org.jetbrains.kotlin.js.sourceMap.SourceMap3Builder.kt Maven / Gradle / Ivy
/*
* Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
* Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
*/
package org.jetbrains.kotlin.js.sourceMap
import gnu.trove.TObjectIntHashMap
import org.jetbrains.kotlin.js.parser.sourcemaps.*
import java.io.File
import java.io.IOException
import java.io.Reader
import java.util.function.Supplier
class SourceMap3Builder(
private val generatedFile: File?,
private val getCurrentOutputColumn: () -> Int,
private val pathPrefix: String
) : SourceMapBuilder {
private class ObjectIntHashMap : TObjectIntHashMap() {
override fun get(key: T): Int {
val index = index(key)
return if (index < 0) -1 else _values[index]
}
}
private val out = StringBuilder(8192)
private val sources = ObjectIntHashMap()
private val orderedSources = mutableListOf()
private val orderedSourceContentSuppliers = mutableListOf>()
private val names = ObjectIntHashMap()
private val orderedNames = mutableListOf()
private var previousNameIndex = 0
private var previousPreviousNameIndex = 0
private var previousGeneratedColumn = -1
private var previousSourceIndex = 0
private var previousSourceLine = 0
private var previousSourceColumn = 0
private var previousMappingOffset = 0
private var previousPreviousSourceIndex = 0
private var previousPreviousSourceLine = 0
private var previousPreviousSourceColumn = 0
private var currentMappingIsEmpty = true
override fun getOutFile() = File(generatedFile!!.parentFile, "${generatedFile.name}.map")
override fun build(): String {
val json = JsonObject()
json.properties["version"] = JsonNumber(3.0)
if (generatedFile != null)
json.properties["file"] = JsonString(generatedFile.name)
appendSources(json)
appendSourcesContent(json)
json.properties["names"] = JsonArray(
orderedNames.mapTo(mutableListOf()) { JsonString(it) }
)
json.properties["mappings"] = JsonString(out.toString())
return json.toString()
}
private fun appendSources(json: JsonObject) {
json.properties["sources"] = JsonArray(
orderedSources.mapTo(mutableListOf()) { JsonString(pathPrefix + it) }
)
}
private fun appendSourcesContent(json: JsonObject) {
json.properties["sourcesContent"] = JsonArray(
orderedSourceContentSuppliers.mapTo(mutableListOf()) {
try {
it.get().use { reader ->
if (reader != null)
JsonString(reader.readText())
else
JsonNull
}
} catch (e: IOException) {
System.err.println("An exception occurred during embedding sources into source map")
e.printStackTrace()
// can't close the content reader or read from it
JsonNull
}
}
)
}
override fun newLine() {
out.append(';')
previousGeneratedColumn = -1
}
override fun skipLinesAtBeginning(count: Int) {
out.insert(0, ";".repeat(count))
}
private fun getSourceIndex(source: String, fileIdentity: Any?, contentSupplier: Supplier): Int {
val key = SourceKey(source, fileIdentity)
var sourceIndex = sources[key]
if (sourceIndex == -1) {
sourceIndex = orderedSources.size
sources.put(key, sourceIndex)
orderedSources.add(source)
orderedSourceContentSuppliers.add(contentSupplier)
}
return sourceIndex
}
private fun getNameIndex(name: String): Int {
var nameIndex = names[name]
if (nameIndex == -1) {
nameIndex = orderedNames.size
names.put(name, nameIndex)
orderedNames.add(name)
}
return nameIndex
}
override fun addMapping(
source: String,
fileIdentity: Any?,
sourceContent: Supplier,
sourceLine: Int,
sourceColumn: Int,
name: String?,
) {
addMapping(source, fileIdentity, sourceContent, sourceLine, sourceColumn, name, getCurrentOutputColumn())
}
fun addMapping(
source: String,
fileIdentity: Any?,
sourceContent: Supplier,
sourceLine: Int,
sourceColumn: Int,
name: String?,
outputColumn: Int
) {
val sourceIndex = getSourceIndex(source.replace(File.separatorChar, '/'), fileIdentity, sourceContent)
val nameIndex = name?.let(this::getNameIndex) ?: -1
if (!currentMappingIsEmpty &&
previousSourceIndex == sourceIndex &&
previousSourceLine == sourceLine &&
previousSourceColumn == sourceColumn
) {
return
}
startMapping(outputColumn)
Base64VLQ.encode(out, sourceIndex - previousSourceIndex)
previousSourceIndex = sourceIndex
Base64VLQ.encode(out, sourceLine - previousSourceLine)
previousSourceLine = sourceLine
Base64VLQ.encode(out, sourceColumn - previousSourceColumn)
previousSourceColumn = sourceColumn
if (nameIndex >= 0) {
Base64VLQ.encode(out, nameIndex - previousNameIndex)
previousNameIndex = nameIndex
}
currentMappingIsEmpty = false
}
override fun addEmptyMapping() {
if (!currentMappingIsEmpty) {
startMapping(getCurrentOutputColumn())
currentMappingIsEmpty = true
}
}
private fun startMapping(column: Int) {
val newGroupStarted = previousGeneratedColumn == -1
if (newGroupStarted) {
previousGeneratedColumn = 0
}
val columnDiff = column - previousGeneratedColumn
if (!newGroupStarted) {
out.append(',')
}
if (columnDiff > 0 || newGroupStarted) {
Base64VLQ.encode(out, columnDiff)
previousGeneratedColumn = column
previousMappingOffset = out.length
previousPreviousSourceIndex = previousSourceIndex
previousPreviousSourceLine = previousSourceLine
previousPreviousSourceColumn = previousSourceColumn
previousPreviousNameIndex = previousNameIndex
} else {
out.setLength(previousMappingOffset)
previousSourceIndex = previousPreviousSourceIndex
previousSourceLine = previousPreviousSourceLine
previousSourceColumn = previousPreviousSourceColumn
previousNameIndex = previousPreviousNameIndex
}
}
private object Base64VLQ {
// A Base64 VLQ digit can represent 5 bits, so it is base-32.
private const val VLQ_BASE_SHIFT = 5
private const val VLQ_BASE = 1 shl VLQ_BASE_SHIFT
// A mask of bits for a VLQ digit (11111), 31 decimal.
private const val VLQ_BASE_MASK = VLQ_BASE - 1
// The continuation bit is the 6th bit.
private const val VLQ_CONTINUATION_BIT = VLQ_BASE
@Suppress("SpellCheckingInspection")
private val BASE64_MAP = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray()
private fun toVLQSigned(value: Int) =
if (value < 0) (-value shl 1) + 1 else value shl 1
fun encode(out: StringBuilder, value: Int) {
@Suppress("NAME_SHADOWING")
var value = toVLQSigned(value)
do {
var digit = value and VLQ_BASE_MASK
value = value ushr VLQ_BASE_SHIFT
if (value > 0) {
digit = digit or VLQ_CONTINUATION_BIT
}
out.append(BASE64_MAP[digit])
} while (value > 0)
}
}
private data class SourceKey(
private val sourcePath: String,
/**
* An object to distinguish different files with the same paths
*/
private val fileIdentity: Any?
)
}
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