| // 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.rules.python; |
| |
| import com.google.common.collect.ImmutableSet; |
| import com.google.devtools.build.lib.actions.Artifact; |
| import com.google.devtools.build.lib.actions.Root; |
| import com.google.devtools.build.lib.analysis.FilesToRunProvider; |
| import com.google.devtools.build.lib.analysis.RuleConfiguredTarget; |
| import com.google.devtools.build.lib.analysis.RuleContext; |
| import com.google.devtools.build.lib.analysis.Runfiles; |
| import com.google.devtools.build.lib.analysis.actions.SpawnAction; |
| import com.google.devtools.build.lib.util.FileType; |
| import com.google.devtools.build.lib.vfs.PathFragment; |
| |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| |
| /** |
| * Various utility methods for Python support. |
| */ |
| public final class PythonUtils { |
| public static final PathFragment INIT_PY = new PathFragment("__init__.py"); |
| public static final PathFragment INIT_PYC = new PathFragment("__init__.pyc"); |
| |
| private static final FileType REQUIRES_INIT_PY = FileType.of(".py", ".so", ".pyc"); |
| |
| public static final Runfiles.EmptyFilesSupplier GET_INIT_PY_FILES = |
| new Runfiles.EmptyFilesSupplier() { |
| @Override |
| public Iterable<PathFragment> getExtraPaths(Set<PathFragment> manifestPaths) { |
| return getInitPyFiles(manifestPaths); |
| } |
| }; |
| |
| private PythonUtils() { |
| // This is a utility class, not to be instantiated |
| } |
| |
| /** |
| * Returns the set of empty __init__.py(c) files to be added to a given set of files to allow |
| * the Python runtime to find the <code>.py</code> and <code>.so</code> files present in the |
| * tree. |
| */ |
| public static Set<PathFragment> getInitPyFiles(Set<PathFragment> manifestFiles) { |
| Set<PathFragment> result = new HashSet<>(); |
| |
| for (PathFragment source : manifestFiles) { |
| // If we have a python or .so file at this level... |
| if (REQUIRES_INIT_PY.matches(source)) { |
| // ...then record that we need an __init__.py in this directory... |
| while (source.segmentCount() > 1) { |
| source = source.getParentDirectory(); |
| PathFragment initpy = source.getRelative(INIT_PY); |
| PathFragment initpyc = source.getRelative(INIT_PYC); |
| |
| if (!manifestFiles.contains(initpy) && !manifestFiles.contains(initpyc)) { |
| result.add(initpy); |
| } |
| } |
| } |
| } |
| |
| return ImmutableSet.copyOf(result); |
| } |
| |
| /** |
| * Get the artifact generated by the 2to3 action. The artifact is in a python3 |
| * subdirectory to avoid conflicts (eg. when the input file is generated). |
| */ |
| private static Artifact get2to3OutputArtifact(RuleContext ruleContext, Artifact input) { |
| Root root = ruleContext.getConfiguration().getGenfilesDirectory( |
| ruleContext.getRule().getRepository()); |
| PathFragment path = new PathFragment("python3").getRelative(input.getRootRelativePath()); |
| return ruleContext.getShareableArtifact(path, root); |
| } |
| |
| /** |
| * Create an action for each Python 2 file to convert to Python 3 |
| */ |
| public static Map<PathFragment, Artifact> generate2to3Actions(RuleContext ruleContext, |
| Iterable<Artifact> inputs) { |
| // This creates many actions, but this is fine. Creating one action per library leads |
| // to some problems (when the same file is generated by two different actions), with |
| // little benefits and negligible memory improvement. |
| |
| Map<PathFragment, Artifact> symlinks = new HashMap<>(); |
| for (Artifact input : inputs) { |
| Artifact output = generate2to3Action(ruleContext, input); |
| symlinks.put(input.getRootRelativePath(), output); |
| } |
| return symlinks; |
| } |
| |
| private static Artifact generate2to3Action(RuleContext ruleContext, Artifact input) { |
| FilesToRunProvider py2to3converter = |
| ruleContext.getExecutablePrerequisite("$python2to3", RuleConfiguredTarget.Mode.HOST); |
| Artifact output = get2to3OutputArtifact(ruleContext, input); |
| List<String> argv = new ArrayList<>(); |
| argv.add("--no-diffs"); |
| argv.add("--nobackups"); |
| argv.add("--write"); |
| argv.add("--output-dir"); |
| argv.add(output.getExecPath().getParentDirectory().toString()); |
| argv.add("--write-unchanged-files"); |
| argv.add(input.getExecPathString()); |
| |
| ruleContext.registerAction(new SpawnAction.Builder() |
| .addInput(input) |
| .addOutput(output) |
| .setExecutable(py2to3converter) |
| .addArguments(argv) |
| .setProgressMessage("Converting to Python 3: " + input.prettyPrint()) |
| .setMnemonic("2to3") |
| .build(ruleContext)); |
| return output; |
| } |
| } |