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Liquibase is a tool for managing and executing database changes.

There is a newer version: 4.30.0

package liquibase.util;

import liquibase.exception.UnexpectedLiquibaseException;
import liquibase.parser.LiquibaseSqlParser;
import liquibase.util.grammar.*;

import java.io.StringReader;

public class StandardSqlParser implements LiquibaseSqlParser {
    @Override
    public StringClauses parse(String sqlBlock) {
        return parse(sqlBlock, false, false);
    }

    @Override
    public StringClauses parse(String sqlBlock, boolean preserveWhitespace, boolean preserveComments) {
        StringClauses clauses = new StringClauses(preserveWhitespace?"":" ");

        SimpleSqlGrammarTokenManager tokenManager = new SimpleSqlGrammarTokenManager(new SimpleCharStream(new StringReader(sqlBlock)));
        SimpleSqlGrammar t = new SimpleSqlGrammar(tokenManager);
        try {
            Token token = t.getNextToken();
            while (!"".equals(token.toString())) {
                if (token.kind == SimpleSqlGrammarConstants.WHITESPACE) {
                    if (preserveWhitespace) {
                        clauses.append(new StringClauses.Whitespace(token.image));
                    }
                } else if ((token.kind == SimpleSqlGrammarConstants.LINE_COMMENT) || (token.kind ==
                        SimpleSqlGrammarConstants.MULTI_LINE_COMMENT)) {
                    if (preserveComments) {
                        String comment = token.image;
                        if (!preserveWhitespace && (token.kind == SimpleSqlGrammarConstants.LINE_COMMENT)) {
                            if (!comment.endsWith("\n")) {
                                comment = comment + "\n";
                            }
                        }
                        clauses.append(new StringClauses.Comment(comment));
                    }
                } else {
                    clauses.append(token.image);
                }
                token = t.getNextToken();
            }

        } catch (Exception e) {
            throw new UnexpectedLiquibaseException(e);
        }
        return clauses;
    }

    @Override
    public int getPriority() {
        return PRIORITY_DEFAULT;
    }
}