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// 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.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.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.getRelativePath());
try {
BuildFileAST ast = BuildFileAST.parseBuildFile(
ParserInputSource.create(ruleClassProvider.getDefaultWorkspacePrefix(),
new PathFragment("/DEFAULT.WORKSPACE")),
env.getListener(), false);
if (ast.containsErrors()) {
throw new WorkspaceASTFunctionException(
new IOException("Failed to parse default WORKSPACE file"), Transience.PERSISTENT);
}
if (workspaceFileValue.exists()) {
ast = BuildFileAST.parseBuildFile(
ParserInputSource.create(repoWorkspace), ast.getStatements(), env.getListener(), false);
if (ast.containsErrors()) {
throw new WorkspaceASTFunctionException(
new IOException("Failed to parse WORKSPACE file"), Transience.PERSISTENT);
}
}
ast = BuildFileAST.parseBuildFile(
ParserInputSource.create(ruleClassProvider.getDefaultWorkspaceSuffix(),
new PathFragment("/DEFAULT.WORKSPACE.SUFFIX")),
ast.getStatements(),
env.getListener(),
false);
if (ast.containsErrors()) {
throw new WorkspaceASTFunctionException(
new IOException("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 {
public WorkspaceASTFunctionException(Exception e, Transience transience) {
super(e, transience);
}
}
@Override
public String extractTag(SkyKey skyKey) {
return null;
}
}
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