| /* |
| * 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.test; |
| |
| import java.io.IOException; |
| import java.io.Reader; |
| import java.io.StringReader; |
| |
| /** |
| * Very simple parser for semi-colon separated lists of SQL statements which |
| * handles quoted semicolons. Drill can execute only one statement at a time |
| * (without a trailing semi-colon.) This parser breaks up a statement list |
| * into single statements. Input:<code><pre> |
| * USE a.b; |
| * ALTER SESSION SET `foo` = ";"; |
| * SELECT * FROM bar WHERE x = "\";"; |
| * </pre><code>Output: |
| * <ul> |
| * <li><tt>USE a.b</tt></li> |
| * <li><tt>ALTER SESSION SET `foo` = ";"</tt></li> |
| * <li><tt>SELECT * FROM bar WHERE x = "\";"</tt></li> |
| */ |
| public class StatementParser { |
| private final Reader in; |
| |
| public StatementParser(Reader in) { |
| this.in = in; |
| } |
| |
| public StatementParser(String text) { |
| this(new StringReader(text)); |
| } |
| |
| public String parseNext() throws IOException { |
| boolean eof = false; |
| StringBuilder buf = new StringBuilder(); |
| while (true) { |
| int c = in.read(); |
| if (c == -1) { |
| eof = true; |
| break; |
| } |
| if (c == ';') { |
| break; |
| } |
| buf.append((char) c); |
| if (c == '"' || c == '\'' || c == '`') { |
| int quote = c; |
| boolean escape = false; |
| while (true) { |
| c = in.read(); |
| if (c == -1) { |
| throw new IllegalArgumentException("Mismatched quote: " + (char) c); |
| } |
| buf.append((char) c); |
| if (! escape && c == quote) { |
| break; |
| } |
| escape = c == '\\'; |
| } |
| } |
| } |
| String stmt = buf.toString().trim(); |
| if (stmt.isEmpty() && eof) { |
| return null; |
| } |
| return stmt; |
| } |
| } |