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/*
* 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.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableCollection;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.javascript.jscomp.deps.DependencyInfo;
import com.google.javascript.jscomp.deps.JsFileRegexParser;
import com.google.javascript.jscomp.deps.ModuleLoader;
import com.google.javascript.jscomp.deps.ModuleLoader.ModulePath;
import com.google.javascript.jscomp.deps.SimpleDependencyInfo;
import com.google.javascript.jscomp.parsing.parser.FeatureSet;
import com.google.javascript.rhino.InputId;
import com.google.javascript.rhino.JSDocInfo;
import com.google.javascript.rhino.Node;
import com.google.javascript.rhino.StaticSourceFile.SourceKind;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
/**
* A class for the internal representation of an input to the compiler. Wraps a {@link SourceAst}
* and maintain state such as module for the input and whether the input is an extern. Also
* calculates provided and required types.
*/
public class CompilerInput extends DependencyInfo.Base implements SourceAst {
private static final long serialVersionUID = 1L;
// Info about where the file lives.
private JSModule module;
private final InputId id;
// The AST.
private final SourceAst ast;
// DependencyInfo to delegate to.
private DependencyInfo dependencyInfo;
private final List extraRequires = new ArrayList<>();
private final List extraProvides = new ArrayList<>();
private final List orderedRequires = new ArrayList<>();
private final List dynamicRequires = new ArrayList<>();
private boolean hasFullParseDependencyInfo = false;
private ModuleType jsModuleType = ModuleType.NONE;
// An AbstractCompiler for doing parsing.
// We do not want to persist this across serialized state.
private transient AbstractCompiler compiler;
private transient ModulePath modulePath;
// TODO(tjgq): Whether a CompilerInput is an externs file is determined by the `isExtern`
// constructor argument and the `setIsExtern` method. Both are necessary because, while externs
// files passed under the --externs flag are not required to contain an @externs annotation,
// externs files passed under any other flag must have one, and the presence of the latter can
// only be known once the file has been parsed. To add to the confusion, note that CompilerInput
// doesn't actually store the extern bit itself, but instead mutates the SourceFile associated
// with the AST node. Once (when?) we enforce that extern files always contain an @externs
// annotation, we can store the extern bit in the AST node, and make SourceFile immutable.
public CompilerInput(SourceAst ast) {
this(ast, ast.getSourceFile().getName(), false);
}
public CompilerInput(SourceAst ast, boolean isExtern) {
this(ast, ast.getInputId(), isExtern);
}
public CompilerInput(SourceAst ast, String inputId, boolean isExtern) {
this(ast, new InputId(inputId), isExtern);
}
public CompilerInput(SourceAst ast, InputId inputId, boolean isExtern) {
this.ast = ast;
this.id = inputId;
if (isExtern) {
setIsExtern();
}
}
public CompilerInput(SourceFile file) {
this(file, false);
}
public CompilerInput(SourceFile file, boolean isExtern) {
this(new JsAst(file), isExtern);
}
/** Returns a name for this input. Must be unique across all inputs. */
@Override
public InputId getInputId() {
return id;
}
/** Returns a name for this input. Must be unique across all inputs. */
@Override
public String getName() {
return id.getIdName();
}
/** Gets the path relative to closure-base, if one is available. */
@Override
public String getPathRelativeToClosureBase() {
// TODO(nicksantos): Implement me.
throw new UnsupportedOperationException();
}
@Override
public Node getAstRoot(AbstractCompiler compiler) {
Node root = checkNotNull(ast.getAstRoot(compiler));
checkState(root.isScript());
checkNotNull(root.getInputId());
return root;
}
@Override
public void clearAst() {
ast.clearAst();
}
@Override
public SourceFile getSourceFile() {
return ast.getSourceFile();
}
@Override
public void setSourceFile(SourceFile file) {
ast.setSourceFile(file);
}
/** Sets an abstract compiler for doing parsing. */
public void setCompiler(AbstractCompiler compiler) {
this.compiler = compiler;
}
/** Gets a list of types depended on by this input. */
@Override
public ImmutableList getRequires() {
if (hasFullParseDependencyInfo) {
return ImmutableList.copyOf(orderedRequires);
}
return getDependencyInfo().getRequires();
}
@Override
public ImmutableList getTypeRequires() {
return getDependencyInfo().getTypeRequires();
}
/**
* Gets a list of namespaces and paths depended on by this input, but does not attempt to
* regenerate the dependency information. Typically this occurs from module rewriting.
*/
ImmutableCollection getKnownRequires() {
return concat(
dependencyInfo != null ? dependencyInfo.getRequires() : ImmutableList.of(), extraRequires);
}
ImmutableList getKnownRequiredSymbols() {
return Require.asSymbolList(getKnownRequires());
}
/** Gets a list of types provided by this input. */
@Override
public ImmutableList getProvides() {
return getDependencyInfo().getProvides();
}
@Override
public boolean getHasExternsAnnotation() {
return getDependencyInfo().getHasExternsAnnotation();
}
@Override
public boolean getHasNoCompileAnnotation() {
return getDependencyInfo().getHasNoCompileAnnotation();
}
/**
* Gets a list of types provided, but does not attempt to
* regenerate the dependency information. Typically this occurs
* from module rewriting.
*/
ImmutableCollection getKnownProvides() {
return concat(
dependencyInfo != null ? dependencyInfo.getProvides() : ImmutableList.of(),
extraProvides);
}
/**
* Registers a type that this input defines. Includes both explicitly declared namespaces via
* goog.provide and goog.module calls as well as implicit namespaces provided by module rewriting.
*/
public void addProvide(String provide) {
extraProvides.add(provide);
}
/** Registers a type that this input depends on in the order seen in the file. */
public boolean addOrderedRequire(Require require) {
if (!orderedRequires.contains(require)) {
orderedRequires.add(require);
return true;
}
return false;
}
/**
* Returns the types that this input dynamically depends on in the order seen in the file. The
* returned types were loaded dynamically so while they are part of the dependency graph, they do
* not need sorted before this input.
*/
public ImmutableList getDynamicRequires() {
return ImmutableList.copyOf(dynamicRequires);
}
/**
* Registers a type that this input depends on in the order seen in the file. The type was loaded
* dynamically so while it is part of the dependency graph, it does not need sorted before this
* input.
*/
public boolean addDynamicRequire(String require) {
if (!dynamicRequires.contains(require)) {
dynamicRequires.add(require);
return true;
}
return false;
}
public void setHasFullParseDependencyInfo(boolean hasFullParseDependencyInfo) {
this.hasFullParseDependencyInfo = hasFullParseDependencyInfo;
}
public ModuleType getJsModuleType() {
return jsModuleType;
}
public void setJsModuleType(ModuleType moduleType) {
jsModuleType = moduleType;
}
/** Registers a type that this input depends on. */
public void addRequire(Require require) {
extraRequires.add(require);
}
/** Returns the DependencyInfo object, generating it lazily if necessary. */
DependencyInfo getDependencyInfo() {
if (dependencyInfo == null) {
dependencyInfo = generateDependencyInfo();
}
if (!extraRequires.isEmpty() || !extraProvides.isEmpty()) {
dependencyInfo =
SimpleDependencyInfo.builder(getName(), getName())
.setProvides(concat(dependencyInfo.getProvides(), extraProvides))
.setRequires(concat(dependencyInfo.getRequires(), extraRequires))
.setTypeRequires(dependencyInfo.getTypeRequires())
.setLoadFlags(dependencyInfo.getLoadFlags())
.setHasExternsAnnotation(dependencyInfo.getHasExternsAnnotation())
.setHasNoCompileAnnotation(dependencyInfo.getHasNoCompileAnnotation())
.build();
extraRequires.clear();
extraProvides.clear();
}
return dependencyInfo;
}
/**
* Generates the DependencyInfo by scanning and/or parsing the file.
* This is called lazily by getDependencyInfo, and does not take into
* account any extra requires/provides added by {@link #addRequire}
* or {@link #addProvide}.
*/
private DependencyInfo generateDependencyInfo() {
Preconditions.checkNotNull(compiler, "Expected setCompiler to be called first: %s", this);
Preconditions.checkNotNull(
compiler.getErrorManager(), "Expected compiler to call an error manager: %s", this);
// If the code is a JsAst, then it was originally JS code, and is compatible with the
// regex-based parsing of JsFileRegexParser.
if (ast instanceof JsAst && JsFileRegexParser.isSupported()) {
// Look at the source code.
// Note: it's OK to use getName() instead of
// getPathRelativeToClosureBase() here because we're not using
// this to generate deps files. (We're only using it for
// symbol dependencies.)
try {
DependencyInfo info =
new JsFileRegexParser(compiler.getErrorManager())
.setModuleLoader(compiler.getModuleLoader())
.setIncludeGoogBase(true)
.parseFile(getName(), getName(), getCode());
return new LazyParsedDependencyInfo(info, (JsAst) ast, compiler);
} catch (IOException e) {
compiler.getErrorManager().report(CheckLevel.ERROR,
JSError.make(AbstractCompiler.READ_ERROR, getName(), e.getMessage()));
return SimpleDependencyInfo.EMPTY;
}
} else {
// Otherwise, just look at the AST.
DepsFinder finder = new DepsFinder(getPath());
Node root = getAstRoot(compiler);
if (root == null) {
return SimpleDependencyInfo.EMPTY;
}
finder.visitTree(root);
JSDocInfo info = root.getJSDocInfo();
// TODO(nicksantos|user): This caching behavior is a bit
// odd, and only works if you assume the exact call flow that
// clients are currently using. In that flow, they call
// getProvides(), then remove the goog.provide calls from the
// AST, and then call getProvides() again.
//
// This won't work for any other call flow, or any sort of incremental
// compilation scheme. The API needs to be fixed so callers aren't
// doing weird things like this, and then we should get rid of the
// multiple-scan strategy.
return SimpleDependencyInfo.builder("", "")
.setProvides(finder.provides)
.setRequires(finder.requires)
.setTypeRequires(finder.typeRequires)
.setLoadFlags(finder.loadFlags)
.setHasExternsAnnotation(info != null && info.isExterns())
.setHasNoCompileAnnotation(info != null && info.isNoCompile())
.build();
}
}
private static class DepsFinder {
private final Map loadFlags = new TreeMap<>();
private final List provides = new ArrayList<>();
private final List requires = new ArrayList<>();
private final List typeRequires = new ArrayList<>();
private final ModulePath modulePath;
DepsFinder(ModulePath modulePath) {
this.modulePath = modulePath;
}
void visitTree(Node n) {
visitSubtree(n, null);
checkArgument(n.isScript());
FeatureSet features = (FeatureSet) n.getProp(Node.FEATURE_SET);
if (features != null) {
// Only add the "lang" load flag if it's not the default (es3), so that
// legacy deps files will remain unchanged (i.e. load flags omitted).
String version = features.version();
if (!version.equals("es3")) {
loadFlags.put("lang", version);
}
}
}
void visitSubtree(Node n, Node parent) {
switch (n.getToken()) {
case CALL:
if (n.hasTwoChildren()
&& n.getFirstChild().isGetProp()
&& n.getFirstFirstChild().matchesName("goog")) {
if (!requires.contains(Require.BASE)) {
requires.add(Require.BASE);
}
Node callee = n.getFirstChild();
Node argument = n.getLastChild();
switch (callee.getLastChild().getString()) {
case "module":
loadFlags.put("module", "goog");
// Fall-through
case "provide":
if (!argument.isString()) {
return;
}
provides.add(argument.getString());
return;
case "require":
if (!argument.isString()) {
return;
}
requires.add(Require.googRequireSymbol(argument.getString()));
return;
case "requireType":
if (!argument.isString()) {
return;
}
typeRequires.add(argument.getString());
return;
case "loadModule":
// Process the block of the loadModule argument
n = argument.getLastChild();
break;
default:
return;
}
} else if (parent.isGetProp()
// TODO(johnplaisted): Consolidate on declareModuleId
&& parent.matchesQualifiedName("goog.declareModuleId")
&& parent.getParent().isCall()) {
Node argument = parent.getParent().getSecondChild();
if (!argument.isString()) {
return;
}
provides.add(argument.getString());
}
break;
case MODULE_BODY:
if (!parent.getBooleanProp(Node.GOOG_MODULE)) {
provides.add(modulePath.toModuleName());
loadFlags.put("module", "es6");
}
break;
case IMPORT:
visitEs6ModuleName(n.getLastChild(), n);
return;
case EXPORT:
if (NodeUtil.isExportFrom(n)) {
visitEs6ModuleName(n.getLastChild(), n);
}
return;
case VAR:
if (n.getFirstChild().matchesName("goog")
&& NodeUtil.isNamespaceDecl(n.getFirstChild())) {
provides.add("goog");
}
break;
case EXPR_RESULT:
case CONST:
case BLOCK:
case SCRIPT:
case NAME:
case DESTRUCTURING_LHS:
case LET:
break;
default:
return;
}
for (Node child = n.getFirstChild();
child != null; child = child.getNext()) {
visitSubtree(child, n);
}
}
void visitEs6ModuleName(Node n, Node parent) {
checkArgument(n.isString());
checkArgument(parent.isExport() || parent.isImport());
// TODO(blickly): Move this (and the duplicated logic in JsFileRegexParser/Es6RewriteModules)
// into ModuleLoader.
String moduleName = n.getString();
if (moduleName.startsWith("goog:")) {
// cut off the "goog:" prefix
requires.add(Require.googRequireSymbol(moduleName.substring(5)));
return;
}
ModulePath importedModule =
modulePath.resolveJsModule(
moduleName, modulePath.toString(), n.getLineno(), n.getCharno());
if (importedModule == null) {
importedModule = modulePath.resolveModuleAsPath(moduleName);
}
requires.add(Require.es6Import(importedModule.toModuleName(), n.getString()));
}
}
public String getCode() throws IOException {
return getSourceFile().getCode();
}
/** Returns the module to which the input belongs. */
public JSModule getModule() {
return module;
}
/** Sets the module to which the input belongs. */
public void setModule(JSModule module) {
// An input may only belong to one module.
checkArgument(module == null || this.module == null || this.module == module);
this.module = module;
}
/** Overrides the module to which the input belongs. */
void overrideModule(JSModule module) {
this.module = module;
}
public boolean isExtern() {
if (ast == null || ast.getSourceFile() == null) {
return false;
}
return ast.getSourceFile().isExtern();
}
void setIsExtern() {
// TODO(tjgq): Add a precondition check here. People are passing in null, but they shouldn't be.
if (ast == null || ast.getSourceFile() == null) {
return;
}
ast.getSourceFile().setKind(SourceKind.EXTERN);
}
public int getLineOffset(int lineno) {
return ast.getSourceFile().getLineOffset(lineno);
}
/** @return The number of lines in this input. */
public int getNumLines() {
return ast.getSourceFile().getNumLines();
}
@Override
public String toString() {
return getName();
}
@Override
public ImmutableMap getLoadFlags() {
return getDependencyInfo().getLoadFlags();
}
private static ImmutableSet concat(Iterable first, Iterable second) {
return ImmutableSet.builder().addAll(first).addAll(second).build();
}
public ModulePath getPath() {
if (modulePath == null) {
ModuleLoader moduleLoader = compiler.getModuleLoader();
this.modulePath = moduleLoader.resolve(getName());
}
return modulePath;
}
/** JavaScript module type. */
public enum ModuleType {
NONE,
GOOG,
ES6,
COMMONJS,
JSON,
IMPORTED_SCRIPT
}
}
