mutating func planPossiblyIncrementalBuild()

in Sources/SwiftDriver/Jobs/Planning.swift [704:751]
38 lines of code
14 McCabe index (conditional complexity)

  /*private*/ mutating func planPossiblyIncrementalBuild() throws
  -> ([Job], IncrementalCompilationState?) {

    if let job = try immediateForwardingJob() {
      return ([job], nil)
    }

    // The REPL doesn't require input files, but all other modes do.
    guard !inputFiles.isEmpty || compilerMode == .repl || compilerMode == .intro else {
      if parsedOptions.hasArgument(.v) {
        // `swiftc -v` is allowed and prints version information.
        return ([], nil)
      }
      throw Error.noInputFiles
    }

    // Plan the build.
    switch compilerMode {
    case .repl:
      if !inputFiles.isEmpty {
        throw PlanningError.replReceivedInput
      }
      return ([try replJob()], nil)

    case .immediate:
      var jobs: [Job] = []
      try addPrecompileModuleDependenciesJobs(addJob: { jobs.append($0) })
      jobs.append(try interpretJob(inputs: inputFiles))
      return (jobs, nil)

    case .standardCompile, .batchCompile, .singleCompile:
      return try planStandardCompile()

    case .compilePCM:
      if inputFiles.count != 1 {
        throw PlanningError.emitPCMWrongInputFiles
      }
      return ([try generateEmitPCMJob(input: inputFiles.first!)], nil)

    case .dumpPCM:
      if inputFiles.count != 1 {
        throw PlanningError.dumpPCMWrongInputFiles
      }
      return ([try generateDumpPCMJob(input: inputFiles.first!)], nil)
    case .intro:
      return (try helpIntroJobs(), nil)
    }
  }