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The formatted output is structurally different from the input with `--verify-structure` (false positive)

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Issue 类型
缺陷
描述清晰度
基本清楚
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活跃
技术栈
rust
领域
tooling

调研方向

Start by locating the formatter’s parsing and line-breaking code, then trace how --verify-structure compares the input with formatted output. Reproduce the reported case with the two-line GDScript example and check whether backslash line continuations are treated consistently in both paths. Done means verification accepts the formatter’s output and unnecessary continuations are handled as described; the issue does not name specific files or tests.

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描述

I found a case where --verify-structure fails. I think it's a false positive.

$ gdscript-formatter example.gd --verify-structure
Formatting 1 file...Error: "Failed to format file example.gd: The formatted output is structurally different from the input. Please report this to the bug tracker with a copy of the input code: https://github.com/GDQuest/GDScript-formatter/issues/"

I stripped down the failing file to a minimal example with just the line that causes the issue:

func _process(_delta: float) -> void:
	unit.followTarget = unit.position.distance_to(unit.targetUnit.position) > Global.getAbility[abilityIdsPrioritized[0]].targetRange

Here is what it becomes after applying the formatting:

func _process(_delta: float) -> void:
	unit.followTarget = unit.position.distance_to(unit.targetUnit.position) > Global \
			.getAbility[abilityIdsPrioritized[0]] \
			.targetRange

I tested this formatted version and it still works.
The problem seems to be that the formatter is able to break long lines with \, but when parsing a file it does not recognize lines broken with \ as one line, so it thinks the file is now different.

That also means that the formatter does not put a line back together if it has unnecessary line breaks.
F.ex. if I do something weird like this (which is still the exact same code):

func _process(_delta: float) -> void:
	unit \
		.\
		followTarget = unit.position.distance_to(unit.targetUnit.position) > Global \
		.\
	getAbility[abilityIdsPrioritized[0]]\
	.targetRange

All the formatter does with it is add some indents. Ideally it should remove the unnecessary line breaks.

Suggestion

The formatter could as part of the format and --verify-structure operations start by replacing all \ line breaks with a whitespace.
Then it will be "blind" to whatever line breaks already exist and always consistently add the line breaks it deems necessary.
It could have an option to enable/disable.

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