/*
* 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 com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import com.google.common.collect.Sets;
import com.google.javascript.jscomp.deps.DependencyInfo;
import com.google.javascript.jscomp.deps.JsFileParser;
import com.google.javascript.rhino.InputId;
import com.google.javascript.rhino.Node;
import com.google.javascript.rhino.Token;
import java.io.IOException;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Set;
/**
* 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
implements SourceAst, DependencyInfo {
private static final long serialVersionUID = 1L;
// Info about where the file lives.
private JSModule module;
final private InputId id;
// The AST.
private final SourceAst ast;
// Provided and required symbols.
private final Set<String> provides = Sets.newHashSet();
private final Set<String> requires = Sets.newHashSet();
private boolean generatedDependencyInfoFromSource = false;
// An error manager for handling problems when dealing with
// provides/requires.
private ErrorManager errorManager;
// An AbstractCompiler for doing parsing.
private AbstractCompiler compiler;
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;
// TODO(nicksantos): Add a precondition check here. People are passing
// in null, but they should not be.
if (ast != null && ast.getSourceFile() != null) {
ast.getSourceFile().setIsExtern(isExtern);
}
}
public CompilerInput(JSSourceFile file) {
this(file, false);
}
public CompilerInput(JSSourceFile 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();
}
public SourceAst getAst() {
return ast;
}
/** 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 = ast.getAstRoot(compiler);
// The root maybe null if the AST can not be created.
if (root != null) {
Preconditions.checkState(root.getType() == Token.SCRIPT);
Preconditions.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);
}
/** Returns the SourceAst object on which this input is based. */
public SourceAst getSourceAst() {
return ast;
}
/** Sets an error manager for routing error messages. */
public void setErrorManager(ErrorManager errorManager) {
this.errorManager = errorManager;
}
/** Sets an abstract compiler for doing parsing. */
public void setCompiler(AbstractCompiler compiler) {
this.compiler = compiler;
setErrorManager(compiler.getErrorManager());
}
/** Gets a list of types depended on by this input. */
@Override
public Collection<String> getRequires() {
Preconditions.checkNotNull(errorManager,
"Expected setErrorManager to be called first");
try {
regenerateDependencyInfoIfNecessary();
return Collections.<String>unmodifiableSet(requires);
} catch (IOException e) {
errorManager.report(CheckLevel.ERROR,
JSError.make(AbstractCompiler.READ_ERROR, getName()));
return ImmutableList.<String>of();
}
}
/** Gets a list of types provided by this input. */
@Override
public Collection<String> getProvides() {
Preconditions.checkNotNull(errorManager,
"Expected setErrorManager to be called first");
try {
regenerateDependencyInfoIfNecessary();
return Collections.<String>unmodifiableSet(provides);
} catch (IOException e) {
errorManager.report(CheckLevel.ERROR,
JSError.make(AbstractCompiler.READ_ERROR, getName()));
return ImmutableList.<String>of();
}
}
/**
* Regenerates the provides/requires if we need to do so.
*/
private void regenerateDependencyInfoIfNecessary() throws IOException {
// If the code is NOT a JsAst, then it was not originally JS code.
// Look at the Ast for dependency info.
if (!(ast instanceof JsAst)) {
Preconditions.checkNotNull(compiler,
"Expected setCompiler to be called first");
DepsFinder finder = new DepsFinder();
Node root = getAstRoot(compiler);
if (root == null) {
return;
}
finder.visitTree(getAstRoot(compiler));
// 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.
provides.addAll(finder.provides);
requires.addAll(finder.requires);
} else {
// Otherwise, look at the source code.
if (!generatedDependencyInfoFromSource) {
// 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.)
DependencyInfo info = (new JsFileParser(errorManager)).parseFile(
getName(), getName(), getCode());
provides.addAll(info.getProvides());
requires.addAll(info.getRequires());
generatedDependencyInfoFromSource = true;
}
}
}
private static class DepsFinder {
private final List<String> provides = Lists.newArrayList();
private final List<String> requires = Lists.newArrayList();
private final CodingConvention codingConvention =
new ClosureCodingConvention();
void visitTree(Node n) {
visitSubtree(n, null);
}
void visitSubtree(Node n, Node parent) {
if (n.getType() == Token.CALL) {
String require =
codingConvention.extractClassNameIfRequire(n, parent);
if (require != null) {
requires.add(require);
}
String provide =
codingConvention.extractClassNameIfProvide(n, parent);
if (provide != null) {
provides.add(provide);
}
return;
} else if (parent != null &&
parent.getType() != Token.EXPR_RESULT &&
parent.getType() != Token.SCRIPT) {
return;
}
for (Node child = n.getFirstChild();
child != null; child = child.getNext()) {
visitSubtree(child, n);
}
}
}
/**
* Gets the source line for the indicated line number.
*
* @param lineNumber the line number, 1 being the first line of the file.
* @return The line indicated. Does not include the newline at the end
* of the file. Returns {@code null} if it does not exist,
* or if there was an IO exception.
*/
public String getLine(int lineNumber) {
return getSourceFile().getLine(lineNumber);
}
/**
* Get a region around the indicated line number. The exact definition of a
* region is implementation specific, but it must contain the line indicated
* by the line number. A region must not start or end by a carriage return.
*
* @param lineNumber the line number, 1 being the first line of the file.
* @return The line indicated. Returns {@code null} if it does not exist,
* or if there was an IO exception.
*/
public Region getRegion(int lineNumber) {
return getSourceFile().getRegion(lineNumber);
}
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.
Preconditions.checkArgument(
module == null || this.module == null || this.module == module);
this.module = module;
}
public boolean isExtern() {
if (ast == null || ast.getSourceFile() == null) {
return false;
}
return ast.getSourceFile().isExtern();
}
void setIsExtern(boolean isExtern) {
if (ast == null || ast.getSourceFile() == null) {
return;
}
ast.getSourceFile().setIsExtern(isExtern);
}
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();
}
}