Improper parsing of TOML

[NF-ada]

Hey,

I'm using pymarkdownlnt which uses this library to load the TOML configuration in the pyproject.toml. It incorrectly flags some strings as invalid TOML even though they aren't. Offending function is at:

application_properties/application_properties/application_properties.py

Line 444 in 97f810d

def __scan_map(self, config_map: Dict[Any, Any], current_prefix: str) -> None:

Sample pyproject.toml to reproduce it:

[tool.ruff]

lint.per-file-ignores."my_proj/logger.py" = [
  "ANN001", # No type check of logging functions needed
]

The specific issue stems from being to use paths which have a "." character but fails as it's an invalid character, as set in ApplicationProperties.

[TiepiNL]

I can confirm that the library incorrectly rejects TOML files containing quoted dictionary keys with period (.) characters, despite TOML v1.0.0 explicitly allowing ANY Unicode character in quoted keys.

TOML SPEC EVIDENCE

From https://toml.io/en/v1.0.0#keys:

"Quoted keys follow the exact same rules as either basic strings or
literal strings and allow you to use a much broader set of key names."

Example from spec that SHOULD work:

site."google.com" = true

This maps to JSON:

{ "site": { "google.com": true } }

ACTUAL BEHAVIOR

File: application_properties/application_properties.py
Line: 460, in __scan_map()

Raises: ValueError("Key strings cannot contain a whitespace character, 
                    a '=' character, or a '.' character.")

This validation is applied to ALL keys, including quoted keys, which violates the TOML specification.

REPRODUCTION

1. Create pyproject.toml with:

   [tool.ruff.lint.per-file-ignores]
   "build/scripts/utilities/file.py" = ["E501"]

2. Load with pymarkdown: pymarkdownlnt --config pyproject.toml scan .
3. Result: ValueError crash on the period in "file.py"

EXPECTED BEHAVIOR

Quoted keys should support ANY valid TOML string content, including:

• Periods: "file.py", "google.com", "127.0.0.1"
• Spaces: "character encoding"
• Equals signs (if escaped in basic strings)
• Any Unicode: "ʎǝʞ"

SUGGESTED FIX

The validation in __scan_map() should only apply to BARE keys, not quoted keys. Quoted keys should accept any content that's valid in a TOML quoted string.

WORKAROUND RUFF

A workaround for the ruff use case:

# workaround: replace periods with wildcards in file paths
[tool.ruff.lint.per-file-ignores]
"my_proj/logger*py" = [
  "ANN001", # No type check of logging functions needed
]