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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 com.google.devtools.build.lib.events.Location;
import java.io.IOException;
import java.util.List;
/** Syntax node for dictionary literals. */
public final class DictionaryLiteral extends Expression {
/** Node for an individual key-value pair in a dictionary literal. */
public static final class DictionaryEntryLiteral extends ASTNode {
private final Expression key;
private final Expression value;
public DictionaryEntryLiteral(Expression key, Expression value) {
this.key = key;
this.value = value;
}
public Expression getKey() {
return key;
}
public Expression getValue() {
return value;
}
@Override
public void prettyPrint(Appendable buffer, int indentLevel) throws IOException {
key.prettyPrint(buffer);
buffer.append(": ");
value.prettyPrint(buffer);
}
@Override
public void accept(SyntaxTreeVisitor visitor) {
visitor.visit(this);
}
}
private final ImmutableList<DictionaryEntryLiteral> entries;
public DictionaryLiteral(List<DictionaryEntryLiteral> entries) {
this.entries = ImmutableList.copyOf(entries);
}
/** A new literal for an empty dictionary, onto which a new location can be specified */
public static DictionaryLiteral emptyDict() {
return new DictionaryLiteral(ImmutableList.of());
}
@Override
Object doEval(Environment env) throws EvalException, InterruptedException {
SkylarkDict<Object, Object> dict = SkylarkDict.of(env);
Location loc = getLocation();
for (DictionaryEntryLiteral entry : entries) {
Object key = entry.key.eval(env);
Object val = entry.value.eval(env);
if (dict.containsKey(key)) {
throw new EvalException(
loc, "Duplicated key " + Printer.repr(key) + " when creating dictionary");
}
dict.put(key, val, loc, env);
}
return dict;
}
@Override
public void prettyPrint(Appendable buffer) throws IOException {
buffer.append("{");
String sep = "";
for (DictionaryEntryLiteral e : entries) {
buffer.append(sep);
e.prettyPrint(buffer);
sep = ", ";
}
buffer.append("}");
}
@Override
public void accept(SyntaxTreeVisitor visitor) {
visitor.visit(this);
}
@Override
public Kind kind() {
return Kind.DICTIONARY_LITERAL;
}
public ImmutableList<DictionaryEntryLiteral> getEntries() {
return entries;
}
}
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