sysml-style 0.3.3

SysML v2 textual notation style checker and formatter

sysml-style

SysML v2 textual notation style checker and formatter. Lints and auto-formats .sysml files using configurable rules.

Installation

pip install sysmlpy        # required dependency
pip install tomli           # optional — only needed on Python < 3.11 for pyproject.toml config

Then run from the project root:

python -m sysml_style --help

Or install the package in editable mode:

pip install -e .
sysml-style --help

Usage

sysml-style check  [OPTIONS] FILE [FILE ...]
sysml-style format [OPTIONS] FILE [FILE ...]

check — Lint files for style issues

sysml-style check uav.sysml
sysml-style check --ignore SML401,SML202 uav.sysml
sysml-style check --quiet uav.sysml

Issues are printed as:

file.sysml:3:5: SML101 expected spaces around '=' operator [fixable]

Exit code: 0 if no issues, 1 if issues found.

format — Auto-format files

sysml-style format uav.sysml        # rewrites in-place
sysml-style format --check uav.sysml  # exit 1 if would change (for CI)
sysml-style format --diff uav.sysml   # show unified diff, don't write
sysml-style format --quiet uav.sysml

Exit code: 0 if no changes, 1 if --check would reformat, 2 on parse errors.

Config

Create a [tool.sysml-style] section in your pyproject.toml:

[tool.sysml-style]
max_line_length = 120
indent_size = 4
ignore = ["SML401", "SML202"]
naming_convention = "strict"   # or "relaxed"

sysml-style walks up from the target file to find pyproject.toml. Use --config PATH to point to a specific file. Without a config file, sensible defaults are used.

Rules

SML1xx — Whitespace

Code	Rule	Fixable
SML101	Spaces around = operator	yes
SML102	No space before ;	yes
SML103	No trailing whitespace	yes
SML104	Indentation is a multiple of the detected unit (2/3/4 spaces)	no
SML105	Blank line between top-level definitions	yes
SML106	Space before {	yes

SML2xx — Naming

Code	Rule	Fixable
SML201	Definition names should be UpperCamelCase	no
SML202	Usage (feature) names should be lowerCamelCase	no
SML203	Port names should end with Port suffix	no
SML204	Avoid spaces in element names; use CamelCase ⚠️	no

In relaxed naming mode, single-quoted names like 'My Part' are allowed without case enforcement.

⚠️ SML204 is a warning-level rule. Some organizations use spaces in quoted names for readability. Add --ignore SML204 if this doesn't fit your workflow.

SML3xx — Structure

Code	Rule	Fixable
SML301	import/alias before definitions	no
SML302	Empty block body {} can be omitted	no
SML303	Filename matches outermost package name ⚠️	no
SML304	Usages should have a descriptive name (no anonymous usages)	no
SML305	import must have a visibility parameter (public/private/protected)	yes

⚠️ SML303 is a warning-level rule. Filename conventions vary across organizations — some use snake_case.sysml, others mirror the package name exactly. Add --ignore SML303 or set ignore = ["SML303"] in your config if the rule doesn't fit your workflow.

SML305 is fixable — the fix adds public before the import, which is the safest default visibility.

SML4xx — Idioms

Code	Rule	Fixable
SML401	Doc comment before element, not after ;	no
SML402	Use doc keyword for documentation comments	no