PropertiesRenderer0.27.0

Overview
Properties
Methods

class PropertiesRenderer extends ValueRenderer

Known subtypes:
Known usages:
All versions:

Pkl object properties and keys of type Boolean, String, Int, and Float are flattened into dot-separated Java property keys.

Pkl values of type Boolean, String, Int, and Float are rendered as Java property values.

To render Pkl values of other types, convert them to one of the above types with converters.

Example:

person {
  name = "Pigeon"
  age = 42
  hobbies = List("surfing", "fire making")
}

output {
  renderer = new PropertiesRenderer {
    converters {
      // render lists as comma-separated values
      [List] = (it) -> it.join(",")
    }
  }
}

The above example produces the following output:

person.name = Pigeon
person.age = 42
person.hobbies = surfing,fire making

Properties(show inherited)

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ValueRenderer.converters: Mapping<(Class|String), (unknown) -> Any> (pkl.base)

Value converters to apply before values are rendered.
A value converter is a function that converts a value to another value immediately before the value is rendered (and after the value has been type-checked). The converted value is then rendered by the renderer's hardwired rendering logic.

When a converter returns a value of type Object, Collection, Map, or Pair, converters are recursively applied to the returned value's components (object properties, list elements, etc.).

At most one converter is applied per value. If multiple converters are applicable, a winner is chosen as follows:
- A converter with String key wins over a converter with Class key.
- Between multiple String key converters, the converter defined earlier (according to the mapping's definition order) wins.
- Between multiple Class key converters, the most specific class (according to class hierarchy) wins.
A converter's key specifies which values the converter should be applied to. A converter with Class key is applied to values of that class, including values of its subclasses. A converter with String key is applied to values whose path matches the path spec described by the string.

Path specs can have the following components:
- ^ matches the top-level value passed to renderDocument() or renderValue() (often the module object)
- pigeon matches property pigeon at any hierarchy level
- [pigeon] matches map(ping) entry with String key "pigeon" at any hierarchy level
- * matches any property
- [*] matches any list(ing) element or map(ping) entry
Here are some examples of valid property paths:
- "server"
- "server.timeout"
- "^server.timeout" (matches server.timeout, but not racks[12345].server.timeout)
- "racks[12345].server"
- "racks[*].server
Paths are matched against path specs component-wise in reverse order. For example, paths server.timeout and racks[*].server.timeout both match path spec server.timeout, whereas path server.timeout.millis does not.
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ValueRenderer.extension: String? (pkl.base)

The file extension associated with this output format, or null if this format does not have an extension.
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omitNullProperties: Boolean

Whether to skip rendering properties whose value is null.
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restrictCharset: Boolean

Whether to render characters outside the printable US-ASCII charset range as Unicode escapes.

Methods(show inherited)

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function

Any.getClass(): Class (pkl.base)

Returns the class of this.
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function

Any.toString(): String (pkl.base)

Returns a string representation of this.

This method is used to convert the values of string interpolation expressions to strings.
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function

Any.ifNonNull<Result>(transform: (NonNull) -> Result): Result? (pkl.base)

Returns this |> transform if this is non-null, and null otherwise.

This method is the complement of the ?? operator and the equivalent of an Option type's map and flatMap methods.
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function

Typed.hasProperty(name: String): Boolean (pkl.base)

Tells if this object has a property with the given name.
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function

Typed.getProperty(name: String): unknown (pkl.base)

Returns the value of the property with the given name.

Throws if a property with this name does not exist.
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Typed.getPropertyOrNull(name: String): unknown? (pkl.base)

Returns the value of the property with the given name.

Returns null if a property with this name does not exist.
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Typed.toDynamic(): Dynamic (pkl.base)

Converts this object to a Dynamic object.
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function

Typed.toMap(): Map<String, unknown> (pkl.base)

Converts this object to a Map.
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function

renderDocument(value: Any): String

Renders value as a complete document.

Some renderers impose restrictions on which types of values can be rendered as document.

A typical implementation of this method renders a document header/footer and otherwise delegates to renderValue().
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function

renderValue(value: Any): String

Renders value.