while nephew_dom_iter != None:
                    if nephew_dom_iter.nodeName == "cell":
                        if nephew_dom_iter.firstChild != None:
                            table_dict['matrix'][-1].append(nephew_dom_iter.firstChild.data)
                        else: table_dict['matrix'][-1].append("")
                    nephew_dom_iter = nephew_dom_iter.nextSibling
            child_dom_iter = child_dom_iter.nextSibling
        self.dad.tables_handler.table_insert(curr_buffer.get_iter_at_offset(char_offset),
                                             table_dict,
                                             table_justification=justification,
                                             text_buffer=curr_buffer)

    def image_deserialize(self, curr_buffer, dom_node, version):
        """From the XML embedded image text to the SourceBuffer"""
        char_offset = int(dom_node.attributes["char_offset"].value)
        if dom_node.hasAttribute(cons.TAG_JUSTIFICATION): justification = dom_node.attributes[cons.TAG_JUSTIFICATION].value
        else: justification = cons.TAG_PROP_LEFT
        if dom_node.hasAttribute("anchor"):
            pixbuf = gtk.gdk.pixbuf_new_from_file_at_size(cons.ANCHOR_CHAR, self.dad.anchor_size, self.dad.anchor_size)
            pixbuf.anchor = dom_node.attributes["anchor"].value
        elif dom_node.hasAttribute("filename"):
            pixbuf = gtk.gdk.pixbuf_new_from_file_at_size(cons.FILE_CHAR, self.dad.embfile_size, self.dad.embfile_size)
            pixbuf.filename = dom_node.attributes["filename"].value
            pixbuf.embfile = base64.b64decode(dom_node.firstChild.data)
            pixbuf.time = float(dom_node.attributes["time"].value) if dom_node.hasAttribute("time") else 0
        else:
            if version == 2: pixbuf = get_pixbuf_from_encoded_buffer(dom_node.firstChild.data)
            else: pixbuf = get_pixbuf_from_png_encoded_string(dom_node.firstChild.data)
        if pixbuf:
            pixbuf.link = dom_node.attributes["link"].value if dom_node.hasAttribute("link") else ""
            self.dad.image_insert(curr_buffer.get_iter_at_offset(char_offset),
                pixbuf,
                image_justification=justification,
                text_buffer=curr_buffer)

    def rich_text_deserialize(self, curr_buffer, dom_node, discard_ids=None):
        """From the XML rich text to the SourceBuffer"""
        if dom_node.firstChild:
            text = dom_node.firstChild.data
            tag_names = []
            for tag_property in cons.TAG_PROPERTIES:
                if dom_node.hasAttribute(tag_property):
                    property_value = dom_node.attributes[tag_property].value
                    if property_value:
                        if discard_ids is not None and property_value.startswith(cons.LINK_TYPE_NODE):
                            property_value_vec = property_value.split()
                            original_id = int(property_value_vec[1])
                            imported_id = self.dad.node_id_get(original_id, discard_ids)
                            property_value_vec[1] = str(imported_id)
                            property_value = cons.CHAR_SPACE.join(property_value_vec)
                            #print original_id, imported_id
                        tag_names.append(self.dad.apply_tag_exist_or_create(tag_property, property_value))
            tags_num = len(tag_names)
            if tags_num == 0: curr_buffer.insert(curr_buffer.get_end_iter(), text)
            else: curr_buffer.insert_with_tags_by_name(curr_buffer.get_end_iter(), text, *tag_names)

    def treestore_node_to_dom(self, node_iter):
        """Given a treestore iter returns the CherryTree rich text"""
        if "dom" in dir(self): del self.dom
        self.dom = xml.dom.minidom.Document()
        self.append_dom_node(node_iter, self.dom, to_disk=False, skip_children=True)
        return self.dom.toxml()

    def treestore_sel_node_only_to_dom(self, tree_iter, sel_range=None):
        """Parse the Given Node and Generate an XML Cherry Tree Document"""
        if "dom" in dir(self): del self.dom
        self.dom = xml.dom.minidom.Document()
        cherrytree = self.dom.createElement(cons.APP_NAME)
        self.dom.appendChild(cherrytree)
        # given node parsing
        self.append_dom_node(tree_iter, cherrytree, to_disk=True, skip_children=True, sel_range=sel_range)
        return self.dom.toxml()

    def treestore_sel_node_and_subnodes_to_dom(self, tree_iter):
        """Parse the Given Node and Subnodes and Generate an XML Cherry Tree Document"""
        if "dom" in dir(self): del self.dom
        self.dom = xml.dom.minidom.Document()
        cherrytree = self.dom.createElement(cons.APP_NAME)
        self.dom.appendChild(cherrytree)
        # given node and subnodes parsing
        self.append_dom_node(tree_iter, cherrytree, to_disk=True)
        return self.dom.toxml()

    def treestore_to_dom(self):
        """Parse the Tree and Generate an XML Cherry Tree Document"""
        if "dom" in dir(self): del self.dom
        self.dom = xml.dom.minidom.Document()
        cherrytree = self.dom.createElement(cons.APP_NAME)
        self.dom.appendChild(cherrytree)
        # bookmarks first
        self.append_bookmarks(cherrytree)
        # full tree parsing
        tree_iter = self.dad.treestore.get_iter_first()
        while tree_iter != None:
            self.append_dom_node(tree_iter, cherrytree, to_disk=True)
            tree_iter = self.dad.treestore.iter_next(tree_iter)
        return self.dom.toprettyxml()

    def append_bookmarks(self, dom_father):
        """Adds the bookmarks data to the DOM"""
        if len(self.dad.bookmarks) == 0: return
        dom_iter = self.dom.createElement("bookmarks")
        dom_iter.setAttribute("list", ",".join(self.dad.bookmarks))
        dom_father.appendChild(dom_iter)

    def append_dom_node(self, tree_iter, dom_father, to_disk, skip_children=False, sel_range=None):
        """Given the tree_iter node, adds it to the DOM"""
        dom_iter = self.dom.createElement("node")
        dom_iter.setAttribute("name", self.dad.treestore[tree_iter][1])
        dom_iter.setAttribute("unique_id", str(self.dad.treestore[tree_iter][3]))
        programming_language = self.dad.treestore[tree_iter][4]
        dom_iter.setAttribute("prog_lang", programming_language)
        dom_iter.setAttribute("tags", self.dad.treestore[tree_iter][6])
        dom_iter.setAttribute("readonly", str(self.dad.treestore[tree_iter][7]))
        dom_iter.setAttribute("custom_icon_id", str(self.dad.treestore[tree_iter][9]))
        dom_iter.setAttribute("is_bold", str(support.get_pango_is_bold(self.dad.treestore[tree_iter][10])))
        dom_iter.setAttribute("ts_creation", str(self.dad.treestore[tree_iter][12]))
        dom_iter.setAttribute("ts_lastsave", str(self.dad.treestore[tree_iter][13]))
        foreground = self.dad.treestore[tree_iter][11]
        if not foreground: foreground = ""
        dom_iter.setAttribute("foreground", foreground)
        dom_father.appendChild(dom_iter)
        # allocate and init the rich text attributes
        self.curr_attributes = {}
        for tag_property in cons.TAG_PROPERTIES: self.curr_attributes[tag_property] = ""
        curr_buffer = self.dad.get_textbuffer_from_tree_iter(tree_iter)
        if not sel_range:
            start_iter = curr_buffer.get_start_iter()
            end_iter = curr_buffer.get_end_iter()
        else:
            start_iter = curr_buffer.get_iter_at_offset(sel_range[0])
            end_iter = curr_buffer.get_iter_at_offset(sel_range[1])
        if programming_language == cons.RICH_TEXT_ID:
            # rich text insert
            curr_iter = start_iter.copy()
            self.rich_text_attributes_update(curr_iter, self.curr_attributes)
            tag_found = curr_iter.forward_to_tag_toggle(None)
            while tag_found:
                if not self.tag_richtext_toggling_on_or_off(curr_iter):
                    if not curr_iter.forward_char(): tag_found = False
                    else: tag_found = curr_iter.forward_to_tag_toggle(None)
                    continue
                self.rich_txt_serialize(dom_iter, start_iter, curr_iter, self.curr_attributes)
                if curr_iter.compare(end_iter) >= 0: break
                else:
                    self.rich_text_attributes_update(curr_iter, self.curr_attributes)
                    offset_old = curr_iter.get_offset()
                    start_iter.set_offset(offset_old)
                    tag_found = curr_iter.forward_to_tag_toggle(None)
                    if curr_iter.get_offset() == offset_old: break
            else: self.rich_txt_serialize(dom_iter, start_iter, curr_iter, self.curr_attributes)
            # in case of writing to disk it's time to serialize the info about the images
            if to_disk == True:
                pixbuf_table_codebox_vector = self.dad.state_machine.get_embedded_pixbufs_tables_codeboxes(curr_buffer, sel_range=sel_range)
                # pixbuf_table_codebox_vector is [ [ "pixbuf"/"table"/"codebox", [offset, pixbuf, alignment] ],... ]
                for element in pixbuf_table_codebox_vector:
                    if sel_range: element[1][0] -= sel_range[0]
                    if element[0] == "pixbuf": self.pixbuf_element_to_xml(element[1], dom_iter, self.dom)
                    elif element[0] == "table": self.table_element_to_xml(element[1], dom_iter, self.dom)
                    elif element[0] == "codebox": self.codebox_element_to_xml(element[1], dom_iter, self.dom)
        else:
            # plain text insert
            self.rich_txt_serialize(dom_iter, start_iter, end_iter, self.curr_attributes)
        if not skip_children:
            tree_iter = self.dad.treestore.iter_children(tree_iter) # check for children
            while tree_iter != None:
                self.append_dom_node(tree_iter, dom_iter, to_disk)
                tree_iter = self.dad.treestore.iter_next(tree_iter)

    def codebox_element_to_xml(self, element, dom_node, dom):
        """From element [char_offset, codebox, justification] to dom node"""
        dom_iter = dom.createElement("codebox")
        dom_iter.setAttribute("char_offset", str(element[0]))
        if element[2] != cons.TAG_PROP_LEFT: dom_iter.setAttribute(cons.TAG_JUSTIFICATION, element[2])
        dom_iter.setAttribute("frame_width", str(element[1]['frame_width']))
        dom_iter.setAttribute("frame_height", str(element[1]['frame_height']))
        dom_iter.setAttribute("width_in_pixels", str(element[1]['width_in_pixels']))
        dom_iter.setAttribute("syntax_highlighting", str(element[1]['syntax_highlighting']))
        dom_iter.setAttribute("highlight_brackets", str(element[1]['highlight_brackets']))
        dom_iter.setAttribute("show_line_numbers", str(element[1]['show_line_numbers']))
        dom_node.appendChild(dom_iter)
        text_iter = dom.createTextNode(element[1]['fill_text'])
        dom_iter.appendChild(text_iter)

    def table_element_to_xml(self, element, dom_node, dom):
        """From element [char_offset, table, justification] to dom node"""
        dom_iter = dom.createElement("table")
        dom_iter.setAttribute("char_offset", str(element[0]))
        if element[2] != cons.TAG_PROP_LEFT: dom_iter.setAttribute(cons.TAG_JUSTIFICATION, element[2])
        dom_iter.setAttribute("col_min", str(element[1]['col_min']))
        dom_iter.setAttribute("col_max", str(element[1]['col_max']))
        dom_node.appendChild(dom_iter)
        for row in element[1]['matrix']:
            dom_row = dom.createElement("row")
            dom_iter.appendChild(dom_row)
            for cell in row:
                dom_cell = dom.createElement("cell")
                dom_row.appendChild(dom_cell)
                text_iter = dom.createTextNode(cell)
                dom_cell.appendChild(text_iter)

    def pixbuf_element_to_xml(self, element, dom_node, dom):
        """From element [char_offset, pixbuf, justification] to dom node"""
        dom_iter = dom.createElement("encoded_png")
        dom_iter.setAttribute("char_offset", str(element[0]))
        if element[2] != cons.TAG_PROP_LEFT: dom_iter.setAttribute(cons.TAG_JUSTIFICATION, element[2])
        pixbuf_attrs = dir(element[1])
        if "anchor" in pixbuf_attrs:
            dom_iter.setAttribute("anchor", element[1].anchor)
            dom_node.appendChild(dom_iter)
            text_iter = dom.createTextNode("anchor")
        elif "filename" in pixbuf_attrs:
            dom_iter.setAttribute("filename", element[1].filename)
            dom_node.appendChild(dom_iter)
            text_iter = dom.createTextNode(base64.b64encode(element[1].embfile))
            if "time" in dir(element[1]) and element[1].time:
                dom_iter.setAttribute("time", str(element[1].time))
        else:
            if "link" in dir(element[1]) and element[1].link:
                dom_iter.setAttribute("link", element[1].link)
            dom_node.appendChild(dom_iter)
            text_iter = dom.createTextNode(get_encoded_buffer_from_pixbuf(element[1]))
        dom_iter.appendChild(text_iter)

    def rich_txt_serialize(self, dom_node, start_iter, end_iter, curr_attributes, change_case="n", dom=None):
        """Appends a new SourceBuffer part to the XML rich text"""
        if not dom: dom = self.dom
        dom_iter = dom.createElement("rich_text")
        for tag_property in cons.TAG_PROPERTIES:
            if curr_attributes[tag_property] != "":
                dom_iter.setAttribute(tag_property, curr_attributes[tag_property])
        dom_node.appendChild(dom_iter)
        slot_text = start_iter.get_text(end_iter)
        if change_case != "n":
            if change_case == "l": slot_text = slot_text.lower()
            elif change_case == "u": slot_text = slot_text.upper()
            elif change_case == "t": slot_text = slot_text.swapcase()
        text_iter = dom.createTextNode(slot_text)
        dom_iter.appendChild(text_iter)

    def tag_richtext_toggling_on_or_off(self, curr_iter):
        """Check for tag rich text toggle on or off"""
        toggled_onoff = []
        toggled_off = curr_iter.get_toggled_tags(toggled_on=False)
        toggled_on = curr_iter.get_toggled_tags(toggled_on=True)
        if toggled_off: toggled_onoff.extend(toggled_off)
        if toggled_on: toggled_onoff.extend(toggled_on)
        for tag in toggled_onoff:
            tag_name = tag.get_property("name")
            if not tag_name: continue
            if tag_name.startswith("weight_") \
            or tag_name.startswith("foreground_") \
            or tag_name.startswith("background_") \
            or tag_name.startswith("style_") \
            or tag_name.startswith("underline_") \
            or tag_name.startswith("strikethrough_") \
            or tag_name.startswith("scale_") \
            or tag_name.startswith("justification_") \
            or tag_name.startswith("link_") \
            or tag_name.startswith("family_"):
                return True
        return False

    def rich_text_attributes_update(self, curr_iter, curr_attributes):
        """Updates the list of Attributes for the Current Slice"""
        toggled_off = curr_iter.get_toggled_tags(toggled_on=False)
        for tag in toggled_off:
            tag_name = tag.get_property("name")
            if tag_name and tag_name != cons.GTKSPELLCHECK_TAG_NAME:
                if tag_name.startswith("weight_"): curr_attributes[cons.TAG_WEIGHT] = ""
                elif tag_name.startswith("foreground_"): curr_attributes[cons.TAG_FOREGROUND] = ""
                elif tag_name.startswith("background_"): curr_attributes[cons.TAG_BACKGROUND] = ""
                elif tag_name.startswith("style_"): curr_attributes[cons.TAG_STYLE] = ""
                elif tag_name.startswith("underline_"): curr_attributes[cons.TAG_UNDERLINE] = ""
                elif tag_name.startswith("strikethrough_"): curr_attributes[cons.TAG_STRIKETHROUGH] = ""
                elif tag_name.startswith("scale_"): curr_attributes[cons.TAG_SCALE] = ""
                elif tag_name.startswith("justification_"): curr_attributes[cons.TAG_JUSTIFICATION] = ""
                elif tag_name.startswith("link_"): curr_attributes[cons.TAG_LINK] = ""
                elif tag_name.startswith("family_"): curr_attributes[cons.TAG_FAMILY] = ""
                else: support.dialog_error("Failure processing the toggling OFF tag %s" % tag_name, self.dad.window)
        toggled_on = curr_iter.get_toggled_tags(toggled_on=True)
        for tag in toggled_on:
            tag_name = tag.get_property("name")
            if tag_name and tag_name != cons.GTKSPELLCHECK_TAG_NAME:
                if tag_name.startswith("weight_"): curr_attributes[cons.TAG_WEIGHT] = tag_name[7:]
                elif tag_name.startswith("foreground_"): curr_attributes[cons.TAG_FOREGROUND] = tag_name[11:]
                elif tag_name.startswith("background_"): curr_attributes[cons.TAG_BACKGROUND] = tag_name[11:]
                elif tag_name.startswith("scale_"): curr_attributes[cons.TAG_SCALE] = tag_name[6:]
                elif tag_name.startswith("justification_"): curr_attributes[cons.TAG_JUSTIFICATION] = tag_name[14:]
                elif tag_name.startswith("style_"): curr_attributes[cons.TAG_STYLE] = tag_name[6:]
                elif tag_name.startswith("underline_"): curr_attributes[cons.TAG_UNDERLINE] = tag_name[10:]
                elif tag_name.startswith("strikethrough_"): curr_attributes[cons.TAG_STRIKETHROUGH] = tag_name[14:]
                elif tag_name.startswith("link_"): curr_attributes[cons.TAG_LINK] = tag_name[5:]
                elif tag_name.startswith("family_"): curr_attributes[cons.TAG_FAMILY] = tag_name[7:]
                else: support.dialog_error("Failure processing the toggling ON tag %s" % tag_name, self.dad.window)

    def toc_insert_all(self, text_buffer, top_tree_iter):
        """Insert a TOC at top of text_buffer, including Node and Subnodes starting from top_tree_iter"""
        config.get_tree_expanded_collapsed_string(self.dad)
        starting_tree_iter = self.dad.curr_tree_iter.copy()
        if top_tree_iter: toc_list_per_node = self.toc_insert_all_iter(top_tree_iter)
        else:
            top_tree_iter = self.dad.treestore.get_iter_first()
            toc_list_per_node = []
            while top_tree_iter != None:
                toc_list_per_node.extend(self.toc_insert_all_iter(top_tree_iter))
                top_tree_iter = self.dad.treestore.iter_next(top_tree_iter)
        config.set_tree_expanded_collapsed_string(self.dad)
        self.dad.treeview_safe_set_cursor(starting_tree_iter)
        self.dad.objects_buffer_refresh()
        #print toc_list_per_node
        curr_node_id = -1
        curr_node_level = 0
        if toc_list_per_node:
            tag_property = cons.TAG_LINK
            curr_offset = 0
            text_buffer.insert(text_buffer.get_iter_at_offset(curr_offset), cons.CHAR_NEWLINE)
            curr_offset += 1
            for element in toc_list_per_node:
                property_value = cons.LINK_TYPE_NODE + cons.CHAR_SPACE + str(element[2])
                if curr_node_id != element[2]:
                    curr_node_id = element[2]
                    node_tree_iter = self.dad.get_tree_iter_from_node_id(curr_node_id)
                    curr_node_level = self.dad.treestore.iter_depth(node_tree_iter)
                    node_name = self.dad.treestore[node_tree_iter][1].replace(cons.CHAR_NEWLINE, cons.CHAR_SPACE).replace(cons.CHAR_CR, "")
                    tag_names = [self.dad.apply_tag_exist_or_create(tag_property, property_value)]
                    text_buffer.insert(text_buffer.get_iter_at_offset(curr_offset), 2*curr_node_level*cons.CHAR_SPACE + self.dad.chars_toc[0] + cons.CHAR_SPACE)
                    curr_offset += 2 + 2*curr_node_level
                    text_buffer.insert(text_buffer.get_iter_at_offset(curr_offset), cons.CHAR_NEWLINE)
                    text_buffer.insert_with_tags_by_name(text_buffer.get_iter_at_offset(curr_offset), node_name, *tag_names)
                    curr_offset += 1
                    while text_buffer.get_iter_at_offset(curr_offset).get_char() != cons.CHAR_NEWLINE:
                        curr_offset += 1
                    curr_offset += 1
                tag_names = [self.dad.apply_tag_exist_or_create(tag_property, property_value + cons.CHAR_SPACE + element[0])]
                if not element[0]: continue
                if element[0][:2] == cons.TAG_PROP_H1:
                    text_buffer.insert(text_buffer.get_iter_at_offset(curr_offset), (2+2*curr_node_level)*cons.CHAR_SPACE + self.dad.chars_toc[1] + cons.CHAR_SPACE)
                    curr_offset += 4 + 2*curr_node_level
                elif element[0][:2] == cons.TAG_PROP_H2:
                    text_buffer.insert(text_buffer.get_iter_at_offset(curr_offset), (4+2*curr_node_level)*cons.CHAR_SPACE + self.dad.chars_toc[2] + cons.CHAR_SPACE)
                    curr_offset += 6 + 2*curr_node_level
                else:
                    text_buffer.insert(text_buffer.get_iter_at_offset(curr_offset), (6+2*curr_node_level)*cons.CHAR_SPACE + self.dad.chars_toc[3] + cons.CHAR_SPACE)
                    curr_offset += 8 + 2*curr_node_level
                text_buffer.insert(text_buffer.get_iter_at_offset(curr_offset), cons.CHAR_NEWLINE)
                text_buffer.insert_with_tags_by_name(text_buffer.get_iter_at_offset(curr_offset), element[1], *tag_names)
                curr_offset += 1
                while text_buffer.get_iter_at_offset(curr_offset).get_char() != cons.CHAR_NEWLINE:
                    curr_offset += 1
                curr_offset += 1
            text_buffer.insert(text_buffer.get_iter_at_offset(curr_offset), cons.CHAR_NEWLINE)
        return toc_list_per_node

    def toc_insert_all_iter(self, top_tree_iter):
        """Iterate on nodes for toc_insert_all"""
        self.dad.treeview_safe_set_cursor(top_tree_iter)
        node_id = self.dad.treestore[top_tree_iter][3]
        text_buffer = self.dad.get_textbuffer_from_tree_iter(top_tree_iter)
        toc_list_per_node = []
        toc_list_this_one = self.toc_insert_one(text_buffer, node_id, just_get_toc_list=True)
        toc_list_per_node.extend(toc_list_this_one or [["", "", node_id]])
        child_tree_iter = self.dad.treestore.iter_children(top_tree_iter)
        while child_tree_iter != None:
            toc_list_per_node.extend(self.toc_insert_all_iter(child_tree_iter))
            child_tree_iter = self.dad.treestore.iter_next(child_tree_iter)
        return toc_list_per_node

    def tag_h_in_given_iter(self, given_iter):
        """Check for tag header in given_iter"""
        for tag in given_iter.get_tags():
            tag_name = tag.get_property("name")
            if tag_name.startswith("scale_") and tag_name[6:] in [cons.TAG_PROP_H1, cons.TAG_PROP_H2, cons.TAG_PROP_H3]:
                return True
        return False

    def safe_forward_to_h_toggle(self, curr_iter):
        """Forward to the Toggle of a scale tag"""
        if self.curr_attributes[cons.TAG_SCALE] in [cons.TAG_PROP_H1, cons.TAG_PROP_H2, cons.TAG_PROP_H3]:
            # ON to OFF
            if not self.tag_h_in_given_iter(curr_iter): return True
            while curr_iter.forward_char():
                if not self.tag_h_in_given_iter(curr_iter): return True
            return True # at least at the buffer end, the tag will go off
        else:
            # OFF to ON
            if self.tag_h_in_given_iter(curr_iter): return True
            while curr_iter.forward_char():
                if self.tag_h_in_given_iter(curr_iter): return True
        return False

    def toc_insert_one(self, text_buffer, node_id, just_get_toc_list=False):
        """Given the text_buffer, inserts the Table Of Contents"""
        self.curr_attributes = {}
        self.toc_counters = {cons.TAG_PROP_H1:0, cons.TAG_PROP_H2:0, cons.TAG_PROP_H3:0}
        self.toc_list = [] # 0: anchor name; 1: text in h1, h2 or h3; 2:node id
        for tag_property in cons.TAG_PROPERTIES: self.curr_attributes[tag_property] = ""
        start_iter = text_buffer.get_start_iter()
        end_iter = text_buffer.get_end_iter()
        curr_iter = start_iter.copy()
        self.rich_text_attributes_update(curr_iter, self.curr_attributes)
        tag_found = self.safe_forward_to_h_toggle(curr_iter)
        while tag_found:
            offsets = self.toc_insert_parser(text_buffer, start_iter, curr_iter, node_id)
            if offsets:
                start_iter = text_buffer.get_iter_at_offset(offsets[0])
                curr_iter = text_buffer.get_iter_at_offset(offsets[1])
                end_iter = text_buffer.get_end_iter()
            if curr_iter.compare(end_iter) == 0: break
            else:
                self.rich_text_attributes_update(curr_iter, self.curr_attributes)
                offset_old = curr_iter.get_offset()
                start_iter.set_offset(offset_old)
                tag_found = self.safe_forward_to_h_toggle(curr_iter)
                if curr_iter.get_offset() == offset_old: break
        else: self.toc_insert_parser(text_buffer, start_iter, curr_iter, node_id)
        if self.toc_list and not just_get_toc_list:
            tag_property = cons.TAG_LINK
            property_value = cons.LINK_TYPE_NODE + cons.CHAR_SPACE + str(node_id)
            curr_offset = 0
            text_buffer.insert(text_buffer.get_iter_at_offset(curr_offset), cons.CHAR_NEWLINE)
            curr_offset += 1
            for element in self.toc_list:
                tag_names = []
                tag_names.append(self.dad.apply_tag_exist_or_create(tag_property, property_value + cons.CHAR_SPACE + element[0]))
                if element[0][:2] == cons.TAG_PROP_H1:
                    text_buffer.insert(text_buffer.get_iter_at_offset(curr_offset), self.dad.chars_toc[1] + cons.CHAR_SPACE)
                    curr_offset += 2
                elif element[0][:2] == cons.TAG_PROP_H2:
                    text_buffer.insert(text_buffer.get_iter_at_offset(curr_offset), 2*cons.CHAR_SPACE + self.dad.chars_toc[2] + cons.CHAR_SPACE)
                    curr_offset += 4
                else:
                    text_buffer.insert(text_buffer.get_iter_at_offset(curr_offset), 4*cons.CHAR_SPACE + self.dad.chars_toc[3] + cons.CHAR_SPACE)
                    curr_offset += 6
                text_buffer.insert(text_buffer.get_iter_at_offset(curr_offset), cons.CHAR_NEWLINE)
                text_buffer.insert_with_tags_by_name(text_buffer.get_iter_at_offset(curr_offset), element[1], *tag_names)
                curr_offset += 1
                while text_buffer.get_iter_at_offset(curr_offset).get_char() != cons.CHAR_NEWLINE:
                    curr_offset += 1
                curr_offset += 1
            text_buffer.insert(text_buffer.get_iter_at_offset(curr_offset), cons.CHAR_NEWLINE)
        return self.toc_list

    def toc_insert_parser(self, text_buffer, start_iter, end_iter, node_id):
        """Parses a Tagged String for the TOC insert"""
        if self.curr_attributes[cons.TAG_SCALE] not in [cons.TAG_PROP_H1, cons.TAG_PROP_H2, cons.TAG_PROP_H3]: return None
        start_offset = start_iter.get_offset()
        end_offset = end_iter.get_offset()
        if self.curr_attributes[cons.TAG_SCALE] == cons.TAG_PROP_H1:
            self.toc_counters[cons.TAG_PROP_H1] += 1
            self.toc_list.append(["h1-%d" % self.toc_counters[cons.TAG_PROP_H1], text_buffer.get_text(start_iter, end_iter), node_id])
        elif self.curr_attributes[cons.TAG_SCALE] == cons.TAG_PROP_H2:
            self.toc_counters[cons.TAG_PROP_H2] += 1
            self.toc_list.append(["h2-%d" % self.toc_counters[cons.TAG_PROP_H2], text_buffer.get_text(start_iter, end_iter), node_id])
        else:
            self.toc_counters[cons.TAG_PROP_H3] += 1
            self.toc_list.append(["h3-%d" % self.toc_counters[cons.TAG_PROP_H3], text_buffer.get_text(start_iter, end_iter), node_id])
        anchor_start = start_iter.copy()
        if anchor_start.backward_char():
            anchor = anchor_start.get_child_anchor()
            if anchor and "pixbuf" in dir(anchor) and "anchor" in dir(anchor.pixbuf):
                text_buffer.delete(anchor_start, start_iter)
                start_offset -= 1
                end_offset -= 1
                start_iter = text_buffer.get_iter_at_offset(start_offset)
        pixbuf = gtk.gdk.pixbuf_new_from_file_at_size(cons.ANCHOR_CHAR, self.dad.anchor_size, self.dad.anchor_size)
        pixbuf.anchor = self.toc_list[-1][0]
        self.dad.image_insert(start_iter, pixbuf)
        self.dad.ctdb_handler.pending_edit_db_node_buff(node_id, force_user_active=True)
        return (start_offset+1, end_offset+1)


class StateMachine:
    """The State Machine for the TextBuffer Ctrl+Z / Ctrl+Y Utility"""

    def __init__(self, dad):
        """Machine boot"""
        self.dad = dad
        self.nodes_vectors = {}
        self.nodes_indexes = {}
        self.nodes_indicators = {}
        self.visited_nodes_list = []
        self.visited_nodes_idx = 0
        # indicator 0 -> current text in node_vector matches the textbuffer
        # indicator 1 -> textbuffer is ahead, but only of non alphanumeric chars
        # indicator 2 -> textbuffer is ahead with alphanumeric chars
        self.not_undoable_timeslot_set(False)

    def get_embedded_pixbufs_tables_codeboxes(self, text_buffer, for_print=0, sel_range=None):
        """Retrieve the list of Images Embedded into the Buffer"""
        pixbuf_table_codebox_vector = []
        if sel_range: curr_iter = text_buffer.get_iter_at_offset(sel_range[0])
        else: curr_iter = text_buffer.get_start_iter()
        while 1:
            anchor = curr_iter.get_child_anchor()
            if anchor:
                anchor_dir = dir(anchor)
                if "pixbuf" in anchor_dir:
                    if for_print != 1 or not "anchor" in dir(anchor.pixbuf):
                        pixbuf_table_codebox_vector.append(["pixbuf", [curr_iter.get_offset(),
                                                            anchor.pixbuf,
                                                            self.get_iter_alignment(curr_iter)] ])
                elif "liststore" in anchor_dir:
                    pixbuf_table_codebox_vector.append(["table", [curr_iter.get_offset(),
                                                        self.table_to_dict(anchor),
                                                        self.get_iter_alignment(curr_iter)] ])
                elif "sourcebuffer" in anchor_dir:
                    pixbuf_table_codebox_vector.append(["codebox", [curr_iter.get_offset(),
                                                        self.codebox_to_dict(anchor, for_print),
                                                        self.get_iter_alignment(curr_iter)] ])
            if not curr_iter.forward_char(): break
            if sel_range and curr_iter.get_offset() > sel_range[1]: break
        return pixbuf_table_codebox_vector

    def table_to_dict(self, anchor):
        """Given an Anchor, Returns the Embedded Table as a dictionary"""
        table_dict = {'matrix':[], 'col_min': anchor.table_col_min, 'col_max': anchor.table_col_max}
        columns_num = len(anchor.headers)
        tree_iter = anchor.liststore.get_iter_first()
        while tree_iter != None:
            row = []
            for column in range(columns_num): row.append(anchor.liststore[tree_iter][column])
            table_dict['matrix'].append(row)
            tree_iter = anchor.liststore.iter_next(tree_iter)
        table_dict['matrix'].append(copy.deepcopy(anchor.headers))
        return table_dict

    def codebox_to_dict(self, anchor, for_print):
        """Given an Anchor, Returns the Embedded Codebox as a dictionary"""
        codebox_dict = {
        'frame_width': anchor.frame_width,
        'frame_height': anchor.frame_height,
        'width_in_pixels': anchor.width_in_pixels,
        'syntax_highlighting': anchor.syntax_highlighting,
        'highlight_brackets': anchor.highlight_brackets,
        'show_line_numbers': anchor.show_line_numbers,
        'fill_text': ""
        }
        if for_print == 1:
            pango_handler = exports.Export2Pango(self)
            codebox_dict['fill_text'] = pango_handler.pango_get_from_code_buffer(anchor.sourcebuffer)
        elif for_print == 2:
            codebox_dict['fill_text'] = self.dad.html_handler.html_get_from_code_buffer(anchor.sourcebuffer)
        else: codebox_dict['fill_text'] = anchor.sourcebuffer.get_text(*anchor.sourcebuffer.get_bounds())
        return codebox_dict

    def get_iter_alignment(self, iter_text):
        """Get the Alignment Value of the given Iter"""
        align_center = self.dad.apply_tag_exist_or_create(cons.TAG_JUSTIFICATION, cons.TAG_PROP_CENTER)
        if iter_text.has_tag(self.dad.tag_table.lookup(align_center)):
            return cons.TAG_PROP_CENTER
        align_fill = self.dad.apply_tag_exist_or_create(cons.TAG_JUSTIFICATION, cons.TAG_PROP_FILL)
        if iter_text.has_tag(self.dad.tag_table.lookup(align_fill)):
            return cons.TAG_PROP_FILL
        align_right = self.dad.apply_tag_exist_or_create(cons.TAG_JUSTIFICATION, cons.TAG_PROP_RIGHT)
        if iter_text.has_tag(self.dad.tag_table.lookup(align_right)):
            return cons.TAG_PROP_RIGHT
        return cons.TAG_PROP_LEFT

    def load_embedded_image_element(self, text_buffer, element):
        """Load an Image from the Embedded Vector into the Buffer"""
        iter_insert = text_buffer.get_iter_at_offset(element[0])
        self.dad.image_insert(iter_insert, element[1], element[2], text_buffer=text_buffer)

    def load_embedded_table_element(self, text_buffer, element):
        """Load a Table from the Embedded Vector into the Buffer"""
        iter_insert = text_buffer.get_iter_at_offset(element[0])
        self.dad.tables_handler.table_insert(iter_insert, element[1], element[2], text_buffer=text_buffer)

    def load_embedded_codebox_element(self, text_buffer, element):
        """Load a CodeBox from the Embedded Vector into the Buffer"""
        iter_insert = text_buffer.get_iter_at_offset(element[0])
        codebox_dict = {
        'frame_width': element[1]['frame_width'],
        'frame_height': element[1]['frame_height'],
        'width_in_pixels': element[1]['width_in_pixels'],
        'syntax_highlighting': element[1]['syntax_highlighting'],
        'highlight_brackets': element[1]['highlight_brackets'],
        'show_line_numbers': element[1]['show_line_numbers'],
        'fill_text': element[1]['fill_text']
        }
        self.dad.codeboxes_handler.codebox_insert(iter_insert,
                                                  codebox_dict,
                                                  codebox_justification=element[2],
                                                  text_buffer=text_buffer)

    def apply_object_justification(self, iter_start, justification, text_buffer):
        """Apply the Proper Justification to an Image"""
        if justification == None: return
        iter_end = iter_start.copy()
        iter_end.forward_char()
        self.dad.apply_tag(cons.TAG_JUSTIFICATION,
                           justification,
                           iter_sel_start=iter_start,
                           iter_sel_end=iter_end,
                           text_buffer=text_buffer)

    def reset(self):
        """State Machine Reset"""
        self.nodes_vectors = {}
        self.nodes_indexes = {}
        self.nodes_indicators = {}
        self.visited_nodes_list = []
        self.visited_nodes_idx = 0

    def requested_visited_previous(self):
        """Requested the Previous Visited Node"""
        if self.visited_nodes_idx != None and self.visited_nodes_idx > 0:
            self.visited_nodes_idx -= 1
            return self.visited_nodes_list[self.visited_nodes_idx]
        else:
            #print "self.visited_nodes_idx", self.visited_nodes_idx
            return None

    def requested_visited_next(self):
        """Requested the Next Visited Node"""
        if self.visited_nodes_idx != None and self.visited_nodes_idx < len(self.visited_nodes_list) - 1:
            self.visited_nodes_idx += 1
            return self.visited_nodes_list[self.visited_nodes_idx]
        else:
            #print "self.visited_nodes_idx", self.visited_nodes_idx
            #print "last_index",  len(self.visited_nodes_list) - 1
            return None

    def node_selected_changed(self, node_id):
        """When a New Node is Selected"""
        if self.dad.user_active and not self.dad.go_bk_fw_click:
            last_index = len(self.visited_nodes_list) - 1
            if self.visited_nodes_idx != last_index: del self.visited_nodes_list[self.visited_nodes_idx+1:last_index+1]
            if node_id in self.visited_nodes_list:
                self.visited_nodes_list.remove(node_id)
            self.visited_nodes_list.append(node_id)
            self.visited_nodes_idx = len(self.visited_nodes_list) - 1
        if node_id not in self.nodes_vectors:
            self.nodes_vectors[node_id] = []
            xml_content = self.dad.xml_handler.treestore_node_to_dom(self.dad.curr_tree_iter)
            pixbuf_table_codebox_vector = self.get_embedded_pixbufs_tables_codeboxes(self.dad.curr_buffer)
            self.nodes_vectors[node_id].append([xml_content, pixbuf_table_codebox_vector, 0])
            self.nodes_indexes[node_id] = 0 # first state
            self.nodes_indicators[node_id] = 0 # the current buffer state is saved

    def text_variation(self, node_id, varied_text):
        """Insertion or Removal of text in the given node_id"""
        if cons.CHAR_NEWLINE in varied_text:
            self.update_state()
            return
        alphanum = re.search("\w", varied_text, re.UNICODE) # we search for an alphanumeric character
        if self.nodes_indicators[node_id] < 2:
            if alphanum != None: self.nodes_indicators[node_id] = 2 # alphanumeric transition
            else: self.nodes_indicators[node_id] = 1 # non alphanumeric transition
        elif alphanum == None: # self.nodes_indicators[node_id] == 2 and non alphanumeric transition
            self.update_state()

    def requested_state_previous(self, node_id):
        """A Previous State, if Existing, is Requested"""
        if self.curr_index_is_last_index(node_id):
            self.update_state()
        if self.nodes_indexes[node_id] > 0:
            self.nodes_indexes[node_id] -= 1
        return self.nodes_vectors[node_id][self.nodes_indexes[node_id]]

    def requested_state_current(self, node_id):
        """The current state is requested"""
        return self.nodes_vectors[node_id][self.nodes_indexes[node_id]]

    def requested_state_subsequent(self, node_id):
        """A Subsequent State, if Existing, is Requested"""
        if self.nodes_indexes[node_id] < (len(self.nodes_vectors[node_id])-1):
            self.nodes_indexes[node_id] += 1
        return self.nodes_vectors[node_id][self.nodes_indexes[node_id]]

    def delete_states(self, node_id):
        """Delete the states for the given node_id"""
        if node_id in self.nodes_indexes: del self.nodes_indexes[node_id]
        if node_id in self.nodes_vectors: del self.nodes_vectors[node_id]
        if node_id in self.nodes_indicators: del self.nodes_indicators[node_id]
        if node_id in self.visited_nodes_list:
            self.visited_nodes_list.remove(node_id)
            self.visited_nodes_idx = len(self.visited_nodes_list)-1

    def curr_index_is_last_index(self, node_id):
        """Are we in the last state?"""
        curr_index = self.nodes_indexes[node_id]
        last_index = len(self.nodes_vectors[node_id]) - 1
        return curr_index == last_index

    def not_undoable_timeslot_set(self, not_undoable_val):
        self._not_undoable_timeslot = not_undoable_val

    def not_undoable_timeslot_get(self):
        return self._not_undoable_timeslot

    def update_state(self):
        """Update the state for the given node_id"""
        if self.dad.syntax_highlighting != cons.RICH_TEXT_ID or self.not_undoable_timeslot_get():
            return
        node_id = self.dad.treestore[self.dad.curr_tree_iter][3]
        if not self.curr_index_is_last_index(node_id):
            del self.nodes_vectors[node_id][self.nodes_indexes[node_id]+1:]
        xml_content = self.dad.xml_handler.treestore_node_to_dom(self.dad.curr_tree_iter)
        pixbuf_table_codebox_vector = self.get_embedded_pixbufs_tables_codeboxes(self.dad.curr_buffer)
        cursor_pos = self.dad.curr_buffer.get_property(cons.STR_CURSOR_POSITION)
        new_state = [xml_content, pixbuf_table_codebox_vector, cursor_pos]
        if len(self.nodes_vectors[node_id]) > 0:
            if new_state == self.nodes_vectors[node_id][-1]:
                #print "update_state not needed"
                return
        self.nodes_vectors[node_id].append(new_state)
        num_saved_states = len(self.nodes_vectors[node_id])
        while num_saved_states > self.dad.limit_undoable_steps:
            self.nodes_vectors[node_id].pop(0)
            num_saved_states -= 1
        self.nodes_indexes[node_id] = num_saved_states - 1
        self.nodes_indicators[node_id] = 0 # the current buffer state is saved

    def update_curr_state_cursor_pos(self, node_id):
        """If the buffer is still not modified update cursor pos"""
        if not node_id in self.nodes_indexes: return
        curr_index = self.nodes_indexes[node_id]
        cursor_pos = self.dad.curr_buffer.get_property(cons.STR_CURSOR_POSITION)
        self.nodes_vectors[node_id][curr_index][2] = cursor_pos
        #print "SM UPD cursor_pos", cursor_pos
