| // Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| /** |
| * Convert top-level or static functions to objects that can be sent to |
| * other isolates. |
| * |
| * This package is only needed until such functions can be sent directly |
| * through send-ports. |
| */ |
| library pkg.isolate.functionref; |
| |
| import "dart:mirrors"; |
| |
| abstract class FunctionRef { |
| static FunctionRef from(Function function) { |
| var cm = reflect(function); |
| if (cm is ClosureMirror) { |
| MethodMirror fm = cm.function; |
| if (fm.isRegularMethod && fm.isStatic) { |
| Symbol functionName = fm.simpleName; |
| Symbol className; |
| DeclarationMirror owner = fm.owner; |
| if (owner is ClassMirror) { |
| className = owner.simpleName; |
| owner = owner.owner; |
| } |
| if (owner is LibraryMirror) { |
| LibraryMirror ownerLibrary = owner; |
| Uri libraryUri = ownerLibrary.uri; |
| return new _FunctionRef(libraryUri, className, functionName); |
| } |
| } |
| throw new ArgumentError.value(function, "function", |
| "Not a static or top-level function"); |
| } |
| // It's a Function but not a closure, so it's a callable object. |
| return new _CallableObjectRef(function); |
| } |
| |
| Function get function; |
| } |
| |
| class _FunctionRef implements FunctionRef { |
| final Uri libraryUri; |
| final Symbol className; |
| final Symbol functionName; |
| |
| _FunctionRef(this.libraryUri, this.className, this.functionName); |
| |
| Function get function { |
| LibraryMirror lm = currentMirrorSystem().libraries[libraryUri]; |
| if (lm != null) { |
| ObjectMirror owner = lm; |
| if (className != null) { |
| ClassMirror cm = lm.declarations[className]; |
| owner = cm; |
| } |
| if (owner != null) { |
| ClosureMirror function = owner.getField(this.functionName); |
| if (function != null) return function.reflectee; |
| } |
| } |
| String functionName = MirrorSystem.getName(this.functionName); |
| String classQualifier = ""; |
| if (this.className != null) { |
| classQualifier = " in class ${MirrorSystem.getName(this.className)}"; |
| } |
| throw new UnsupportedError( |
| "Function $functionName${classQualifier} not found in library $libraryUri" |
| ); |
| } |
| } |
| |
| class _CallableObjectRef implements FunctionRef { |
| final Function object; |
| _CallableObjectRef(this.object); |
| Function get function => object; |
| } |