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Rewrite Map.zip -> Map.zip.toMap #62

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Rewrite Map.zip -> Map.zip.toMap #62

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22fcbcb
Rewrite Map.zip -> Map.zip.toMap
MasseGuillaume Jun 25, 2018
5af2308
Rewrite Map.zip. make sure we target Map
MasseGuillaume Jun 25, 2018
9804a16
Rewrite: TypeMatcher warning about hack
MasseGuillaume Jun 25, 2018
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2 changes: 2 additions & 0 deletions scalafix/input/src/main/scala/fix/SetMapSrc.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -9,4 +9,6 @@ class SetMapSrc(set: Set[Int], map: Map[Int, Int]) {
(set + (2, 3)).map(x => x)
set + (2, 3) - 4
map.mapValues(_ + 1)
map.zip(List())
List().zip(List())
}
2 changes: 2 additions & 0 deletions scalafix/output/src/main/scala/fix/SetMapSrc.scala
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Expand Up @@ -9,4 +9,6 @@ class SetMapSrc(set: Set[Int], map: Map[Int, Int]) {
(set + 2 + 3).map(x => x)
set + 2 + 3 - 4
map.mapValues(_ + 1).toMap
map.zip(List()).toMap
List().zip(List())
}
38 changes: 36 additions & 2 deletions scalafix/rules/src/main/scala/fix/Scalacollectioncompat_newcollections.scala
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Expand Up @@ -8,6 +8,28 @@ import scala.meta._
case class Scalacollectioncompat_newcollections(index: SemanticdbIndex)
extends SemanticRule(index, "Scalacollectioncompat_newcollections") {

// WARNING: TOTAL HACK
// this is only to unblock us until Term.tpe is available: https://github.com/scalameta/scalameta/issues/1212
// if we have a simple identifier, we can look at his definition at query it's type
// this should be improved in future version of scalameta
object TypeMatcher {
def apply(symbols: Symbol*)(implicit index: SemanticdbIndex): TypeMatcher =
new TypeMatcher(symbols: _*)(index)
}

final class TypeMatcher(symbols: Symbol*)(implicit index: SemanticdbIndex) {
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Do you mind adding some documentation?

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Yes please, in particular highlight in caps lock that this is not The Real Deal. This is only to unblock tests, I would in fact prefer if this was not merged into master because users should not run this.

def unapply(tree: Tree): Boolean = {
index.denotation(tree)
.exists(_.names.headOption.exists(n => symbols.exists(_ == n.symbol)))
}
}

val CollectionMap: TypeMatcher = TypeMatcher(
Symbol("_root_.scala.collection.immutable.Map#"),
Symbol("_root_.scala.collection.mutable.Map#"),
Symbol("_root_.scala.Predef.Map#")
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Can you add HashMap and TreeMap as well?

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I would rather not dig that hole too deep. The idea is to document what is the expected type, not to have a working rule.

)

def replaceSymbols(ctx: RuleCtx): Patch = {
ctx.replaceSymbols(
"scala.collection.LinearSeq" -> "scala.collection.immutable.List",
Expand Down Expand Up @@ -77,11 +99,17 @@ case class Scalacollectioncompat_newcollections(index: SemanticdbIndex)
Symbol("_root_.scala.collection.mutable.SetLike.retain.")
)


val arrayBuilderMake =
SymbolMatcher.normalized(
Symbol("_root_.scala.collection.mutable.ArrayBuilder.make(Lscala/reflect/ClassTag;)Lscala/collection/mutable/ArrayBuilder;.")
)

val mapZip =
SymbolMatcher.exact(
Symbol("_root_.scala.collection.IterableLike#zip(Lscala/collection/GenIterable;Lscala/collection/generic/CanBuildFrom;)Ljava/lang/Object;.")
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It looks like it’s going to match any call to zip, even if the receiver is not of type Map[_, _].

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then we are blocked by scalameta/scalameta#1212

)

def replaceMutableSet(ctx: RuleCtx) =
ctx.tree.collect {
case retainSet(n: Name) =>
Expand Down Expand Up @@ -254,10 +282,16 @@ case class Scalacollectioncompat_newcollections(index: SemanticdbIndex)
case ap @ Term.Apply(at @ Term.ApplyType(Term.Select(lhs, arrayBuilderMake(_)), args), Nil) =>
val extraParens =
ap.tokens.slice(at.tokens.size, ap.tokens.size)

ctx.removeTokens(extraParens)
}.asPatch
}

def replaceMapZip(ctx: RuleCtx): Patch = {
ctx.tree.collect {
case ap @ Term.Apply(Term.Select(CollectionMap(), mapZip(_)), List(_)) =>
ctx.addRight(ap, ".toMap")
}.asPatch
}

def replaceMapMapValues(ctx: RuleCtx): Patch = {
ctx.tree.collect {
Expand All @@ -280,7 +314,7 @@ case class Scalacollectioncompat_newcollections(index: SemanticdbIndex)
replaceMutMapUpdated(ctx) +
replaceIterableSameElements(ctx) +
replaceArrayBuilderMake(ctx) +
replaceMapZip(ctx) +
replaceMapMapValues(ctx)

}
}