1 files changed, 61 insertions, 0 deletions
diff --git a/javalanglib/src/main/scala/java/lang/Boolean.scala b/javalanglib/src/main/scala/java/lang/Boolean.scala
new file mode 100644
index 0000000..94a9967
--- /dev/null
+++ b/javalanglib/src/main/scala/java/lang/Boolean.scala
@@ -0,0 +1,61 @@
+package java.lang
+
+import scala.scalajs.js
+
+/* This is a hijacked class. Its instances are primitive booleans.
+ * Constructors are not emitted.
+ */
+final class Boolean private () extends Comparable[Boolean] {
+
+  def this(value: scala.Boolean) = this()
+  def this(v: String) = this()
+
+  @inline def booleanValue(): scala.Boolean =
+    this.asInstanceOf[scala.Boolean]
+
+  @inline override def equals(that: Any): scala.Boolean =
+    this eq that.asInstanceOf[AnyRef]
+
+  @inline override def hashCode(): Int =
+    if (booleanValue) 1231 else 1237
+
+  @inline override def compareTo(that: Boolean): Int =
+    Boolean.compare(booleanValue, that.booleanValue)
+
+  @inline override def toString(): String =
+    Boolean.toString(booleanValue)
+
+}
+
+object Boolean {
+  final val TYPE = classOf[scala.Boolean]
+
+  /* TRUE and FALSE are supposed to be vals. However, they are better
+   * optimized as defs, because they end up being just the constant true and
+   * false (since `new Boolean(x)` is a no-op).
+   * Since vals and defs are binary-compatible (although they're not strictly
+   * speaking source-compatible, because of stability), we implement them as
+   * defs. Source-compatibility is not an issue because user code is compiled
+   * against the JDK .class files anyway.
+   * Moreover, preserving the identity of TRUE and FALSE is not an issue
+   * either, since they are primitive booleans in the end.
+   */
+  def TRUE: Boolean = new Boolean(true)
+  def FALSE: Boolean = new Boolean(false)
+
+  @inline def valueOf(booleanValue: scala.Boolean): Boolean = {
+    // We don't care about identity, since they end up as primitive booleans
+    new Boolean(booleanValue)
+  }
+
+  @inline def valueOf(s: String): Boolean = valueOf(parseBoolean(s))
+
+  @inline def parseBoolean(s: String): scala.Boolean =
+    (s != null) && s.equalsIgnoreCase("true")
+
+  @inline def toString(b: scala.Boolean): String =
+    "" + b
+
+  @inline def compare(x: scala.Boolean, y: scala.Boolean): scala.Int =
+    if (x == y) 0 else if (x) 1 else -1
+}