1 files changed, 72 insertions, 0 deletions
diff --git a/worker/exec.mjs b/worker/exec.mjs
new file mode 100644
index 0000000..7d64cc3
--- /dev/null
+++ b/worker/exec.mjs
@@ -0,0 +1,72 @@
+import PHPWasm from "./php-wasm.js";
+
+process.once("message", async ({ code, input }) => {
+	const PRELUDE = `
+  define('STDIN', fopen('php://stdin', 'r'));
+  define('STDOUT', fopen('php://stdout', 'r'));
+  define('STDERR', fopen('php://stderr', 'r'));
+
+  `;
+	const BUFFER_MAX = 1024;
+
+	let stdinPos = 0; // bytewise
+	const stdinBuf = Buffer.from(input);
+	let stdoutPos = 0; // bytewise
+	const stdoutBuf = Buffer.alloc(BUFFER_MAX);
+	let stderrPos = 0; // bytewise
+	const stderrBuf = Buffer.alloc(BUFFER_MAX);
+
+	const { ccall } = await PHPWasm({
+		stdin: () => {
+			if (stdinBuf.length <= stdinPos) {
+				return null;
+			}
+			return stdinBuf.readUInt8(stdinPos++);
+		},
+		stdout: (asciiCode) => {
+			if (asciiCode === null) {
+				return; // flush
+			}
+			if (BUFFER_MAX <= stdoutPos) {
+				return; // ignore
+			}
+			stdoutBuf.writeUInt8(
+				asciiCode < 0 ? asciiCode + 256 : asciiCode,
+				stdoutPos++,
+			);
+		},
+		stderr: (asciiCode) => {
+			if (asciiCode === null) {
+				return; // flush
+			}
+			if (BUFFER_MAX <= stderrPos) {
+				return; // ignore
+			}
+			stderrBuf.writeUInt8(
+				asciiCode < 0 ? asciiCode + 256 : asciiCode,
+				stderrPos++,
+			);
+		},
+	});
+
+	let err;
+	let result;
+	try {
+		result = ccall("php_wasm_run", "number", ["string"], [PRELUDE + code]);
+	} catch (e) {
+		err = e;
+	}
+	if (err) {
+		process.send({
+			status: "runtime_error",
+			stdout: stdoutBuf.subarray(0, stdoutPos).toString(),
+			stderr: `${stderrBuf.subarray(0, stderrPos).toString()}\n${err.toString()}`,
+		});
+	} else {
+		process.send({
+			status: result === 0 ? "success" : "runtime_error",
+			stdout: stdoutBuf.subarray(0, stdoutPos).toString(),
+			stderr: stderrBuf.subarray(0, stderrPos).toString(),
+		});
+	}
+});