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/*
* Copyright 2012 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.common.base.Joiner;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.javascript.jscomp.NodeTraversal.AbstractPostOrderCallback;
import com.google.javascript.rhino.IR;
import com.google.javascript.rhino.JSDocInfo;
import com.google.javascript.rhino.JSDocInfo.Visibility;
import com.google.javascript.rhino.JSDocInfoBuilder;
import com.google.javascript.rhino.JSTypeExpression;
import com.google.javascript.rhino.Node;
import com.google.javascript.rhino.Token;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* Rewrites "goog.defineClass" into a form that is suitable for
* type checking and dead code elimination.
*/
class ClosureRewriteClass extends AbstractPostOrderCallback
implements HotSwapCompilerPass {
// Errors
static final DiagnosticType GOOG_CLASS_TARGET_INVALID = DiagnosticType.error(
"JSC_GOOG_CLASS_TARGET_INVALID",
"Unsupported class definition expression.");
static final DiagnosticType GOOG_CLASS_SUPER_CLASS_NOT_VALID = DiagnosticType.error(
"JSC_GOOG_CLASS_SUPER_CLASS_NOT_VALID",
"The super class must be null or a valid name reference");
static final DiagnosticType GOOG_CLASS_DESCRIPTOR_NOT_VALID = DiagnosticType.error(
"JSC_GOOG_CLASS_DESCRIPTOR_NOT_VALID",
"The class must be defined by an object literal");
static final DiagnosticType GOOG_CLASS_CONSTRUCTOR_MISSING = DiagnosticType.error(
"JSC_GOOG_CLASS_CONSTRUCTOR_MISSING",
"The 'constructor' property is missing for the class definition");
static final DiagnosticType GOOG_CLASS_CONSTRUCTOR_NOT_VALID = DiagnosticType.error(
"JSC_GOOG_CLASS_CONSTRUCTOR_NOT_VALID",
"The 'constructor' expression must be a function literal");
static final DiagnosticType GOOG_CLASS_CONSTRUCTOR_ON_INTERFACE = DiagnosticType.error(
"JSC_GOOG_CLASS_CONSTRUCTOR_ON_INTERFACE",
"An interface definition should not have a 'constructor' property");
static final DiagnosticType GOOG_CLASS_STATICS_NOT_VALID = DiagnosticType.error(
"JSC_GOOG_CLASS_STATICS_NOT_VALID",
"The class 'statics' property must be an object or function literal");
static final DiagnosticType GOOG_CLASS_UNEXPECTED_PARAMS = DiagnosticType.error(
"JSC_GOOG_CLASS_UNEXPECTED_PARAMS",
"Too many arguments to goog.defineClass.");
static final DiagnosticType GOOG_CLASS_ES6_COMPUTED_PROP_NAMES_NOT_SUPPORTED =
DiagnosticType.error(
"JSC_GOOG_CLASS_ES6_COMPUTED_PROP_NAMES_NOT_SUPPORTED",
"Computed property names not supported in goog.defineClass.");
static final DiagnosticType GOOG_CLASS_ES6_ARROW_FUNCTION_NOT_SUPPORTED =
DiagnosticType.error(
"JSC_GOOG_CLASS_ES6_ARROW_FUNCTION_NOT_SUPPORTED",
"Arrow functions not supported in goog.defineClass. Object literal method"
+ " definition may be an alternative.");
// Warnings
static final DiagnosticType GOOG_CLASS_NG_INJECT_ON_CLASS = DiagnosticType.warning(
"JSC_GOOG_CLASS_NG_INJECT_ON_CLASS",
"@ngInject should be declared on the constructor, not on the class.");
private final AbstractCompiler compiler;
public ClosureRewriteClass(AbstractCompiler compiler) {
this.compiler = compiler;
}
@Override
public void process(Node externs, Node root) {
hotSwapScript(root, null);
}
@Override
public void hotSwapScript(Node scriptRoot, Node originalRoot) {
NodeTraversal.traverse(compiler, scriptRoot, this);
}
@Override
public void visit(NodeTraversal t, Node n, Node parent) {
if (n.isCall() && isGoogDefineClass(n) && !validateUsage(n)) {
compiler.report(JSError.make(n, GOOG_CLASS_TARGET_INVALID));
}
maybeRewriteClassDefinition(t, n);
}
private boolean validateUsage(Node n) {
// There are only three valid usage patterns for of goog.defineClass
// var ClassName = googDefineClass
// namespace.ClassName = googDefineClass
// and within an objectlit, used by the goog.defineClass.
Node parent = n.getParent();
switch (parent.getToken()) {
case NAME:
return true;
case ASSIGN:
return n == parent.getLastChild() && parent.getParent().isExprResult();
case STRING_KEY:
return isContainedInGoogDefineClass(parent);
default:
break;
}
return false;
}
private boolean isContainedInGoogDefineClass(Node n) {
while (n != null) {
n = n.getParent();
if (n.isCall()) {
if (isGoogDefineClass(n)) {
return true;
}
} else if (!n.isObjectLit() && !n.isStringKey()) {
break;
}
}
return false;
}
private void maybeRewriteClassDefinition(NodeTraversal t, Node n) {
if (NodeUtil.isNameDeclaration(n)) {
Node target = n.getFirstChild();
Node value = target.getFirstChild();
maybeRewriteClassDefinition(t, n, target, value);
} else if (NodeUtil.isExprAssign(n)) {
Node assign = n.getFirstChild();
Node target = assign.getFirstChild();
Node value = assign.getLastChild();
maybeRewriteClassDefinition(t, n, target, value);
}
}
private void maybeRewriteClassDefinition(
NodeTraversal t, Node n, Node target, Node value) {
if (isGoogDefineClass(value)) {
if (!target.isQualifiedName()) {
compiler.report(JSError.make(n, GOOG_CLASS_TARGET_INVALID));
}
ClassDefinition def = extractClassDefinition(target, value);
if (def != null) {
value.detach();
target.detach();
rewriteGoogDefineClass(t, n, def);
}
}
}
private static class MemberDefinition {
final JSDocInfo info;
final Node name;
final Node value;
MemberDefinition(JSDocInfo info, Node name, Node value) {
this.info = info;
this.name = name;
this.value = value;
}
}
private static final class ClassDefinition {
final Node name;
final JSDocInfo classInfo;
final Node superClass;
final MemberDefinition constructor;
final List staticProps;
final List props;
final Node classModifier;
ClassDefinition(
Node name,
JSDocInfo classInfo,
Node superClass,
MemberDefinition constructor,
List staticProps,
List props,
Node classModifier) {
this.name = name;
this.classInfo = classInfo;
this.superClass = superClass;
this.constructor = constructor;
this.staticProps = staticProps;
this.props = props;
this.classModifier = classModifier;
}
}
/**
* Validates the class definition and if valid, destructively extracts
* the class definition from the AST.
*/
private ClassDefinition extractClassDefinition(
Node targetName, Node callNode) {
JSDocInfo classInfo = NodeUtil.getBestJSDocInfo(targetName);
// name = goog.defineClass(superClass, {...}, [modifier, ...])
Node superClass = NodeUtil.getArgumentForCallOrNew(callNode, 0);
if (superClass == null
|| (!superClass.isNull()
&& !superClass.isQualifiedName()
&& !NodeUtil.isCallTo(superClass, "goog.module.get"))) {
compiler.report(JSError.make(callNode, GOOG_CLASS_SUPER_CLASS_NOT_VALID));
return null;
}
if (NodeUtil.isNullOrUndefined(superClass) || superClass.matchesName("Object")) {
superClass = null;
}
Node description = NodeUtil.getArgumentForCallOrNew(callNode, 1);
if (!validateObjLit(description, callNode)) {
// Errors will be reported in the validate method. Keeping here clean
return null;
}
int paramCount = callNode.getChildCount() - 1;
if (paramCount > 2) {
compiler.report(JSError.make(callNode, GOOG_CLASS_UNEXPECTED_PARAMS));
return null;
}
Node constructor = extractProperty(description, "constructor");
if (classInfo != null && classInfo.isInterface()) {
if (constructor != null) {
compiler.report(JSError.make(description, GOOG_CLASS_CONSTRUCTOR_ON_INTERFACE));
return null;
}
} else if (constructor == null) {
// report missing constructor
compiler.report(JSError.make(description, GOOG_CLASS_CONSTRUCTOR_MISSING));
return null;
} else {
if (!constructor.isFunction()) {
compiler.report(JSError.make(constructor, GOOG_CLASS_CONSTRUCTOR_NOT_VALID));
}
}
if (constructor == null) {
constructor = IR.function(
IR.name("").srcref(callNode),
IR.paramList().srcref(callNode),
IR.block().srcref(callNode));
constructor.srcref(callNode);
compiler.reportChangeToChangeScope(constructor);
}
JSDocInfo info = NodeUtil.getBestJSDocInfo(constructor);
Node classModifier = null;
Node statics = null;
Node staticsProp = extractProperty(description, "statics");
if (staticsProp != null) {
if (staticsProp.isObjectLit()){
if (!validateObjLit(staticsProp, staticsProp.getParent())) {
// Errors will be reported in the validate method. Keeping here clean
return null;
}
statics = staticsProp;
} else if (staticsProp.isFunction()) {
classModifier = staticsProp;
} else {
compiler.report(
JSError.make(staticsProp, GOOG_CLASS_STATICS_NOT_VALID));
return null;
}
}
if (statics == null) {
statics = IR.objectlit();
}
// Ok, now rip apart the definition into its component pieces.
// Remove the "special" property key nodes.
maybeDetach(constructor.getParent());
maybeDetach(statics.getParent());
if (classModifier != null) {
maybeDetach(classModifier.getParent());
}
ClassDefinition def = new ClassDefinition(
targetName,
classInfo,
maybeDetach(superClass),
new MemberDefinition(info, null, maybeDetach(constructor)),
objectLitToList(maybeDetach(statics)),
objectLitToList(description),
maybeDetach(classModifier));
return def;
}
private static Node maybeDetach(Node node) {
if (node != null && node.getParent() != null) {
node.detach();
}
return node;
}
/**
* @param objlit the object literal being checked.
* @param parent the parent of the object literal node
* @return false if the node is not an object literal, or if it contains any
* property that is neither unquoted plain property nor member
* function definition (ES6 feature)
*/
private boolean validateObjLit(Node objlit, Node parent) {
if (objlit == null || !objlit.isObjectLit()) {
reportErrorOnContext(parent);
return false;
}
for (Node key : objlit.children()) {
if (key.isMemberFunctionDef()) {
continue;
}
if (key.isComputedProp()) {
// report using computed property name
compiler.report(JSError.make(objlit,
GOOG_CLASS_ES6_COMPUTED_PROP_NAMES_NOT_SUPPORTED));
return false;
}
if (key.isStringKey() && key.getFirstChild().isArrowFunction()) {
// report using arrow function
compiler.report(JSError.make(objlit,
GOOG_CLASS_ES6_ARROW_FUNCTION_NOT_SUPPORTED));
return false;
}
if (!key.isStringKey() || key.isQuotedString()) {
reportErrorOnContext(parent);
return false;
}
}
return true;
}
private void reportErrorOnContext(Node parent){
if (parent.isStringKey()){
compiler.report(JSError.make(parent, GOOG_CLASS_STATICS_NOT_VALID));
} else {
// Report error in the context that the objlit is an
// argument of goog.defineClass call.
checkState(parent.isCall());
compiler.report(JSError.make(parent, GOOG_CLASS_DESCRIPTOR_NOT_VALID));
}
}
/**
* @return The first property in the objlit that matches the key.
*/
private static Node extractProperty(Node objlit, String keyName) {
for (Node keyNode : objlit.children()) {
if (keyNode.getString().equals(keyName)) {
return keyNode.getFirstChild();
}
}
return null;
}
private static List objectLitToList(
Node objlit) {
List result = new ArrayList<>();
for (Node keyNode : objlit.children()) {
Node name = keyNode;
// The span of a member function def is the whole function. The NAME node should be the
// first-first child, which will have a span for just the name of the function.
if (keyNode.isMemberFunctionDef()) {
name = keyNode.getFirstFirstChild().cloneNode();
name.setString(keyNode.getString());
}
result.add(
new MemberDefinition(
NodeUtil.getBestJSDocInfo(keyNode), name, keyNode.removeFirstChild()));
}
objlit.detachChildren();
return result;
}
private void rewriteGoogDefineClass(NodeTraversal t, Node exprRoot, final ClassDefinition cls) {
// For simplicity add everything into a block, before adding it to the AST.
Node block = IR.block();
// remove the original jsdoc info if it was attached to the value.
cls.constructor.value.setJSDocInfo(null);
if (NodeUtil.isNameDeclaration(exprRoot)) {
// example: var ctr = function(){}
Node decl =
IR.declaration(cls.name.cloneTree(), cls.constructor.value, exprRoot.getToken())
.srcref(exprRoot);
// TODO(b/138324343): remove this special case for names in module scopes, which is
// here only to unblock moving module rewriting later. this should warn instead of being
// a no-op.
JSDocInfo mergedClassInfo =
mergeJsDocFor(
cls, decl, /* includeConstructorExport= */ !exprRoot.getParent().isModuleBody());
decl.setJSDocInfo(mergedClassInfo);
block.addChildToBack(decl);
} else {
// example: ns.ctr = function(){}
Node assign =
IR.assign(cls.name.cloneTree(), cls.constructor.value)
.srcref(exprRoot)
.setJSDocInfo(cls.constructor.info);
JSDocInfo mergedClassInfo =
mergeJsDocFor(cls, exprRoot.getOnlyChild(), /* includeConstructorExport= */ true);
assign.setJSDocInfo(mergedClassInfo);
Node expr = IR.exprResult(assign).srcref(exprRoot);
block.addChildToBack(expr);
}
if (cls.superClass != null) {
// example: goog.inherits(ctr, superClass)
block.addChildToBack(
fixupSrcref(
IR.exprResult(
IR.call(
NodeUtil.newQName(compiler, "goog.inherits").srcrefTree(cls.superClass),
cls.name.cloneTree(),
cls.superClass.cloneTree())
.srcref(cls.superClass))));
}
for (MemberDefinition def : cls.staticProps) {
if (!def.value.isCast()) {
// remove the original jsdoc info if it was attached to the value.
def.value.setJSDocInfo(null);
}
// example: ctr.prop = value
block.addChildToBack(
fixupSrcref(IR.exprResult(
fixupSrcref(IR.assign(
IR.getprop(cls.name.cloneTree(),
IR.string(def.name.getString()).srcref(def.name))
.srcref(def.name),
def.value)).setJSDocInfo(def.info))));
// Handle inner class definitions.
maybeRewriteClassDefinition(t, block.getLastChild());
}
for (MemberDefinition def : cls.props) {
// remove the original jsdoc info if it was attached to the value.
def.value.setJSDocInfo(null);
// example: ctr.prototype.prop = value
Node exprResult =
IR.exprResult(
IR.assign(
NodeUtil.newQName(
compiler,
cls.name.getQualifiedName() + ".prototype." + def.name.getString()),
def.value)
.setJSDocInfo(def.info));
exprResult.useSourceInfoIfMissingFromForTree(def.name);
// The length needs to be set explicitly to include the string key node and the function node.
// If we just used the length of def.name or def.value alone, then refactorings which try to
// delete the method would not work correctly.
exprResult.setLength(
def.value.getSourceOffset() + def.value.getLength() - def.name.getSourceOffset());
block.addChildToBack(exprResult);
// Handle inner class definitions.
maybeRewriteClassDefinition(t, block.getLastChild());
}
if (cls.classModifier != null) {
// Inside the modifier function, replace references to the argument
// with the class name.
// function(cls) { cls.Foo = bar; }
// becomes
// function(cls) { theClassName.Foo = bar; }
// The cls parameter is unused, but leave it there so that it
// matches the JsDoc.
// TODO(tbreisacher): Add a warning if the param is shadowed or reassigned.
Node argList = cls.classModifier.getSecondChild();
Node arg = argList.getFirstChild();
final String argName = arg.getString();
NodeTraversal.traversePostOrder(
compiler,
cls.classModifier.getLastChild(),
(NodeTraversal unused, Node n, Node parent) -> {
if (n.isName() && n.getString().equals(argName)) {
Node newName = cls.name.cloneTree();
parent.replaceChild(n, newName);
compiler.reportChangeToEnclosingScope(newName);
}
});
block.addChildToBack(
IR.exprResult(
fixupFreeCall(
IR.call(
cls.classModifier,
cls.name.cloneTree())
.srcref(cls.classModifier)))
.srcref(cls.classModifier));
}
Node parent = exprRoot.getParent();
Node stmts = block.removeChildren();
parent.addChildrenAfter(stmts, exprRoot);
parent.removeChild(exprRoot);
// compiler.reportChangeToEnclosingScope(parent);
t.reportCodeChange();
}
private static Node fixupSrcref(Node node) {
node.srcref(node.getFirstChild());
return node;
}
private static Node fixupFreeCall(Node call) {
checkState(call.isCall());
call.putBooleanProp(Node.FREE_CALL, true);
return call;
}
/**
* @return Whether the call represents a class definition.
*/
static boolean isGoogDefineClass(Node value) {
if (value != null && value.isCall()) {
return value.getFirstChild().matchesQualifiedName("goog.defineClass");
}
return false;
}
static final String VIRTUAL_FILE = "";
private JSTypeExpression getSuperclassFor(Node superNode) {
final String superName;
if (superNode.isQualifiedName()) {
superName = superNode.getQualifiedName();
} else {
checkState(NodeUtil.isCallTo(superNode, "goog.module.get"));
superName = superNode.getLastChild().getString();
}
return new JSTypeExpression(
new Node(Token.BANG, IR.string(superName)).srcrefTree(superNode), VIRTUAL_FILE);
}
/**
* Merges the JSDoc from the class and constructor into a single function-level JSDoc
*
* @param includeConstructorExport if false, disregards the @export JSDoc from the constructor, if
* any. This is a workaround for b/138324343.
*/
private JSDocInfo mergeJsDocFor(
ClassDefinition cls, Node associatedNode, boolean includeConstructorExport) {
// avoid null checks
JSDocInfo classInfo =
(cls.classInfo != null) ? cls.classInfo : new JSDocInfoBuilder(true).build(true);
JSDocInfo ctorInfo =
(cls.constructor.info != null)
? cls.constructor.info
: new JSDocInfoBuilder(true).build(true);
Node superNode = cls.superClass;
// Start with a clone of the constructor info if there is one.
JSDocInfoBuilder mergedInfo =
cls.constructor.info != null
? JSDocInfoBuilder.copyFrom(ctorInfo)
: new JSDocInfoBuilder(true);
// Optionally, remove @export from the cloned constructor info.
// TODO(b/138324343): remove this case (or, even better, just delete goog.defineClass support).
if (!includeConstructorExport && ctorInfo.isExport()) {
mergedInfo.removeExport();
}
// merge block description
String blockDescription = Joiner.on("\n").skipNulls().join(
classInfo.getBlockDescription(),
ctorInfo.getBlockDescription());
if (!blockDescription.isEmpty()) {
mergedInfo.recordBlockDescription(blockDescription);
}
// merge suppressions
Set suppressions = new HashSet<>();
suppressions.addAll(classInfo.getSuppressions());
suppressions.addAll(ctorInfo.getSuppressions());
if (!suppressions.isEmpty()) {
mergedInfo.recordSuppressions(suppressions);
}
// Use class deprecation if set.
if (classInfo.isDeprecated()) {
mergedInfo.recordDeprecated();
}
String deprecationReason = null;
if (classInfo.getDeprecationReason() != null) {
deprecationReason = classInfo.getDeprecationReason();
mergedInfo.recordDeprecationReason(deprecationReason);
}
// Use class visibility if specifically set
Visibility visibility = classInfo.getVisibility();
if (visibility != null && visibility != JSDocInfo.Visibility.INHERITED) {
mergedInfo.recordVisibility(classInfo.getVisibility());
}
if (classInfo.isAbstract()) {
mergedInfo.recordAbstract();
}
if (classInfo.isConstant()) {
mergedInfo.recordConstancy();
}
if (classInfo.isExport()) {
mergedInfo.recordExport();
}
// If @ngInject is on the ctor, it's already been copied above.
if (classInfo.isNgInject()) {
compiler.report(JSError.make(associatedNode, GOOG_CLASS_NG_INJECT_ON_CLASS));
mergedInfo.recordNgInject(true);
}
if (classInfo.makesUnrestricted() || ctorInfo.makesUnrestricted()) {
mergedInfo.recordUnrestricted();
} else if (classInfo.makesDicts() || ctorInfo.makesDicts()) {
mergedInfo.recordDict();
} else {
// @struct by default
mergedInfo.recordStruct();
}
// @constructor is implied, @interface must be explicit
boolean isInterface = classInfo.isInterface() || ctorInfo.isInterface();
if (isInterface) {
if (classInfo.usesImplicitMatch() || ctorInfo.usesImplicitMatch()) {
mergedInfo.recordImplicitMatch();
} else {
mergedInfo.recordInterface();
}
List extendedInterfaces = null;
if (classInfo.getExtendedInterfacesCount() > 0) {
extendedInterfaces = classInfo.getExtendedInterfaces();
} else if (ctorInfo.getExtendedInterfacesCount() == 0
&& superNode != null) {
extendedInterfaces = ImmutableList.of(getSuperclassFor(superNode));
}
if (extendedInterfaces != null) {
for (JSTypeExpression extend : extendedInterfaces) {
mergedInfo.recordExtendedInterface(extend);
}
}
} else {
// @constructor by default
mergedInfo.recordConstructor();
if (classInfo.getBaseType() != null) {
mergedInfo.recordBaseType(classInfo.getBaseType());
} else if (superNode != null) {
// a "super" implies @extends, build a default.
JSTypeExpression baseType = getSuperclassFor(superNode);
mergedInfo.recordBaseType(baseType);
}
// @implements from the class if they exist
List interfaces = classInfo.getImplementedInterfaces();
for (JSTypeExpression implemented : interfaces) {
mergedInfo.recordImplementedInterface(implemented);
}
}
// merge @template types if they exist
ImmutableMap classTemplates = classInfo.getTemplateTypes();
ImmutableMap ctorTemplates = ctorInfo.getTemplateTypes();
for (Map.Entry entry : classTemplates.entrySet()) {
mergedInfo.recordTemplateTypeName(entry.getKey(), entry.getValue());
}
for (Map.Entry entry : ctorTemplates.entrySet()) {
mergedInfo.recordTemplateTypeName(entry.getKey(), entry.getValue());
}
return mergedInfo.build();
}
}
