bindings/wasm: Add Database.prepare() and Statement.all()

This adds `Database.prepare()` and `Statement.all()` APIs to the Wasm
bindings so that you can actually get something useful out of the
library.

Cargo.lock

@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "addr2line"
@@ -1016,9 +1016,9 @@ checksum = "49f1f14873335454500d59611f1cf4a4b0f786f9ac11f4312a78e4cf2566695b"
 
 [[package]]
 name = "js-sys"
-version = "0.3.69"
+version = "0.3.72"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "29c15563dc2726973df627357ce0c9ddddbea194836909d655df6a75d2cf296d"
+checksum = "6a88f1bda2bd75b0452a14784937d796722fdebfe50df998aeb3f0b7603019a9"
 dependencies = [
  "wasm-bindgen",
 ]
@@ -1110,6 +1110,7 @@ name = "limbo-wasm"
 version = "0.0.4"
 dependencies = [
  "console_error_panic_hook",
+ "js-sys",
  "limbo_core",
  "wasm-bindgen",
 ]
@@ -2314,19 +2315,20 @@ checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
 
 [[package]]
 name = "wasm-bindgen"
-version = "0.2.92"
+version = "0.2.95"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4be2531df63900aeb2bca0daaaddec08491ee64ceecbee5076636a3b026795a8"
+checksum = "128d1e363af62632b8eb57219c8fd7877144af57558fb2ef0368d0087bddeb2e"
 dependencies = [
  "cfg-if",
+ "once_cell",
  "wasm-bindgen-macro",
 ]
 
 [[package]]
 name = "wasm-bindgen-backend"
-version = "0.2.92"
+version = "0.2.95"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "614d787b966d3989fa7bb98a654e369c762374fd3213d212cfc0251257e747da"
+checksum = "cb6dd4d3ca0ddffd1dd1c9c04f94b868c37ff5fac97c30b97cff2d74fce3a358"
 dependencies = [
  "bumpalo",
  "log",
@@ -2339,9 +2341,9 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-macro"
-version = "0.2.92"
+version = "0.2.95"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a1f8823de937b71b9460c0c34e25f3da88250760bec0ebac694b49997550d726"
+checksum = "e79384be7f8f5a9dd5d7167216f022090cf1f9ec128e6e6a482a2cb5c5422c56"
 dependencies = [
  "quote",
  "wasm-bindgen-macro-support",
@@ -2349,9 +2351,9 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-macro-support"
-version = "0.2.92"
+version = "0.2.95"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e94f17b526d0a461a191c78ea52bbce64071ed5c04c9ffe424dcb38f74171bb7"
+checksum = "26c6ab57572f7a24a4985830b120de1594465e5d500f24afe89e16b4e833ef68"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -2362,9 +2364,9 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-shared"
-version = "0.2.92"
+version = "0.2.95"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "af190c94f2773fdb3729c55b007a722abb5384da03bc0986df4c289bf5567e96"
+checksum = "65fc09f10666a9f147042251e0dda9c18f166ff7de300607007e96bdebc1068d"
 
 [[package]]
 name = "web-sys"

bindings/wasm/Cargo.toml

@@ -12,5 +12,6 @@ path = "lib.rs"
 
 [dependencies]
 console_error_panic_hook = "0.1.7"
+js-sys = "0.3.72"
 limbo_core = { path = "../../core", default-features = false }
 wasm-bindgen = "0.2"

bindings/wasm/examples/example.js

@@ -2,4 +2,8 @@ import { Database } from 'limbo-wasm';
 
 const db = new Database('hello.db');
 
-console.log(db.exec("SELECT 'hello, world' AS message"));
+const stmt = db.prepare('SELECT * FROM users');
+
+const users = stmt.all();
+
+console.log(users);

bindings/wasm/lib.rs

@@ -6,7 +6,8 @@ use wasm_bindgen::prelude::*;
 
 #[wasm_bindgen]
 pub struct Database {
-    _inner: Rc<limbo_core::Database>,
+    db: Rc<limbo_core::Database>,
+    conn: Rc<limbo_core::Connection>,
 }
 
 #[allow(clippy::arc_with_non_send_sync)]
@@ -18,12 +19,48 @@ impl Database {
         let file = io.open_file(path, limbo_core::OpenFlags::None).unwrap();
         let page_io = Rc::new(DatabaseStorage::new(file));
         let wal = Rc::new(RefCell::new(Wal {}));
-        let inner = limbo_core::Database::open(io, page_io, wal).unwrap();
-        Database { _inner: inner }
+        let db = limbo_core::Database::open(io, page_io, wal).unwrap();
+        let conn = db.connect();
+        Database { db, conn }
     }
 
     #[wasm_bindgen]
     pub fn exec(&self, _sql: &str) {}
+
+    #[wasm_bindgen]
+    pub fn prepare(&self, _sql: &str) -> Statement {
+        let stmt = self.conn.prepare(_sql).unwrap();
+        Statement {
+            inner: RefCell::new(stmt),
+        }
+    }
+}
+
+#[wasm_bindgen]
+pub struct Statement {
+    inner: RefCell<limbo_core::Statement>,
+}
+
+#[wasm_bindgen]
+impl Statement {
+    pub fn all(&self) -> js_sys::Array {
+        let array = js_sys::Array::new();
+        loop {
+            match self.inner.borrow_mut().step() {
+                Ok(limbo_core::RowResult::Row(row)) => {
+                    let row_array = js_sys::Array::new();
+                    for value in row.values {
+                        row_array.push(&JsValue::from_str(&value.to_string()));
+                    }
+                    array.push(&row_array);
+                }
+                Ok(limbo_core::RowResult::IO) => todo!(),
+                Ok(limbo_core::RowResult::Done) => break,
+                Err(e) => panic!("Error: {:?}", e),
+            }
+        }
+        array
+    }
 }
 
 pub struct File {
@@ -202,7 +239,7 @@ impl limbo_core::Wal for Wal {
     }
 
     fn should_checkpoint(&self) -> bool {
-        todo!()
+        false
     }
 
     fn append_frame(
@@ -224,7 +261,7 @@ impl limbo_core::Wal for Wal {
     }
 
     fn sync(&mut self) -> Result<limbo_core::CheckpointStatus> {
-        todo!()
+        Ok(limbo_core::CheckpointStatus::Done)
     }
 }