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Fix up wasm-bindgen glue for POC #17

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Merged
merged 1 commit into from
Aug 29, 2025
Merged

Fix up wasm-bindgen glue for POC #17

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3 changes: 2 additions & 1 deletion crates/wasm-qmd-parser/pkg/index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,8 @@
import main from "./wasm_qmd_parser.js";
let m = await main();
debugger;
m.parse_qmd("# Hello");
let parsed = m.parse_qmd("# Hello\n");
console.log(parsed);
</script>
</head>
<body>
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42 changes: 37 additions & 5 deletions crates/wasm-qmd-parser/src/lib.rs
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Expand Up @@ -12,7 +12,7 @@ pub mod c_shim;

mod utils;

use std::io;
use std::{io, panic};

use quarto_markdown_pandoc::readers::qmd;
use quarto_markdown_pandoc::utils::output::VerboseOutput;
Expand All @@ -29,11 +29,43 @@ pub fn greet() {
alert("Hello, wasm-qmd-parser!");
}

#[wasm_bindgen(start)]
pub fn run() {
// Set a panic hook on program start that prints panics to the console
panic::set_hook(Box::new(console_error_panic_hook::hook));
}

#[wasm_bindgen]
pub fn parse_qmd(input: &str) -> String {
pub fn parse_qmd(input: JsValue) -> JsValue {
let mut output = VerboseOutput::Sink(io::sink());
let result = qmd::read(input.as_bytes(), &mut output).unwrap();

let input = match input.as_string() {
Some(input) => input,
None => panic!("Unable to parse `input` as a `String`."),
};

let result = match qmd::read(input.as_bytes(), &mut output) {
Ok(result) => result,
Err(err) => panic!("Unable to read as a qmd:\n{}", err.join("\n")),
};

let mut buf = Vec::new();
let _ = json::write(&result, &mut buf).unwrap();
String::from_utf8(buf).unwrap()

match json::write(&result, &mut buf) {
Ok(_) => {
// Nothing to do
}
Err(err) => {
panic!("Unable to write as json: {:?}", err)
}
}

let json = match String::from_utf8(buf) {
Ok(json) => json,
Err(err) => {
panic!("Unable to convert json to string: {:?}", err)
}
};

JsValue::from_str(&json)
}