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/* __ *\
** ________ ___ / / ___ __ ____ Scala.js tools **
** / __/ __// _ | / / / _ | __ / // __/ (c) 2013-2014, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ |/_// /_\ \ http://scala-js.org/ **
** /____/\___/_/ |_/____/_/ | |__/ /____/ **
** |/____/ **
\* */
package scala.scalajs.tools.sourcemap
import scala.annotation.tailrec
import scala.collection.mutable
import java.io._
import java.util.regex.Pattern
import java.net.{ URI, URISyntaxException }
import scala.scalajs.ir.Position
import scala.scalajs.tools.{javascript => js}
import scala.scalajs.tools.io._
import scala.scalajs.tools.optimizer.JSTreeBuilder
class JSFileBuilder(val name: String,
protected val outputWriter: Writer) extends JSTreeBuilder {
def addLine(line: String): Unit = {
outputWriter.write(line)
outputWriter.write('\n')
}
def addLines(lines: Seq[String]): Unit =
lines.foreach(addLine)
def addFile(file: VirtualJSFile): Unit =
addPartsOfFile(file)(!_.startsWith("//# sourceMappingURL="))
def addPartsOfFile(file: VirtualJSFile)(selector: String => Boolean): Unit = {
for (line <- file.readLines() if selector(line))
addLine(line)
}
/** Add a JavaScript tree representing a statement.
* The tree must be a valid JavaScript tree (typically obtained by
* desugaring a full-fledged IR tree).
*/
def addJSTree(tree: js.Trees.Tree): Unit = {
val printer = new js.Printers.JSTreePrinter(outputWriter)
printer.printTopLevelTree(tree)
// Do not close the printer: we do not have ownership of the writers
}
/** Closes the underlying writer(s).
*/
def closeWriters(): Unit = {
outputWriter.close()
}
}
class JSFileBuilderWithSourceMapWriter(n: String, ow: Writer,
protected val sourceMapWriter: SourceMapWriter)
extends JSFileBuilder(n, ow) {
override def addLine(line: String): Unit = {
super.addLine(line)
sourceMapWriter.nextLine()
}
private final val NotSelected = -1
override def addPartsOfFile(file: VirtualJSFile)(
selector: String => Boolean): Unit = {
val br = new BufferedReader(file.reader)
try {
// Select lines, and remember offsets
val offsets = new mutable.ArrayBuffer[Int] // (maybe NotSelected)
val selectedLineLengths = new mutable.ArrayBuffer[Int]
var line: String = br.readLine()
var selectedCount = 0
while (line != null) {
if (selector(line)) {
super.addLine(line) // super call not to advance line in source map
offsets += selectedCount
selectedLineLengths += line.length
selectedCount += 1
} else {
offsets += NotSelected
}
line = br.readLine()
}
/* We ignore a potential source map.
* This happens typically for corejslib.js and other helper files
* written directly in JS.
* We generate a fake line-by-line source map for these on the fly
*/
val sourceFile = file.toURI
for (lineNumber <- 0 until offsets.size) {
val offset = offsets(lineNumber)
if (offset != NotSelected) {
val originalPos = Position(sourceFile, lineNumber, 0)
sourceMapWriter.startNode(0, originalPos, None)
sourceMapWriter.endNode(selectedLineLengths(offset))
sourceMapWriter.nextLine()
}
}
} finally {
br.close()
}
}
override def addJSTree(tree: js.Trees.Tree): Unit = {
val printer = new js.Printers.JSTreePrinterWithSourceMap(
outputWriter, sourceMapWriter)
printer.printTopLevelTree(tree)
// Do not close the printer: we do not have ownership of the writers
}
override def complete(): Unit = {
super.complete()
sourceMapWriter.complete()
}
}
class JSFileBuilderWithSourceMap(n: String, ow: Writer,
sourceMapOutputWriter: Writer,
relativizeSourceMapBasePath: Option[URI] = None)
extends JSFileBuilderWithSourceMapWriter(
n, ow,
new SourceMapWriter(sourceMapOutputWriter, n,
relativizeSourceMapBasePath)) {
override def complete(): Unit = {
addLine("//# sourceMappingURL=" + name + ".map")
super.complete()
}
override def closeWriters(): Unit = {
super.closeWriters()
sourceMapOutputWriter.close()
}
}
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