Added missing file.

Author: odersky

src/compiler/scala/reflect/runtime/TreeBuildUtil.scala

@@ -0,0 +1,48 @@
+package scala.reflect.runtime
+
+trait TreeBuildUtil extends Universe {
+
+  def staticClass(name: String): Symbol = definitions.getClass(newTypeName(name))
+  def staticModule(name: String): Symbol = definitions.getModule(newTermName(name))
+
+  def thisModuleType(name: String) =
+    definitions.getModule(name).moduleClass.thisType
+
+ /** Selects type symbol with given name from the defined members of prefix type
+   */
+  def selectType(owner: Symbol, name: String): Symbol =
+    owner.info.decl(newTypeName(name))
+
+  /** Selects term symbol with given name and type from the defined members of prefix type
+   *  @pre   The prefix type
+   *  @name  The name of the selected member
+   */
+  def selectTerm(owner: Symbol, name: String): Symbol = {
+    val sym = owner.info.decl(newTermName(name))
+    if (sym.isOverloaded) sym suchThat (!_.isMethod)
+    else sym
+  }
+
+  def selectOverloadedMethod(owner: Symbol, name: String, index: Int): Symbol =
+    owner.info.decl(newTermName(name)).alternatives(index)
+
+  def selectParam(owner: Symbol, idx: Int): Symbol = {
+    def selectInList(params: List[Symbol], idx: Int, fallback: Type): Symbol = {
+      if (params.isEmpty) selectIn(fallback, idx)
+      else if (idx == 0) params.head
+      else selectInList(params.tail, idx - 1, fallback)
+    }
+    def selectIn(tpe: Type, idx: Int): Symbol = tpe match {
+      case PolyType(tparams, res) => selectInList(tparams, idx, res)
+      case MethodType(params, res) => selectInList(params, idx, res)
+      case _ => NoSymbol
+    }
+    selectIn(owner.info, idx)
+  }
+
+
+  def freeVar(name: String, info: Type, value: Any) = new FreeVar(name, info, value)
+
+  def newScopeWith(decls: List[Symbol]) = new Scope(decls)
+
+}