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// Copyright 2014 Google Inc. 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.rules;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.devtools.build.lib.events.EventHandler;
import com.google.devtools.build.lib.packages.SkylarkNativeModule;
import com.google.devtools.build.lib.syntax.BaseFunction;
import com.google.devtools.build.lib.syntax.Environment;
import com.google.devtools.build.lib.syntax.EvaluationContext;
import com.google.devtools.build.lib.syntax.MethodLibrary;
import com.google.devtools.build.lib.syntax.SkylarkEnvironment;
import com.google.devtools.build.lib.syntax.SkylarkModule;
import com.google.devtools.build.lib.syntax.SkylarkSignature;
import com.google.devtools.build.lib.syntax.ValidationEnvironment;
import java.lang.reflect.Field;
import java.util.Map;
/**
* A class to handle all Skylark modules, to create and setup Validation and regular Environments.
*/
// TODO(bazel-team): move that to the syntax package and
// let each extension register itself in a static { } statement.
public class SkylarkModules {
/**
* The list of built in Skylark modules.
* Documentation is generated automatically for all these modules.
* They are also registered with the {@link ValidationEnvironment}
* and the {@link SkylarkEnvironment}.
* Note that only functions with a {@link SkylarkSignature} annotations are handled properly.
*/
// TODO(bazel-team): find a more general, more automated way of registering classes and building
// initial environments. And don't give syntax.Environment and packages.MethodLibrary a special
// treatment, have them use the same registration mechanism as other classes currently below.
public static final ImmutableList<Class<?>> MODULES = ImmutableList.of(
SkylarkAttr.class,
SkylarkCommandLine.class,
SkylarkNativeModule.class,
SkylarkRuleClassFunctions.class,
SkylarkRuleImplementationFunctions.class);
private static final ImmutableMap<Class<?>, ImmutableList<BaseFunction>> FUNCTION_MAP;
private static final ImmutableMap<String, Object> OBJECTS;
static {
try {
ImmutableMap.Builder<Class<?>, ImmutableList<BaseFunction>> functionMap =
ImmutableMap.builder();
ImmutableMap.Builder<String, Object> objects = ImmutableMap.builder();
for (Class<?> moduleClass : MODULES) {
if (moduleClass.isAnnotationPresent(SkylarkModule.class)) {
objects.put(moduleClass.getAnnotation(SkylarkModule.class).name(),
moduleClass.newInstance());
}
ImmutableList.Builder<BaseFunction> functions = ImmutableList.builder();
collectSkylarkFunctionsAndObjectsFromFields(moduleClass, functions, objects);
functionMap.put(moduleClass, functions.build());
}
FUNCTION_MAP = functionMap.build();
OBJECTS = objects.build();
} catch (InstantiationException | IllegalAccessException e) {
throw new RuntimeException(e);
}
}
/**
* Returns a new SkylarkEnvironment with the elements of the Skylark modules.
*/
public static SkylarkEnvironment getNewEnvironment(
EventHandler eventHandler, String astFileContentHashCode) {
SkylarkEnvironment env = new SkylarkEnvironment(eventHandler, astFileContentHashCode);
setupEnvironment(env);
return env;
}
@VisibleForTesting
public static SkylarkEnvironment getNewEnvironment(EventHandler eventHandler) {
return getNewEnvironment(eventHandler, null);
}
private static void setupEnvironment(Environment env) {
MethodLibrary.setupMethodEnvironment(env);
for (Map.Entry<Class<?>, ImmutableList<BaseFunction>> entry : FUNCTION_MAP.entrySet()) {
for (BaseFunction function : entry.getValue()) {
if (function.getObjectType() != null) {
env.registerFunction(function.getObjectType(), function.getName(), function);
} else {
env.update(function.getName(), function);
}
}
}
for (Map.Entry<String, Object> entry : OBJECTS.entrySet()) {
env.update(entry.getKey(), entry.getValue());
}
// Even though PACKAGE_NAME has no value _now_ and will be bound later,
// it needs to be visible for the ValidationEnvironment to be happy.
env.update(Environment.PKG_NAME, Environment.NONE);
}
/**
* Returns a new ValidationEnvironment with the elements of the Skylark modules.
*/
public static ValidationEnvironment getValidationEnvironment() {
// TODO(bazel-team): refactor constructors so we don't have those null-s
return new ValidationEnvironment(getNewEnvironment(null));
}
public static EvaluationContext newEvaluationContext(EventHandler eventHandler) {
return EvaluationContext.newSkylarkContext(
getNewEnvironment(eventHandler), getValidationEnvironment());
}
/**
* Collects the BaseFunctions from the fields of the class of the object parameter
* and adds them into the builder.
*/
private static void collectSkylarkFunctionsAndObjectsFromFields(Class<?> type,
ImmutableList.Builder<BaseFunction> functions, ImmutableMap.Builder<String, Object> objects) {
try {
for (Field field : type.getDeclaredFields()) {
if (field.isAnnotationPresent(SkylarkSignature.class)) {
// Fields in Skylark modules are sometimes private.
// Nevertheless they have to be annotated with SkylarkSignature.
field.setAccessible(true);
SkylarkSignature annotation = field.getAnnotation(SkylarkSignature.class);
Object value = field.get(null);
if (BaseFunction.class.isAssignableFrom(field.getType())) {
functions.add((BaseFunction) value);
} else {
objects.put(annotation.name(), value);
}
}
}
} catch (IllegalArgumentException | IllegalAccessException e) {
// This should never happen.
throw new RuntimeException(e);
}
}
}
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