@zlooun/exceljs
Version:
Fixes the problem with writing a file using streams and not using RAM based on 'exeljs'
515 lines (502 loc) • 29.7 kB
JavaScript
"use strict";
function _regeneratorRuntime() { "use strict"; /*! regenerator-runtime -- Copyright (c) 2014-present, Facebook, Inc. -- license (MIT): https://github.com/facebook/regenerator/blob/main/LICENSE */ _regeneratorRuntime = function _regeneratorRuntime() { return exports; }; var exports = {}, Op = Object.prototype, hasOwn = Op.hasOwnProperty, defineProperty = Object.defineProperty || function (obj, key, desc) { obj[key] = desc.value; }, $Symbol = "function" == typeof Symbol ? Symbol : {}, iteratorSymbol = $Symbol.iterator || "@@iterator", asyncIteratorSymbol = $Symbol.asyncIterator || "@@asyncIterator", toStringTagSymbol = $Symbol.toStringTag || "@@toStringTag"; function define(obj, key, value) { return Object.defineProperty(obj, key, { value: value, enumerable: !0, configurable: !0, writable: !0 }), obj[key]; } try { define({}, ""); } catch (err) { define = function define(obj, key, value) { return obj[key] = value; }; } function wrap(innerFn, outerFn, self, tryLocsList) { var protoGenerator = outerFn && outerFn.prototype instanceof Generator ? outerFn : Generator, generator = Object.create(protoGenerator.prototype), context = new Context(tryLocsList || []); return defineProperty(generator, "_invoke", { value: makeInvokeMethod(innerFn, self, context) }), generator; } function tryCatch(fn, obj, arg) { try { return { type: "normal", arg: fn.call(obj, arg) }; } catch (err) { return { type: "throw", arg: err }; } } exports.wrap = wrap; var ContinueSentinel = {}; function Generator() {} function GeneratorFunction() {} function GeneratorFunctionPrototype() {} var IteratorPrototype = {}; define(IteratorPrototype, iteratorSymbol, function () { return this; }); var getProto = Object.getPrototypeOf, NativeIteratorPrototype = getProto && getProto(getProto(values([]))); NativeIteratorPrototype && NativeIteratorPrototype !== Op && hasOwn.call(NativeIteratorPrototype, iteratorSymbol) && (IteratorPrototype = NativeIteratorPrototype); var Gp = GeneratorFunctionPrototype.prototype = Generator.prototype = Object.create(IteratorPrototype); function defineIteratorMethods(prototype) { ["next", "throw", "return"].forEach(function (method) { define(prototype, method, function (arg) { return this._invoke(method, arg); }); }); } function AsyncIterator(generator, PromiseImpl) { function invoke(method, arg, resolve, reject) { var record = tryCatch(generator[method], generator, arg); if ("throw" !== record.type) { var result = record.arg, value = result.value; return value && "object" == _typeof(value) && hasOwn.call(value, "__await") ? PromiseImpl.resolve(value.__await).then(function (value) { invoke("next", value, resolve, reject); }, function (err) { invoke("throw", err, resolve, reject); }) : PromiseImpl.resolve(value).then(function (unwrapped) { result.value = unwrapped, resolve(result); }, function (error) { return invoke("throw", error, resolve, reject); }); } reject(record.arg); } var previousPromise; defineProperty(this, "_invoke", { value: function value(method, arg) { function callInvokeWithMethodAndArg() { return new PromiseImpl(function (resolve, reject) { invoke(method, arg, resolve, reject); }); } return previousPromise = previousPromise ? previousPromise.then(callInvokeWithMethodAndArg, callInvokeWithMethodAndArg) : callInvokeWithMethodAndArg(); } }); } function makeInvokeMethod(innerFn, self, context) { var state = "suspendedStart"; return function (method, arg) { if ("executing" === state) throw new Error("Generator is already running"); if ("completed" === state) { if ("throw" === method) throw arg; return doneResult(); } for (context.method = method, context.arg = arg;;) { var delegate = context.delegate; if (delegate) { var delegateResult = maybeInvokeDelegate(delegate, context); if (delegateResult) { if (delegateResult === ContinueSentinel) continue; return delegateResult; } } if ("next" === context.method) context.sent = context._sent = context.arg;else if ("throw" === context.method) { if ("suspendedStart" === state) throw state = "completed", context.arg; context.dispatchException(context.arg); } else "return" === context.method && context.abrupt("return", context.arg); state = "executing"; var record = tryCatch(innerFn, self, context); if ("normal" === record.type) { if (state = context.done ? "completed" : "suspendedYield", record.arg === ContinueSentinel) continue; return { value: record.arg, done: context.done }; } "throw" === record.type && (state = "completed", context.method = "throw", context.arg = record.arg); } }; } function maybeInvokeDelegate(delegate, context) { var methodName = context.method, method = delegate.iterator[methodName]; if (undefined === method) return context.delegate = null, "throw" === methodName && delegate.iterator.return && (context.method = "return", context.arg = undefined, maybeInvokeDelegate(delegate, context), "throw" === context.method) || "return" !== methodName && (context.method = "throw", context.arg = new TypeError("The iterator does not provide a '" + methodName + "' method")), ContinueSentinel; var record = tryCatch(method, delegate.iterator, context.arg); if ("throw" === record.type) return context.method = "throw", context.arg = record.arg, context.delegate = null, ContinueSentinel; var info = record.arg; return info ? info.done ? (context[delegate.resultName] = info.value, context.next = delegate.nextLoc, "return" !== context.method && (context.method = "next", context.arg = undefined), context.delegate = null, ContinueSentinel) : info : (context.method = "throw", context.arg = new TypeError("iterator result is not an object"), context.delegate = null, ContinueSentinel); } function pushTryEntry(locs) { var entry = { tryLoc: locs[0] }; 1 in locs && (entry.catchLoc = locs[1]), 2 in locs && (entry.finallyLoc = locs[2], entry.afterLoc = locs[3]), this.tryEntries.push(entry); } function resetTryEntry(entry) { var record = entry.completion || {}; record.type = "normal", delete record.arg, entry.completion = record; } function Context(tryLocsList) { this.tryEntries = [{ tryLoc: "root" }], tryLocsList.forEach(pushTryEntry, this), this.reset(!0); } function values(iterable) { if (iterable) { var iteratorMethod = iterable[iteratorSymbol]; if (iteratorMethod) return iteratorMethod.call(iterable); if ("function" == typeof iterable.next) return iterable; if (!isNaN(iterable.length)) { var i = -1, next = function next() { for (; ++i < iterable.length;) if (hasOwn.call(iterable, i)) return next.value = iterable[i], next.done = !1, next; return next.value = undefined, next.done = !0, next; }; return next.next = next; } } return { next: doneResult }; } function doneResult() { return { value: undefined, done: !0 }; } return GeneratorFunction.prototype = GeneratorFunctionPrototype, defineProperty(Gp, "constructor", { value: GeneratorFunctionPrototype, configurable: !0 }), defineProperty(GeneratorFunctionPrototype, "constructor", { value: GeneratorFunction, configurable: !0 }), GeneratorFunction.displayName = define(GeneratorFunctionPrototype, toStringTagSymbol, "GeneratorFunction"), exports.isGeneratorFunction = function (genFun) { var ctor = "function" == typeof genFun && genFun.constructor; return !!ctor && (ctor === GeneratorFunction || "GeneratorFunction" === (ctor.displayName || ctor.name)); }, exports.mark = function (genFun) { return Object.setPrototypeOf ? Object.setPrototypeOf(genFun, GeneratorFunctionPrototype) : (genFun.__proto__ = GeneratorFunctionPrototype, define(genFun, toStringTagSymbol, "GeneratorFunction")), genFun.prototype = Object.create(Gp), genFun; }, exports.awrap = function (arg) { return { __await: arg }; }, defineIteratorMethods(AsyncIterator.prototype), define(AsyncIterator.prototype, asyncIteratorSymbol, function () { return this; }), exports.AsyncIterator = AsyncIterator, exports.async = function (innerFn, outerFn, self, tryLocsList, PromiseImpl) { void 0 === PromiseImpl && (PromiseImpl = Promise); var iter = new AsyncIterator(wrap(innerFn, outerFn, self, tryLocsList), PromiseImpl); return exports.isGeneratorFunction(outerFn) ? iter : iter.next().then(function (result) { return result.done ? result.value : iter.next(); }); }, defineIteratorMethods(Gp), define(Gp, toStringTagSymbol, "Generator"), define(Gp, iteratorSymbol, function () { return this; }), define(Gp, "toString", function () { return "[object Generator]"; }), exports.keys = function (val) { var object = Object(val), keys = []; for (var key in object) keys.push(key); return keys.reverse(), function next() { for (; keys.length;) { var key = keys.pop(); if (key in object) return next.value = key, next.done = !1, next; } return next.done = !0, next; }; }, exports.values = values, Context.prototype = { constructor: Context, reset: function reset(skipTempReset) { if (this.prev = 0, this.next = 0, this.sent = this._sent = undefined, this.done = !1, this.delegate = null, this.method = "next", this.arg = undefined, this.tryEntries.forEach(resetTryEntry), !skipTempReset) for (var name in this) "t" === name.charAt(0) && hasOwn.call(this, name) && !isNaN(+name.slice(1)) && (this[name] = undefined); }, stop: function stop() { this.done = !0; var rootRecord = this.tryEntries[0].completion; if ("throw" === rootRecord.type) throw rootRecord.arg; return this.rval; }, dispatchException: function dispatchException(exception) { if (this.done) throw exception; var context = this; function handle(loc, caught) { return record.type = "throw", record.arg = exception, context.next = loc, caught && (context.method = "next", context.arg = undefined), !!caught; } for (var i = this.tryEntries.length - 1; i >= 0; --i) { var entry = this.tryEntries[i], record = entry.completion; if ("root" === entry.tryLoc) return handle("end"); if (entry.tryLoc <= this.prev) { var hasCatch = hasOwn.call(entry, "catchLoc"), hasFinally = hasOwn.call(entry, "finallyLoc"); if (hasCatch && hasFinally) { if (this.prev < entry.catchLoc) return handle(entry.catchLoc, !0); if (this.prev < entry.finallyLoc) return handle(entry.finallyLoc); } else if (hasCatch) { if (this.prev < entry.catchLoc) return handle(entry.catchLoc, !0); } else { if (!hasFinally) throw new Error("try statement without catch or finally"); if (this.prev < entry.finallyLoc) return handle(entry.finallyLoc); } } } }, abrupt: function abrupt(type, arg) { for (var i = this.tryEntries.length - 1; i >= 0; --i) { var entry = this.tryEntries[i]; if (entry.tryLoc <= this.prev && hasOwn.call(entry, "finallyLoc") && this.prev < entry.finallyLoc) { var finallyEntry = entry; break; } } finallyEntry && ("break" === type || "continue" === type) && finallyEntry.tryLoc <= arg && arg <= finallyEntry.finallyLoc && (finallyEntry = null); var record = finallyEntry ? finallyEntry.completion : {}; return record.type = type, record.arg = arg, finallyEntry ? (this.method = "next", this.next = finallyEntry.finallyLoc, ContinueSentinel) : this.complete(record); }, complete: function complete(record, afterLoc) { if ("throw" === record.type) throw record.arg; return "break" === record.type || "continue" === record.type ? this.next = record.arg : "return" === record.type ? (this.rval = this.arg = record.arg, this.method = "return", this.next = "end") : "normal" === record.type && afterLoc && (this.next = afterLoc), ContinueSentinel; }, finish: function finish(finallyLoc) { for (var i = this.tryEntries.length - 1; i >= 0; --i) { var entry = this.tryEntries[i]; if (entry.finallyLoc === finallyLoc) return this.complete(entry.completion, entry.afterLoc), resetTryEntry(entry), ContinueSentinel; } }, catch: function _catch(tryLoc) { for (var i = this.tryEntries.length - 1; i >= 0; --i) { var entry = this.tryEntries[i]; if (entry.tryLoc === tryLoc) { var record = entry.completion; if ("throw" === record.type) { var thrown = record.arg; resetTryEntry(entry); } return thrown; } } throw new Error("illegal catch attempt"); }, delegateYield: function delegateYield(iterable, resultName, nextLoc) { return this.delegate = { iterator: values(iterable), resultName: resultName, nextLoc: nextLoc }, "next" === this.method && (this.arg = undefined), ContinueSentinel; } }, exports; }
function asyncGeneratorStep(gen, resolve, reject, _next, _throw, key, arg) { try { var info = gen[key](arg); var value = info.value; } catch (error) { reject(error); return; } if (info.done) { resolve(value); } else { Promise.resolve(value).then(_next, _throw); } }
function _asyncToGenerator(fn) { return function () { var self = this, args = arguments; return new Promise(function (resolve, reject) { var gen = fn.apply(self, args); function _next(value) { asyncGeneratorStep(gen, resolve, reject, _next, _throw, "next", value); } function _throw(err) { asyncGeneratorStep(gen, resolve, reject, _next, _throw, "throw", err); } _next(undefined); }); }; }
function _typeof(obj) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (obj) { return typeof obj; } : function (obj) { return obj && "function" == typeof Symbol && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }, _typeof(obj); }
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, _toPropertyKey(descriptor.key), descriptor); } }
function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }
function _toPropertyKey(arg) { var key = _toPrimitive(arg, "string"); return _typeof(key) === "symbol" ? key : String(key); }
function _toPrimitive(input, hint) { if (_typeof(input) !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (_typeof(res) !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
/* eslint-disable max-classes-per-file */
var Stream = require('readable-stream');
var utils = require('./utils');
var StringBuf = require('./string-buf');
// =============================================================================
// data chunks - encapsulating incoming data
var StringChunk = /*#__PURE__*/function () {
function StringChunk(data, encoding) {
_classCallCheck(this, StringChunk);
this._data = data;
this._encoding = encoding;
}
_createClass(StringChunk, [{
key: "length",
get: function get() {
return this.toBuffer().length;
}
// copy to target buffer
}, {
key: "copy",
value: function copy(target, targetOffset, offset, length) {
return this.toBuffer().copy(target, targetOffset, offset, length);
}
}, {
key: "toBuffer",
value: function toBuffer() {
if (!this._buffer) {
this._buffer = Buffer.from(this._data, this._encoding);
}
return this._buffer;
}
}]);
return StringChunk;
}();
var StringBufChunk = /*#__PURE__*/function () {
function StringBufChunk(data) {
_classCallCheck(this, StringBufChunk);
this._data = data;
}
_createClass(StringBufChunk, [{
key: "length",
get: function get() {
return this._data.length;
}
// copy to target buffer
}, {
key: "copy",
value: function copy(target, targetOffset, offset, length) {
// eslint-disable-next-line no-underscore-dangle
return this._data._buf.copy(target, targetOffset, offset, length);
}
}, {
key: "toBuffer",
value: function toBuffer() {
return this._data.toBuffer();
}
}]);
return StringBufChunk;
}();
var BufferChunk = /*#__PURE__*/function () {
function BufferChunk(data) {
_classCallCheck(this, BufferChunk);
this._data = data;
}
_createClass(BufferChunk, [{
key: "length",
get: function get() {
return this._data.length;
}
// copy to target buffer
}, {
key: "copy",
value: function copy(target, targetOffset, offset, length) {
this._data.copy(target, targetOffset, offset, length);
}
}, {
key: "toBuffer",
value: function toBuffer() {
return this._data;
}
}]);
return BufferChunk;
}(); // =============================================================================
// ReadWriteBuf - a single buffer supporting simple read-write
var ReadWriteBuf = /*#__PURE__*/function () {
function ReadWriteBuf(size) {
_classCallCheck(this, ReadWriteBuf);
this.size = size;
// the buffer
this.buffer = Buffer.alloc(size);
// read index
this.iRead = 0;
// write index
this.iWrite = 0;
}
_createClass(ReadWriteBuf, [{
key: "toBuffer",
value: function toBuffer() {
if (this.iRead === 0 && this.iWrite === this.size) {
return this.buffer;
}
var buf = Buffer.alloc(this.iWrite - this.iRead);
this.buffer.copy(buf, 0, this.iRead, this.iWrite);
return buf;
}
}, {
key: "length",
get: function get() {
return this.iWrite - this.iRead;
}
}, {
key: "eod",
get: function get() {
return this.iRead === this.iWrite;
}
}, {
key: "full",
get: function get() {
return this.iWrite === this.size;
}
}, {
key: "read",
value: function read(size) {
var buf;
// read size bytes from buffer and return buffer
if (size === 0) {
// special case - return null if no data requested
return null;
}
if (size === undefined || size >= this.length) {
// if no size specified or size is at least what we have then return all of the bytes
buf = this.toBuffer();
this.iRead = this.iWrite;
return buf;
}
// otherwise return a chunk
buf = Buffer.alloc(size);
this.buffer.copy(buf, 0, this.iRead, size);
this.iRead += size;
return buf;
}
}, {
key: "write",
value: function write(chunk, offset, length) {
// write as many bytes from data from optional source offset
// and return number of bytes written
var size = Math.min(length, this.size - this.iWrite);
chunk.copy(this.buffer, this.iWrite, offset, offset + size);
this.iWrite += size;
return size;
}
}]);
return ReadWriteBuf;
}(); // =============================================================================
// StreamBuf - a multi-purpose read-write stream
// As MemBuf - write as much data as you like. Then call toBuffer() to consolidate
// As StreamHub - pipe to multiple writables
// As readable stream - feed data into the writable part and have some other code read from it.
// Note: Not sure why but StreamBuf does not like JS "class" sugar. It fails the
// integration tests
var StreamBuf = function StreamBuf(options) {
options = options || {};
this.bufSize = options.bufSize || 1024 * 1024;
this.buffers = [];
// batch mode fills a buffer completely before passing the data on
// to pipes or 'readable' event listeners
this.batch = options.batch || false;
this.corked = false;
// where in the current writable buffer we're up to
this.inPos = 0;
// where in the current readable buffer we've read up to
this.outPos = 0;
// consuming pipe streams go here
this.pipes = [];
// controls emit('data')
this.paused = false;
this.encoding = null;
};
utils.inherits(StreamBuf, Stream.Duplex, {
toBuffer: function toBuffer() {
switch (this.buffers.length) {
case 0:
return null;
case 1:
return this.buffers[0].toBuffer();
default:
return Buffer.concat(this.buffers.map(function (rwBuf) {
return rwBuf.toBuffer();
}));
}
},
// writable
// event drain - if write returns false (which it won't), indicates when safe to write again.
// finish - end() has been called
// pipe(src) - pipe() has been called on readable
// unpipe(src) - unpipe() has been called on readable
// error - duh
_getWritableBuffer: function _getWritableBuffer() {
if (this.buffers.length) {
var last = this.buffers[this.buffers.length - 1];
if (!last.full) {
return last;
}
}
var buf = new ReadWriteBuf(this.bufSize);
this.buffers.push(buf);
return buf;
},
_pipe: function _pipe(chunk) {
var _this = this;
return _asyncToGenerator( /*#__PURE__*/_regeneratorRuntime().mark(function _callee() {
var write;
return _regeneratorRuntime().wrap(function _callee$(_context) {
while (1) switch (_context.prev = _context.next) {
case 0:
write = function write(pipe) {
return new Promise(function (resolve) {
pipe.write(chunk.toBuffer(), function () {
resolve();
});
});
};
_context.next = 3;
return Promise.all(_this.pipes.map(write));
case 3:
case "end":
return _context.stop();
}
}, _callee);
}))();
},
_writeToBuffers: function _writeToBuffers(chunk) {
var inPos = 0;
var inLen = chunk.length;
while (inPos < inLen) {
// find writable buffer
var buffer = this._getWritableBuffer();
// write some data
inPos += buffer.write(chunk, inPos, inLen - inPos);
}
},
write: function write(data, encoding, callback) {
var _this2 = this;
return _asyncToGenerator( /*#__PURE__*/_regeneratorRuntime().mark(function _callee2() {
var chunk;
return _regeneratorRuntime().wrap(function _callee2$(_context2) {
while (1) switch (_context2.prev = _context2.next) {
case 0:
if (encoding instanceof Function) {
callback = encoding;
encoding = 'utf8';
}
callback = callback || utils.nop;
// encapsulate data into a chunk
if (!(data instanceof StringBuf)) {
_context2.next = 6;
break;
}
chunk = new StringBufChunk(data);
_context2.next = 15;
break;
case 6:
if (!(data instanceof Buffer)) {
_context2.next = 10;
break;
}
chunk = new BufferChunk(data);
_context2.next = 15;
break;
case 10:
if (!(typeof data === 'string' || data instanceof String || data instanceof ArrayBuffer)) {
_context2.next = 14;
break;
}
chunk = new StringChunk(data, encoding);
_context2.next = 15;
break;
case 14:
throw new Error('Chunk must be one of type String, Buffer or StringBuf.');
case 15:
if (!_this2.pipes.length) {
_context2.next = 36;
break;
}
if (!_this2.batch) {
_context2.next = 25;
break;
}
_this2._writeToBuffers(chunk);
case 18:
if (!(!_this2.corked && _this2.buffers.length > 1)) {
_context2.next = 23;
break;
}
_context2.next = 21;
return _this2._pipe(_this2.buffers.shift());
case 21:
_context2.next = 18;
break;
case 23:
_context2.next = 34;
break;
case 25:
if (_this2.corked) {
_context2.next = 32;
break;
}
_context2.next = 28;
return _this2._pipe(chunk);
case 28:
_context2.next = 30;
return callback();
case 30:
_context2.next = 34;
break;
case 32:
_this2._writeToBuffers(chunk);
process.nextTick(callback);
case 34:
_context2.next = 39;
break;
case 36:
if (!_this2.paused) {
_this2.emit('data', chunk.toBuffer());
}
_this2._writeToBuffers(chunk);
_this2.emit('readable');
case 39:
return _context2.abrupt("return", true);
case 40:
case "end":
return _context2.stop();
}
}, _callee2);
}))();
},
cork: function cork() {
this.corked = true;
},
_flush: function _flush() {
var _this3 = this;
return _asyncToGenerator( /*#__PURE__*/_regeneratorRuntime().mark(function _callee3() {
return _regeneratorRuntime().wrap(function _callee3$(_context3) {
while (1) switch (_context3.prev = _context3.next) {
case 0:
if (!_this3.pipes.length) {
_context3.next = 6;
break;
}
case 1:
if (!_this3.buffers.length) {
_context3.next = 6;
break;
}
_context3.next = 4;
return _this3._pipe(_this3.buffers.shift());
case 4:
_context3.next = 1;
break;
case 6:
case "end":
return _context3.stop();
}
}, _callee3);
}))();
} /* destination */,
uncork: function uncork() {
this.corked = false;
this._flush();
},
end: function end(chunk, encoding, callback) {
var _this4 = this;
return _asyncToGenerator( /*#__PURE__*/_regeneratorRuntime().mark(function _callee5() {
var writeComplete;
return _regeneratorRuntime().wrap(function _callee5$(_context5) {
while (1) switch (_context5.prev = _context5.next) {
case 0:
writeComplete = /*#__PURE__*/function () {
var _ref = _asyncToGenerator( /*#__PURE__*/_regeneratorRuntime().mark(function _callee4(error) {
return _regeneratorRuntime().wrap(function _callee4$(_context4) {
while (1) switch (_context4.prev = _context4.next) {
case 0:
if (!error) {
_context4.next = 4;
break;
}
callback(error);
_context4.next = 8;
break;
case 4:
_context4.next = 6;
return _this4._flush();
case 6:
_this4.pipes.forEach(function (pipe) {
pipe.end();
});
_this4.emit('finish');
case 8:
case "end":
return _context4.stop();
}
}, _callee4);
}));
return function writeComplete(_x) {
return _ref.apply(this, arguments);
};
}();
if (!chunk) {
_context5.next = 6;
break;
}
_context5.next = 4;
return _this4.write(chunk, encoding, writeComplete);
case 4:
_context5.next = 8;
break;
case 6:
_context5.next = 8;
return writeComplete();
case 8:
case "end":
return _context5.stop();
}
}, _callee5);
}))();
},
// readable
// event readable - some data is now available
// event data - switch to flowing mode - feeds chunks to handler
// event end - no more data
// event close - optional, indicates upstream close
// event error - duh
read: function read(size) {
var buffers;
// read min(buffer, size || infinity)
if (size) {
buffers = [];
while (size && this.buffers.length && !this.buffers[0].eod) {
var first = this.buffers[0];
var buffer = first.read(size);
size -= buffer.length;
buffers.push(buffer);
if (first.eod && first.full) {
this.buffers.shift();
}
}
return Buffer.concat(buffers);
}
buffers = this.buffers.map(function (buf) {
return buf.toBuffer();
}).filter(Boolean);
this.buffers = [];
return Buffer.concat(buffers);
},
setEncoding: function setEncoding(encoding) {
// causes stream.read or stream.on('data) to return strings of encoding instead of Buffer objects
this.encoding = encoding;
},
pause: function pause() {
this.paused = true;
},
resume: function resume() {
this.paused = false;
},
isPaused: function isPaused() {
return !!this.paused;
},
pipe: function pipe(destination) {
// add destination to pipe list & write current buffer
this.pipes.push(destination);
if (!this.paused && this.buffers.length) {
this.end();
}
},
unpipe: function unpipe(destination) {
// remove destination from pipe list
this.pipes = this.pipes.filter(function (pipe) {
return pipe !== destination;
});
},
unshift: function unshift() {
// some numpty has read some data that's not for them and they want to put it back!
// Might implement this some day
throw new Error('Not Implemented');
} /* chunk */,
wrap: function wrap() {
// not implemented
throw new Error('Not Implemented');
} /* stream */
});
module.exports = StreamBuf;
//# sourceMappingURL=stream-buf.js.map