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Implement deno.readFile()

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As an example of how to implement ops that have both sync and async
versions.
This commit is contained in:
Ryan Dahl 2018-09-09 20:25:43 -04:00
parent c29392b25f
commit 35bc9ddf63
9 changed files with 100 additions and 79 deletions
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38
js/os.ts
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@ -126,37 +126,6 @@ export function mkdirSync(path: string, mode = 0o777): void {
sendSync(builder, fbs.Any.MkdirSync, msg);
}
/**
* Read the file.
* import { readFileSync } from "deno";
*
* const decoder = new TextDecoder("utf-8");
* const data = readFileSync("hello.txt");
* console.log(decoder.decode(data));
*/
export function readFileSync(filename: string): Uint8Array {
/* Ideally we could write
const res = sendSync({
command: fbs.Command.READ_FILE_SYNC,
readFileSyncFilename: filename
});
return res.readFileSyncData;
*/
const builder = new flatbuffers.Builder();
const filename_ = builder.createString(filename);
fbs.ReadFileSync.startReadFileSync(builder);
fbs.ReadFileSync.addFilename(builder, filename_);
const msg = fbs.ReadFileSync.endReadFileSync(builder);
const baseRes = sendSync(builder, fbs.Any.ReadFileSync, msg);
assert(baseRes != null);
assert(fbs.Any.ReadFileSyncRes === baseRes!.msgType());
const res = new fbs.ReadFileSyncRes();
assert(baseRes!.msg(res) != null);
const dataArray = res.dataArray();
assert(dataArray != null);
return new Uint8Array(dataArray!);
}
function createEnv(_msg: fbs.EnvironRes): { [index: string]: string } {
const env: { [index: string]: string } = {};
@ -365,13 +334,6 @@ export function writeFileSync(
* renameSync(oldpath, newpath);
*/
export function renameSync(oldpath: string, newpath: string): void {
/* Ideally we could write:
const res = sendSync({
command: fbs.Command.RENAME_SYNC,
renameOldPath: oldpath,
renameNewPath: newpath
});
*/
const builder = new flatbuffers.Builder();
const _oldpath = builder.createString(oldpath);
const _newpath = builder.createString(newpath);