| // Copyright 2016 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.devtools.build.lib.cmdline.Label; |
| import com.google.devtools.build.lib.packages.BuildFileContainsErrorsException; |
| import com.google.devtools.build.lib.packages.RuleClassProvider; |
| import com.google.devtools.build.lib.syntax.BuildFileAST; |
| import com.google.devtools.build.lib.syntax.LoadStatement; |
| import com.google.devtools.build.lib.syntax.ParserInputSource; |
| import com.google.devtools.build.lib.syntax.Statement; |
| import com.google.devtools.build.lib.vfs.FileSystemUtils; |
| import com.google.devtools.build.lib.vfs.Path; |
| import com.google.devtools.build.lib.vfs.PathFragment; |
| import com.google.devtools.build.lib.vfs.RootedPath; |
| import com.google.devtools.build.skyframe.SkyFunction; |
| import com.google.devtools.build.skyframe.SkyFunctionException; |
| import com.google.devtools.build.skyframe.SkyFunctionException.Transience; |
| import com.google.devtools.build.skyframe.SkyKey; |
| import com.google.devtools.build.skyframe.SkyValue; |
| import java.io.IOException; |
| import java.util.List; |
| |
| /** |
| * A SkyFunction to parse WORKSPACE files into a BuildFileAST. |
| */ |
| public class WorkspaceASTFunction implements SkyFunction { |
| private final RuleClassProvider ruleClassProvider; |
| |
| public WorkspaceASTFunction(RuleClassProvider ruleClassProvider) { |
| this.ruleClassProvider = ruleClassProvider; |
| } |
| |
| @Override |
| public SkyValue compute(SkyKey skyKey, Environment env) |
| throws InterruptedException, WorkspaceASTFunctionException { |
| RootedPath workspaceRoot = (RootedPath) skyKey.argument(); |
| FileValue workspaceFileValue = (FileValue) env.getValue(FileValue.key(workspaceRoot)); |
| if (workspaceFileValue == null) { |
| return null; |
| } |
| |
| Path repoWorkspace = workspaceRoot.getRoot().getRelative(workspaceRoot.getRootRelativePath()); |
| try { |
| BuildFileAST ast = BuildFileAST.parseBuildFile( |
| ParserInputSource.create(ruleClassProvider.getDefaultWorkspacePrefix(), |
| PathFragment.create("/DEFAULT.WORKSPACE")), |
| env.getListener()); |
| if (ast.containsErrors()) { |
| throw new WorkspaceASTFunctionException( |
| new BuildFileContainsErrorsException( |
| Label.EXTERNAL_PACKAGE_IDENTIFIER, "Failed to parse default WORKSPACE file"), |
| Transience.PERSISTENT); |
| } |
| if (workspaceFileValue.exists()) { |
| byte[] bytes = |
| FileSystemUtils.readWithKnownFileSize(repoWorkspace, repoWorkspace.getFileSize()); |
| ast = |
| BuildFileAST.parseBuildFile( |
| ParserInputSource.create(bytes, repoWorkspace.asFragment()), |
| ast.getStatements(), |
| env.getListener()); |
| if (ast.containsErrors()) { |
| throw new WorkspaceASTFunctionException( |
| new BuildFileContainsErrorsException( |
| Label.EXTERNAL_PACKAGE_IDENTIFIER, "Failed to parse WORKSPACE file"), |
| Transience.PERSISTENT); |
| } |
| } |
| ast = BuildFileAST.parseBuildFile( |
| ParserInputSource.create(ruleClassProvider.getDefaultWorkspaceSuffix(), |
| PathFragment.create("/DEFAULT.WORKSPACE.SUFFIX")), |
| ast.getStatements(), |
| env.getListener()); |
| if (ast.containsErrors()) { |
| throw new WorkspaceASTFunctionException( |
| new BuildFileContainsErrorsException( |
| Label.EXTERNAL_PACKAGE_IDENTIFIER, "Failed to parse default WORKSPACE file suffix"), |
| Transience.PERSISTENT); |
| } |
| return new WorkspaceASTValue(splitAST(ast)); |
| } catch (IOException ex) { |
| throw new WorkspaceASTFunctionException(ex, Transience.TRANSIENT); |
| } |
| } |
| |
| /** |
| * Cut {@code ast} into a list of AST separated by load statements. We cut right before each load |
| * statement series. |
| */ |
| private static ImmutableList<BuildFileAST> splitAST(BuildFileAST ast) { |
| ImmutableList.Builder<BuildFileAST> asts = ImmutableList.builder(); |
| int prevIdx = 0; |
| boolean lastIsLoad = true; // don't cut if the first statement is a load. |
| List<Statement> statements = ast.getStatements(); |
| for (int idx = 0; idx < statements.size(); idx++) { |
| Statement st = statements.get(idx); |
| if (st instanceof LoadStatement) { |
| if (!lastIsLoad) { |
| asts.add(ast.subTree(prevIdx, idx)); |
| prevIdx = idx; |
| } |
| lastIsLoad = true; |
| } else { |
| lastIsLoad = false; |
| } |
| } |
| if (!statements.isEmpty()) { |
| asts.add(ast.subTree(prevIdx, statements.size())); |
| } |
| return asts.build(); |
| } |
| |
| private static final class WorkspaceASTFunctionException extends SkyFunctionException { |
| WorkspaceASTFunctionException(BuildFileContainsErrorsException e, Transience transience) { |
| super(e, transience); |
| } |
| WorkspaceASTFunctionException(IOException e, Transience transience) { |
| super(e, transience); |
| } |
| } |
| @Override |
| public String extractTag(SkyKey skyKey) { |
| return null; |
| } |
| } |