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// 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.analysis.skylark;
import com.google.devtools.build.lib.analysis.AnalysisEnvironment;
import com.google.devtools.build.lib.analysis.EventHandlingErrorReporter;
import com.google.devtools.build.lib.analysis.actions.ActionConstructionContext;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.events.Location;
import com.google.devtools.build.lib.packages.RuleClass.ConfiguredTargetFactory.RuleErrorException;
import com.google.devtools.build.lib.packages.RuleErrorConsumer;
import com.google.devtools.build.lib.skylarkinterface.SkylarkCallable;
import com.google.devtools.build.lib.syntax.Environment;
import com.google.devtools.build.lib.syntax.EvalException;
/**
* {@link RuleErrorConsumer} for Native implementations of Skylark APIs.
*
* <p>This class largely reproduces the functionality of the error consumer in {@link
* com.google.devtools.build.lib.analysis.RuleContext}, but should be easy to create and use from
* methods annotated with {@link com.google.devtools.build.lib.skylarkinterface.SkylarkCallable}.
* (Environment and Location are automatically provided to those methods be specifying the {@link
* SkylarkCallable#useLocation()} and {@link SkylarkCallable#useEnvironment()} fields in the
* annotation.
*
* <p>This class is AutoClosable, to ensure that {@link RuleErrorException} are checked and handled
* before leaving native code. The {@link #close()} method will only throw {@link EvalException},
* properly wrapping any {@link RuleErrorException} instances if needed.
*/
public class SkylarkErrorReporter extends EventHandlingErrorReporter implements AutoCloseable {
private final Location location;
private final Label label;
public static SkylarkErrorReporter from(
ActionConstructionContext context, Location location, Environment env) {
return new SkylarkErrorReporter(
context.getActionOwner().getTargetKind(),
context.getAnalysisEnvironment(),
location,
env.getCallerLabel());
}
private SkylarkErrorReporter(
String ruleClassNameForLogging,
AnalysisEnvironment analysisEnvironment,
Location location,
Label label) {
super(ruleClassNameForLogging, analysisEnvironment);
this.label = label;
this.location = location;
}
@Override
protected String getMacroMessageAppendix(String attrName) {
return "";
}
@Override
protected Label getLabel() {
return label;
}
@Override
protected Location getRuleLocation() {
return location;
}
@Override
protected Location getAttributeLocation(String attrName) {
return location;
}
@Override
public void close() throws EvalException {
try {
assertNoErrors();
} catch (RuleErrorException e) {
throw new EvalException(location, e);
}
}
}
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