Jerry

Jerry for Zed

Features

Feature	Status
Syntax highlighting	✅
Bracket matching & auto-close	✅
Smart indentation	✅
Document outline / Go to Symbol	✅
Run button on `fn main()`	✅
Code snippets	✅
Diagnostics & type errors	Requires `jerry lsp` on `$PATH`
Go to definition	Requires `jerry lsp` on `$PATH`
Hover documentation	Requires `jerry lsp` on `$PATH`
Completions	Requires `jerry lsp` on `$PATH`

Installation

From the Zed extension registry: open Zed → ⌘⇧X → search Jerry → Install.

From source:

git clone https://github.com/jeffscottbrown/jerry-zed

Open Zed → ⌘⇧X → Install Dev Extension → select the cloned directory.

Language Server (jerry-lsp)

Full semantic features — diagnostics, completions, hover, go-to-definition — require the Jerry language server. Once jerry lsp is available on your $PATH, Zed will start it automatically when you open a .jer file. No further configuration is needed.

Snippets

Type a prefix and press Tab to expand.

Prefix	Expands to
`fn`	Function declaration
`fnx`	Anonymous function / closure
`class`	Class declaration with constructor
`classe`	Class declaration with inheritance
`let`	Typed variable declaration
`leti`	Variable declaration with inferred type
`if`	If statement
`ife`	If-else statement
`while`	While loop
`for`	Numeric for loop
`inc`	Include a stdlib module (`include @module`)
`incr`	Include a remote module
`print`	`print(value)`
`ret`	Return statement
`new`	New class instance

Language Basics

Jerry files use the .jer extension.

// Single-line comment

/* Block comment */

include @string   // stdlib module

class Animal {
    name: string;

    fn new(name: string) {
        this.name = name;
    }

    fn speak(): void {
        println("...");
    }
}

class Dog extends Animal {
    fn new(name: string) {
        this.name = name;
    }

    fn speak(): void {
        println("Woof! I am " + this.name);
    }
}

fn main(): void {
    let d = new Dog("Rex");
    d.speak();
}

Types

Keyword	Description
`int`	Integer
`float`	Floating-point number
`bool`	Boolean (`true` / `false`)
`string`	String
`void`	No return value

Built-in Functions

print · println · write · len · push · exit · panic · args · read_stdin · print_err · read_file · write_file · each_line · char_at · string_slice · char_to_string · int_to_string · float_to_string

Core stdlib (`include @core`)

int_abs · int_max · int_min · float_abs · float_max · float_min · bool_to_string

Contributing

Bug reports and pull requests welcome at https://github.com/jeffscottbrown/jerry-zed.