mantis/base_definitions.py

#Mantis Nodes Base
import bpy
from bpy.props import (BoolProperty, StringProperty, EnumProperty, CollectionProperty, \
    IntProperty, IntVectorProperty, PointerProperty, BoolVectorProperty)
from . import ops_nodegroup
from bpy.types import NodeTree, Node, PropertyGroup, Operator, UIList, Panel

from .utilities import (prRed, prGreen, prPurple, prWhite,
                              prOrange,
                              wrapRed, wrapGreen, wrapPurple, wrapWhite,
                              wrapOrange,)

from .utilities import get_socket_maps, relink_socket_map, do_relink


def TellClasses():
    #Why use a function to do this? Because I don't need every class to register.
    return [ MantisTree,
             SchemaTree,
             MantisNodeGroup,
             SchemaGroup,
           ]
def error_popup_draw(self, context):
    self.layout.label(text="Error executing tree. See Console.")

class MantisTree(NodeTree):
    '''A custom node tree type that will show up in the editor type list'''
    bl_idname = 'MantisTree'
    bl_label = "Rigging Nodes"
    bl_icon = 'OUTLINER_OB_ARMATURE'
    
    tree_valid:BoolProperty(default=False)
    do_live_update:BoolProperty(default=True) # use this to disable updates for e.g. scripts
    num_links:IntProperty(default=-1)
    filepath:StringProperty(default="", subtype='FILE_PATH')
    is_executing:BoolProperty(default=False)
    is_exporting:BoolProperty(default=False)
    execution_id:StringProperty(default='')
    mantis_version:IntVectorProperty(default=[0,9,2])
    # this prevents the node group from executing on the next depsgraph update
    # because I don't always have control over when the dg update happens.
    prevent_next_exec:BoolProperty(default=False)
    
    parsed_tree={}

    if bpy.app.version >= (3, 2):  # in 3.1 this can lead to a crash
        @classmethod
        def valid_socket_type(cls, socket_type: str):
            # https://docs.blender.org/api/master/bpy.types.NodeTree.html#bpy.types.NodeTree.valid_socket_type
            from .socket_definitions import Tell_bl_idnames
            return socket_type in Tell_bl_idnames()
            # thank you, Sverchok
            
    def update_tree(self, context = None):
        if self.is_exporting:
            return
        # return
        self.is_executing = True
        from . import readtree
        prGreen("Validating Tree: %s" % self.name)
        try:
            self.parsed_tree = readtree.parse_tree(self)
            if context:
                self.display_update(context)
            self.is_executing = False
            self.tree_valid = True
        except GraphError as e:
            prRed("Failed to update node tree due to error.")
            self.tree_valid = False
            self.is_executing = False
            raise e
        finally:
            self.is_executing = False

    
    def display_update(self, context):
        if self.is_exporting:
            return
        self.is_executing = True
        current_tree = bpy.context.space_data.path[-1].node_tree
        for node in current_tree.nodes:
            if hasattr(node, "display_update"):
                try:
                    node.display_update(self.parsed_tree, context)
                except Exception as e:
                    print("Node \"%s\" failed to update display with error: %s" %(wrapGreen(node.name), wrapRed(e)))
        self.is_executing = False
        
        # TODO: deal with invalid links properly.
        #    - Non-hierarchy links should be ignored in the circle-check and so the links should be marked valid in such a circle
        #    - hierarchy-links should be marked invalid and prevent the tree from executing.

        
    
    def execute_tree(self,context, error_popups = False):
        self.prevent_next_exec = False
        if self.is_exporting:
            return
        # return
        prGreen("Executing Tree: %s" % self.name)
        self.is_executing = True
        from . import readtree
        try:
            readtree.execute_tree(self.parsed_tree, self, context, error_popups)
        except RecursionError as e:
            prRed("Recursion error while parsing tree.")
        finally:
            self.is_executing = False


class SchemaTree(NodeTree):
    '''A node tree representing a schema to generate a Mantis tree'''
    bl_idname = 'SchemaTree'
    bl_label = "Rigging Nodes Schema"
    bl_icon = 'RIGID_BODY_CONSTRAINT'

    # these are only needed for consistent interface, but should not be used
    do_live_update:BoolProperty(default=True) # default to true so that updates work
    is_executing:BoolProperty(default=False)
    is_exporting:BoolProperty(default=False)

    mantis_version:IntVectorProperty(default=[0,9,2])

    if bpy.app.version >= (3, 2):  # in 3.1 this can lead to a crash
        @classmethod
        def valid_socket_type(cls, socket_type: str):
            # https://docs.blender.org/api/master/bpy.types.NodeTree.html#bpy.types.NodeTree.valid_socket_type
            from .socket_definitions import Tell_bl_idnames
            return socket_type in Tell_bl_idnames()
            # thank you, Sverchok
            


#TODO: do a better job explaining how the following two classes relate.

class MantisNode:
    """
        This class contains the basic interface for a Mantis Node.
        A MantisNode is used internally by Mantis to represent the final evaluated node graph.
        It gets generated with data from a MantisUINode when the graph is read.
    """
    def flush_links(self):
        for inp in self.inputs.values():
            inp.flush_links()
        for out in self.outputs.values():
            out.flush_links()
    
    def evaluate_input(self, input_name, index=0):
        from .node_container_common import trace_single_line
        if not (self.inputs.get(input_name)): # get the named parameter if there is no input
            if input_name == 'Meta-Armature':
                prOrange("beans are not frogs")
            return self.parameters.get(input_name) # this will return None if the parameter does not exist.
        # this trace() should give a key error if there is a problem
        #  it is NOT handled here because it should NOT happen - so I want the error message.
        trace = trace_single_line(self, input_name, index)
        prop = trace[0][-1].parameters[trace[1].name] #trace[0] = the list of traced nodes; read its parameters
        return prop
    
    def fill_parameters(self, ui_node=None):
        from .utilities import get_node_prototype
        from .node_container_common import get_socket_value
        if not ui_node:
            if ( (self.signature[0] in  ["MANTIS_AUTOGENERATED", "SCHEMA_AUTOGENERATED" ]) or 
                (self.signature[-1] in ["NodeGroupOutput", "NodeGroupInput"]) ): # I think this is harmless
                return None
            else:
                ui_node = get_node_prototype(self.signature, self.base_tree)
            if not ui_node:
                raise RuntimeError(wrapRed("No node prototype found for... %s" % ( [self.base_tree] + list(self.signature[1:]) ) ) )
        for key in self.parameters.keys():
            node_socket = ui_node.inputs.get(key)
            if self.parameters[key] is not None: # the parameters are usually initialized as None.
                continue # will be filled by the node itself
            if not node_socket: #maybe the node socket has no name
                if ( ( len(ui_node.inputs) == 0) and ( len(ui_node.outputs) == 1) ):
                    # this is a simple input node.
                    node_socket = ui_node.outputs[0]
                elif key == 'Name': # for Links we just use the Node Label, or if there is no label, the name.
                    self.parameters[key] = ui_node.label if ui_node.label else ui_node.name
                    continue
                else:
                    pass
            if node_socket:
                if node_socket.bl_idname in  ['RelationshipSocket', 'xFormSocket']:
                    continue
                elif node_socket.is_linked and (not node_socket.is_output):
                    pass # we will get the value from the link, because this is a linked input port.
                # very importantly, we do not pass linked outputs- fill these because they are probably Input nodes.
                elif hasattr(node_socket, "default_value"):
                    if (value := get_socket_value(node_socket)) is not None:
                        self.parameters[key] = value
                        # TODO: try and remove the input if it is not needed (for performance speed)
                    else:
                        raise RuntimeError(wrapRed("No value found for " + self.__repr__() + " when filling out node parameters for " + ui_node.name + "::"+node_socket.name))
                else:
                    pass
    
    def bPrepare(self, bContext=None):
        return
    def bExecute(self, bContext=None):
        return
    def bFinalize(self, bContext=None):
        return
    def __repr__(self): 
        return self.signature.__repr__()


class MantisUINode:
    """
        This class contains the common user-interface features of Mantis nodes.
        MantisUINode objects will spawn one or more MantisNode objects when the graph is evaluated.
        The MantisNode objects will pull the data from the UI node and use it to generate the graph.
    """
    @classmethod
    def poll(cls, ntree):
        return (ntree.bl_idname in ['MantisTree', 'SchemaTree'])
                
    def insert_link(self, link):
        context = bpy.context
        if context.space_data:
            node_tree = context.space_data.path[0].node_tree
            from . import readtree
            if node_tree.do_live_update:
                node_tree.update_tree(context)
                if (link.to_socket.is_linked == False):
                    node_tree.num_links+=1
                elif (link.to_socket.is_multi_input):
                    node_tree.num_links+=1
        
            
class SchemaUINode:
    @classmethod
    def poll(cls, ntree):
        return (ntree.bl_idname in ['SchemaTree'])

class LinkNode(MantisUINode):
    @classmethod
    def poll(cls, ntree):
        return (ntree.bl_idname in ['MantisTree', 'SchemaTree'])

class xFormNode(MantisUINode):
    @classmethod
    def poll(cls, ntree):
        return (ntree.bl_idname in ['MantisTree', 'SchemaTree'])

class DeformerNode(MantisUINode):
    @classmethod
    def poll(cls, ntree):
        return (ntree.bl_idname in ['MantisTree', 'SchemaTree'])


def poll_node_tree(self, object):
    if isinstance(object, MantisTree):
        return True
    return False

# TODO: try to check identifiers instead of name.
def node_group_update(node, force = False):
    if not force:
        if (node.id_data.do_live_update == False) or (node.id_data.is_executing == True):
            return
    # note: if (node.id_data.is_exporting == True) I need to be able to update so I can make links.
    toggle_update = node.id_data.do_live_update
    node.id_data.do_live_update = False

    identifiers_in={socket.identifier:socket for socket in node.inputs}
    identifiers_out={socket.identifier:socket for socket in node.outputs}

    if node.node_tree is None:
        node.inputs.clear(); node.outputs.clear()
        node.id_data.do_live_update = toggle_update
        return
    found_in, found_out = [], []
    update_input, update_output = False, False
    for item in node.node_tree.interface.items_tree:
        if item.item_type != "SOCKET": continue
        if item.in_out == 'OUTPUT':
            if s:= identifiers_out.get(item.identifier): # if the requested output doesn't exist, update
                found_out.append(item.identifier)
                if update_output: continue
                if s.bl_idname != item.socket_type: update_output = True; continue
            else: update_output = True; continue
        else:
            if s:= identifiers_in.get(item.identifier): # if the requested input doesn't exist, update
                found_in.append(item.identifier)
                if update_input: continue # done here
                if s.bl_idname != item.socket_type: update_input = True; continue
            else: update_input = True; continue
    
    # Schema has an extra input for Length and for Extend.
    if node.bl_idname == 'MantisSchemaGroup':
        found_in.extend(['Schema Length', ''])

    # if we have too many elements, just get rid of the ones we don't need
    if len(node.inputs) > len(found_in):#
        for inp in node.inputs:
            if inp.identifier in found_in: continue
            node.inputs.remove(inp)
    if len(node.outputs) > len(found_out):
        for out in node.outputs:
            if out.identifier in found_out: continue
            node.outputs.remove(out)
    #
    if len(node.inputs) > 0 and (inp := node.inputs[-1]).bl_idname == 'WildcardSocket' and inp.is_linked:
        update_input = True
    if len(node.outputs) > 0 and  (out := node.outputs[-1]).bl_idname == 'WildcardSocket' and out.is_linked:
        update_output = True
    #
    if not (update_input or update_output):
        node.id_data.do_live_update = toggle_update
        return

    if update_input or update_output:
        socket_map_in, socket_map_out = get_socket_maps(node)

        if update_input :
            if node.bl_idname == 'MantisSchemaGroup':
                schema_length=0
                if sl := node.inputs.get("Schema Length"):
                    schema_length = sl.default_value
                # sometimes this isn't available yet # TODO not happy about this solution

            node.inputs.clear()
            if node.bl_idname == 'MantisSchemaGroup':
                node.inputs.new("IntSocket", "Schema Length", identifier='Schema Length')
                node.inputs['Schema Length'].default_value = schema_length

        if update_output: node.outputs.clear()


        for item in node.node_tree.interface.items_tree:
            if item.item_type != "SOCKET": continue
            if (item.in_out == 'INPUT' and update_input):
                relink_socket_map(node, node.inputs, socket_map_in, item)
            if (item.in_out == 'OUTPUT' and update_output):
                relink_socket_map(node, node.outputs, socket_map_out, item)
        
        # at this point there is no wildcard socket
        if '__extend__' in socket_map_in.keys():
            do_relink(node, None, socket_map_in, in_out='INPUT', parent_name='Constant' )



        node.id_data.do_live_update = toggle_update




def node_tree_prop_update(self, context):
    if self.is_updating: # update() can be called from update() and that leads to an infinite loop.
        return           # so we check if an update is currently running.
    self.is_updating = True
    node_group_update(self)
    self.is_updating = False
    if self.bl_idname in ['MantisSchemaGroup'] and self.node_tree is not None:
        if len(self.inputs) == 0:
            self.inputs.new("IntSocket", "Schema Length", identifier='Schema Length')
        if self.inputs[-1].bl_idname != "WildcardSocket":
            self.inputs.new("WildcardSocket", "", identifier="__extend__")

from bpy.types import NodeCustomGroup

class MantisNodeGroup(Node, MantisUINode):
    bl_idname = "MantisNodeGroup"
    bl_label = "Node Group"

    node_tree:PointerProperty(type=NodeTree, poll=poll_node_tree, update=node_tree_prop_update,)
    is_updating:BoolProperty(default=False)
    
    def update(self):
        live_update = self.id_data.do_live_update
        if self.is_updating: # update() can be called from update() and that leads to an infinite loop.
            return           # so we check if an update is currently running.
        try:
            self.is_updating = True
            node_group_update(self)
            self.is_updating = False
        finally: # we need to reset this regardless of whether or not the operation succeeds!
            self.is_updating = False
            self.id_data.do_live_update = live_update # ensure this remains the same

    def draw_buttons(self, context, layout):
        row = layout.row(align=True)
        row.prop(self, "node_tree", text="")
        row.operator("mantis.edit_group", text="", icon='NODETREE', emboss=True)
        

class GraphError(Exception):
    pass

def get_signature_from_edited_tree(node, context):
    sig_path=[None,]
    for item in context.space_data.path[:-1]:
        sig_path.append(item.node_tree.nodes.active.name)
    return tuple(sig_path+[node.name])

def poll_node_tree_schema(self, object):
    if isinstance(object, SchemaTree):
        return True
    return False


# TODO tiny UI problem - inserting new links into the tree will not place them in the right place.

class SchemaGroup(Node, MantisUINode):
    bl_idname = "MantisSchemaGroup"
    bl_label = "Node Schema"
    
    node_tree:PointerProperty(type=NodeTree, poll=poll_node_tree_schema, update=node_tree_prop_update,)
    is_updating:BoolProperty(default=False)

    def draw_buttons(self, context, layout):
        row = layout.row(align=True)
        row.prop(self, "node_tree", text="")
        row.operator("mantis.edit_group", text="", icon='NODETREE', emboss=True)

    def update(self):
        live_update = self.id_data.do_live_update
        if self.is_updating: # update() can be called from update() and that leads to an infinite loop.
            return           # so we check if an update is currently running.
        self.is_updating = True
        try:
            node_group_update(self)
            # reset things if necessary:
            if self.node_tree:
                if len(self.inputs) == 0:
                    self.inputs.new("IntSocket", "Schema Length", identifier='Schema Length')
                if self.inputs[-1].bl_idname != "WildcardSocket":
                    self.inputs.new("WildcardSocket", "", identifier="__extend__")
        finally: # we need to reset this regardless of whether or not the operation succeeds!
            self.is_updating = False
            self.id_data.do_live_update = live_update # ensure this remains the same



NODES_REMOVED=["xFormRootNode"]
                 # Node bl_idname, # Socket Name
SOCKETS_REMOVED=[("UtilityDriverVariable", "Transform Channel"),
                 ("xFormRootNode","World Out"),
                 ("UtilitySwitch","xForm"),
                 ("LinkDrivenParameter", "Enable")]
                  # Node Class           #Prior bl_idname  # prior name # new bl_idname # new name, # Multi
SOCKETS_RENAMED=[ ("LinkDrivenParameter", "DriverSocket",   "Driver",     "FloatSocket",  "Value",  False)]

                # NODE CLASS NAME             IN_OUT    SOCKET TYPE     SOCKET NAME     INDEX   MULTI     DEFAULT
SOCKETS_ADDED=[("DeformerMorphTargetDeform", 'INPUT', 'BooleanSocket', "Use Shape Key", 1,      False,    False),
               ("DeformerMorphTargetDeform", 'INPUT', 'BooleanSocket', "Use Offset", 2,         False,     True),
               ("UtilityFCurve",             'INPUT',  "eFCrvExtrapolationMode", "Extrapolation Mode", 0, False, 'CONSTANT')]

# replace names with bl_idnames for reading the tree and solving schemas.
replace_types = ["NodeGroupInput", "NodeGroupOutput", "SchemaIncomingConnection",
                 "SchemaArrayInput", "SchemaConstInput", "SchemaConstOutput", "SchemaIndex",
                 "SchemaOutgoingConnection", "SchemaConstantOutput", "SchemaArrayOutput",
                 "SchemaArrayInputGet",]

# anything that gets properties added in the graph... this is a clumsy approach but I need to watch for this
#   in schema generation and this is the easiest way to do it for now.
custom_props_types = ["LinkArmature", "UtilityKeyframe", "UtilityFCurve", "UtilityDriver", "xFormBone"]

# filters for determining if a link is a hierarchy link or a non-hierarchy (cyclic) link.
from_name_filter = ["Driver",]
to_name_filter = [
                   "Custom Object xForm Override",
                   "Custom Object",
                   "Deform Bones",
                 ]