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/* NSC -- new Scala compiler
* Copyright 2005-2012 LAMP/EPFL
* @author Paul Phillips
*/
package scala.tools.nsc
package interpreter
import CodeHandlers.NoSuccess
import scala.util.control.ControlThrowable
/**
* The start of a simpler interface for utilizing the compiler with piecemeal
* code strings. The "T" here could potentially be a Tree, a Type, a Symbol,
* a Boolean, or something even more exotic.
*/
trait CodeHandlers[T] {
self =>
// Expressions are composed of operators and operands.
def expr(code: String): T
// Statements occur as parts of blocks and templates.
// A statement can be an import, a definition or an expression, or it can be empty.
// Statements used in the template of a class definition can also be declarations.
def stmt(code: String): T
def stmts(code: String): Seq[T]
object opt extends CodeHandlers[Option[T]] {
val handler: PartialFunction[Throwable, Option[T]] = {
case _: NoSuccess => None
}
val handlerSeq: PartialFunction[Throwable, Seq[Option[T]]] = {
case _: NoSuccess => Nil
}
def expr(code: String) = try Some(self.expr(code)) catch handler
def stmt(code: String) = try Some(self.stmt(code)) catch handler
def stmts(code: String) = try (self.stmts(code) map (x => Some(x))) catch handlerSeq
}
}
object CodeHandlers {
def incomplete() = throw CodeIncomplete
def fail(msg: String) = throw new CodeException(msg)
trait NoSuccess extends ControlThrowable
class CodeException(msg: String) extends RuntimeException(msg) with NoSuccess { }
object CodeIncomplete extends CodeException("CodeIncomplete")
}
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