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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.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
import com.google.javascript.rhino.IR;
import com.google.javascript.rhino.Node;
import java.util.regex.Pattern;
/**
* Generates goog.exportSymbol for test functions, so they can be recognized
* by the test runner, even if the code is compiled.
*/
public class ExportTestFunctions implements CompilerPass {
private static final Pattern TEST_FUNCTIONS_NAME_PATTERN =
Pattern.compile(
"^(?:((\\w+\\.)+prototype\\.||window\\.)*"
+ "(setUpPage|setUp|shouldRunTests|tearDown|tearDownPage|test[\\w\\$]+))$");
private static final String GOOG_TESTING_TEST_SUITE = "goog.testing.testSuite";
private final AbstractCompiler compiler;
private final String exportSymbolFunction;
private final String exportPropertyFunction;
/**
* Creates a new export test functions compiler pass.
* @param compiler
* @param exportSymbolFunction The function name used to export symbols in JS.
* @param exportPropertyFunction The function name used to export properties
* in JS.
*/
ExportTestFunctions(AbstractCompiler compiler,
String exportSymbolFunction, String exportPropertyFunction) {
checkNotNull(compiler);
this.compiler = compiler;
this.exportSymbolFunction = exportSymbolFunction;
this.exportPropertyFunction = exportPropertyFunction;
}
private class ExportTestFunctionsNodes extends NodeTraversal.AbstractShallowCallback {
@Override
public void visit(NodeTraversal t, Node n, Node parent) {
if (parent == null) {
return;
}
if (parent.isScript() || parent.isModuleBody()) {
if (NodeUtil.isFunctionDeclaration(n)) {
// Check for a test function statement.
String functionName = NodeUtil.getName(n);
if (isTestFunction(functionName)) {
exportTestFunctionAsSymbol(functionName, n);
}
} else if (isNameDeclaredFunction(n)) {
// Check for a test function expression.
Node functionNode = n.getFirstFirstChild();
String functionName = NodeUtil.getName(functionNode);
if (isTestFunction(functionName)) {
exportTestFunctionAsSymbol(functionName, n);
}
} else if (isNameDeclaredClass(n)) {
Node classNode = n.getFirstFirstChild();
String className = NodeUtil.getName(classNode);
exportClass(classNode, className, n);
} else if (n.isClass()) {
exportClass(n);
}
} else if (NodeUtil.isExprAssign(parent)) {
// Check for a test method assignment.
Node grandparent = parent.getParent();
if (grandparent != null && (grandparent.isScript() || grandparent.isModuleBody())) {
// NAME/(GETPROP -> ... -> NAME)
// SCRIPT -> EXPR_RESULT -> ASSIGN ->
// FUNCTION/CLASS
Node firstChild = n.getFirstChild();
Node lastChild = n.getLastChild();
String nodeName = firstChild.getQualifiedName();
if (lastChild.isFunction()) {
if (isTestFunction(nodeName)) {
if (n.getFirstChild().isName()) {
exportTestFunctionAsSymbol(nodeName, parent);
} else {
exportTestFunctionAsProperty(firstChild, n);
}
}
} else if (lastChild.isClass()) {
exportClass(lastChild, nodeName, parent);
}
}
} else if (isTestSuiteArgument(n, t)) {
for (Node c = n.getFirstChild(); c != null; ) {
final Node next = c.getNext();
if (c.isStringKey() && !c.isQuotedString()) {
c.setQuotedString();
compiler.reportChangeToEnclosingScope(c);
} else if (c.isMemberFunctionDef()) {
rewriteMemberDefInObjLit(c, n);
}
c = next;
}
}
}
private void exportClass(Node classNode) {
String className = NodeUtil.getName(classNode);
exportClass(classNode, className, classNode);
}
private void exportClass(Node classNode, String className, Node addAfter) {
Node classMembers = classNode.getLastChild();
for (Node maybeMemberFunctionDef = classMembers.getFirstChild();
maybeMemberFunctionDef != null;
maybeMemberFunctionDef = maybeMemberFunctionDef.getNext()) {
if (maybeMemberFunctionDef.isMemberFunctionDef()) {
String methodName = maybeMemberFunctionDef.getString();
if (isTestFunction(methodName)) {
String functionRef = className + ".prototype." + methodName;
String classRef = className + ".prototype";
Node exportCallTarget =
NodeUtil.newQName(
compiler, exportPropertyFunction, maybeMemberFunctionDef, methodName);
Node call = IR.call(exportCallTarget);
if (exportCallTarget.isName()) {
call.putBooleanProp(Node.FREE_CALL, true);
}
call.addChildToBack(
NodeUtil.newQName(compiler, classRef, maybeMemberFunctionDef, classRef));
call.addChildToBack(IR.string(methodName));
call.addChildToBack(
NodeUtil.newQName(compiler, functionRef, maybeMemberFunctionDef, functionRef));
Node expression = IR.exprResult(call).srcrefTreeIfMissing(maybeMemberFunctionDef);
expression.insertAfter(addAfter);
compiler.reportChangeToEnclosingScope(expression);
addAfter = expression;
}
}
}
}
/** Converts a member function into a quoted string key to avoid property renaming */
private void rewriteMemberDefInObjLit(Node memberDef, Node objLit) {
String name = memberDef.getString();
Node stringKey = IR.stringKey(name, memberDef.removeFirstChild());
memberDef.replaceWith(stringKey);
stringKey.setQuotedString();
stringKey.setJSDocInfo(memberDef.getJSDocInfo());
compiler.reportChangeToEnclosingScope(objLit);
}
/**
* Get the node that corresponds to an expression declared with var, let or const.
* This has the AST structure VAR/LET/CONST -> NAME -> NODE
* @param node
*/
private Node getNameDeclaredGrandchild(Node node) {
if (!NodeUtil.isNameDeclaration(node)) {
return null;
}
return node.getFirstFirstChild();
}
/**
* Whether node corresponds to a function expression declared with var, let
* or const which is of the form:
*
* var/let/const functionName = function() {
* // Implementation
* };
*
* This has the AST structure VAR/LET/CONST -> NAME -> FUNCTION
* @param node
*/
private boolean isNameDeclaredFunction(Node node) {
Node grandchild = getNameDeclaredGrandchild(node);
return grandchild != null && grandchild.isFunction();
}
/**
* Whether node corresponds to a class declared with var, let or const which
* is of the form:
*
* var/let/const className = class {
* // Implementation
* };
*
* This has the AST structure VAR/LET/CONST -> NAME -> CLASS
* @param node
*/
private boolean isNameDeclaredClass(Node node) {
Node grandchild = getNameDeclaredGrandchild(node);
return grandchild != null && grandchild.isClass();
}
}
@Override
public void process(Node externs, Node root) {
NodeTraversal.traverse(compiler, root, new ExportTestFunctionsNodes());
}
// Adds exportSymbol(testFunctionName, testFunction);
private void exportTestFunctionAsSymbol(String testFunctionName, Node node) {
Node exportCallTarget = NodeUtil.newQName(compiler,
exportSymbolFunction, node, testFunctionName);
Node call = IR.call(exportCallTarget);
if (exportCallTarget.isName()) {
call.putBooleanProp(Node.FREE_CALL, true);
}
call.addChildToBack(IR.string(testFunctionName));
call.addChildToBack(NodeUtil.newQName(compiler,
testFunctionName, node, testFunctionName));
Node expression = IR.exprResult(call).srcrefTreeIfMissing(node);
expression.insertAfter(node);
compiler.reportChangeToEnclosingScope(expression);
}
// Adds exportProperty() of the test function name on the prototype object
private void exportTestFunctionAsProperty(Node fullyQualifiedFunctionName, Node node) {
checkState(fullyQualifiedFunctionName.isGetProp(), fullyQualifiedFunctionName);
String testFunctionName =
NodeUtil.getPrototypePropertyName(node.getFirstChild());
if (node.getFirstChild().getQualifiedName().startsWith("window.")) {
testFunctionName = node.getFirstChild().getQualifiedName().substring("window.".length());
}
Node exportCall =
IR.call(
NodeUtil.newQName(this.compiler, this.exportPropertyFunction),
fullyQualifiedFunctionName.getOnlyChild().cloneTree(),
IR.string(testFunctionName),
fullyQualifiedFunctionName.cloneTree());
exportCall.putBooleanProp(Node.FREE_CALL, exportCall.getFirstChild().isName());
Node export = IR.exprResult(exportCall).srcrefTree(node);
export.insertAfter(node.getParent());
compiler.reportChangeToEnclosingScope(export);
}
/**
* Whether this is an object literal containing test methods passed to goog.testing.testSuite
*
* @param t We only need the scope from this NodeTraversal but want to lazily create the scope.
*/
private static boolean isTestSuiteArgument(Node n, NodeTraversal t) {
return n.isObjectLit()
&& n.getParent().isCall()
&& n.isSecondChildOf(n.getParent())
&& isGoogTestingTestSuite(t, n.getPrevious());
}
/**
* Whether this node is a reference to goog.testing.testSuite, either through a goog.require or by
* its fully qualified name.
*
* If this becomes more broadly useful consider branching it into its own class and making more
* robust to handle forwardDeclares, destructuring requires, etc.
*/
private static boolean isGoogTestingTestSuite(NodeTraversal t, Node qname) {
qname = NodeUtil.getCallTargetResolvingIndirectCalls(qname.getParent());
if (!qname.isQualifiedName()) {
return false;
}
Node root = NodeUtil.getRootOfQualifiedName(qname);
String rootName = root.getString();
Var rootVar = t.getScope().getSlot(rootName);
if (rootVar == null || rootVar.isGlobal()) {
return qname.matchesQualifiedName(GOOG_TESTING_TEST_SUITE);
} else if (rootVar.getScope().isModuleScope()) {
Node originalValue = rootVar.getInitialValue();
return originalValue != null
&& originalValue.isCall()
&& originalValue.getFirstChild().matchesQualifiedName("goog.require")
&& originalValue.hasTwoChildren()
&& originalValue.getSecondChild().getString().equals(GOOG_TESTING_TEST_SUITE);
}
return false;
}
/**
* Whether a function is recognized as a test function. We follow the JsUnit
* convention for naming (functions should start with "test"), and we also
* check if it has no parameters declared.
*
* @param functionName The name of the function
* @return {@code true} if the function is recognized as a test function.
*/
public static boolean isTestFunction(String functionName) {
return functionName != null
&& TEST_FUNCTIONS_NAME_PATTERN.matcher(functionName).matches();
}
}