swc/crates/swc_bundler/tests/.cache/deno/62ed138e589be84029e6be44beffea908c99bd74.ts

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// Loaded from https://deno.land/std@0.77.0/io/bufio.ts
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
// Based on https://github.com/golang/go/blob/891682/src/bufio/bufio.go
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
type Reader = Deno.Reader;
type Writer = Deno.Writer;
type WriterSync = Deno.WriterSync;
import { copyBytes } from "../bytes/mod.ts";
import { assert } from "../_util/assert.ts";
const DEFAULT_BUF_SIZE = 4096;
const MIN_BUF_SIZE = 16;
const MAX_CONSECUTIVE_EMPTY_READS = 100;
const CR = "\r".charCodeAt(0);
const LF = "\n".charCodeAt(0);
export class BufferFullError extends Error {
name = "BufferFullError";
constructor(public partial: Uint8Array) {
super("Buffer full");
}
}
export class PartialReadError extends Deno.errors.UnexpectedEof {
name = "PartialReadError";
partial?: Uint8Array;
constructor() {
super("Encountered UnexpectedEof, data only partially read");
}
}
/** Result type returned by of BufReader.readLine(). */
export interface ReadLineResult {
line: Uint8Array;
more: boolean;
}
/** BufReader implements buffering for a Reader object. */
export class BufReader implements Reader {
private buf!: Uint8Array;
private rd!: Reader; // Reader provided by caller.
private r = 0; // buf read position.
private w = 0; // buf write position.
private eof = false;
// private lastByte: number;
// private lastCharSize: number;
/** return new BufReader unless r is BufReader */
static create(r: Reader, size: number = DEFAULT_BUF_SIZE): BufReader {
return r instanceof BufReader ? r : new BufReader(r, size);
}
constructor(rd: Reader, size: number = DEFAULT_BUF_SIZE) {
if (size < MIN_BUF_SIZE) {
size = MIN_BUF_SIZE;
}
this._reset(new Uint8Array(size), rd);
}
/** Returns the size of the underlying buffer in bytes. */
size(): number {
return this.buf.byteLength;
}
buffered(): number {
return this.w - this.r;
}
// Reads a new chunk into the buffer.
private async _fill(): Promise<void> {
// Slide existing data to beginning.
if (this.r > 0) {
this.buf.copyWithin(0, this.r, this.w);
this.w -= this.r;
this.r = 0;
}
if (this.w >= this.buf.byteLength) {
throw Error("bufio: tried to fill full buffer");
}
// Read new data: try a limited number of times.
for (let i = MAX_CONSECUTIVE_EMPTY_READS; i > 0; i--) {
const rr = await this.rd.read(this.buf.subarray(this.w));
if (rr === null) {
this.eof = true;
return;
}
assert(rr >= 0, "negative read");
this.w += rr;
if (rr > 0) {
return;
}
}
throw new Error(
`No progress after ${MAX_CONSECUTIVE_EMPTY_READS} read() calls`,
);
}
/** Discards any buffered data, resets all state, and switches
* the buffered reader to read from r.
*/
reset(r: Reader): void {
this._reset(this.buf, r);
}
private _reset(buf: Uint8Array, rd: Reader): void {
this.buf = buf;
this.rd = rd;
this.eof = false;
// this.lastByte = -1;
// this.lastCharSize = -1;
}
/** reads data into p.
* It returns the number of bytes read into p.
* The bytes are taken from at most one Read on the underlying Reader,
* hence n may be less than len(p).
* To read exactly len(p) bytes, use io.ReadFull(b, p).
*/
async read(p: Uint8Array): Promise<number | null> {
let rr: number | null = p.byteLength;
if (p.byteLength === 0) return rr;
if (this.r === this.w) {
if (p.byteLength >= this.buf.byteLength) {
// Large read, empty buffer.
// Read directly into p to avoid copy.
const rr = await this.rd.read(p);
const nread = rr ?? 0;
assert(nread >= 0, "negative read");
// if (rr.nread > 0) {
// this.lastByte = p[rr.nread - 1];
// this.lastCharSize = -1;
// }
return rr;
}
// One read.
// Do not use this.fill, which will loop.
this.r = 0;
this.w = 0;
rr = await this.rd.read(this.buf);
if (rr === 0 || rr === null) return rr;
assert(rr >= 0, "negative read");
this.w += rr;
}
// copy as much as we can
const copied = copyBytes(this.buf.subarray(this.r, this.w), p, 0);
this.r += copied;
// this.lastByte = this.buf[this.r - 1];
// this.lastCharSize = -1;
return copied;
}
/** reads exactly `p.length` bytes into `p`.
*
* If successful, `p` is returned.
*
* If the end of the underlying stream has been reached, and there are no more
* bytes available in the buffer, `readFull()` returns `null` instead.
*
* An error is thrown if some bytes could be read, but not enough to fill `p`
* entirely before the underlying stream reported an error or EOF. Any error
* thrown will have a `partial` property that indicates the slice of the
* buffer that has been successfully filled with data.
*
* Ported from https://golang.org/pkg/io/#ReadFull
*/
async readFull(p: Uint8Array): Promise<Uint8Array | null> {
let bytesRead = 0;
while (bytesRead < p.length) {
try {
const rr = await this.read(p.subarray(bytesRead));
if (rr === null) {
if (bytesRead === 0) {
return null;
} else {
throw new PartialReadError();
}
}
bytesRead += rr;
} catch (err) {
err.partial = p.subarray(0, bytesRead);
throw err;
}
}
return p;
}
/** Returns the next byte [0, 255] or `null`. */
async readByte(): Promise<number | null> {
while (this.r === this.w) {
if (this.eof) return null;
await this._fill(); // buffer is empty.
}
const c = this.buf[this.r];
this.r++;
// this.lastByte = c;
return c;
}
/** readString() reads until the first occurrence of delim in the input,
* returning a string containing the data up to and including the delimiter.
* If ReadString encounters an error before finding a delimiter,
* it returns the data read before the error and the error itself
* (often `null`).
* ReadString returns err != nil if and only if the returned data does not end
* in delim.
* For simple uses, a Scanner may be more convenient.
*/
async readString(delim: string): Promise<string | null> {
if (delim.length !== 1) {
throw new Error("Delimiter should be a single character");
}
const buffer = await this.readSlice(delim.charCodeAt(0));
if (buffer === null) return null;
return new TextDecoder().decode(buffer);
}
/** `readLine()` is a low-level line-reading primitive. Most callers should
* use `readString('\n')` instead or use a Scanner.
*
* `readLine()` tries to return a single line, not including the end-of-line
* bytes. If the line was too long for the buffer then `more` is set and the
* beginning of the line is returned. The rest of the line will be returned
* from future calls. `more` will be false when returning the last fragment
* of the line. The returned buffer is only valid until the next call to
* `readLine()`.
*
* The text returned from ReadLine does not include the line end ("\r\n" or
* "\n").
*
* When the end of the underlying stream is reached, the final bytes in the
* stream are returned. No indication or error is given if the input ends
* without a final line end. When there are no more trailing bytes to read,
* `readLine()` returns `null`.
*
* Calling `unreadByte()` after `readLine()` will always unread the last byte
* read (possibly a character belonging to the line end) even if that byte is
* not part of the line returned by `readLine()`.
*/
async readLine(): Promise<ReadLineResult | null> {
let line: Uint8Array | null;
try {
line = await this.readSlice(LF);
} catch (err) {
let { partial } = err;
assert(
partial instanceof Uint8Array,
"bufio: caught error from `readSlice()` without `partial` property",
);
// Don't throw if `readSlice()` failed with `BufferFullError`, instead we
// just return whatever is available and set the `more` flag.
if (!(err instanceof BufferFullError)) {
throw err;
}
// Handle the case where "\r\n" straddles the buffer.
if (
!this.eof &&
partial.byteLength > 0 &&
partial[partial.byteLength - 1] === CR
) {
// Put the '\r' back on buf and drop it from line.
// Let the next call to ReadLine check for "\r\n".
assert(this.r > 0, "bufio: tried to rewind past start of buffer");
this.r--;
partial = partial.subarray(0, partial.byteLength - 1);
}
return { line: partial, more: !this.eof };
}
if (line === null) {
return null;
}
if (line.byteLength === 0) {
return { line, more: false };
}
if (line[line.byteLength - 1] == LF) {
let drop = 1;
if (line.byteLength > 1 && line[line.byteLength - 2] === CR) {
drop = 2;
}
line = line.subarray(0, line.byteLength - drop);
}
return { line, more: false };
}
/** `readSlice()` reads until the first occurrence of `delim` in the input,
* returning a slice pointing at the bytes in the buffer. The bytes stop
* being valid at the next read.
*
* If `readSlice()` encounters an error before finding a delimiter, or the
* buffer fills without finding a delimiter, it throws an error with a
* `partial` property that contains the entire buffer.
*
* If `readSlice()` encounters the end of the underlying stream and there are
* any bytes left in the buffer, the rest of the buffer is returned. In other
* words, EOF is always treated as a delimiter. Once the buffer is empty,
* it returns `null`.
*
* Because the data returned from `readSlice()` will be overwritten by the
* next I/O operation, most clients should use `readString()` instead.
*/
async readSlice(delim: number): Promise<Uint8Array | null> {
let s = 0; // search start index
let slice: Uint8Array | undefined;
while (true) {
// Search buffer.
let i = this.buf.subarray(this.r + s, this.w).indexOf(delim);
if (i >= 0) {
i += s;
slice = this.buf.subarray(this.r, this.r + i + 1);
this.r += i + 1;
break;
}
// EOF?
if (this.eof) {
if (this.r === this.w) {
return null;
}
slice = this.buf.subarray(this.r, this.w);
this.r = this.w;
break;
}
// Buffer full?
if (this.buffered() >= this.buf.byteLength) {
this.r = this.w;
// #4521 The internal buffer should not be reused across reads because it causes corruption of data.
const oldbuf = this.buf;
const newbuf = this.buf.slice(0);
this.buf = newbuf;
throw new BufferFullError(oldbuf);
}
s = this.w - this.r; // do not rescan area we scanned before
// Buffer is not full.
try {
await this._fill();
} catch (err) {
err.partial = slice;
throw err;
}
}
// Handle last byte, if any.
// const i = slice.byteLength - 1;
// if (i >= 0) {
// this.lastByte = slice[i];
// this.lastCharSize = -1
// }
return slice;
}
/** `peek()` returns the next `n` bytes without advancing the reader. The
* bytes stop being valid at the next read call.
*
* When the end of the underlying stream is reached, but there are unread
* bytes left in the buffer, those bytes are returned. If there are no bytes
* left in the buffer, it returns `null`.
*
* If an error is encountered before `n` bytes are available, `peek()` throws
* an error with the `partial` property set to a slice of the buffer that
* contains the bytes that were available before the error occurred.
*/
async peek(n: number): Promise<Uint8Array | null> {
if (n < 0) {
throw Error("negative count");
}
let avail = this.w - this.r;
while (avail < n && avail < this.buf.byteLength && !this.eof) {
try {
await this._fill();
} catch (err) {
err.partial = this.buf.subarray(this.r, this.w);
throw err;
}
avail = this.w - this.r;
}
if (avail === 0 && this.eof) {
return null;
} else if (avail < n && this.eof) {
return this.buf.subarray(this.r, this.r + avail);
} else if (avail < n) {
throw new BufferFullError(this.buf.subarray(this.r, this.w));
}
return this.buf.subarray(this.r, this.r + n);
}
}
abstract class AbstractBufBase {
buf!: Uint8Array;
usedBufferBytes = 0;
err: Error | null = null;
/** Size returns the size of the underlying buffer in bytes. */
size(): number {
return this.buf.byteLength;
}
/** Returns how many bytes are unused in the buffer. */
available(): number {
return this.buf.byteLength - this.usedBufferBytes;
}
/** buffered returns the number of bytes that have been written into the
* current buffer.
*/
buffered(): number {
return this.usedBufferBytes;
}
}
/** BufWriter implements buffering for an deno.Writer object.
* If an error occurs writing to a Writer, no more data will be
* accepted and all subsequent writes, and flush(), will return the error.
* After all data has been written, the client should call the
* flush() method to guarantee all data has been forwarded to
* the underlying deno.Writer.
*/
export class BufWriter extends AbstractBufBase implements Writer {
/** return new BufWriter unless writer is BufWriter */
static create(writer: Writer, size: number = DEFAULT_BUF_SIZE): BufWriter {
return writer instanceof BufWriter ? writer : new BufWriter(writer, size);
}
constructor(private writer: Writer, size: number = DEFAULT_BUF_SIZE) {
super();
if (size <= 0) {
size = DEFAULT_BUF_SIZE;
}
this.buf = new Uint8Array(size);
}
/** Discards any unflushed buffered data, clears any error, and
* resets buffer to write its output to w.
*/
reset(w: Writer): void {
this.err = null;
this.usedBufferBytes = 0;
this.writer = w;
}
/** Flush writes any buffered data to the underlying io.Writer. */
async flush(): Promise<void> {
if (this.err !== null) throw this.err;
if (this.usedBufferBytes === 0) return;
try {
await Deno.writeAll(
this.writer,
this.buf.subarray(0, this.usedBufferBytes),
);
} catch (e) {
this.err = e;
throw e;
}
this.buf = new Uint8Array(this.buf.length);
this.usedBufferBytes = 0;
}
/** Writes the contents of `data` into the buffer. If the contents won't fully
* fit into the buffer, those bytes that can are copied into the buffer, the
* buffer is the flushed to the writer and the remaining bytes are copied into
* the now empty buffer.
*
* @return the number of bytes written to the buffer.
*/
async write(data: Uint8Array): Promise<number> {
if (this.err !== null) throw this.err;
if (data.length === 0) return 0;
let totalBytesWritten = 0;
let numBytesWritten = 0;
while (data.byteLength > this.available()) {
if (this.buffered() === 0) {
// Large write, empty buffer.
// Write directly from data to avoid copy.
try {
numBytesWritten = await this.writer.write(data);
} catch (e) {
this.err = e;
throw e;
}
} else {
numBytesWritten = copyBytes(data, this.buf, this.usedBufferBytes);
this.usedBufferBytes += numBytesWritten;
await this.flush();
}
totalBytesWritten += numBytesWritten;
data = data.subarray(numBytesWritten);
}
numBytesWritten = copyBytes(data, this.buf, this.usedBufferBytes);
this.usedBufferBytes += numBytesWritten;
totalBytesWritten += numBytesWritten;
return totalBytesWritten;
}
}
/** BufWriterSync implements buffering for a deno.WriterSync object.
* If an error occurs writing to a WriterSync, no more data will be
* accepted and all subsequent writes, and flush(), will return the error.
* After all data has been written, the client should call the
* flush() method to guarantee all data has been forwarded to
* the underlying deno.WriterSync.
*/
export class BufWriterSync extends AbstractBufBase implements WriterSync {
/** return new BufWriterSync unless writer is BufWriterSync */
static create(
writer: WriterSync,
size: number = DEFAULT_BUF_SIZE,
): BufWriterSync {
return writer instanceof BufWriterSync
? writer
: new BufWriterSync(writer, size);
}
constructor(private writer: WriterSync, size: number = DEFAULT_BUF_SIZE) {
super();
if (size <= 0) {
size = DEFAULT_BUF_SIZE;
}
this.buf = new Uint8Array(size);
}
/** Discards any unflushed buffered data, clears any error, and
* resets buffer to write its output to w.
*/
reset(w: WriterSync): void {
this.err = null;
this.usedBufferBytes = 0;
this.writer = w;
}
/** Flush writes any buffered data to the underlying io.WriterSync. */
flush(): void {
if (this.err !== null) throw this.err;
if (this.usedBufferBytes === 0) return;
try {
Deno.writeAllSync(
this.writer,
this.buf.subarray(0, this.usedBufferBytes),
);
} catch (e) {
this.err = e;
throw e;
}
this.buf = new Uint8Array(this.buf.length);
this.usedBufferBytes = 0;
}
/** Writes the contents of `data` into the buffer. If the contents won't fully
* fit into the buffer, those bytes that can are copied into the buffer, the
* buffer is the flushed to the writer and the remaining bytes are copied into
* the now empty buffer.
*
* @return the number of bytes written to the buffer.
*/
writeSync(data: Uint8Array): number {
if (this.err !== null) throw this.err;
if (data.length === 0) return 0;
let totalBytesWritten = 0;
let numBytesWritten = 0;
while (data.byteLength > this.available()) {
if (this.buffered() === 0) {
// Large write, empty buffer.
// Write directly from data to avoid copy.
try {
numBytesWritten = this.writer.writeSync(data);
} catch (e) {
this.err = e;
throw e;
}
} else {
numBytesWritten = copyBytes(data, this.buf, this.usedBufferBytes);
this.usedBufferBytes += numBytesWritten;
this.flush();
}
totalBytesWritten += numBytesWritten;
data = data.subarray(numBytesWritten);
}
numBytesWritten = copyBytes(data, this.buf, this.usedBufferBytes);
this.usedBufferBytes += numBytesWritten;
totalBytesWritten += numBytesWritten;
return totalBytesWritten;
}
}
/** Generate longest proper prefix which is also suffix array. */
function createLPS(pat: Uint8Array): Uint8Array {
const lps = new Uint8Array(pat.length);
lps[0] = 0;
let prefixEnd = 0;
let i = 1;
while (i < lps.length) {
if (pat[i] == pat[prefixEnd]) {
prefixEnd++;
lps[i] = prefixEnd;
i++;
} else if (prefixEnd === 0) {
lps[i] = 0;
i++;
} else {
prefixEnd = pat[prefixEnd - 1];
}
}
return lps;
}
/** Read delimited bytes from a Reader. */
export async function* readDelim(
reader: Reader,
delim: Uint8Array,
): AsyncIterableIterator<Uint8Array> {
// Avoid unicode problems
const delimLen = delim.length;
const delimLPS = createLPS(delim);
let inputBuffer = new Deno.Buffer();
const inspectArr = new Uint8Array(Math.max(1024, delimLen + 1));
// Modified KMP
let inspectIndex = 0;
let matchIndex = 0;
while (true) {
const result = await reader.read(inspectArr);
if (result === null) {
// Yield last chunk.
yield inputBuffer.bytes();
return;
}
if ((result as number) < 0) {
// Discard all remaining and silently fail.
return;
}
const sliceRead = inspectArr.subarray(0, result as number);
await Deno.writeAll(inputBuffer, sliceRead);
let sliceToProcess = inputBuffer.bytes();
while (inspectIndex < sliceToProcess.length) {
if (sliceToProcess[inspectIndex] === delim[matchIndex]) {
inspectIndex++;
matchIndex++;
if (matchIndex === delimLen) {
// Full match
const matchEnd = inspectIndex - delimLen;
const readyBytes = sliceToProcess.subarray(0, matchEnd);
// Copy
const pendingBytes = sliceToProcess.slice(inspectIndex);
yield readyBytes;
// Reset match, different from KMP.
sliceToProcess = pendingBytes;
inspectIndex = 0;
matchIndex = 0;
}
} else {
if (matchIndex === 0) {
inspectIndex++;
} else {
matchIndex = delimLPS[matchIndex - 1];
}
}
}
// Keep inspectIndex and matchIndex.
inputBuffer = new Deno.Buffer(sliceToProcess);
}
}
/** Read delimited strings from a Reader. */
export async function* readStringDelim(
reader: Reader,
delim: string,
): AsyncIterableIterator<string> {
const encoder = new TextEncoder();
const decoder = new TextDecoder();
for await (const chunk of readDelim(reader, encoder.encode(delim))) {
yield decoder.decode(chunk);
}
}
/** Read strings line-by-line from a Reader. */
// eslint-disable-next-line require-await
export async function* readLines(
reader: Reader,
): AsyncIterableIterator<string> {
yield* readStringDelim(reader, "\n");
}