Sym File Extension

This extension adds language support and syntax highlighting for .sym symbol files.

What it does

• Associates .sym files with the sym language id.
• Adds basic editor pairs and ; line comments.
• Highlights bank/address prefixes, symbol and local labels, dotted directives, and directive parameters.

Customize the highlighting

Edit syntaxes/sym.tmLanguage.json if you want to refine the symbol-file rules further for edge cases in your toolchain.

Screenshot

Run the extension locally

1. Open this folder in VS Code.
2. Press F5 to launch an Extension Development Host.
3. Open or create a .sym file in the new window.