Add initial CompilerCallback implementation for IntelliJ

This adds some simple callbacks to Dotty that should be enough to
get basic integration from IntelliJ.

1 files changed, 15 insertions, 0 deletions

diff --git a/src/dotty/tools/dotc/core/Contexts.scala b/src/dotty/tools/dotc/core/Contexts.scala
index 522240b0f..1a471537e 100644
--- a/src/dotty/tools/dotc/core/Contexts.scala
+++ b/src/dotty/tools/dotc/core/Contexts.scala
@@ -72,11 +72,23 @@ object Contexts {
       def next = { val c = current; current = current.outer; c }
     }
 
+    /** Set the compiler callback, shared by all contexts with the same `base` */
+    def setCompilerCallback(callback: CompilerCallback): this.type = {
+      base.compilerCallback = callback; this
+    }
+
     /** The outer context */
     private[this] var _outer: Context = _
     protected def outer_=(outer: Context) = _outer = outer
     def outer: Context = _outer
 
+    // protected def compilerCallback_=(callback: CompilerCallback) =
+    //   _compilerCallback = callback
+    // def compilerCallback: CompilerCallback = _compilerCallback
+    // def setCompilerCallback(callback: CompilerCallback): this.type = {
+    //   this.compilerCallback = callback; this
+    // }
+
     /** The current context */
     private[this] var _period: Period = _
     protected def period_=(period: Period) = {
@@ -525,6 +537,9 @@ object Contexts {
   /** The essential mutable state of a context base, collected into a common class */
   class ContextState {
 
+    /** The compiler callback implementation, or null if unset */
+    var compilerCallback: CompilerCallback = _
+
     // Symbols state
 
     /** A counter for unique ids */