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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.
/*
* 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 com.google.javascript.jscomp.parsing.parser.util.format.SimpleFormat;
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, parent);
}
} 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, parent);
}
} else if (isNameDeclaredClass(n)) {
Node classNode = n.getFirstFirstChild();
String className = NodeUtil.getName(classNode);
exportClass(parent, classNode, className, n);
} else if (n.isClass()) {
exportClass(parent, 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, grandparent);
} else {
exportTestFunctionAsProperty(nodeName, parent, n, grandparent);
}
}
} else if (lastChild.isClass()) {
exportClass(grandparent, lastChild, nodeName, parent);
}
}
} else if (isTestSuiteArgument(n, t)) {
for (Node c : n.children()) {
if (c.isStringKey() && !c.isQuotedString()) {
c.setQuotedString();
compiler.reportChangeToEnclosingScope(c);
} else if (c.isMemberFunctionDef()) {
rewriteMemberDefInObjLit(c, n);
}
}
}
}
private void exportClass(Node scriptNode, Node classNode) {
String className = NodeUtil.getName(classNode);
exportClass(scriptNode, classNode, className, classNode);
}
private void exportClass(Node scriptNode, Node classNode, String className, Node addAfter) {
Node classMembers = classNode.getLastChild();
for (Node maybeMemberFunctionDef : classMembers.children()) {
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);
scriptNode.addChildAfter(expression, 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());
objLit.replaceChild(memberDef, 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 scriptNode) {
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);
scriptNode.addChildAfter(expression, node);
compiler.reportChangeToEnclosingScope(expression);
}
// Adds exportProperty() of the test function name on the prototype object
private void exportTestFunctionAsProperty(String fullyQualifiedFunctionName,
Node parent, Node node, Node scriptNode) {
String testFunctionName =
NodeUtil.getPrototypePropertyName(node.getFirstChild());
if (node.getFirstChild().getQualifiedName().startsWith("window.")) {
testFunctionName = node.getFirstChild().getQualifiedName().substring("window.".length());
}
String objectName = fullyQualifiedFunctionName.substring(0,
fullyQualifiedFunctionName.lastIndexOf('.'));
String exportCallStr = SimpleFormat.format("%s(%s, '%s', %s);",
exportPropertyFunction, objectName, testFunctionName,
fullyQualifiedFunctionName);
Node exportCall = this.compiler.parseSyntheticCode(exportCallStr)
.removeChildren();
exportCall.useSourceInfoFromForTree(scriptNode);
scriptNode.addChildrenAfter(exportCall, parent);
compiler.reportChangeToEnclosingScope(exportCall);
}
/**
* 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) {
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();
}
}