/*
* Copyright 2012 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.template.soy.parsepasses;
import com.google.template.soy.exprtree.AbstractExprNodeVisitor;
import com.google.template.soy.exprtree.BooleanNode;
import com.google.template.soy.exprtree.ExprNode;
import com.google.template.soy.exprtree.ExprNode.ParentExprNode;
import com.google.template.soy.exprtree.FunctionNode;
import com.google.template.soy.soytree.SoyFileSetNode;
import com.google.template.soy.soytree.SoytreeUtils;
/**
* Visitor for replacing hasData() function with boolean 'true'.
*
* <p> Important: Do not use outside of Soy code (treat as superpackage-private).
*
* <p> Note: hasData() is a no-op as of March 2012, but we don't report an error yet because there
* are many existing usages.
*
* @author Kai Huang
*/
public class ReplaceHasDataFunctionVisitor {
/**
* Runs this pass on the given Soy tree.
*/
public void exec(SoyFileSetNode soyTree) {
SoytreeUtils.execOnAllV2Exprs(soyTree, new ReplaceHasDataFunctionInExprVisitor());
}
/**
* Private helper class for ReplaceHasDataFunctionVisitor to visit expressions.
* This class does the real work.
*/
private static class ReplaceHasDataFunctionInExprVisitor extends AbstractExprNodeVisitor<Void> {
@Override protected void visitFunctionNode(FunctionNode node) {
if (node.getFunctionName().equals("hasData")) {
node.getParent().replaceChild(node, new BooleanNode(true));
}
}
@Override protected void visitExprNode(ExprNode node) {
if (node instanceof ParentExprNode) {
visitChildrenAllowingConcurrentModification((ParentExprNode) node);
}
}
}
}