From 6201f5ebe3117668452aab956ac14411b7467a51 Mon Sep 17 00:00:00 2001
From: Dan Ash <danash001@gmail.com>
Date: Sun, 23 Jul 2023 23:39:15 +0300
Subject: [PATCH] split classes into files

create a context abstract class

Node as Cluster

Adding documentation

Revert node as cluster

Fix multiple out format implementation & test

CR Changes

Group=Cluster
---
 diagrams/__init__.py  | 559 +--------------------------------------
 diagrams/cluster.py   |  74 ++++++
 diagrams/context.py   |  27 ++
 diagrams/diagram.py   | 149 +++++++++++
 diagrams/edge.py      | 119 +++++++++
 diagrams/node.py      | 158 +++++++++++
 diagrams/utils.py     |  31 +++
 poetry.lock           | 593 +++++++++++++++++++++++-------------------
 pyproject.toml        |   2 +
 tests/test_diagram.py |  10 +-
 10 files changed, 902 insertions(+), 820 deletions(-)
 create mode 100644 diagrams/cluster.py
 create mode 100644 diagrams/context.py
 create mode 100644 diagrams/diagram.py
 create mode 100644 diagrams/edge.py
 create mode 100644 diagrams/node.py
 create mode 100644 diagrams/utils.py

diff --git a/diagrams/__init__.py b/diagrams/__init__.py
index 6fe2a8024..1ade79536 100644
--- a/diagrams/__init__.py
+++ b/diagrams/__init__.py
@@ -1,555 +1,6 @@
-import contextvars
-import os
-import uuid
-from pathlib import Path
-from typing import Dict, List, Optional, Union
-
-from graphviz import Digraph
-
-# Global contexts for a diagrams and a cluster.
-#
-# These global contexts are for letting the clusters and nodes know
-# where context they are belong to. So the all clusters and nodes does
-# not need to specify the current diagrams or cluster via parameters.
-__diagram = contextvars.ContextVar("diagrams")
-__cluster = contextvars.ContextVar("cluster")
-
-
-def getdiagram() -> "Diagram":
-    try:
-        return __diagram.get()
-    except LookupError:
-        return None
-
-
-def setdiagram(diagram: "Diagram"):
-    __diagram.set(diagram)
-
-
-def getcluster() -> "Cluster":
-    try:
-        return __cluster.get()
-    except LookupError:
-        return None
-
-
-def setcluster(cluster: "Cluster"):
-    __cluster.set(cluster)
-
-
-class Diagram:
-    __directions = ("TB", "BT", "LR", "RL")
-    __curvestyles = ("ortho", "curved")
-    __outformats = ("png", "jpg", "svg", "pdf", "dot")
-
-    # fmt: off
-    _default_graph_attrs = {
-        "pad": "2.0",
-        "splines": "ortho",
-        "nodesep": "0.60",
-        "ranksep": "0.75",
-        "fontname": "Sans-Serif",
-        "fontsize": "15",
-        "fontcolor": "#2D3436",
-    }
-    _default_node_attrs = {
-        "shape": "box",
-        "style": "rounded",
-        "fixedsize": "true",
-        "width": "1.4",
-        "height": "1.4",
-        "labelloc": "b",
-        # imagepos attribute is not backward compatible
-        # TODO: check graphviz version to see if "imagepos" is available >= 2.40
-        # https://github.com/xflr6/graphviz/blob/master/graphviz/backend.py#L248
-        # "imagepos": "tc",
-        "imagescale": "true",
-        "fontname": "Sans-Serif",
-        "fontsize": "13",
-        "fontcolor": "#2D3436",
-    }
-    _default_edge_attrs = {
-        "color": "#7B8894",
-    }
-
-    # fmt: on
-
-    # TODO: Label position option
-    # TODO: Save directory option (filename + directory?)
-    def __init__(
-        self,
-        name: str = "",
-        filename: str = "",
-        direction: str = "LR",
-        curvestyle: str = "ortho",
-        outformat: str = "png",
-        autolabel: bool = False,
-        show: bool = True,
-        strict: bool = False,
-        graph_attr: Optional[dict] = None,
-        node_attr: Optional[dict] = None,
-        edge_attr: Optional[dict] = None,
-    ):
-        """Diagram represents a global diagrams context.
-
-        :param name: Diagram name. It will be used for output filename if the
-            filename isn't given.
-        :param filename: The output filename, without the extension (.png).
-            If not given, it will be generated from the name.
-        :param direction: Data flow direction. Default is 'left to right'.
-        :param curvestyle: Curve bending style. One of "ortho" or "curved".
-        :param outformat: Output file format. Default is 'png'.
-        :param show: Open generated image after save if true, just only save otherwise.
-        :param graph_attr: Provide graph_attr dot config attributes.
-        :param node_attr: Provide node_attr dot config attributes.
-        :param edge_attr: Provide edge_attr dot config attributes.
-        :param strict: Rendering should merge multi-edges.
-        """
-        if graph_attr is None:
-            graph_attr = {}
-        if node_attr is None:
-            node_attr = {}
-        if edge_attr is None:
-            edge_attr = {}
-        self.name = name
-        if not name and not filename:
-            filename = "diagrams_image"
-        elif not filename:
-            filename = "_".join(self.name.split()).lower()
-        self.filename = filename
-        self.dot = Digraph(self.name, filename=self.filename, strict=strict)
-
-        # Set attributes.
-        for k, v in self._default_graph_attrs.items():
-            self.dot.graph_attr[k] = v
-        self.dot.graph_attr["label"] = self.name
-        for k, v in self._default_node_attrs.items():
-            self.dot.node_attr[k] = v
-        for k, v in self._default_edge_attrs.items():
-            self.dot.edge_attr[k] = v
-
-        if not self._validate_direction(direction):
-            raise ValueError(f'"{direction}" is not a valid direction')
-        self.dot.graph_attr["rankdir"] = direction
-
-        if not self._validate_curvestyle(curvestyle):
-            raise ValueError(f'"{curvestyle}" is not a valid curvestyle')
-        self.dot.graph_attr["splines"] = curvestyle
-
-        if isinstance(outformat, list):
-            for one_format in outformat:
-                if not self._validate_outformat(one_format):
-                    raise ValueError(f'"{one_format}" is not a valid output format')
-        else:
-            if not self._validate_outformat(outformat):
-                raise ValueError(f'"{outformat}" is not a valid output format')
-        self.outformat = outformat
-
-        # Merge passed in attributes
-        self.dot.graph_attr.update(graph_attr)
-        self.dot.node_attr.update(node_attr)
-        self.dot.edge_attr.update(edge_attr)
-
-        self.show = show
-        self.autolabel = autolabel
-
-    def __str__(self) -> str:
-        return str(self.dot)
-
-    def __enter__(self):
-        setdiagram(self)
-        return self
-
-    def __exit__(self, exc_type, exc_value, traceback):
-        self.render()
-        # Remove the graphviz file leaving only the image.
-        os.remove(self.filename)
-        setdiagram(None)
-
-    def _repr_png_(self):
-        return self.dot.pipe(format="png")
-
-    def _validate_direction(self, direction: str) -> bool:
-        return direction.upper() in self.__directions
-
-    def _validate_curvestyle(self, curvestyle: str) -> bool:
-        return curvestyle.lower() in self.__curvestyles
-
-    def _validate_outformat(self, outformat: str) -> bool:
-        return outformat.lower() in self.__outformats
-
-    def node(self, nodeid: str, label: str, **attrs) -> None:
-        """Create a new node."""
-        self.dot.node(nodeid, label=label, **attrs)
-
-    def connect(self, node: "Node", node2: "Node", edge: "Edge") -> None:
-        """Connect the two Nodes."""
-        self.dot.edge(node.nodeid, node2.nodeid, **edge.attrs)
-
-    def subgraph(self, dot: Digraph) -> None:
-        """Create a subgraph for clustering"""
-        self.dot.subgraph(dot)
-
-    def render(self) -> None:
-        if isinstance(self.outformat, list):
-            for one_format in self.outformat:
-                self.dot.render(format=one_format, view=self.show, quiet=True)
-        else:
-            self.dot.render(format=self.outformat, view=self.show, quiet=True)
-
-
-class Cluster:
-    __directions = ("TB", "BT", "LR", "RL")
-    __bgcolors = ("#E5F5FD", "#EBF3E7", "#ECE8F6", "#FDF7E3")
-
-    # fmt: off
-    _default_graph_attrs = {
-        "shape": "box",
-        "style": "rounded",
-        "labeljust": "l",
-        "pencolor": "#AEB6BE",
-        "fontname": "Sans-Serif",
-        "fontsize": "12",
-    }
-
-    # fmt: on
-
-    # FIXME:
-    #  Cluster direction does not work now. Graphviz couldn't render
-    #  correctly for a subgraph that has a different rank direction.
-    def __init__(
-        self,
-        label: str = "cluster",
-        direction: str = "LR",
-        graph_attr: Optional[dict] = None,
-    ):
-        """Cluster represents a cluster context.
-
-        :param label: Cluster label.
-        :param direction: Data flow direction. Default is 'left to right'.
-        :param graph_attr: Provide graph_attr dot config attributes.
-        """
-        if graph_attr is None:
-            graph_attr = {}
-        self.label = label
-        self.name = "cluster_" + self.label
-
-        self.dot = Digraph(self.name)
-
-        # Set attributes.
-        for k, v in self._default_graph_attrs.items():
-            self.dot.graph_attr[k] = v
-        self.dot.graph_attr["label"] = self.label
-
-        if not self._validate_direction(direction):
-            raise ValueError(f'"{direction}" is not a valid direction')
-        self.dot.graph_attr["rankdir"] = direction
-
-        # Node must be belong to a diagrams.
-        self._diagram = getdiagram()
-        if self._diagram is None:
-            raise EnvironmentError("Global diagrams context not set up")
-        self._parent = getcluster()
-
-        # Set cluster depth for distinguishing the background color
-        self.depth = self._parent.depth + 1 if self._parent else 0
-        coloridx = self.depth % len(self.__bgcolors)
-        self.dot.graph_attr["bgcolor"] = self.__bgcolors[coloridx]
-
-        # Merge passed in attributes
-        self.dot.graph_attr.update(graph_attr)
-
-    def __enter__(self):
-        setcluster(self)
-        return self
-
-    def __exit__(self, exc_type, exc_value, traceback):
-        if self._parent:
-            self._parent.subgraph(self.dot)
-        else:
-            self._diagram.subgraph(self.dot)
-        setcluster(self._parent)
-
-    def _validate_direction(self, direction: str) -> bool:
-        return direction.upper() in self.__directions
-
-    def node(self, nodeid: str, label: str, **attrs) -> None:
-        """Create a new node in the cluster."""
-        self.dot.node(nodeid, label=label, **attrs)
-
-    def subgraph(self, dot: Digraph) -> None:
-        self.dot.subgraph(dot)
-
-
-class Node:
-    """Node represents a node for a specific backend service."""
-
-    _provider = None
-    _type = None
-
-    _icon_dir = None
-    _icon = None
-
-    _height = 1.9
-
-    def __init__(self, label: str = "", *, nodeid: str = None, **attrs: Dict):
-        """Node represents a system component.
-
-        :param label: Node label.
-        """
-        # Generates an ID for identifying a node, unless specified
-        self._id = nodeid or self._rand_id()
-        self.label = label
-
-        # Node must be belong to a diagrams.
-        self._diagram = getdiagram()
-        if self._diagram is None:
-            raise EnvironmentError("Global diagrams context not set up")
-
-        if self._diagram.autolabel:
-            prefix = self.__class__.__name__
-            if self.label:
-                self.label = prefix + "\n" + self.label
-            else:
-                self.label = prefix
-
-        # fmt: off
-        # If a node has an icon, increase the height slightly to avoid
-        # that label being spanned between icon image and white space.
-        # Increase the height by the number of new lines included in the label.
-        padding = 0.4 * (self.label.count('\n'))
-        self._attrs = {
-            "shape": "none",
-            "height": str(self._height + padding),
-            "image": self._load_icon(),
-        } if self._icon else {}
-
-        # fmt: on
-        self._attrs.update(attrs)
-
-        self._cluster = getcluster()
-
-        # If a node is in the cluster context, add it to cluster.
-        if self._cluster:
-            self._cluster.node(self._id, self.label, **self._attrs)
-        else:
-            self._diagram.node(self._id, self.label, **self._attrs)
-
-    def __repr__(self):
-        _name = self.__class__.__name__
-        return f"<{self._provider}.{self._type}.{_name}>"
-
-    def __sub__(self, other: Union["Node", List["Node"], "Edge"]):
-        """Implement Self - Node, Self - [Nodes] and Self - Edge."""
-        if isinstance(other, list):
-            for node in other:
-                self.connect(node, Edge(self))
-            return other
-        elif isinstance(other, Node):
-            return self.connect(other, Edge(self))
-        else:
-            other.node = self
-            return other
-
-    def __rsub__(self, other: Union[List["Node"], List["Edge"]]):
-        """Called for [Nodes] and [Edges] - Self because list don't have __sub__ operators."""
-        for o in other:
-            if isinstance(o, Edge):
-                o.connect(self)
-            else:
-                o.connect(self, Edge(self))
-        return self
-
-    def __rshift__(self, other: Union["Node", List["Node"], "Edge"]):
-        """Implements Self >> Node, Self >> [Nodes] and Self Edge."""
-        if isinstance(other, list):
-            for node in other:
-                self.connect(node, Edge(self, forward=True))
-            return other
-        elif isinstance(other, Node):
-            return self.connect(other, Edge(self, forward=True))
-        else:
-            other.forward = True
-            other.node = self
-            return other
-
-    def __lshift__(self, other: Union["Node", List["Node"], "Edge"]):
-        """Implements Self << Node, Self << [Nodes] and Self << Edge."""
-        if isinstance(other, list):
-            for node in other:
-                self.connect(node, Edge(self, reverse=True))
-            return other
-        elif isinstance(other, Node):
-            return self.connect(other, Edge(self, reverse=True))
-        else:
-            other.reverse = True
-            return other.connect(self)
-
-    def __rrshift__(self, other: Union[List["Node"], List["Edge"]]):
-        """Called for [Nodes] and [Edges] >> Self because list don't have __rshift__ operators."""
-        for o in other:
-            if isinstance(o, Edge):
-                o.forward = True
-                o.connect(self)
-            else:
-                o.connect(self, Edge(self, forward=True))
-        return self
-
-    def __rlshift__(self, other: Union[List["Node"], List["Edge"]]):
-        """Called for [Nodes] << Self because list of Nodes don't have __lshift__ operators."""
-        for o in other:
-            if isinstance(o, Edge):
-                o.reverse = True
-                o.connect(self)
-            else:
-                o.connect(self, Edge(self, reverse=True))
-        return self
-
-    @property
-    def nodeid(self):
-        return self._id
-
-    # TODO: option for adding flow description to the connection edge
-    def connect(self, node: "Node", edge: "Edge"):
-        """Connect to other node.
-
-        :param node: Other node instance.
-        :param edge: Type of the edge.
-        :return: Connected node.
-        """
-        if not isinstance(node, Node):
-            ValueError(f"{node} is not a valid Node")
-        if not isinstance(edge, Edge):
-            ValueError(f"{edge} is not a valid Edge")
-        # An edge must be added on the global diagrams, not a cluster.
-        self._diagram.connect(self, node, edge)
-        return node
-
-    @staticmethod
-    def _rand_id():
-        return uuid.uuid4().hex
-
-    def _load_icon(self):
-        basedir = Path(os.path.abspath(os.path.dirname(__file__)))
-        return os.path.join(basedir.parent, self._icon_dir, self._icon)
-
-
-class Edge:
-    """Edge represents an edge between two nodes."""
-
-    _default_edge_attrs = {
-        "fontcolor": "#2D3436",
-        "fontname": "Sans-Serif",
-        "fontsize": "13",
-    }
-
-    def __init__(
-        self,
-        node: "Node" = None,
-        forward: bool = False,
-        reverse: bool = False,
-        label: str = "",
-        color: str = "",
-        style: str = "",
-        **attrs: Dict,
-    ):
-        """Edge represents an edge between two nodes.
-
-        :param node: Parent node.
-        :param forward: Points forward.
-        :param reverse: Points backward.
-        :param label: Edge label.
-        :param color: Edge color.
-        :param style: Edge style.
-        :param attrs: Other edge attributes
-        """
-        if node is not None:
-            assert isinstance(node, Node)
-
-        self.node = node
-        self.forward = forward
-        self.reverse = reverse
-
-        self._attrs = {}
-
-        # Set attributes.
-        for k, v in self._default_edge_attrs.items():
-            self._attrs[k] = v
-
-        if label:
-            # Graphviz complaining about using label for edges, so replace it with xlabel.
-            # Update: xlabel option causes the misaligned label position: https://github.com/mingrammer/diagrams/issues/83
-            self._attrs["label"] = label
-        if color:
-            self._attrs["color"] = color
-        if style:
-            self._attrs["style"] = style
-        self._attrs.update(attrs)
-
-    def __sub__(self, other: Union["Node", "Edge", List["Node"]]):
-        """Implement Self - Node or Edge and Self - [Nodes]"""
-        return self.connect(other)
-
-    def __rsub__(self, other: Union[List["Node"], List["Edge"]]) -> List["Edge"]:
-        """Called for [Nodes] or [Edges] - Self because list don't have __sub__ operators."""
-        return self.append(other)
-
-    def __rshift__(self, other: Union["Node", "Edge", List["Node"]]):
-        """Implements Self >> Node or Edge and Self >> [Nodes]."""
-        self.forward = True
-        return self.connect(other)
-
-    def __lshift__(self, other: Union["Node", "Edge", List["Node"]]):
-        """Implements Self << Node or Edge and Self << [Nodes]."""
-        self.reverse = True
-        return self.connect(other)
-
-    def __rrshift__(self, other: Union[List["Node"], List["Edge"]]) -> List["Edge"]:
-        """Called for [Nodes] or [Edges] >> Self because list of Edges don't have __rshift__ operators."""
-        return self.append(other, forward=True)
-
-    def __rlshift__(self, other: Union[List["Node"], List["Edge"]]) -> List["Edge"]:
-        """Called for [Nodes] or [Edges] << Self because list of Edges don't have __lshift__ operators."""
-        return self.append(other, reverse=True)
-
-    def append(self, other: Union[List["Node"], List["Edge"]], forward=None, reverse=None) -> List["Edge"]:
-        result = []
-        for o in other:
-            if isinstance(o, Edge):
-                o.forward = forward if forward else o.forward
-                o.reverse = forward if forward else o.reverse
-                self._attrs = o.attrs.copy()
-                result.append(o)
-            else:
-                result.append(Edge(o, forward=forward, reverse=reverse, **self._attrs))
-        return result
-
-    def connect(self, other: Union["Node", "Edge", List["Node"]]):
-        if isinstance(other, list):
-            for node in other:
-                self.node.connect(node, self)
-            return other
-        elif isinstance(other, Edge):
-            self._attrs = other._attrs.copy()
-            return self
-        else:
-            if self.node is not None:
-                return self.node.connect(other, self)
-            else:
-                self.node = other
-                return self
-
-    @property
-    def attrs(self) -> Dict:
-        if self.forward and self.reverse:
-            direction = "both"
-        elif self.forward:
-            direction = "forward"
-        elif self.reverse:
-            direction = "back"
-        else:
-            direction = "none"
-        return {**self._attrs, "dir": direction}
-
-
+from .diagram import Diagram
+from .cluster import Cluster
+from .node import Node
+from .edge import Edge
+from .utils import getdiagram, setdiagram, getcluster, setcluster
 Group = Cluster
diff --git a/diagrams/cluster.py b/diagrams/cluster.py
new file mode 100644
index 000000000..e9fd6241a
--- /dev/null
+++ b/diagrams/cluster.py
@@ -0,0 +1,74 @@
+from graphviz import Digraph
+from typing import Optional
+from .context import Context
+from .utils import setcluster, getcluster, getdiagram
+
+class Cluster(Context):
+    __bgcolors = ("#E5F5FD", "#EBF3E7", "#ECE8F6", "#FDF7E3")
+
+    # fmt: off
+    _default_graph_attrs = {
+        "shape": "box",
+        "style": "rounded",
+        "labeljust": "l",
+        "pencolor": "#AEB6BE",
+        "fontname": "Sans-Serif",
+        "fontsize": "12",
+    }
+
+    # fmt: on
+
+    # FIXME:
+    #  Cluster direction does not work now. Graphviz couldn't render
+    #  correctly for a subgraph that has a different rank direction.
+    def __init__(
+        self,
+        label: str = "cluster",
+        direction: str = "LR",
+        graph_attr: Optional[dict] = None,
+    ):
+        """Cluster represents a cluster context.
+
+        :param label: Cluster label.
+        :param direction: Data flow direction. Default is 'left to right'.
+        :param graph_attr: Provide graph_attr dot config attributes.
+        """
+        if graph_attr is None:
+            graph_attr = {}
+        self.label = label
+        super().__init__("cluster_" + self.label)
+
+        # Set attributes.
+        for k, v in self._default_graph_attrs.items():
+            self.dot.graph_attr[k] = v
+        self.dot.graph_attr["label"] = self.label
+
+        if not self._validate_direction(direction):
+            raise ValueError(f'"{direction}" is not a valid direction')
+        self.dot.graph_attr["rankdir"] = direction
+
+        # Node must be belong to a diagrams.
+        self._diagram = getdiagram()
+        if self._diagram is None:
+            raise EnvironmentError("Global diagrams context not set up")
+        self._parent = getcluster()
+
+        # Set cluster depth for distinguishing the background color
+        self.depth = self._parent.depth + 1 if self._parent else 0
+        coloridx = self.depth % len(self.__bgcolors)
+        self.dot.graph_attr["bgcolor"] = self.__bgcolors[coloridx]
+
+        # Merge passed in attributes
+        self.dot.graph_attr.update(graph_attr)
+
+    def __enter__(self):
+        setcluster(self)
+        return self
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        if self._parent:
+            self._parent.subgraph(self.dot)
+        else:
+            self._diagram.subgraph(self.dot)
+        setcluster(self._parent)
+        
\ No newline at end of file
diff --git a/diagrams/context.py b/diagrams/context.py
new file mode 100644
index 000000000..8677a5e85
--- /dev/null
+++ b/diagrams/context.py
@@ -0,0 +1,27 @@
+from graphviz import Digraph
+from abc import ABC, abstractmethod
+
+class Context(ABC):
+    __directions = ("TB", "BT", "LR", "RL")
+
+    def __init__(self, name, **kwargs):
+        self.name = name
+        self.dot = Digraph(self.name, **kwargs)
+
+    @abstractmethod
+    def __enter__(self):
+        pass
+
+    @abstractmethod
+    def __exit__(self, exc_type, exc_value, traceback):
+        pass
+
+    def _validate_direction(self, direction: str) -> bool:
+        return direction.upper() in self.__directions
+
+    def node(self, nodeid: str, label: str, **attrs) -> None:
+        """Create a new node in the cluster."""
+        self.dot.node(nodeid, label=label, **attrs)
+
+    def subgraph(self, dot: Digraph) -> None:
+        self.dot.subgraph(dot)
\ No newline at end of file
diff --git a/diagrams/diagram.py b/diagrams/diagram.py
new file mode 100644
index 000000000..a304f9ea1
--- /dev/null
+++ b/diagrams/diagram.py
@@ -0,0 +1,149 @@
+import os
+from .node import Node
+from .edge import Edge
+from typing import Optional
+from graphviz import Digraph
+from .context import Context
+from .utils import setdiagram
+
+
+class Diagram(Context):
+    __curvestyles = ("ortho", "curved")
+    __outformats = ("png", "jpg", "svg", "pdf", "dot")
+
+    # fmt: off
+    _default_graph_attrs = {
+        "pad": "2.0",
+        "splines": "ortho",
+        "nodesep": "0.60",
+        "ranksep": "0.75",
+        "fontname": "Sans-Serif",
+        "fontsize": "15",
+        "fontcolor": "#2D3436",
+    }
+    _default_node_attrs = {
+        "shape": "box",
+        "style": "rounded",
+        "fixedsize": "true",
+        "width": "1.4",
+        "height": "1.4",
+        "labelloc": "b",
+        # imagepos attribute is not backward compatible
+        # TODO: check graphviz version to see if "imagepos" is available >= 2.40
+        # https://github.com/xflr6/graphviz/blob/master/graphviz/backend.py#L248
+        # "imagepos": "tc",
+        "imagescale": "true",
+        "fontname": "Sans-Serif",
+        "fontsize": "13",
+        "fontcolor": "#2D3436",
+    }
+    _default_edge_attrs = {
+        "color": "#7B8894",
+    }
+
+    # fmt: on
+
+    # TODO: Label position option
+    # TODO: Save directory option (filename + directory?)
+    def __init__(
+        self,
+        name: str = "",
+        filename: str = "",
+        direction: str = "LR",
+        curvestyle: str = "ortho",
+        outformats: list = ["png"],
+        autolabel: bool = False,
+        show: bool = True,
+        strict: bool = False,
+        graph_attr: Optional[dict] = None,
+        node_attr: Optional[dict] = None,
+        edge_attr: Optional[dict] = None,
+    ):
+        """Diagram represents a global diagrams context.
+
+        :param name: Diagram name. It will be used for output filename if the
+            filename isn't given.
+        :param filename: The output filename, without the extension (.png).
+            If not given, it will be generated from the name.
+        :param direction: Data flow direction. Default is 'left to right'.
+        :param curvestyle: Curve bending style. One of "ortho" or "curved".
+        :param outformats: List of output file formats. Default is ['png'].
+        :param show: Open generated image after save if true, just only save otherwise.
+        :param graph_attr: Provide graph_attr dot config attributes.
+        :param node_attr: Provide node_attr dot config attributes.
+        :param edge_attr: Provide edge_attr dot config attributes.
+        :param strict: Rendering should merge multi-edges.
+        """
+        if graph_attr is None:
+            graph_attr = {}
+        if node_attr is None:
+            node_attr = {}
+        if edge_attr is None:
+            edge_attr = {}
+        
+        if not name and not filename:
+            filename = "diagrams_image"
+        elif not filename:
+            filename = "_".join(name.split()).lower()
+        self.filename = filename
+        super().__init__(name, filename=self.filename, strict=strict)
+
+        # Set attributes.
+        for k, v in self._default_graph_attrs.items():
+            self.dot.graph_attr[k] = v
+        self.dot.graph_attr["label"] = self.name
+        for k, v in self._default_node_attrs.items():
+            self.dot.node_attr[k] = v
+        for k, v in self._default_edge_attrs.items():
+            self.dot.edge_attr[k] = v
+
+        if not self._validate_direction(direction):
+            raise ValueError(f'"{direction}" is not a valid direction')
+        self.dot.graph_attr["rankdir"] = direction
+
+        if not self._validate_curvestyle(curvestyle):
+            raise ValueError(f'"{curvestyle}" is not a valid curvestyle')
+        self.dot.graph_attr["splines"] = curvestyle
+
+        for outformat in outformats:
+            if not self._validate_outformat(outformat):
+                raise ValueError(f'"{outformat}" is not a valid output format')
+        self.outformats = outformats
+
+        # Merge passed in attributes
+        self.dot.graph_attr.update(graph_attr)
+        self.dot.node_attr.update(node_attr)
+        self.dot.edge_attr.update(edge_attr)
+
+        self.show = show
+        self.autolabel = autolabel
+
+    def __str__(self) -> str:
+        return str(self.dot)
+
+    def __enter__(self):
+        setdiagram(self)
+        return self
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        self.render()
+        # Remove the graphviz file leaving only the image.
+        os.remove(self.filename)
+        setdiagram(None)
+
+    def _repr_png_(self):
+        return self.dot.pipe(format="png")
+
+    def _validate_curvestyle(self, curvestyle: str) -> bool:
+        return curvestyle.lower() in self.__curvestyles
+
+    def _validate_outformat(self, outformat: str) -> bool:
+        return outformat.lower() in self.__outformats
+
+    def connect(self, node: "Node", node2: "Node", edge: "Edge") -> None:
+        """Connect the two Nodes."""
+        self.dot.edge(node.nodeid, node2.nodeid, **edge.attrs)
+
+    def render(self) -> None:
+        for outformat in self.outformats:
+            self.dot.render(format=outformat, view=self.show, quiet=True)
diff --git a/diagrams/edge.py b/diagrams/edge.py
new file mode 100644
index 000000000..b4fc88e8e
--- /dev/null
+++ b/diagrams/edge.py
@@ -0,0 +1,119 @@
+from . import node
+from typing import List, Union, Dict
+
+class Edge:
+    """Edge represents an edge between two nodes."""
+
+    _default_edge_attrs = {
+        "fontcolor": "#2D3436",
+        "fontname": "Sans-Serif",
+        "fontsize": "13",
+    }
+
+    def __init__(
+        self,
+        n: "node.Node" = None,
+        forward: bool = False,
+        reverse: bool = False,
+        label: str = "",
+        color: str = "",
+        style: str = "",
+        **attrs: Dict,
+    ):
+        """Edge represents an edge between two nodes.
+
+        :param n: Parent node.
+        :param forward: Points forward.
+        :param reverse: Points backward.
+        :param label: Edge label.
+        :param color: Edge color.
+        :param style: Edge style.
+        :param attrs: Other edge attributes
+        """
+        if n is not None:
+            assert isinstance(n, node.Node)
+
+        self.node = n
+        self.forward = forward
+        self.reverse = reverse
+
+        self._attrs = {}
+
+        # Set attributes.
+        for k, v in self._default_edge_attrs.items():
+            self._attrs[k] = v
+
+        if label:
+            # Graphviz complaining about using label for edges, so replace it with xlabel.
+            # Update: xlabel option causes the misaligned label position: https://github.com/mingrammer/diagrams/issues/83
+            self._attrs["label"] = label
+        if color:
+            self._attrs["color"] = color
+        if style:
+            self._attrs["style"] = style
+        self._attrs.update(attrs)
+
+    def __sub__(self, other: Union["node.Node", "Edge", List["node.Node"]]):
+        """Implement Self - Node or Edge and Self - [Nodes]"""
+        return self.connect(other)
+
+    def __rsub__(self, other: Union[List["node.Node"], List["Edge"]]) -> List["Edge"]:
+        """Called for [Nodes] or [Edges] - Self because list don't have __sub__ operators."""
+        return self.append(other)
+
+    def __rshift__(self, other: Union["node.Node", "Edge", List["node.Node"]]):
+        """Implements Self >> Node or Edge and Self >> [Nodes]."""
+        self.forward = True
+        return self.connect(other)
+
+    def __lshift__(self, other: Union["node.Node", "Edge", List["node.Node"]]):
+        """Implements Self << Node or Edge and Self << [Nodes]."""
+        self.reverse = True
+        return self.connect(other)
+
+    def __rrshift__(self, other: Union[List["node.Node"], List["Edge"]]) -> List["Edge"]:
+        """Called for [Nodes] or [Edges] >> Self because list of Edges don't have __rshift__ operators."""
+        return self.append(other, forward=True)
+
+    def __rlshift__(self, other: Union[List["node.Node"], List["Edge"]]) -> List["Edge"]:
+        """Called for [Nodes] or [Edges] << Self because list of Edges don't have __lshift__ operators."""
+        return self.append(other, reverse=True)
+
+    def append(self, other: Union[List["node.Node"], List["Edge"]], forward=None, reverse=None) -> List["Edge"]:
+        result = []
+        for o in other:
+            if isinstance(o, Edge):
+                o.forward = forward if forward else o.forward
+                o.reverse = forward if forward else o.reverse
+                self._attrs = o.attrs.copy()
+                result.append(o)
+            else:
+                result.append(Edge(o, forward=forward, reverse=reverse, **self._attrs))
+        return result
+
+    def connect(self, other: Union["node.Node", "Edge", List["node.Node"]]):
+        if isinstance(other, list):
+            for n in other:
+                self.node.connect(n, self)
+            return other
+        elif isinstance(other, Edge):
+            self._attrs = other._attrs.copy()
+            return self
+        else:
+            if self.node is not None:
+                return self.node.connect(other, self)
+            else:
+                self.node = other
+                return self
+
+    @property
+    def attrs(self) -> Dict:
+        if self.forward and self.reverse:
+            direction = "both"
+        elif self.forward:
+            direction = "forward"
+        elif self.reverse:
+            direction = "back"
+        else:
+            direction = "none"
+        return {**self._attrs, "dir": direction}
\ No newline at end of file
diff --git a/diagrams/node.py b/diagrams/node.py
new file mode 100644
index 000000000..83f015ab9
--- /dev/null
+++ b/diagrams/node.py
@@ -0,0 +1,158 @@
+import os
+import uuid
+from pathlib import Path
+from typing import List, Union, Dict
+from .edge import Edge
+from .utils import getcluster, getdiagram
+
+class Node:
+    """Node represents a node for a specific backend service."""
+
+    _provider = None
+    _type = None
+
+    _icon_dir = None
+    _icon = None
+
+    _height = 1.9
+
+    def __init__(self, label: str = "", *, nodeid: str = None, **attrs: Dict):
+        """Node represents a system component.
+
+        :param label: Node label.
+        """
+        # Generates an ID for identifying a node, unless specified
+        self._id = nodeid or self._rand_id()
+        self.label = label
+
+        # Node must be belong to a diagrams.
+        self._diagram = getdiagram()
+        if self._diagram is None:
+            raise EnvironmentError("Global diagrams context not set up")
+
+        if self._diagram.autolabel:
+            prefix = self.__class__.__name__
+            if self.label:
+                self.label = prefix + "\n" + self.label
+            else:
+                self.label = prefix
+
+        # fmt: off
+        # If a node has an icon, increase the height slightly to avoid
+        # that label being spanned between icon image and white space.
+        # Increase the height by the number of new lines included in the label.
+        padding = 0.4 * (self.label.count('\n'))
+        self._attrs = {
+            "shape": "none",
+            "height": str(self._height + padding),
+            "image": self._load_icon(),
+        } if self._icon else {}
+
+        # fmt: on
+        self._attrs.update(attrs)
+
+        self._cluster = getcluster()
+
+        # If a node is in the cluster context, add it to cluster.
+        if self._cluster:
+            self._cluster.node(self._id, self.label, **self._attrs)
+        else:
+            self._diagram.node(self._id, self.label, **self._attrs)
+
+    def __repr__(self):
+        _name = self.__class__.__name__
+        return f"<{self._provider}.{self._type}.{_name}>"
+
+    def __sub__(self, other: Union["Node", List["Node"], "Edge"]):
+        """Implement Self - Node, Self - [Nodes] and Self - Edge."""
+        if isinstance(other, list):
+            for node in other:
+                self.connect(node, Edge(self))
+            return other
+        elif isinstance(other, Node):
+            return self.connect(other, Edge(self))
+        else:
+            other.node = self
+            return other
+
+    def __rsub__(self, other: Union[List["Node"], List["Edge"]]):
+        """Called for [Nodes] and [Edges] - Self because list don't have __sub__ operators."""
+        for o in other:
+            if isinstance(o, Edge):
+                o.connect(self)
+            else:
+                o.connect(self, Edge(self))
+        return self
+
+    def __rshift__(self, other: Union["Node", List["Node"], "Edge"]):
+        """Implements Self >> Node, Self >> [Nodes] and Self Edge."""
+        if isinstance(other, list):
+            for node in other:
+                self.connect(node, Edge(self, forward=True))
+            return other
+        elif isinstance(other, Node):
+            return self.connect(other, Edge(self, forward=True))
+        else:
+            other.forward = True
+            other.node = self
+            return other
+
+    def __lshift__(self, other: Union["Node", List["Node"], "Edge"]):
+        """Implements Self << Node, Self << [Nodes] and Self << Edge."""
+        if isinstance(other, list):
+            for node in other:
+                self.connect(node, Edge(self, reverse=True))
+            return other
+        elif isinstance(other, Node):
+            return self.connect(other, Edge(self, reverse=True))
+        else:
+            other.reverse = True
+            return other.connect(self)
+
+    def __rrshift__(self, other: Union[List["Node"], List["Edge"]]):
+        """Called for [Nodes] and [Edges] >> Self because list don't have __rshift__ operators."""
+        for o in other:
+            if isinstance(o, Edge):
+                o.forward = True
+                o.connect(self)
+            else:
+                o.connect(self, Edge(self, forward=True))
+        return self
+
+    def __rlshift__(self, other: Union[List["Node"], List["Edge"]]):
+        """Called for [Nodes] << Self because list of Nodes don't have __lshift__ operators."""
+        for o in other:
+            if isinstance(o, Edge):
+                o.reverse = True
+                o.connect(self)
+            else:
+                o.connect(self, Edge(self, reverse=True))
+        return self
+
+    @property
+    def nodeid(self):
+        return self._id
+
+    # TODO: option for adding flow description to the connection edge
+    def connect(self, node: "Node", edge: "Edge"):
+        """Connect to other node.
+
+        :param node: Other node instance.
+        :param edge: Type of the edge.
+        :return: Connected node.
+        """
+        if not isinstance(node, Node):
+            ValueError(f"{node} is not a valid Node")
+        if not isinstance(edge, Edge):
+            ValueError(f"{edge} is not a valid Edge")
+        # An edge must be added on the global diagrams, not a cluster.
+        self._diagram.connect(self, node, edge)
+        return node
+
+    @staticmethod
+    def _rand_id():
+        return uuid.uuid4().hex
+
+    def _load_icon(self):
+        basedir = Path(os.path.abspath(os.path.dirname(__file__)))
+        return os.path.join(basedir.parent, self._icon_dir, self._icon)
diff --git a/diagrams/utils.py b/diagrams/utils.py
new file mode 100644
index 000000000..706508f21
--- /dev/null
+++ b/diagrams/utils.py
@@ -0,0 +1,31 @@
+import contextvars
+
+# Global contexts for a diagrams and a cluster.
+#
+# These global contexts are for letting the clusters and nodes know
+# where context they are belong to. So the all clusters and nodes does
+# not need to specify the current diagrams or cluster via parameters.
+__diagram = contextvars.ContextVar("diagrams")
+__cluster = contextvars.ContextVar("cluster")
+
+
+def getdiagram() -> "Diagram":
+    try:
+        return __diagram.get()
+    except LookupError:
+        return None
+
+
+def setdiagram(diagram: "Diagram"):
+    __diagram.set(diagram)
+
+
+def getcluster() -> "Cluster":
+    try:
+        return __cluster.get()
+    except LookupError:
+        return None
+
+
+def setcluster(cluster: "Cluster"):
+    __cluster.set(cluster)
\ No newline at end of file
diff --git a/poetry.lock b/poetry.lock
index 3c271de36..5432b5d1d 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,15 +1,14 @@
-# This file is automatically @generated by Poetry and should not be changed by hand.
+# This file is automatically @generated by Poetry 1.5.1 and should not be changed by hand.
 
 [[package]]
 name = "astroid"
-version = "2.9.0"
+version = "2.11.7"
 description = "An abstract syntax tree for Python with inference support."
-category = "dev"
 optional = false
-python-versions = "~=3.6"
+python-versions = ">=3.6.2"
 files = [
-    {file = "astroid-2.9.0-py3-none-any.whl", hash = "sha256:776ca0b748b4ad69c00bfe0fff38fa2d21c338e12c84aa9715ee0d473c422778"},
-    {file = "astroid-2.9.0.tar.gz", hash = "sha256:5939cf55de24b92bda00345d4d0659d01b3c7dafb5055165c330bc7c568ba273"},
+    {file = "astroid-2.11.7-py3-none-any.whl", hash = "sha256:86b0a340a512c65abf4368b80252754cda17c02cdbbd3f587dddf98112233e7b"},
+    {file = "astroid-2.11.7.tar.gz", hash = "sha256:bb24615c77f4837c707669d16907331374ae8a964650a66999da3f5ca68dc946"},
 ]
 
 [package.dependencies]
@@ -17,13 +16,12 @@ lazy-object-proxy = ">=1.4.0"
 setuptools = ">=20.0"
 typed-ast = {version = ">=1.4.0,<2.0", markers = "implementation_name == \"cpython\" and python_version < \"3.8\""}
 typing-extensions = {version = ">=3.10", markers = "python_version < \"3.10\""}
-wrapt = ">=1.11,<1.14"
+wrapt = ">=1.11,<2"
 
 [[package]]
 name = "black"
 version = "22.12.0"
 description = "The uncompromising code formatter."
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -58,14 +56,13 @@ uvloop = ["uvloop (>=0.15.2)"]
 
 [[package]]
 name = "click"
-version = "8.1.3"
+version = "8.1.6"
 description = "Composable command line interface toolkit"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
-    {file = "click-8.1.3-py3-none-any.whl", hash = "sha256:bb4d8133cb15a609f44e8213d9b391b0809795062913b383c62be0ee95b1db48"},
-    {file = "click-8.1.3.tar.gz", hash = "sha256:7682dc8afb30297001674575ea00d1814d808d6a36af415a82bd481d37ba7b8e"},
+    {file = "click-8.1.6-py3-none-any.whl", hash = "sha256:fa244bb30b3b5ee2cae3da8f55c9e5e0c0e86093306301fb418eb9dc40fbded5"},
+    {file = "click-8.1.6.tar.gz", hash = "sha256:48ee849951919527a045bfe3bf7baa8a959c423134e1a5b98c05c20ba75a1cbd"},
 ]
 
 [package.dependencies]
@@ -74,26 +71,38 @@ importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
 
 [[package]]
 name = "colorama"
-version = "0.4.3"
+version = "0.4.6"
 description = "Cross-platform colored terminal text."
-category = "dev"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*,>=2.7"
 files = [
-    {file = "colorama-0.4.3-py2.py3-none-any.whl", hash = "sha256:7d73d2a99753107a36ac6b455ee49046802e59d9d076ef8e47b61499fa29afff"},
-    {file = "colorama-0.4.3.tar.gz", hash = "sha256:e96da0d330793e2cb9485e9ddfd918d456036c7149416295932478192f4436a1"},
+    {file = "colorama-0.4.6-py2.py3-none-any.whl", hash = "sha256:4f1d9991f5acc0ca119f9d443620b77f9d6b33703e51011c16baf57afb285fc6"},
+    {file = "colorama-0.4.6.tar.gz", hash = "sha256:08695f5cb7ed6e0531a20572697297273c47b8cae5a63ffc6d6ed5c201be6e44"},
 ]
 
+[[package]]
+name = "dill"
+version = "0.3.7"
+description = "serialize all of Python"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "dill-0.3.7-py3-none-any.whl", hash = "sha256:76b122c08ef4ce2eedcd4d1abd8e641114bfc6c2867f49f3c41facf65bf19f5e"},
+    {file = "dill-0.3.7.tar.gz", hash = "sha256:cc1c8b182eb3013e24bd475ff2e9295af86c1a38eb1aff128dac8962a9ce3c03"},
+]
+
+[package.extras]
+graph = ["objgraph (>=1.7.2)"]
+
 [[package]]
 name = "exceptiongroup"
-version = "1.1.0"
+version = "1.1.2"
 description = "Backport of PEP 654 (exception groups)"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
-    {file = "exceptiongroup-1.1.0-py3-none-any.whl", hash = "sha256:327cbda3da756e2de031a3107b81ab7b3770a602c4d16ca618298c526f4bec1e"},
-    {file = "exceptiongroup-1.1.0.tar.gz", hash = "sha256:bcb67d800a4497e1b404c2dd44fca47d3b7a5e5433dbab67f96c1a685cdfdf23"},
+    {file = "exceptiongroup-1.1.2-py3-none-any.whl", hash = "sha256:e346e69d186172ca7cf029c8c1d16235aa0e04035e5750b4b95039e65204328f"},
+    {file = "exceptiongroup-1.1.2.tar.gz", hash = "sha256:12c3e887d6485d16943a309616de20ae5582633e0a2eda17f4e10fd61c1e8af5"},
 ]
 
 [package.extras]
@@ -103,7 +112,6 @@ test = ["pytest (>=6)"]
 name = "graphviz"
 version = "0.20.1"
 description = "Simple Python interface for Graphviz"
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -116,42 +124,52 @@ dev = ["flake8", "pep8-naming", "tox (>=3)", "twine", "wheel"]
 docs = ["sphinx (>=5)", "sphinx-autodoc-typehints", "sphinx-rtd-theme"]
 test = ["coverage", "mock (>=4)", "pytest (>=7)", "pytest-cov", "pytest-mock (>=3)"]
 
+[[package]]
+name = "html3"
+version = "1.18"
+description = "simple, elegant HTML, XHTML and XML generation for python3 (based on html)"
+optional = false
+python-versions = ">=3.5"
+files = [
+    {file = "html3-1.18-py3-none-any.whl", hash = "sha256:83756c2af7e63b36e334c7581726ca955d054d7992948dea6abf57ec256c3a60"},
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 [package.dependencies]
+typing-extensions = {version = ">=3.6.4", markers = "python_version < \"3.8\""}
 zipp = ">=0.5"
 
 [package.extras]
-docs = ["rst.linker", "sphinx"]
-testing = ["importlib-resources", "packaging"]
+docs = ["furo", "jaraco.packaging (>=9)", "jaraco.tidelift (>=1.4)", "rst.linker (>=1.9)", "sphinx (>=3.5)", "sphinx-lint"]
+perf = ["ipython"]
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 [[package]]
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-version = "1.1.1"
-description = "iniconfig: brain-dead simple config-ini parsing"
-category = "dev"
+version = "2.0.0"
+description = "brain-dead simple config-ini parsing"
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-python-versions = "*"
+python-versions = ">=3.7"
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-category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 files = [
@@ -169,7 +187,6 @@ xdg-home = ["appdirs (>=1.4.0)"]
 name = "jinja2"
 version = "3.1.2"
 description = "A very fast and expressive template engine."
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -185,191 +202,179 @@ i18n = ["Babel (>=2.7)"]
 
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+    {file = "MarkupSafe-2.1.3-cp39-cp39-musllinux_1_1_x86_64.whl", hash = "sha256:0a4e4a1aff6c7ac4cd55792abf96c915634c2b97e3cc1c7129578aa68ebd754e"},
+    {file = "MarkupSafe-2.1.3-cp39-cp39-win32.whl", hash = "sha256:fec21693218efe39aa7f8599346e90c705afa52c5b31ae019b2e57e8f6542bb2"},
+    {file = "MarkupSafe-2.1.3-cp39-cp39-win_amd64.whl", hash = "sha256:3fd4abcb888d15a94f32b75d8fd18ee162ca0c064f35b11134be77050296d6ba"},
+    {file = "MarkupSafe-2.1.3.tar.gz", hash = "sha256:af598ed32d6ae86f1b747b82783958b1a4ab8f617b06fe68795c7f026abbdcad"},
 ]
 
 [[package]]
 name = "mccabe"
-version = "0.6.1"
+version = "0.7.0"
 description = "McCabe checker, plugin for flake8"
-category = "dev"
 optional = false
-python-versions = "*"
+python-versions = ">=3.6"
 files = [
-    {file = "mccabe-0.6.1-py2.py3-none-any.whl", hash = "sha256:ab8a6258860da4b6677da4bd2fe5dc2c659cff31b3ee4f7f5d64e79735b80d42"},
-    {file = "mccabe-0.6.1.tar.gz", hash = "sha256:dd8d182285a0fe56bace7f45b5e7d1a6ebcbf524e8f3bd87eb0f125271b8831f"},
+    {file = "mccabe-0.7.0-py2.py3-none-any.whl", hash = "sha256:6c2d30ab6be0e4a46919781807b4f0d834ebdd6c6e3dca0bda5a15f863427b6e"},
+    {file = "mccabe-0.7.0.tar.gz", hash = "sha256:348e0240c33b60bbdf4e523192ef919f28cb2c3d7d5c7794f74009290f236325"},
 ]
 
 [[package]]
 name = "mypy-extensions"
-version = "0.4.3"
-description = "Experimental type system extensions for programs checked with the mypy typechecker."
-category = "dev"
+version = "1.0.0"
+description = "Type system extensions for programs checked with the mypy type checker."
 optional = false
-python-versions = "*"
+python-versions = ">=3.5"
 files = [
-    {file = "mypy_extensions-0.4.3-py2.py3-none-any.whl", hash = "sha256:090fedd75945a69ae91ce1303b5824f428daf5a028d2f6ab8a299250a846f15d"},
-    {file = "mypy_extensions-0.4.3.tar.gz", hash = "sha256:2d82818f5bb3e369420cb3c4060a7970edba416647068eb4c5343488a6c604a8"},
+    {file = "mypy_extensions-1.0.0-py3-none-any.whl", hash = "sha256:4392f6c0eb8a5668a69e23d168ffa70f0be9ccfd32b5cc2d26a34ae5b844552d"},
+    {file = "mypy_extensions-1.0.0.tar.gz", hash = "sha256:75dbf8955dc00442a438fc4d0666508a9a97b6bd41aa2f0ffe9d2f2725af0782"},
 ]
 
 [[package]]
 name = "packaging"
-version = "20.8"
+version = "23.1"
 description = "Core utilities for Python packages"
-category = "dev"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+python-versions = ">=3.7"
 files = [
-    {file = "packaging-20.8-py2.py3-none-any.whl", hash = "sha256:24e0da08660a87484d1602c30bb4902d74816b6985b93de36926f5bc95741858"},
-    {file = "packaging-20.8.tar.gz", hash = "sha256:78598185a7008a470d64526a8059de9aaa449238f280fc9eb6b13ba6c4109093"},
+    {file = "packaging-23.1-py3-none-any.whl", hash = "sha256:994793af429502c4ea2ebf6bf664629d07c1a9fe974af92966e4b8d2df7edc61"},
+    {file = "packaging-23.1.tar.gz", hash = "sha256:a392980d2b6cffa644431898be54b0045151319d1e7ec34f0cfed48767dd334f"},
 ]
 
-[package.dependencies]
-pyparsing = ">=2.0.2"
-
 [[package]]
 name = "pathspec"
-version = "0.10.1"
+version = "0.11.1"
 description = "Utility library for gitignore style pattern matching of file paths."
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
-    {file = "pathspec-0.10.1-py3-none-any.whl", hash = "sha256:46846318467efc4556ccfd27816e004270a9eeeeb4d062ce5e6fc7a87c573f93"},
-    {file = "pathspec-0.10.1.tar.gz", hash = "sha256:7ace6161b621d31e7902eb6b5ae148d12cfd23f4a249b9ffb6b9fee12084323d"},
+    {file = "pathspec-0.11.1-py3-none-any.whl", hash = "sha256:d8af70af76652554bd134c22b3e8a1cc46ed7d91edcdd721ef1a0c51a84a5293"},
+    {file = "pathspec-0.11.1.tar.gz", hash = "sha256:2798de800fa92780e33acca925945e9a19a133b715067cf165b8866c15a31687"},
 ]
 
 [[package]]
 name = "platformdirs"
-version = "2.4.0"
-description = "A small Python module for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
-category = "dev"
+version = "3.9.1"
+description = "A small Python package for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
 optional = false
-python-versions = ">=3.6"
+python-versions = ">=3.7"
 files = [
-    {file = "platformdirs-2.4.0-py3-none-any.whl", hash = "sha256:8868bbe3c3c80d42f20156f22e7131d2fb321f5bc86a2a345375c6481a67021d"},
-    {file = "platformdirs-2.4.0.tar.gz", hash = "sha256:367a5e80b3d04d2428ffa76d33f124cf11e8fff2acdaa9b43d545f5c7d661ef2"},
+    {file = "platformdirs-3.9.1-py3-none-any.whl", hash = "sha256:ad8291ae0ae5072f66c16945166cb11c63394c7a3ad1b1bc9828ca3162da8c2f"},
+    {file = "platformdirs-3.9.1.tar.gz", hash = "sha256:1b42b450ad933e981d56e59f1b97495428c9bd60698baab9f3eb3d00d5822421"},
 ]
 
+[package.dependencies]
+typing-extensions = {version = ">=4.6.3", markers = "python_version < \"3.8\""}
+
 [package.extras]
-docs = ["Sphinx (>=4)", "furo (>=2021.7.5b38)", "proselint (>=0.10.2)", "sphinx-autodoc-typehints (>=1.12)"]
-test = ["appdirs (==1.4.4)", "pytest (>=6)", "pytest-cov (>=2.7)", "pytest-mock (>=3.6)"]
+docs = ["furo (>=2023.5.20)", "proselint (>=0.13)", "sphinx (>=7.0.1)", "sphinx-autodoc-typehints (>=1.23,!=1.23.4)"]
+test = ["appdirs (==1.4.4)", "covdefaults (>=2.3)", "pytest (>=7.3.1)", "pytest-cov (>=4.1)", "pytest-mock (>=3.10)"]
 
 [[package]]
 name = "pluggy"
-version = "0.13.1"
+version = "1.2.0"
 description = "plugin and hook calling mechanisms for python"
-category = "dev"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+python-versions = ">=3.7"
 files = [
-    {file = "pluggy-0.13.1-py2.py3-none-any.whl", hash = "sha256:966c145cd83c96502c3c3868f50408687b38434af77734af1e9ca461a4081d2d"},
-    {file = "pluggy-0.13.1.tar.gz", hash = "sha256:15b2acde666561e1298d71b523007ed7364de07029219b604cf808bfa1c765b0"},
+    {file = "pluggy-1.2.0-py3-none-any.whl", hash = "sha256:c2fd55a7d7a3863cba1a013e4e2414658b1d07b6bc57b3919e0c63c9abb99849"},
+    {file = "pluggy-1.2.0.tar.gz", hash = "sha256:d12f0c4b579b15f5e054301bb226ee85eeeba08ffec228092f8defbaa3a4c4b3"},
 ]
 
 [package.dependencies]
@@ -377,50 +382,41 @@ importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
 
 [package.extras]
 dev = ["pre-commit", "tox"]
+testing = ["pytest", "pytest-benchmark"]
 
 [[package]]
 name = "pylint"
-version = "2.12.0"
+version = "2.13.9"
 description = "python code static checker"
-category = "dev"
 optional = false
-python-versions = "~=3.6"
+python-versions = ">=3.6.2"
 files = [
-    {file = "pylint-2.12.0-py3-none-any.whl", hash = "sha256:ba00afcb1550bc217bbcb0eb76c10cb8335f7417a3323bdd980c29fb5b59f8d2"},
-    {file = "pylint-2.12.0.tar.gz", hash = "sha256:245c87e5da54c35b623c21b35debf87d93b18bf9e0229515cc172d0b83d627cd"},
+    {file = "pylint-2.13.9-py3-none-any.whl", hash = "sha256:705c620d388035bdd9ff8b44c5bcdd235bfb49d276d488dd2c8ff1736aa42526"},
+    {file = "pylint-2.13.9.tar.gz", hash = "sha256:095567c96e19e6f57b5b907e67d265ff535e588fe26b12b5ebe1fc5645b2c731"},
 ]
 
 [package.dependencies]
-astroid = ">=2.9.0,<2.10"
+astroid = ">=2.11.5,<=2.12.0-dev0"
 colorama = {version = "*", markers = "sys_platform == \"win32\""}
+dill = ">=0.2"
 isort = ">=4.2.5,<6"
-mccabe = ">=0.6,<0.7"
+mccabe = ">=0.6,<0.8"
 platformdirs = ">=2.2.0"
-toml = ">=0.9.2"
+tomli = {version = ">=1.1.0", markers = "python_version < \"3.11\""}
 typing-extensions = {version = ">=3.10.0", markers = "python_version < \"3.10\""}
 
-[[package]]
-name = "pyparsing"
-version = "2.4.7"
-description = "Python parsing module"
-category = "dev"
-optional = false
-python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
-files = [
-    {file = "pyparsing-2.4.7-py2.py3-none-any.whl", hash = "sha256:ef9d7589ef3c200abe66653d3f1ab1033c3c419ae9b9bdb1240a85b024efc88b"},
-    {file = "pyparsing-2.4.7.tar.gz", hash = "sha256:c203ec8783bf771a155b207279b9bccb8dea02d8f0c9e5f8ead507bc3246ecc1"},
-]
+[package.extras]
+testutil = ["gitpython (>3)"]
 
 [[package]]
 name = "pytest"
-version = "7.3.0"
+version = "7.4.0"
 description = "pytest: simple powerful testing with Python"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
-    {file = "pytest-7.3.0-py3-none-any.whl", hash = "sha256:933051fa1bfbd38a21e73c3960cebdad4cf59483ddba7696c48509727e17f201"},
-    {file = "pytest-7.3.0.tar.gz", hash = "sha256:58ecc27ebf0ea643ebfdf7fb1249335da761a00c9f955bcd922349bcb68ee57d"},
+    {file = "pytest-7.4.0-py3-none-any.whl", hash = "sha256:78bf16451a2eb8c7a2ea98e32dc119fd2aa758f1d5d66dbf0a59d69a3969df32"},
+    {file = "pytest-7.4.0.tar.gz", hash = "sha256:b4bf8c45bd59934ed84001ad51e11b4ee40d40a1229d2c79f9c592b0a3f6bd8a"},
 ]
 
 [package.dependencies]
@@ -433,13 +429,12 @@ pluggy = ">=0.12,<2.0"
 tomli = {version = ">=1.0.0", markers = "python_version < \"3.11\""}
 
 [package.extras]
-testing = ["argcomplete", "attrs (>=19.2.0)", "hypothesis (>=3.56)", "mock", "nose", "pygments (>=2.7.2)", "requests", "xmlschema"]
+testing = ["argcomplete", "attrs (>=19.2.0)", "hypothesis (>=3.56)", "mock", "nose", "pygments (>=2.7.2)", "requests", "setuptools", "xmlschema"]
 
 [[package]]
 name = "rope"
 version = "0.14.0"
 description = "a python refactoring library..."
-category = "dev"
 optional = false
 python-versions = "*"
 files = [
@@ -450,118 +445,192 @@ files = [
 
 [[package]]
 name = "setuptools"
-version = "59.6.0"
+version = "68.0.0"
 description = "Easily download, build, install, upgrade, and uninstall Python packages"
-category = "dev"
 optional = false
-python-versions = ">=3.6"
+python-versions = ">=3.7"
 files = [
-    {file = "setuptools-59.6.0-py3-none-any.whl", hash = "sha256:4ce92f1e1f8f01233ee9952c04f6b81d1e02939d6e1b488428154974a4d0783e"},
-    {file = "setuptools-59.6.0.tar.gz", hash = "sha256:22c7348c6d2976a52632c67f7ab0cdf40147db7789f9aed18734643fe9cf3373"},
+    {file = "setuptools-68.0.0-py3-none-any.whl", hash = "sha256:11e52c67415a381d10d6b462ced9cfb97066179f0e871399e006c4ab101fc85f"},
+    {file = "setuptools-68.0.0.tar.gz", hash = "sha256:baf1fdb41c6da4cd2eae722e135500da913332ab3f2f5c7d33af9b492acb5235"},
 ]
 
 [package.extras]
-docs = ["furo", "jaraco.packaging (>=8.2)", "jaraco.tidelift (>=1.4)", "pygments-github-lexers (==0.0.5)", "rst.linker (>=1.9)", "sphinx", "sphinx-inline-tabs", "sphinxcontrib-towncrier"]
-testing = ["flake8-2020", "jaraco.envs (>=2.2)", "jaraco.path (>=3.2.0)", "mock", "paver", "pip (>=19.1)", "pytest (>=6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=1.0.1)", "pytest-flake8", "pytest-mypy", "pytest-virtualenv (>=1.2.7)", "pytest-xdist", "sphinx", "virtualenv (>=13.0.0)", "wheel"]
-
-[[package]]
-name = "toml"
-version = "0.10.0"
-description = "Python Library for Tom's Obvious, Minimal Language"
-category = "dev"
-optional = false
-python-versions = "*"
-files = [
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-    {file = "toml-0.10.0.tar.gz", hash = "sha256:229f81c57791a41d65e399fc06bf0848bab550a9dfd5ed66df18ce5f05e73d5c"},
-]
+docs = ["furo", "jaraco.packaging (>=9)", "jaraco.tidelift (>=1.4)", "pygments-github-lexers (==0.0.5)", "rst.linker (>=1.9)", "sphinx (>=3.5)", "sphinx-favicon", "sphinx-hoverxref (<2)", "sphinx-inline-tabs", "sphinx-lint", "sphinx-notfound-page (==0.8.3)", "sphinx-reredirects", "sphinxcontrib-towncrier"]
+testing = ["build[virtualenv]", "filelock (>=3.4.0)", "flake8-2020", "ini2toml[lite] (>=0.9)", "jaraco.envs (>=2.2)", "jaraco.path (>=3.2.0)", "pip (>=19.1)", "pip-run (>=8.8)", "pytest (>=6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=1.3)", "pytest-mypy (>=0.9.1)", "pytest-perf", "pytest-ruff", "pytest-timeout", "pytest-xdist", "tomli-w (>=1.0.0)", "virtualenv (>=13.0.0)", "wheel"]
+testing-integration = ["build[virtualenv]", "filelock (>=3.4.0)", "jaraco.envs (>=2.2)", "jaraco.path (>=3.2.0)", "pytest", "pytest-enabler", "pytest-xdist", "tomli", "virtualenv (>=13.0.0)", "wheel"]
 
 [[package]]
 name = "tomli"
-version = "1.2.3"
+version = "2.0.1"
 description = "A lil' TOML parser"
-category = "dev"
 optional = false
-python-versions = ">=3.6"
+python-versions = ">=3.7"
 files = [
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-    {file = "tomli-1.2.3.tar.gz", hash = "sha256:05b6166bff487dc068d322585c7ea4ef78deed501cc124060e0f238e89a9231f"},
+    {file = "tomli-2.0.1-py3-none-any.whl", hash = "sha256:939de3e7a6161af0c887ef91b7d41a53e7c5a1ca976325f429cb46ea9bc30ecc"},
+    {file = "tomli-2.0.1.tar.gz", hash = "sha256:de526c12914f0c550d15924c62d72abc48d6fe7364aa87328337a31007fe8a4f"},
 ]
 
 [[package]]
 name = "typed-ast"
-version = "1.5.4"
+version = "1.5.5"
 description = "a fork of Python 2 and 3 ast modules with type comment support"
-category = "main"
 optional = false
 python-versions = ">=3.6"
 files = [
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 ]
 
 [[package]]
 name = "zipp"
-version = "3.1.0"
+version = "3.15.0"
 description = "Backport of pathlib-compatible object wrapper for zip files"
-category = "dev"
 optional = false
-python-versions = ">=3.6"
+python-versions = ">=3.7"
 files = [
-    {file = "zipp-3.1.0-py3-none-any.whl", hash = "sha256:aa36550ff0c0b7ef7fa639055d797116ee891440eac1a56f378e2d3179e0320b"},
-    {file = "zipp-3.1.0.tar.gz", hash = "sha256:c599e4d75c98f6798c509911d08a22e6c021d074469042177c8c86fb92eefd96"},
+    {file = "zipp-3.15.0-py3-none-any.whl", hash = "sha256:48904fc76a60e542af151aded95726c1a5c34ed43ab4134b597665c86d7ad556"},
+    {file = "zipp-3.15.0.tar.gz", hash = "sha256:112929ad649da941c23de50f356a2b5570c954b65150642bccdd66bf194d224b"},
 ]
 
 [package.extras]
-docs = ["jaraco.packaging (>=3.2)", "rst.linker (>=1.9)", "sphinx"]
-testing = ["func-timeout", "jaraco.itertools"]
+docs = ["furo", "jaraco.packaging (>=9)", "jaraco.tidelift (>=1.4)", "rst.linker (>=1.9)", "sphinx (>=3.5)", "sphinx-lint"]
+testing = ["big-O", "flake8 (<5)", "jaraco.functools", "jaraco.itertools", "more-itertools", "pytest (>=6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=1.3)", "pytest-flake8", "pytest-mypy (>=0.9.1)"]
 
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.7"
-content-hash = "5c2b82d1c8a6a283f63558fc693271f42fdcaeab73616713eb9b38b0b59787fc"
+content-hash = "43397b26df9c6dbc5bf88dad18b65d5b4fba2cdbbe9ad81bfeacd34651a8bb97"
diff --git a/pyproject.toml b/pyproject.toml
index 05eb30082..70d833205 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -15,6 +15,8 @@ graphviz = ">=0.13.2,<0.21.0"
 jinja2 = ">=2.10,<4.0"
 contextvars = { version = "^2.4", python = "~3.6" }
 typed-ast = "^1.5.4"
+black = "^22.10.0"
+html3 = "1.18"
 
 [tool.poetry.dev-dependencies]
 pytest = "^7.3"
diff --git a/tests/test_diagram.py b/tests/test_diagram.py
index 00bdacc6e..d67229bd7 100644
--- a/tests/test_diagram.py
+++ b/tests/test_diagram.py
@@ -47,12 +47,12 @@ def test_validate_curvestyle(self):
     def test_validate_outformat(self):
         # Normal output formats.
         for fmt in ("png", "jpg", "svg", "pdf", "PNG", "dot"):
-            Diagram(outformat=fmt)
+            Diagram(outformats=[fmt])
 
         # Invalid output formats.
         for fmt in ("pnp", "jpe", "unknown"):
             with self.assertRaises(ValueError):
-                Diagram(outformat=fmt)
+                Diagram(outformats=[fmt])
 
     def test_with_global_context(self):
         self.assertIsNone(getdiagram())
@@ -115,12 +115,14 @@ def test_autolabel(self):
 
 
     def test_outformat_list(self):
-        """Check that outformat render all the files from the list."""
+        """Check that outformats render all the files from the list."""
         self.name = 'diagrams_image'
-        with Diagram(show=False, outformat=["dot", "png"]):
+        with Diagram(show=False, outformats=["dot", "png", "svg", "pdf"]):
             Node("node1")
         # both files must exist
         self.assertTrue(os.path.exists(f"{self.name}.png"))
+        self.assertTrue(os.path.exists(f"{self.name}.svg"))
+        self.assertTrue(os.path.exists(f"{self.name}.pdf"))
         self.assertTrue(os.path.exists(f"{self.name}.dot"))
 
         # clean the dot file as it only generated here