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// Copyright 2014 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.skyframe;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.devtools.build.lib.analysis.Aspect;
import com.google.devtools.build.lib.analysis.ConfiguredAspectFactory;
import com.google.devtools.build.lib.analysis.ConfiguredTarget;
import com.google.devtools.build.lib.analysis.RuleContext;
import com.google.devtools.build.lib.events.Location;
import com.google.devtools.build.lib.packages.AspectDefinition;
import com.google.devtools.build.lib.packages.AspectParameters;
import com.google.devtools.build.lib.rules.SkylarkRuleClassFunctions.SkylarkAspect;
import com.google.devtools.build.lib.rules.SkylarkRuleContext;
import com.google.devtools.build.lib.syntax.ClassObject.SkylarkClassObject;
import com.google.devtools.build.lib.syntax.Environment;
import com.google.devtools.build.lib.syntax.EvalException;
import com.google.devtools.build.lib.syntax.Mutability;
/**
* A factory for aspects that are defined in Skylark.
*/
public class SkylarkAspectFactory implements ConfiguredAspectFactory {
private final String name;
private final SkylarkAspect aspectFunction;
public SkylarkAspectFactory(String name, SkylarkAspect aspectFunction) {
this.name = name;
this.aspectFunction = aspectFunction;
}
@Override
public Aspect create(ConfiguredTarget base, RuleContext ruleContext, AspectParameters parameters)
throws InterruptedException {
try (Mutability mutability = Mutability.create("aspect")) {
SkylarkRuleContext skylarkRuleContext;
try {
skylarkRuleContext = new SkylarkRuleContext(ruleContext);
} catch (EvalException e) {
ruleContext.ruleError(e.getMessage());
return null;
}
Environment env =
Environment.builder(mutability)
.setSkylark()
.setGlobals(aspectFunction.getFuncallEnv().getGlobals())
.setEventHandler(ruleContext.getAnalysisEnvironment().getEventHandler())
.build(); // NB: loading phase functions are not available: this is analysis already,
// so we do *not* setLoadingPhase().
Object aspect;
try {
aspect =
aspectFunction
.getImplementation()
.call(
ImmutableList.<Object>of(base, skylarkRuleContext),
ImmutableMap.<String, Object>of(),
/*ast=*/ null,
env);
} catch (EvalException e) {
ruleContext.ruleError(e.getMessage());
return null;
}
// todo(dslomov): unify this code with
// {@link com.google.devtools.build.lib.rules.SkylarkRuleConfiguredTargetBuilder}
Aspect.Builder builder = new Aspect.Builder(name);
if (aspect instanceof SkylarkClassObject) {
SkylarkClassObject struct = (SkylarkClassObject) aspect;
Location loc = struct.getCreationLoc();
for (String key : struct.getKeys()) {
builder.addSkylarkTransitiveInfo(key, struct.getValue(key), loc);
}
}
return builder.build();
}
}
@Override
public AspectDefinition getDefinition() {
return new AspectDefinition.Builder(name).build();
}
}
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