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import phpWasmBridgeUrl from "./php-wasm-bridge.js?url";
export type PHPExecResult = {
success: boolean;
stdout: string;
stderr: string;
};
const BUFFER_MAX = 1024;
let fetchingWasmBinaryPromise: Promise<ArrayBuffer> | null = null;
// Fetching is performed only once.
async function fetchWasmBinary(): Promise<ArrayBuffer> {
if (!fetchingWasmBinaryPromise) {
fetchingWasmBinaryPromise = new Promise((resolve, reject) => {
fetch("/php-wasm.wasm")
.then((res) => {
if (!res.ok) {
reject(`Failed to fetch wasm binary: ${res.status} (${res.url})`);
}
return res;
})
.then((res) => res.arrayBuffer())
.then((buf) => resolve(buf));
});
}
return fetchingWasmBinaryPromise;
}
export async function execPHP(code: string): Promise<PHPExecResult> {
let stdinPos = 0; // bytewise
const stdinBuf = new TextEncoder().encode(code);
let stdoutPos = 0; // bytewise
const stdoutBuf = new Uint8Array(BUFFER_MAX);
let stderrPos = 0; // bytewise
const stderrBuf = new Uint8Array(BUFFER_MAX);
const { default: PHPWasm } = await import(
/* @vite-ignore */ phpWasmBridgeUrl
);
const { ccall } = await PHPWasm({
wasmBinary: await fetchWasmBinary(),
stdin: () => {
if (stdinBuf.length <= stdinPos) {
return null;
}
return stdinBuf[stdinPos++];
},
stdout: (asciiCode: number | null) => {
if (asciiCode === null) {
return; // flush
}
if (BUFFER_MAX <= stdoutPos) {
return; // ignore
}
if (asciiCode < 0) {
asciiCode += 256;
}
stdoutBuf[stdoutPos++] = asciiCode;
},
stderr: (asciiCode: number | null) => {
if (asciiCode === null) {
return; // flush
}
if (BUFFER_MAX <= stderrPos) {
return; // ignore
}
if (asciiCode < 0) {
asciiCode += 256;
}
stderrBuf[stderrPos++] = asciiCode;
},
});
let result;
let extraError = null;
try {
result = ccall("php_wasm_run", "number", ["string"], [code]);
} catch (e) {
if (e instanceof WebAssembly.RuntimeError) {
extraError = e.message;
} else {
throw e;
}
}
const stdout = new TextDecoder().decode(stdoutBuf.subarray(0, stdoutPos));
const stderr = new TextDecoder().decode(stderrBuf.subarray(0, stderrPos));
return {
success: result === 0,
stdout,
stderr: extraError == null ? stderr : `${stderr}\n${extraError}`,
};
}
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