まぁREPL限定*1 かつ 標準のライブラリではない*2ですが(´・ω・`)
ちなみに、実行したのは、version2.8.1です
追記:
2.9ではこのままでは動かないらしいですよ！*3twitterが作ってるEvalというライブラリがあるので、実用するならまだこっちのほうがいいかも
https://github.com/twitter/util/tree/master/util-eval google:twitter util Eval
以下、実行結果まるまる貼りつけ↓
scalaのREPLは、
:power
と打つと、普段使わない*4コンパイラまわりのAPIが使えるようになります。上の
:power
と打ったあとの表示結果にあるように、
scala.tools.nsc. 以下が名前空間に入り、また、
- repl
- global
- power
という名前のオブジェクトが、存在するようになるみたいです
たとえば、globalというオブジェクトのメソッドがこんな感じ↓
scala> global.
Display all 322 possibilities? (y or n)
Alternative Annotated
AnnotatedType AnnotationInfo
AntiPolyType AppliedTypeTree
Apply ApplyDynamic
ApproximateDependentMap ArrayAnnotArg
ArrayValue Assign
AssignOrNamedArg Bind
Block BooleanTag
BoundedWildcardType ByteTag
CaseDef CharTag
ClassDef ClassInfoType
ClassTag CompoundTypeTree
ConsoleWriter Constant
ConstantType CyclicInheritance
CyclicReference DefDef
DocComment DocDef
DoubleTag EmptyScope
EmptyTree EmptyTreeTypeSubstituter
EnumTag ErroneousCollector
ErrorType ExistentialType
ExistentialTypeTree FloatTag
Function GlbFailure
Ident IdentityTypeMap
If Import
ImportSelector IntTag
IsDependentCollector JavaMethodType
LabelDef LazyAnnotationInfo
Literal LiteralAnnotArg
LongTag LubGlbMargin
Match MaxPhases
MethodType Modifiers
ModuleDef NamedType
NestedAnnotArg New
NoMods NoPeriod
NoPosition NoPrefix
NoRunId NoSymbol
NoTag NoType
NotNullType NullTag
OverloadedType PackageDef
Parens PolyType
RefinedType Return
ScalaSigBytes Select
SelectFromArray SelectFromTypeTree
ShortTag SingleType
SingletonTypeTree Star
StringTag StripAnnotationsMap
Super SuperType
Template This
ThisType Throw
Try TypeApply
TypeBounds TypeBoundsTree
TypeDef TypeRef
TypeTree TypeTreeWithDeferredRefCheck
TypeVar Typed
UnApply UnitTag
UseCase ValDef
WildcardType abort
activeLocks activeLocks_=
adaptAnnotations adaptBoundsToAnnotations
adaptToNewRunMap addAnnotationChecker
addAnnotations addMember
annotationsConform annotationsGlb
annotationsLub appliedType
asCompactString asInstanceOf
asString atPhase
atPos baseTypeSingletonSeq
beginsWithTypeVarOrIsRefined buildCompilerFromPhasesSet
canAdaptAnnotations catchWith
checkKindBounds0 chrs
chrs_= classPath
classfileAnnotArgManifest cloneSymbols
commonOwnerMap compactify
compare compoundBaseTypeSeq
computePluginPhases containsContravariantExistentialCollector
containsCovariantExistentialCollector cookedDocComment
copyMethodType copyRefinedType
createJavadoc currentPeriod
currentRun currentRunId
deAlias debugString
definitions differentOrNone
docComment docCommentPos
docComments dropSingletonType
emptySymbolArray emptyValDef
encode ensureNonOverlapping
error existentialAbstraction
expandVariables expandWiki
expandedDocComment explainTypes
forJVM forMSIL
getFile getSourceFile
glb globalPhase
globalPhase_= infoTransformers
infoTransformers_= inform
informProgress informTime
instTypeVar instantiatedBounds
intersectionType intersectionWitness
isConstantType isDifferentType
isDifferentTypeConstructor isErrorOrWildcard
isHKSubType0 isInstanceOf
isNumericSubType isPopulated
isRaw isRawType
isSameType isSameType2
isSameTypes isScriptRun
isSingleType isSubArgs
isSubType isSubTypes
isValid isValidForBaseClasses
isWeakSubType isWithinBounds
kindsConform loadPlugins
loadRoughPluginsList loaders
log logError
lookupVariable lub
lubDepth map2Conserve
matchesType maxTostringRecursions
merge mergePrefixAndArgs
missingAliasException mkTermName
mkTypeName nameChars
nameDebug needsOuterTest
newCompactTreePrinter newScope
newStandardTreePrinter newTermName
newTreePrinter newTypeName
nme nodeToString
normalizePlus notifyImport
numericGlb numericLub
objToAny onlyPresentation
period phase
phaseDescriptions phaseDescriptors
phaseId phaseNames
phaseOf phaseWithId
phase_= platform
pluginDescriptions pluginOptionsHelp
plugins polyType
posAssigner printAllUnits
printTypings printTypings_=
rangePos rawDocComment
rawToExistential refinedType
registerContext registerTopLevelSym
removeAllAnnotationCheckers reporter
reporter_= resetAllAttrs
resetLocalAttrs resetPos
rootLoader roughPluginsList
runId sanitize
settings settings_=
shorthands showDef
showOuterTests signalDone
singleType singletonBounds
skolemizationLevel skolemizationLevel_=
sn solve
spanningTypes specializesSym
startRun superComment
symbolCount toJavaDoc
toString trackSetInfo
treeBrowser treeCopy
treeInfo treePrinter
treeWrapper tryWith
typeParamsToExistentials typeRef
typeVarToOriginMap undetBaseTypeSeq
undoLog uniqueTypeCount
useCases validatePositions
verifyAndPrioritize view
warning weakGlb
weakLub wildcardToTypeVarMap
withTypesExplained wrappingPos
replのメソッド↓
ComputedImports$module DBG InterpreterEvalException InterpreterEvalException$module ReqAndHandler$1 addWrapper$1 aliasForType allBoundNames allImplicits allSeenTypes allUsedNames allValueGeneratingNames asInstanceOf beQuietDuring bind bitmap$0 classLoader clazzForIdent close compileAndSaveRun compileSources compileString compiler compilerClasspath completionAware completionAwareImplicit equals eval evalError evalExpr extractionValueForIdent getClass getClassObject getInterpreterClassLoader getSynthVarName getVarName hashCode implicitFor indentCode indentString initialize interpret interpretExpr isCompletionDebug isInstanceOf isReplDebug isettings manifestFor methodsOf mostRecentVar name2string newCompiler notify notifyAll parentClassLoader power power$module printAllTypeOf printResults printResults_= println quietBind recordRequest reporter reporter$module reset resetClassLoader scala$tools$nsc$Interpreter$$ComputedImports scala$tools$nsc$Interpreter$$_initialize scala$tools$nsc$Interpreter$$asCompletionAwareCode scala$tools$nsc$Interpreter$$bindLastException scala$tools$nsc$Interpreter$$bindLastException_= scala$tools$nsc$Interpreter$$boundNameMap scala$tools$nsc$Interpreter$$chooseHandler scala$tools$nsc$Interpreter$$clean scala$tools$nsc$Interpreter$$getOriginalName scala$tools$nsc$Interpreter$$importsCode scala$tools$nsc$Interpreter$$isGeneratedVarName scala$tools$nsc$Interpreter$$isSynthVarName scala$tools$nsc$Interpreter$$loadByName scala$tools$nsc$Interpreter$$out scala$tools$nsc$Interpreter$$parse scala$tools$nsc$Interpreter$$prevRequests scala$tools$nsc$Interpreter$$spaces scala$tools$nsc$Interpreter$$synthVarNameCreator scala$tools$nsc$Interpreter$$usedNameMap setContextClassLoader settings stringToCompilerType toString typeForIdent unleash unqualifiedIds virtualDirectory wait wildcardImportedTypes withoutBindingLastException
compileSourcesとか、classLoaderとか言う名前のメソッドがあって、面白そうですね(・∀・)
おそらく、scalaの言語自体の開発者向けとか、コンパイラプラグイン作成者のためにある機能なんですかね？
追記
やっぱりpowerモードは予想どうりコンパイラプラグインとか作る人向けっぽ
foursquareで働いてるらしい、scala-timeの作者の人のtweet ↓
Scala Protip: When writing a compiler plugin, the REPL's :power mode is your friend. This shit is like dark magic... (Thanks @extempore2!)
Jorge Ortiz
jorgeortiz85
dark magic・・・(・ω・*) scalaちゃんは黒魔法 power を唱えた的な・・・
