Expression parsing

[hexus]

Tasks

• [x] Field value expressions
• [ ] Field property expressions

Expression candidates

• https://github.com/silentmatt/expr-eval
• https://github.com/soney/jsep
  • https://github.com/donmccurdy/expression-eval
• https://github.com/josdejong/mathjs

JSON query candidates

• https://github.com/jsonata-js/jsonata
  • https://docs.jsonata.org/predicate#wildcards
• https://github.com/jmespath/jmespath.js
  • http://jmespath.org/tutorial.html
• https://github.com/jsqry/jsqry

[hexus]

Expression parsing is in. :+1: expr-eval is awesome.

JSON querying might be a step to far for a project like this, but it could be provided to expressions as contextual function.

[hexus]

It would also be great to allow expressions for field properties other than the value.

This could be tricky though, because some field properties can be strings and we want this to be consistent without bloating form definitions.

[hexus]

Update to 2.x; array indexing!

https://github.com/silentmatt/expr-eval/blob/4aaff4f/CHANGELOG.md#202---2019-09-28