Composite blocktypes: Basic functionality

[rhazn]

From https://github.com/jvalue/jayvee/tree/main/rfc/0008-builtin-blocktypes

Reference #217, out of scope for this PR:

• model validation hints concerning composite blocks
• unit tests
• autogenerated docs
• adding a GTFS/CSV composite block into the stdlib

File with composite blocks to test

composite blocktype TextFileExtractor {
    property url oftype text;

    input inputName oftype None;
    output outputName oftype File;

    block FileExtractor oftype HttpExtractor { url: url; }

	block FileTextInterpreter oftype TextFileInterpreter {}

    inputName
        ->FileExtractor
        ->FileTextInterpreter
        ->outputName;
}

composite blocktype CSVExtractor {
    property url oftype text;
    property delimiter oftype text: ',';
    property enclosing oftype text: '';
    property enclosingEscape oftype text: '';

    input inputName oftype None;
    output outputName oftype Sheet;

    block TextFileExtractor oftype TextFileExtractor { url: url; }

	block FileCSVInterpreter oftype CSVInterpreter {
		delimiter: delimiter;
		enclosing: enclosing;
		enclosingEscape: enclosingEscape;
	}

    inputName
        ->TextFileExtractor
        ->FileCSVInterpreter
        ->outputName;
}

composite blocktype CarsTableInterpreterForTesting {
	input inputName oftype Sheet;
    output outputName oftype Table;

	block CarsTableInterpreter oftype TableInterpreter {
		header: true;
		columns: [
			"name" oftype text,
			"mpg" oftype decimal,
			"cyl" oftype integer,
			"disp" oftype decimal,
			"hp" oftype integer,
			"drat" oftype decimal,
			"wt" oftype decimal,
			"qsec" oftype decimal,
			"vs" oftype integer,
			"am" oftype integer,
			"gear" oftype integer,
			"carb" oftype integer
		];
	}

	inputName->CarsTableInterpreter->outputName;
}

composite blocktype SinkTester {
	input inputName oftype Table;
    output outputName oftype None;

	block CarsLoader oftype SQLiteLoader {
		table: "Cars";
		file: "./compositeblockstest.sqlite";
	}

	inputName->CarsLoader->outputName;
}

pipeline CarsPipeline {
	CarsCSVExtractor 
	   	-> TestCompositeWithInput
		-> CarsLoader;

    block CarsCSVExtractor oftype CSVExtractor {
        url: "https://gist.githubusercontent.com/noamross/e5d3e859aa0c794be10b/raw/b999fb4425b54c63cab088c0ce2c0d6ce961a563/cars.csv";
		enclosing: '"';
    }

	block TestCompositeWithInput oftype CarsTableInterpreterForTesting {
	}

	block CarsLoader oftype SinkTester {
	}
}

For testing, using e.g., the above source code:

npm run generate && npm run build && node dist/apps/interpreter/main.js example/composite-block.jv

[georg-schwarz]

Awesome! Looks quite intuitive after the refactor to me :)

I left a few very nitpicky comments. Feel free to ignore them as most of them are quite opinionated I guess ;-)