Circom Language Support

Syntax highlighting, code snippets, and language configuration for the Circom 2.x zero-knowledge circuit language.

The first Circom extension available on Open VSX Registry - works with VSCodium, Eclipse Theia, and other open editors.

Features

Full TextMate grammar for Circom 2.x including:

Keywords: pragma, include, template, function, signal, var, component, bus
Modifiers: input, output, public, parallel, custom
Control flow: if, else, for, while, do, return
Constraint operators: <==, ==>, <--, -->, === (styled distinctly from standard operators)
Signal tags: {binary}, {maxbit} annotations
Component main: Special highlighting for component main {public [...]} = ...
Numeric literals: Decimal and hexadecimal (0xFF)
Comments: Line (//) and block (/* */)
Template/function calls: Capitalized identifiers recognized as template instantiations

28 snippets to accelerate Circom development:

Prefix	Description
`pragma`	Pragma version declaration
`include`	Include external circom file
`circomfile`	Full circom file boilerplate
`template`	Template declaration
`templatemain`	Template with component main
`templateparallel`	Parallel template declaration
`function`	Function declaration
`signalinput`	Input signal declaration
`signaloutput`	Output signal declaration
`signal`	Intermediate signal declaration
`signalinputtag`	Input signal with tag annotation
`component`	Component instantiation
`componentmain`	Main component declaration
`componentmainpublic`	Main component with public signals
`sca`	Signal constrain-assign `<==`
`scr`	Signal constrain-assign (right) `==>`
`sal`	Signal assign (no constraint) `<--`
`eqc`	Equality constraint `===`
`for`	For loop
`while`	While loop
`if`	If statement
`ifelse`	If-else statement
`log`	Log for debugging
`assert`	Assert statement
`vararray`	Variable array declaration
`var2d`	Variable 2D array declaration
`anon`	Anonymous component (Circom 2.1+)
`tuple`	Tuple destructuring assignment
`iszero`	Inline IsZero gadget pattern

Search for "Circom Language Support" in the extensions panel, or:

codium --install-extension darkartistry.circom-lang

Search for "Circom Language Support" in the extensions panel, or:

code --install-extension darkartistry.circom-lang

Download the .vsix from Releases, then:

codium --install-extension circom-lang-0.1.0.vsix
# or
code --install-extension circom-lang-0.1.0.vsix