com.google.javascript.jscomp.JSModuleGraph Maven / Gradle / Ivy
/*
* Copyright 2008 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 java.lang.Math.max;
import static java.lang.Math.min;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Joiner;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import com.google.common.collect.LinkedListMultimap;
import com.google.common.collect.ListMultimap;
import com.google.common.collect.Ordering;
import com.google.gson.JsonArray;
import com.google.gson.JsonObject;
import com.google.gson.JsonPrimitive;
import com.google.javascript.jscomp.deps.Es6SortedDependencies;
import com.google.javascript.jscomp.deps.SortedDependencies;
import com.google.javascript.jscomp.deps.SortedDependencies.MissingProvideException;
import com.google.javascript.jscomp.graph.LinkedDirectedGraph;
import com.google.javascript.jscomp.parsing.parser.util.format.SimpleFormat;
import com.google.javascript.rhino.StaticSourceFile.SourceKind;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.BitSet;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.IdentityHashMap;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.annotation.Nullable;
/**
* A {@link JSModule} dependency graph that assigns a depth to each module and can answer
* depth-related queries about them. For the purposes of this class, a module's depth is defined as
* the number of hops in the longest (non cyclic) path from the module to a module with no
* dependencies.
*/
public final class JSModuleGraph implements Serializable {
static final DiagnosticType WEAK_FILE_REACHABLE_FROM_ENTRY_POINT_ERROR =
DiagnosticType.error(
"JSC_WEAK_FILE_REACHABLE_FROM_ENTRY_POINT_ERROR",
"File strongly reachable from an entry point must not be weak: {0}");
static final DiagnosticType EXPLICIT_WEAK_ENTRY_POINT_ERROR =
DiagnosticType.error(
"JSC_EXPLICIT_WEAK_ENTRY_POINT_ERROR",
"Explicit entry point input must not be weak: {0}");
static final DiagnosticType IMPLICIT_WEAK_ENTRY_POINT_ERROR =
DiagnosticType.warning(
"JSC_IMPLICIT_WEAK_ENTRY_POINT_ERROR",
"Implicit entry point input should not be weak: {0}");
private final JSModule[] modules;
/**
* selfPlusTransitiveDeps[i] = indices of all modules that modules[i] depends on, including
* itself.
*/
private final BitSet[] selfPlusTransitiveDeps;
/**
* subtreeSize[i] = Number of modules that transitively depend on modules[i], including itself.
*/
private final int[] subtreeSize;
/**
* Lists of modules at each depth. modulesByDepth.get(3) is a list of the modules at
* depth 3, for example.
*/
private final List> modulesByDepth;
/**
* dependencyMap is a cache of dependencies that makes the dependsOn function faster. Each map
* entry associates a starting JSModule with the set of JSModules that are transitively dependent
* on the starting module.
*
* If the cache returns null, then the entry hasn't been filled in for that module.
*
*
NOTE: JSModule has identity semantics so this map implementation is safe
*/
private final Map> dependencyMap = new IdentityHashMap<>();
/** Creates a module graph from a list of modules in dependency order. */
public JSModuleGraph(JSModule[] modulesInDepOrder) {
this(Arrays.asList(modulesInDepOrder));
}
/** Creates a module graph from a list of modules in dependency order. */
public JSModuleGraph(List modulesInDepOrder) {
Preconditions.checkState(!modulesInDepOrder.isEmpty());
modulesInDepOrder = makeWeakModule(modulesInDepOrder);
modules = new JSModule[modulesInDepOrder.size()];
// n = number of modules
// Populate modules O(n)
for (int moduleIndex = 0; moduleIndex < modules.length; ++moduleIndex) {
final JSModule module = modulesInDepOrder.get(moduleIndex);
checkState(module.getIndex() == -1, "Module index already set: %s", module);
module.setIndex(moduleIndex);
modules[moduleIndex] = module;
}
// Determine depth for all modules.
// m = number of edges in the graph
// O(n*m)
modulesByDepth = initModulesByDepth();
// Determine transitive deps for all modules.
// O(n*m * log(n)) (probably a bit better than that)
selfPlusTransitiveDeps = initTransitiveDepsBitSets();
// O(n*m)
subtreeSize = initSubtreeSize();
// Move all sources marked as weak by outside sources (e.g. flags) into the weak module.
moveMarkedWeakSources(getModuleByName(JSModule.WEAK_MODULE_NAME), getAllInputs());
}
private List> initModulesByDepth() {
final List> tmpModulesByDepth = new ArrayList<>();
for (int moduleIndex = 0; moduleIndex < modules.length; ++moduleIndex) {
final JSModule module = modules[moduleIndex];
checkState(module.getDepth() == -1, "Module depth already set: %s", module);
int depth = 0;
for (JSModule dep : module.getDependencies()) {
int depDepth = dep.getDepth();
if (depDepth < 0) {
throw new ModuleDependenceException(SimpleFormat.format(
"Modules not in dependency order: %s preceded %s",
module.getName(), dep.getName()),
module, dep);
}
depth = max(depth, depDepth + 1);
}
module.setDepth(depth);
if (depth == tmpModulesByDepth.size()) {
tmpModulesByDepth.add(new ArrayList());
}
tmpModulesByDepth.get(depth).add(module);
}
return tmpModulesByDepth;
}
/**
* If a weak module doesn't already exist, creates a weak module depending on every other module.
*
* Does not move any sources into the weak module.
*
* @return a new list of modules that includes the weak module, if it was newly created, or the
* same list if the weak module already existed
* @throws IllegalStateException if a weak module already exists but doesn't fulfill the above
* conditions
*/
private List makeWeakModule(List modulesInDepOrder) {
boolean hasWeakModule = false;
for (JSModule module : modulesInDepOrder) {
if (module.getName().equals(JSModule.WEAK_MODULE_NAME)) {
hasWeakModule = true;
Set allOtherModules = new HashSet<>(modulesInDepOrder);
allOtherModules.remove(module);
checkState(
module.getAllDependencies().containsAll(allOtherModules),
"A weak module already exists but it does not depend on every other module.");
checkState(
module.getAllDependencies().size() == allOtherModules.size(),
"The weak module cannot have extra dependencies.");
break;
}
}
if (hasWeakModule) {
// All weak files (and only weak files) should be in the weak module.
List misplacedWeakFiles = new ArrayList<>();
List misplacedStrongFiles = new ArrayList<>();
for (JSModule module : modulesInDepOrder) {
boolean isWeakModule = module.getName().equals(JSModule.WEAK_MODULE_NAME);
for (CompilerInput input : module.getInputs()) {
if (isWeakModule && !input.getSourceFile().isWeak()) {
misplacedStrongFiles.add(input.getSourceFile().getName());
} else if (!isWeakModule && input.getSourceFile().isWeak()) {
misplacedWeakFiles.add(
input.getSourceFile().getName() + " (in module " + module.getName() + ")");
}
}
}
if (!(misplacedStrongFiles.isEmpty() && misplacedWeakFiles.isEmpty())) {
StringBuilder sb =
new StringBuilder("A weak module exists but some sources are misplaced.");
if (!misplacedStrongFiles.isEmpty()) {
sb.append("\nFound these strong sources in the weak module:\n ")
.append(Joiner.on("\n ").join(misplacedStrongFiles));
}
if (!misplacedWeakFiles.isEmpty()) {
sb.append("\nFound these weak sources in other modules:\n ")
.append(Joiner.on("\n ").join(misplacedWeakFiles));
}
throw new IllegalStateException(sb.toString());
}
} else {
JSModule weakModule = new JSModule(JSModule.WEAK_MODULE_NAME);
for (JSModule module : modulesInDepOrder) {
weakModule.addDependency(module);
}
modulesInDepOrder = new ArrayList<>(modulesInDepOrder);
modulesInDepOrder.add(weakModule);
}
return modulesInDepOrder;
}
private BitSet[] initTransitiveDepsBitSets() {
BitSet[] array = new BitSet[modules.length];
for (int moduleIndex = 0; moduleIndex < modules.length; ++moduleIndex) {
final JSModule module = modules[moduleIndex];
BitSet selfPlusTransitiveDeps = new BitSet(moduleIndex + 1);
array[moduleIndex] = selfPlusTransitiveDeps;
selfPlusTransitiveDeps.set(moduleIndex);
// O(moduleIndex * log64(moduleIndex))
for (JSModule dep : module.getDependencies()) {
// Add this dependency and all of its dependencies to the current module.
// O(log64(moduleIndex))
selfPlusTransitiveDeps.or(array[dep.getIndex()]);
}
}
return array;
}
private int[] initSubtreeSize() {
int[] subtreeSize = new int[modules.length];
for (int dependentIndex = 0; dependentIndex < modules.length; ++dependentIndex) {
BitSet dependencies = selfPlusTransitiveDeps[dependentIndex];
// Iterating backward through the bitset is slightly more efficient, since it avoids
// considering later modules, which this one cannot depend on.
for (int requiredIndex = dependentIndex;
requiredIndex >= 0;
requiredIndex = dependencies.previousSetBit(requiredIndex - 1)) {
subtreeSize[requiredIndex] += 1; // Count dependent in required module's subtree.
}
}
return subtreeSize;
}
/** Gets an iterable over all input source files in dependency order. */
Iterable getAllInputs() {
return Iterables.concat(Iterables.transform(Arrays.asList(modules), JSModule::getInputs));
}
/** Gets the total number of input source files. */
int getInputCount() {
int count = 0;
for (JSModule module : modules) {
count += module.getInputCount();
}
return count;
}
/**
* Gets an iterable over all modules in dependency order.
*/
Iterable getAllModules() {
return Arrays.asList(modules);
}
/**
* Gets a single module by name.
*
* @return The module, or null if no such module exists.
*/
@Nullable
JSModule getModuleByName(String name) {
for (JSModule m : modules) {
if (m.getName().equals(name)) {
return m;
}
}
return null;
}
/**
* Gets all modules indexed by name.
*/
Map getModulesByName() {
Map result = new HashMap<>();
for (JSModule m : modules) {
result.put(m.getName(), m);
}
return result;
}
/**
* Gets the total number of modules.
*/
int getModuleCount() {
return modules.length;
}
/**
* Gets the root module.
*/
JSModule getRootModule() {
return Iterables.getOnlyElement(modulesByDepth.get(0));
}
/**
* Returns a JSON representation of the JSModuleGraph. Specifically a
* JsonArray of "Modules" where each module has a
* - "name"
* - "dependencies" (list of module names)
* - "transitive-dependencies" (list of module names, deepest first)
* - "inputs" (list of file names)
* @return List of module JSONObjects.
*/
@GwtIncompatible("com.google.gson")
JsonArray toJson() {
JsonArray modules = new JsonArray();
for (JSModule module : getAllModules()) {
JsonObject node = new JsonObject();
node.add("name", new JsonPrimitive(module.getName()));
JsonArray deps = new JsonArray();
node.add("dependencies", deps);
for (JSModule m : module.getDependencies()) {
deps.add(new JsonPrimitive(m.getName()));
}
JsonArray transitiveDeps = new JsonArray();
node.add("transitive-dependencies", transitiveDeps);
for (JSModule m : getTransitiveDepsDeepestFirst(module)) {
transitiveDeps.add(new JsonPrimitive(m.getName()));
}
JsonArray inputs = new JsonArray();
node.add("inputs", inputs);
for (CompilerInput input : module.getInputs()) {
inputs.add(new JsonPrimitive(
input.getSourceFile().getOriginalPath()));
}
modules.add(node);
}
return modules;
}
/**
* Determines whether this module depends on a given module. Note that a
* module never depends on itself, as that dependency would be cyclic.
*/
public boolean dependsOn(JSModule src, JSModule m) {
return src != m && selfPlusTransitiveDeps[src.getIndex()].get(m.getIndex());
}
/**
* Finds the module with the fewest transitive dependents on which all of the given modules depend
* and that is a subtree of the given parent module tree.
*
* If no such subtree can be found, the parent module is returned.
*
*
If multiple candidates have the same number of dependents, the module farthest down in the
* total ordering of modules will be chosen.
*
* @param parentTree module on which the result must depend
* @param dependentModules indices of modules to consider
* @return A module on which all of the argument modules depend
*/
public JSModule getSmallestCoveringSubtree(JSModule parentTree, BitSet dependentModules) {
checkState(!dependentModules.isEmpty());
// Candidate modules are those that all of the given dependent modules depend on, including
// themselves. The dependent module with the smallest index might be our answer, if all
// the other modules depend on it.
int minDependentModuleIndex = modules.length;
final BitSet candidates = new BitSet(modules.length);
candidates.set(0, modules.length, true);
for (int dependentIndex = dependentModules.nextSetBit(0);
dependentIndex >= 0;
dependentIndex = dependentModules.nextSetBit(dependentIndex + 1)) {
minDependentModuleIndex = min(minDependentModuleIndex, dependentIndex);
candidates.and(selfPlusTransitiveDeps[dependentIndex]);
}
checkState(
!candidates.isEmpty(), "No common dependency found for %s", dependentModules);
// All candidates must have an index <= the smallest dependent module index.
// Work backwards through the candidates starting with the dependent module with the smallest
// index. For each candidate, we'll remove all of the modules it depends on from consideration,
// since they must all have larger subtrees than the one we're considering.
int parentTreeIndex = parentTree.getIndex();
// default to parent tree if we don't find anything better
int bestCandidateIndex = parentTreeIndex;
for (int candidateIndex = candidates.previousSetBit(minDependentModuleIndex);
candidateIndex >= 0;
candidateIndex = candidates.previousSetBit(candidateIndex - 1)) {
BitSet candidatePlusTransitiveDeps = selfPlusTransitiveDeps[candidateIndex];
if (candidatePlusTransitiveDeps.get(parentTreeIndex)) {
// candidate is a subtree of parentTree
candidates.andNot(candidatePlusTransitiveDeps);
if (subtreeSize[candidateIndex] < subtreeSize[bestCandidateIndex]) {
bestCandidateIndex = candidateIndex;
}
} // eliminate candidates that are not a subtree of parentTree
}
return modules[bestCandidateIndex];
}
/**
* Finds the deepest common dependency of two modules, not including the two
* modules themselves.
*
* @param m1 A module in this graph
* @param m2 A module in this graph
* @return The deepest common dep of {@code m1} and {@code m2}, or null if
* they have no common dependencies
*/
JSModule getDeepestCommonDependency(JSModule m1, JSModule m2) {
int m1Depth = m1.getDepth();
int m2Depth = m2.getDepth();
// According our definition of depth, the result must have a strictly
// smaller depth than either m1 or m2.
for (int depth = min(m1Depth, m2Depth) - 1; depth >= 0; depth--) {
List modulesAtDepth = modulesByDepth.get(depth);
// Look at the modules at this depth in reverse order, so that we use the
// original ordering of the modules to break ties (later meaning deeper).
for (int i = modulesAtDepth.size() - 1; i >= 0; i--) {
JSModule m = modulesAtDepth.get(i);
if (dependsOn(m1, m) && dependsOn(m2, m)) {
return m;
}
}
}
return null;
}
/**
* Finds the deepest common dependency of two modules, including the
* modules themselves.
*
* @param m1 A module in this graph
* @param m2 A module in this graph
* @return The deepest common dep of {@code m1} and {@code m2}, or null if
* they have no common dependencies
*/
public JSModule getDeepestCommonDependencyInclusive(
JSModule m1, JSModule m2) {
if (m2 == m1 || dependsOn(m2, m1)) {
return m1;
} else if (dependsOn(m1, m2)) {
return m2;
}
return getDeepestCommonDependency(m1, m2);
}
/** Returns the deepest common dependency of the given modules. */
public JSModule getDeepestCommonDependencyInclusive(
Collection modules) {
Iterator iter = modules.iterator();
JSModule dep = iter.next();
while (iter.hasNext()) {
dep = getDeepestCommonDependencyInclusive(dep, iter.next());
}
return dep;
}
/**
* Creates an iterable over the transitive dependencies of module {@code m}
* in a non-increasing depth ordering. The result does not include the module
* {@code m}.
*
* @param m A module in this graph
* @return The transitive dependencies of module {@code m}
*/
@VisibleForTesting
List getTransitiveDepsDeepestFirst(JSModule m) {
return InverseDepthComparator.INSTANCE.sortedCopy(getTransitiveDeps(m));
}
/** Returns the transitive dependencies of the module. */
private Set getTransitiveDeps(JSModule m) {
Set deps = dependencyMap.computeIfAbsent(m, JSModule::getAllDependencies);
return deps;
}
/**
* Moves all sources that have {@link SourceKind#WEAK} into the weak module so that they may be
* pruned later.
*/
private static void moveMarkedWeakSources(JSModule weakModule, Iterable inputs) {
checkNotNull(weakModule);
ImmutableList allInputs = ImmutableList.copyOf(inputs);
for (CompilerInput i : allInputs) {
if (i.getSourceFile().isWeak()) {
JSModule existingModule = i.getModule();
if (existingModule == weakModule) {
continue;
}
if (existingModule != null) {
existingModule.remove(i);
}
weakModule.add(i);
}
}
}
/**
* Apply the dependency options to the list of sources, returning a new source list re-ordering
* and dropping files as necessary. This module graph will be updated to reflect the new list.
*
* See {@link DependencyOptions} for more information on how this works.
*
* @throws MissingProvideException if an entry point was not provided by any of the inputs.
*/
public ImmutableList manageDependencies(
AbstractCompiler compiler, DependencyOptions dependencyOptions)
throws MissingProvideException, MissingModuleException {
// Make a copy since we're going to mutate the graph below.
List originalInputs = ImmutableList.copyOf(getAllInputs());
SortedDependencies sorter = new Es6SortedDependencies<>(originalInputs);
Set entryPointInputs =
createEntryPointInputs(compiler, dependencyOptions, getAllInputs(), sorter);
// Build a map of symbols to their source file(s). While having multiple source files is invalid
// we leave that up to typechecking so that we avoid arbitarily picking a file.
HashMap> inputsByProvide = new HashMap<>();
for (CompilerInput input : originalInputs) {
for (String provide : input.getKnownProvides()) {
inputsByProvide.computeIfAbsent(provide, (String k) -> new LinkedHashSet<>());
inputsByProvide.get(provide).add(input);
}
String moduleName = input.getPath().toModuleName();
inputsByProvide.computeIfAbsent(moduleName, (String k) -> new LinkedHashSet<>());
inputsByProvide.get(moduleName).add(input);
}
// Dynamically imported files must be added to the module graph, but
// they should not be ordered ahead of the files that import them.
// We add them as entry points to ensure they get included.
for (CompilerInput input : originalInputs) {
for (String require : input.getDynamicRequires()) {
if (inputsByProvide.containsKey(require)) {
entryPointInputs.addAll(inputsByProvide.get(require));
}
}
}
// The order of inputs, sorted independently of modules.
List absoluteOrder =
sorter.getStrongDependenciesOf(originalInputs, dependencyOptions.shouldSort());
// Figure out which sources *must* be in each module.
ListMultimap entryPointInputsPerModule =
LinkedListMultimap.create();
for (CompilerInput input : entryPointInputs) {
JSModule module = input.getModule();
checkNotNull(module);
entryPointInputsPerModule.put(module, input);
}
// Clear the modules of their inputs. This also nulls out the input's reference to its module.
for (JSModule module : getAllModules()) {
module.removeAll();
}
// Figure out which sources *must* be in each module, or in one
// of that module's dependencies.
List orderedInputs = new ArrayList<>();
Set reachedInputs = new HashSet<>();
for (JSModule module : entryPointInputsPerModule.keySet()) {
List transitiveClosure;
// Prefer a depth first ordering of dependencies from entry points.
// Always orders in a deterministic fashion regardless of the order of provided inputs
// given the same entry points in the same order.
if (dependencyOptions.shouldSort() && dependencyOptions.shouldPrune()) {
transitiveClosure = new ArrayList<>();
// We need the ful set of dependencies for each module, so start with the full input set
Set inputsNotYetReached = new HashSet<>(originalInputs);
for (CompilerInput entryPoint : entryPointInputsPerModule.get(module)) {
transitiveClosure.addAll(
getDepthFirstDependenciesOf(entryPoint, inputsNotYetReached, inputsByProvide));
}
// For any input we have not yet reached, add them to the ordered list
for (CompilerInput orderedInput : transitiveClosure) {
if (reachedInputs.add(orderedInput)) {
orderedInputs.add(orderedInput);
}
}
} else {
// Simply order inputs so that any required namespace comes before it's usage.
// Ordered result varies based on the original order of inputs.
transitiveClosure =
sorter.getStrongDependenciesOf(
entryPointInputsPerModule.get(module), dependencyOptions.shouldSort());
}
for (CompilerInput input : transitiveClosure) {
if (dependencyOptions.shouldPrune()
&& input.getSourceFile().isWeak()
&& !entryPointInputs.contains(input)) {
compiler.report(
JSError.make(
WEAK_FILE_REACHABLE_FROM_ENTRY_POINT_ERROR, input.getSourceFile().getName()));
}
JSModule oldModule = input.getModule();
if (oldModule == null) {
input.setModule(module);
} else {
input.setModule(null);
input.setModule(
getDeepestCommonDependencyInclusive(oldModule, module));
}
}
}
if (!(dependencyOptions.shouldSort() && dependencyOptions.shouldPrune())
|| entryPointInputsPerModule.isEmpty()) {
orderedInputs = absoluteOrder;
}
JSModule weakModule = getModuleByName(JSModule.WEAK_MODULE_NAME);
checkNotNull(weakModule);
// Mark all sources that are detected as weak.
if (dependencyOptions.shouldPrune()) {
List weakInputs = sorter.getSortedWeakDependenciesOf(orderedInputs);
for (CompilerInput i : weakInputs) {
// Add weak inputs to the weak module in dependency order. moveMarkedWeakSources will move
// in command line flag order.
checkState(i.getModule() == null);
i.getSourceFile().setKind(SourceKind.WEAK);
i.setModule(weakModule);
weakModule.add(i);
}
} else {
// Only move sourced marked as weak if the compiler isn't doing its own detection.
moveMarkedWeakSources(weakModule, originalInputs);
}
// All the inputs are pointing to the modules that own them. Yeah!
// Update the modules to reflect this.
for (CompilerInput input : orderedInputs) {
JSModule module = input.getModule();
if (module != null && !module.getInputs().contains(input)) {
module.add(input);
}
}
// Now, generate the sorted result.
ImmutableList.Builder result = ImmutableList.builder();
for (JSModule module : getAllModules()) {
result.addAll(module.getInputs());
}
return result.build();
}
/**
* Given an input and set of unprocessed inputs, return the input and it's strong dependencies by
* performing a recursive, depth-first traversal.
*/
private List getDepthFirstDependenciesOf(
CompilerInput rootInput,
Set unreachedInputs,
Map> inputsByProvide) {
List orderedInputs = new ArrayList<>();
if (!unreachedInputs.remove(rootInput)) {
return orderedInputs;
}
for (String importedNamespace : rootInput.getRequiredSymbols()) {
if (inputsByProvide.containsKey(importedNamespace)) {
for (CompilerInput input : inputsByProvide.get(importedNamespace)) {
if (unreachedInputs.contains(input)) {
orderedInputs.addAll(
getDepthFirstDependenciesOf(input, unreachedInputs, inputsByProvide));
}
}
}
}
orderedInputs.add(rootInput);
return orderedInputs;
}
private Set createEntryPointInputs(
AbstractCompiler compiler,
DependencyOptions dependencyOptions,
Iterable inputs,
SortedDependencies sorter)
throws MissingModuleException, MissingProvideException {
Set entryPointInputs = new LinkedHashSet<>();
Map modulesByName = getModulesByName();
if (dependencyOptions.shouldPrune()) {
// Some files implicitly depend on base.js without actually requiring anything.
// So we always treat it as the first entry point to ensure it's ordered correctly.
CompilerInput baseJs = sorter.maybeGetInputProviding("goog");
if (baseJs != null) {
entryPointInputs.add(baseJs);
}
if (!dependencyOptions.shouldDropMoochers()) {
for (CompilerInput entryPointInput : sorter.getInputsWithoutProvides()) {
if (entryPointInput.getSourceFile().isWeak()) {
compiler.report(
JSError.make(
IMPLICIT_WEAK_ENTRY_POINT_ERROR, entryPointInput.getSourceFile().getName()));
} else {
entryPointInputs.add(entryPointInput);
}
}
}
for (ModuleIdentifier entryPoint : dependencyOptions.getEntryPoints()) {
CompilerInput entryPointInput = null;
try {
if (entryPoint.getClosureNamespace().equals(entryPoint.getModuleName())) {
entryPointInput = sorter.maybeGetInputProviding(entryPoint.getClosureNamespace());
// Check to see if we can find the entry point as an ES6 and CommonJS module
// ES6 and CommonJS entry points may not provide any symbols
if (entryPointInput == null) {
entryPointInput = sorter.getInputProviding(entryPoint.getName());
}
} else {
JSModule module = modulesByName.get(entryPoint.getModuleName());
if (module == null) {
throw new MissingModuleException(entryPoint.getModuleName());
} else {
entryPointInput = sorter.getInputProviding(entryPoint.getClosureNamespace());
entryPointInput.overrideModule(module);
}
}
} catch (MissingProvideException e) {
throw new MissingProvideException(entryPoint.getName(), e);
}
if (entryPointInput.getSourceFile().isWeak()) {
compiler.report(
JSError.make(
EXPLICIT_WEAK_ENTRY_POINT_ERROR, entryPointInput.getSourceFile().getName()));
} else {
entryPointInputs.add(entryPointInput);
}
}
} else {
Iterables.addAll(entryPointInputs, inputs);
}
return entryPointInputs;
}
@SuppressWarnings("unused")
LinkedDirectedGraph toGraphvizGraph() {
LinkedDirectedGraph graphViz =
LinkedDirectedGraph.create();
for (JSModule module : getAllModules()) {
graphViz.createNode(module);
for (JSModule dep : module.getDependencies()) {
graphViz.createNode(dep);
graphViz.connect(module, "->", dep);
}
}
return graphViz;
}
/**
* A module depth comparator that considers a deeper module to be "less than"
* a shallower module. Uses module names to consistently break ties.
*/
private static final class InverseDepthComparator extends Ordering {
static final InverseDepthComparator INSTANCE = new InverseDepthComparator();
@Override
public int compare(JSModule m1, JSModule m2) {
return depthCompare(m2, m1);
}
}
private static int depthCompare(JSModule m1, JSModule m2) {
if (m1 == m2) {
return 0;
}
int d1 = m1.getDepth();
int d2 = m2.getDepth();
return d1 < d2 ? -1 : d2 == d1 ? m1.getName().compareTo(m2.getName()) : 1;
}
/**
* Exception class for declaring when the modules being fed into a
* JSModuleGraph as input aren't in dependence order, and so can't be
* processed for caching of various dependency-related queries.
*/
protected static class ModuleDependenceException
extends IllegalArgumentException {
private static final long serialVersionUID = 1;
private final JSModule module;
private final JSModule dependentModule;
protected ModuleDependenceException(String message,
JSModule module, JSModule dependentModule) {
super(message);
this.module = module;
this.dependentModule = dependentModule;
}
public JSModule getModule() {
return module;
}
public JSModule getDependentModule() {
return dependentModule;
}
}
/** Another exception class */
public static class MissingModuleException extends Exception {
MissingModuleException(String moduleName) {
super(moduleName);
}
}
}