// Copyright (C) 2005 Google Inc.
//
// 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.caja.parser.js;
import com.google.caja.lexer.FilePosition;
import com.google.caja.lexer.TokenConsumer;
import com.google.caja.parser.ParseTreeNode;
import com.google.caja.reporting.RenderContext;
import java.util.List;
/**
* A group of statements executed serially
* (except that FunctionDeclarations are hoisted).
*
* @author mikesamuel@gmail.com
*/
public final class Block extends AbstractStatement implements NestedScope {
private static final long serialVersionUID = 9160842282840140257L;
/** @param value unused. This ctor is provided for reflection. */
@ReflectiveCtor
public Block(
FilePosition pos, Void value, List<? extends Statement> children) {
this(pos, children);
}
public Block(FilePosition pos, List<? extends Statement> elements) {
super(pos, Statement.class);
ctorAppendChildren(elements);
}
public Block(FilePosition pos) { super(pos, Statement.class); }
public Block() { this(FilePosition.UNKNOWN); }
@Override
public List<? extends Statement> children() {
return childrenAs(Statement.class);
}
public void prepend(Statement statement) {
insertBefore(statement, children().isEmpty() ? null : children().get(0));
}
@Override
protected void childrenChanged() {
super.childrenChanged();
boolean first = true;
for (ParseTreeNode child : children()) {
if (first) {
first = false;
} else if (child instanceof DirectivePrologue) {
throw new IllegalArgumentException("Misplaced directive prologoue " +
child.getFilePosition());
}
if (!(child instanceof Statement)) {
throw new ClassCastException("Expected statement, not " + child);
}
}
}
@Override
public Object getValue() { return null; }
@Override
public void renderBlock(RenderContext rc, boolean terminate) {
TokenConsumer out = rc.getOut();
out.mark(getFilePosition());
out.consume("{");
renderBody(rc);
out.consume("}");
}
public void renderBody(RenderContext rc) {
TokenConsumer out = rc.getOut();
for (Statement stmt : children()) {
out.mark(stmt.getFilePosition());
stmt.render(rc);
if (!stmt.isTerminal()) {
out.mark(FilePosition.endOfOrNull(stmt.getFilePosition()));
out.consume(";");
}
}
out.mark(FilePosition.endOfOrNull(getFilePosition()));
}
public void render(RenderContext rc) {
renderBlock(rc, false);
}
@Override
public boolean isTerminal() {
return true;
}
public boolean hasHangingConditional() { return false; }
}