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Liferay Frontend JS Minifier
/*
* 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.Strings.isNullOrEmpty;
import static java.nio.charset.StandardCharsets.UTF_8;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.io.CharStreams;
import com.google.common.io.Resources;
import com.google.javascript.rhino.StaticSourceFile;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.Serializable;
import java.io.StringReader;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.net.URLConnection;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Enumeration;
import java.util.List;
import java.util.Objects;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
/**
* An abstract representation of a source file that provides access to language-neutral features.
* The source file can be loaded from various locations, such as from disk or from a preloaded
* string.
*
* @author [email protected] (Nick Santos)
*/
public class SourceFile implements StaticSourceFile, Serializable {
private static final long serialVersionUID = 1L;
private static final String UTF8_BOM = "\uFEFF";
/** A JavaScript source code provider. The value should
* be cached so that the source text stays consistent throughout a single
* compile. */
public interface Generator {
public String getCode();
}
/**
* Number of lines in the region returned by {@link #getRegion(int)}.
* This length must be odd.
*/
private static final int SOURCE_EXCERPT_REGION_LENGTH = 5;
private final String fileName;
private boolean isExternFile = false;
// The fileName may not always identify the original file - for example,
// supersourced Java inputs, or Java inputs that come from Jar files. This
// is an optional field that the creator of an AST or SourceFile can set.
// It could be a path to the original file, or in case this SourceFile came
// from a Jar, it could be the path to the Jar.
private String originalPath = null;
// Source Line Information
private transient int[] lineOffsets = null;
private transient String code = null;
static final DiagnosticType DUPLICATE_ZIP_CONTENTS = DiagnosticType.warning(
"JSC_DUPLICATE_ZIP_CONTENTS",
"Two zip entries containing the same relative path.\n"
+ "Entry 1: {0}\n"
+ "Entry 2: {1}");
/**
* Construct a new abstract source file.
*
* @param fileName The file name of the source file. It does not necessarily need to correspond to
* a real path. But it should be unique. Will appear in warning messages emitted by the
* compiler.
*/
public SourceFile(String fileName) {
if (isNullOrEmpty(fileName)) {
throw new IllegalArgumentException("a source must have a name");
}
if (!"/".equals(File.separator)) {
this.fileName = fileName.replace(File.separator, "/");
} else {
this.fileName = fileName;
}
}
@Override
public int getLineOffset(int lineno) {
findLineOffsets();
if (lineno < 1 || lineno > lineOffsets.length) {
throw new IllegalArgumentException(
"Expected line number between 1 and " + lineOffsets.length +
"\nActual: " + lineno);
}
return lineOffsets[lineno - 1];
}
/** @return The number of lines in this source file. */
int getNumLines() {
findLineOffsets();
return lineOffsets.length;
}
private void findLineOffsets() {
if (lineOffsets != null) {
return;
}
try {
String[] sourceLines = getCode().split("\n", -1);
lineOffsets = new int[sourceLines.length];
for (int ii = 1; ii < sourceLines.length; ++ii) {
lineOffsets[ii] =
lineOffsets[ii - 1] + sourceLines[ii - 1].length() + 1;
}
} catch (IOException e) {
lineOffsets = new int[1];
lineOffsets[0] = 0;
}
}
private void resetLineOffsets() {
lineOffsets = null;
}
//////////////////////////////////////////////////////////////////////////////
// Implementation
/**
* Gets all the code in this source file.
* @throws IOException
*/
public String getCode() throws IOException {
return code;
}
/**
* Gets a reader for the code in this source file.
*/
@GwtIncompatible("java.io.Reader")
public Reader getCodeReader() throws IOException {
return new StringReader(getCode());
}
@VisibleForTesting
String getCodeNoCache() {
return code;
}
void setCode(String sourceCode) {
this.setCode(sourceCode, false);
}
void setCode(String sourceCode, boolean removeUtf8Bom) {
if (removeUtf8Bom && sourceCode != null && sourceCode.startsWith(UTF8_BOM)) {
code = sourceCode.substring(UTF8_BOM.length());
} else {
code = sourceCode;
}
resetLineOffsets();
}
public String getOriginalPath() {
return originalPath != null ? originalPath : fileName;
}
public void setOriginalPath(String originalPath) {
this.originalPath = originalPath;
}
// For SourceFile types which cache source code that can be regenerated
// easily, flush the cache. We maintain the cache mostly to speed up
// generating source when displaying error messages, so dumping the file
// contents after the compile is a fine thing to do.
public void clearCachedSource() {
// By default, do nothing. Not all kinds of SourceFiles can regenerate
// code.
}
boolean hasSourceInMemory() {
return code != null;
}
/** Returns a unique name for the source file. */
@Override
public String getName() {
return fileName;
}
/** Returns whether this is an extern. */
@Override
public boolean isExtern() {
return isExternFile;
}
/** Sets that this is an extern. */
void setIsExtern(boolean newVal) {
isExternFile = newVal;
}
@Override
public int getLineOfOffset(int offset) {
findLineOffsets();
int search = Arrays.binarySearch(lineOffsets, offset);
if (search >= 0) {
return search + 1; // lines are 1-based.
} else {
int insertionPoint = -1 * (search + 1);
return Math.min(insertionPoint - 1, lineOffsets.length - 1) + 1;
}
}
@Override
public int getColumnOfOffset(int offset) {
int line = getLineOfOffset(offset);
return offset - lineOffsets[line - 1];
}
/**
* 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) {
findLineOffsets();
if (lineNumber > lineOffsets.length) {
return null;
}
if (lineNumber < 1) {
lineNumber = 1;
}
int pos = lineOffsets[lineNumber - 1];
String js = "";
try {
// NOTE(nicksantos): Right now, this is optimized for few warnings.
// This is probably the right trade-off, but will be slow if there
// are lots of warnings in one file.
js = getCode();
} catch (IOException e) {
return null;
}
if (js.indexOf('\n', pos) == -1) {
// If next new line cannot be found, there are two cases
// 1. pos already reaches the end of file, then null should be returned
// 2. otherwise, return the contents between pos and the end of file.
if (pos >= js.length()) {
return null;
} else {
return js.substring(pos, js.length());
}
} else {
return js.substring(pos, js.indexOf('\n', pos));
}
}
/**
* 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) {
String js = "";
try {
js = getCode();
} catch (IOException e) {
return null;
}
int pos = 0;
int startLine = Math.max(1,
lineNumber - (SOURCE_EXCERPT_REGION_LENGTH + 1) / 2 + 1);
for (int n = 1; n < startLine; n++) {
int nextpos = js.indexOf('\n', pos);
if (nextpos == -1) {
break;
}
pos = nextpos + 1;
}
int end = pos;
int endLine = startLine;
for (int n = 0; n < SOURCE_EXCERPT_REGION_LENGTH; n++, endLine++) {
end = js.indexOf('\n', end);
if (end == -1) {
break;
}
end++;
}
if (lineNumber >= endLine) {
return null;
}
if (end == -1) {
int last = js.length() - 1;
if (js.charAt(last) == '\n') {
return
new SimpleRegion(startLine, endLine, js.substring(pos, last));
} else {
return new SimpleRegion(startLine, endLine, js.substring(pos));
}
} else {
return new SimpleRegion(startLine, endLine, js.substring(pos, end));
}
}
@Override
public String toString() {
return fileName;
}
@GwtIncompatible("java.util.zip.ZipFile")
public static List fromZipFile(String zipName, Charset inputCharset)
throws IOException {
final String absoluteZipPath = new File(zipName).getAbsolutePath();
List sourceFiles = new ArrayList<>();
try (ZipFile zipFile = new ZipFile(absoluteZipPath)) {
Enumeration zipEntries = zipFile.entries();
while (zipEntries.hasMoreElements()) {
ZipEntry zipEntry = zipEntries.nextElement();
String entryName = zipEntry.getName();
if (!entryName.endsWith(".js")) { // Only accept js files
continue;
}
sourceFiles.add(fromZipEntry(zipName, absoluteZipPath, entryName, inputCharset));
}
}
return sourceFiles;
}
static final String BANG_SLASH = "!/";
static final String JAR_URL_PREFIX = "jar:file:";
private static boolean isZipEntry(String path) {
return path.contains(".zip!/") && (path.endsWith(".js") || path.endsWith(".js.map"));
}
@GwtIncompatible("java.io.File")
private static SourceFile fromZipEntry(String zipURL, Charset inputCharset) {
checkArgument(isZipEntry(zipURL));
String[] components = zipURL.split(BANG_SLASH);
try {
String zipPath = components[0];
String relativePath = components[1];
return fromZipEntry(zipPath, zipPath, relativePath, inputCharset);
} catch (MalformedURLException e) {
throw new RuntimeException(e);
}
}
@GwtIncompatible("java.net.URL")
public static SourceFile fromZipEntry(
String originalZipPath, String absoluteZipPath, String entryPath, Charset inputCharset)
throws MalformedURLException {
String zipEntryPath = JAR_URL_PREFIX + absoluteZipPath + BANG_SLASH + entryPath;
URL zipEntryUrl = new URL(zipEntryPath);
return builder()
.withCharset(inputCharset)
.withOriginalPath(originalZipPath + BANG_SLASH + entryPath)
.buildFromUrl(zipEntryUrl);
}
@GwtIncompatible("java.io.File")
public static SourceFile fromFile(String fileName, Charset charset) {
return builder().withCharset(charset).buildFromFile(fileName);
}
@GwtIncompatible("java.io.File")
public static SourceFile fromFile(String fileName) {
return fromFile(fileName, UTF_8);
}
/** @deprecated Use {@link SourceFile#fromPath(Path, Charset)} */
@Deprecated
@GwtIncompatible("java.io.File")
public static SourceFile fromFile(File file, Charset c) {
return builder().withCharset(c).buildFromFile(file);
}
/** @deprecated Use {@link #fromPath(Path, Charset)} */
@Deprecated
@GwtIncompatible("java.io.File")
public static SourceFile fromFile(File file) {
return fromFile(file, UTF_8);
}
@GwtIncompatible("java.io.File")
public static SourceFile fromPath(Path path, Charset c) {
return builder().withCharset(c).buildFromPath(path);
}
public static SourceFile fromCode(String fileName, String code) {
return builder().buildFromCode(fileName, code);
}
/**
* @deprecated Use {@link #fromInputStream(String, InputStream, Charset)}
*/
@Deprecated
@GwtIncompatible("java.io.InputStream")
public static SourceFile fromInputStream(String fileName, InputStream s)
throws IOException {
return builder().buildFromInputStream(fileName, s);
}
@GwtIncompatible("java.io.InputStream")
public static SourceFile fromInputStream(String fileName, InputStream s,
Charset charset) throws IOException {
return builder().withCharset(charset).buildFromInputStream(fileName, s);
}
@GwtIncompatible("java.io.Reader")
public static SourceFile fromReader(String fileName, Reader r)
throws IOException {
return builder().buildFromReader(fileName, r);
}
public static SourceFile fromGenerator(String fileName,
Generator generator) {
return builder().buildFromGenerator(fileName, generator);
}
/** Create a new builder for source files. */
public static Builder builder() {
return new Builder();
}
/**
* A builder interface for source files.
*
* Allows users to customize the Charset, and the original path of
* the source file (if it differs from the path on disk).
*/
public static class Builder {
private Charset charset = UTF_8;
private String originalPath = null;
public Builder() {}
/** Set the charset to use when reading from an input stream or file. */
public Builder withCharset(Charset charset) {
this.charset = charset;
return this;
}
public Builder withOriginalPath(String originalPath) {
this.originalPath = originalPath;
return this;
}
@GwtIncompatible("java.io.File")
public SourceFile buildFromFile(String fileName) {
return buildFromFile(new File(fileName));
}
/**
* @deprecated Use {@link #buildFromPath(Path path)}
*/
@GwtIncompatible("java.io.File")
@Deprecated
public SourceFile buildFromFile(File file) {
return buildFromPath(file.toPath());
}
@GwtIncompatible("java.io.File")
public SourceFile buildFromPath(Path path) {
if (isZipEntry(path.toString())) {
return fromZipEntry(path.toString(), charset);
}
return new OnDisk(path, originalPath, charset);
}
@GwtIncompatible("java.net.URL")
public SourceFile buildFromUrl(URL url) {
return new AtUrl(url, originalPath, charset);
}
public SourceFile buildFromCode(String fileName, String code) {
return new Preloaded(fileName, originalPath, code);
}
@GwtIncompatible("java.io.InputStream")
public SourceFile buildFromInputStream(String fileName, InputStream s) throws IOException {
return buildFromCode(fileName, CharStreams.toString(new InputStreamReader(s, charset)));
}
@GwtIncompatible("java.io.Reader")
public SourceFile buildFromReader(String fileName, Reader r) throws IOException {
return buildFromCode(fileName, CharStreams.toString(r));
}
public SourceFile buildFromGenerator(String fileName, Generator generator) {
return new Generated(fileName, originalPath, generator);
}
}
//////////////////////////////////////////////////////////////////////////////
// Implementations
/**
* A source file where the code has been preloaded.
*/
static class Preloaded extends SourceFile {
private static final long serialVersionUID = 1L;
Preloaded(String fileName, String originalPath, String code) {
super(fileName);
super.setOriginalPath(originalPath);
super.setCode(code);
}
}
/**
* A source file where the code will be dynamically generated
* from the injected interface.
*/
static class Generated extends SourceFile {
// Avoid serializing generator and remove the burden to make classes that implement
// Generator serializable. There should be no need to obtain generated source in the
// second stage of compilation. Making the generator transient relies on not clearing the
// code cache for these classes up serialization which might be quite wasteful.
private transient Generator generator;
// Not private, so that LazyInput can extend it.
Generated(String fileName, String originalPath, Generator generator) {
super(fileName);
super.setOriginalPath(originalPath);
this.generator = generator;
}
@Override
public synchronized String getCode() throws IOException {
String cachedCode = super.getCode();
if (cachedCode == null) {
cachedCode = generator.getCode();
super.setCode(cachedCode);
}
return cachedCode;
}
// Clear out the generated code when finished with a compile; we can
// regenerate it if we ever need it again.
@Override
public void clearCachedSource() {
super.setCode(null);
}
@Override
public void restoreFrom(SourceFile sourceFile) {
super.restoreFrom(sourceFile);
this.generator = ((Generated) sourceFile).generator;
}
}
/**
* A source file where the code is only read into memory if absolutely necessary. We will try to
* delay loading the code into memory as long as possible.
*/
@GwtIncompatible("java.io.File")
static class OnDisk extends SourceFile {
private static final long serialVersionUID = 1L;
private transient Path path;
private transient Charset inputCharset = UTF_8;
OnDisk(Path path, String originalPath, Charset c) {
super(path.toString());
this.path = path;
setOriginalPath(originalPath);
if (c != null) {
this.setCharset(c);
}
}
@Override
public synchronized String getCode() throws IOException {
String cachedCode = super.getCode();
if (cachedCode == null) {
try (Reader r = getCodeReader()) {
cachedCode = CharStreams.toString(r);
} catch (java.nio.charset.MalformedInputException e) {
throw new IOException("Failed to read: " + path + ", is this input UTF-8 encoded?", e);
}
super.setCode(cachedCode, Objects.equals(this.getCharset(), inputCharset));
// Byte Order Mark can be removed by setCode
cachedCode = super.getCode();
}
return cachedCode;
}
/**
* Gets a reader for the code in this source file.
*/
@Override
public Reader getCodeReader() throws IOException {
if (hasSourceInMemory()) {
return super.getCodeReader();
} else {
// If we haven't pulled the code into memory yet, don't.
return Files.newBufferedReader(path, inputCharset);
}
}
// Flush the cached code after the compile; we can read it off disk
// if we need it again.
@Override
public void clearCachedSource() {
super.setCode(null);
}
/**
* Store the Charset specification as the string version of the name,
* rather than the Charset itself. This allows us to serialize the
* SourceFile class.
* @param c charset to use when reading the input.
*/
public void setCharset(Charset c) {
inputCharset = c;
}
/**
* Get the Charset specifying how we're supposed to read the file
* in off disk and into UTF-16. This is stored as a strong to allow
* SourceFile to be serialized.
* @return Charset object representing charset to use.
*/
public Charset getCharset() {
return inputCharset;
}
@GwtIncompatible("ObjectOutputStream")
private void writeObject(java.io.ObjectOutputStream out) throws Exception {
// Clear the cached source.
out.defaultWriteObject();
out.writeObject(inputCharset != null ? inputCharset.name() : null);
out.writeObject(path != null ? path.toUri() : null);
}
@GwtIncompatible("ObjectInputStream")
private void readObject(java.io.ObjectInputStream in) throws Exception {
in.defaultReadObject();
String inputCharsetName = (String) in.readObject();
inputCharset = inputCharsetName != null ? Charset.forName(inputCharsetName) : null;
URI uri = (URI) in.readObject();
path = uri != null ? Paths.get(uri) : null;
// Code will be reread or restored.
super.setCode(null);
}
}
/**
* A source file at a URL where the code is only read into memory if absolutely
* necessary. We will try to delay loading the code into memory as long as
* possible.
*
* In practice this is used to load code in entries inside of zip files.
*/
@GwtIncompatible("java.net.URL")
static class AtUrl extends SourceFile {
private static final long serialVersionUID = 1L;
private final URL url;
// This is stored as a String, but passed in and out as a Charset so that
// we can serialize the class.
// Default input file format for the compiler has always been UTF_8.
private String inputCharset = UTF_8.name();
AtUrl(URL url, String originalPath, Charset c) {
super(originalPath);
this.url = url;
super.setOriginalPath(originalPath);
if (c != null) {
this.setCharset(c);
}
}
@Override
public synchronized String getCode() throws IOException {
String cachedCode = super.getCode();
if (cachedCode == null) {
URLConnection urlConnection = url.openConnection();
// Perform the read through the URL connection while making sure that it does not internally
// cache, because its default internal caching would defeat our own cache management.
urlConnection.setUseCaches(false);
InputStream inputStream = urlConnection.getInputStream();
cachedCode = CharStreams.toString(new InputStreamReader(inputStream, this.getCharset()));
// Must close the stream or else the cache won't be cleared.
inputStream.close();
super.setCode(cachedCode, Objects.equals(this.getCharset(), StandardCharsets.UTF_8));
// Byte Order Mark can be removed by setCode
cachedCode = super.getCode();
}
return cachedCode;
}
/**
* Gets a reader for the code at this URL.
*/
@Override
public Reader getCodeReader() throws IOException {
if (hasSourceInMemory()) {
return super.getCodeReader();
} else {
// If we haven't pulled the code into memory yet, don't.
return Resources.asCharSource(url, StandardCharsets.UTF_8).openStream();
}
}
// Flush the cached code after the compile; we can read it from the URL
// if we need it again.
@Override
public void clearCachedSource() {
super.setCode(null);
}
/**
* Store the Charset specification as the string version of the name,
* rather than the Charset itself. This allows us to serialize the
* SourceFile class.
* @param c charset to use when reading the input.
*/
public void setCharset(Charset c) {
inputCharset = c.name();
}
/**
* Get the Charset specifying how we're supposed to read the URL
* into UTF-16. This is stored as a string to allow SourceFile to be
* serialized.
* @return Charset object representing charset to use.
*/
public Charset getCharset() {
return Charset.forName(inputCharset);
}
@GwtIncompatible("ObjectInputStream")
private void readObject(java.io.ObjectInputStream in) throws Exception {
in.defaultReadObject();
// Code will be reread or restored.
super.setCode(null);
}
}
public void restoreFrom(SourceFile sourceFile) {
this.code = sourceFile.code;
}
@GwtIncompatible("ObjectInputStream")
private void readObject(java.io.ObjectInputStream in) throws Exception {
in.defaultReadObject();
code = "";
}
}