org.mozilla.javascript.ast.AstRoot Maven / Gradle / Ivy
/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.javascript.ast;
import org.mozilla.javascript.Node;
import org.mozilla.javascript.Token;
import java.util.SortedSet;
import java.util.TreeSet;
/**
* Node for the root of a parse tree. It contains the statements and functions
* in the script, and a list of {@link Comment} nodes associated with the script
* as a whole. Node type is {@link Token#SCRIPT}.
*
* Note that the tree itself does not store errors. To collect the parse errors
* and warnings, pass an {@link org.mozilla.javascript.ErrorReporter} to the
* {@link org.mozilla.javascript.Parser} via the
* {@link org.mozilla.javascript.CompilerEnvirons}.
*/
public class AstRoot extends ScriptNode {
private SortedSet comments;
{
type = Token.SCRIPT;
}
public AstRoot() {
}
public AstRoot(int pos) {
super(pos);
}
/**
* Returns comment set
* @return comment set, sorted by start position. Can be {@code null}.
*/
public SortedSet getComments() {
return comments;
}
/**
* Sets comment list, and updates the parent of each entry to point
* to this node. Replaces any existing comments.
* @param comments comment list. can be {@code null}.
*/
public void setComments(SortedSet comments) {
if (comments == null) {
this.comments = null;
} else {
if (this.comments != null)
this.comments.clear();
for (Comment c : comments)
addComment(c);
}
}
/**
* Add a comment to the comment set.
* @param comment the comment node.
* @throws IllegalArgumentException if comment is {@code null}
*/
public void addComment(Comment comment) {
assertNotNull(comment);
if (comments == null) {
comments = new TreeSet(new AstNode.PositionComparator());
}
comments.add(comment);
comment.setParent(this);
}
/**
* Visits the comment nodes in the order they appear in the source code.
* The comments are not visited by the {@link #visit} function - you must
* use this function to visit them.
* @param visitor the callback object. It is passed each comment node.
* The return value is ignored.
*/
public void visitComments(NodeVisitor visitor) {
if (comments != null) {
for (Comment c : comments) {
visitor.visit(c);
}
}
}
/**
* Visits the AST nodes, then the comment nodes.
* This method is equivalent to calling {@link #visit}, then
* {@link #visitComments}. The return value
* is ignored while visiting comment nodes.
* @param visitor the callback object.
*/
public void visitAll(NodeVisitor visitor) {
visit(visitor);
visitComments(visitor);
}
@Override
public String toSource(int depth) {
StringBuilder sb = new StringBuilder();
for (Node node : this) {
sb.append(((AstNode)node).toSource(depth));
}
return sb.toString();
}
/**
* A debug-printer that includes comments (at the end).
*/
@Override
public String debugPrint() {
DebugPrintVisitor dpv = new DebugPrintVisitor(new StringBuilder(1000));
visitAll(dpv);
return dpv.toString();
}
/**
* Debugging function to check that the parser has set the parent
* link for every node in the tree.
* @throws IllegalStateException if a parent link is missing
*/
public void checkParentLinks() {
this.visit(new NodeVisitor() {
public boolean visit(AstNode node) {
int type = node.getType();
if (type == Token.SCRIPT)
return true;
if (node.getParent() == null)
throw new IllegalStateException
("No parent for node: " + node
+ "\n" + node.toSource(0));
return true;
}
});
}
}