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Parser

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type Parser[T] = (Value) -> T raise 
Invalid

A function that parses a Value into T.

Object

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type Object

An object together with the path used in error messages.

Object::field

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fn Object::field(self : Object, name : String) -> Value raise 
Invalid

Get a required field. Missing keys raise; JSON null is still a Value.

Object::optional_field

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fn Object::optional_field(self : Object, name : String) -> Value?

Get an optional field.

Returns None only when the key is absent. JSON null is Some(Value).

Value

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type Value

A JSON value together with the path used in error messages.

Value::array

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Convert this value to an array of Values.

Value::bool

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Convert this value to Bool.

Value::double

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Convert this value to Double.

JSON numbers that overflow to infinity are rejected.

Value::int

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Convert this value to Int.

JSON numbers must be finite integers in the 32-bit range.

Value::int64

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Convert this value to Int64.

JSON numbers must be finite integers in the 64-bit range.

Value::null

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fn Value::null(self : Value) -> Unit raise 
Invalid

Require this value to be JSON null.

Value::object

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Convert this value to an object.

Value::raw

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fn Value::raw(self : Value) -> Json

Return the underlying JSON. Use this as an escape hatch for types that maru does not convert directly.

Value::string

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Convert this value to String.

first_of

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fn[T] first_of(value : Value, parsers : Array[(Value) -> T raise 
Invalid]) -> T raise 
Invalid

Try each parser in order and return the first success.

Raises when every parser fails.

from_json

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fn from_json(json : Json) -> Value

Wrap JSON as a Value so it can be validated while a typed value is built.

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