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NEWSKQL - New Schneider Kalf Questionnaire Language

DSL for Questionnaire Language

Demo

Feel free to try out the DSL editor on the demo website:

http://sp.schneider.click/

So far it only outputs the given questionnaire to a JSON textarea.

Development

Requirements:

Install dependencies:

Only necessary if dependencies changed or first run.

yarn

Run development server:

yarn start

Visit http://localhost:3000

Generating a new parser

Requirements to generate parser

You need a global installation of pegjs to run the parser generator command below:

npm install -g pegjs

Run QL parser generator

After making changes to src/parsing/grammars/ql_grammar.pegts you can run the following command to generate a new parser:

npm run generate:ql

The results will be written to src/parsing/parsers/ql_parser.ts. If the development server is running it will automatically reload.

Tests

To run the tests inside src/test please execute:

yarn test

This will watch all files for changes and execute the tests every time a file is saved. You maybe have to press a initially to run all tests.

Build for production

yarn build

Result will be written into the /build folder

Doubts

  • Can we have escape characters in string "?

  • Are comments allowed (and which comments?)?

  • Are new lines required by the syntax?

  • Double and single string support?

  • What's the date format?

  • What's the money format?

  • Or just call everything Literal (as JS does)?

  • support multiple minuses --3 (python does)?

  • (FIXED) minus numbers

  • (FIXED) unary !

  • TODO: Replace this simple integer check with solution in parser, differentiate between 10 and 10.0 (See type check visitor visitNumberLiteral)

  • TODO: Allow money and date literal (See type check visitor visitNumberLiteral)

  • TODO: Allow float literals (5.1 and 5.0)

  • TODO: money = (50 + 10) results in Addition(NumberLiteral(5), NumberLiteral(10))

  • TODO: Every character of changed field is in state (Maybe kill state when form changes?)

  • TODO: Divide money by money transformed to float

  • TODO: SellingPrice: boolean = (1 / 10) is not a problem

  • TODO improve naming