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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.base.Joiner;
import com.google.common.base.Optional;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.devtools.build.lib.events.Location;
import com.google.devtools.build.lib.syntax.compiler.DebugInfo;
import com.google.devtools.build.lib.syntax.compiler.LoopLabels;
import com.google.devtools.build.lib.syntax.compiler.VariableScope;
import net.bytebuddy.implementation.bytecode.ByteCodeAppender;
import java.util.Map;
/**
* Syntax node for an import statement.
*/
public final class LoadStatement extends Statement {
private final ImmutableMap<Identifier, String> symbols;
private final ImmutableList<Identifier> cachedSymbols; // to save time
private final SkylarkImport imp;
private final Location importLocation;
/**
* Constructs an import statement.
*
* <p>{@code symbols} 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.
*/
LoadStatement(SkylarkImport imp, Location importLocation, Map<Identifier, String> symbols) {
this.imp = imp;
this.importLocation = importLocation;
this.symbols = ImmutableMap.copyOf(symbols);
this.cachedSymbols = ImmutableList.copyOf(symbols.keySet());
}
public Location getImportLocation() {
return importLocation;
}
public ImmutableList<Identifier> getSymbols() {
return cachedSymbols;
}
public SkylarkImport getImport() {
return imp;
}
@Override
public String toString() {
return String.format(
"load(\"%s\", %s)", imp.getImportString(), Joiner.on(", ").join(cachedSymbols));
}
@Override
void doExec(Environment env) throws EvalException, InterruptedException {
for (Map.Entry<Identifier, String> entry : symbols.entrySet()) {
try {
Identifier current = entry.getKey();
if (current.isPrivate()) {
throw new EvalException(
getLocation(), "symbol '" + current + "' is private and cannot be imported.");
}
// The key is the original name that was used to define the symbol
// in the loaded bzl file.
env.importSymbol(imp.getImportString(), current, entry.getValue());
} 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 {
for (Identifier symbol : cachedSymbols) {
env.declare(symbol.getName(), getLocation());
}
}
@Override
ByteCodeAppender compile(
VariableScope scope, Optional<LoopLabels> loopLabels, DebugInfo debugInfo) {
throw new UnsupportedOperationException(
"load statements should never appear in method bodies and"
+ " should never be compiled in general");
}
}
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