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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.packages;
import com.google.devtools.build.lib.skylarkinterface.SkylarkModule;
import com.google.devtools.build.lib.skylarkinterface.SkylarkSignature;
import com.google.devtools.build.lib.skylarkinterface.SkylarkSignature.Param;
import com.google.devtools.build.lib.syntax.BuiltinFunction;
import com.google.devtools.build.lib.syntax.Environment;
import com.google.devtools.build.lib.syntax.EvalException;
import com.google.devtools.build.lib.syntax.FuncallExpression;
import com.google.devtools.build.lib.syntax.Runtime;
import com.google.devtools.build.lib.syntax.SkylarkList;
import com.google.devtools.build.lib.syntax.SkylarkSignatureProcessor;
import com.google.devtools.build.lib.syntax.Type.ConversionException;
/**
* A class for the Skylark native module.
*/
@SkylarkModule(name = "native", namespace = true, doc =
"A built-in module to support native rules and other package helper functions. "
+ "All native rules appear as functions in this module, e.g. <code>native.cc_library</code>. "
+ "Note that the native module is only available in the loading phase "
+ "(i.e. for macros, not for rule implementations). Attributes will ignore <code>None</code> "
+ "values, and treat them as if the attribute was unset.<br>"
+ "The following functions are also available:")
public class SkylarkNativeModule {
// TODO(bazel-team): shouldn't we return a SkylarkList instead?
@SkylarkSignature(name = "glob", objectType = SkylarkNativeModule.class,
returnType = SkylarkList.class,
doc = "Glob returns a list of every file in the current package that:<ul>\n"
+ "<li>Matches at least one pattern in <code>include</code>.</li>\n"
+ "<li>Does not match any of the patterns in <code>exclude</code> "
+ "(default <code>[]</code>).</li></ul>\n"
+ "If the <code>exclude_directories</code> argument is enabled (set to <code>1</code>), "
+ "files of type directory will be omitted from the results (default <code>1</code>).",
mandatoryPositionals = {
@Param(name = "include", type = SkylarkList.class, generic1 = String.class,
defaultValue = "[]", doc = "The list of glob patterns to include.")},
optionalPositionals = {
@Param(name = "exclude", type = SkylarkList.class, generic1 = String.class,
defaultValue = "[]", doc = "The list of glob patterns to exclude."),
// TODO(bazel-team): accept booleans as well as integers? (and eventually migrate?)
@Param(name = "exclude_directories", type = Integer.class, defaultValue = "1",
doc = "A flag whether to exclude directories or not.")},
useAst = true, useEnvironment = true)
private static final BuiltinFunction glob = new BuiltinFunction("glob") {
public SkylarkList invoke(
SkylarkList include, SkylarkList exclude,
Integer excludeDirectories, FuncallExpression ast, Environment env)
throws EvalException, ConversionException, InterruptedException {
env.checkLoadingPhase("native.glob", ast.getLocation());
return PackageFactory.callGlob(
null, false, include, exclude, excludeDirectories != 0, ast, env);
}
};
@SkylarkSignature(name = "package_group", objectType = SkylarkNativeModule.class,
returnType = Runtime.NoneType.class,
doc = "This function defines a set of packages and assigns a label to the group. "
+ "The label can be referenced in <code>visibility</code> attributes.",
mandatoryNamedOnly = {
@Param(name = "name", type = String.class,
doc = "The unique name for this rule.")},
optionalNamedOnly = {
@Param(name = "packages", type = SkylarkList.class, generic1 = String.class,
defaultValue = "[]",
doc = "A complete enumeration of packages in this group."),
@Param(name = "includes", type = SkylarkList.class, generic1 = String.class,
defaultValue = "[]",
doc = "Other package groups that are included in this one.")},
useAst = true, useEnvironment = true)
private static final BuiltinFunction packageGroup = new BuiltinFunction("package_group") {
public Runtime.NoneType invoke(String name, SkylarkList packages, SkylarkList includes,
FuncallExpression ast, Environment env) throws EvalException, ConversionException {
env.checkLoadingPhase("native.package_group", ast.getLocation());
return PackageFactory.callPackageFunction(name, packages, includes, ast, env);
}
};
@SkylarkSignature(name = "exports_files", objectType = SkylarkNativeModule.class,
returnType = Runtime.NoneType.class,
doc = "Specifies a list of files belonging to this package that are exported to other "
+ "packages but not otherwise mentioned.",
mandatoryPositionals = {
@Param(name = "srcs", type = SkylarkList.class, generic1 = String.class,
doc = "The list of files to export.")},
optionalPositionals = {
// TODO(bazel-team): make it possible to express the precise type ListOf(LabelDesignator)
@Param(name = "visibility", type = SkylarkList.class,
noneable = true,
doc = "A visibility declaration can to be specified. The files will be visible to the "
+ "targets specified. If no visibility is specified, the files will be visible to "
+ "every package."),
@Param(name = "licenses", type = SkylarkList.class, generic1 = String.class, noneable = true,
doc = "Licenses to be specified.")},
useAst = true, useEnvironment = true)
private static final BuiltinFunction exportsFiles = new BuiltinFunction("exports_files") {
public Runtime.NoneType invoke(SkylarkList srcs, Object visibility, Object licenses,
FuncallExpression ast, Environment env)
throws EvalException, ConversionException {
env.checkLoadingPhase("native.exports_files", ast.getLocation());
return PackageFactory.callExportsFiles(srcs, visibility, licenses, ast, env);
}
};
public static final SkylarkNativeModule NATIVE_MODULE = new SkylarkNativeModule();
static {
SkylarkSignatureProcessor.configureSkylarkFunctions(SkylarkNativeModule.class);
}
}
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