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Closure Compiler is a JavaScript optimizing compiler. It parses your
JavaScript, analyzes it, removes dead code and rewrites and minimizes
what's left. It also checks syntax, variable references, and types, and
warns about common JavaScript pitfalls. It is used in many of Google's
JavaScript apps, including Gmail, Google Web Search, Google Maps, and
Google Docs.
This binary checks for style issues such as incorrect or missing JSDoc
usage, and missing goog.require() statements. It does not do more advanced
checks such as typechecking.
/*
* Copyright 2017 The Closure Compiler Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.javascript.jscomp;
import static com.google.common.base.Preconditions.checkState;
import com.google.javascript.rhino.Node;
import java.util.HashMap;
import java.util.Map;
/**
* Memoize a scope creator.
*
* This allows you to make multiple passes, without worrying about
* the expense of generating Scope objects over and over again.
*
* On the other hand, you also have to be more aware of what your passes
* are doing. Scopes are memoized stupidly, so if the underlying tree
* changes, the scope may be out of sync.
*/
class MemoizedScopeCreator implements ScopeCreator {
private final Map> scopesByScopeRoot = new HashMap<>();
private final ScopeCreator delegate;
/**
* @param delegate The real source of Scope objects.
*/
MemoizedScopeCreator(ScopeCreator delegate) {
this.delegate = delegate;
}
@Override
public AbstractScope, ?> createScope(Node n, AbstractScope, ?> parent) {
AbstractScope, ?> scope = scopesByScopeRoot.get(n);
if (scope == null) {
scope = delegate.createScope(n, parent);
scopesByScopeRoot.put(n, scope);
} else {
checkState(parent == scope.getParent());
}
return scope;
}
@Override
public boolean hasBlockScope() {
return delegate.hasBlockScope();
}
}