Syntax Highlighting

The Noir JetBrains Plugin provides native syntax highlighting for .nr files. Highlighting works immediately without requiring LSP connection, making it reliable and fast.

Highlighted Elements

Keywords

Control flow and declaration keywords are highlighted:

fn main() {
    let x = 5;
    if x > 0 {
        for i in 0..10 {
            // loop body
        }
    } else {
        while true {
            break;
        }
    }
}

struct Point { x: Field, y: Field }
mod utils;
use std::hash;
pub fn public_func() {}

Keywords include: fn, let, mut, if, else, for, in, while, loop, match, return, break, continue, struct, impl, trait, mod, use, pub, crate, self, super, as, where, type, const, static, unsafe, async, await, dyn, move, ref, box

Types

Built-in types are highlighted with a distinct color:

fn types_example(
    a: Field,
    b: bool,
    c: u8,
    d: u16,
    e: u32,
    f: u64,
    g: i8,
    h: i32,
    i: str<32>,
) {}

Types include: Field, bool, u8, u16, u32, u64, u128, i8, i16, i32, i64, i128, str, Self

Strings

Multiple string types are supported:

fn string_examples() {
    // Regular strings
    let s1 = "Hello, world!";

    // Raw strings (no escape processing)
    let s2 = r#"Raw string with "quotes""#;
    let s3 = r##"Even more # symbols"##;

    // Format strings
    let name = "Alice";
    let s4 = f"Hello, {name}!";
}

Comments

Both line and block comments are highlighted:

// This is a line comment

/*
 * This is a block comment
 * It can span multiple lines
 */

fn example() {
    // Comments can appear anywhere
    let x = 5; // Including at end of lines

    /* Block comments /* can nest */ properly */
}

Numeric Literals

Decimal and hexadecimal numbers are highlighted:

fn numbers() {
    let decimal = 42;
    let hex = 0xDEADBEEF;
    let binary = 0b1010;
    let with_underscores = 1_000_000;
}

Attributes

Attributes (including test markers) are highlighted:

#[test]
fn test_something() {
    assert(true);
}

#[allow(unused)]
fn unused_function() {}

#[oracle(get_random)]
unconstrained fn get_random() -> Field {}

Boolean Literals

True and false are highlighted:

fn booleans() {
    let yes = true;
    let no = false;
}

Additional Editor Features

Comment Toggling

Use keyboard shortcuts to quickly toggle comments:

Line comment: Cmd+/ (macOS) or Ctrl+/ (Windows/Linux)
Block comment: Cmd+Shift+/ (macOS) or Ctrl+Shift+/ (Windows/Linux)

Bracket Matching

The plugin provides bracket matching for:

Curly braces: { }
Square brackets: [ ]
Parentheses: ( )

Click next to a bracket to highlight its matching pair. Double-click to select the content between brackets.

Color Customization

The plugin uses standard JetBrains color scheme keys, so your theme’s colors will apply automatically:

Element	Color Scheme Key
Keywords	`KEYWORD`
Types	`CLASS_NAME`
Strings	`STRING`
Numbers	`NUMBER`
Comments	`LINE_COMMENT`, `BLOCK_COMMENT`
Attributes	`METADATA`
Booleans	`KEYWORD`

To customize colors, go to Settings → Editor → Color Scheme → General and modify the relevant keys.