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streams: refactor BufferList into ES6 class

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PR-URL: https://github.com/nodejs/node/pull/12644
Reviewed-By: Brian White <mscdex@mscdex.net>
This commit is contained in:
James M Snell 2017-04-24 16:00:45 -07:00
parent ed0716f0e9
commit e2199e0fc2
1 changed files with 66 additions and 66 deletions
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30
lib/internal/streams/BufferList.js
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@ -2,15 +2,14 @@
const Buffer = require('buffer').Buffer; const Buffer = require('buffer').Buffer;
module.exports = BufferList; module.exports = class BufferList {
constructor() {
function BufferList() {
this.head = null; this.head = null;
this.tail = null; this.tail = null;
this.length = 0; this.length = 0;
} }
BufferList.prototype.push = function(v) { push(v) {
const entry = { data: v, next: null }; const entry = { data: v, next: null };
if (this.length > 0) if (this.length > 0)
this.tail.next = entry; this.tail.next = entry;
@ -18,17 +17,17 @@ BufferList.prototype.push = function(v) {
this.head = entry; this.head = entry;
this.tail = entry; this.tail = entry;
++this.length; ++this.length;
}; }
BufferList.prototype.unshift = function(v) { unshift(v) {
const entry = { data: v, next: this.head }; const entry = { data: v, next: this.head };
if (this.length === 0) if (this.length === 0)
this.tail = entry; this.tail = entry;
this.head = entry; this.head = entry;
++this.length; ++this.length;
}; }
BufferList.prototype.shift = function() { shift() {
if (this.length === 0) if (this.length === 0)
return; return;
const ret = this.head.data; const ret = this.head.data;
@ -38,14 +37,14 @@ BufferList.prototype.shift = function() {
this.head = this.head.next; this.head = this.head.next;
--this.length; --this.length;
return ret; return ret;
}; }
BufferList.prototype.clear = function() { clear() {
this.head = this.tail = null; this.head = this.tail = null;
this.length = 0; this.length = 0;
}; }
BufferList.prototype.join = function(s) { join(s) {
if (this.length === 0) if (this.length === 0)
return ''; return '';
var p = this.head; var p = this.head;
@ -53,9 +52,9 @@ BufferList.prototype.join = function(s) {
while (p = p.next) while (p = p.next)
ret += s + p.data; ret += s + p.data;
return ret; return ret;
}; }
BufferList.prototype.concat = function(n) { concat(n) {
if (this.length === 0) if (this.length === 0)
return Buffer.alloc(0); return Buffer.alloc(0);
if (this.length === 1) if (this.length === 1)
@ -69,4 +68,5 @@ BufferList.prototype.concat = function(n) {
p = p.next; p = p.next;
} }
return ret; return ret;
}
}; };