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Add deno.truncate (#805)

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ztplz 2018-10-01 03:06:20 +08:00 • committed by Ryan Dahl
parent f51903f773
commit 062b22fe56
7 changed files with 147 additions and 0 deletions
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73
js/truncate_test.ts Normal file
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// Copyright 2018 the Deno authors. All rights reserved. MIT license.
import { testPerm, assertEqual } from "./test_util.ts";
import * as deno from "deno";
function readDataSync(name: string): string {
const data = deno.readFileSync(name);
const decoder = new TextDecoder("utf-8");
const text = decoder.decode(data);
return text;
}
async function readData(name: string): Promise<string> {
const data = await deno.readFile(name);
const decoder = new TextDecoder("utf-8");
const text = decoder.decode(data);
return text;
}
testPerm({ write: true }, function truncateSyncSuccess() {
const enc = new TextEncoder();
const d = enc.encode("Hello");
const filename = deno.makeTempDirSync() + "/test_truncateSync.txt";
deno.writeFileSync(filename, d);
deno.truncateSync(filename, 20);
let data = readDataSync(filename);
assertEqual(data.length, 20);
deno.truncateSync(filename, 5);
data = readDataSync(filename);
assertEqual(data.length, 5);
deno.truncateSync(filename, -5);
data = readDataSync(filename);
assertEqual(data.length, 0);
deno.removeSync(filename);
});
testPerm({ write: true }, async function truncateSuccess() {
const enc = new TextEncoder();
const d = enc.encode("Hello");
const filename = deno.makeTempDirSync() + "/test_truncate.txt";
await deno.writeFile(filename, d);
await deno.truncate(filename, 20);
let data = await readData(filename);
assertEqual(data.length, 20);
await deno.truncate(filename, 5);
data = await readData(filename);
assertEqual(data.length, 5);
await deno.truncate(filename, -5);
data = await readData(filename);
assertEqual(data.length, 0);
await deno.remove(filename);
});
testPerm({ write: false }, function truncateSyncPerm() {
let err;
try {
deno.mkdirSync("/test_truncateSyncPermission.txt");
} catch (e) {
err = e;
}
assertEqual(err.kind, deno.ErrorKind.PermissionDenied);
assertEqual(err.name, "PermissionDenied");
});
testPerm({ write: false }, async function truncatePerm() {
let err;
try {
await deno.mkdir("/test_truncatePermission.txt");
} catch (e) {
err = e;
}
assertEqual(err.kind, deno.ErrorKind.PermissionDenied);
assertEqual(err.name, "PermissionDenied");
});