add stub WASM plugin

Author: SillyFreak

.gitignore

@@ -0,0 +1 @@
+target/

Cargo.lock

@@ -0,0 +1,13 @@
+[workspace]
+resolver = "2"
+
+members = [
+	"plugin",
+]
+
+[profile.release]
+lto = true          # Enable link-time optimization
+strip = true        # Strip symbols from binary*
+opt-level = 'z'     # Optimize for size
+codegen-units = 1   # Reduce number of codegen units to increase optimizations
+panic = 'abort'     # Abort on panic

Cargo.toml

@@ -16,12 +16,18 @@ doc:
 
 # run test suite
 test *args:
+	cargo test
 	typst-test run {{ args }}
 
 # update test cases
 update *args:
 	typst-test update {{ args }}
 
+# build the parser WASM plugin
+plugin:
+	cargo build --release --target wasm32-unknown-unknown
+	cp target/wasm32-unknown-unknown/release/parser.wasm src/
+
 # package the library into the specified destination folder
 package target:
   ./scripts/package "{{target}}"

Justfile

@@ -0,0 +1,10 @@
+[package]
+name = "parser"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+wasm-minimal-protocol = "0.1.0"

plugin/Cargo.toml

@@ -0,0 +1,10 @@
+#[cfg(target_arch = "wasm32")]
+use wasm_minimal_protocol::wasm_func;
+
+#[cfg(target_arch = "wasm32")]
+wasm_minimal_protocol::initiate_protocol!();
+
+#[cfg_attr(target_arch = "wasm32", wasm_func)]
+pub fn concatenate(arg1: &[u8], arg2: &[u8]) -> Vec<u8> {
+    [arg1, arg2].concat()
+}

plugin/src/lib.rs

@@ -1,3 +1,6 @@
+#let _p = plugin("parser.wasm")
+
+
 /// The identity function
 ///
 /// #example(mode: "markup", ```typ
@@ -7,4 +10,9 @@
 ///
 /// - x (any): some parameter
 /// -> any
-#let id(x) = x
+#let id(x) = {
+  let foo = "foo"
+  let foofoo = str(_p.concatenate(bytes(foo), bytes(foo)))
+  assert.eq(foofoo, foo * 2)
+  x
+}