Enum pot::Value

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pub enum Value<'a> {
    None,
    Unit,
    Bool(bool),
    Integer(Integer),
    Float(Float),
    Bytes(Cow<'a, [u8]>),
    String(Cow<'a, str>),
    Sequence(Vec<Self>),
    Mappings(Vec<(Self, Self)>),
}

Expand description

A Pot-encoded value. This type can be used to deserialize to and from Pot without knowing the original data structure.

Variants§

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None

A value representing None.

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Unit

A value representing unit (()).

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Bool(bool)

A boolean value

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Integer(Integer)

An integer value.

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Float(Float)

A floating point value.

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Bytes(Cow<'a, [u8]>)

A value containing arbitrary bytes.

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String(Cow<'a, str>)

A string value.

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Sequence(Vec<Self>)

A sequence of values.

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Mappings(Vec<(Self, Self)>)

A sequence of key-value mappings.

Implementations§

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impl<'a> Value<'a>

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pub fn from_serialize<T: Serialize>(value: T) -> Result<Self, ValueError>

Creates a Value from the given Serde-compatible type.

use pot::Value;
use serde_derive::Serialize;

#[derive(Serialize, Debug)]
enum Example {
    Hello,
    World,
}

let original = vec![Example::Hello, Example::World];
let serialized = Value::from_serialize(&original)?;
assert_eq!(
    serialized,
    Value::Sequence(vec![
        Value::from(String::from("Hello")),
        Value::from(String::from("World"))
    ])
);

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pub fn deserialize_as<'de, T: Deserialize<'de>>( &'de self, ) -> Result<T, ValueError>

Attempts to create an instance of T from this value.

use pot::Value;
use serde_derive::{Deserialize, Serialize};

#[derive(Serialize, Deserialize, Debug, Eq, PartialEq)]
enum Example {
    Hello,
    World,
}

let original = vec![Example::Hello, Example::World];
let serialized = Value::from_serialize(&original)?;
let deserialized: Vec<Example> = serialized.deserialize_as()?;
assert_eq!(deserialized, original);

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pub fn from_sequence<IntoIter: IntoIterator<Item = T>, T: Into<Self>>( sequence: IntoIter, ) -> Self

Returns a new value from an iterator of items that can be converted into a value.

let mappings = Value::from_sequence(Vec::<String>::new());
assert!(matches!(mappings, Value::Sequence(_)));

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pub fn from_mappings<IntoIter: IntoIterator<Item = (K, V)>, K: Into<Self>, V: Into<Self>>( mappings: IntoIter, ) -> Self

Returns a new value from an iterator of 2-element tuples representing key-value pairs.

let mappings = Value::from_mappings(HashMap::<String, u32>::new());
assert!(matches!(mappings, Value::Mappings(_)));

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pub fn is_empty(&self) -> bool

Returns true if the value contained is considered empty.

// Value::None is always empty.
assert_eq!(Value::None.is_empty(), true);

// All primitive values, including Unit, are always not empty, even if they contain the value 0.
assert_eq!(Value::Unit.is_empty(), false);
assert_eq!(Value::from(false).is_empty(), false);
assert_eq!(Value::from(0_u8).is_empty(), false);
assert_eq!(Value::from(0_f32).is_empty(), false);

// For all other types, having a length of 0 will result in is_empty returning true.
assert_eq!(Value::from(Vec::<u8>::new()).is_empty(), true);
assert_eq!(Value::from(b"").is_empty(), true);
assert_eq!(Value::from(vec![0_u8]).is_empty(), false);

assert_eq!(Value::from("").is_empty(), true);
assert_eq!(Value::from("hi").is_empty(), false);

assert_eq!(Value::Sequence(Vec::new()).is_empty(), true);
assert_eq!(Value::from(vec![Value::None]).is_empty(), false);

assert_eq!(Value::Mappings(Vec::new()).is_empty(), true);
assert_eq!(
    Value::from(vec![(Value::None, Value::None)]).is_empty(),
    false
);

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pub fn as_bool(&self) -> bool

Returns the value as a bool.

// Value::None is always false.
assert_eq!(Value::None.as_bool(), false);

// Value::Unit is always true.
assert_eq!(Value::Unit.as_bool(), true);

// Value::Bool will return the contained value
assert_eq!(Value::from(false).as_bool(), false);
assert_eq!(Value::from(true).as_bool(), true);

// All primitive values return true if the value is non-zero.
assert_eq!(Value::from(0_u8).as_bool(), false);
assert_eq!(Value::from(1_u8).as_bool(), true);
assert_eq!(Value::from(0_f32).as_bool(), false);
assert_eq!(Value::from(1_f32).as_bool(), true);

// For all other types, as_bool() returns the result of `!is_empty()`.
assert_eq!(Value::from(Vec::<u8>::new()).as_bool(), false);
assert_eq!(Value::from(b"").as_bool(), false);
assert_eq!(Value::from(vec![0_u8]).as_bool(), true);

assert_eq!(Value::from("").as_bool(), false);
assert_eq!(Value::from("hi").as_bool(), true);

assert_eq!(Value::Sequence(Vec::new()).as_bool(), false);
assert_eq!(Value::from(vec![Value::None]).as_bool(), true);

assert_eq!(Value::Mappings(Vec::new()).as_bool(), false);
assert_eq!(
    Value::from(vec![(Value::None, Value::None)]).as_bool(),
    true
);

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pub fn as_integer(&self) -> Option<Integer>

Returns the value as an Integer. Returns None if the value is not a Self::Float or Self::Integer. Also returns None if the value is a float, but cannot be losslessly converted to an integer.

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pub fn as_float(&self) -> Option<Float>

Returns the value as an Float. Returns None if the value is not a Self::Float or Self::Integer. Also returns None if the value is an integer, but cannot be losslessly converted to a float.

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pub fn as_str(&self) -> Option<&str>

Returns the value as a string, or None if the value is not representable by a string. This will only return a value with variants Self::String and Self::Bytes. Bytes will only be returned if the contained bytes can be safely interpretted as UTF-8.

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pub fn as_bytes(&self) -> Option<&[u8]>

Returns the value as bytes, or None if the value is not stored as a representation of bytes. This will only return a value with variants Self::String and Self::Bytes.

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pub fn values(&self) -> ValueIter<'_> ⓘ

Returns an iterator that iterates over all values contained inside of this value. Returns an empty iterator if not a Self::Sequence or Self::Mappings. If a Self::Mappings, only the value portion of the mapping is returned.

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pub fn mappings(&self) -> Iter<'_, (Self, Self)>

Returns an iterator that iterates over all mappings contained inside of this value. Returns an empty iterator if not a Self::Sequence or Self::Mappings. If a Self::Sequence, the key will always be Self::None.

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