tree-sitter-ucode

ucode grammar for tree-sitter.

This grammar provides parsing support for ucode, a lightweight scripting language used by OpenWrt with ECMAScript-like syntax. ucode is designed for system scripting, configuration management, and template processing in embedded Linux environments.

It was originally forked from tree-sitter-javascript and then modified to fit the needs of ucode.

Key Differences from JavaScript

This grammar is based on tree-sitter-javascript but removes features not supported in ucode:

• No classes: No ES6 classes, prototypes, or object-oriented programming constructs
• No this keyword: Functions don't have a this context
• No new operator: Cannot instantiate objects with constructors
• No arrow functions: Use function() {} syntax only
• No async/await: Synchronous execution only
• No generators: No function* or yield expressions
• No regex literals: Use match() and replace() functions instead of /pattern/flags
• No decorators or private fields: No @decorator or #privateField syntax

Supported Features

• Function declarations and expressions
• Variables (let, const, var)
• Control flow (if, for, while, switch, try/catch)
• Objects and arrays (with bracket notation for arrays only)
• Template literals with substitution
• Import/export statements (modern import and legacy require())
• Built-in function calls (print, json, jsonstr, etc.)

References

• ucode Documentation
• OpenWrt ucode