SAPHANAParser.java

/*-
 * ========================LICENSE_START=================================
 * flyway-database-saphana
 * ========================================================================
 * Copyright (C) 2010 - 2025 Red Gate Software Ltd
 * ========================================================================
 * 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.
 * =========================LICENSE_END==================================
 */
package org.flywaydb.database.saphana;

import org.flywaydb.core.api.configuration.Configuration;
import org.flywaydb.core.internal.parser.*;

import java.io.IOException;
import java.util.List;
import java.util.regex.Pattern;

public class SAPHANAParser extends Parser {
    private static final StatementType FUNCTION_OR_PROCEDURE_STATEMENT = new StatementType();
    private static final Pattern FUNCTION_OR_PROCEDURE_REGEX = Pattern.compile(
            "^CREATE(\\sOR\\sREPLACE)?\\s(FUNCTION|PROCEDURE)");

    private static final StatementType ANONYMOUS_BLOCK_STATEMENT = new StatementType();
    private static final Pattern ANONYMOUS_BLOCK_REGEX = Pattern.compile(
            "^DO.*BEGIN");

    public SAPHANAParser(Configuration configuration, ParsingContext parsingContext) {
        super(configuration, parsingContext, 2);
    }

    @Override
    protected StatementType detectStatementType(String simplifiedStatement, ParserContext context, PeekingReader reader) {
        if (FUNCTION_OR_PROCEDURE_REGEX.matcher(simplifiedStatement).matches()) {
            return FUNCTION_OR_PROCEDURE_STATEMENT;
        }
        if (ANONYMOUS_BLOCK_REGEX.matcher(simplifiedStatement).matches()) {
            return ANONYMOUS_BLOCK_STATEMENT;
        }

        return super.detectStatementType(simplifiedStatement, context, reader);
    }

    @Override
    protected boolean shouldAdjustBlockDepth(ParserContext context, List<Token> tokens, Token token) {
        TokenType tokenType = token.getType();
        if ((context.getStatementType() == FUNCTION_OR_PROCEDURE_STATEMENT || context.getStatementType() == ANONYMOUS_BLOCK_STATEMENT) &&
                (TokenType.EOF == tokenType || TokenType.DELIMITER == tokenType)) {
            return true;
        }

        return super.shouldAdjustBlockDepth(context, tokens, token);
    }

    @Override
    protected void adjustBlockDepth(ParserContext context, List<Token> tokens, Token keyword, PeekingReader reader) throws IOException {
        int parensDepth = keyword.getParensDepth();

        // BEGIN, CASE, DO and IF increases block depth
        if ("BEGIN".equals(keyword.getText()) || "CASE".equals(keyword.getText()) || "DO".equals(keyword.getText()) || "IF".equals(keyword.getText())
                // But not END IF
                && !Parser.lastTokenIs(tokens, parensDepth, "END")) {
            context.increaseBlockDepth(keyword.getText());
        } else if (doTokensMatchPattern(tokens, keyword, FUNCTION_OR_PROCEDURE_REGEX)) {
            context.increaseBlockDepth("FUNCTION_OR_PROCEDURE_REGEX");
        } else if ("END".equals(keyword.getText())) {
            context.decreaseBlockDepth();
        }

        TokenType tokenType = keyword.getType();
        if ((context.getStatementType() == FUNCTION_OR_PROCEDURE_STATEMENT || context.getStatementType() == ANONYMOUS_BLOCK_STATEMENT) &&
                (TokenType.EOF == tokenType || TokenType.DELIMITER == tokenType) &&
                context.getBlockDepth() == 1 &&
                Parser.lastTokenIs(tokens, parensDepth, "END")) {
            context.decreaseBlockDepth();
            return;
        }
    }
}