org.jetbrains.kotlin.cli.js.internal.JSStdlibLinker.kt Maven / Gradle / Ivy

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/*
 * 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.
 */

@file:JvmName("JSStdlibLinker")

package org.jetbrains.kotlin.cli.js.internal

import com.google.gwt.dev.js.ThrowExceptionOnErrorReporter
import org.jetbrains.kotlin.js.backend.JsToStringGenerationVisitor
import org.jetbrains.kotlin.js.backend.ast.*
import org.jetbrains.kotlin.js.sourceMap.SourceMapBuilderConsumer
import org.jetbrains.kotlin.js.inline.util.fixForwardNameReferences
import org.jetbrains.kotlin.js.parser.parse
import org.jetbrains.kotlin.js.parser.sourcemaps.*
import org.jetbrains.kotlin.js.sourceMap.SourceFilePathResolver
import org.jetbrains.kotlin.js.sourceMap.SourceMap3Builder
import org.jetbrains.kotlin.js.util.TextOutputImpl
import java.io.File
import kotlin.system.exitProcess

fun main(args: Array) {
    val outputFile = File(args[0])
    val baseDir = File(args[1]).canonicalFile
    val wrapperFile = File(args[2])

    val inputPaths = args.drop(3).map { File(it) }
    mergeStdlibParts(outputFile, wrapperFile, baseDir, inputPaths)
}

/**
 * Combines several JS input files, that comprise Kotlin JS Standard Library,
 * into a single JS module.
 * The source maps of these files are combined into a single source map.
 */
private fun mergeStdlibParts(outputFile: File, wrapperFile: File, baseDir: File, inputPaths: List) {
    val program = JsProgram()

    fun File.makeRelativeIfNecessary(): String = canonicalFile.toRelativeString(baseDir)

    val wrapper = parse(wrapperFile.readText(), ThrowExceptionOnErrorReporter, program.scope, wrapperFile.makeRelativeIfNecessary())
        ?: error("Should not be null because of error reporter")
    val insertionPlace = wrapper.createInsertionPlace()

    val allFiles = mutableListOf()
    inputPaths.forEach { collectFiles(it, allFiles) }

    for (file in allFiles) {
        val statements = parse(file.readText(), ThrowExceptionOnErrorReporter, program.scope, file.makeRelativeIfNecessary())
            ?: error("Should not be null because of error reporter")
        val block = JsBlock(statements)
        block.fixForwardNameReferences()

        val sourceMapFile = File(file.parent, file.name + ".map")
        if (sourceMapFile.exists()) {
            when (val sourceMapParse = SourceMapParser.parse(sourceMapFile)) {
                is SourceMapError -> {
                    System.err.println("Error parsing source map file $sourceMapFile: ${sourceMapParse.message}")
                    exitProcess(1)
                }

                is SourceMapSuccess -> {
                    val sourceMap = sourceMapParse.value
                    val remapper = SourceMapLocationRemapper(sourceMap)
                    remapper.remap(block)
                }
            }
        }

        insertionPlace.statements += statements
    }

    program.globalBlock.statements += wrapper

    val sourceMapFile = File(outputFile.parentFile, outputFile.name + ".map")
    val textOutput = TextOutputImpl()
    val sourceMapBuilder = SourceMap3Builder(outputFile, textOutput::getColumn, "")
    val consumer = SourceMapBuilderConsumer(
        File("."),
        sourceMapBuilder,
        SourceFilePathResolver(mutableListOf()),
        provideCurrentModuleContent = true,
        provideExternalModuleContent = true
    )
    program.globalBlock.accept(JsToStringGenerationVisitor(textOutput, consumer))
    val sourceMapContent = sourceMapBuilder.build()

    val programText = textOutput.toString()

    outputFile.writeText(programText + "\n//# sourceMappingURL=${sourceMapFile.name}\n")

    val sourceMapJson = parseJson(sourceMapContent)
    val sources = (sourceMapJson as JsonObject).properties["sources"] as JsonArray

    sourceMapJson.properties["sourcesContent"] = JsonArray(*sources.elements.map { sourcePath ->
        val sourceFile = File((sourcePath as JsonString).value)
        if (sourceFile.exists()) {
            JsonString(sourceFile.readText())
        } else {
            JsonNull
        }
    }.toTypedArray())

    sourceMapFile.writeText(sourceMapJson.toString())
}

private fun List.createInsertionPlace(): JsBlock {
    val block = JsCompositeBlock()

    val visitor = object : JsVisitorWithContextImpl() {
        override fun visit(x: JsExpressionStatement, ctx: JsContext): Boolean {
            return if (isInsertionPlace(x.expression)) {
                ctx.replaceMe(block)
                false
            } else {
                super.visit(x, ctx)
            }
        }

        private fun isInsertionPlace(expression: JsExpression): Boolean {
            if (expression !is JsInvocation || expression.arguments.isNotEmpty()) return false

            val qualifier = expression.qualifier
            if (qualifier !is JsNameRef || qualifier.qualifier != null) return false
            return qualifier.ident == "insertContent"
        }
    }

    for (statement in this) {
        visitor.accept(statement)
    }
    return block
}

private fun collectFiles(rootFile: File, target: MutableList) {
    if (rootFile.isDirectory) {
        for (child in (rootFile.listFiles() ?: error("Problem with listing files in $rootFile")).sorted()) {
            collectFiles(child, target)
        }
    } else if (rootFile.extension == "js") {
        target += rootFile
    }
}