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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.bazel.rules.python;
import com.google.common.base.Joiner;
import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.analysis.RuleContext;
import com.google.devtools.build.lib.analysis.Runfiles.Builder;
import com.google.devtools.build.lib.analysis.RunfilesSupport;
import com.google.devtools.build.lib.analysis.actions.TemplateExpansionAction;
import com.google.devtools.build.lib.analysis.actions.TemplateExpansionAction.Substitution;
import com.google.devtools.build.lib.analysis.actions.TemplateExpansionAction.Template;
import com.google.devtools.build.lib.collect.nestedset.NestedSet;
import com.google.devtools.build.lib.rules.cpp.CcLinkParamsStore;
import com.google.devtools.build.lib.rules.python.PyCommon;
import com.google.devtools.build.lib.rules.python.PythonSemantics;
import com.google.devtools.build.lib.rules.test.InstrumentedFilesCollector.InstrumentationSpec;
import com.google.devtools.build.lib.syntax.Type;
import com.google.devtools.build.lib.util.FileTypeSet;
import com.google.devtools.build.lib.vfs.PathFragment;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
/**
* Functionality specific to the Python rules in Bazel.
*/
public class BazelPythonSemantics implements PythonSemantics {
private static final Template STUB_TEMPLATE =
Template.forResource(BazelPythonSemantics.class, "stub_template.txt");
public static final InstrumentationSpec PYTHON_COLLECTION_SPEC = new InstrumentationSpec(
FileTypeSet.of(BazelPyRuleClasses.PYTHON_SOURCE),
"srcs", "deps", "data");
@Override
public void validate(RuleContext ruleContext, PyCommon common) {
}
@Override
public void collectRunfilesForBinary(RuleContext ruleContext, Builder builder, PyCommon common) {
}
@Override
public void collectDefaultRunfilesForBinary(RuleContext ruleContext, Builder builder) {
}
@Override
public InstrumentationSpec getCoverageInstrumentationSpec() {
return PYTHON_COLLECTION_SPEC;
}
@Override
public Collection<Artifact> precompiledPythonFiles(
RuleContext ruleContext, Collection<Artifact> sources, PyCommon common) {
return ImmutableList.copyOf(sources);
}
@Override
public List<PathFragment> getImports(RuleContext ruleContext) {
List<PathFragment> result = new ArrayList<>();
PathFragment packageFragment = ruleContext.getLabel().getPackageIdentifier().getPathFragment();
for (String importsAttr : ruleContext.attributes().get("imports", Type.STRING_LIST)) {
importsAttr = ruleContext.expandMakeVariables("includes", importsAttr);
if (importsAttr.startsWith("/")) {
ruleContext.attributeWarning("imports",
"ignoring invalid absolute path '" + importsAttr + "'");
continue;
}
PathFragment importsPath = packageFragment.getRelative(importsAttr).normalize();
if (!importsPath.isNormalized()) {
ruleContext.attributeError("imports",
"Path references a path above the execution root.");
}
result.add(importsPath);
}
return result;
}
@Override
public void createExecutable(RuleContext ruleContext, PyCommon common,
CcLinkParamsStore ccLinkParamsStore, NestedSet<PathFragment> imports) {
String main = common.determineMainExecutableSource();
BazelPythonConfiguration config = ruleContext.getFragment(BazelPythonConfiguration.class);
String pythonBinary;
switch (common.getVersion()) {
case PY2: pythonBinary = config.getPython2Path(); break;
case PY3: pythonBinary = config.getPython3Path(); break;
default: throw new IllegalStateException();
}
ruleContext.registerAction(new TemplateExpansionAction(
ruleContext.getActionOwner(),
common.getExecutable(),
STUB_TEMPLATE,
ImmutableList.of(
Substitution.of("%main%", main),
Substitution.of("%python_binary%", pythonBinary),
Substitution.of("%imports%", Joiner.on(":").join(imports))),
true));
}
@Override
public void postInitBinary(RuleContext ruleContext, RunfilesSupport runfilesSupport,
PyCommon common) {
}
}
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