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/*
* SonarQube Python Plugin
* Copyright (C) 2011-2018 SonarSource SA
* mailto:info AT sonarsource DOT com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.sonar.python;
import com.sonar.sslr.api.AstNode;
import com.sonar.sslr.api.AstNodeType;
import com.sonar.sslr.api.Token;
import java.util.Collections;
import java.util.List;
import java.util.Set;
public class PythonVisitor {
private PythonVisitorContext context;
public Set<AstNodeType> subscribedKinds() {
return Collections.emptySet();
}
public void visitFile(AstNode node) {
// default implementation does nothing
}
public void leaveFile(AstNode node) {
// default implementation does nothing
}
public void visitNode(AstNode node) {
// default implementation does nothing
}
public void visitToken(Token token) {
// default implementation does nothing
}
public void leaveNode(AstNode node) {
// default implementation does nothing
}
public PythonVisitorContext getContext() {
return context;
}
public void scanFile(PythonVisitorContext context) {
this.context = context;
AstNode tree = context.rootTree();
if (tree != null) {
visitFile(tree);
scanNode(tree, subscribedKinds());
leaveFile(tree);
}
}
public void scanNode(AstNode node) {
scanNode(node, subscribedKinds());
}
private void scanNode(AstNode node, Set<AstNodeType> subscribedKinds) {
boolean isSubscribedType = subscribedKinds.contains(node.getType());
if (isSubscribedType) {
visitNode(node);
}
List<AstNode> children = node.getChildren();
if (children.isEmpty()) {
for (Token token : node.getTokens()) {
visitToken(token);
}
} else {
for (AstNode child : children) {
scanNode(child, subscribedKinds);
}
}
if (isSubscribedType) {
leaveNode(node);
}
}
}