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// Copyright 2014 Google Inc. All rights reserved.
//
// 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.devtools.build.lib.syntax;
import com.google.devtools.build.lib.syntax.DictionaryLiteral.DictionaryEntryLiteral;
import com.google.devtools.build.lib.syntax.IfStatement.ConditionalStatements;
import java.util.List;
/**
* A visitor for visiting the nodes in the syntax tree left to right, top to
* bottom.
*/
public class SyntaxTreeVisitor {
public void visit(ASTNode node) {
// dispatch to the node specific method
node.accept(this);
}
public void visitAll(List<? extends ASTNode> nodes) {
for (ASTNode node : nodes) {
visit(node);
}
}
// node specific visit methods
public void visit(Argument.Passed node) {
visit(node.getValue());
}
public void visit(Parameter node) {
// leaf node (we need the function for overrides)
}
public void visit(BuildFileAST node) {
visitAll(node.getStatements());
visitAll(node.getComments());
}
public void visit(BinaryOperatorExpression node) {
visit(node.getLhs());
visit(node.getRhs());
}
public void visit(FuncallExpression node) {
visit(node.getFunction());
visitAll(node.getArguments());
}
public void visit(Identifier node) {
}
public void visit(ListComprehension node) {
visit(node.getElementExpression());
for (ListComprehension.Clause clause : node.getClauses()) {
if (clause.getLValue() != null) {
visit(clause.getLValue().getExpression());
}
visit(clause.getExpression());
}
}
public void accept(DictComprehension node) {
visit(node.getKeyExpression());
visit(node.getValueExpression());
visit(node.getLoopVar().getExpression());
visit(node.getListExpression());
}
public void visit(LoadStatement node) {
visitAll(node.getSymbols());
}
public void visit(ListLiteral node) {
visitAll(node.getElements());
}
public void visit(IntegerLiteral node) {
}
public void visit(StringLiteral node) {
}
public void visit(AssignmentStatement node) {
visit(node.getLValue().getExpression());
visit(node.getExpression());
}
public void visit(ExpressionStatement node) {
visit(node.getExpression());
}
public void visit(IfStatement node) {
visitAll(node.getThenBlocks());
visitAll(node.getElseBlock());
}
public void visit(ConditionalStatements node) {
visit(node.getCondition());
visitAll(node.getStmts());
}
public void visit(FunctionDefStatement node) {
visit(node.getIdent());
List<Expression> defaults = node.getSignature().getDefaultValues();
if (defaults != null) {
visitAll(defaults);
}
visitAll(node.getStatements());
}
public void visit(ReturnStatement node) {
visit(node.getReturnExpression());
}
public void visit(DictionaryLiteral node) {
visitAll(node.getEntries());
}
public void visit(DictionaryEntryLiteral node) {
visit(node.getKey());
visit(node.getValue());
}
public void visit(NotExpression node) {
visit(node.getExpression());
}
public void visit(Comment node) {
}
public void visit(ConditionalExpression node) {
visit(node.getThenCase());
visit(node.getCondition());
if (node.getElseCase() != null) {
visit(node.getElseCase());
}
}
}
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