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// Copyright 2014 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.devtools.build.lib.syntax;
import com.google.common.base.Joiner;
import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.vfs.PathFragment;
import java.util.List;
/**
* Syntax node for an import statement.
*/
public final class LoadStatement extends Statement {
private final ImmutableList<Ident> symbols;
private final PathFragment importPath;
/**
* Constructs an import statement.
*/
LoadStatement(String path, List<Ident> symbols) {
this.symbols = ImmutableList.copyOf(symbols);
this.importPath = new PathFragment(path + ".bzl");
}
public ImmutableList<Ident> getSymbols() {
return symbols;
}
public PathFragment getImportPath() {
return importPath;
}
@Override
public String toString() {
return String.format("load(\"%s\", %s)", importPath, Joiner.on(", ").join(symbols));
}
@Override
void exec(Environment env) throws EvalException, InterruptedException {
for (Ident i : symbols) {
try {
if (i.getName().startsWith("_")) {
throw new EvalException(getLocation(), "symbol '" + i + "' is private and cannot "
+ "be imported");
}
env.importSymbol(getImportPath(), i.getName());
} catch (Environment.NoSuchVariableException | Environment.LoadFailedException e) {
throw new EvalException(getLocation(), e.getMessage());
}
}
}
@Override
public void accept(SyntaxTreeVisitor visitor) {
visitor.visit(this);
}
@Override
void validate(ValidationEnvironment env) throws EvalException {
// TODO(bazel-team): implement semantical check.
for (Ident symbol : symbols) {
env.update(symbol.getName(), SkylarkType.UNKNOWN, getLocation());
}
}
}
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