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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
import { FileOptions, isFileOptions, CallbackWithError } from "./_fs_common.ts";
import { notImplemented } from "../_utils.ts";
import { fromFileUrl } from "../path.ts";
/**
* TODO: Also accept 'data' parameter as a Node polyfill Buffer type once these
* are implemented. See https://github.com/denoland/deno/issues/3403
*/
export function appendFile(
pathOrRid: string | number | URL,
data: string,
optionsOrCallback: string | FileOptions | CallbackWithError,
callback?: CallbackWithError
): void {
pathOrRid = pathOrRid instanceof URL ? fromFileUrl(pathOrRid) : pathOrRid;
const callbackFn: CallbackWithError | undefined =
optionsOrCallback instanceof Function ? optionsOrCallback : callback;
const options: string | FileOptions | undefined =
optionsOrCallback instanceof Function ? undefined : optionsOrCallback;
if (!callbackFn) {
throw new Error("No callback function supplied");
}
validateEncoding(options);
let rid = -1;
const buffer: Uint8Array = new TextEncoder().encode(data);
new Promise((resolve, reject) => {
if (typeof pathOrRid === "number") {
rid = pathOrRid;
Deno.write(rid, buffer).then(resolve).catch(reject);
} else {
const mode: number | undefined = isFileOptions(options)
? options.mode
: undefined;
const flag: string | undefined = isFileOptions(options)
? options.flag
: undefined;
if (mode) {
//TODO rework once https://github.com/denoland/deno/issues/4017 completes
notImplemented("Deno does not yet support setting mode on create");
}
Deno.open(pathOrRid as string, getOpenOptions(flag))
.then(({ rid: openedFileRid }) => {
rid = openedFileRid;
return Deno.write(openedFileRid, buffer);
})
.then(resolve)
.catch(reject);
}
})
.then(() => {
closeRidIfNecessary(typeof pathOrRid === "string", rid);
callbackFn();
})
.catch((err) => {
closeRidIfNecessary(typeof pathOrRid === "string", rid);
callbackFn(err);
});
}
function closeRidIfNecessary(isPathString: boolean, rid: number): void {
if (isPathString && rid != -1) {
//Only close if a path was supplied and a rid allocated
Deno.close(rid);
}
}
/**
* TODO: Also accept 'data' parameter as a Node polyfill Buffer type once these
* are implemented. See https://github.com/denoland/deno/issues/3403
*/
export function appendFileSync(
pathOrRid: string | number | URL,
data: string,
options?: string | FileOptions
): void {
let rid = -1;
validateEncoding(options);
pathOrRid = pathOrRid instanceof URL ? fromFileUrl(pathOrRid) : pathOrRid;
try {
if (typeof pathOrRid === "number") {
rid = pathOrRid;
} else {
const mode: number | undefined = isFileOptions(options)
? options.mode
: undefined;
const flag: string | undefined = isFileOptions(options)
? options.flag
: undefined;
if (mode) {
// TODO rework once https://github.com/denoland/deno/issues/4017 completes
notImplemented("Deno does not yet support setting mode on create");
}
const file = Deno.openSync(pathOrRid, getOpenOptions(flag));
rid = file.rid;
}
const buffer: Uint8Array = new TextEncoder().encode(data);
Deno.writeSync(rid, buffer);
} finally {
closeRidIfNecessary(typeof pathOrRid === "string", rid);
}
}
function validateEncoding(
encodingOption: string | FileOptions | undefined
): void {
if (!encodingOption) return;
if (typeof encodingOption === "string") {
if (encodingOption !== "utf8") {
throw new Error("Only 'utf8' encoding is currently supported");
}
} else if (encodingOption.encoding && encodingOption.encoding !== "utf8") {
throw new Error("Only 'utf8' encoding is currently supported");
}
}
function getOpenOptions(flag: string | undefined): Deno.OpenOptions {
if (!flag) {
return { create: true, append: true };
}
let openOptions: Deno.OpenOptions;
switch (flag) {
case "a": {
// 'a': Open file for appending. The file is created if it does not exist.
openOptions = { create: true, append: true };
break;
}
case "ax": {
// 'ax': Like 'a' but fails if the path exists.
openOptions = { createNew: true, write: true, append: true };
break;
}
case "a+": {
// 'a+': Open file for reading and appending. The file is created if it does not exist.
openOptions = { read: true, create: true, append: true };
break;
}
case "ax+": {
// 'ax+': Like 'a+' but fails if the path exists.
openOptions = { read: true, createNew: true, append: true };
break;
}
case "r": {
// 'r': Open file for reading. An exception occurs if the file does not exist.
openOptions = { read: true };
break;
}
case "r+": {
// 'r+': Open file for reading and writing. An exception occurs if the file does not exist.
openOptions = { read: true, write: true };
break;
}
case "w": {
// 'w': Open file for writing. The file is created (if it does not exist) or truncated (if it exists).
openOptions = { create: true, write: true, truncate: true };
break;
}
case "wx": {
// 'wx': Like 'w' but fails if the path exists.
openOptions = { createNew: true, write: true };
break;
}
case "w+": {
// 'w+': Open file for reading and writing. The file is created (if it does not exist) or truncated (if it exists).
openOptions = { create: true, write: true, truncate: true, read: true };
break;
}
case "wx+": {
// 'wx+': Like 'w+' but fails if the path exists.
openOptions = { createNew: true, write: true, read: true };
break;
}
case "as": {
// 'as': Open file for appending in synchronous mode. The file is created if it does not exist.
openOptions = { create: true, append: true };
}
case "as+": {
// 'as+': Open file for reading and appending in synchronous mode. The file is created if it does not exist.
openOptions = { create: true, read: true, append: true };
}
case "rs+": {
// 'rs+': Open file for reading and writing in synchronous mode. Instructs the operating system to bypass the local file system cache.
openOptions = { create: true, read: true, write: true };
}
default: {
throw new Error(`Unrecognized file system flag: ${flag}`);
}
}
return openOptions;
}
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