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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.collect.CollectionUtils;
import com.google.devtools.build.lib.events.EventHandler;
import com.google.devtools.build.lib.packages.MethodLibrary;
import com.google.devtools.build.lib.syntax.Environment;
import com.google.devtools.build.lib.syntax.Function;
import com.google.devtools.build.lib.syntax.SkylarkBuiltin;
import com.google.devtools.build.lib.syntax.SkylarkEnvironment;
import com.google.devtools.build.lib.syntax.SkylarkFunction;
import com.google.devtools.build.lib.syntax.SkylarkModule;
import com.google.devtools.build.lib.syntax.SkylarkType;
import com.google.devtools.build.lib.syntax.SkylarkType.SkylarkFunctionType;
import com.google.devtools.build.lib.syntax.ValidationEnvironment;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;
/**
* A class to handle all Skylark modules, to create and setup Validation and regular Environments.
*/
public class SkylarkModules {
public static final ImmutableList<Class<?>> MODULES = ImmutableList.of(
SkylarkAttr.class,
SkylarkCommandLine.class,
SkylarkRuleClassFunctions.class,
SkylarkRuleImplementationFunctions.class);
private static final ImmutableMap<Class<?>, ImmutableList<Function>> FUNCTION_MAP;
private static final ImmutableMap<String, Object> OBJECTS;
static {
try {
ImmutableMap.Builder<Class<?>, ImmutableList<Function>> 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<Function> 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<Function>> entry : FUNCTION_MAP.entrySet()) {
for (Function 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());
}
}
/**
* Returns a new ValidationEnvironment with the elements of the Skylark modules.
*/
public static ValidationEnvironment getValidationEnvironment() {
return getValidationEnvironment(ImmutableMap.<String, SkylarkType>of());
}
/**
* Returns a new ValidationEnvironment with the elements of the Skylark modules and extraObjects.
*/
public static ValidationEnvironment getValidationEnvironment(
ImmutableMap<String, SkylarkType> extraObjects) {
Map<SkylarkType, Map<String, SkylarkType>> builtIn = new HashMap<>();
Map<String, SkylarkType> global = new HashMap<>();
builtIn.put(SkylarkType.GLOBAL, global);
collectSkylarkTypesFromFields(Environment.class, builtIn);
for (Class<?> moduleClass : MODULES) {
if (moduleClass.isAnnotationPresent(SkylarkModule.class)) {
global.put(moduleClass.getAnnotation(SkylarkModule.class).name(),
SkylarkType.of(moduleClass));
}
}
global.put("native", SkylarkType.UNKNOWN);
MethodLibrary.setupValidationEnvironment(builtIn);
for (Class<?> module : MODULES) {
collectSkylarkTypesFromFields(module, builtIn);
}
global.putAll(extraObjects);
return new ValidationEnvironment(CollectionUtils.toImmutable(builtIn));
}
/**
* Collects the SkylarkFunctions from the fields of the class of the object parameter
* and adds them into the builder.
*/
private static void collectSkylarkFunctionsAndObjectsFromFields(Class<?> type,
ImmutableList.Builder<Function> functions, ImmutableMap.Builder<String, Object> objects) {
try {
for (Field field : type.getDeclaredFields()) {
if (field.isAnnotationPresent(SkylarkBuiltin.class)) {
// Fields in Skylark modules are sometimes private. Nevertheless they have to
// be annotated with SkylarkBuiltin.
field.setAccessible(true);
SkylarkBuiltin annotation = field.getAnnotation(SkylarkBuiltin.class);
if (SkylarkFunction.class.isAssignableFrom(field.getType())) {
SkylarkFunction function = (SkylarkFunction) field.get(null);
if (!function.isConfigured()) {
function.configure(annotation);
}
functions.add(function);
} else {
objects.put(annotation.name(), field.get(null));
}
}
}
} catch (IllegalArgumentException | IllegalAccessException e) {
// This should never happen.
throw new RuntimeException(e);
}
}
/**
* Collects the SkylarkFunctions from the fields of the class of the object parameter
* and adds their class and their corresponding return value to the builder.
*/
private static void collectSkylarkTypesFromFields(Class<?> classObject,
Map<SkylarkType, Map<String, SkylarkType>> builtIn) {
for (Field field : classObject.getDeclaredFields()) {
if (field.isAnnotationPresent(SkylarkBuiltin.class)) {
SkylarkBuiltin annotation = field.getAnnotation(SkylarkBuiltin.class);
if (SkylarkFunction.class.isAssignableFrom(field.getType())) {
try {
// TODO(bazel-team): infer the correct types.
SkylarkType objectType = annotation.objectType().equals(Object.class)
? SkylarkType.GLOBAL
: SkylarkType.of(annotation.objectType());
if (!builtIn.containsKey(objectType)) {
builtIn.put(objectType, new HashMap<String, SkylarkType>());
}
// TODO(bazel-team): add parameters to SkylarkFunctionType
SkylarkType returnType = SkylarkType.getReturnType(annotation);
builtIn.get(objectType).put(annotation.name(),
SkylarkFunctionType.of(annotation.name(), returnType));
} catch (IllegalArgumentException e) {
// This should never happen.
throw new RuntimeException(e);
}
} else if (Function.class.isAssignableFrom(field.getType())) {
builtIn.get(SkylarkType.GLOBAL).put(annotation.name(),
SkylarkFunctionType.of(annotation.name(), SkylarkType.UNKNOWN));
} else {
builtIn.get(SkylarkType.GLOBAL).put(annotation.name(), SkylarkType.of(field.getType()));
}
}
}
}
}
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