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// Copyright 2014 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.syntax;
import com.google.common.collect.ImmutableList;
import java.util.List;
/** Syntax node for an import statement. */
public final class LoadStatement extends Statement {
/**
* Binding represents a binding in a load statement. load("...", local = "orig")
*
* <p>If there's no alias, a single Identifier can be used for both local and orig.
*/
public static final class Binding {
private final Identifier local;
private final Identifier orig;
public Identifier getLocalName() {
return local;
}
public Identifier getOriginalName() {
return orig;
}
Binding(Identifier localName, Identifier originalName) {
this.local = localName;
this.orig = originalName;
}
}
private final ImmutableList<Binding> bindings;
private final StringLiteral imp;
private final boolean mayLoadInternalSymbols;
/**
* Constructs an import statement.
*
* <p>{@code bindings} maps a symbol to the original name under which it was defined in the bzl
* file that should be loaded. If aliasing is used, the value differs from its key's {@code
* symbol.getName()}. Otherwise, both values are identical.
*
* <p>Import statements generated this way are bound to the usual restriction that private symbols
* cannot be loaded.
*/
LoadStatement(StringLiteral imp, List<Binding> bindings) {
this.imp = imp;
this.bindings = ImmutableList.copyOf(bindings);
this.mayLoadInternalSymbols = false;
}
private LoadStatement(StringLiteral imp, List<Binding> bindings, boolean mayLoadInternalSymbols) {
this.imp = imp;
this.bindings = ImmutableList.copyOf(bindings);
this.mayLoadInternalSymbols = mayLoadInternalSymbols;
}
/**
* Out of a {@code LoadStatement} construct a new one loading the same symbols, but free from the
* usual visibility restriction of not being able to load private symbols.
*/
public static LoadStatement allowLoadingOfInternalSymbols(LoadStatement load) {
return new LoadStatement(load.getImport(), load.getBindings(), true);
}
public ImmutableList<Binding> getBindings() {
return bindings;
}
public StringLiteral getImport() {
return imp;
}
/**
* Indicate whether this import statement is exempt from the restriction that private symbols may
* not be loaded.
*/
public boolean mayLoadInternalSymbols() {
return mayLoadInternalSymbols;
}
@Override
public void accept(NodeVisitor visitor) {
visitor.visit(this);
}
@Override
public Kind kind() {
return Kind.LOAD;
}
}