docs.sheetjs.com/docz/static/cli/sheet2csv.rs

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Rust
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2023-05-23 06:28:14 +00:00
/* run code, get result as a Rust String */
fn eval_code(scope: &mut v8::HandleScope, code: &str) -> std::string::String {
let source = v8::String::new(scope, &code).unwrap();
let script = v8::Script::compile(scope, source, None).unwrap();
let result = script.run(scope).unwrap();
return result.to_string(scope).unwrap().to_rust_string_lossy(scope);
}
fn main() {
/* parse arguments */
let mut iter = std::env::args();
let path: String = iter.nth(1).expect("must specify a file name");
let sheetname: String = match iter.nth(0) {
Some(v) => format!("'{}'", v),
None => "wb.SheetNames[0]".to_string()
};
/* initialize */
let platform = v8::new_default_platform(0, false).make_shared();
v8::V8::initialize_platform(platform);
v8::V8::initialize();
/* read snapshot */
let startup_data: Vec<u8> = include_bytes!("./snapshot.bin").to_vec();
let params = v8::Isolate::create_params().snapshot_blob(startup_data);
let isolate = &mut v8::Isolate::new(params);
let handle_scope = &mut v8::HandleScope::new(isolate);
let context = v8::Context::new(handle_scope);
let context_scope = &mut v8::ContextScope::new(handle_scope, context);
/* read file */
let data: Vec<u8> = std::fs::read(path.clone()).unwrap();
let back: v8::UniqueRef<v8::BackingStore> = v8::ArrayBuffer::new_backing_store_from_vec(data);
let shared = back.make_shared();
let ab: v8::Local<v8::ArrayBuffer> = v8::ArrayBuffer::with_backing_store(context_scope, &shared);
let key = v8::String::new(context_scope, "buf").unwrap();
context.global(context_scope).set(context_scope, key.into(), ab.into());
/* print CSV of specified sheet */
let result = eval_code(context_scope, &mut format!("var wb = XLSX.read(buf, {{dense: true}}); XLSX.utils.sheet_to_csv(wb.Sheets[{}])", sheetname));
println!("{}", result);
}