blob: 1b8a6ed20c3e4007c5b2fdcbf68f5ff0500f7337 [file] [log] [blame]
// 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.SkylarkCallable;
import com.google.devtools.build.lib.skylarkinterface.SkylarkPrinter;
import java.util.List;
import java.util.Map;
import javax.annotation.Nullable;
/**
* A function-object abstraction on object methods exposed to skylark using {@link SkylarkCallable}.
*/
public class BuiltinCallable implements StarlarkFunction {
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,
Environment env)
throws EvalException, InterruptedException {
MethodDescriptor methodDescriptor =
FuncallExpression.getMethod(env.getSemantics(), obj.getClass(), methodName);
// TODO(cparsons): Profiling should be done at the MethodDescriptor level.
try (SilentCloseable c =
Profiler.instance().profile(ProfilerTask.STARLARK_BUILTIN_FN, methodName)) {
Object[] javaArguments =
ast.convertStarlarkArgumentsToJavaMethodArguments(
methodDescriptor, obj.getClass(), args, kwargs, env);
return methodDescriptor.call(obj, javaArguments, ast.getLocation(), env);
}
}
@Override
public void repr(SkylarkPrinter printer) {
printer.append("<built-in function " + methodName + ">");
}
}