io_node.py

bl_info = {
    "name": "NodeIO",
    "author": "Jacob Morris",
    "version": (0, 6, 0),
    "blender": (2, 79, 0),
    "location": "Node Editor > Properties",
    "description": "Allows The Exporting And Importing Of Node Trees Via .bnodes Files",
    "category": "Import-Export"
    }

# 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, see <http://www.gnu.org/licenses/>.

import bpy
from bpy.props import StringProperty, EnumProperty, BoolProperty
from datetime import datetime
from time import tzname
import operator
from inspect import getmembers
from os import path, mkdir, listdir, walk, remove as remove_file, sep as os_file_sep
from shutil import copyfile, rmtree
import zipfile
from mathutils import *
import json

VERSION = (0, 6, 0)
DEBUG_FILE = False  # makes JSON file more human readable at the cost of file-size
ROUND = 4


def make_list(data):
    out = []
    for i in data:
        if isinstance(i, (bool, str)):
            out.append(i)
        else:  # int, float
            out.append(round(i, ROUND))
    return out


def collect_node_data(n: bpy.types.Node):
    ns, inputs, outputs, dependencies = [], [], [], []
    node_data = {"inputs": inputs, "outputs": outputs, "node_specific": ns, "bl_idname": n.bl_idname}
    is_group = False

    if n.bl_idname in ("ShaderNodeGroup", "TextureNodeGroup") or n.bl_idname[0:11] == "SvGroupNode":
        is_group = True

    # certain nodes that do not support some operations, like having no .inputs or .outputs,
    node_exclude_list = ['NodeReroute', 'NodeGroupInput', 'NodeGroupOutput']
    socket_field_list = ['default_value', "value", "objectName", "fontName", "category", "groupName", "textBlockName",
                         "sequenceName", 'isUsed', 'easeIn', 'easeOut']

    # types that can be converted to lists
    list_types = (Color, Vector, Euler, Quaternion, bpy.types.bpy_prop_array)

    if n.bl_idname not in node_exclude_list:  # Reroute does have in and out, but does not know type until linked
        # inputs
        for j in range(len(n.inputs)):
            socket = n.inputs[j]
            data = {"index": j, "bl_idname": socket.bl_idname, 'values': {}}
            for i in socket_field_list:
                try:
                    val = eval("socket.{}".format(i))
                    if isinstance(val, list_types):  # list
                        data["values"][i] = make_list(val)
                    elif isinstance(val, (str, bool)):
                        data["values"][i] = val
                    elif isinstance(val, (float, int)):
                        data["values"][i] = round(val, ROUND)
                except AttributeError:
                    pass

            if data['values']:
                inputs.append(data)

        # outputs
        for j in range(len(n.outputs)):
            socket = n.outputs[j]
            data = {"index": j, "bl_idname": socket.bl_idname, 'values': {}}
            for i in socket_field_list:
                try:
                    val = eval("socket.{}".format(i))
                    if isinstance(val, list_types):  # list
                        data["values"][i] = make_list(val)
                    elif isinstance(val, (str, bool)):
                        data["values"][i] = val
                    elif isinstance(val, (float, int)):
                        data["values"][i] = round(val, ROUND)
                except AttributeError:
                    pass

            if data['values']:
                outputs.append(data)
    elif n.bl_idname == "NodeGroupInput":
        temp = []
        for i in n.outputs:
            if i.bl_idname != "NodeSocketVirtual":
                temp.append(i.bl_idname)
                temp.append(i.name)
        ns += ["group_input", temp]
    elif n.bl_idname == "NodeGroupOutput":
        temp = []
        for i in n.inputs:
            if i.bl_idname != "NodeSocketVirtual":
                temp.append(i.bl_idname)
                temp.append(i.name)
        ns += ["group_output", temp]

    # list of default values to ignore for smaller file-size, or because not needed, also if property is read-only
    exclude_attributes = {'__doc__', '__module__', '__slots__', 'bl_description', 'bl_height_default', 'bl_height_max',
                          'bl_height_min', 'bl_icon', 'bl_rna', 'bl_static_type', 'bl_width_default', 'bl_width_min',
                          'bl_width_max', 'color_mapping', 'draw_buttons', 'draw_buttons_ext', 'image_user',
                          'input_template', 'inputs', 'internal_links', 'is_registered_node_type', 'bl_label',
                          'output_template', 'outputs', 'poll', 'poll_instance', 'rna_type', 'shading_compatibility',
                          'show_options', 'show_preview', 'show_texture', 'socket_value_update', 'texture_mapping',
                          'type', 'update', 'viewLocation', 'width_hidden', 'bl_idname', 'dimensions',
                          'isAnimationNode', 'evaluationExpression', 'socketIdentifier', 'canCache',
                          'iterateThroughLists', 'identifier', 'scale_off', 'orient_axis', 'generic_enum', 'objects',
                          'particles', 'uv'}

    exclude_nodes = {'SvGetPropNode', "SvSetPropNode"}

    # Manual Attribute Collection ------------------------------------------->>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
    if n.bl_idname[0:11] == "SvGroupNode":
        node_data["monad.name"] = n.monad.name

    # Automatic Attribute Collection ---------------------------------------->>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
    if n.bl_idname not in exclude_nodes:
        for method in getmembers(n):
            if method[0] not in exclude_attributes:
                t = method[1]  # type of value
                val = getattr(n, method[0])  # get value

                # special handling for certain types
                if isinstance(t, list_types):  # TUPLE
                    ns += [method[0], make_list(val)]
                elif isinstance(t, (bpy.types.CurveMapping, bpy.types.ShaderNodeRGBCurve)):  # CURVES
                    if isinstance(t, bpy.types.CurveMapping):
                        if isinstance(n, bpy.types.TextureNodeCurveTime):
                            c = n.curve
                        else:
                            c = n.mapping
                    else:  # happens with n_InterpolationFromCurveMappingNode, has ShaderNodeRGBCurve which has curve
                        c = n.curveNode.mapping
                    curves = [make_list(c.black_level), make_list(c.white_level),
                              str(c.clip_max_x), str(c.clip_max_y), str(c.clip_min_x),
                              str(c.clip_min_y), str(c.use_clip)]

                    for curve in c.curves:
                        points = [curve.extend]
                        for point in curve.points:
                            points.append([make_list(point.location), point.handle_type])
                        curves.append(points)
                    ns += ["mapping", curves]
                elif isinstance(t, bpy.types.ColorRamp):  # COLOR RAMP
                    els = []
                    for j in n.color_ramp.elements:
                        cur_el = [j.position, make_list(j.color)]
                        els.append(cur_el)
                    ns += ["color_ramp.color_mode", n.color_ramp.color_mode, "color_ramp.interpolation",
                           n.color_ramp.interpolation, "color_ramp.elements", els]
                elif isinstance(t, bpy.types.NodeTree):  # NODE TREE
                    ns += ["node_tree.name", val.name]
                elif isinstance(t, bpy.types.Image) and n.image is not None:  # IMAGE
                    ns += ["image", n.image.name]
                    dependencies.append(['image', n.image.name, n.image.filepath])
                elif isinstance(t, bpy.types.ParticleSystem):  # PARTICLE SYSTEM - needs objects and particle system
                    ns += [method[0], [n.object, val.name]]
                elif isinstance(t, (str, bool)):  # STRING
                    ns += [method[0], val]
                elif isinstance(t, (int, float)):  # FlOAT, INTEGER
                    ns += [method[0], round(val, ROUND)]
                elif isinstance(t, bpy.types.Node):  # FRAME NODE
                    ns += [method[0], val.name]
                elif isinstance(t, bpy.types.Texture):  # TEXTURE NODE
                    ns += [method[0], val.name]

    # extra information needed for creating nodes
    if n.bl_idname == 'an_CreateListNode':  # have to determine number of inputs, has to be evaluated after assignedType
        ns += ['an_list_size', len(n.inputs) - 1]
    elif n.bl_idname in ('SvGetPropNode', 'SvSetPropNode'):
        ns += ['prop_name', n.prop_name, 'location', make_list(n.location), 'name', n.name, 'color', make_list(n.color),
               'hide', n.hide]

    return [node_data, is_group, dependencies]


# recursive method that collects all nodes and if group node goes and collects its nodes
# data is added to data in [[nodes, links], [nodes, links]] group by group
def collect_nodes(nodes, links, dependencies, names, name, data):
    m_n = []
    m_l = []
    
    for n in nodes:  # nodes
        out, is_group, im = collect_node_data(n)
        m_n.append(out)
        dependencies.append(im)

        if is_group and n.bl_idname in ("ShaderNodeGroup", "TextureNodeGroup"):
            collect_nodes(n.node_tree.nodes, n.node_tree.links, dependencies, names, n.node_tree.name, data)
        elif is_group and n.bl_idname[0:11] == "SvGroupNode":
            collect_nodes(n.monad.nodes, n.monad.links, dependencies, names, n.monad.name, data)
        
    for l in links:  # links
        out = link_info(l)
        m_l.append(out)
        
    data.append([m_n, m_l])   
    names[name] = len(data) - 1 


def link_info(link):
    out = [link.from_node.name]

    fr = link.from_socket.path_from_id()
    fr = fr.split(".")

    if len(fr) == 3:
        fr = fr[2]
    else:
        fr = fr[1]

    n1 = fr.index("[")
    n2 = fr.index("]")
    ind = int(fr[n1 + 1:n2])
    out.append(ind)
    out.append(link.to_node.name)
    fr = link.to_socket.path_from_id()
    fr = fr.split(".")

    if len(fr) == 3:
        fr = fr[2]
    else:
        fr = fr[1]

    n1 = fr.index("[")
    n2 = fr.index("]")
    ind = int(fr[n1 + 1:n2])
    out.append(ind)

    return out


def export_node_tree(self, context):
    to_export = []
    # export_type = context.scene.node_io_export_type
    export_path = bpy.path.abspath(context.scene.node_io_export_path)
    folder_path = None
    folder_name = None
    node_tree = context.space_data.node_tree

    # check data
    if not export_path:
        self.report({"ERROR"}, "NodeIO: Empty Export Path")
        return
    elif not path.exists(export_path):
        self.report({"ERROR"}, "NodeIO: Export Path '{}' Does Not Exist".format(export_path))
        return
    elif node_tree is None:
        self.report({"ERROR"}, "NodeIO: No Active Node Tree")
        return

    # COLLECT NEED INFORMATION: to_export allows multiple node_trees at a time. Info formatted into dict
    # {"nodes":____, "links":____, "name":____, "bl_idname":_____}
    if node_tree.bl_idname in ("ShaderNodeTree", "MitsubaShaderNodeTree"):
        to_export.append({"nodes": node_tree.nodes, "links": node_tree.links, "name":
                         context.active_object.active_material.name, "bl_idname": node_tree.bl_idname})
    elif node_tree.bl_idname in ("an_AnimationNodeTree", "SverchCustomTreeType"):
        to_export.append({"nodes": node_tree.nodes, "links": node_tree.links, "name": node_tree.name,
                          "bl_idname": node_tree.bl_idname})
    elif node_tree.bl_idname == "TextureNodeTree":
        to_export.append({"nodes": node_tree.nodes, "links": node_tree.links, "name":
            context.active_object.active_material.active_texture.name, "bl_idname": node_tree.bl_idname})

    # create folder if more then one node_tree, or if paths are being made relative and there might be dependencies
    if len(to_export) > 1 or context.scene.node_io_dependency_save_type == "2":
        try:
            if len(to_export) > 1:
                folder_name = "mat_group_{}".format(len(to_export))
            else:
                folder_name = to_export[0]['name']
            folder_path = export_path + os_file_sep + folder_name
            mkdir(folder_path)
        except FileExistsError:
            self.report({"INFO"}, "NodeIO: Directory '{}' Already Exists, Will Add/Overwrite Files In Directory".
                        format(folder_path))
    else:
        folder_path = export_path

    # export materials
    for node_tree in to_export:
        json_root = {}
        names = {}
        data, dependencies = [], []
        m_links, m_nodes = node_tree["links"], node_tree["nodes"]

        # get node data
        collect_nodes(m_nodes, m_links, dependencies, names, "main", data)

        # write data
        # material attribs
        t = datetime.now()
        date_string = "{}/{}/{} at {}:{}:{} in {}".format(t.month, t.day, t.year, t.hour, t.minute,
                                                          t.second, tzname[0])

        node_counter = 0
        for group in names:
            json_root[group] = {'nodes': data[names[group]][0], 'links': data[names[group]][1]}
            node_counter += len(data[names[group]][0])

        # get order of groups
        pre_order = sorted(names.items(), key=operator.itemgetter(1))
        order = [i[0].replace("/", "_") for i in pre_order]
        json_root['__info__'] = {'number_of_nodes': node_counter, 'group_order': order, "render_engine":
                                 context.scene.render.engine, "node_tree_name": node_tree["name"],
                                 "date_created": date_string, "version": VERSION, "node_tree_id":
                                     node_tree["bl_idname"]}

        # dependencies
        depend_out = []  # collect all dependencies to place as attribute of root element so they can be imported first
        duplicates = {}

        # absolute filepaths
        if context.scene.node_io_dependency_save_type == "1":
            json_root['__info__']['path_type'] = "absolute"

            # of format [node, node,...] where each node is [depend, depend,...] and depend is [type, name, path]
            for node in dependencies:
                for depend in node:
                    if depend[1] not in duplicates or depend[1] in duplicates and depend[2] != duplicates[depend[1]]:
                        depend_out.append([depend[0], depend[1], bpy.path.abspath(depend[2])])
                        duplicates[depend[1]] = bpy.path.abspath(depend[2])
        # relative filepaths
        else:
            json_root['__info__']['path_type'] = "relative"

            for node in dependencies:
                for depend in node:
                    if depend[1] not in duplicates:
                        depend_path = bpy.path.abspath(depend[2])
                        depend_out.append([depend[0], depend[1], os_file_sep + depend[1]])
                        copyfile(depend_path, folder_path + os_file_sep + depend[1])
                        duplicates[depend[1]] = depend[1]

        json_root['__info__']['dependencies'] = depend_out
        save_path = folder_path + os_file_sep + node_tree["name"] + ".bnodes"

        # write file
        try:
            file = open(save_path, 'w')
            if DEBUG_FILE:  # make multiple lines and indent if trying to debug
                json.dump(json_root, file, indent=4)
            else:
                json.dump(json_root, file)
            file.close()

            self.report({"INFO"}, "NodeIO: Exported '{}' With {} Nodes And {} Dependencies".format(
                json_root['__info__']['node_tree_name'], json_root['__info__']['number_of_nodes'],
                len(json_root['__info__']['dependencies'])))
        except (PermissionError, FileNotFoundError):
            self.report({"ERROR"}, "NodeIO: Permission Denied '{}', Cannot Continue".format(save_path))
            return

    # zip folder
    if folder_path != export_path and context.scene.node_io_is_compress:  # if folder has been created
        if path.exists(folder_path + ".zip"):  # if zipped file is already there, delete
            remove_file(folder_path + ".zip")

        zf = zipfile.ZipFile(folder_path + ".zip", "w", zipfile.ZIP_DEFLATED)
        for dirname, subdirs, files in walk(folder_path):
            for filename in files:
                zf.write(path.join(dirname, filename), arcname=filename)
        zf.close()

        # delete non-compressed folder
        rmtree(folder_path)


def import_node_tree(self, context):
    if context.scene.node_io_import_type == "1":  # single file
        import_path = bpy.path.abspath(context.scene.node_io_import_path_file)
        folder_path = path.dirname(import_path)
    else:  # all files in folder
        import_path = bpy.path.abspath(context.scene.node_io_import_path_dir)
        folder_path = import_path

    # check file path
    if not import_path:
        self.report({"ERROR"}, "NodeIO: Empty Import Path")
        return
    elif not path.exists(import_path):
        self.report({"ERROR"}, "NodeIO: Filepath '{}' Does Not Exist".format(import_path))
        return
    elif context.scene.node_io_import_type == "1" and not import_path.endswith(".bnodes") and \
            not import_path.endswith('.zip'):
        self.report({"ERROR"}, "NodeIO: Filepath Does Not End With .bnodes")
        return

    # collect filepaths
    import_list = []

    if context.scene.node_io_import_type == "2" and not import_path.endswith('.zip'):  # import all files in folder
        files = listdir(import_path)

        for file in files:
            if file.endswith(".bnodes"):
                import_list.append(import_path + os_file_sep + file)
    elif import_path.endswith('.zip'):
        zip_folder = zipfile.ZipFile(import_path)
        folder_path = path.dirname(import_path) + os_file_sep + path.basename(import_path).split(".")[0]

        try:
            mkdir(folder_path)  # create new folder
        except FileExistsError:
            self.report({"INFO"}, "NodeIO: Folder Already Exists")

        for file_name in zip_folder.namelist():  # open zip file and write it to new directory
            f = open(folder_path + os_file_sep + file_name, 'wb')
            f.write(zip_folder.open(file_name, 'r').read())
            f.close()

            if file_name.endswith('.bnodes'):
                import_list.append(folder_path + os_file_sep + file_name)
    else:
        import_list.append(import_path)

    # for each .bnodes file import and create material
    for file_path in import_list:
        file = open(file_path, 'r')
        root = json.load(file)
        file.close()

        node_tree, nodes, links = None, None, None

        # determine type
        if root['__info__']['node_tree_id'] == 'ShaderNodeTree':
            # make sure in correct render mode
            if root['__info__']['render_engine'] != context.scene.render.engine:
                self.report({"ERROR"}, "NodeIO: Please Switch To '{}' Engine".format(root['__info__']
                                                                                     ['render_engine']))
                return

            node_tree = bpy.data.materials.new(root['__info__']['node_tree_name'])
            node_tree.use_nodes = True
            nodes = node_tree.node_tree.nodes
            links = node_tree.node_tree.links

        elif root['__info__']['node_tree_id'] == "MitsubaShaderNodeTree":
            # make sure in correct render mode
            if root['__info__']['render_engine'] != context.scene.render.engine:
                self.report({"ERROR"}, "NodeIO: Please Switch To '{}' Engine".format(root['__info__']
                                                                                     ['render_engine']))
                return

            node_tree = bpy.data.materials.new(root['__info__']['node_tree_name'])
            context.space_data.node_tree = node_tree
            mitsuba_tree = bpy.data.node_groups.new(name=root['__info__']['node_tree_name'],
                                                    type="MitsubaShaderNodeTree")
            nodes = mitsuba_tree.nodes
            links = mitsuba_tree.links
            node_tree.mitsuba_nodes.nodetree = mitsuba_tree.name

        elif root['__info__']['node_tree_id'] in ("an_AnimationNodeTree", "SverchCustomTreeType"):
            node_tree = bpy.data.node_groups.new(name=root['__info__']['node_tree_name'],
                                                 type=root['__info__']['node_tree_id'])
            context.space_data.node_tree = node_tree
            nodes = node_tree.nodes
            links = node_tree.links

        elif root['__info__']['node_tree_id'] == "TextureNodeTree":
            node_tree = bpy.data.textures.new(name=root['__info__']['node_tree_name'], type='NONE')
            node_tree.use_nodes = True
            nodes = node_tree.node_tree.nodes
            links = node_tree.node_tree.links

        # remove any default nodes
        for i in nodes:
            nodes.remove(i)

        # import dependencies
        dependencies = root['__info__']['dependencies']
        depend_errors = 0

        for depend in dependencies:
            if depend[0] == "image" and depend[1] not in bpy.data.images:
                try:
                    if root['__info__']['path_type'] == "relative":
                        image = bpy.data.images.load(folder_path + os_file_sep + depend[1])
                    else:
                        image = bpy.data.images.load(depend[2])
                    image.name = depend[1]  # set name in-case the image was renamed
                except RuntimeError:
                    depend_errors += 1

        if depend_errors:
            self.report({"ERROR"}, "NodeIO: " + str(depend_errors) + " Dependency(ies) Couldn't Be Loaded")

        # add new nodes
        order = root['__info__']['group_order']
        for group_name in order:
            if group_name not in bpy.data.node_groups or group_name == "main":  # create only if needed
                group = root[group_name]

                # set up which node tree to use (used for node groups in node tree)
                if group_name == "main":
                    nt = nodes
                elif root['__info__']['node_tree_id'] == "ShaderNodeTree":
                    nt = bpy.data.node_groups.new(group_name, "ShaderNodeTree")
                elif root['__info__']['node_tree_id'] == "TextureNodeTree":
                    nt = bpy.data.node_groups.new(group_name, "TextureNodeTree")
                elif root['__info__']['node_tree_id'] == 'SverchCustomTreeType':
                    nt = bpy.data.node_groups.new(group_name, 'SverchGroupTreeType')

                parents = []

                for node in group['nodes']:
                    parent = {}

                    # check if node is custom then make sure it is installed
                    if node["bl_idname"] == "GenericNoteNode" and \
                            ("generic_note" not in bpy.context.user_preferences.addons.keys() and
                             "genericnote" not in bpy.context.user_preferences.addons.keys()):
                        self.report({"WARNING"}, "Generic Note Node Add-on Not Installed")
                    else:
                        # retrieve node name, create node
                        node_id = node['bl_idname']
                        if node_id[0:11] == "SvGroupNode":  # find what the node_groups id is and use it
                            node_id = bpy.data.node_groups[node['monad.name']].cls_bl_idname

                        if group_name == "main":
                            temp = nt.new(node_id)
                        else:
                            temp = nt.nodes.new(node_id)

                        # node specific is first so that groups are set up first
                        nos = node["node_specific"]
                        if nos:
                            for i in range(0, len(nos), 2):  # step by two because name, value, name, value...
                                att = nos[i]
                                val = nos[i + 1]

                                # group node inputs and outputs
                                if att in ("group_input", "group_output"):
                                    for sub in range(0, len(val), 2):
                                        if att == "group_input" and val[sub] != "NodeSocketVirtual":
                                            nt.inputs.new(val[sub], val[sub + 1])
                                        elif att == "group_output" and val[sub] != "NodeSocketVirtual":
                                            nt.outputs.new(val[sub], val[sub + 1])

                                elif att == "parent" and val is not None:  # don't set parent in case not created yet
                                    parent['parent'] = val
                                elif val is not None:
                                    set_attributes(self, temp, val, att)

                        # inputs
                        if node['inputs']:
                            for i in node['inputs']:
                                for val_key in i['values'].keys():
                                    if isinstance(i['values'][val_key], str):
                                        exec("temp.inputs[{}].{} = '{}'".format(i['index'], val_key,
                                                                                i['values'][val_key]))
                                    else:
                                        exec("temp.inputs[{}].{} = {}".format(i['index'], val_key,
                                                                              i['values'][val_key]))

                        # outputs
                        if node['outputs']:
                            for i in node['outputs']:
                                for val_key in i['values'].keys():
                                    if isinstance(i['values'][val_key], str):
                                        exec("temp.outputs[{}].{} = '{}'".format(i['index'], val_key,
                                                                                 i['values'][val_key]))
                                    else:
                                        exec("temp.outputs[{}].{} = {}".format(i['index'], val_key,
                                                                               i['values'][val_key]))

                        # deal with parents
                        if parent:
                            parent['node'] = temp.name
                            parent['location'] = temp.location
                            parents.append(parent)

                # set parents
                for parent in parents:
                    if group_name != "main":
                        nt.nodes[parent['node']].parent = nt.nodes[parent['parent']]
                        nt.nodes[parent['node']].location = parent['location'] + nt.nodes[parent['parent']].location
                    else:
                        nt[parent['node']].parent = nt[parent['parent']]
                        nt[parent['node']].location = parent['location'] + nt[parent['parent']].location

                if group_name == "main":
                    use_nt, use_ln = nt, links
                else:
                    use_nt, use_ln = nt.nodes, nt.links

                for link in group['links']:
                    o = use_nt[link[0]].outputs[link[1]]
                    i = use_nt[link[2]].inputs[link[3]]
                    use_ln.new(o, i)

        # add material to object
        if context.object is not None and context.scene.node_io_is_auto_add:
            if root['__info__']['node_tree_id'] in ('ShaderNodeTree', 'MitsubaShaderNodeTree'):
                context.object.data.materials.append(node_tree)
            elif root['__info__']['node_tree_id'] == "TextureNodeTree" \
                    and context.active_object.active_material is not None:
                context.active_object.active_material.active_texture = node_tree

        self.report({"INFO"}, "NodeIO: Imported {} With {} Nodes".format(root['__info__']['node_tree_name'],
                                                                         root['__info__']['number_of_nodes']))


def set_attributes(self, temp, val, att):
    # determine attribute type, exec() can be used if value gets directly set to attribute
    if att == "image" and val in bpy.data.images:
        temp.image = bpy.data.images[val]
    elif att == 'an_list_size':  # add correct number of inputs for animation node list
        temp.removeElementInputs()
        for i in range(val):
            temp.newInputSocket()
    elif att == "object" and val in bpy.data.objects:
        temp.object = bpy.data.objects[val]
    elif att == "particle_system" and val[0] in bpy.data.objects \
            and val[1] in bpy.data.objects[val[0]].particle_systems:
        temp.particle_system = bpy.data.objects[val[0]].particle_systems[val[1]]
    elif att == "color_ramp.elements":
        e = temp.color_ramp.elements
        if len(val) >= 2:
            e[0].position = val[0][0]
            e[0].color = val[0][1]
            e[1].position = val[1][0]
            e[1].color = val[1][1]
            del val[0:2]
        for el in val:
            e_temp = e.new(el[0])
            e_temp.color = el[1]
    elif att == "node_tree.name" and val in bpy.data.node_groups:
        temp.node_tree = bpy.data.node_groups[val]
    elif att == "material" and val in bpy.data.materials:
        temp.material = bpy.data.materials[val]
    elif att == "mapping":
        if temp.bl_idname == "an_InterpolationFromCurveMappingNode":  # contains ShaderNodeRGBCurve, which has curve
            node = temp.curveNode.mapping
        elif temp.bl_idname == "TextureNodeCurveTime":
            node = temp.curve
        else:
            node = temp.mapping

        # set curves
        node.black_level = val[0]
        node.white_level = val[1]
        node.clip_max_x = float(val[2])
        node.clip_max_y = float(val[3])
        node.clip_min_x = float(val[4])
        node.clip_min_y = float(val[5])
        node.use_clip = True if val[6] == "True" else False

        for i in range(7):
            del val[0]

        # go through each curve
        counter = 0
        for i in val:
            # set first two points
            curves = node.curves
            curves[counter].extend = i[0]
            del i[0]
            curves[counter].points[0].location = i[0][0]
            curves[counter].points[0].handle_type = i[0][1]
            curves[counter].points[1].location = i[1][0]
            curves[counter].points[1].handle_type = i[1][1]
            del i[0:2]
            for i2 in i:
                temp_point = node.curves[counter].points.new(i2[0][0], i2[0][1])
                temp_point.handle_type = i2[1]
            counter += 1
    elif att == "texture" and val in bpy.data.textures:
        temp.texture = bpy.data.textures[val]
    else:
        try:
            if isinstance(val, str):
                exec("temp.{} = '{}'".format(att, val))
            else:
                exec("temp.{} = {}".format(att, val))
        except (AttributeError, TypeError) as e:
            self.report({"WARNING"}, "NodeIO: Error={}, Node Name={}, Node ID={}, Attribute={}, Value={}".
                        format(type(e).__name__, temp.name, temp.bl_idname, att, val))

# PROPERTIES
bpy.types.Scene.node_io_import_export = EnumProperty(name="Import/Export", items=(("1", "Import", ""),
                                                                                  ("2", "Export", "")))
bpy.types.Scene.node_io_export_path = StringProperty(name="Export Path", subtype="DIR_PATH")
bpy.types.Scene.node_io_import_path_file = StringProperty(name="Import Path", subtype="FILE_PATH")
bpy.types.Scene.node_io_import_path_dir = StringProperty(name="Import Path", subtype="DIR_PATH")
bpy.types.Scene.node_io_dependency_save_type = EnumProperty(name="Dependency Paths", items=(("1", "Absolute Paths", ""),
                                                                                            ("2", "Make Paths Relative",
                                                                                             "")),
                                                            default="1")
bpy.types.Scene.node_io_is_auto_add = BoolProperty(name="Add Node Tree To Object?", default=True)
bpy.types.Scene.node_io_import_type = EnumProperty(name="Import Type", items=(("1", "File", "Imports Just Selected " +
                                                                               "File Unless .zip, In Which Case All " +
                                                                               "Files Within .zip Folder Are Imported"),
                                                                              ("2", "Folder",
                                                                               "Imports All Files Within Folder")))
bpy.types.Scene.node_io_is_compress = BoolProperty(name="Compress Folder?")


class NodeIOPanel(bpy.types.Panel):
    bl_idname = "OBJECT_PT_node_io_panel"
    bl_label = "NodeIO Panel"
    bl_space_type = "NODE_EDITOR"
    bl_region_type = "UI"
    
    def draw(self, context):
        layout = self.layout
        layout.prop(context.scene, "node_io_import_export")
        layout.separator()
        
        if context.scene.node_io_import_export == "2":
            layout.prop(context.scene, "node_io_dependency_save_type")
            layout.prop(context.scene, "node_io_is_compress", icon="FILTER")
            layout.separator()
            layout.prop(context.scene, "node_io_export_path")
            layout.separator()
            layout.operator("export.node_io_export", icon="ZOOMOUT")
                  
        else:
            layout.prop(context.scene, "node_io_import_type")
            layout.prop(context.scene, "node_io_is_auto_add", icon="NODETREE")
            layout.separator()

            if context.scene.node_io_import_type == "1":
                layout.prop(context.scene, "node_io_import_path_file")
            else:
                layout.prop(context.scene, "node_io_import_path_dir")
            layout.separator()

            layout.operator("import.node_io_import", icon="ZOOMIN")


class NodeIOExport(bpy.types.Operator):
    bl_idname = "export.node_io_export"
    bl_label = "Export Node Tree"
    
    def execute(self, context):
        export_node_tree(self, context)
        return {"FINISHED"}


class NodeIOImport(bpy.types.Operator):
    bl_idname = "import.node_io_import"
    bl_label = "Import Node Tree"
    
    def execute(self, context):
        import_node_tree(self, context)
        return {"FINISHED"}             


def register():
    bpy.utils.register_module(__name__)


def unregister():
    bpy.utils.unregister_module(__name__)

if __name__ == "__main__":
    register()