Initial commit

1 files changed, 47 insertions, 0 deletions

diff --git a/src/dotty/tools/dotc/core/Contexts.scala b/src/dotty/tools/dotc/core/Contexts.scala
new file mode 100644
index 000000000..b13594f0b
--- /dev/null
+++ b/src/dotty/tools/dotc/core/Contexts.scala
@@ -0,0 +1,47 @@
+package dotty.tools.dotc
+package core
+
+import Decorators._
+import Periods._
+import Names._
+import Phases._
+import Types._
+
+object Contexts {
+
+  val NoContext: Context = null
+
+  abstract class Context extends Periods {
+    val underlying: Context
+    val root: RootContext
+    val period: Period
+    def names: NameTable
+    def phase: Phase = ???
+
+  }
+
+  abstract class SubContext(val underlying: Context) extends Context {
+    val root: RootContext = underlying.root
+    val period: Period = underlying.period
+    def names: NameTable = root.names
+  }
+
+  class RootContext extends Context
+                       with Symbols
+                       with Denotations
+                       with DenotationTransformers
+                       with Types {
+
+    val underlying: Context = throw new UnsupportedOperationException("RootContext.underlying")
+
+    val root: RootContext = this
+    val period = periodOf(NoRunId, NoPhaseId)
+    val names: NameTable = new NameTable
+    val variance = 1
+
+    var lastPhaseId: Int = NoPhaseId
+
+  }
+
+  private final val initialUniquesCapacity = 4096
+}
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