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add getChildren() method to Tree.

This commit is contained in:
Terence Parr 2013-09-10 17:34:24 -07:00
parent d505a393ef
commit 00fa2c7617
3 changed files with 20 additions and 1 deletions
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8
runtime/Java/src/org/antlr/v4/runtime/RuleContext.java
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@ -34,6 +34,7 @@ import org.antlr.v4.runtime.misc.Nullable;
import org.antlr.v4.runtime.tree.ParseTree;
import org.antlr.v4.runtime.tree.ParseTreeVisitor;
import org.antlr.v4.runtime.tree.RuleNode;
import org.antlr.v4.runtime.tree.Tree;
import org.antlr.v4.runtime.tree.Trees;
import org.antlr.v4.runtime.tree.gui.TreeViewer;
@ -59,7 +60,7 @@ import java.util.concurrent.Future;
* getting error information.
*
* These objects are used during parsing and prediction.
* For the special case of parsers and tree parsers, we use the subclass
* For the special case of parsers, we use the subclass
* ParserRuleContext.
*
* @see ParserRuleContext
@ -150,6 +151,11 @@ public class RuleContext implements RuleNode {
return 0;
}
@Override
public List<? extends Tree> getChildren() {
return null;
}
@Override
public <T> T accept(ParseTreeVisitor<? extends T> visitor) { return visitor.visitChildren(this); }

7
runtime/Java/src/org/antlr/v4/runtime/tree/TerminalNodeImpl.java
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@ -34,6 +34,8 @@ import org.antlr.v4.runtime.Parser;
import org.antlr.v4.runtime.Token;
import org.antlr.v4.runtime.misc.Interval;
import java.util.List;
public class TerminalNodeImpl implements TerminalNode {
public Token symbol;
public ParseTree parent;
@ -63,6 +65,11 @@ public class TerminalNodeImpl implements TerminalNode {
@Override
public int getChildCount() { return 0; }
@Override
public List<? extends Tree> getChildren() {
return null;
}
@Override
public <T> T accept(ParseTreeVisitor<? extends T> visitor) {
return visitor.visitTerminal(this);

6
runtime/Java/src/org/antlr/v4/runtime/tree/Tree.java
View File

@ -33,6 +33,9 @@ package org.antlr.v4.runtime.tree;
import org.antlr.v4.runtime.RuleContext;
import org.antlr.v4.runtime.Token;
import java.util.Collection;
import java.util.List;
/** The basic notion of a tree has a parent, a payload, and a list of children.
* It is the most abstract interface for all the trees used by ANTLR.
*/
@ -59,6 +62,9 @@ public interface Tree {
*/
int getChildCount();
/** Return ordered list of all children of this node */
List<? extends Tree> getChildren();
/** Print out a whole tree, not just a node, in LISP format
* {@code (root child1 .. childN)}. Print just a node if this is a leaf.
*/