OpenFAST, ROSCO & TurbSim Syntax Highlighting

Unofficial VS Code extension for OpenFAST, ROSCO, and TurbSim input and output files.

Features

• Syntax highlighting for OpenFAST-style text input files such as .fst, .dat, .in, .inp, .out, .ipt, .ech, .wnd, .sum, .bmi, and .lin
• Support for common OpenFAST module files including AeroDyn, ElastoDyn, HydroDyn, InflowWind, MoorDyn, ServoDyn, SeaState, and related driver files
• Support for ROSCO-style DISCON.in controller files
• Support for TurbSim input files (.inp, and .in)
• Highlighting for:
  • section banners and END markers
  • booleans and special values like default, unused, and none
  • quoted strings and file paths
  • integers, decimals, and scientific notation
  • parameter names in the common value parameter - description layout
  • ! comments and trailing inline descriptions

Installation

From the VS Code Marketplace (recommended):

1. Open VS Code.
2. Go to the Extensions view (Ctrl+Shift+X).
3. Search for OpenFAST ROSCO Syntax Highlighting.
4. Click Install.

From a .vsix file:

1. Download the .vsix file from the Releases page.
2. Open VS Code and go to the Extensions view (Ctrl+Shift+X).
3. Click the ... menu at the top right and select Install from VSIX....
4. Select the downloaded file.

Once installed, any file with a supported extension (.fst, .dat, .in, .inp, etc.) will be highlighted automatically.

Scope

The grammar is built from real OpenFAST, ROSCO, and TurbSim sample files, not from a generic INI or config grammar.

It is designed to make engineering input decks easier to read without trying to fully parse every module format.

Included Files

• syntaxes/openfast.tmLanguage.json
• language-configuration.json
• media/icon.png

Development

1. Install dependencies with npm install.
2. Run npm run test:grammar to check the TextMate grammar against representative sample lines.
3. Open this folder in Visual Studio Code.
4. Press F5 to launch an Extension Development Host.
5. Open an OpenFAST or ROSCO input file in the new window and verify highlighting.

Tests

The project includes a minimal grammar regression script in scripts/test-grammar.mjs.

• Test cases live in tests/grammar-cases.json
• Each case checks that a representative line tokenizes with the expected TextMate scope
• Add a new case whenever you fix a highlighting bug or add support for a new OpenFAST-family pattern

Run the checks with:

npm run test:grammar

Packaging

To package for sharing or publication:

1. Install dependencies with npm install
2. Run the grammar checks with npm run test:grammar
3. Run npm run package:vsix

Generated .vsix files are local build artifacts and should not be committed.

Notes

• Because .dat and .in are generic extensions, this extension may also match non-OpenFAST files if enabled globally.
• ROSCO YAML files are intentionally not claimed by this extension because standard YAML support in VS Code is usually the better default.