deno.land / std@0.91.0 / io / bufio_test.ts
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const encoder = new TextEncoder();
async function readBytes(buf: BufReader): Promise<string> { const b = new Uint8Array(1000); let nb = 0; while (true) { const c = await buf.readByte(); if (c === null) { break; // EOF } b[nb] = c; nb++; } const decoder = new TextDecoder(); return decoder.decode(b.subarray(0, nb));}
Deno.test("bufioReaderSimple", async function (): Promise<void> { const data = "hello world"; const b = new BufReader(new StringReader(data)); const s = await readBytes(b); assertEquals(s, data);});
interface ReadMaker { name: string; fn: (r: Deno.Reader) => Deno.Reader;}
const readMakers: ReadMaker[] = [ { name: "full", fn: (r): Deno.Reader => r }, { name: "byte", fn: (r): iotest.OneByteReader => new iotest.OneByteReader(r), }, { name: "half", fn: (r): iotest.HalfReader => new iotest.HalfReader(r) }, // TODO(bartlomieju): { name: "data+err", r => new iotest.DataErrReader(r) }, // { name: "timeout", fn: r => new iotest.TimeoutReader(r) },];
// Call read to accumulate the text of a fileasync function reads(buf: BufReader, m: number): Promise<string> { const b = new Uint8Array(1000); let nb = 0; while (true) { const result = await buf.read(b.subarray(nb, nb + m)); if (result === null) { break; } nb += result; } const decoder = new TextDecoder(); return decoder.decode(b.subarray(0, nb));}
interface NamedBufReader { name: string; fn: (r: BufReader) => Promise<string>;}
const bufreaders: NamedBufReader[] = [ { name: "1", fn: (b: BufReader): Promise<string> => reads(b, 1) }, { name: "2", fn: (b: BufReader): Promise<string> => reads(b, 2) }, { name: "3", fn: (b: BufReader): Promise<string> => reads(b, 3) }, { name: "4", fn: (b: BufReader): Promise<string> => reads(b, 4) }, { name: "5", fn: (b: BufReader): Promise<string> => reads(b, 5) }, { name: "7", fn: (b: BufReader): Promise<string> => reads(b, 7) }, { name: "bytes", fn: readBytes }, // { name: "lines", fn: readLines },];
const MIN_READ_BUFFER_SIZE = 16;const bufsizes: number[] = [ 0, MIN_READ_BUFFER_SIZE, 23, 32, 46, 64, 93, 128, 1024, 4096,];
Deno.test("bufioBufReader", async function (): Promise<void> { const texts = new Array<string>(31); let str = ""; let all = ""; for (let i = 0; i < texts.length - 1; i++) { texts[i] = str + "\n"; all += texts[i]; str += String.fromCharCode((i % 26) + 97); } texts[texts.length - 1] = all;
for (const text of texts) { for (const readmaker of readMakers) { for (const bufreader of bufreaders) { for (const bufsize of bufsizes) { const read = readmaker.fn(new StringReader(text)); const buf = new BufReader(read, bufsize); const s = await bufreader.fn(buf); const debugStr = `reader=${readmaker.name} ` + `fn=${bufreader.name} bufsize=${bufsize} want=${text} got=${s}`; assertEquals(s, text, debugStr); } } } }});
Deno.test("bufioBufferFull", async function (): Promise<void> { const longString = "And now, hello, world! It is the time for all good men to come to the" + " aid of their party"; const buf = new BufReader(new StringReader(longString), MIN_READ_BUFFER_SIZE); const decoder = new TextDecoder();
try { await buf.readSlice("!".charCodeAt(0)); fail("readSlice should throw"); } catch (err) { assert(err instanceof BufferFullError); assert(err.partial instanceof Uint8Array); assertEquals(decoder.decode(err.partial), "And now, hello, "); }
const line = await buf.readSlice("!".charCodeAt(0)); assert(line !== null); const actual = decoder.decode(line); assertEquals(actual, "world!");});
Deno.test("bufioReadString", async function (): Promise<void> { const string = "And now, hello world!"; const buf = new BufReader(new StringReader(string), MIN_READ_BUFFER_SIZE);
const line = await buf.readString(","); assert(line !== null); assertEquals(line, "And now,"); assertEquals(line.length, 8);
const line2 = await buf.readString(","); assert(line2 !== null); assertEquals(line2, " hello world!");
assertEquals(await buf.readString(","), null);
try { await buf.readString("deno");
fail("should throw"); } catch (err) { assert(err.message, "Delimiter should be a single character"); }});
const testInput = encoder.encode( "012\n345\n678\n9ab\ncde\nfgh\nijk\nlmn\nopq\nrst\nuvw\nxy",);const testInputrn = encoder.encode( "012\r\n345\r\n678\r\n9ab\r\ncde\r\nfgh\r\nijk\r\nlmn\r\nopq\r\nrst\r\n" + "uvw\r\nxy\r\n\n\r\n",);const testOutput = encoder.encode("0123456789abcdefghijklmnopqrstuvwxy");
// TestReader wraps a Uint8Array and returns reads of a specific length.class TestReader implements Deno.Reader { constructor(private data: Uint8Array, private stride: number) {}
read(buf: Uint8Array): Promise<number | null> { let nread = this.stride; if (nread > this.data.byteLength) { nread = this.data.byteLength; } if (nread > buf.byteLength) { nread = buf.byteLength; } if (nread === 0) { return Promise.resolve(null); } copy(this.data, buf as Uint8Array); this.data = this.data.subarray(nread); return Promise.resolve(nread); }}
async function testReadLine(input: Uint8Array): Promise<void> { for (let stride = 1; stride < 2; stride++) { let done = 0; const reader = new TestReader(input, stride); const l = new BufReader(reader, input.byteLength + 1); while (true) { const r = await l.readLine(); if (r === null) { break; } const { line, more } = r; assertEquals(more, false); // eslint-disable-next-line @typescript-eslint/restrict-plus-operands const want = testOutput.subarray(done, done + line.byteLength); assertEquals( line, want, `Bad line at stride ${stride}: want: ${want} got: ${line}`, ); done += line.byteLength; } assertEquals( done, testOutput.byteLength, `readLine didn't return everything: got: ${done}, ` + `want: ${testOutput} (stride: ${stride})`, ); }}
Deno.test("bufioReadLine", async function (): Promise<void> { await testReadLine(testInput); await testReadLine(testInputrn);});
Deno.test("bufioPeek", async function (): Promise<void> { const decoder = new TextDecoder(); const p = new Uint8Array(10); // string is 16 (minReadBufferSize) long. const buf = new BufReader( new StringReader("abcdefghijklmnop"), MIN_READ_BUFFER_SIZE, );
let actual = await buf.peek(1); assert(actual !== null); assertEquals(decoder.decode(actual), "a");
actual = await buf.peek(4); assert(actual !== null); assertEquals(decoder.decode(actual), "abcd");
try { await buf.peek(32); fail("peek() should throw"); } catch (err) { assert(err instanceof BufferFullError); assert(err.partial instanceof Uint8Array); assertEquals(decoder.decode(err.partial), "abcdefghijklmnop"); }
await buf.read(p.subarray(0, 3)); assertEquals(decoder.decode(p.subarray(0, 3)), "abc");
actual = await buf.peek(1); assert(actual !== null); assertEquals(decoder.decode(actual), "d");
actual = await buf.peek(1); assert(actual !== null); assertEquals(decoder.decode(actual), "d");
actual = await buf.peek(1); assert(actual !== null); assertEquals(decoder.decode(actual), "d");
actual = await buf.peek(2); assert(actual !== null); assertEquals(decoder.decode(actual), "de");
const res = await buf.read(p.subarray(0, 3)); assertEquals(decoder.decode(p.subarray(0, 3)), "def"); assert(res !== null);
actual = await buf.peek(4); assert(actual !== null); assertEquals(decoder.decode(actual), "ghij");
await buf.read(p); assertEquals(decoder.decode(p), "ghijklmnop");
actual = await buf.peek(0); assert(actual !== null); assertEquals(decoder.decode(actual), "");
const r = await buf.peek(1); assert(r === null); /* TODO Test for issue 3022, not exposing a reader's error on a successful Peek. buf = NewReaderSize(dataAndEOFReader("abcd"), 32) if s, err := buf.Peek(2); string(s) != "ab" || err != nil { t.Errorf(`Peek(2) on "abcd", EOF = %q, %v; want "ab", nil`, string(s), err) } if s, err := buf.Peek(4); string(s) != "abcd" || err != nil { t.Errorf( `Peek(4) on "abcd", EOF = %q, %v; want "abcd", nil`, string(s), err ) } if n, err := buf.Read(p[0:5]); string(p[0:n]) != "abcd" || err != nil { t.Fatalf("Read after peek = %q, %v; want abcd, EOF", p[0:n], err) } if n, err := buf.Read(p[0:1]); string(p[0:n]) != "" || err != io.EOF { t.Fatalf(`second Read after peek = %q, %v; want "", EOF`, p[0:n], err) } */});
Deno.test("bufioWriter", async function (): Promise<void> { const data = new Uint8Array(8192);
for (let i = 0; i < data.byteLength; i++) { // eslint-disable-next-line @typescript-eslint/restrict-plus-operands data[i] = " ".charCodeAt(0) + (i % ("~".charCodeAt(0) - " ".charCodeAt(0))); }
const w = new Deno.Buffer(); for (const nwrite of bufsizes) { for (const bs of bufsizes) { // Write nwrite bytes using buffer size bs. // Check that the right amount makes it out // and that the data is correct.
w.reset(); const buf = new BufWriter(w, bs);
const context = `nwrite=${nwrite} bufsize=${bs}`; const n = await buf.write(data.subarray(0, nwrite)); assertEquals(n, nwrite, context);
await buf.flush();
const written = w.bytes(); assertEquals(written.byteLength, nwrite);
for (let l = 0; l < written.byteLength; l++) { assertEquals(written[l], data[l]); } } }});
Deno.test("bufioWriterSync", function (): void { const data = new Uint8Array(8192);
for (let i = 0; i < data.byteLength; i++) { // eslint-disable-next-line @typescript-eslint/restrict-plus-operands data[i] = " ".charCodeAt(0) + (i % ("~".charCodeAt(0) - " ".charCodeAt(0))); }
const w = new Deno.Buffer(); for (const nwrite of bufsizes) { for (const bs of bufsizes) { // Write nwrite bytes using buffer size bs. // Check that the right amount makes it out // and that the data is correct.
w.reset(); const buf = new BufWriterSync(w, bs);
const context = `nwrite=${nwrite} bufsize=${bs}`; const n = buf.writeSync(data.subarray(0, nwrite)); assertEquals(n, nwrite, context);
buf.flush();
const written = w.bytes(); assertEquals(written.byteLength, nwrite);
for (let l = 0; l < written.byteLength; l++) { assertEquals(written[l], data[l]); } } }});
Deno.test("bufReaderReadFull", async function (): Promise<void> { const enc = new TextEncoder(); const dec = new TextDecoder(); const text = "Hello World"; const data = new Deno.Buffer(enc.encode(text)); const bufr = new BufReader(data, 3); { const buf = new Uint8Array(6); const r = await bufr.readFull(buf); assert(r !== null); assertEquals(r, buf); assertEquals(dec.decode(buf), "Hello "); } { const buf = new Uint8Array(6); try { await bufr.readFull(buf); fail("readFull() should throw PartialReadError"); } catch (err) { assert(err instanceof PartialReadError); assert(err.partial instanceof Uint8Array); assertEquals(err.partial.length, 5); assertEquals(dec.decode(buf.subarray(0, 5)), "World"); } }});
Deno.test("readStringDelimAndLines", async function (): Promise<void> { const enc = new TextEncoder(); const data = new Deno.Buffer( enc.encode("Hello World\tHello World 2\tHello World 3"), ); const chunks_ = [];
for await (const c of readStringDelim(data, "\t")) { chunks_.push(c); }
assertEquals(chunks_.length, 3); assertEquals(chunks_, ["Hello World", "Hello World 2", "Hello World 3"]);
const linesData = new Deno.Buffer(enc.encode("0\n1\n2\n3\n4\n5\n6\n7\n8\n9")); // consider data with windows newlines too const linesDataWindows = new Deno.Buffer( enc.encode("0\r\n1\r\n2\r\n3\r\n4\r\n5\r\n6\r\n7\r\n8\r\n9"), ); const lines_ = [];
for await (const l of readLines(linesData)) { lines_.push(l); }
assertEquals(lines_.length, 10); assertEquals(lines_, ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9"]);
// Now test for "windows" lines lines_.length = 0; for await (const l of readLines(linesDataWindows)) { lines_.push(l); } assertEquals(lines_.length, 10); assertEquals(lines_, ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9"]);});
Deno.test( "bufReaderShouldNotShareArrayBufferAcrossReads", async function (): Promise<void> { const decoder = new TextDecoder(); const data = "abcdefghijklmnopqrstuvwxyz"; const bufSize = 25; const b = new BufReader(new StringReader(data), bufSize);
const r1 = (await b.readLine()) as ReadLineResult; assert(r1 !== null); assertEquals(decoder.decode(r1.line), "abcdefghijklmnopqrstuvwxy");
const r2 = (await b.readLine()) as ReadLineResult; assert(r2 !== null); assertEquals(decoder.decode(r2.line), "z"); assert( r1.line.buffer !== r2.line.buffer, "array buffer should not be shared across reads", ); },);
Deno.test({ name: "Reset buffer after flush", async fn(): Promise<void> { const stringWriter = new StringWriter(); const bufWriter = new BufWriter(stringWriter); const encoder = new TextEncoder(); await bufWriter.write(encoder.encode("hello\nworld\nhow\nare\nyou?\n\n")); await bufWriter.flush(); await bufWriter.write(encoder.encode("foobar\n\n")); await bufWriter.flush(); const actual = stringWriter.toString(); assertEquals(actual, "hello\nworld\nhow\nare\nyou?\n\nfoobar\n\n"); },});
Deno.test({ name: "Reset buffer after flush sync", fn(): void { const stringWriter = new StringWriter(); const bufWriter = new BufWriterSync(stringWriter); const encoder = new TextEncoder(); bufWriter.writeSync(encoder.encode("hello\nworld\nhow\nare\nyou?\n\n")); bufWriter.flush(); bufWriter.writeSync(encoder.encode("foobar\n\n")); bufWriter.flush(); const actual = stringWriter.toString(); assertEquals(actual, "hello\nworld\nhow\nare\nyou?\n\nfoobar\n\n"); },});
Deno.test({ name: "BufWriter.flush should write all bytes", async fn(): Promise<void> { const bufSize = 16 * 1024; const data = new Uint8Array(bufSize); data.fill("a".charCodeAt(0));
const cache: Uint8Array[] = []; const writer: Deno.Writer = { write(p: Uint8Array): Promise<number> { cache.push(p.subarray(0, 1));
// Writer that only writes 1 byte at a time return Promise.resolve(1); }, };
const bufWriter = new BufWriter(writer); await bufWriter.write(data);
await bufWriter.flush(); const buf = new Uint8Array(cache.length); for (let i = 0; i < cache.length; i++) buf.set(cache[i], i);
assertEquals(data, buf); },});
Deno.test({ name: "BufWriterSync.flush should write all bytes", fn(): void { const bufSize = 16 * 1024; const data = new Uint8Array(bufSize); data.fill("a".charCodeAt(0));
const cache: Uint8Array[] = []; const writer: Deno.WriterSync = { writeSync(p: Uint8Array): number { cache.push(p.subarray(0, 1)); // Writer that only writes 1 byte at a time return 1; }, };
const bufWriter = new BufWriterSync(writer); bufWriter.writeSync(data);
bufWriter.flush(); const buf = new Uint8Array(cache.length); for (let i = 0; i < cache.length; i++) buf.set(cache[i], i);
assertEquals(data, buf); },});
std
Version Info
3 years ago
External Dependencies
No external dependencies 🎉
