blob: 6b25859bf2d2a249134337a22ab0854654efccb3 [file] [log] [blame]
// Copyright 2017 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.skylarkbuildapi;
import com.google.devtools.build.lib.skylarkinterface.SkylarkModule;
import com.google.devtools.build.lib.skylarkinterface.SkylarkModuleCategory;
import com.google.devtools.build.lib.skylarkinterface.SkylarkValue;
/** Interface for provider objects (constructors for {@link StructApi} objects). */
@SkylarkModule(
name = "Provider",
category = SkylarkModuleCategory.BUILTIN,
doc =
"A constructor for simple value objects, known as provider instances."
+ "<br>"
+ "This value has a dual purpose:"
+ " <ul>"
+ " <li>It is a function that can be called to construct 'struct'-like values:"
+ "<pre class=\"language-python\">DataInfo = provider()\n"
+ "d = DataInfo(x = 2, y = 3)\n"
+ "print(d.x + d.y) # prints 5</pre>"
+ " Note: Some providers, defined internally, do not allow instance creation"
+ " </li>"
+ " <li>It is a <i>key</i> to access a provider instance on a"
+ " <a href=\"Target.html\">Target</a>"
+ "<pre class=\"language-python\">DataInfo = provider()\n"
+ "def _rule_impl(ctx)\n"
+ " ... ctx.attr.dep[DataInfo]</pre>"
+ " </li>"
+ " </ul>"
+ "Create a new <code>Provider</code> using the "
+ "<a href=\"globals.html#provider\">provider</a> function.")
public interface ProviderApi extends SkylarkValue {}