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Kripton SQLite Test Library

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/*******************************************************************************
 * Copyright 2015, 2017 Francesco Benincasa ([email protected]).
 *
 * 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.abubusoft.kripton.android.sqlite.internals;

import org.antlr.v4.runtime.CharStreams;
import org.antlr.v4.runtime.CommonTokenStream;
import org.antlr.v4.runtime.ParserRuleContext;
import org.antlr.v4.runtime.RecognitionException;
import org.antlr.v4.runtime.Recognizer;
import org.antlr.v4.runtime.tree.ParseTreeWalker;

import com.abubusoft.kripton.android.sqlite.AssertKripton;
import com.abubusoft.kripton.common.Pair;
import com.abubusoft.kripton.processor.sqlite.grammars.jsql.JqlBaseListener;
import com.abubusoft.kripton.processor.sqlite.grammars.jsql.JqlLexer;
import com.abubusoft.kripton.processor.sqlite.grammars.jsql.JqlParser;

public class MigrationSQLChecker {

	protected static MigrationSQLChecker instance;

	public static final MigrationSQLChecker getInstance() {
		if (instance == null) {
			instance = new MigrationSQLChecker();
		}

		return instance;
	}

	ParseTreeWalker walker = new ParseTreeWalker();

	private MigrationSQLChecker() {

	}

	protected  void analyzeInternal(final String jql, L listener) {
		walker.walk(listener, prepareParser(jql).value0);
	}

	public  void analyze(final String sql, L listener) {
		analyzeInternal(sql, listener);
	}

	protected Pair prepareParser(final String jql) {
		JqlLexer lexer = new JqlLexer(CharStreams.fromString(jql));
		CommonTokenStream tokens = new CommonTokenStream(lexer);
		JqlParser parser = new JqlParser(tokens);

		parser.removeErrorListeners();
		parser.addErrorListener(new JQLBaseErrorListener() {
			@Override
			public void syntaxError(Recognizer recognizer, Object offendingSymbol, int line,
					int charPositionInLine, String msg, RecognitionException e) {
				AssertKripton.assertTrue(false, "unespected char at pos %s of SQL '%s'", charPositionInLine, jql);
			}
		});

		ParserRuleContext context = parser.parse();
		return new Pair<>(context, tokens);
	}

}