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// 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.packages;
import com.google.common.base.Joiner;
import com.google.common.collect.ImmutableCollection;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Sets;
import com.google.common.collect.Sets.SetView;
import com.google.devtools.build.lib.events.Location;
import com.google.devtools.build.lib.packages.NativeProvider.StructConstructor;
import com.google.devtools.build.lib.syntax.Concatable;
import com.google.devtools.build.lib.syntax.EvalException;
import com.google.devtools.build.lib.syntax.EvalUtils;
import java.util.Map;
/** Implementation of {@link Info} created from Skylark. */
public final class SkylarkInfo extends Info implements Concatable {
protected final ImmutableMap<String, Object> values;
public SkylarkInfo(Provider provider, Map<String, Object> kwargs, Location loc) {
super(provider, loc);
this.values = copyValues(kwargs);
}
public SkylarkInfo(StructConstructor provider, Map<String, Object> values, String message) {
super(provider, values, message);
this.values = copyValues(values);
}
@Override
public Concatter getConcatter() {
return StructConcatter.INSTANCE;
}
@Override
public Object getValue(String name) {
return values.get(name);
}
@Override
public boolean hasKey(String name) {
return values.containsKey(name);
}
@Override
public ImmutableCollection<String> getKeys() {
return values.keySet();
}
@Override
public boolean isImmutable() {
// If the provider is not yet exported the hash code of the object is subject to change
if (!getProvider().isExported()) {
return false;
}
for (Object item : values.values()) {
if (!EvalUtils.isImmutable(item)) {
return false;
}
}
return true;
}
private static class StructConcatter implements Concatter {
private static final StructConcatter INSTANCE = new StructConcatter();
private StructConcatter() {}
@Override
public SkylarkInfo concat(Concatable left, Concatable right, Location loc)
throws EvalException {
SkylarkInfo lval = (SkylarkInfo) left;
SkylarkInfo rval = (SkylarkInfo) right;
if (!lval.getProvider().equals(rval.getProvider())) {
throw new EvalException(
loc,
String.format(
"Cannot concat %s with %s",
lval.getProvider().getPrintableName(), rval.getProvider().getPrintableName()));
}
SetView<String> commonFields = Sets.intersection(lval.values.keySet(), rval.values.keySet());
if (!commonFields.isEmpty()) {
throw new EvalException(
loc,
"Cannot concat structs with common field(s): " + Joiner.on(",").join(commonFields));
}
return new SkylarkInfo(
lval.getProvider(),
ImmutableMap.<String, Object>builder().putAll(lval.values).putAll(rval.values).build(),
loc);
}
}
}
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