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// Copyright 2014 Google Inc. 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;
import com.google.common.base.Function;
import com.google.common.collect.Iterables;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.collect.nestedset.NestedSet;
import com.google.devtools.build.lib.events.Location;
import com.google.devtools.build.lib.syntax.EvalException;
import com.google.devtools.build.lib.syntax.SkylarkBuiltin;
import com.google.devtools.build.lib.syntax.SkylarkBuiltin.Param;
import com.google.devtools.build.lib.syntax.SkylarkFunction.SimpleSkylarkFunction;
import com.google.devtools.build.lib.syntax.SkylarkList;
import com.google.devtools.build.lib.syntax.SkylarkModule;
import com.google.devtools.build.lib.syntax.SkylarkNestedSet;
import java.util.Map;
/**
* A Skylark module class to create memory efficient command lines.
*/
@SkylarkModule(name = "cmd_helper", namespace = true,
doc = "Module for creating memory efficient command lines.")
public class SkylarkCommandLine {
@SkylarkBuiltin(name = "join_paths",
doc = "Creates a single command line argument joining the paths of a set "
+ "of files on the separator string.",
objectType = SkylarkCommandLine.class,
returnType = String.class,
mandatoryParams = {
@Param(name = "separator", type = String.class, doc = "the separator string to join on"),
@Param(name = "files", type = SkylarkNestedSet.class, generic1 = Artifact.class,
doc = "the files to concatenate")})
private static SimpleSkylarkFunction joinPaths =
new SimpleSkylarkFunction("join_paths") {
@Override
public Object call(Map<String, Object> params, Location loc)
throws EvalException {
final String separator = (String) params.get("separator");
final NestedSet<Artifact> artifacts =
((SkylarkNestedSet) params.get("files")).getSet(Artifact.class);
// TODO(bazel-team): lazy evaluate
return Artifact.joinExecPaths(separator, artifacts);
}
};
// TODO(bazel-team): this method should support sets of objects and substitute all struct fields.
@SkylarkBuiltin(name = "template",
doc = "Transforms a set of files to a list of strings using the template string.",
objectType = SkylarkCommandLine.class,
returnType = SkylarkList.class,
mandatoryParams = {
@Param(name = "items", type = SkylarkNestedSet.class, generic1 = Artifact.class,
doc = "The set of structs to transform."),
@Param(name = "template", type = String.class,
doc = "The template to use for the transformation, %{path} and %{short_path} "
+ "being substituted with the corresponding fields of each file.")})
private static SimpleSkylarkFunction template = new SimpleSkylarkFunction("template") {
@Override
public Object call(Map<String, Object> params, Location loc)
throws EvalException {
final String template = (String) params.get("template");
SkylarkNestedSet items = (SkylarkNestedSet) params.get("items");
return SkylarkList.lazyList(Iterables.transform(items, new Function<Object, String>() {
@Override
public String apply(Object input) {
Artifact artifact = (Artifact) input;
return template
.replace("%{path}", artifact.getExecPathString())
.replace("%{short_path}", artifact.getRootRelativePathString());
}
}), String.class);
}
};
}
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