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// Copyright 2017 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;
import com.google.common.base.Supplier;
import com.google.common.base.Suppliers;
import com.google.common.collect.ImmutableCollection;
import com.google.common.collect.ImmutableMap;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.analysis.LocationExpander.LocationFunction;
import com.google.devtools.build.lib.analysis.stringtemplate.ExpansionException;
import com.google.devtools.build.lib.analysis.stringtemplate.TemplateContext;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.cmdline.RepositoryName;
import java.util.Collection;
import java.util.Map;
import javax.annotation.Nullable;
/**
* Expands $(location) and $(locations) tags inside target attributes. You can specify something
* like this in the BUILD file:
*
* <pre>
* somerule(name='some name',
* someopt = [ '$(location //mypackage:myhelper)' ],
* ...)
* </pre>
*
* and location will be substituted with //mypackage:myhelper executable output.
*
* <p>Note that this expander will always expand labels in srcs, deps, and tools attributes, with
* data being optional.
*
* <p>DO NOT USE DIRECTLY! Use RuleContext.getExpander() instead.
*/
final class LocationTemplateContext implements TemplateContext {
private final TemplateContext delegate;
private final ImmutableMap<String, LocationFunction> functions;
private final ImmutableMap<RepositoryName, RepositoryName> repositoryMapping;
private LocationTemplateContext(
TemplateContext delegate,
Label root,
Supplier<Map<Label, Collection<Artifact>>> locationMap,
boolean execPaths,
ImmutableMap<RepositoryName, RepositoryName> repositoryMapping) {
this.delegate = delegate;
this.functions = LocationExpander.allLocationFunctions(root, locationMap, execPaths);
this.repositoryMapping = repositoryMapping;
}
public LocationTemplateContext(
TemplateContext delegate,
RuleContext ruleContext,
@Nullable ImmutableMap<Label, ImmutableCollection<Artifact>> labelMap,
boolean execPaths,
boolean allowData) {
this(
delegate,
ruleContext.getLabel(),
// Use a memoizing supplier to avoid eagerly building the location map.
Suppliers.memoize(
() -> LocationExpander.buildLocationMap(ruleContext, labelMap, allowData)),
execPaths,
ruleContext.getRule().getPackage().getRepositoryMapping());
}
@Override
public String lookupVariable(String name) throws ExpansionException {
return delegate.lookupVariable(name);
}
@Override
public String lookupFunction(String name, String param) throws ExpansionException {
try {
LocationFunction f = functions.get(name);
if (f != null) {
return f.apply(param, repositoryMapping);
}
} catch (IllegalStateException e) {
throw new ExpansionException(e.getMessage(), e);
}
return delegate.lookupFunction(name, param);
}
}
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