"Parser bug: Mismatched external parser" due to autoload path including unnecessary ./

[akien-mga]

Tested versions

• Reproducible in 4.3.beta (16f98cd)
• Reproducible in 4.3.dev4 to 4.3.beta2
• Not reproducible in 4.3.dev3 and earlier dev snapshots, or 4.2.2.stable

System information

Fedora Linux 40 (KDE Plasma) - Wayland - Vulkan (Forward+) - dedicated AMD Radeon RX 7600M XT (RADV NAVI33) - AMD Ryzen 7 7840HS w/ Radeon 780M Graphics (16 Threads)

Issue description

Copying @Glorax's report from #92233, which was another bug with similar symptoms.
But this one happens straight in the editor.

The Cogito project template raises a bunch of parser errors in 4.3.dev4 and later.

resolve_class_member: Parser bug: Mismatched external parser.
<C++ Error>    Condition "!parser_ref->get_parser()->has_class(p_class)" is true.
<C++ Source>   modules/gdscript/gdscript_analyzer.cpp:909 @ resolve_class_member()

Steps to reproduce

• Open Cogito project with zip linked below
• After initial import, restart
• See "Parser errors" on the main scene or when loading one of the demo scenes

Minimal reproduction project (MRP)

Not minimal, but triggers the error: Cogito-main.zip

Could be reduced further.

[akien-mga]

I bisected this to #87124, CC @rsubtil @godotengine/gdscript

I added some debug prints around the added simplify_path(), and indeed the reproduction project has some paths saved in scenes which are not "simple", and the mismatch seems to trigger this error.

script path before: res://addons/quick_audio/./Audio.gd
script path after: res://addons/quick_audio/Audio.gd
---
script path before: res://addons/quick_audio/Audio.gd
script path after: res://addons/quick_audio/Audio.gd
ERROR: Parser bug: Mismatched external parser.
   at: resolve_class_member (./modules/gdscript/gdscript_analyzer.cpp:909)
ERROR: Parser bug: Mismatched external parser.
   at: resolve_class_member (./modules/gdscript/gdscript_analyzer.cpp:909)
ERROR: Parser bug: Mismatched external parser.
   at: resolve_class_member (./modules/gdscript/gdscript_analyzer.cpp:909)

This seems to come from the autoload:

project.godot
25:Audio="*res://addons/quick_audio/./Audio.gd"

Removing the extra ./ from that line solves the issue in the linked project.

So that's a workaround for affected users, but the parser bug still needs to be addressed anyway.

[Glorax]

On my iMac, whenever I press the command key while the script editor is open, it immediately adds a number of "Parser bug: Mismatched external parser." errors to the output log. This also triggers when using Command + Tab.

The number of errors added to the log likely corresponds to the number of lines it takes issue with in the currently selected script.

[dalexeev]

MRP: autoload-path-mrp.zip

[Baptiste81]

It seems that it has been merged for 4.3-RC1 ?
If yes, i'm always having the problem. Cf screenshot.

[akien-mga]

Do you have autoloads with a non simplified path? If not, this would be a different bug, and we'd need a reproduction project to debug further.

[zaftnotameni]

Do you have autoloads with a non simplified path? If not, this would be a different bug, and we'd need a reproduction project to debug further.

what would qualify as a "non simplified path" ?

I'm also having this in 4.3rc1

ERROR: Parser bug: Mismatched external parser.
   at: (modules/gdscript/gdscript_analyzer.cpp:909)
ERROR: Parser bug: Mismatched external parser.
   at: (modules/gdscript/gdscript_analyzer.cpp:909)

[akien-mga]

See #94098 (comment)

You can just look in project.godot how the path to your autoloads look like.

But again, this bug was fixed, so most likely what you are both experiencing is an unrelated parser bug. It would be best that you each open an issue with a reproduction project.

[akien-mga]

And see #94244 for a still open known parser bug with this error message.