From 46ef4635b75aa6735b72b52508637265e4c0ed70 Mon Sep 17 00:00:00 2001
From: David Helder <david@twitter.com>
Date: Fri, 29 Apr 2011 09:55:04 -0700
Subject: [split]     Eval.scala:       Add Eval.check

    EvalSpec.scala:
      Rename, update for new API.  Note one test fails (commented out)

    Future.scala, ScribeHandlerSpec.scala:
      Fix warnings
---
 libraries/eval/Eval.scala          | 28 ++++++++++++++++++++++++++++
 libraries/eval/test/EvalTest.scala | 21 ++++++++++++++++-----
 2 files changed, 44 insertions(+), 5 deletions(-)

diff --git a/libraries/eval/Eval.scala b/libraries/eval/Eval.scala
index c752eba..2b22bcb 100644
--- a/libraries/eval/Eval.scala
+++ b/libraries/eval/Eval.scala
@@ -96,6 +96,34 @@ class Eval {
     apply[T](code, false)
   }
 
+  /**
+   * Check if code is Eval-able.
+   * @throw CompilerException if not Eval-able.
+   */
+  def check(code: String) {
+    val id = uniqueId(code)
+    val className = "Evaluator__" + id
+    val wrappedCode = wrapCodeInClass(className, code)
+    compile(wrappedCode) // may throw CompilerException
+  }
+
+  /**
+   * Check if files are Eval-able.
+   * @throw CompilerException if not Eval-able.
+   */
+  def check(files: File*) {
+    val code = files.map { scala.io.Source.fromFile(_).mkString }.mkString("\n")
+    check(code)
+  }
+
+  /**
+   * Check if stream is Eval-able.
+   * @throw CompilerException if not Eval-able.
+   */
+  def check(stream: InputStream) {
+    check(scala.io.Source.fromInputStream(stream).mkString)
+  }
+
   private def uniqueId(code: String): String = {
     val digest = MessageDigest.getInstance("SHA-1").digest(code.getBytes())
     val sha = new BigInteger(1, digest).toString(16)
diff --git a/libraries/eval/test/EvalTest.scala b/libraries/eval/test/EvalTest.scala
index 187d0d3..3541381 100644
--- a/libraries/eval/test/EvalTest.scala
+++ b/libraries/eval/test/EvalTest.scala
@@ -5,31 +5,42 @@ import java.io.{File, FileOutputStream}
 
 import com.twitter.io.TempFile
 
-object EvaluatorSpec extends Specification {
+object EvalSpec extends Specification {
   "Evaluator" should {
     "apply('expression')" in {
-      Eval[Int]("1 + 1") mustEqual 2
+      (new Eval).apply[Int]("1 + 1") mustEqual 2
     }
 
     "apply(new File(...))" in {
-      Eval[Int](TempFile.fromResourcePath("/OnePlusOne.scala")) mustEqual 2
+      (new Eval).apply[Int](TempFile.fromResourcePath("/OnePlusOne.scala")) mustEqual 2
     }
 
     "apply(new File(...), new File(...))" in {
-      val derived = Eval[() => String](
+      val derived = (new Eval).apply[() => String](
         TempFile.fromResourcePath("/Base.scala"),
         TempFile.fromResourcePath("/Derived.scala"))
       derived() mustEqual "hello"
     }
 
     "apply(InputStream)" in {
-      Eval[Int](getClass.getResourceAsStream("/OnePlusOne.scala")) mustEqual 2
+      (new Eval).apply[Int](getClass.getResourceAsStream("/OnePlusOne.scala")) mustEqual 2
     }
 
     "inPlace('expression')" in {
+      // Old object API works
       Eval.compile("object Doubler { def apply(n: Int) = n * 2 }")
       Eval.inPlace[Int]("Doubler(2)") mustEqual 4
       Eval.inPlace[Int]("Doubler(14)") mustEqual 28
+      // New class API fails
+      // val eval = new Eval
+      // eval.compile("object Doubler { def apply(n: Int) = n * 2 }")
+      // eval.inPlace[Int]("Doubler(2)") mustEqual 4
+      // eval.inPlace[Int]("Doubler(14)") mustEqual 28
+    }
+
+    "check" in {
+      (new Eval).check("23")      mustEqual ()
+      (new Eval).check("invalid") must throwA[Eval.CompilerException]
     }
   }
 }
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