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switch to symbols and add matches parent helper function to abstract out matching

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This commit is contained in:
Sebastian McKenzie 2015-11-08 03:41:15 -08:00
parent f1f42164fc
commit b5b9794b3f
1 changed files with 13 additions and 4 deletions
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17
packages/babel-traverse/src/scope/index.js
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@ -13,8 +13,8 @@ import * as t from "babel-types";
//
const CACHE_SINGLE_KEY = "_scope"; //Symbol();
const CACHE_MULTIPLE_KEY = "_scopes"; //Symbol();
const CACHE_SINGLE_KEY = Symbol();
const CACHE_MULTIPLE_KEY = Symbol();
/**
* To avoid creating a new Scope instance for each traversal, we maintain a cache on the
@ -28,7 +28,7 @@ function getCache(node, parentScope, self) {
if (singleCache) {
// we've only ever associated one scope with this node so let's check it
if (singleCache.parent === parentScope) {
if (matchesParent(singleCache, parentScope)) {
return singleCache;
}
} else if (!node[CACHE_MULTIPLE_KEY]) {
@ -42,6 +42,12 @@ function getCache(node, parentScope, self) {
return getCacheMultiple(node, parentScope, self, singleCache);
}
function matchesParent(scope, parentScope) {
if (scope.parent === parentScope) {
return true;
}
}
function getCacheMultiple(node, parentScope, self, singleCache) {
let scopes: Array<Scope> = node[CACHE_MULTIPLE_KEY] = node[CACHE_MULTIPLE_KEY] || [];
@ -53,7 +59,7 @@ function getCacheMultiple(node, parentScope, self, singleCache) {
// loop through and check each scope to see if it matches our parent
for (let scope of scopes) {
if (scope.parent === parentScope) return scope;
if (matchesParent(scope, parentScope)) return scope;
}
scopes.push(self);
@ -155,6 +161,8 @@ let collectorVisitor = {
}
};
let uid = 0;
export default class Scope {
/**
@ -170,6 +178,7 @@ export default class Scope {
let cached = getCache(path.node, parentScope, this);
if (cached) return cached;
this.uid = uid++;
this.parent = parentScope;
this.hub = path.hub;