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A few minor perf improvements

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This commit is contained in:
Dan Abramov 2015-01-09 20:37:02 +03:00
parent 55e01afd0d
commit 5783973734
2 changed files with 19 additions and 7 deletions
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7
lib/6to5/generation/buffer.js
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@ -61,7 +61,7 @@ Buffer.prototype.space = function () {
Buffer.prototype.removeLast = function (cha) { Buffer.prototype.removeLast = function (cha) {
if (!this.isLast(cha)) return; if (!this.isLast(cha)) return;
this.buf = this.buf.slice(0, -1); this.buf = this.buf.substr(0, this.buf.length - 1);
this.position.unshift(cha); this.position.unshift(cha);
}; };
@ -114,13 +114,14 @@ Buffer.prototype._push = function (str) {
}; };
Buffer.prototype.endsWith = function (str) { Buffer.prototype.endsWith = function (str) {
return this.buf.slice(-str.length) === str; var d = this.buf.length - str.length;
return d >= 0 && this.buf.lastIndexOf(str) === d;
}; };
Buffer.prototype.isLast = function (cha, trimRight) { Buffer.prototype.isLast = function (cha, trimRight) {
var buf = this.buf; var buf = this.buf;
if (trimRight) buf = util.trimRight(buf); if (trimRight) buf = util.trimRight(buf);
var last = _.last(buf); var last = buf[buf.length - 1];
if (_.isArray(cha)) { if (_.isArray(cha)) {
return _.contains(cha, last); return _.contains(cha, last);

19
lib/6to5/generation/node/index.js
View File

@ -6,14 +6,19 @@ var t = require("../../types");
var _ = require("lodash"); var _ = require("lodash");
var find = function (obj, node, parent) { var find = function (obj, node, parent) {
if (!obj) return;
var result; var result;
_.each(obj, function (fn, type) { var types = Object.keys(obj);
for (var i = 0; i < types.length; i++) {
var type = types[i];
if (t["is" + type](node)) { if (t["is" + type](node)) {
var fn = obj[type];
result = fn(node, parent); result = fn(node, parent);
if (result != null) return false; if (result != null) break;
} }
}); }
return result; return result;
}; };
@ -99,7 +104,13 @@ _.each(Node.prototype, function (fn, key) {
Node[key] = function (node, parent) { Node[key] = function (node, parent) {
var n = new Node(node, parent); var n = new Node(node, parent);
var args = _.toArray(arguments).slice(2); // Avoid leaking arguments to prevent deoptimization
var skipCount = 2;
var args = new Array(arguments.length - skipCount);
for (var i = 0; i < args.length; i++) {
args[i] = arguments[i + 2];
}
return n[key].apply(n, args); return n[key].apply(n, args);
}; };
}); });