| // Copyright 2018 The Bazel Authors. All rights reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package com.google.devtools.build.lib.syntax; |
| |
| import com.google.devtools.build.lib.skylarkinterface.SkylarkValue; |
| import java.util.List; |
| import java.util.Map; |
| import javax.annotation.Nullable; |
| |
| /** |
| * The StarlarkCallable interface is implemented by all Starlark values that may be called from |
| * Starlark like a function, including built-in functions and methods, Starlark functions, and |
| * application-defined objects (such as rules, aspects, and providers in Bazel). |
| */ |
| public interface StarlarkCallable extends SkylarkValue { |
| |
| /** |
| * Call this function with the given arguments. |
| * |
| * <p>Neither the callee nor the caller may modify the args List or kwargs Map. |
| * |
| * @param args the list of positional arguments |
| * @param kwargs the mapping of named arguments |
| * @param call the syntax tree of the function call |
| * @param thread the StarlarkThread in which the function is called |
| * @return the result of the call |
| * @throws EvalException if there was an error invoking this function |
| */ |
| // TODO(adonovan): |
| // - rename StarlarkThread to StarlarkThread and make it the first parameter. |
| // - eliminate the FuncallExpression parameter (which can be accessed through thread). |
| public Object call( |
| List<Object> args, |
| @Nullable Map<String, Object> kwargs, |
| @Nullable FuncallExpression call, |
| StarlarkThread thread) |
| throws EvalException, InterruptedException; |
| |
| // TODO(adonovan): add a getName method that defines how this callable appears in a stack trace. |
| } |