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114 lines
2.3 KiB
Markdown
114 lines
2.3 KiB
Markdown
# napi
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This directory contains source for Deno's Node-API implementation. It depends on
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`napi_sym` and `deno_napi`.
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Files are generally organized the same as in Node.js's implementation to ease in
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ensuring compatibility.
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## Adding a new function
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Add the symbol name to
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[`cli/napi_sym/symbol_exports.json`](../napi_sym/symbol_exports.json).
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```diff
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{
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"symbols": [
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...
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"napi_get_undefined",
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- "napi_get_null"
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+ "napi_get_null",
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+ "napi_get_boolean"
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]
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}
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```
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Determine where to place the implementation. `napi_get_boolean` is related to JS
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values so we will place it in `js_native_api.rs`. If something is not clear,
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just create a new file module.
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See [`napi_sym`](../napi_sym/) for writing the implementation:
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```rust
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#[napi_sym::napi_sym]
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fn napi_get_boolean(
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env: *mut Env,
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value: bool,
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result: *mut napi_value,
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) -> Result {
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// ...
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Ok(())
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}
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```
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Update the generated symbol lists using the script:
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```
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deno run --allow-write tools/napi/generate_symbols_lists.js
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```
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Add a test in [`/tests/napi`](../../tests/napi/). You can also refer to Node.js
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test suite for Node-API.
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```js
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// tests/napi/boolean_test.js
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import { assertEquals, loadTestLibrary } from "./common.js";
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const lib = loadTestLibrary();
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Deno.test("napi get boolean", function () {
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assertEquals(lib.test_get_boolean(true), true);
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assertEquals(lib.test_get_boolean(false), false);
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});
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```
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```rust
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// tests/napi/src/boolean.rs
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use napi_sys::Status::napi_ok;
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use napi_sys::ValueType::napi_boolean;
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use napi_sys::*;
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extern "C" fn test_boolean(
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env: napi_env,
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info: napi_callback_info,
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) -> napi_value {
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let (args, argc, _) = crate::get_callback_info!(env, info, 1);
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assert_eq!(argc, 1);
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let mut ty = -1;
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assert!(unsafe { napi_typeof(env, args[0], &mut ty) } == napi_ok);
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assert_eq!(ty, napi_boolean);
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// Use napi_get_boolean here...
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value
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}
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pub fn init(env: napi_env, exports: napi_value) {
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let properties = &[crate::new_property!(env, "test_boolean\0", test_boolean)];
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unsafe {
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napi_define_properties(env, exports, properties.len(), properties.as_ptr())
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};
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}
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```
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```diff
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// tests/napi/src/lib.rs
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+ mod boolean;
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...
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#[no_mangle]
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unsafe extern "C" fn napi_register_module_v1(
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env: napi_env,
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exports: napi_value,
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) -> napi_value {
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...
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+ boolean::init(env, exports);
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exports
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}
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```
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Run the test using `cargo test -p tests/napi`.
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