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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.base.Preconditions;
import com.google.common.collect.ImmutableCollection;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
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.Arrays;
import java.util.Map;
/** Implementation of {@link Info} created from Skylark. */
public abstract class SkylarkInfo extends Info implements Concatable {
public SkylarkInfo(Provider provider, Location loc) {
super(provider, loc);
}
public SkylarkInfo(StructConstructor provider, Map<String, Object> values, String message) {
super(provider, values, message);
}
@Override
public Concatter getConcatter() {
return SkylarkInfoConcatter.INSTANCE;
}
@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 : getValues()) {
if (item != null && !EvalUtils.isImmutable(item)) {
return false;
}
}
return true;
}
/** Return all the values stored in the object. */
protected abstract Iterable<Object> getValues();
/**
* {@link SkylarkInfo} implementation that stores its values in a map. This is mainly used for the
* Skylark {@code struct()} constructor.
*/
static final class MapBackedSkylarkInfo extends SkylarkInfo {
protected final ImmutableMap<String, Object> values;
public MapBackedSkylarkInfo(Provider provider, Map<String, Object> kwargs, Location loc) {
super(provider, loc);
this.values = copyValues(kwargs);
}
public MapBackedSkylarkInfo(
StructConstructor provider, Map<String, Object> values, String message) {
super(provider, values, message);
this.values = copyValues(values);
}
@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
protected Iterable<Object> getValues() {
return values.values();
}
}
/** Create a {@link SkylarkInfo} instance from a provider and a map. */
public static SkylarkInfo fromMap(Provider provider, Map<String, Object> values, Location loc) {
return new MapBackedSkylarkInfo(provider, values, loc);
}
/** Implementation of {@link SkylarkInfo} that stores its values in array to save space. */
static final class CompactSkylarkInfo extends SkylarkInfo implements Concatable {
private final ImmutableMap<String, Integer> layout;
private final Object[] values;
public CompactSkylarkInfo(
Provider provider, ImmutableMap<String, Integer> layout, Object[] values, Location loc) {
super(provider, loc);
Preconditions.checkState(layout.size() == values.length);
this.layout = layout;
this.values = values;
}
@Override
public Concatter getConcatter() {
return SkylarkInfoConcatter.INSTANCE;
}
@Override
public Object getValue(String name) {
Integer index = layout.get(name);
if (index == null) {
return null;
}
return values[index];
}
@Override
public boolean hasKey(String name) {
Integer index = layout.get(name);
return index != null && values[index] != null;
}
@Override
public ImmutableCollection<String> getKeys() {
ImmutableSet.Builder<String> result = new ImmutableSet.Builder();
for (Map.Entry<String, Integer> entry : layout.entrySet()) {
if (values[entry.getValue()] != null) {
result.add(entry.getKey());
}
}
return result.build();
}
@Override
protected Iterable<Object> getValues() {
return Arrays.asList(values);
}
}
/** Concatter for concrete {@link SkylarkInfo} subclasses. */
private static final class SkylarkInfoConcatter implements Concatable.Concatter {
private static final SkylarkInfoConcatter INSTANCE = new SkylarkInfoConcatter();
private SkylarkInfoConcatter() {}
@Override
public Concatable concat(Concatable left, Concatable right, Location loc) throws EvalException {
SkylarkInfo lval = (SkylarkInfo) left;
SkylarkInfo rval = (SkylarkInfo) right;
Provider provider = lval.getProvider();
if (!provider.equals(rval.getProvider())) {
throw new EvalException(
loc,
String.format(
"Cannot concat %s with %s",
provider.getPrintableName(), rval.getProvider().getPrintableName()));
}
SetView<String> commonFields =
Sets.intersection(
ImmutableSet.copyOf(lval.getKeys()), ImmutableSet.copyOf(rval.getKeys()));
if (!commonFields.isEmpty()) {
throw new EvalException(
loc,
"Cannot concat structs with common field(s): " + Joiner.on(",").join(commonFields));
}
// Keep homogeneous compact concatenations compact.
if (lval instanceof CompactSkylarkInfo
&& rval instanceof CompactSkylarkInfo
&& ((CompactSkylarkInfo) lval).layout == ((CompactSkylarkInfo) rval).layout) {
CompactSkylarkInfo compactLeft = (CompactSkylarkInfo) lval;
CompactSkylarkInfo compactRight = (CompactSkylarkInfo) rval;
int nvals = compactLeft.layout.size();
Preconditions.checkState(nvals == compactRight.layout.size());
Object[] newValues = new Object[nvals];
for (int i = 0; i < nvals; i++) {
newValues[i] =
(compactLeft.values[i] != null) ? compactLeft.values[i] : compactRight.values[i];
}
return new CompactSkylarkInfo(
compactLeft.getProvider(), compactLeft.layout, newValues, loc);
}
ImmutableMap.Builder<String, Object> newValues = ImmutableMap.builder();
for (String key : lval.getKeys()) {
newValues.put(key, lval.getValue(key));
}
for (String key : rval.getKeys()) {
newValues.put(key, rval.getValue(key));
}
return new MapBackedSkylarkInfo(provider, newValues.build(), loc);
}
}
}
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