'use strict';
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function ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); if (enumerableOnly) symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; }); keys.push.apply(keys, symbols); } return keys; }
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function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; if (i % 2) { ownKeys(Object(source), true).forEach(function (key) { _defineProperty(target, key, source[key]); }); } else if (Object.getOwnPropertyDescriptors) { Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)); } else { ownKeys(Object(source)).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } } return target; }
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function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
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function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
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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, descriptor.key, descriptor); } }
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function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
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var _require = require('buffer'),
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Buffer = _require.Buffer;
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var _require2 = require('util'),
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inspect = _require2.inspect;
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var custom = inspect && inspect.custom || 'inspect';
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function copyBuffer(src, target, offset) {
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Buffer.prototype.copy.call(src, target, offset);
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}
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module.exports =
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/*#__PURE__*/
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function () {
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function BufferList() {
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_classCallCheck(this, BufferList);
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this.head = null;
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this.tail = null;
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this.length = 0;
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}
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_createClass(BufferList, [{
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key: "push",
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value: function push(v) {
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var entry = {
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data: v,
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next: null
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};
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if (this.length > 0) this.tail.next = entry;else this.head = entry;
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this.tail = entry;
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++this.length;
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}
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}, {
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key: "unshift",
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value: function unshift(v) {
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var entry = {
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data: v,
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next: this.head
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};
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if (this.length === 0) this.tail = entry;
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this.head = entry;
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++this.length;
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}
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}, {
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key: "shift",
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value: function shift() {
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if (this.length === 0) return;
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var ret = this.head.data;
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if (this.length === 1) this.head = this.tail = null;else this.head = this.head.next;
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--this.length;
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return ret;
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}
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}, {
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key: "clear",
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value: function clear() {
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this.head = this.tail = null;
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this.length = 0;
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}
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}, {
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key: "join",
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value: function join(s) {
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if (this.length === 0) return '';
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var p = this.head;
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var ret = '' + p.data;
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while (p = p.next) {
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ret += s + p.data;
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}
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return ret;
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}
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}, {
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key: "concat",
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value: function concat(n) {
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if (this.length === 0) return Buffer.alloc(0);
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var ret = Buffer.allocUnsafe(n >>> 0);
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var p = this.head;
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var i = 0;
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while (p) {
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copyBuffer(p.data, ret, i);
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i += p.data.length;
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p = p.next;
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}
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return ret;
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} // Consumes a specified amount of bytes or characters from the buffered data.
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}, {
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key: "consume",
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value: function consume(n, hasStrings) {
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var ret;
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if (n < this.head.data.length) {
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// `slice` is the same for buffers and strings.
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ret = this.head.data.slice(0, n);
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this.head.data = this.head.data.slice(n);
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} else if (n === this.head.data.length) {
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// First chunk is a perfect match.
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ret = this.shift();
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} else {
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// Result spans more than one buffer.
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ret = hasStrings ? this._getString(n) : this._getBuffer(n);
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}
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return ret;
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}
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}, {
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key: "first",
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value: function first() {
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return this.head.data;
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} // Consumes a specified amount of characters from the buffered data.
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}, {
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key: "_getString",
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value: function _getString(n) {
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var p = this.head;
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var c = 1;
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var ret = p.data;
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n -= ret.length;
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while (p = p.next) {
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var str = p.data;
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var nb = n > str.length ? str.length : n;
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if (nb === str.length) ret += str;else ret += str.slice(0, n);
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n -= nb;
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if (n === 0) {
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if (nb === str.length) {
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++c;
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if (p.next) this.head = p.next;else this.head = this.tail = null;
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} else {
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this.head = p;
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p.data = str.slice(nb);
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}
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break;
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}
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++c;
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}
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this.length -= c;
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return ret;
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} // Consumes a specified amount of bytes from the buffered data.
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}, {
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key: "_getBuffer",
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value: function _getBuffer(n) {
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var ret = Buffer.allocUnsafe(n);
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var p = this.head;
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var c = 1;
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p.data.copy(ret);
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n -= p.data.length;
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while (p = p.next) {
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var buf = p.data;
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var nb = n > buf.length ? buf.length : n;
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buf.copy(ret, ret.length - n, 0, nb);
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n -= nb;
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if (n === 0) {
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if (nb === buf.length) {
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++c;
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if (p.next) this.head = p.next;else this.head = this.tail = null;
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} else {
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this.head = p;
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p.data = buf.slice(nb);
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}
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break;
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}
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++c;
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}
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this.length -= c;
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return ret;
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} // Make sure the linked list only shows the minimal necessary information.
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}, {
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key: custom,
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value: function value(_, options) {
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return inspect(this, _objectSpread({}, options, {
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// Only inspect one level.
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depth: 0,
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// It should not recurse.
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customInspect: false
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}));
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}
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}]);
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return BufferList;
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}();
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