| // 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.profiler.Profiler; |
| import com.google.devtools.build.lib.profiler.ProfilerTask; |
| import com.google.devtools.build.lib.profiler.SilentCloseable; |
| import com.google.devtools.build.lib.skylarkinterface.SkylarkPrinter; |
| import java.util.List; |
| import java.util.Map; |
| import javax.annotation.Nullable; |
| |
| /** |
| * A BuiltinCallable is a callable Starlark value that reflectively invokes a method of a Java |
| * object. |
| */ |
| // TODO(adonovan): make this private. Most users would be content with StarlarkCallable; the rest |
| // need only a means of querying the function's parameters. |
| public final class BuiltinCallable implements StarlarkCallable { |
| |
| private final Object obj; |
| private final String methodName; |
| |
| public BuiltinCallable(Object obj, String methodName) { |
| this.obj = obj; |
| this.methodName = methodName; |
| } |
| |
| @Override |
| public Object call( |
| List<Object> args, |
| @Nullable Map<String, Object> kwargs, |
| FuncallExpression ast, |
| StarlarkThread thread) |
| throws EvalException, InterruptedException { |
| MethodDescriptor methodDescriptor = getMethodDescriptor(thread.getSemantics()); |
| Class<?> clazz; |
| Object objValue; |
| |
| if (obj instanceof String) { |
| args.add(0, obj); |
| clazz = StringModule.class; |
| objValue = StringModule.INSTANCE; |
| } else { |
| clazz = obj.getClass(); |
| objValue = obj; |
| } |
| |
| // TODO(cparsons): Profiling should be done at the MethodDescriptor level. |
| try (SilentCloseable c = |
| Profiler.instance().profile(ProfilerTask.STARLARK_BUILTIN_FN, methodName)) { |
| Object[] javaArguments = |
| CallUtils.convertStarlarkArgumentsToJavaMethodArguments( |
| thread, ast, methodDescriptor, clazz, args, kwargs); |
| return methodDescriptor.call(objValue, javaArguments, ast.getLocation(), thread); |
| } |
| } |
| |
| public MethodDescriptor getMethodDescriptor(StarlarkSemantics semantics) { |
| return CallUtils.getMethod(semantics, obj.getClass(), methodName); |
| } |
| |
| @Override |
| public void repr(SkylarkPrinter printer) { |
| printer.append("<built-in function " + methodName + ">"); |
| } |
| } |