| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.pig.parser; |
| |
| import java.io.IOException; |
| |
| import org.antlr.runtime.CharStream; |
| import org.antlr.runtime.CommonTokenStream; |
| import org.antlr.runtime.RecognitionException; |
| import org.antlr.runtime.tree.CommonTree; |
| import org.antlr.runtime.tree.CommonTreeNodeStream; |
| import org.antlr.runtime.tree.Tree; |
| import org.apache.pig.newplan.logical.relational.LogicalPlan; |
| |
| public class ParserTestingUtils { |
| public static CommonTokenStream tokenize(String query) throws IOException, ParsingFailureException { |
| CharStream input = new QueryParserStringStream( query, null ); |
| QueryLexer lexer = new QueryLexer( input ); |
| CommonTokenStream tokens = new CommonTokenStream( lexer ); |
| if( 0 < lexer.getNumberOfSyntaxErrors() ) |
| throw new ParsingFailureException( QueryLexer.class ); |
| return tokens; |
| } |
| |
| public static Tree parse(String query) throws IOException, RecognitionException, ParsingFailureException { |
| CommonTokenStream tokens = tokenize( query ); |
| QueryParser parser = QueryParserUtils.createParser( tokens ); |
| QueryParser.query_return result = parser.query(); |
| Tree ast = (Tree)result.getTree(); |
| TreePrinter.printTree( (CommonTree)ast, 0 ); |
| |
| if( 0 < parser.getNumberOfSyntaxErrors() ) |
| throw new ParsingFailureException( QueryParser.class ); |
| |
| return ast; |
| } |
| |
| public static Tree validateAst(String query) |
| throws RecognitionException, ParsingFailureException, IOException { |
| Tree ast = parse( query ); |
| CommonTreeNodeStream nodes = new CommonTreeNodeStream( ast ); |
| AstValidator walker = new AstValidator( nodes ); |
| AstValidator.query_return newResult = walker.query(); |
| Tree newAst = (Tree)newResult.getTree(); |
| TreePrinter.printTree( (CommonTree)newAst, 0 ); |
| |
| if( 0 < walker.getNumberOfSyntaxErrors() ) |
| throw new ParsingFailureException( AstValidator.class ); |
| |
| return newAst; |
| } |
| |
| public static LogicalPlan generateLogicalPlan(String query) |
| throws RecognitionException, ParsingFailureException, IOException { |
| Tree ast = validateAst( query ); |
| |
| CommonTreeNodeStream input = new CommonTreeNodeStream( ast ); |
| LogicalPlanBuilder builder = new LogicalPlanBuilder( input ); |
| LogicalPlanGenerator walker = new LogicalPlanGenerator( input, builder ); |
| walker.query(); |
| |
| if( 0 < walker.getNumberOfSyntaxErrors() ) |
| throw new ParsingFailureException( LogicalPlanGenerator.class ); |
| |
| LogicalPlan plan = walker.getLogicalPlan(); |
| System.out.println( "Generated logical plan: " + plan.toString() ); |
| |
| return plan; |
| } |
| |
| } |