feat(corp/tvixbolt): check in initial tvixbolt version

This is the code backing the small site currently deployed at
https://tazj.in/blobs/nixbolt/index.html

This relies on a newer version of Tvix than is available in depot and
a bunch of other stuff that isn't public yet, so for now no build file
is provided as this is heavily work-in-progress.

Change-Id: I7a8e4dbf4e11d1c70175f929e65f40ff69acbbd9
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6315
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
This commit is contained in:
Vincent Ambo 2022-09-04 15:16:27 +03:00 committed by tazjin
parent f88d248f48
commit 8655440ae3
6 changed files with 862 additions and 0 deletions

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]

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[package]
name = "tvixbolt"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
yew = "0.19.3"
codemap = "0.1.3"
web-sys = "*"
[dependencies.rnix]
git = "https://github.com/nix-community/rnix-parser.git"
rev = "97b438e34be5211a4b48aeed9cc3ded489b4d6da"
[dependencies.tvix-eval]
path = "../tvix-eval/tvix/eval"
default-features = false
features = [ "disassembler" ]

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet"
href="https://unpkg.com/terminal.css@0.7.2/dist/terminal.min.css" />
<link data-trunk rel="inline" href="index.css">
<title>Tvixbolt</title>
</head>
</html>

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use std::{fmt::Write, rc::Rc};
use web_sys::HtmlTextAreaElement;
use yew::prelude::*;
use yew::TargetCast;
enum Msg {
CodeChange(String),
}
struct Model {
code: String,
}
impl Component for Model {
type Message = Msg;
type Properties = ();
fn create(_ctx: &Context<Self>) -> Self {
Self {
code: String::new(),
}
}
fn update(&mut self, _ctx: &Context<Self>, msg: Self::Message) -> bool {
match msg {
Msg::CodeChange(new_code) => {
self.code = new_code;
true
}
}
}
fn view(&self, ctx: &Context<Self>) -> Html {
// This gives us a component's "`Scope`" which allows us to send messages, etc to the component.
let link = ctx.link();
html! {
<div class="container">
<h1>{"tvixbolt"}</h1>
<form>
<fieldset>
<legend>{"Input"}</legend>
<div class="form-group">
<label for="code">{"Nix code:"}</label>
<textarea
oninput={link.callback(|e: InputEvent| {
let ta = e.target_unchecked_into::<HtmlTextAreaElement>().value();
Msg::CodeChange(ta)
})}
id="code" cols="30" rows="10">
</textarea>
</div>
<div class="form-group">
<label for="disable-bytecode">{"Disassemble:"}</label>
<input for="disable-bytecode" type="checkbox" checked=true disabled=true />
</div>
</fieldset>
</form>
<hr />
<h2>{"Result:"}</h2>
{eval(&self.code).display()}
</div>
}
}
}
#[derive(Default)]
struct Output {
parse_errors: String,
warnings: String,
compiler_errors: String,
runtime_errors: String,
output: String,
bytecode: Vec<u8>,
}
fn maybe_show(title: &str, s: &str) -> Html {
if s.is_empty() {
html! {}
} else {
html! {
<>
<h3>{title}</h3>
<pre>{s}</pre>
</>
}
}
}
impl Output {
fn display(self) -> Html {
html! {
<>
{maybe_show("Parse errors:", &self.parse_errors)}
{maybe_show("Warnings:", &self.warnings)}
{maybe_show("Compiler errors:", &self.compiler_errors)}
{maybe_show("Bytecode:", &String::from_utf8_lossy(&self.bytecode))}
{maybe_show("Runtime errors:", &self.runtime_errors)}
{maybe_show("Output:", &self.output)}
</>
}
}
}
fn eval(code: &str) -> Output {
let mut out = Output::default();
if code == "" {
return out;
}
let mut codemap = codemap::CodeMap::new();
let file = codemap.add_file("nixbolt".to_string(), code.into());
let parsed = rnix::ast::Root::parse(code);
let errors = parsed.errors();
if !errors.is_empty() {
for err in errors {
writeln!(&mut out.parse_errors, "parse error: {}", err).unwrap();
}
return out;
}
// If we've reached this point, there are no errors.
let root_expr = parsed
.tree()
.expr()
.expect("expression should exist if no errors occured");
let mut result = tvix_eval::compiler::compile(
root_expr,
Some("/nixbolt".into()),
&file,
tvix_eval::builtins::global_builtins(),
Rc::new(codemap),
)
.unwrap();
let lambda = Rc::new(result.lambda);
tvix_eval::disassembler::disassemble_lambda(&mut out.bytecode, lambda.clone());
out.bytecode.append(&mut result.output);
for warning in result.warnings {
writeln!(
&mut out.warnings,
"warning: {:?} at `{}` [line {}]",
warning.kind,
file.source_slice(warning.span),
file.find_line(warning.span.low()) + 1
)
.unwrap();
}
if !result.errors.is_empty() {
for error in &result.errors {
writeln!(
&mut out.compiler_errors,
"error: {:?} at `{}` [line {}]",
error.kind,
file.source_slice(error.span),
file.find_line(error.span.low()) + 1
)
.unwrap();
}
return out;
}
let result = tvix_eval::vm::run_lambda(lambda);
match result {
Ok(value) => writeln!(&mut out.output, "{}", value).unwrap(),
Err(err) => writeln!(&mut out.runtime_errors, "runtime error: {:?}", err).unwrap(),
};
out
}
fn main() {
yew::start_app::<Model>();
}