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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.collect.ImmutableList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
/**
* Syntax node for dictionary literals.
*/
public class DictionaryLiteral extends Expression {
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;
}
Expression getKey() {
return key;
}
Expression getValue() {
return value;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append(key);
sb.append(": ");
sb.append(value);
return sb.toString();
}
@Override
public void accept(SyntaxTreeVisitor visitor) {
visitor.visit(this);
}
}
private final ImmutableList<DictionaryEntryLiteral> entries;
public DictionaryLiteral(List<DictionaryEntryLiteral> exprs) {
this.entries = ImmutableList.copyOf(exprs);
}
@Override
Object eval(Environment env) throws EvalException, InterruptedException {
// We need LinkedHashMap to maintain the order during iteration (e.g. for loops)
Map<Object, Object> map = new LinkedHashMap<>();
for (DictionaryEntryLiteral entry : entries) {
if (entry == null) {
throw new EvalException(getLocation(), "null expression in " + this);
}
map.put(entry.key.eval(env), entry.value.eval(env));
}
return map;
}
@Override
public String toString() {
StringBuffer sb = new StringBuffer();
sb.append("{");
String sep = "";
for (DictionaryEntryLiteral e : entries) {
sb.append(sep);
sb.append(e);
sep = ", ";
}
sb.append("}");
return sb.toString();
}
@Override
public void accept(SyntaxTreeVisitor visitor) {
visitor.visit(this);
}
public ImmutableList<DictionaryEntryLiteral> getEntries() {
return entries;
}
@Override
SkylarkType validate(ValidationEnvironment env) throws EvalException {
SkylarkType type = SkylarkType.UNKNOWN;
for (DictionaryEntryLiteral entry : entries) {
SkylarkType nextType = entry.key.validate(env);
entry.value.validate(env);
if (!nextType.isSimple()) {
throw new EvalException(getLocation(),
String.format("Dict cannot contain composite type '%s' as key", nextType));
}
type = type.infer(nextType, "dict literal", entry.getLocation(), getLocation());
}
return SkylarkType.of(Map.class, type.getType());
}
}
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