json-filter

[streamich]

• Implement JSON filtering language: given a filter specification in JSON and a JSON document, the filter returns true or false.
• Return schema complexity estimate at compilation time? Complexity could be expressed as the number of JavaScript expressions.
• On schema evaluation, return the number of JavaScript expressions evaluated?
• Codegen for json-expression.
  • ExprGet
  • ExprEquals
  • ExprNotEquals
  • ExprIf
  • ExprAnd
  • ExprOr
  • ExprNot
  • ExprType
  • ExprBool
  • ExprNum
  • ExprInt
  • ExprStr
  • ExprStarts
  • ExprContains
  • ExprEnds
  • ExprDefined
  • ExprIn
  • ExprMatches
  • ExprCat
  • ExprSubstr
  • ExprLessThan
  • ExprLessThanOrEqual
  • ExprGreaterThan
  • ExprGreaterThanOrEqual
  • ExprBetweenNeNe
  • ExprBetweenNeEq
  • ExprBetweenEqNe
  • ExprBetweenEqEq
  • ExprMin
  • ExprMax
  • ExprPlus
  • ExprMinus
  • ExprAsterisk
  • ExprSlash
  • ExprMod
  • ExprRound
  • ExprCeil
  • ExprFloor
• Ability to provide default value for json-expression "get" operator if value not found.
• json-expression should throw on any undefined values? As undefined is not part of JSON and is unique to JavaScript.
• Implement benchmarks
  • codegen vs evaluator
  • vs JSON Logic
  • vs JSON patch
• Implement AWS SNS filtering rule compiler to json-expression
• Add README. Name it JSON Expression.

---

• See AWS SQS and AWS SNS filtering language for inspiration.
  • https://docs.aws.amazon.com/sns/latest/dg/sns-message-filtering.html
• Consider using JSON Predicate specification.
• Common Query Language (CQL)
  • https://portal.ogc.org/files/96288
• Consider JSON Logic
• Maybe JSON Schema and JSON Predicate are already good enough for filtering?
• It could be something like a List language in JSON.

---

It could be called json-expressions and implement basic expressions, like:

['and',
    ['starts', 'mu.bl/:posts-', ['get', '/req/id']],
    ['<', ['len', ['get', '/req/batch']], 5]
]
 
['add', '/tmp/userId', ['val', 'xxxxxxxx']]

['and',
    ['==',
    	'document-123',
     	['get', '/channel']],
    ['==',
     	'mousemove',
     	['get', '/data/type']],
    ['<',
     	123234343433,
     	['get', '/data/timestamp']],
    ['in', ['get', '/data/customer_interests'], [[
      "rugby",
      "football",
      "baseball"
   ]]]
]

Alternatively, a more advanced version of this could treat everything as function:

['map', [[1, 2, 3]], ['*', 2]] // [2, 4, 6]

[streamich]

🎉 This issue has been resolved in version 6.0.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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