Enum Value 

pub enum Value {
    Bool(bool),
    I8(i8),
    I16(i16),
    I32(i32),
    I64(i64),
    I128(i128),
    U8(u8),
    U16(u16),
    U32(u32),
    U64(u64),
    U128(u128),
    F32(f32),
    F64(f64),
    Char(char),
    Str(String),
    Bytes(Vec<u8>),
    None,
    Some(Box<Value>),
    Unit,
    UnitStruct(&'static str),
    UnitVariant {
        name: &'static str,
        variant_index: u32,
        variant: &'static str,
    },
    NewtypeStruct(&'static str, Box<Value>),
    NewtypeVariant {
        name: &'static str,
        variant_index: u32,
        variant: &'static str,
        value: Box<Value>,
    },
    Seq(Vec<Value>),
    Tuple(Vec<Value>),
    TupleStruct(&'static str, Vec<Value>),
    TupleVariant {
        name: &'static str,
        variant_index: u32,
        variant: &'static str,
        fields: Vec<Value>,
    },
    Map(IndexMap<Value, Value>),
    Struct(&'static str, IndexMap<&'static str, Value>),
    StructVariant {
        name: &'static str,
        variant_index: u32,
        variant: &'static str,
        fields: IndexMap<&'static str, Value>,
    },
}

Value is the internal represents of serde’s data format.

Value is the one-to-one map to serde’s data format. Theoretically, Value can be converted from/to any serde format.

Value is a inter data represents which means:

Value should be constructed or consumed by into_value or from_value.

• t.into_value() -> Value
• into_value(t) -> Value
• T::from_value(v) -> T
• from_value(v) -> T

Value also implements serde::Serialize and serde::Deserialize. Serialize and Deserialize on Value that converted from T will be the same with T.

Examples

Conversion between T and Value

use anyhow::Result;
use serde_bridge::{from_value, into_value, FromValue, IntoValue, Value};

fn main() -> Result<()> {
    let v = bool::from_value(Value::Bool(true))?;
    assert!(v);

    let v: bool = from_value(Value::Bool(true))?;
    assert!(v);

    let v = true.into_value()?;
    assert_eq!(v, Value::Bool(true));

    let v = into_value(true)?;
    assert_eq!(v, Value::Bool(true));

    Ok(())
}

Transparent Serialize and Deserialize

use anyhow::Result;
use serde_bridge::{from_value, into_value, FromValue, IntoValue, Value};
use serde_json;

fn main() -> Result<()> {
    let raw = serde_json::to_string(&true)?;
    let value = serde_json::to_string(&true.into_value()?)?;
    assert_eq!(raw, value);

    let raw: bool = serde_json::from_str("true")?;
    let value: Value = serde_json::from_str("true")?;
    assert_eq!(raw, bool::from_value(value)?);

    Ok(())
}

Variants

Bool(bool)

primitive types for bool: false/true

I8(i8)

primitive types for i8

I16(i16)

primitive types for i16

I32(i32)

primitive types for i32

I64(i64)

primitive types for i64

I128(i128)

primitive types for i128

U8(u8)

primitive types for u8

U16(u16)

primitive types for u16

U32(u32)

primitive types for u32

U64(u64)

primitive types for u64

U128(u128)

primitive types for u128

F32(f32)

primitive types for f32

F64(f64)

primitive types for f64

Char(char)

primitive types for char

Str(String)

string type

UTF-8 bytes with a length and no null terminator. May contain 0-bytes.

Bytes(Vec<u8>)

byte array

Similar to strings, during deserialization byte arrays can be transient, owned, or borrowed.

None

None part of an Option

Some(Box<Value>)

Some part of an Option

Note

We use Box here to workaround recursive data type.

Unit

The type of () in Rust.

It represents an anonymous value containing no data.

UnitStruct(&'static str)

For example struct Unit or PhantomData<T>.

It represents a named value containing no data.

UnitVariant

For example the E::A and E::B in enum E { A, B }.

Fields

name: &'static str

variant_index: u32

variant: &'static str

NewtypeStruct(&'static str, Box<Value>)

For example struct Millimeters(u8).

NewtypeVariant

For example the E::N in enum E { N(u8) }.

Note

We use Box here to workaround recursive data type.

Fields

name: &'static str

variant_index: u32

variant: &'static str

value: Box<Value>

Seq(Vec<Value>)

A variably sized heterogeneous sequence of values, for example Vec<T> or HashSet<T>

Tuple(Vec<Value>)

A statically sized heterogeneous sequence of values for which the length will be known at deserialization time without looking at the serialized data.

For example (u8,) or (String, u64, Vec<T>) or [u64; 10].

TupleStruct(&'static str, Vec<Value>)

A named tuple, for example struct Rgb(u8, u8, u8).

TupleVariant

For example the E::T in enum E { T(u8, u8) }.

Fields

name: &'static str

variant_index: u32

variant: &'static str

fields: Vec<Value>

Map(IndexMap<Value, Value>)

A variably sized heterogeneous key-value pairing, for example BTreeMap<K, V>

Struct(&'static str, IndexMap<&'static str, Value>)

A statically sized heterogeneous key-value pairing in which the keys are compile-time constant strings and will be known at deserialization time without looking at the serialized data.

For example struct S { r: u8, g: u8, b: u8 }.

StructVariant

For example the E::S in enum E { S { r: u8, g: u8, b: u8 } }.

Fields

name: &'static str

variant_index: u32

variant: &'static str

fields: IndexMap<&'static str, Value>

Trait Implementations

impl Clone for Value

fn clone(&self) -> Value

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Value

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Value

fn deserialize<D>(d: D) -> Result<Self, D::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl From<Value> for Deserializer

fn from(v: Value) -> Self

Converts to this type from the input type.

impl Hash for Value

Implement Hash for Value so that we can use value as hash key.

Notes

Not all variants supports hash.

FIXME

does this implementation correct?

fn hash<H: Hasher>(&self, state: &mut H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Value

fn eq(&self, other: &Value) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for Value

Implement transparent serde::Serialize for Value.

Serialize on Value that converted from T will be the same with T.

fn serialize<S>(&self, s: S) -> Result<S::Ok, S::Error>

where S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for Value

impl StructuralPartialEq for Value