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/*
* Copyright 2018 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 static com.google.javascript.jscomp.ClosureCheckModule.DECLARE_LEGACY_NAMESPACE_IN_NON_MODULE;
import static com.google.javascript.jscomp.ClosurePrimitiveErrors.INVALID_REQUIRE_NAMESPACE;
import com.google.common.collect.LinkedHashMultiset;
import com.google.javascript.jscomp.NodeTraversal.Callback;
import com.google.javascript.jscomp.deps.ModuleLoader.ModulePath;
import com.google.javascript.jscomp.deps.ModuleLoader.ResolutionMode;
import com.google.javascript.jscomp.modules.ModuleMetadataMap;
import com.google.javascript.jscomp.modules.ModuleMetadataMap.ModuleMetadata;
import com.google.javascript.jscomp.modules.ModuleMetadataMap.ModuleType;
import com.google.javascript.rhino.IR;
import com.google.javascript.rhino.Node;
import java.util.HashMap;
import java.util.Map;
import javax.annotation.Nullable;
/**
* Gathers metadata around modules that is useful for checking imports / requires and creates a
* {@link ModuleMetadataMap}.
*/
public final class GatherModuleMetadata implements HotSwapCompilerPass {
static final DiagnosticType MIXED_MODULE_TYPE =
DiagnosticType.error("JSC_MIXED_MODULE_TYPE", "A file cannot be both {0} and {1}.");
static final DiagnosticType INVALID_DECLARE_MODULE_ID_CALL =
DiagnosticType.error(
"JSC_INVALID_DECLARE_NAMESPACE_CALL",
"goog.declareModuleId parameter must be a string literal.");
static final DiagnosticType DECLARE_MODULE_ID_OUTSIDE_ES6_MODULE =
DiagnosticType.error(
"JSC_DECLARE_MODULE_NAMESPACE_OUTSIDE_ES6_MODULE",
"goog.declareModuleId can only be called within ES6 modules.");
static final DiagnosticType MULTIPLE_DECLARE_MODULE_NAMESPACE =
DiagnosticType.error(
"JSC_MULTIPLE_DECLARE_MODULE_NAMESPACE",
"goog.declareModuleId can only be called once per ES6 module.");
static final DiagnosticType INVALID_REQUIRE_TYPE =
DiagnosticType.error(
"JSC_INVALID_REQUIRE_TYPE", "Argument to goog.requireType must be a string.");
static final DiagnosticType INVALID_SET_TEST_ONLY =
DiagnosticType.error(
"JSC_INVALID_SET_TEST_ONLY",
"Optional, single argument to goog.setTestOnly must be a string.");
private static final Node GOOG_PROVIDE = IR.getprop(IR.name("goog"), IR.string("provide"));
private static final Node GOOG_MODULE = IR.getprop(IR.name("goog"), IR.string("module"));
private static final Node GOOG_REQUIRE = IR.getprop(IR.name("goog"), IR.string("require"));
private static final Node GOOG_REQUIRE_TYPE =
IR.getprop(IR.name("goog"), IR.string("requireType"));
private static final Node GOOG_SET_TEST_ONLY =
IR.getprop(IR.name("goog"), IR.string("setTestOnly"));
private static final Node GOOG_MODULE_DECLARELEGACYNAMESPACE =
IR.getprop(GOOG_MODULE.cloneTree(), IR.string("declareLegacyNamespace"));
private static final Node GOOG_DECLARE_MODULE_ID =
IR.getprop(IR.name("goog"), IR.string("declareModuleId"));
// TODO(johnplaisted): Remove once clients have migrated to declareModuleId
private static final Node GOOG_MODULE_DECLARNAMESPACE =
IR.getprop(GOOG_MODULE.cloneTree(), IR.string("declareNamespace"));
/**
* Map from module path to module. These modules represent files and thus will contain all goog
* namespaces that are in the file. These are not the same modules in modulesByGoogNamespace.
*/
private final Map modulesByPath = new HashMap<>();
/**
* Map from Closure namespace to module. These modules represent just the single namespace and
* thus each module has only one goog namespace in its {@link ModuleMetadata#googNamespaces()}.
* These are not the same modules in modulesByPath.
*/
private final Map modulesByGoogNamespace = new HashMap<>();
/** The current module being traversed. */
private ModuleMetadataBuilder currentModule;
/**
* The module currentModule is nested under, if any. Modules are expected to be at most two deep
* (a script and then a goog.loadModule call).
*/
private ModuleMetadataBuilder parentModule;
/** The call to goog.loadModule we are traversing. */
private Node loadModuleCall;
private final AbstractCompiler compiler;
private final boolean processCommonJsModules;
private final ResolutionMode moduleResolutionMode;
public GatherModuleMetadata(
AbstractCompiler compiler,
boolean processCommonJsModules,
ResolutionMode moduleResolutionMode) {
this.compiler = compiler;
this.processCommonJsModules = processCommonJsModules;
this.moduleResolutionMode = moduleResolutionMode;
}
private class ModuleMetadataBuilder {
private boolean ambiguous;
private boolean hasModuleBody;
private Node declaredModuleId;
private Node declaresLegacyNamespace;
final ModuleMetadata.Builder metadataBuilder;
LinkedHashMultiset googNamespaces = LinkedHashMultiset.create();
ModuleMetadataBuilder(Node rootNode, @Nullable ModulePath path) {
this.metadataBuilder =
ModuleMetadata.builder()
.path(path)
.rootNode(rootNode)
.moduleType(ModuleType.SCRIPT)
.usesClosure(false)
.isTestOnly(false);
}
void moduleType(ModuleType type, NodeTraversal t, Node n) {
checkNotNull(type);
if (metadataBuilder.moduleType() == type) {
return;
}
if (metadataBuilder.moduleType() == ModuleType.SCRIPT) {
metadataBuilder.moduleType(type);
return;
}
ambiguous = true;
t.report(n, MIXED_MODULE_TYPE, metadataBuilder.moduleType().description, type.description);
}
void recordDeclareModuleId(Node declaredModuleId) {
this.declaredModuleId = declaredModuleId;
}
void recordDeclareLegacyNamespace(Node declaresLegacyNamespace) {
this.declaresLegacyNamespace = declaresLegacyNamespace;
}
boolean isScript() {
return metadataBuilder.moduleType() == ModuleType.SCRIPT;
}
ModuleMetadata build() {
metadataBuilder.googNamespacesBuilder().addAll(googNamespaces);
if (!ambiguous) {
if (hasModuleBody && metadataBuilder.moduleType() == ModuleType.SCRIPT) {
// A script with no imports or exports, but has a module body, must be an ES module.
metadataBuilder.moduleType(ModuleType.ES6_MODULE);
}
if (declaredModuleId != null && metadataBuilder.moduleType() != ModuleType.ES6_MODULE) {
compiler.report(JSError.make(declaredModuleId, DECLARE_MODULE_ID_OUTSIDE_ES6_MODULE));
}
if (declaresLegacyNamespace != null) {
if (metadataBuilder.moduleType() == ModuleType.GOOG_MODULE) {
metadataBuilder.moduleType(ModuleType.LEGACY_GOOG_MODULE);
} else {
compiler.report(
JSError.make(declaresLegacyNamespace, DECLARE_LEGACY_NAMESPACE_IN_NON_MODULE));
}
}
}
return metadataBuilder.build();
}
}
/** Traverses the AST and build a sets of {@link ModuleMetadata}s. */
private final class Finder implements Callback {
@Override
public boolean shouldTraverse(NodeTraversal t, Node n, Node parent) {
switch (n.getToken()) {
case SCRIPT:
enterModule(n, t.getInput().getPath());
break;
case IMPORT:
case EXPORT:
visitImportOrExport(t, n);
break;
case CALL:
if (n.isCall() && n.getFirstChild().matchesQualifiedName("goog.loadModule")) {
loadModuleCall = n;
enterModule(n, null);
}
break;
case MODULE_BODY:
currentModule.hasModuleBody = true;
break;
default:
break;
}
return true;
}
private void visitImportOrExport(NodeTraversal t, Node importOrExport) {
checkNotNull(currentModule);
currentModule.moduleType(ModuleType.ES6_MODULE, t, importOrExport);
if (importOrExport.isImport()
// export from
|| (importOrExport.hasTwoChildren() && importOrExport.getLastChild().isString())) {
currentModule
.metadataBuilder
.es6ImportSpecifiersBuilder()
.add(importOrExport.getLastChild().getString());
}
}
private void enterModule(Node n, @Nullable ModulePath path) {
ModuleMetadataBuilder newModule = new ModuleMetadataBuilder(n, path);
if (currentModule != null) {
checkState(parentModule == null, "Expected modules to be nested at most 2 deep.");
parentModule = currentModule;
}
currentModule = newModule;
}
private void leaveModule() {
checkNotNull(currentModule);
ModuleMetadata module = currentModule.build();
if (module.path() != null) {
modulesByPath.put(module.path().toString(), module);
}
for (String namespace : module.googNamespaces()) {
modulesByGoogNamespace.put(namespace, module);
}
if (parentModule != null) {
parentModule.metadataBuilder.nestedModulesBuilder().add(module);
}
currentModule = parentModule;
parentModule = null;
}
@Override
public void visit(NodeTraversal t, Node n, Node parent) {
if (processCommonJsModules && currentModule != null && currentModule.isScript()) {
// A common JS import (call to "require") does not force a module to be rewritten as
// commonJS. Only an export statement.
if (ProcessCommonJSModules.isCommonJsExport(t, n, moduleResolutionMode)) {
currentModule.moduleType(ModuleType.COMMON_JS, t, n);
return;
}
}
switch (n.getToken()) {
case SCRIPT:
leaveModule();
break;
case NAME:
visitName(t, n);
break;
case CALL:
if (loadModuleCall == n) {
leaveModule();
loadModuleCall = null;
} else {
visitGoogCall(t, n);
}
break;
default:
break;
}
}
private boolean isFromGoogImport(Var goog) {
Node nameNode = goog.getNameNode();
// Because other tools are regex based we force importing this file as "import * as goog".
return nameNode != null
&& nameNode.isImportStar()
&& nameNode.getString().equals("goog")
&& nameNode.getParent().getFirstChild().isEmpty()
&& nameNode.getParent().getLastChild().getString().endsWith("/goog.js");
}
private void visitName(NodeTraversal t, Node n) {
if (!"goog".equals(n.getString())) {
return;
}
Var root = t.getScope().getVar("goog");
if (root != null && !isFromGoogImport(root)) {
return;
}
currentModule.metadataBuilder.usesClosure(true);
}
private void visitGoogCall(NodeTraversal t, Node n) {
if (!n.hasChildren()
|| !n.getFirstChild().isGetProp()
|| !n.getFirstChild().isQualifiedName()) {
return;
}
Node getprop = n.getFirstChild();
Node firstProp = n.getFirstChild();
while (firstProp.isGetProp()) {
firstProp = firstProp.getFirstChild();
}
if (!firstProp.isName() || !firstProp.getString().equals("goog")) {
return;
}
Var root = t.getScope().getVar("goog");
// If this is a locally defined variable it can't be the global "goog", so exit early.
if (root != null && root.isLocal() && !root.getScope().isModuleScope()) {
return;
}
// If this is a module-level variable but wasn't created by importing goog.js, return.
if (root != null && root.getScope().isModuleScope() && !isFromGoogImport(root)) {
return;
}
// If goog is defined in this script then it does not use Closure. If this is a bundle with
// base.js in it, then it doesn't need base.js again.
if (root == null
|| NodeUtil.getEnclosingScript(root.getNameNode()) != NodeUtil.getEnclosingScript(n)) {
currentModule.metadataBuilder.usesClosure(true);
}
if (getprop.matchesQualifiedName(GOOG_PROVIDE)) {
currentModule.moduleType(ModuleType.GOOG_PROVIDE, t, n);
if (n.hasTwoChildren() && n.getLastChild().isString()) {
String namespace = n.getLastChild().getString();
addNamespace(currentModule, namespace, t, n);
} else {
t.report(n, ClosureRewriteModule.INVALID_PROVIDE_NAMESPACE);
}
} else if (getprop.matchesQualifiedName(GOOG_MODULE)) {
currentModule.moduleType(ModuleType.GOOG_MODULE, t, n);
if (n.hasTwoChildren() && n.getLastChild().isString()) {
String namespace = n.getLastChild().getString();
addNamespace(currentModule, namespace, t, n);
} else {
t.report(n, ClosureRewriteModule.INVALID_MODULE_NAMESPACE);
}
} else if (getprop.matchesQualifiedName(GOOG_MODULE_DECLARELEGACYNAMESPACE)) {
currentModule.recordDeclareLegacyNamespace(n);
} else if (getprop.matchesQualifiedName(GOOG_DECLARE_MODULE_ID)
|| getprop.matchesQualifiedName(GOOG_MODULE_DECLARNAMESPACE)) {
if (currentModule.declaredModuleId != null) {
t.report(n, MULTIPLE_DECLARE_MODULE_NAMESPACE);
}
if (n.hasTwoChildren() && n.getLastChild().isString()) {
currentModule.recordDeclareModuleId(n);
String namespace = n.getLastChild().getString();
addNamespace(currentModule, namespace, t, n);
} else {
t.report(n, INVALID_DECLARE_MODULE_ID_CALL);
}
} else if (getprop.matchesQualifiedName(GOOG_REQUIRE)) {
if (n.hasTwoChildren() && n.getLastChild().isString()) {
currentModule
.metadataBuilder
.stronglyRequiredGoogNamespacesBuilder()
.add(n.getLastChild().getString());
} else {
t.report(n, INVALID_REQUIRE_NAMESPACE);
}
} else if (getprop.matchesQualifiedName(GOOG_REQUIRE_TYPE)) {
if (n.hasTwoChildren() && n.getLastChild().isString()) {
currentModule
.metadataBuilder
.weaklyRequiredGoogNamespacesBuilder()
.add(n.getLastChild().getString());
} else {
t.report(n, INVALID_REQUIRE_TYPE);
}
} else if (getprop.matchesQualifiedName(GOOG_SET_TEST_ONLY)) {
if (n.hasOneChild() || (n.hasTwoChildren() && n.getLastChild().isString())) {
currentModule.metadataBuilder.isTestOnly(true);
} else {
t.report(n, INVALID_SET_TEST_ONLY);
}
}
}
/**
* Adds the namespaces to the module and checks if the given Closure namespace is a duplicate or
* not.
*/
private void addNamespace(
ModuleMetadataBuilder module, String namespace, NodeTraversal t, Node n) {
ModuleType existingType = null;
String existingFileSource = null;
if (module.googNamespaces.contains(namespace)) {
existingType = module.metadataBuilder.moduleType();
existingFileSource = t.getSourceName();
} else {
ModuleMetadata existingModule = modulesByGoogNamespace.get(namespace);
if (existingModule != null) {
existingType = existingModule.moduleType();
existingFileSource = existingModule.rootNode().getSourceFileName();
}
}
currentModule.googNamespaces.add(namespace);
if (existingType != null) {
switch (existingType) {
case ES6_MODULE:
case GOOG_MODULE:
case LEGACY_GOOG_MODULE:
t.report(n, ClosurePrimitiveErrors.DUPLICATE_MODULE, namespace, existingFileSource);
return;
case GOOG_PROVIDE:
t.report(n, ClosurePrimitiveErrors.DUPLICATE_NAMESPACE, namespace, existingFileSource);
return;
case COMMON_JS:
case SCRIPT:
// Fall through, error
}
throw new IllegalStateException("Unexpected module type: " + existingType);
}
}
}
@Override
public void process(Node externs, Node root) {
NodeTraversal.traverse(compiler, externs, new Finder());
NodeTraversal.traverse(compiler, root, new Finder());
compiler.setModuleMetadataMap(new ModuleMetadataMap(modulesByPath, modulesByGoogNamespace));
}
@Override
public void hotSwapScript(Node scriptRoot, Node originalRoot) {
// This pass is run as either a hot swap or full pass. So if we're running in hot swap this is
// a different instance from the full pass, and we need to populate these again.
modulesByPath.putAll(compiler.getModuleMetadataMap().getModulesByPath());
modulesByGoogNamespace.putAll(compiler.getModuleMetadataMap().getModulesByGoogNamespace());
ModuleMetadata oldMetadata =
modulesByPath.remove(compiler.getInput(originalRoot.getInputId()).getPath().toString());
if (oldMetadata != null) {
modulesByGoogNamespace.keySet().removeAll(oldMetadata.googNamespaces());
for (ModuleMetadata nestedMetadata : oldMetadata.nestedModules()) {
modulesByGoogNamespace.keySet().removeAll(nestedMetadata.googNamespaces());
}
}
NodeTraversal.traverse(compiler, scriptRoot, new Finder());
compiler.setModuleMetadataMap(new ModuleMetadataMap(modulesByPath, modulesByGoogNamespace));
}
}
