Better parsing of color styles in CodeMobject (#4454)

* fixed problem: default value of color in styles in CodeMobject

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* added accidently removed test

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Update code_mobject.py

Code suggested by maejam

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Henrik Skov Midtiby <hemi@mmmi.sdu.dk>
Co-authored-by: Henrik Skov Midtiby <henrikmidtiby@gmail.com>

manim/mobject/text/code_mobject.py

@@ -6,6 +6,7 @@ __all__ = [
     "Code",
 ]
 
+import re
 from pathlib import Path
 from typing import Any, Literal
 
@@ -169,10 +170,10 @@ class Code(VMobject, metaclass=ConvertToOpenGL):
             if child.name == "span":
                 try:
                     child_style = child["style"]
-                    if isinstance(child_style, str):
-                        color = child_style.removeprefix("color: ")
-                    else:
-                        color = None
+                    match_ = re.match(
+                        r"color: (#[A-Fa-f0-9]{6}|#[A-Fa-f0-9]{3})", child_style
+                    )
+                    color = None if match_ is None else match_.group(1)
                 except KeyError:
                     color = None
                 current_line_color_ranges.append(

tests/test_code_mobject.py

@@ -1,4 +1,5 @@
 import numpy as np
+import pytest
 
 from manim.mobject.text.code_mobject import Code
 from manim.utils.color.core import ManimColor
@@ -45,3 +46,17 @@ for _ in range(42):
         rendered_code.code_lines[0].height,
         rendered_code.code_lines[2].height,
     )
+
+
+def test_code_initialization_style_correct_color():
+    for style in Code.get_styles_list():
+        try:
+            Code(
+                code_string="""# This is a comment.
+var = 3
+print(var)
+""",
+                formatter_style=style,
+            )
+        except ValueError as e:
+            pytest.fail(f"Code initialization failed for style {style} with error: {e}")