/*
* Copyright 2008 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.common.base.Preconditions;
import com.google.common.collect.Maps;
import com.google.template.soy.base.SoySyntaxException;
import com.google.template.soy.soytree.AbstractSoyNodeVisitor;
import com.google.template.soy.soytree.SoyFileNode;
import com.google.template.soy.soytree.SoyFileSetNode;
import com.google.template.soy.soytree.TemplateNode;
import java.util.Map;
/**
* Visitor for processing overrides.
*
* <p> Important: Do not use outside of Soy code (treat as superpackage-private).
*
* <p> Overrides are only allowed in Soy V1. An override is a template with the same name as an
* earlier template, intended to replace the earlier definition.
*
* <p> {@link #exec} should be called on a full parse tree. This visitor will check that all
* overrides are explicit. There is no return value. A {@code SoySyntaxException} is thrown if a
* non-explicit override is found.
*
* <p> Precondition: All the template names in {@code TemplateNode}s must be full names (i.e. you
* must execute {@link PrependNamespacesVisitor} before executing this visitor).
*
* @author Kai Huang
*/
public class CheckOverridesVisitor extends AbstractSoyNodeVisitor<Void> {
/** Map of template name to template node for templates seen so far. */
private Map<String, TemplateNode> templateMap;
@Override protected void setup() {
templateMap = Maps.newHashMap();
}
// -----------------------------------------------------------------------------------------------
// Implementations for concrete classes.
/**
* {@inheritDoc}
* @throws SoySyntaxException If a non-explicit override is found.
*/
@Override protected void visitInternal(SoyFileSetNode node) {
visitChildren(node);
}
/**
* {@inheritDoc}
* @throws SoySyntaxException If a non-explicit override is found.
*/
@Override protected void visitInternal(SoyFileNode node) {
visitChildren(node);
}
/**
* {@inheritDoc}
* @throws SoySyntaxException If a non-explicit override is found.
*/
@Override protected void visitInternal(TemplateNode node) {
String templateName = node.getTemplateName();
// Template name should be full name (not start with '.').
Preconditions.checkArgument(templateName.charAt(0) != '.');
if (templateMap.containsKey(templateName)) {
TemplateNode prevTemplate = templateMap.get(templateName);
// If this duplicate definition is not an explicit Soy V1 override, report error.
if (!node.isOverride()) {
String prevTemplateFilePath =
prevTemplate.getNearestAncestor(SoyFileNode.class).getFilePath();
String currTemplateFilePath = node.getNearestAncestor(SoyFileNode.class).getFilePath();
if (currTemplateFilePath.equals(prevTemplateFilePath)) {
throw new SoySyntaxException(
"Found two definitions for template name '" + templateName + "', both in the file " +
currTemplateFilePath + ".");
} else {
throw new SoySyntaxException(
"Found two definitions for template name '" + templateName +
"' in two different files " + prevTemplateFilePath + " and " +
currTemplateFilePath + ".");
}
}
} else {
templateMap.put(templateName, node);
}
}
}
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