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streams: refactor BufferList into ES6 class

PR-URL: #12644
Reviewed-By: Brian White <mscdex@mscdex.net>
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jasnell committed Apr 24, 2017
1 parent ed0716f commit e2199e0fc22fe0fa8efc7192cf01daebdb43a29a
Showing with 58 additions and 58 deletions.
  1. +58 −58 lib/internal/streams/BufferList.js
@@ -2,71 +2,71 @@

const Buffer = require('buffer').Buffer;

module.exports = BufferList;
module.exports = class BufferList {
constructor() {
this.head = null;
this.tail = null;
this.length = 0;
}

function BufferList() {
this.head = null;
this.tail = null;
this.length = 0;
}
push(v) {
const entry = { data: v, next: null };
if (this.length > 0)
this.tail.next = entry;
else
this.head = entry;
this.tail = entry;
++this.length;
}

BufferList.prototype.push = function(v) {
const entry = { data: v, next: null };
if (this.length > 0)
this.tail.next = entry;
else
unshift(v) {
const entry = { data: v, next: this.head };
if (this.length === 0)
this.tail = entry;
this.head = entry;
this.tail = entry;
++this.length;
};
++this.length;
}

BufferList.prototype.unshift = function(v) {
const entry = { data: v, next: this.head };
if (this.length === 0)
this.tail = entry;
this.head = entry;
++this.length;
};
shift() {
if (this.length === 0)
return;
const ret = this.head.data;
if (this.length === 1)
this.head = this.tail = null;
else
this.head = this.head.next;
--this.length;
return ret;
}

BufferList.prototype.shift = function() {
if (this.length === 0)
return;
const ret = this.head.data;
if (this.length === 1)
clear() {
this.head = this.tail = null;
else
this.head = this.head.next;
--this.length;
return ret;
};

BufferList.prototype.clear = function() {
this.head = this.tail = null;
this.length = 0;
};
this.length = 0;
}

BufferList.prototype.join = function(s) {
if (this.length === 0)
return '';
var p = this.head;
var ret = '' + p.data;
while (p = p.next)
ret += s + p.data;
return ret;
};
join(s) {
if (this.length === 0)
return '';
var p = this.head;
var ret = '' + p.data;
while (p = p.next)
ret += s + p.data;
return ret;
}

BufferList.prototype.concat = function(n) {
if (this.length === 0)
return Buffer.alloc(0);
if (this.length === 1)
return this.head.data;
const ret = Buffer.allocUnsafe(n >>> 0);
var p = this.head;
var i = 0;
while (p) {
p.data.copy(ret, i);
i += p.data.length;
p = p.next;
concat(n) {
if (this.length === 0)
return Buffer.alloc(0);
if (this.length === 1)
return this.head.data;
const ret = Buffer.allocUnsafe(n >>> 0);
var p = this.head;
var i = 0;
while (p) {
p.data.copy(ret, i);
i += p.data.length;
p = p.next;
}
return ret;
}
return ret;
};

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