Unsupported statement

[manticore-projects]

Implement Unsupported statement, which will return any unparsable statement or fragment as a list of tokens.

This Feature is OFF by default and can be activated on demand:

        String sqlStr = "this is an unsupported statement";

        assertSqlCanBeParsedAndDeparsed(sqlStr, true, parser -> parser.withUnsupportedStatements(true) );

        Assertions.assertThrowsExactly(JSQLParserException.class, new Executable() {
            @Override
            public void execute() throws Throwable {
                CCJSqlParserUtil.parse(sqlStr, parser -> parser.withUnsupportedStatements(false) );
            }
        });

However, there are 2 caveats:

1. It does not work within BEGIN ... END blocks (because its hard to distinguish the END token from an Unsupported Statement
2. It is always ACTIVE for the Statements() production since the needed LOOKAHEAD does not work, but results in a stack overflow (maybe a JavaCC bug)

Also IF ... ELSE ... has not been considered yet. I do not think, it is relevant.

Fixes #1510

[wumpz]

However, I will merge. I find the idea of parsing without exceptions very attractive. :)

[wumpz]

To be honest I find your version much harder to read.

[vkostyukov]

I like this. Any idea when this is going to be released?

[wumpz]

At the moment I am deploying a new SNAPSHOT version. To be honest releasing this was not yet a plan, since version 4.4 was released recently.