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Refactoring.scala
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Refactoring.scala
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// Copyright: 2010 - 2017 https://github.com/ensime/ensime-server/graphs
// License: http://www.gnu.org/licenses/gpl-3.0.en.html
package org.ensime.core
import java.nio.charset.Charset
import org.ensime.api._
import org.ensime.util.FileUtils._
import org.ensime.util._
import org.ensime.util.file.File
import scala.tools.nsc.io.AbstractFile
import scala.tools.refactoring._
import scala.tools.refactoring.analysis.GlobalIndexes
import scala.tools.refactoring.common.{ Change, CompilerAccess, RenameSourceFileChange }
import scala.tools.refactoring.implementations._
abstract class RefactoringEnvironment(file: String, start: Int, end: Int) {
val refactoring: MultiStageRefactoring with CompilerAccess
def performRefactoring(
procId: Int,
tpe: RefactorType,
parameters: refactoring.RefactoringParameters
)(implicit charset: Charset): Either[RefactorFailure, RefactorDiffEffect] = {
def transformToDiff(modifications: List[Change]): Either[RefactorFailure, RefactorDiffEffect] = {
val renameChange = modifications.collectFirst { case ch: RenameSourceFileChange => ch }
val renameTarget = renameChange.map {
ch =>
val sourceFile = ch.sourceFile
val fullNewName = sourceFile.path.replace(sourceFile.name, ch.to)
(sourceFile.file, File(fullNewName))
}
val edits = modifications.flatMap(FileEditHelper.fromChange).sorted
writeDiffChanges(edits, renameTarget) match {
case Right(diff) => Right(new RefactorDiffEffect(procId, tpe, diff))
case Left(err) => Left(RefactorFailure(procId, err.toString))
}
}
val af = AbstractFile.getFile(file)
refactoring.compilationUnitOfFile(af) match {
case Some(cu) =>
val selection = new refactoring.FileSelection(af, cu.body, start, end)
refactoring.prepare(selection) match {
case Right(prepare) =>
refactoring.perform(selection, prepare, parameters) match {
case Right(modifications) => transformToDiff(modifications)
case Left(error) => Left(RefactorFailure(procId, error.cause))
}
case Left(error) => Left(RefactorFailure(procId, error.cause))
}
case None =>
Left(RefactorFailure(procId, "Compilation unit not found: " + af))
}
}
}
trait RefactoringHandler { self: Analyzer =>
implicit def cs: Charset = charset
def handleRefactorRequest(req: RefactorReq): RpcResponse =
scalaCompiler.askDoRefactor(req.procId, req.params) match {
case Right(success) => success
case Left(failure) => failure
}
}
trait RefactoringControl { self: RichCompilerControl with RefactoringImpl =>
def askDoRefactor(
procId: Int,
refactor: RefactorDesc
): Either[RefactorFailure, RefactorDiffEffect] = {
askOption(doRefactor(procId, refactor)).getOrElse(Left(RefactorFailure(procId, "Refactor call failed")))
}
}
trait RefactoringImpl extends ScalaRefactoringBackCompat {
self: RichPresentationCompiler =>
import org.ensime.util.FileUtils._
protected def doRename(procId: Int, tpe: RefactorType, name: String, file: File, start: Int, end: Int) =
new RefactoringEnvironment(file.getPath, start, end) {
val refactoring = new Rename with GlobalIndexes {
val global = RefactoringImpl.this
val invalidSet = toBeRemoved.synchronized { toBeRemoved.toSet }
val cuIndexes = this.global.activeUnits().map { u => CompilationUnitIndex(u.body) }
val index = GlobalIndex(cuIndexes)
}
val result = performRefactoring(procId, tpe, name)
}.result
protected def doExtractMethod(procId: Int, tpe: RefactorType,
name: String, file: File, start: Int, end: Int) =
new RefactoringEnvironment(file.getPath, start, end) {
val refactoring = new ExtractMethod with GlobalIndexes {
val global = RefactoringImpl.this
val cuIndexes = this.global.activeUnits().map { u => CompilationUnitIndex(u.body) }
val index = GlobalIndex(cuIndexes)
}
val result = performRefactoring(procId, tpe, name)
}.result
protected def doExtractLocal(procId: Int, tpe: RefactorType,
name: String, file: File, start: Int, end: Int) =
new RefactoringEnvironment(file.getPath, start, end) {
val refactoring = new ExtractLocal with GlobalIndexes {
val global = RefactoringImpl.this
val cuIndexes = this.global.activeUnits().map { u => CompilationUnitIndex(u.body) }
val index = GlobalIndex(cuIndexes)
}
val result = performRefactoring(procId, tpe, name)
}.result
protected def doInlineLocal(procId: Int, tpe: RefactorType, file: File,
start: Int, end: Int) =
new RefactoringEnvironment(file.getPath, start, end) {
val refactoring = new InlineLocal with GlobalIndexes {
val global = RefactoringImpl.this
val cuIndexes = this.global.activeUnits().map { u => CompilationUnitIndex(u.body) }
val index = GlobalIndex(cuIndexes)
}
val result = performRefactoring(procId, tpe, new refactoring.RefactoringParameters())
}.result
protected def doOrganizeImports(procId: Int, tpe: RefactorType, file: File) =
new RefactoringEnvironment(file.getPath, 0, 0) {
val refactoring = new OrganizeImports {
val global = RefactoringImpl.this
}
val result = performRefactoring(procId, tpe, new refactoring.RefactoringParameters(
options = organizeImportOptions(refactoring),
config = Some(OrganizeImports.OrganizeImportsConfig(
importsStrategy = Some(OrganizeImports.ImportsStrategy.CollapseImports),
groups = List("java", "scala")
))
))
}.result
protected def doAddImport(procId: Int, tpe: RefactorType, qualName: String, file: File) = {
val refactoring = new AddImportStatement {
val global = RefactoringImpl.this
}
val af = AbstractFile.getFile(file.getPath)
val modifications = refactoring.addImport(af, qualName)
val edits = modifications.flatMap(FileEditHelper.fromChange)
writeDiffChanges(edits)(charset) match {
case Right(diff) => Right(new RefactorDiffEffect(procId, tpe, diff))
case Left(err) => Left(RefactorFailure(procId, err.toString))
}
}
protected def reloadAndType(f: File) = reloadAndTypeFiles(List(this.createSourceFile(f.getPath)))
protected def doRefactor(procId: Int, refactor: RefactorDesc): Either[RefactorFailure, RefactorDiffEffect] = {
val tpe = refactor.refactorType
try {
refactor match {
case InlineLocalRefactorDesc(file, start, end) =>
reloadAndType(file)
doInlineLocal(procId, tpe, file, start, end)
case RenameRefactorDesc(newName, file, start, end) =>
reloadAndType(file)
doRename(procId, tpe, newName, file, start, end)
case ExtractMethodRefactorDesc(methodName, file, start, end) =>
reloadAndType(file)
doExtractMethod(procId, tpe, methodName, file, start, end)
case ExtractLocalRefactorDesc(name, file, start, end) =>
reloadAndType(file)
doExtractLocal(procId, tpe, name, file, start, end)
case OrganiseImportsRefactorDesc(file) =>
reloadAndType(file)
doOrganizeImports(procId, tpe, file)
case AddImportRefactorDesc(qualifiedName, file) =>
reloadAndType(file)
doAddImport(procId, tpe, qualifiedName, file)
}
} catch {
case e: Throwable =>
logger.error("Error during refactor request: " + refactor, e)
Left(RefactorFailure(procId, e.toString))
}
}
}