enh(python) treat self as a keyword (#4025)

CHANGES.md

@@ -21,6 +21,7 @@ Core Grammars:
 - fix(csharp) add raw string highlighting for C# 11. [Tara][]
 - fix(bash) fix # within token being detected as the start of a comment [Felix Uhl][]
 - fix(python) fix `or` conflicts with string highlighting [Mohamed Ali][]
+- enh(python) adds a scope to the `self` variable [Lee Falin][]
 - enh(delphi) allow digits to be omitted for hex and binary literals [Jonah Jeleniewski][]
 - enh(delphi) add support for digit separators [Jonah Jeleniewski][]
 - enh(delphi) add support for character strings with non-decimal numerics [Jonah Jeleniewski][]

src/languages/python.js

@@ -373,7 +373,8 @@ export default function(hljs) {
       NUMBER,
       {
         // very common convention
-        begin: /\bself\b/
+        scope: 'variable.language',
+        match: /\bself\b/
       },
       {
         // eat "if" prior to string so that it won't accidentally be

test/markup/python/class_self.expect.txt

@@ -0,0 +1,6 @@
+<span class="hljs-keyword">class</span> <span class="hljs-title class_">SelfTest</span>:
+    <span class="hljs-keyword">def</span> <span class="hljs-title function_">__init__</span>(<span class="hljs-params">self</span>):
+        <span class="hljs-variable language_">self</span>.text = <span class="hljs-literal">True</span>
+
+    <span class="hljs-keyword">def</span> <span class="hljs-title function_">method</span>(<span class="hljs-params">self</span>):
+        <span class="hljs-keyword">pass</span>

test/markup/python/class_self.txt

@@ -0,0 +1,6 @@
+class SelfTest:
+    def __init__(self):
+        self.text = True
+
+    def method(self):
+        pass