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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.rules.objc;
import com.google.common.annotations.VisibleForTesting;
import com.google.devtools.build.lib.rules.apple.AppleToolchain;
import com.google.devtools.build.lib.rules.objc.ObjcProvider.Key;
import com.google.devtools.build.lib.skylarkinterface.Param;
import com.google.devtools.build.lib.skylarkinterface.SkylarkCallable;
import com.google.devtools.build.lib.skylarkinterface.SkylarkModule;
import com.google.devtools.build.lib.skylarkinterface.SkylarkSignature;
import com.google.devtools.build.lib.syntax.BuiltinFunction;
import com.google.devtools.build.lib.syntax.SkylarkDict;
import com.google.devtools.build.lib.syntax.SkylarkSignatureProcessor;
import java.util.Map.Entry;
/**
* A class that exposes apple rule implementation internals to skylark.
*/
@SkylarkModule(
name = "apple_common",
doc = "Functions for skylark to access internals of the apple rule implementations."
)
public class AppleSkylarkCommon {
@VisibleForTesting
public static final String BAD_KEY_ERROR = "Argument %s not a recognized key or 'providers'.";
@VisibleForTesting
public static final String BAD_SET_TYPE_ERROR =
"Value for key %s must be a set of %s, instead found set of %s.";
@VisibleForTesting
public static final String BAD_PROVIDERS_ITER_ERROR =
"Value for argument 'providers' must be a list of ObjcProvider instances, instead found %s.";
@VisibleForTesting
public static final String BAD_PROVIDERS_ELEM_ERROR =
"Value for argument 'providers' must be a list of ObjcProvider instances, instead found "
+ "iterable with %s.";
@VisibleForTesting
public static final String NOT_SET_ERROR = "Value for key %s must be a set, instead found %s.";
@VisibleForTesting
public static final String MISSING_KEY_ERROR = "No value for required key %s was present.";
@SkylarkCallable(
name = "apple_toolchain",
doc = "Utilities for resolving items from the apple toolchain."
)
public AppleToolchain getAppleToolchain() {
return new AppleToolchain();
}
@SkylarkSignature(
name = "new_objc_provider",
objectType = AppleSkylarkCommon.class,
returnType = ObjcProvider.class,
doc = "Creates a new ObjcProvider instance.",
parameters = {
@Param(name = "self", type = AppleSkylarkCommon.class, doc = "The apple_common instance."),
@Param(
name = "uses_swift",
type = Boolean.class,
defaultValue = "False",
named = true,
positional = false,
doc = "Whether this provider should enable Swift support."
)
},
extraKeywords =
@Param(
name = "kwargs",
type = SkylarkDict.class,
defaultValue = "{}",
doc = "Dictionary of arguments"
)
)
public static final BuiltinFunction NEW_OBJC_PROVIDER =
new BuiltinFunction("new_objc_provider") {
@SuppressWarnings("unused")
// This method is registered statically for skylark, and never called directly.
public ObjcProvider invoke(
AppleSkylarkCommon self, Boolean usesSwift, SkylarkDict<String, Object> kwargs) {
ObjcProvider.Builder resultBuilder = new ObjcProvider.Builder();
if (usesSwift) {
resultBuilder.add(ObjcProvider.FLAG, ObjcProvider.Flag.USES_SWIFT);
}
for (Entry<String, Object> entry : kwargs.entrySet()) {
Key<?> key = ObjcProvider.getSkylarkKeyForString(entry.getKey());
if (key != null) {
resultBuilder.addElementsFromSkylark(key, entry.getValue());
} else if (entry.getKey().equals("providers")) {
resultBuilder.addProvidersFromSkylark(entry.getValue());
} else {
throw new IllegalArgumentException(String.format(BAD_KEY_ERROR, entry.getKey()));
}
}
return resultBuilder.build();
}
};
static {
SkylarkSignatureProcessor.configureSkylarkFunctions(AppleSkylarkCommon.class);
}
}
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