refactor: Add Node metadata (#1229)

* refactor: `Slot.source` replaced with `Slot.fill_node`, new `Component.node` property, and `slot_node` available in `on_slot_rendered()` hook.

* refactor: fix windows path error in tests

tests/test_node.py

@@ -1,12 +1,15 @@
 import inspect
+import os
 import re
+from typing import cast
+
 import pytest
 from django.template import Context, Template
 from django.template.base import TextNode, VariableNode
 from django.template.defaulttags import IfNode, LoremNode
 from django.template.exceptions import TemplateSyntaxError
 
-from django_components import types
+from django_components import Component, types
 from django_components.node import BaseNode, template_tag
 from django_components.templatetags import component_tags
 from django_components.util.tag_parser import TagAttr
@@ -849,7 +852,14 @@ class TestSignatureBasedValidation:
             @force_signature_validation
             def render(self, context: Context, name: str, **kwargs) -> str:
                 nonlocal captured
-                captured = self.params, self.nodelist, self.node_id, self.contents
+                captured = (
+                    self.params,
+                    self.nodelist,
+                    self.node_id,
+                    self.contents,
+                    self.template_name,
+                    self.template_component,
+                )
                 return f"Hello, {name}!"
 
         # Case 1 - Node with end tag and NOT self-closing
@@ -864,7 +874,7 @@ class TestSignatureBasedValidation:
         template1 = Template(template_str1)
         template1.render(Context({}))
 
-        params1, nodelist1, node_id1, contents1 = captured  # type: ignore
+        params1, nodelist1, node_id1, contents1, template_name1, template_component1 = captured  # type: ignore
         assert len(params1) == 1
         assert isinstance(params1[0], TagAttr)
         # NOTE: The comment node is not included in the nodelist
@@ -879,6 +889,8 @@ class TestSignatureBasedValidation:
         assert isinstance(nodelist1[7], TextNode)
         assert contents1 == "\n              INSIDE TAG {{ my_var }} {# comment #} {% lorem 1 w %} {% if True %} henlo {% endif %}\n            "  # noqa: E501
         assert node_id1 == "a1bc3e"
+        assert template_name1 == '<unknown source>'
+        assert template_component1 is None
 
         captured = None  # Reset captured
 
@@ -890,12 +902,14 @@ class TestSignatureBasedValidation:
         template2 = Template(template_str2)
         template2.render(Context({}))
 
-        params2, nodelist2, node_id2, contents2 = captured  # type: ignore
+        params2, nodelist2, node_id2, contents2, template_name2, template_component2 = captured  # type: ignore
         assert len(params2) == 1  # type: ignore
         assert isinstance(params2[0], TagAttr)  # type: ignore
         assert len(nodelist2) == 0  # type: ignore
         assert contents2 is None  # type: ignore
         assert node_id2 == "a1bc3f"  # type: ignore
+        assert template_name2 == '<unknown source>'  # type: ignore
+        assert template_component2 is None  # type: ignore
 
         captured = None  # Reset captured
 
@@ -906,7 +920,7 @@ class TestSignatureBasedValidation:
             @force_signature_validation
             def render(self, context: Context, name: str, **kwargs) -> str:
                 nonlocal captured
-                captured = self.params, self.nodelist, self.node_id, self.contents
+                captured = self.params, self.nodelist, self.node_id, self.contents, self.template_name, self.template_component  # noqa: E501
                 return f"Hello, {name}!"
 
         TestNodeWithoutEndTag.register(component_tags.register)
@@ -918,12 +932,38 @@ class TestSignatureBasedValidation:
         template3 = Template(template_str3)
         template3.render(Context({}))
 
-        params3, nodelist3, node_id3, contents3 = captured  # type: ignore
+        params3, nodelist3, node_id3, contents3, template_name3, template_component3 = captured  # type: ignore
         assert len(params3) == 1  # type: ignore
         assert isinstance(params3[0], TagAttr)  # type: ignore
         assert len(nodelist3) == 0  # type: ignore
         assert contents3 is None  # type: ignore
         assert node_id3 == "a1bc40"  # type: ignore
+        assert template_name3 == '<unknown source>'  # type: ignore
+        assert template_component3 is None  # type: ignore
+
+        # Case 4 - Node nested in Component end tag
+        class TestComponent(Component):
+            template = """
+                {% load component_tags %}
+                {% mytag2 'John' %}
+            """
+
+        TestComponent.render(Context({}))
+
+        params4, nodelist4, node_id4, contents4, template_name4, template_component4 = captured  # type: ignore
+        assert len(params4) == 1  # type: ignore
+        assert isinstance(params4[0], TagAttr)  # type: ignore
+        assert len(nodelist4) == 0  # type: ignore
+        assert contents4 is None  # type: ignore
+        assert node_id4 == "a1bc42"  # type: ignore
+
+        if os.name == "nt":
+            assert cast(str, template_name4).endswith("\\tests\\test_node.py::TestComponent")  # type: ignore
+        else:
+            assert cast(str, template_name4).endswith("/tests/test_node.py::TestComponent")  # type: ignore
+
+        assert template_name4 == f"{__file__}::TestComponent"  # type: ignore
+        assert template_component4 is TestComponent  # type: ignore
 
         # Cleanup
         TestNodeWithEndTag.unregister(component_tags.register)