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fix: don't break using-directives by an auto-import for
.sc in scal…
…a-cli (scalameta#4291) Scala-cli wraps `.sc` files in a similar way as ammonite - puts it in object so the resulting code in pc is: ``` object main { /*script*///> using directive //> using directive ... } ```
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103 changes: 103 additions & 0 deletions
103
mtags/src/main/scala/scala/meta/internal/pc/ScriptFirstImportPosition.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| package scala.meta.internal.pc | ||
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| import scala.annotation.tailrec | ||
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| import scala.meta._ | ||
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| /** | ||
| * Used to determine the position for the first import for scala-cli `.scala` and `.sc` files. | ||
| * For scala-cli sources we need to skip `//> using` comments. | ||
| * | ||
| * For `.sc` Ammonite and Scala-Cli wraps the code for such files. | ||
| * The following code: | ||
| * ```scala | ||
| * val a = 1 | ||
| * ``` | ||
| * Is trasnformed and passed into PC as: | ||
| * ```scala | ||
| * ${tool-defauls-imports} | ||
| * object ${wrapperObject} { | ||
| * /*<${scriptMarker}>*/ | ||
| * val a = 1 <-- actual code | ||
| * } | ||
| * ``` | ||
| * To find the proper position we need to find the object that contains `/*<${scriptMarker}>*/` | ||
| */ | ||
| object ScriptFirstImportPosition { | ||
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| val usingDirectives: List[String] = List("// using", "//> using") | ||
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| def ammoniteScStartOffset(text: String): Option[Int] = { | ||
| val it = tokenize(text).iterator | ||
| startMarkerOffset(it, "/*<start>*/").map(_ + 1) | ||
| } | ||
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| def scalaCliScStartOffset(text: String): Option[Int] = { | ||
| val iterator = tokenize(text).iterator | ||
| startMarkerOffset(iterator, "/*<script>*/").map { startOffset => | ||
| val offset = | ||
| skipUsingDirectivesOffset(iterator, None) | ||
| .getOrElse(startOffset) | ||
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| offset + 1 | ||
| } | ||
| } | ||
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| def skipUsingDirectivesOffset(text: String): Int = { | ||
| val it = tokenize(text).iterator | ||
| if (it.hasNext) { | ||
| it.next() match { | ||
| case _: Token.BOF => | ||
| skipUsingDirectivesOffset(it, None) | ||
| .map(_ + 1) | ||
| .getOrElse(0) | ||
| case _ => 0 | ||
| } | ||
| } else 0 | ||
| } | ||
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| @tailrec | ||
| private def startMarkerOffset( | ||
| it: Iterator[Token], | ||
| comment: String | ||
| ): Option[Int] = { | ||
| if (it.hasNext) { | ||
| it.next() match { | ||
| case t: Token.Comment => | ||
| if (t.text == comment) Some(t.pos.end) | ||
| else startMarkerOffset(it, comment) | ||
| case _ => startMarkerOffset(it, comment) | ||
| } | ||
| } else None | ||
| } | ||
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| @tailrec | ||
| private def skipUsingDirectivesOffset( | ||
| it: Iterator[Token], | ||
| lastOffset: Option[Int] | ||
| ): Option[Int] = { | ||
| if (it.hasNext) { | ||
| it.next match { | ||
| case t: Token.Comment | ||
| if usingDirectives.exists(prefix => t.text.startsWith(prefix)) => | ||
| skipUsingDirectivesOffset(it, Some(t.pos.end)) | ||
| case t if isWhitespace(t) => | ||
| skipUsingDirectivesOffset(it, lastOffset) | ||
| case _ => | ||
| lastOffset | ||
| } | ||
| } else lastOffset | ||
| } | ||
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| private def tokenize(text: String): Tokens = { | ||
| val tokenized = text.tokenize.toOption | ||
| tokenized match { | ||
| case None => Tokens(Array.empty) | ||
| case Some(v) => v | ||
| } | ||
| } | ||
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| private def isWhitespace(t: Token): Boolean = | ||
| t.is[Token.Space] || t.is[Token.Tab] || t.is[Token.CR] || | ||
| t.is[Token.LF] || t.is[Token.FF] || t.is[Token.LFLF] | ||
| } |
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