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link.scala
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link.scala
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import java.io.{File, PrintWriter}
import scala.annotation.tailrec
import scala.io.Source
import scala.util.Try
/**
* Provides a facility for "linking" Rholang source code. Linking is done
* by trans-piling extended Rholang source into standard Rholang source.
* The extended Rholang includes two new keywords: `export` and `import`.
* These two keywords work very similarly to the `new` keyword in standard
* Rholang, but `export` has the restriction that only a single
* name can be declared (i.e. `export x, y in { ... }` would
* be INVALID). Also note that `export` and `import` declarations can only
* appear at the "top level" of a file -- i.e. NOT inside `contract` definitions,
* bodies of `for` statements or `match` cases, etc. `export`s can
* use `import`s from other packages.
*
* When this linker is used on a Rholang source containing the
* `import` keyword, the import is mapped into a standard `new` statement, but with
* the code block following the `in` extended to include the code from
* the corresponding `export` declaration (which can, and should, reside in
* a separate file).
*
* Example:
* Let's say X.rho contains
* export X in { contract X(input, return) = { return( 2 * input ) } }
* and that Y.rho contains
* import X in { new Y in { contract Y(return) = { X(5, return) } } }
* Then linking Y.rho would result in the file Y.rho.linked with the contents
* new X in {
* contract X(input, return) = { return( 2 * input ) } |
* new Y in { contract Y(return) = { X(5, return) } }
* }
*
* USAGE: scala link.scala <libraryDirectory> <rholangSource> [<rholangSource> ...]
* Where <rholangSource> is a file to be linked with packages (i.e. imports resolved)
* and <libraryDirectory> is a directory with all the Rholang sources with
* `export` declarations.
*/
object RholangLinker {
def readRhoFile(f: File): String = {
Source.fromFile(f).getLines()
.map(_.split("//").headOption.getOrElse("")) //ignore comments
//.map(_.trim)
.filter(_.nonEmpty)
.mkString("\n")
}
def splitOnPars(code: String): Vector[String] = {
code.foldLeft((List.empty[BlockDef], Vector(""))){
case ((blockingList, currResult), c) =>
if (blockingList.isEmpty) {
c match {
case '|' => (Nil, currResult.padTo(currResult.length + 1, ""))
case b if b == BlockDef.brace.open =>
(BlockDef.brace :: blockingList, currResult.updated(currResult.length - 1, currResult.last + c))
case q if q == BlockDef.quote.open =>
(BlockDef.quote :: blockingList, currResult.updated(currResult.length - 1, currResult.last + c))
case _ => (blockingList, currResult.updated(currResult.length - 1, currResult.last + c))
}
} else {
val blocker = blockingList.head
c match {
case close if close == blocker.close =>
(blockingList.tail, currResult.updated(currResult.length - 1, currResult.last + c))
case b if b == BlockDef.brace.open =>
(BlockDef.brace :: blockingList, currResult.updated(currResult.length - 1, currResult.last + c))
case q if q == BlockDef.quote.open =>
(BlockDef.quote :: blockingList, currResult.updated(currResult.length - 1, currResult.last + c))
case _ => (blockingList, currResult.updated(currResult.length - 1, currResult.last + c))
}
}
}._2.map(_.trim)
}
def findCloseBrace(startIndex: Int, str: String): Int = {
val chars = str
.iterator
.zipWithIndex
.dropWhile{ case (_, i) => i <= startIndex }
@tailrec
def search(chars: Iterator[(Char, Int)], blockingList: List[BlockDef] = List(BlockDef.brace)): Int = {
val (c, i) = Try(chars.next()).getOrElse((' ', str.length))
if (blockingList.isEmpty || i == str.length) {
if(blockingList.nonEmpty){ throw new Exception("Imbalanced braces!") }
i - 1
} else {
val blocker = blockingList.head
c match {
case close if close == blocker.close => search(chars, blockingList.tail)
case b if b == BlockDef.brace.open && blocker.open != BlockDef.quote.open =>
search(chars, BlockDef.brace :: blockingList)
case q if q == BlockDef.quote.open => search(chars, BlockDef.quote :: blockingList)
case _ => search(chars, blockingList)
}
}
}
search(chars)
}
def parseNamedBlock(typ: String, code: String): Option[NamedBlock] = {
val blockStart = code.indexOf(typ)
val inIndex = code.indexOf("in ", blockStart)
if (blockStart < 0 || inIndex < 0) {
None
} else {
val name = code.slice(blockStart + typ.length, inIndex).trim()
val openBrace = code.indexOf("{", inIndex)
val closeBrace = findCloseBrace(openBrace, code)
val internalCode = code.slice(openBrace + 1, closeBrace).trim()
Some(NamedBlock(typ, name, parseRholang(internalCode)))
}
}
def parseRholang(code: String): Code = {
val split = splitOnPars(code)
if (split.length > 1) {
Par(split.map(parseRholang))
} else if (code.startsWith("export")) {
parseNamedBlock("export", code).getOrElse(Base(code))
} else if (code.startsWith("import")) {
parseNamedBlock("import", code).getOrElse(Base(code))
} else if (code.startsWith("new ")) {
parseNamedBlock("new", code).getOrElse(Base(code))
} else {
Base(code)
}
}
def findPackages(code: Code, acc: List[NamedBlock] = Nil): List[NamedBlock] = {
code match {
case b: Base => acc
case p: Par => acc ++ p.processes.toList.flatMap(c => findPackages(c))
case nb : NamedBlock if nb.typ == "export" => nb :: acc
case nb: NamedBlock => findPackages(nb.code) ++ acc
}
}
def readPackages(dir: String): (Vector[NamedBlock], Map[String, Vector[String]]) = {
val d = new File(dir)
val rhoFiles = if(d.exists && d.isDirectory) {
d.listFiles.filter(f => f.isFile && f.getName.endsWith("rho")).toVector
} else {
throw new Exception(s"$dir is not a directory!")
}
processPackageDependencies(
rhoFiles.flatMap(f => {
val code = parseRholang(readRhoFile(f))
findPackages(code)
})
)
}
def mapImports(
code: Code,
packages: Vector[NamedBlock],
dependencies: Map[String, Vector[String]]
): Code = {
@tailrec
def minimalDep(resolving: Iterator[String], dep: Set[String]): Set[String] = {
val newDeps = resolving
.flatMap(n => n +: dependencies(n))
.filter(n => !dep.contains(n))
.toSet
if(newDeps.nonEmpty) {
minimalDep(newDeps.iterator, dep ++ newDeps)
} else {
dep
}
}
val (unpackedCode, deps) = unpackImports(code)
val minDep = minimalDep(deps.iterator, Set.empty[String]).toVector
val packageCode = minDep.flatMap(n => packages.find(_.name == n).map(_.code))
if (packageCode.length != minDep.length) {
println("Warning! The following packages were not found in lib. directory:")
println(minDep.filter(n => packages.find(_.name == n).isEmpty).mkString(", "))
}
NamedBlock("new", minDep.mkString(", "), Par(packageCode :+ unpackedCode))
}
//Get at the core code -- leaving the imports as unbound names,
//rather than bound by the import. Return the new code as
//well as the names which are now unbound.
def unpackImports(code:Code, unboundNames: Vector[String] = Vector.empty[String]): (Code, Vector[String]) = {
code match {
case im: NamedBlock if im.typ == "import" =>
val names = im.name.split(",").map(_.trim).toVector
unpackImports(im.code, unboundNames ++ names)
case im: NamedBlock =>
val (unpackedCode, names) = unpackImports(im.code)
(NamedBlock(im.typ, im.name, unpackedCode), unboundNames ++ names)
case par: Par =>
val mappedParts = par.processes.map(p => unpackImports(p))
val totalNames = mappedParts.iterator.map(_._2).reduce(_ ++ _)
val newCode = Par(mappedParts.map(_._1))
(newCode, unboundNames ++ totalNames)
case b: Base => (b, unboundNames)
}
}
def processPackageDependencies(packages: Vector[NamedBlock]): (Vector[NamedBlock], Map[String, Vector[String]]) = {
val pkgAndDep = packages.map(p => {
val (code, dependencies) = unpackImports(p)
(code.asInstanceOf[NamedBlock], dependencies)
})
val pkgs = pkgAndDep.map(_._1)
val dependencyMap = pkgAndDep.iterator.map{
case (code, dependencies) => (code.name, dependencies)
}.toMap
(pkgs, dependencyMap)
}
def printUsage(): Unit = {
val usage = "USAGE: scala link.scala <libraryDirectory> <rholangSource> [<rholangSource> ...]"
println(usage)
}
def link(filename: String, packages: Vector[NamedBlock], dependencies: Map[String, Vector[String]]): Unit = {
val parsedInput = parseRholang(readRhoFile(new File(filename)))
val subedCode = mapImports(parsedInput, packages, dependencies)
val outFilename = filename + ".linked"
val output = new PrintWriter(outFilename)
output.println(subedCode.toString)
output.close()
println(s"Wrote $outFilename")
}
def main(args: Array[String]) : Unit = {
if (args.length < 2) {
printUsage()
} else {
val libDir = args.head
val (packages, dependencies) = readPackages(libDir)
if (dependencies.size != packages.length) {
throw new Exception("Error! Cannot have duplicate exports!")
}
val filenames = args.tail
filenames.foreach(f => link(f, packages, dependencies))
}
}
}
case class BlockDef(open: Char, close: Char)
object BlockDef {
val brace = BlockDef(123.toChar, 125.toChar)
val quote = BlockDef(34.toChar, 34.toChar)
}
sealed trait Code {
def numImports: Int
}
case class Par(processes: Vector[Code]) extends Code {
override def numImports: Int = processes.iterator.map(_.numImports).sum
override def toString: String = {
processes.map(_.toString).mkString(" | \n")
}
}
case class Base(code: String) extends Code {
override def numImports: Int = 0
override def toString: String = code
}
case class NamedBlock(typ: String, name: String, code: Code) extends Code {
override def numImports: Int = {
val baseNumber = if (typ == "import") 1 else 0
baseNumber + code.numImports
}
override def toString: String = {
s"new $name in {\n" + code.toString + "\n}"
}
}