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const { copy, test } = Deno;
import { assertEquals } from "../testing/asserts.ts";
import { LimitedReader, MultiReader, StringReader } from "./readers.ts";
import { StringWriter } from "./writers.ts";
import { copyN } from "./ioutil.ts";
import { decode } from "../encoding/utf8.ts";
test("ioStringReader", async function (): Promise<void> {
const r = new StringReader("abcdef");
const res0 = await r.read(new Uint8Array(6));
assertEquals(res0, 6);
const res1 = await r.read(new Uint8Array(6));
assertEquals(res1, null);
});
test("ioStringReader", async function (): Promise<void> {
const r = new StringReader("abcdef");
const buf = new Uint8Array(3);
const res1 = await r.read(buf);
assertEquals(res1, 3);
assertEquals(decode(buf), "abc");
const res2 = await r.read(buf);
assertEquals(res2, 3);
assertEquals(decode(buf), "def");
const res3 = await r.read(buf);
assertEquals(res3, null);
assertEquals(decode(buf), "def");
});
test("ioMultiReader", async function (): Promise<void> {
const r = new MultiReader(new StringReader("abc"), new StringReader("def"));
const w = new StringWriter();
const n = await copyN(r, w, 4);
assertEquals(n, 4);
assertEquals(w.toString(), "abcd");
await copy(r, w);
assertEquals(w.toString(), "abcdef");
});
test("ioLimitedReader", async function (): Promise<void> {
let sr = new StringReader("abc");
let r = new LimitedReader(sr, 2);
let buffer = await Deno.readAll(r);
assertEquals(decode(buffer), "ab");
assertEquals(decode(await Deno.readAll(sr)), "c");
sr = new StringReader("abc");
r = new LimitedReader(sr, 3);
buffer = await Deno.readAll(r);
assertEquals(decode(buffer), "abc");
assertEquals((await Deno.readAll(r)).length, 0);
sr = new StringReader("abc");
r = new LimitedReader(sr, 4);
buffer = await Deno.readAll(r);
assertEquals(decode(buffer), "abc");
assertEquals((await Deno.readAll(r)).length, 0);
});
test("ioLimitedReader", async function (): Promise<void> {
const rb = new StringReader("abc");
const wb = new StringWriter();
await Deno.copy(new LimitedReader(rb, -1), wb);
assertEquals(wb.toString(), "");
});
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