61 lines
2.5 KiB
Rust
61 lines
2.5 KiB
Rust
/* run code, get result as a Rust String */
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fn eval_code(scope: &mut v8::HandleScope, code: &str) -> std::string::String {
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let source = v8::String::new(scope, code).unwrap();
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let script = v8::Script::compile(scope, source, None).unwrap();
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let result = script.run(scope).unwrap();
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return result.to_string(scope).unwrap().to_rust_string_lossy(scope);
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}
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/* assuming JS code returns an ArrayBuffer, copy result to a Vec<u8> */
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fn eval_code_ab(scope: &mut v8::HandleScope, code: &str) -> Vec<u8> {
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let source = v8::String::new(scope, code).unwrap();
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let script = v8::Script::compile(scope, source, None).unwrap();
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let result: v8::Local<v8::ArrayBuffer> = script.run(scope).unwrap().try_into().unwrap();
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unsafe { return std::slice::from_raw_parts_mut(result.data().unwrap().cast::<u8>().as_ptr(), result.byte_length()).to_vec(); }
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}
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fn main() {
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/* parse arguments */
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let mut iter = std::env::args();
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let path: String = iter.nth(1).expect("must specify a file name");
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let sheetname: String = match iter.next() {
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Some(v) => format!("'{}'", v),
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None => "wb.SheetNames[0]".to_string()
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};
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/* initialize */
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let platform = v8::new_default_platform(0, false).make_shared();
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v8::V8::initialize_platform(platform);
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v8::V8::initialize();
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/* read snapshot */
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let startup_data: Vec<u8> = include_bytes!("./snapshot.bin").to_vec();
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let params = v8::Isolate::create_params().snapshot_blob(startup_data);
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let isolate = &mut v8::Isolate::new(params);
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let handle_scope = &mut v8::HandleScope::new(isolate);
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let context = v8::Context::new(handle_scope, Default::default());
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let context_scope = &mut v8::ContextScope::new(handle_scope, context);
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/* read file */
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{
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let data: Vec<u8> = std::fs::read(path.clone()).unwrap();
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let back: v8::UniqueRef<v8::BackingStore> = v8::ArrayBuffer::new_backing_store_from_vec(data);
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let shared = back.make_shared();
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let ab: v8::Local<v8::ArrayBuffer> = v8::ArrayBuffer::with_backing_store(context_scope, &shared);
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let key = v8::String::new(context_scope, "buf").unwrap();
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context.global(context_scope).set(context_scope, key.into(), ab.into());
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}
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/* print CSV of specified sheet */
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{
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let result = eval_code(context_scope, &format!("var wb = XLSX.read(buf, {{dense: true}}); XLSX.utils.sheet_to_csv(wb.Sheets[{}])", sheetname));
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println!("{}", result);
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}
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/* write sheetjsw.numbers */
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{
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let result = eval_code_ab(context_scope, "XLSX.write(wb, {type:'array', bookType:'numbers', numbers: XLSX_ZAHL_PAYLOAD})");
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std::fs::write("sheetjsw.numbers", result).unwrap();
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}
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}
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