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Improve asExprOf cast error formatting #19195

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20 changes: 20 additions & 0 deletions compiler/src/scala/quoted/runtime/impl/ExprCastException.scala
Original file line number Diff line number Diff line change
@@ -0,0 +1,20 @@
package scala.quoted.runtime.impl

import dotty.tools.dotc.ast.tpd.Tree
import dotty.tools.dotc.core.Contexts.*

class ExprCastException(msg: String) extends Exception(msg)


object ExprCastException:
def apply(expectedType: String, actualType: String, exprCode: String): ExprCastException =
new ExprCastException(
s"""|
| Expected type: ${formatLines(expectedType)}
| Actual type: ${formatLines(actualType)}
| Expression: ${formatLines(exprCode)}
|""".stripMargin)

private def formatLines(str: String): String =
if !str.contains("\n") then str
else str.linesIterator.mkString("\n ", "\n ", "\n")
10 changes: 5 additions & 5 deletions compiler/src/scala/quoted/runtime/impl/QuotesImpl.scala
Original file line number Diff line number Diff line change
Expand Up @@ -23,6 +23,7 @@ import scala.quoted.runtime.{QuoteUnpickler, QuoteMatching}
import scala.quoted.runtime.impl.printers.*

import scala.reflect.TypeTest
import dotty.tools.dotc.core.NameKinds.ExceptionBinderName

object QuotesImpl {

Expand Down Expand Up @@ -70,11 +71,10 @@ class QuotesImpl private (using val ctx: Context) extends Quotes, QuoteUnpickler
if self.isExprOf[X] then
self.asInstanceOf[scala.quoted.Expr[X]]
else
throw Exception(
s"""Expr cast exception: ${self.show}
|of type: ${reflect.Printer.TypeReprCode.show(reflect.asTerm(self).tpe)}
|did not conform to type: ${reflect.Printer.TypeReprCode.show(reflect.TypeRepr.of[X])}
|""".stripMargin
throw ExprCastException(
expectedType = reflect.Printer.TypeReprCode.show(reflect.TypeRepr.of[X]),
actualType = reflect.Printer.TypeReprCode.show(reflect.asTerm(self).tpe),
exprCode = self.show
)
}
end extension
Expand Down
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