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/*
* Copyright 2017 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.turbine.binder.lookup;
import com.google.turbine.binder.sym.ClassSymbol;
import com.google.turbine.tree.Tree;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* A scope for imports. Non-canonical imports depend on hierarchy analysis, so to break the cycle we
* defer non-canonical resolution to a {@link ResolveFunction} that is provided once hierarchy
* analysis is underway.
*/
public interface ImportScope {
/**
* A function that performs non-canonical resolution, see {@link
* com.google.turbine.binder.Resolve#resolve}.
*/
@FunctionalInterface
interface ResolveFunction {
@Nullable
ClassSymbol resolveOne(ClassSymbol base, Tree.Ident name);
}
/** See {@link Scope#lookup(LookupKey)}. */
@Nullable
LookupResult lookup(LookupKey lookupKey, ResolveFunction resolve);
/** Adds a scope to the chain, in the manner of {@link CompoundScope#append(Scope)}. */
default ImportScope append(ImportScope next) {
return new ImportScope() {
@Override
public @Nullable LookupResult lookup(LookupKey lookupKey, ResolveFunction resolve) {
LookupResult result = next.lookup(lookupKey, resolve);
if (result != null) {
return result;
}
return ImportScope.this.lookup(lookupKey, resolve);
}
};
}
/**
* Creates a trivial {@link ImportScope} from a {@link Scope}, which ignores the provided {@link
* ResolveFunction} and calls the underlying scope's lookup method. Used to chain {@link Scope}s
* and {@link ImportScope}s together.
*/
static ImportScope fromScope(Scope scope) {
return new ImportScope() {
@Override
public @Nullable LookupResult lookup(LookupKey lookupKey, ResolveFunction resolve) {
return scope.lookup(lookupKey);
}
};
}
/** Partially applies the given {@link ResolveFunction} to this {@link ImportScope}. */
default CompoundScope toScope(ResolveFunction resolve) {
return CompoundScope.base(
new Scope() {
@Override
public @Nullable LookupResult lookup(LookupKey lookupKey) {
return ImportScope.this.lookup(lookupKey, resolve);
}
});
}
}
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