Struct Value

pub struct Value(/* private fields */);

Represents a dynamically typed value in the template engine.

Implementations

impl Value

pub const UNDEFINED: Value = _

The undefined value.

This constant exists because the undefined type does not exist in Rust and this is the only way to construct it.

pub fn from_serialize<T>(value: T) -> Value

where T: Serialize,

Creates a value from something that can be serialized.

This is the method that MiniJinja will generally use whenever a serializable object is passed to one of the APIs that internally want to create a value. For instance this is what context! and render will use.

During serialization of the value, [serializing_for_value] will return true which makes it possible to customize serialization for MiniJinja. For more information see [serializing_for_value].

let val = Value::from_serialize(&vec![1, 2, 3]);

This method does not fail but it might return a value that is not valid. Such values will when operated on fail in the template engine in most situations. This for instance can happen if the underlying implementation of Serialize fails. There are also cases where invalid objects are silently hidden in the engine today. This is for instance the case for when keys are used in hash maps that the engine cannot deal with. Invalid values are considered an implementation detail. There is currently no API to validate a value.

If the deserialization feature is enabled then the inverse of this method is to use the Value type as serializer. You can pass a value into the deserialize method of a type that supports serde deserialization.

pub fn from_safe_string(value: String) -> Value

Creates a value from a safe string.

A safe string is one that will bypass auto escaping. For instance if you want to have the template engine render some HTML without the user having to supply the |safe filter, you can use a value of this type instead.

let val = Value::from_safe_string("<em>note</em>".into());

pub fn from_bytes(value: Vec<u8>) -> Value

Creates a value from a byte vector.

MiniJinja can hold on to bytes and has some limited built-in support for working with them. They are non iterable and not particularly useful in the context of templates. When they are stringified, they are assumed to contain UTF-8 and will be treated as such. They become more useful when a filter can do something with them (eg: base64 encode them etc.).

This method exists so that a value can be constructed as creating a value from a Vec<u8> would normally just create a sequence.

pub fn from_object<T>(value: T) -> Value

where T: Object + Send + Sync + 'static,

Creates a value from a dynamic object.

For more information see [Object].

use std::fmt;

#[derive(Debug)]
struct Thing {
    id: usize,
}

impl Object for Thing {}

let val = Value::from_object(Thing { id: 42 });

pub fn from_dyn_object<T>(value: T) -> Value

where T: Into<DynObject>,

Like from_object but for type erased dynamic objects.

This especially useful if you have an object that has an Arc<T> to another child object that you want to return as a Arc<T> turns into a [DynObject] automatically.

#[derive(Debug)]
pub struct HttpConfig {
    port: usize,
}

#[derive(Debug)]
struct Config {
    http: Arc<HttpConfig>,
}

impl Object for HttpConfig {
    fn enumerate(self: &Arc<Self>) -> Enumerator {
        Enumerator::Str(&["port"])
    }

    fn get_value(self: &Arc<Self>, key: &Value) -> Option<Value> {
        match key.as_str()? {
            "port" => Some(Value::from(self.port)),
            _ => None,
        }
    }
}

impl Object for Config {
    fn enumerate(self: &Arc<Self>) -> Enumerator {
        Enumerator::Str(&["http"])
    }

    fn get_value(self: &Arc<Self>, key: &Value) -> Option<Value> {
        match key.as_str()? {
            "http" => Some(Value::from_dyn_object(self.http.clone())),
            _ => None
        }
    }
}

pub fn make_iterable<I, T, F>(maker: F) -> Value

where I: Iterator<Item = T> + Send + Sync + 'static, T: Into<Value> + Send + Sync + 'static, F: Fn() -> I + Send + Sync + 'static,

Creates a value that is an iterable.

The function is invoked to create a new iterator every time the value is iterated over.

let val = Value::make_iterable(|| 0..10);

Iterators that implement ExactSizeIterator or have a matching lower and upper bound on the Iterator::size_hint report a known loop.length. Iterators that do not fulfill these requirements will not. The same is true for revindex and similar properties.

pub fn make_object_iterable<T, F>(object: T, maker: F) -> Value

where T: Send + Sync + 'static, F: for<'a> Fn(&'a T) -> Box<dyn Iterator<Item = Value> + Sync + Send + 'a> + Send + Sync + 'static,

Creates an iterable that iterates over the given value.

This is similar to make_iterable but it takes an extra reference to a value it can borrow out from. It’s a bit less generic in that it needs to return a boxed iterator of values directly.

let val = Value::make_object_iterable(vec![1, 2, 3], |vec| {
    Box::new(vec.iter().copied().map(Value::from))
});
assert_eq!(val.to_string(), "[1, 2, 3]");

pub fn make_one_shot_iterator<I, T>(iter: I) -> Value

where I: Iterator<Item = T> + Send + Sync + 'static, T: Into<Value> + Send + Sync + 'static,

Creates a value from a one-shot iterator.

This takes an iterator (yielding values that can be turned into a Value) and wraps it in a way that it turns into an iterable value. From the view of the template this can be iterated over exactly once for the most part once exhausted.

Such iterators are strongly recommended against in the general sense due to their surprising behavior, but they can be useful for more advanced use cases where data should be streamed into the template as it becomes available.

Such iterators never have any size hints.

let val = Value::make_one_shot_iterator(0..10);

Attempting to iterate over it a second time will not yield any more items.

pub fn from_function<F, Rv, Args>(f: F) -> Value

where F: Function<Rv, Args> + for<'a> Function<Rv, <Args as FunctionArgs<'a>>::Output>, Rv: FunctionResult, Args: for<'a> FunctionArgs<'a>,

Creates a callable value from a function.

let pow = Value::from_function(|a: u32| a * a);

pub fn kind(&self) -> ValueKind

Returns the kind of the value.

This can be used to determine what’s in the value before trying to perform operations on it.

pub fn is_number(&self) -> bool

Returns true if the value is a number.

To convert a value into a primitive number, use TryFrom or TryInto.

pub fn is_integer(&self) -> bool

Returns true if the number is a real integer.

This can be used to distinguish 42 from 42.0. For the most part the engine keeps these the same.

pub fn is_kwargs(&self) -> bool

Returns true if the map represents keyword arguments.

pub fn is_true(&self) -> bool

Is this value considered true?

The engine inherits the same behavior as Jinja2 when it comes to considering objects true. Empty objects are generally not considered true. For custom objects this is customized by [Object::is_true].

pub fn is_safe(&self) -> bool

Returns true if this value is safe.

pub fn is_undefined(&self) -> bool

Returns true if this value is undefined.

pub fn is_none(&self) -> bool

Returns true if this value is none.

pub fn to_str(&self) -> Option<Arc<str>>

If the value is a string, return it.

This will also perform a lossy string conversion of bytes from utf-8.

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

If the value is a string, return it.

This will also return well formed utf-8 bytes as string.

pub fn as_usize(&self) -> Option<usize>

If this is an i64 return it

pub fn as_i64(&self) -> Option<i64>

If this is an i64 return it

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

Returns the bytes of this value if they exist.

pub fn as_object(&self) -> Option<&DynObject>

If the value is an object a reference to it is returned.

The returned value is a reference to a type erased [DynObject]. For a specific type use downcast_object instead.

pub fn len(&self) -> Option<usize>

Returns the length of the contained value.

Values without a length will return None.

let seq = Value::from(vec![1, 2, 3, 4]);
assert_eq!(seq.len(), Some(4));

pub fn get_attr(&self, key: &str) -> Result<Value, Error>

Looks up an attribute by attribute name.

This this returns UNDEFINED when an invalid key is resolved. An error is returned if the value does not contain an object that has attributes.

let ctx = minijinja::context! {
    foo => "Foo"
};
let value = ctx.get_attr("foo")?;
assert_eq!(value.to_string(), "Foo");

pub fn get_item_by_index(&self, idx: usize) -> Result<Value, Error>

Looks up an index of the value.

This is a shortcut for get_item.

let seq = Value::from(vec![0u32, 1, 2]);
let value = seq.get_item_by_index(1).unwrap();
assert_eq!(value.try_into().ok(), Some(1));

pub fn get_item(&self, key: &Value) -> Result<Value, Error>

Looks up an item (or attribute) by key.

This is similar to get_attr but instead of using a string key this can be any key. For instance this can be used to index into sequences. Like get_attr this returns UNDEFINED when an invalid key is looked up.

let ctx = minijinja::context! {
    foo => "Foo",
};
let value = ctx.get_item(&Value::from("foo")).unwrap();
assert_eq!(value.to_string(), "Foo");

pub fn try_iter(&self) -> Result<ValueIter, Error>

Iterates over the value.

Depending on the kind of the value the iterator has a different behavior.

• [ValueKind::Map]: the iterator yields the keys of the map.
• [ValueKind::Seq] / [ValueKind::Iterable]: the iterator yields the items in the sequence.
• [ValueKind::String]: the iterator yields characters in a string.
• [ValueKind::None] / [ValueKind::Undefined]: the iterator is empty.

let value = Value::from({
    let mut m = std::collections::BTreeMap::new();
    m.insert("foo", 42);
    m.insert("bar", 23);
    m
});
for key in value.try_iter()? {
    let value = value.get_item(&key)?;
    println!("{} = {}", key, value);
}

pub fn reverse(&self) -> Result<Value, Error>

Returns a reversed view of this value.

This is implemented for the following types with the following behaviors:

• undefined or none: value returned unchanged.
• string and bytes: returns a reversed version of that value
• iterables: returns a reversed version of the iterable. If the iterable is not reversible itself, it consumes it and then reverses it.

pub fn downcast_object_ref<T>(&self) -> Option<&T>

where T: 'static,

Returns some reference to the boxed object if it is of type T, or None if it isn’t.

This is basically the “reverse” of from_object and from_dyn_object. It’s also a shortcut for downcast_ref on the return value of as_object.

Example

use std::fmt;

#[derive(Debug)]
struct Thing {
    id: usize,
}

impl Object for Thing {}

let x_value = Value::from_object(Thing { id: 42 });
let thing = x_value.downcast_object_ref::<Thing>().unwrap();
assert_eq!(thing.id, 42);

pub fn downcast_object<T>(&self) -> Option<Arc<T>>

where T: 'static,

Like downcast_object_ref but returns the actual object.

pub fn call( &self, state: &State<'_, '_>, args: &[Value], ) -> Result<Value, Error>

Calls the value directly.

If the value holds a function or macro, this invokes it. Note that in MiniJinja there is a separate namespace for methods on objects and callable items. To call methods (which should be a rather rare occurrence) you have to use call_method.

The args slice is for the arguments of the function call. To pass keyword arguments use the [Kwargs] type.

Usually the state is already available when it’s useful to call this method, but when it’s not available you can get a fresh template state straight from the Template via new_state.

let func = Value::from_function(|v: i64, kwargs: Kwargs| {
    v * kwargs.get::<i64>("mult").unwrap_or(1)
});
let rv = func.call(
    state,
    &[
        Value::from(42),
        Value::from(Kwargs::from_iter([("mult", Value::from(2))])),
    ],
).unwrap();
assert_eq!(rv, Value::from(84));

With the args! macro creating an argument slice is simplified:

let func = Value::from_function(|v: i64, kwargs: Kwargs| {
    v * kwargs.get::<i64>("mult").unwrap_or(1)
});
let rv = func.call(state, args!(42, mult => 2)).unwrap();
assert_eq!(rv, Value::from(84));

pub fn call_method( &self, state: &State<'_, '_>, name: &str, args: &[Value], ) -> Result<Value, Error>

Calls a method on the value.

The name of the method is name, the arguments passed are in the args slice.

Trait Implementations

impl<'a> ArgType<'a> for &Value

type Output = &'a Value

The output type of this argument.

impl<'a> ArgType<'a> for Value

type Output = Value

The output type of this argument.

impl Clone for Value

fn clone(&self) -> Value

Returns a copy 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<(), Error>

Formats the value using the given formatter.

impl Default for Value

fn default() -> Value

Returns the “default value” for a type.

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

fn deserialize<D>( deserializer: D, ) -> Result<Value, <D as Deserializer<'de>>::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<'de, 'v> Deserializer<'de> for &'v Value

type Error = Error

The error type that can be returned if some error occurs during deserialization.

fn deserialize_any<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, Error>

where V: Visitor<'de>,

Require the Deserializer to figure out how to drive the visitor based on what data type is in the input.

fn deserialize_option<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an optional value.

fn deserialize_enum<V>( self, name: &'static str, variants: &'static [&'static str], visitor: V, ) -> Result<<V as Visitor<'de>>::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an enum value with a particular name and possible variants.

fn deserialize_unit_struct<V>( self, name: &'static str, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a unit struct with a particular name.

fn deserialize_newtype_struct<V>( self, name: &'static str, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a newtype struct with a particular name.

fn deserialize_bool<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <&'v Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a bool value.

fn deserialize_u8<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <&'v Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u8 value.

fn deserialize_u16<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <&'v Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u16 value.

fn deserialize_u32<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <&'v Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u32 value.

fn deserialize_u64<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <&'v Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u64 value.

fn deserialize_i8<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <&'v Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i8 value.

fn deserialize_i16<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <&'v Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i16 value.

fn deserialize_i32<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <&'v Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i32 value.

fn deserialize_i64<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <&'v Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i64 value.

fn deserialize_f32<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <&'v Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a f32 value.

fn deserialize_f64<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <&'v Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a f64 value.

fn deserialize_char<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <&'v Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a char value.

fn deserialize_str<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <&'v Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a string value and does not benefit from taking ownership of buffered data owned by the Deserializer.

fn deserialize_string<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <&'v Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a string value and would benefit from taking ownership of buffered data owned by the Deserializer.

fn deserialize_unit<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <&'v Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a unit value.

fn deserialize_seq<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <&'v Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a sequence of values.

fn deserialize_bytes<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <&'v Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a byte array and does not benefit from taking ownership of buffered data owned by the Deserializer.

fn deserialize_byte_buf<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <&'v Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a byte array and would benefit from taking ownership of buffered data owned by the Deserializer.

fn deserialize_map<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <&'v Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a map of key-value pairs.

fn deserialize_tuple_struct<V>( self, name: &'static str, len: usize, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <&'v Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a tuple struct with a particular name and number of fields.

fn deserialize_struct<V>( self, name: &'static str, fields: &'static [&'static str], visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <&'v Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a struct with a particular name and fields.

fn deserialize_tuple<V>( self, len: usize, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <&'v Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a sequence of values and knows how many values there are without looking at the serialized data.

fn deserialize_ignored_any<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <&'v Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type needs to deserialize a value whose type doesn’t matter because it is ignored.

fn deserialize_identifier<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <&'v Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting the name of a struct field or the discriminant of an enum variant.

fn deserialize_i128<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, Self::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i128 value.

fn deserialize_u128<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, Self::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an u128 value.

fn is_human_readable(&self) -> bool

Determine whether Deserialize implementations should expect to deserialize their human-readable form.

impl<'de> Deserializer<'de> for Value

type Error = Error

The error type that can be returned if some error occurs during deserialization.

fn deserialize_any<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, Error>

where V: Visitor<'de>,

Require the Deserializer to figure out how to drive the visitor based on what data type is in the input.

fn deserialize_option<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an optional value.

fn deserialize_enum<V>( self, _name: &'static str, _variants: &'static [&'static str], visitor: V, ) -> Result<<V as Visitor<'de>>::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an enum value with a particular name and possible variants.

fn deserialize_unit_struct<V>( self, _name: &'static str, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a unit struct with a particular name.

fn deserialize_newtype_struct<V>( self, _name: &'static str, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a newtype struct with a particular name.

fn deserialize_bool<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a bool value.

fn deserialize_u8<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u8 value.

fn deserialize_u16<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u16 value.

fn deserialize_u32<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u32 value.

fn deserialize_u64<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u64 value.

fn deserialize_i8<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i8 value.

fn deserialize_i16<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i16 value.

fn deserialize_i32<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i32 value.

fn deserialize_i64<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i64 value.

fn deserialize_f32<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a f32 value.

fn deserialize_f64<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a f64 value.

fn deserialize_char<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a char value.

fn deserialize_str<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a string value and does not benefit from taking ownership of buffered data owned by the Deserializer.

fn deserialize_string<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a string value and would benefit from taking ownership of buffered data owned by the Deserializer.

fn deserialize_unit<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a unit value.

fn deserialize_seq<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a sequence of values.

fn deserialize_bytes<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a byte array and does not benefit from taking ownership of buffered data owned by the Deserializer.

fn deserialize_byte_buf<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a byte array and would benefit from taking ownership of buffered data owned by the Deserializer.

fn deserialize_map<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a map of key-value pairs.

fn deserialize_tuple_struct<V>( self, name: &'static str, len: usize, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a tuple struct with a particular name and number of fields.

fn deserialize_struct<V>( self, name: &'static str, fields: &'static [&'static str], visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a struct with a particular name and fields.

fn deserialize_tuple<V>( self, len: usize, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a sequence of values and knows how many values there are without looking at the serialized data.

fn deserialize_ignored_any<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type needs to deserialize a value whose type doesn’t matter because it is ignored.

fn deserialize_identifier<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <Value as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting the name of a struct field or the discriminant of an enum variant.

fn deserialize_i128<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, Self::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i128 value.

fn deserialize_u128<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, Self::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an u128 value.

fn is_human_readable(&self) -> bool

Determine whether Deserialize implementations should expect to deserialize their human-readable form.

impl Display for Value

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

Formats the value using the given formatter.

impl<'a> From<&'a [u8]> for Value

fn from(val: &'a [u8]) -> Value

Converts to this type from the input type.

impl<'a> From<&'a String> for Value

fn from(val: &'a String) -> Value

Converts to this type from the input type.

impl<'a> From<&'a str> for Value

fn from(val: &'a str) -> Value

Converts to this type from the input type.

impl From<()> for Value

fn from(_: ()) -> Value

Converts to this type from the input type.

impl From<Arc<Vec<u8>>> for Value

fn from(val: Arc<Vec<u8>>) -> Value

Converts to this type from the input type.

impl From<Arc<str>> for Value

fn from(value: Arc<str>) -> Value

Converts to this type from the input type.

impl<'a, V> From<BTreeMap<&'a str, V>> for Value

where V: Into<Value> + Send + Sync + Clone + Debug + 'static,

fn from(val: BTreeMap<&'a str, V>) -> Value

Converts to this type from the input type.

impl<V> From<BTreeMap<Arc<str>, V>> for Value

where V: Into<Value> + Send + Sync + Clone + Debug + 'static,

fn from(val: BTreeMap<Arc<str>, V>) -> Value

Converts to this type from the input type.

impl<'a, V> From<BTreeMap<Cow<'a, str>, V>> for Value

where V: Into<Value> + Send + Sync + Clone + Debug + 'static,

fn from(val: BTreeMap<Cow<'a, str>, V>) -> Value

Converts to this type from the input type.

impl<V> From<BTreeMap<String, V>> for Value

where V: Into<Value> + Send + Sync + Clone + Debug + 'static,

fn from(val: BTreeMap<String, V>) -> Value

Converts to this type from the input type.

impl<V> From<BTreeMap<Value, V>> for Value

where V: Into<Value> + Send + Sync + Clone + Debug + 'static,

fn from(val: BTreeMap<Value, V>) -> Value

Converts to this type from the input type.

impl<T> From<BTreeSet<T>> for Value

where T: Into<Value> + Clone + Send + Sync + Debug + 'static,

fn from(val: BTreeSet<T>) -> Value

Converts to this type from the input type.

impl<'a> From<Cow<'a, str>> for Value

fn from(val: Cow<'a, str>) -> Value

Converts to this type from the input type.

impl From<DynObject> for Value

fn from(val: DynObject) -> Value

Converts to this type from the input type.

impl From<Error> for Value

fn from(value: Error) -> Value

Converts to this type from the input type.

impl<'a, V> From<HashMap<&'a str, V>> for Value

where V: Into<Value> + Send + Sync + Clone + Debug + 'static,

fn from(val: HashMap<&'a str, V>) -> Value

Converts to this type from the input type.

impl<V> From<HashMap<Arc<str>, V>> for Value

where V: Into<Value> + Send + Sync + Clone + Debug + 'static,

fn from(val: HashMap<Arc<str>, V>) -> Value

Converts to this type from the input type.

impl<'a, V> From<HashMap<Cow<'a, str>, V>> for Value

where V: Into<Value> + Send + Sync + Clone + Debug + 'static,

fn from(val: HashMap<Cow<'a, str>, V>) -> Value

Converts to this type from the input type.

impl<V> From<HashMap<String, V>> for Value

where V: Into<Value> + Send + Sync + Clone + Debug + 'static,

fn from(val: HashMap<String, V>) -> Value

Converts to this type from the input type.

impl<V> From<HashMap<Value, V>> for Value

where V: Into<Value> + Send + Sync + Clone + Debug + 'static,

fn from(val: HashMap<Value, V>) -> Value

Converts to this type from the input type.

impl<T> From<HashSet<T>> for Value

where T: Into<Value> + Clone + Send + Sync + Debug + 'static,

fn from(val: HashSet<T>) -> Value

Converts to this type from the input type.

impl From<Kwargs> for Value

fn from(value: Kwargs) -> Value

Converts to this type from the input type.

impl<T> From<LinkedList<T>> for Value

where T: Into<Value> + Clone + Send + Sync + Debug + 'static,

fn from(val: LinkedList<T>) -> Value

Converts to this type from the input type.

impl<I> From<Option<I>> for Value

where I: Into<Value>,

fn from(value: Option<I>) -> Value

Converts to this type from the input type.

impl From<String> for Value

fn from(val: String) -> Value

Converts to this type from the input type.

impl From<ValueRepr> for Value

fn from(val: ValueRepr) -> Value

Converts to this type from the input type.

impl<T> From<Vec<T>> for Value

where T: Into<Value> + Clone + Send + Sync + Debug + 'static,

fn from(val: Vec<T>) -> Value

Converts to this type from the input type.

impl<T> From<VecDeque<T>> for Value

where T: Into<Value> + Clone + Send + Sync + Debug + 'static,

fn from(val: VecDeque<T>) -> Value

Converts to this type from the input type.

impl From<bool> for Value

fn from(val: bool) -> Value

Converts to this type from the input type.

impl From<char> for Value

fn from(val: char) -> Value

Converts to this type from the input type.

impl From<f32> for Value

fn from(val: f32) -> Value

Converts to this type from the input type.

impl From<f64> for Value

fn from(val: f64) -> Value

Converts to this type from the input type.

impl From<i128> for Value

fn from(val: i128) -> Value

Converts to this type from the input type.

impl From<i16> for Value

fn from(val: i16) -> Value

Converts to this type from the input type.

impl From<i32> for Value

fn from(val: i32) -> Value

Converts to this type from the input type.

impl From<i64> for Value

fn from(val: i64) -> Value

Converts to this type from the input type.

impl From<i8> for Value

fn from(val: i8) -> Value

Converts to this type from the input type.

impl From<isize> for Value

fn from(val: isize) -> Value

Converts to this type from the input type.

impl From<u128> for Value

fn from(val: u128) -> Value

Converts to this type from the input type.

impl From<u16> for Value

fn from(val: u16) -> Value

Converts to this type from the input type.

impl From<u32> for Value

fn from(val: u32) -> Value

Converts to this type from the input type.

impl From<u64> for Value

fn from(val: u64) -> Value

Converts to this type from the input type.

impl From<u8> for Value

fn from(val: u8) -> Value

Converts to this type from the input type.

impl From<usize> for Value

fn from(val: usize) -> Value

Converts to this type from the input type.

impl<K, V> FromIterator<(K, V)> for Value

where K: Into<Value>, V: Into<Value>,

fn from_iter<T>(iter: T) -> Value

where T: IntoIterator<Item = (K, V)>,

Creates a value from an iterator.

impl<V> FromIterator<V> for Value

where V: Into<Value>,

fn from_iter<T>(iter: T) -> Value

where T: IntoIterator<Item = V>,

Creates a value from an iterator.

impl Hash for Value

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

where H: Hasher,

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<'de> IntoDeserializer<'de, Error> for &'de Value

type Deserializer = &'de Value

The type of the deserializer being converted into.

fn into_deserializer(self) -> &'de Value

Convert this value into a deserializer.

impl<'de> IntoDeserializer<'de, Error> for Value

type Deserializer = Value

The type of the deserializer being converted into.

fn into_deserializer(self) -> Value

Convert this value into a deserializer.

impl Ord for Value

fn cmp(&self, other: &Value) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

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 PartialOrd for Value

fn partial_cmp(&self, other: &Value) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Serialize for Value

fn serialize<S>( &self, serializer: S, ) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>

where S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for Value