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|
use std::fmt::Write;
use std::rc::Rc;
use tvix_eval::observer::DisassemblingObserver;
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.is_empty() {
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 codemap = Rc::new(codemap);
let mut compilation_observer = DisassemblingObserver::new(codemap, &mut out.bytecode);
let result = tvix_eval::compile(
root_expr,
Some("/nixbolt".into()),
&file,
tvix_eval::global_builtins(),
&mut compilation_observer,
)
.unwrap();
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::run_lambda(result.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>();
}
|
