ManimCommunity
IndexError on long code blocks
Long code blocks cause an error in _gen_chars
When using large blocks of code, I experienced an issue where i could not get a string to be accepted, after a bit of experimenting, it seems that after a certain point, indexing breaks.
Expected behavior
indexing should not break
How to reproduce the issue
Code for reproducing the problem
from manim import *
inp_code = '''ccccccccccc
cccccc
cccccccccccccccccc
ccc
cccccccccccccc
cccccccccccccccccccccccc
ccccccccccccccccccc
ccccccccccccccccccccc
cccccccccccccccccccccccccc
ccccccccccccccccccccccccccccc
cccccccccccccc
cccccccccccccccccccccccc
ccccccccccccccccccccccccccc
ccccccccccccccccccccccccccc
cccccccccc
ccccccccccccccccccccccc
cccccccccccccc
cccccccccccccccc
cccccccccccc
cccccccccccccccccccccc
cccccccccccccccccccccccccccc
ccccccccccccccccc
cccccccccccccccccc
cccccccccccccccccccc
ccccccccccccccccccccccc
ccccccccccccccc
ccccccccccccccccccc
ccccccccccccccccccccc
cccccccccccccccccccc
cccccc
ccccccccc
ccccccc
cccccccc
cccccccc
cccccccccccccc
cccccccccccccccccccccccccc
cccccccccccccccccccccccccccc
ccccccccccccccccc
cccccccccc
ccccccccccccccc
cccccccccccccccccccccccccc
cccccccccccc
cccccccccccccccccccccc
cccccccccccccccccccccccccc
ccccccccccccccc
cccccccccccccc
cccccccccccccccccccccccccc
ccccccccccccccccccccccc
ccccccccccccccccccccccc
ccccc
cccccccccccccccccccccc
ccccccccccccccccccccccc
ccccccccccccc
cccccccccccccc
cccccccccccccccccccccccccc
cccccccccccccccccccccccc
cccccccccccccccccccccccc
ccccccccccccccc
cccccccccccccccccccccc
cccccccccccccccccccccc
cccccccccccc
ccccccccccccccccccccccc
ccccccccccccccccccc
ccccccccccccccccccc
cccccccccccccccccccccccccc
cccccccc
cccccccccccccccccccccc
cccccccccccccccccccccc
ccccccccccc
cccccccccccccccccccccccccccccc
ccccccccccccccccccccccccccc
cccccccccccccccccccccc
ccccccccccccccccccccccccccc
cccccccccccccccccccc
ccccccccccccccccccc
cccccccccccccccccccc
cccccccccccccc
ccccccccccccccccccccccc
cccccccccccccccc
cccccccccc
cccccccccc
cccccccccccccccccccccc
cccccccccccccccc
ccccccccccc
cccccccccccccccccccc
cccccccccccc
ccccccc
cccccccccccccccccccccccc
cccccccccccccccccc
ccccccccccccc
ccccccccccccccccccccccc
cccccccccccccccccccccccc
ccccccccccccccccccccccccc
ccccccccccccccccccccccc
cccccccccccc
ccccccccccccccccccccc
ccccccccccccccccccccc
ccccccccccccccccccccccccc
ccccccccccccccccccccc
cccccccccccccc
cccccccccccccc
ccccccccccccccccccccccccc
ccccccccc
cccccccccc
ccccccccc
ccccccccccccccccc
cccccccccccccccccccc
ccccccccccccccc
cccccccccccccc
ccccccccccccccccccccccc
ccccccccccccc
ccccccccccc
cccccccccccccccccccccccc
ccccc
cccccccccccccc
ccccccccccccccccccccccccc
cccccccccc
cccccccccccccccccccccccc
cccccccccccccccc
ccccccccccc
ccccccccccccccccccc
ccccccccccccccccccccc
c
'''
class Main(Scene):
def construct(self):
code_box = Code(code=inp_code,language="asm")
self.add(code_box)
Additional media files
none
Logs
Terminal output
Manim Community v0.18.1
+--------------------- Traceback (most recent call last) ---------------------+
| C:\tools\Manim\Lib\site-packages\manim\cli\render\commands.py:120 in render |
| |
| 117 try: |
| 118 with tempconfig({}): |
| 119 scene = SceneClass() |
| > 120 scene.render() |
| 121 except Exception: |
| 122 error_console.print_exception() |
| 123 sys.exit(1) |
| |
| C:\tools\Manim\Lib\site-packages\manim\scene\scene.py:229 in render |
| |
| 226 """ |
| 227 self.setup() |
| 228 try: |
| > 229 self.construct() |
| 230 except EndSceneEarlyException: |
| 231 pass |
| 232 except RerunSceneException as e: |
| |
| c:\Users\Jaden\Desktop\Rust_Projects\one-asm-vis\mvp.py:170 in construct |
| |
| 167 |
| 168 class Main(Scene): |
| 169 def construct(self): |
| > 170 code_box = Code(code=inp_code,language="asm") |
| 171 self.add(code_box) |
| 172 |
| |
| C:\tools\Manim\Lib\site-packages\manim\mobject\text\code_mobject.py:227 in |
| __init__ |
| |
| 224 self.background_color = self.html_string[strati + 12 : strati |
| 225 self._gen_code_json() |
| 226 |
| > 227 self.code = self._gen_colored_lines() |
| 228 if self.insert_line_no: |
| 229 self.line_numbers = self._gen_line_numbers() |
| 230 self.line_numbers.next_to(self.code, direction=LEFT, buff |
| |
| C:\tools\Manim\Lib\site-packages\manim\mobject\text\code_mobject.py:350 in |
| _gen_colored_lines |
| |
| 347 for word_index in range(self.code_json[line_no].__len__() |
| 348 line_str = line_str + self.code_json[line_no][word_in |
| 349 lines_text.append(self.tab_spaces[line_no] * "\t" + line_ |
| > 350 code = Paragraph( |
| 351 *list(lines_text), |
| 352 line_spacing=self.line_spacing, |
| 353 tab_width=self.tab_width, |
| |
| C:\tools\Manim\Lib\site-packages\manim\mobject\text\text_mobject.py:163 in |
| __init__ |
| |
| 160 super().__init__() |
| 161 |
| 162 lines_str = "\n".join(list(text)) |
| > 163 self.lines_text = Text(lines_str, line_spacing=line_spacing, |
| 164 lines_str_list = lines_str.split("\n") |
| 165 self.chars = self._gen_chars(lines_str_list) |
| 166 |
| |
| C:\tools\Manim\Lib\site-packages\manim\mobject\text\text_mobject.py:520 in |
| __init__ |
| |
| 517 ) |
| 518 self.text = text |
| 519 if self.disable_ligatures: |
| > 520 self.submobjects = [*self._gen_chars()] |
| 521 self.chars = self.get_group_class()(*self.submobjects) |
| 522 self.text = text_without_tabs.replace(" ", "").replace("\n", |
| 523 nppc = self.n_points_per_curve |
| |
| C:\tools\Manim\Lib\site-packages\manim\mobject\text\text_mobject.py:621 in |
| _gen_chars |
| |
| 618 ) |
| 619 chars.add(space) |
| 620 else: |
| > 621 chars.add(self.submobjects[submobjects_char_index]) |
| 622 submobjects_char_index += 1 |
| 623 return chars |
| 624 |
+-----------------------------------------------------------------------------+
IndexError: list index out of range
[19176] Execution returned code=1 in 2.075 seconds returned signal null
System specifications
System Details
- OS: Windows 11 (23H2)
- RAM: 64GB
- Python version: 3.11.9
- Installed modules:
click 8.1.7
cloup 3.0.5
colorama 0.4.6
decorator 5.1.1
glcontext 2.5.0
isosurfaces 0.1.2
manim 0.18.1
ManimPango 0.5.0
mapbox-earcut 1.0.1
markdown-it-py 3.0.0
mdurl 0.1.2
moderngl 5.10.0
moderngl-window 2.4.6
multipledispatch 1.0.0
networkx 3.3
numpy 1.26.4
pillow 10.3.0
pip 24.1.1
pycairo 1.26.1
pydub 0.25.1
pyglet 2.0.15
Pygments 2.18.0
pyrr 0.10.3
rich 13.7.1
scipy 1.14.0
screeninfo 0.8.1
setuptools 65.5.0
skia-pathops 0.8.0.post1
srt 3.5.3
svgelements 1.9.6
tqdm 4.66.4
typing_extensions 4.12.2
watchdog 4.0.1
wheel 0.43.0
LaTeX details
- LaTeX distribution (e.g. TeX Live 2020): ?
- Installed LaTeX packages: ?
Additional comments
I am unable to get details on latex, but this is a fresh install of manim community, so it should be whatever version / packages are included in the chocolaty package.
Line breaks and charracters seem to effect the indexing issue differently, but in the example code provided, removing the final c will let the script run.
The code object uses invisible characters for internal formatting. Have a look at this code piece which might help you: https://gist.github.com/abul4fia/b1e49ff695725c38e22969c8b8a0dc3e
You can try this workaround:
- Split your source code file into smaller files.
- Define a function to combine these files, dropping the SurroundingRectangle.
- Create your own SurroundingRectangle for the new code block.
def BuildLongCodeBlock(*source_files):
code_files = [Code(f, insert_line_no=False).code for f in source_files]
code_lines = VGroup(*code_files).arrange(direction=DOWN, aligned_edge=LEFT, buff=0.5).scale(0.3)
window = SurroundingRectangle(
code_lines,
color=WHITE,
fill_color=WHITE,
corner_radius=0.2,
buff=0.3,
stroke_width=1,
stroke_color=WHITE,
)
return VGroup(window, code_lines)
I have similar problems today
In the first time, I want to render a long TeX like the code. After making some changes(maybe removed \array{end}), the problem disappeared.
Then I changed tex_template.py, I met the same problems. I'm sure manim works well before changing it. Then I found I lost a line in _3b1b_preamble(\DisableLigatures{encoding = *, family = * }, which can not do the replacement in ctex), after adding it, manim works well again.
│ J:\Videos\manim\main.py:22 in construct │
│ │
│ 19 │
│ 20 class HelloLaTeX(Scene): │
│ 21 │ def construct(self): │
│ > 22 │ │ tex1 = Tex(r"柯西不等式知道吧", font_size=48, tex_template=TexTemplateLibrary.ct │
│ 23 │ │ tex2 = Tex( │
│ 24 │ │ │ r"$(a_1b_1+a_2b_2)^2\leq (a_1^2+a_2^2)(b_1^2+b_2^2)$", │
│ 25 │ │ │ font_size=48, tex_template=TexFontTemplates.latin_modern_tw │
│ │
│ C:\Python310\lib\site-packages\manim\mobject\text\tex_mobject.py:443 in __init__ │
│ │
│ 440 │ def __init__( │
│ 441 │ │ self, *tex_strings, arg_separator="", tex_environment="center", **kwargs │
│ 442 │ ): │
│ > 443 │ │ super().__init__( │
│ 444 │ │ │ *tex_strings, │
│ 445 │ │ │ arg_separator=arg_separator, │
│ 446 │ │ │ tex_environment=tex_environment, │
│ │
│ C:\Python310\lib\site-packages\manim\mobject\text\tex_mobject.py:278 in __init__ │
│ │
│ 275 │ │ │ │ tex_template=self.tex_template, │
│ 276 │ │ │ │ **kwargs, │
│ 277 │ │ │ ) │
│ > 278 │ │ │ self._break_up_by_substrings() │
│ 279 │ │ except ValueError as compilation_error: │
│ 280 │ │ │ if self.brace_notation_split_occurred: │
│ 281 │ │ │ │ logger.error( │
│ │
│ C:\Python310\lib\site-packages\manim\mobject\text\tex_mobject.py:348 in _break_up_by_substrings │
│ │
│ 345 │ │ │ ) │
│ 346 │ │ │ if num_submobs == 0: │
│ 347 │ │ │ │ last_submob_index = min(curr_index, len(self.submobjects) - 1) │
│ > 348 │ │ │ │ sub_tex_mob.move_to(self.submobjects[last_submob_index], RIGHT) │
│ 349 │ │ │ else: │
│ 350 │ │ │ │ sub_tex_mob.submobjects = self.submobjects[curr_index:new_index] │
│ 351 │ │ │ new_submobjects.append(sub_tex_mob) │
└──────────────────────────────────────────────────────────────────────────────────────────────────┘
IndexError: list index out of range
I have similar problems today In the first time, I want to render a long TeX like the code.
- Is this a new question or a comment about the proposed solution?
- Why are you referring to 3B1B's preamble when using ManimCE?
I have similar problems today In the first time, I want to render a long TeX like the code.
- Is this a new question or a comment about the proposed solution?
- Why are you referring to 3B1B's preamble when using ManimCE?
- It's a new question like this issue
- Well, I used ctex in
tex_templates.py, which includes 3B1B's preamble
If it is a new problem you will need to provide the exact code you used - nobody will be able to reproduce and diagnose your problem from the error messages alone.
Better yet, come over to Discord for discussions. https://docs.manim.community/en/stable/faq/general.html?highlight=discord#where-can-i-find-more-resources-for-learning-manim
This does not just happen on long code blocks, but also code blocks with ligatures if you are using a font with ligatures. The workaround I found is using a NL font (no ligature) instead of the regular version. E.g. JetBrainsMono -> JetBrainsMonoNL:
# type:ignore
from manim import *
class MyScene(Scene):
def construct(self):
c2 = Code(
code="""macro_rules! my_macro {
($wow : tt) => {
dbg!($wow);
};
}""",
language="rust",
style="gruvbox-light",
font="JetBrainsMonoNL Nerd Font",
)
self.add(c2)
self.wait(1)
