https://github.com/jarred-sumner/zig-javascriptcore
JavaScriptCore Zig example
https://github.com/jarred-sumner/zig-javascriptcore
Last synced: about 2 months ago
JSON representation
JavaScriptCore Zig example
- Host: GitHub
- URL: https://github.com/jarred-sumner/zig-javascriptcore
- Owner: Jarred-Sumner
- Created: 2021-05-25T21:43:44.000Z (about 4 years ago)
- Default Branch: master
- Last Pushed: 2021-05-25T21:44:41.000Z (about 4 years ago)
- Last Synced: 2025-04-17T10:58:36.374Z (about 2 months ago)
- Language: Zig
- Size: 1.95 KB
- Stars: 6
- Watchers: 2
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: readme.md
Awesome Lists containing this project
README
# zig-javascriptcore
Seeing how to get [JavaScriptCore](https://developer.apple.com/documentation/javascriptcore/c_javascriptcore_api) to run inside Zig. Only works on macOS because it links `JavascriptCore.framework`.
Run this:
```bash
ZIG_SYSTEM_LINKER_HACK=1 zig build
./zig-out/bin/jsc
```
It should output:
```bash
Hello from JavaScript inside Zig
```
V8 is more practical because it's cross-platform and what the existing ecosystem uses. However, the build system is very complicated and C++-only. The proper way to make V8 work from Zig is probably porting [rusty_v8](https://github.com/denoland/rusty_v8/tree/main/src), but that's a much larger project than linking a system framework.
Code looks like this (this is just `main.zig`):
```zig
const std = @import("std");
const testing = std.testing;
const js = @import("./JavascriptCore.zig");
var allocator = std.heap.c_allocator;
fn logFromJavascript(
ctx: js.JSContextRef,
function: js.JSObjectRef,
this: js.JSObjectRef,
argument_count: usize,
_arguments: [*c]const js.JSValueRef,
except: [*c]js.JSValueRef,
) callconv(.C) js.JSValueRef {
const args = _arguments[0..argument_count];
var input: js.JSStringRef = js.JSValueToStringCopy(ctx, args[0], null);
var buffer = allocator.alloc(u8, js.JSStringGetMaximumUTF8CStringSize(input)) catch unreachable;
defer allocator.free(buffer);
const string_length = js.JSStringGetUTF8CString(input, buffer.ptr, buffer.len);
const string = buffer[0..string_length];
var stdout = std.io.getStdOut();
stdout.writeAll(string) catch {};
return js.JSValueMakeUndefined(ctx);
}
export fn sayHello() void {
var context_group: js.JSContextGroupRef = js.JSContextGroupCreate();
var global_context: js.JSGlobalContextRef = js.JSGlobalContextCreateInGroup(context_group, null);
var global_object: js.JSObjectRef = js.JSContextGetGlobalObject(global_context);
var log_function_name: js.JSStringRef = js.JSStringCreateWithUTF8CString("log"[0.. :0]);
var function: js.JSObjectRef = js.JSObjectMakeFunctionWithCallback(global_context, log_function_name, logFromJavascript);
var log_call_statement: js.JSStringRef = js.JSStringCreateWithUTF8CString("log('Hello from JavaScript inside Zig');"[0.. :0]);
js.JSObjectSetProperty(global_context, global_object, log_function_name, function, js.kJSPropertyAttributeNone, null);
const ret = js.JSEvaluateScript(global_context, log_call_statement, null, null, 1, null);
js.JSGlobalContextRelease(global_context);
js.JSContextGroupRelease(context_group);
js.JSStringRelease(log_function_name);
js.JSStringRelease(log_call_statement);
}
pub fn main() anyerror!void {
sayHello();
}
test "basic add functionality" {
sayHello();
}
```