predicates in json-ld don't work

[pebbe]

jsonata version 2.1.0

json-ld has field names that start with @
jsonata doesn't handle this in predicates

source:

{
  "name": [
    {
      "@value": "Computationele Taalkunde, Faculteit der Letteren, Rijksuniversiteit Groningen",
      "@language": "nl"
    },
    {
      "@value": "Computational Linguistics, Faculty of Arts, Groningen University",
      "@language": "en"
    }
  ]
}

query:

name

output OK:

[
  {
    "@value": "Computationele Taalkunde, Faculteit der Letteren, Rijksuniversiteit Groningen",
    "@language": "nl"
  },
  {
    "@value": "Computational Linguistics, Faculty of Arts, Groningen University",
    "@language": "en"
  }
]

query:

name."@language"

output OK:

[
  "nl",
  "en"
]

query:

name["@language"="nl"]

output wrong:

undefined

expected output:

{
  "@value": "Computationele Taalkunde, Faculteit der Letteren, Rijksuniversiteit Groningen",
  "@language": "nl"
}

[markmelville]

the proper escape sequence is the backtick, so this gives you what you're looking for:

name[`@language`="nl"]

[pebbe]

the proper escape sequence is the backtick, so this gives you what you're looking for:

name[`@language`="nl"]

Yes, that works.

Why don't I need backticks in name."@language" ?

[markmelville]

This is my gut feeling without diving in to read the code. Each operator expects a certain type of operand.

• pathing expects what I'll call a "selector", so name.<selector>
• filtering expects a boolean, and the boolean-providing equality compare takes anything: name[ <lhs>=<rhs> ]

When you give a string as a path selector, it can interpret that as a selector to mean the same as "a property with name equal to the value of the string".
When you give the string in the filter, it can't safely infer that the string should be coerced to a selector before performing the equality, so it can only do the comparison on the string literal: does string "@language" equal string "nl"? false