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1 files changed, 28 insertions, 0 deletions

diff --git a/src/web/zc.js b/src/web/zc.js
new file mode 100644
index 0000000..4f14d3c
--- /dev/null
+++ b/src/web/zc.js
@@ -0,0 +1,28 @@
+// runs zc in a browser or in node: the microcore compiled to webassembly,
+// with the compiler genome inside. ZC.load(bytes) gives a machine, and
+// machine.run(source) compiles and runs a program the way `zy < file.zc` does,
+// returning what it printed. every run starts from a fresh instance.
+(function (root) {
+	async function load(wasm) {
+		if (typeof wasm === 'string') wasm = await (await fetch(wasm)).arrayBuffer();
+		const mod = await WebAssembly.compile(wasm);
+		return {
+			async run(source) {
+				let out = [], msg = [], mem;
+				const inst = await WebAssembly.instantiate(mod, {
+					env: { js_putc: c => { out.push(c); }, js_msg: c => { msg.push(c); } }
+				});
+				const x = inst.exports;
+				const bytes = new TextEncoder().encode(source);
+				if (bytes.length > x.wasm_input_cap()) throw new Error('program too long for the input buffer');
+				new Uint8Array(x.memory.buffer).set(bytes, x.wasm_input());
+				x.wasm_set_input(bytes.length);
+				const status = x.wasm_run();
+				const dec = new TextDecoder();
+				return { output: dec.decode(new Uint8Array(out)), messages: dec.decode(new Uint8Array(msg)), status };
+			}
+		};
+	}
+	const ZC = { load };
+	if (typeof module !== 'undefined' && module.exports) module.exports = ZC; else root.ZC = ZC;
+})(typeof self !== 'undefined' ? self : this);