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Liferay Frontend JS Minifier
/*
* Copyright 2009 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.jscomp.NodeTraversal.AbstractPostOrderCallback;
import com.google.javascript.rhino.Node;
import java.util.HashSet;
import java.util.Set;
/**
* External references of the form: "window['xx']" indicate names that must
* be reserved when variable renaming to avoid conflicts.
*
* @author [email protected] (John Lenz)
*/
class GatherRawExports extends AbstractPostOrderCallback
implements CompilerPass {
private final AbstractCompiler compiler;
// TODO(johnlenz): "goog$global" should be part of a coding convention.
// Note: GatherRawExports runs after property renaming and
// collapse properties, so the two entries here protect goog.global in the
// two common cases "collapse properties and renaming on" or both off
// but not the case where only property renaming is on.
private static final String[] GLOBAL_THIS_NAMES = {
"window", "top", "goog$global", "goog.global" };
private final Set exportedVariables = new HashSet<>();
GatherRawExports(AbstractCompiler compiler) {
this.compiler = compiler;
}
@Override
public void process(Node externs, Node root) {
checkState(compiler.getLifeCycleStage().isNormalized());
NodeTraversal.traverseEs6(compiler, root, this);
}
@Override
public void visit(NodeTraversal t, Node n, Node parent) {
Node sibling = n.getNext();
if (sibling != null && sibling.isString() && NodeUtil.isGet(parent)
&& isGlobalThisObject(t, n)) {
exportedVariables.add(sibling.getString());
}
}
private static boolean isGlobalThisObject(NodeTraversal t, Node n) {
if (n.isThis()) {
return t.inGlobalHoistScope();
} else if (n.isQualifiedName()) {
int items = GLOBAL_THIS_NAMES.length;
for (int i = 0; i < items; i++) {
if (n.matchesQualifiedName(GLOBAL_THIS_NAMES[i])) {
return true;
}
}
}
return false;
}
public Set getExportedVariableNames() {
return exportedVariables;
}
}