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org.jetbrains.kotlin.js.sourceMap.SourceMap3Builder Maven / Gradle / Ivy
/*
* Copyright 2010-2015 JetBrains s.r.o.
*
* 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 org.jetbrains.kotlin.js.sourceMap;
import com.intellij.openapi.util.text.StringUtil;
import gnu.trove.TObjectIntHashMap;
import kotlin.io.TextStreamsKt;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.kotlin.js.parser.sourcemaps.*;
import org.jetbrains.kotlin.js.util.TextOutput;
import java.io.File;
import java.io.Reader;
import java.util.ArrayList;
import java.util.List;
import java.util.function.Supplier;
public class SourceMap3Builder implements SourceMapBuilder {
private final StringBuilder out = new StringBuilder(8192);
private final File generatedFile;
private final TextOutput textOutput;
private final String pathPrefix;
private final TObjectIntHashMap sources = new TObjectIntHashMap() {
@Override
public int get(SourceKey key) {
int index = index(key);
return index < 0 ? -1 : _values[index];
}
};
private final List orderedSources = new ArrayList<>();
private final List> orderedSourceContentSuppliers = new ArrayList<>();
private int previousGeneratedColumn = -1;
private int previousSourceIndex;
private int previousSourceLine;
private int previousSourceColumn;
private int previousMappingOffset;
private int previousPreviousSourceIndex;
private int previousPreviousSourceLine;
private int previousPreviousSourceColumn;
private boolean currentMappingIsEmpty = true;
public SourceMap3Builder(File generatedFile, TextOutput textOutput, String pathPrefix) {
this.generatedFile = generatedFile;
this.textOutput = textOutput;
this.pathPrefix = pathPrefix;
}
@Override
public File getOutFile() {
return new File(generatedFile.getParentFile(), generatedFile.getName() + ".map");
}
@Override
public String build() {
@SuppressWarnings("unchecked")
JsonObject json = new JsonObject();
json.getProperties().put("version", new JsonNumber(3));
json.getProperties().put("file", new JsonString(generatedFile.getName()));
appendSources(json);
appendSourcesContent(json);
json.getProperties().put("names", new JsonArray());
json.getProperties().put("mappings", new JsonString(out.toString()));
return json.toString();
}
private void appendSources(JsonObject json) {
JsonArray array = new JsonArray();
for (String source : orderedSources) {
array.getElements().add(new JsonString(pathPrefix + source));
}
json.getProperties().put("sources", array);
}
private void appendSourcesContent(JsonObject json) {
JsonArray array = new JsonArray();
for (Supplier contentSupplier : orderedSourceContentSuppliers) {
Reader reader = contentSupplier.get();
array.getElements().add(reader != null ? new JsonString(TextStreamsKt.readText(reader)) : JsonNull.INSTANCE);
}
json.getProperties().put("sourcesContent", array);
}
@Override
public void newLine() {
out.append(';');
previousGeneratedColumn = -1;
}
@Override
public void skipLinesAtBeginning(int count) {
out.insert(0, StringUtil.repeatSymbol(';', count));
}
private int getSourceIndex(String source, Object identityObject, Supplier contentSupplier) {
SourceKey key = new SourceKey(source, identityObject);
int sourceIndex = sources.get(key);
if (sourceIndex == -1) {
sourceIndex = orderedSources.size();
sources.put(key, sourceIndex);
orderedSources.add(source);
orderedSourceContentSuppliers.add(contentSupplier);
}
return sourceIndex;
}
@Override
public void addMapping(
@NotNull String source, @Nullable Object identityObject, @NotNull Supplier sourceContent,
int sourceLine, int sourceColumn
) {
source = source.replace(File.separatorChar, '/');
int sourceIndex = getSourceIndex(source, identityObject, sourceContent);
if (!currentMappingIsEmpty && previousSourceIndex == sourceIndex && previousSourceLine == sourceLine &&
previousSourceColumn == sourceColumn) {
return;
}
startMapping();
Base64VLQ.encode(out, sourceIndex - previousSourceIndex);
previousSourceIndex = sourceIndex;
Base64VLQ.encode(out, sourceLine - previousSourceLine);
previousSourceLine = sourceLine;
Base64VLQ.encode(out, sourceColumn - previousSourceColumn);
previousSourceColumn = sourceColumn;
currentMappingIsEmpty = false;
}
@Override
public void addEmptyMapping() {
if (!currentMappingIsEmpty) {
startMapping();
currentMappingIsEmpty = true;
}
}
private void startMapping() {
boolean newGroupStarted = previousGeneratedColumn == -1;
if (newGroupStarted) {
previousGeneratedColumn = 0;
}
int columnDiff = textOutput.getColumn() - previousGeneratedColumn;
if (!newGroupStarted) {
out.append(',');
}
if (columnDiff > 0 || newGroupStarted) {
Base64VLQ.encode(out, columnDiff);
previousGeneratedColumn = textOutput.getColumn();
previousMappingOffset = out.length();
previousPreviousSourceIndex = previousSourceIndex;
previousPreviousSourceLine = previousSourceLine;
previousPreviousSourceColumn = previousSourceColumn;
}
else {
out.setLength(previousMappingOffset);
previousSourceIndex = previousPreviousSourceIndex;
previousSourceLine = previousPreviousSourceLine;
previousSourceColumn = previousPreviousSourceColumn;
}
}
@Override
public void addLink() {
textOutput.print("\n//# sourceMappingURL=");
textOutput.print(generatedFile.getName());
textOutput.print(".map\n");
}
private static final class Base64VLQ {
// A Base64 VLQ digit can represent 5 bits, so it is base-32.
private static final int VLQ_BASE_SHIFT = 5;
private static final int VLQ_BASE = 1 << VLQ_BASE_SHIFT;
// A mask of bits for a VLQ digit (11111), 31 decimal.
private static final int VLQ_BASE_MASK = VLQ_BASE - 1;
// The continuation bit is the 6th bit.
private static final int VLQ_CONTINUATION_BIT = VLQ_BASE;
@SuppressWarnings("SpellCheckingInspection")
private static final char[] BASE64_MAP = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray();
private Base64VLQ() {
}
private static int toVLQSigned(int value) {
return value < 0 ? ((-value) << 1) + 1 : value << 1;
}
public static void encode(StringBuilder out, int value) {
value = toVLQSigned(value);
do {
int digit = value & VLQ_BASE_MASK;
value >>>= VLQ_BASE_SHIFT;
if (value > 0) {
digit |= VLQ_CONTINUATION_BIT;
}
out.append(BASE64_MAP[digit]);
}
while (value > 0);
}
}
static final class SourceKey {
private final String sourcePath;
private final Object identityKey;
SourceKey(String sourcePath, Object identityKey) {
this.sourcePath = sourcePath;
this.identityKey = identityKey;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof SourceKey)) return false;
SourceKey key = (SourceKey) o;
if (!sourcePath.equals(key.sourcePath)) return false;
if (identityKey != null ? !identityKey.equals(key.identityKey) : key.identityKey != null) return false;
return true;
}
@Override
public int hashCode() {
int result = sourcePath.hashCode();
result = 31 * result + (identityKey != null ? identityKey.hashCode() : 0);
return result;
}
}
}
