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Adaptation of apache#21495
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repl/scala-2.11/src/main/scala/org/apache/spark/repl/SparkExprTyper.scala
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| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one or more | ||
| * contributor license agreements. See the NOTICE file distributed with | ||
| * this work for additional information regarding copyright ownership. | ||
| * The ASF licenses this file to You under the Apache License, Version 2.0 | ||
| * (the "License"); you may not use this file except in compliance with | ||
| * the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
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| package org.apache.spark.repl | ||
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| import scala.tools.nsc.interpreter.{ExprTyper, IR} | ||
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| trait SparkExprTyper extends ExprTyper { | ||
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| import repl._ | ||
| import global.{reporter => _, Import => _, _} | ||
| import naming.freshInternalVarName | ||
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| def doInterpret(code: String): IR.Result = { | ||
| // interpret/interpretSynthetic may change the phase, | ||
| // which would have unintended effects on types. | ||
| val savedPhase = phase | ||
| try interpretSynthetic(code) finally phase = savedPhase | ||
| } | ||
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| override def symbolOfLine(code: String): Symbol = { | ||
| def asExpr(): Symbol = { | ||
| val name = freshInternalVarName() | ||
| // Typing it with a lazy val would give us the right type, but runs | ||
| // into compiler bugs with things like existentials, so we compile it | ||
| // behind a def and strip the NullaryMethodType which wraps the expr. | ||
| val line = "def " + name + " = " + code | ||
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| doInterpret(line) match { | ||
| case IR.Success => | ||
| val sym0 = symbolOfTerm(name) | ||
| // drop NullaryMethodType | ||
| sym0.cloneSymbol setInfo exitingTyper(sym0.tpe_*.finalResultType) | ||
| case _ => NoSymbol | ||
| } | ||
| } | ||
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| def asDefn(): Symbol = { | ||
| val old = repl.definedSymbolList.toSet | ||
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| doInterpret(code) match { | ||
| case IR.Success => | ||
| repl.definedSymbolList filterNot old match { | ||
| case Nil => NoSymbol | ||
| case sym :: Nil => sym | ||
| case syms => NoSymbol.newOverloaded(NoPrefix, syms) | ||
| } | ||
| case _ => NoSymbol | ||
| } | ||
| } | ||
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| def asError(): Symbol = { | ||
| doInterpret(code) | ||
| NoSymbol | ||
| } | ||
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| beSilentDuring(asExpr()) orElse beSilentDuring(asDefn()) orElse asError() | ||
| } | ||
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| } |
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