/**
* 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.drill.common.expression.parser;
import java.io.File;
import org.antlr.runtime.ANTLRStringStream;
import org.antlr.runtime.CommonTokenStream;
import org.antlr.runtime.tree.CommonTree;
import org.antlr.runtime.tree.DOTTreeGenerator;
import org.antlr.stringtemplate.StringTemplate;
import org.apache.drill.common.config.DrillConfig;
import org.apache.drill.common.expression.FunctionRegistry;
import org.apache.drill.common.expression.LogicalExpression;
import org.apache.drill.common.expression.parser.ExprParser.parse_return;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.google.common.base.Charsets;
import com.google.common.io.Files;
public class TreeTest {
public static void main(String[] args) throws Exception {
ExprLexer lexer = new ExprLexer(
new ANTLRStringStream(
"if ($F1) then case when (_MAP.R_NAME = 'AFRICA') then 2 else 4 end else if(4==3) then 1 else if(x==3) then 7 else (if(2==1) then 6 else 4 end) end"));
// ExprLexer lexer = new ExprLexer(new
// ANTLRStringStream("if ('blue.red') then 'orange' else if (false) then 1 else 0 end"));
// ExprLexer lexer = new ExprLexer(new ANTLRStringStream("2+2"));
CommonTokenStream tokens = new CommonTokenStream(lexer);
ExprParser parser = new ExprParser(tokens);
parser.setRegistry(new FunctionRegistry(DrillConfig.create()));
parse_return ret = parser.parse();
LogicalExpression e = ret.e;
ObjectMapper mapper = new ObjectMapper();
mapper.enable(SerializationFeature.INDENT_OUTPUT);
System.out.println(mapper.writeValueAsString(e));
// print the tree
CommonTree tree = (CommonTree) ret.getTree();
DOTTreeGenerator gen = new DOTTreeGenerator();
StringTemplate st = gen.toDOT(tree);
Files.write(st.toString(), new File("/Users/jnadeau/Documents/tree.dot"), Charsets.UTF_8);
}
}