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json.Parser should throw an error when useMapping = false and key "default" is encountered #561

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HT154 opened this issue Jun 29, 2024 · 2 comments · May be fixed by #700
Open

json.Parser should throw an error when useMapping = false and key "default" is encountered #561

HT154 opened this issue Jun 29, 2024 · 2 comments · May be fixed by #700
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bug Something isn't working good first issue Good for newcomers

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@HT154
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HT154 commented Jun 29, 2024 •
edited
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The behavior as-is is very surprising! Check this out:

import "pkl:json"

hidden jsonString = """
  {
    "hello": "world",
    "default": "greeting"
  }
  """

asDynamic = new json.Parser {}.parse(jsonString)
asMapping = new json.Parser { useMapping = true }.parse(jsonString)

Result:

asDynamic {
  hello = "world"
}
asMapping {
  ["hello"] = "world"
  ["default"] = "greeting"
}

I think throwing an error (or at least some kind of warning) here instead of returning unexpected results is desirable. Something like "encountered object key default when parsing JSON, resulting Dynamic will be incomplete or invalid" might make sense.

N.B.: Attempting to access the default yields further surprises:

asDynamicDefault = asDynamic.default

Result:

❯ pkl eval test.pkl
–– Pkl Error ––
Expected value of type `Function1`, but got type `String`.
Value: "greeting"

1741 | hidden default: (unknown) -> Any = (_) -> new Dynamic {}
                       ^^^^^^^^^^^^^^^^
at pkl.base#Dynamic.default (https://github.com/apple/pkl/blob/0.26.0/stdlib/base.pkl#L1741)

1 | 
    ^
at generated (source:unavailable)

11 | asDynamicDefault = asDynamic.default
                        ^^^^^^^^^^^^^^^^^
at test#asDynamicDefault (file:///.../test.pkl, line 11)

106 | text = renderer.renderDocument(value)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
at pkl.base#Module.output.text (https://github.com/apple/pkl/blob/0.26.0/stdlib/base.pkl#L106)
@HT154 HT154 changed the title pkl:json.Parser should throw an error when useMapping = false and key "default" is encountered json.Parser should throw an error when useMapping = false and key "default" is encountered Jun 30, 2024
@holzensp holzensp added bug Something isn't working good first issue Good for newcomers labels Jul 1, 2024
@bioball
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bioball commented Jul 3, 2024

Fair issue; seems like a good idea to throw here instead.

@lemonnn-8
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Hey, I can take this up.

HT154 added a commit to HT154/pkl that referenced this issue Oct 16, 2024
@HT154
Error when JSON/YAML parsing would set property default in a Dynamic
8a2b659 
Resolves apple#561
@HT154 HT154 linked a pull request Oct 16, 2024 that will close this issue
Open
HT154 added a commit to HT154/pkl that referenced this issue Oct 16, 2024
@HT154
Error when JSON/YAML parsing would set property default in a Dynamic
109101e 
Resolves apple#561
HT154 added a commit to HT154/pkl that referenced this issue Oct 17, 2024
@HT154
Error when JSON/YAML parsing would set property default in a Dynamic
ea57d3b 
Resolves apple#561
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Error when JSON/YAML parsing would set property default in a Dynamic HT154/pkl
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@HT154 @holzensp @bioball @lemonnn-8