Struct serde_json::Map

pub struct Map<K, V> { /* private fields */ }

Represents a JSON key/value type.

Implementations

impl Map<String, Value>

pub fn new() -> Self

Makes a new empty Map.

Examples found in repository

src/map.rs (line 414)

            fn visit_unit<E>(self) -> Result<Self::Value, E>
            where
                E: de::Error,
            {
                Ok(Map::new())
            }

            #[cfg(any(feature = "std", feature = "alloc"))]
            #[inline]
            fn visit_map<V>(self, mut visitor: V) -> Result<Self::Value, V::Error>
            where
                V: de::MapAccess<'de>,
            {
                let mut values = Map::new();

                while let Some((key, value)) = tri!(visitor.next_entry()) {
                    values.insert(key, value);
                }

                Ok(values)
            }

src/value/index.rs (line 98)

    fn index_or_insert<'v>(&self, v: &'v mut Value) -> &'v mut Value {
        if let Value::Null = v {
            *v = Value::Object(Map::new());
        }
        match v {
            Value::Object(map) => map.entry(self.to_owned()).or_insert(Value::Null),
            _ => panic!("cannot access key {:?} in JSON {}", self, Type(v)),
        }
    }

src/value/ser.rs (line 190)

    fn serialize_newtype_variant<T>(
        self,
        _name: &'static str,
        _variant_index: u32,
        variant: &'static str,
        value: &T,
    ) -> Result<Value>
    where
        T: ?Sized + Serialize,
    {
        let mut values = Map::new();
        values.insert(String::from(variant), tri!(to_value(value)));
        Ok(Value::Object(values))
    }

    #[inline]
    fn serialize_none(self) -> Result<Value> {
        self.serialize_unit()
    }

    #[inline]
    fn serialize_some<T>(self, value: &T) -> Result<Value>
    where
        T: ?Sized + Serialize,
    {
        value.serialize(self)
    }

    fn serialize_seq(self, len: Option<usize>) -> Result<Self::SerializeSeq> {
        Ok(SerializeVec {
            vec: Vec::with_capacity(len.unwrap_or(0)),
        })
    }

    fn serialize_tuple(self, len: usize) -> Result<Self::SerializeTuple> {
        self.serialize_seq(Some(len))
    }

    fn serialize_tuple_struct(
        self,
        _name: &'static str,
        len: usize,
    ) -> Result<Self::SerializeTupleStruct> {
        self.serialize_seq(Some(len))
    }

    fn serialize_tuple_variant(
        self,
        _name: &'static str,
        _variant_index: u32,
        variant: &'static str,
        len: usize,
    ) -> Result<Self::SerializeTupleVariant> {
        Ok(SerializeTupleVariant {
            name: String::from(variant),
            vec: Vec::with_capacity(len),
        })
    }

    fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap> {
        Ok(SerializeMap::Map {
            map: Map::new(),
            next_key: None,
        })
    }

    fn serialize_struct(self, name: &'static str, len: usize) -> Result<Self::SerializeStruct> {
        match name {
            #[cfg(feature = "arbitrary_precision")]
            crate::number::TOKEN => Ok(SerializeMap::Number { out_value: None }),
            #[cfg(feature = "raw_value")]
            crate::raw::TOKEN => Ok(SerializeMap::RawValue { out_value: None }),
            _ => self.serialize_map(Some(len)),
        }
    }

    fn serialize_struct_variant(
        self,
        _name: &'static str,
        _variant_index: u32,
        variant: &'static str,
        _len: usize,
    ) -> Result<Self::SerializeStructVariant> {
        Ok(SerializeStructVariant {
            name: String::from(variant),
            map: Map::new(),
        })
    }

    fn collect_str<T>(self, value: &T) -> Result<Value>
    where
        T: ?Sized + Display,
    {
        Ok(Value::String(value.to_string()))
    }
}

pub struct SerializeVec {
    vec: Vec<Value>,
}

pub struct SerializeTupleVariant {
    name: String,
    vec: Vec<Value>,
}

pub enum SerializeMap {
    Map {
        map: Map<String, Value>,
        next_key: Option<String>,
    },
    #[cfg(feature = "arbitrary_precision")]
    Number { out_value: Option<Value> },
    #[cfg(feature = "raw_value")]
    RawValue { out_value: Option<Value> },
}

pub struct SerializeStructVariant {
    name: String,
    map: Map<String, Value>,
}

impl serde::ser::SerializeSeq for SerializeVec {
    type Ok = Value;
    type Error = Error;

    fn serialize_element<T>(&mut self, value: &T) -> Result<()>
    where
        T: ?Sized + Serialize,
    {
        self.vec.push(tri!(to_value(value)));
        Ok(())
    }

    fn end(self) -> Result<Value> {
        Ok(Value::Array(self.vec))
    }
}

impl serde::ser::SerializeTuple for SerializeVec {
    type Ok = Value;
    type Error = Error;

    fn serialize_element<T>(&mut self, value: &T) -> Result<()>
    where
        T: ?Sized + Serialize,
    {
        serde::ser::SerializeSeq::serialize_element(self, value)
    }

    fn end(self) -> Result<Value> {
        serde::ser::SerializeSeq::end(self)
    }
}

impl serde::ser::SerializeTupleStruct for SerializeVec {
    type Ok = Value;
    type Error = Error;

    fn serialize_field<T>(&mut self, value: &T) -> Result<()>
    where
        T: ?Sized + Serialize,
    {
        serde::ser::SerializeSeq::serialize_element(self, value)
    }

    fn end(self) -> Result<Value> {
        serde::ser::SerializeSeq::end(self)
    }
}

impl serde::ser::SerializeTupleVariant for SerializeTupleVariant {
    type Ok = Value;
    type Error = Error;

    fn serialize_field<T>(&mut self, value: &T) -> Result<()>
    where
        T: ?Sized + Serialize,
    {
        self.vec.push(tri!(to_value(value)));
        Ok(())
    }

    fn end(self) -> Result<Value> {
        let mut object = Map::new();

        object.insert(self.name, Value::Array(self.vec));

        Ok(Value::Object(object))
    }
}

impl serde::ser::SerializeMap for SerializeMap {
    type Ok = Value;
    type Error = Error;

    fn serialize_key<T>(&mut self, key: &T) -> Result<()>
    where
        T: ?Sized + Serialize,
    {
        match self {
            SerializeMap::Map { next_key, .. } => {
                *next_key = Some(tri!(key.serialize(MapKeySerializer)));
                Ok(())
            }
            #[cfg(feature = "arbitrary_precision")]
            SerializeMap::Number { .. } => unreachable!(),
            #[cfg(feature = "raw_value")]
            SerializeMap::RawValue { .. } => unreachable!(),
        }
    }

    fn serialize_value<T>(&mut self, value: &T) -> Result<()>
    where
        T: ?Sized + Serialize,
    {
        match self {
            SerializeMap::Map { map, next_key } => {
                let key = next_key.take();
                // Panic because this indicates a bug in the program rather than an
                // expected failure.
                let key = key.expect("serialize_value called before serialize_key");
                map.insert(key, tri!(to_value(value)));
                Ok(())
            }
            #[cfg(feature = "arbitrary_precision")]
            SerializeMap::Number { .. } => unreachable!(),
            #[cfg(feature = "raw_value")]
            SerializeMap::RawValue { .. } => unreachable!(),
        }
    }

    fn end(self) -> Result<Value> {
        match self {
            SerializeMap::Map { map, .. } => Ok(Value::Object(map)),
            #[cfg(feature = "arbitrary_precision")]
            SerializeMap::Number { .. } => unreachable!(),
            #[cfg(feature = "raw_value")]
            SerializeMap::RawValue { .. } => unreachable!(),
        }
    }
}

struct MapKeySerializer;

fn key_must_be_a_string() -> Error {
    Error::syntax(ErrorCode::KeyMustBeAString, 0, 0)
}

impl serde::Serializer for MapKeySerializer {
    type Ok = String;
    type Error = Error;

    type SerializeSeq = Impossible<String, Error>;
    type SerializeTuple = Impossible<String, Error>;
    type SerializeTupleStruct = Impossible<String, Error>;
    type SerializeTupleVariant = Impossible<String, Error>;
    type SerializeMap = Impossible<String, Error>;
    type SerializeStruct = Impossible<String, Error>;
    type SerializeStructVariant = Impossible<String, Error>;

    #[inline]
    fn serialize_unit_variant(
        self,
        _name: &'static str,
        _variant_index: u32,
        variant: &'static str,
    ) -> Result<String> {
        Ok(variant.to_owned())
    }

    #[inline]
    fn serialize_newtype_struct<T>(self, _name: &'static str, value: &T) -> Result<String>
    where
        T: ?Sized + Serialize,
    {
        value.serialize(self)
    }

    fn serialize_bool(self, _value: bool) -> Result<String> {
        Err(key_must_be_a_string())
    }

    fn serialize_i8(self, value: i8) -> Result<String> {
        Ok(value.to_string())
    }

    fn serialize_i16(self, value: i16) -> Result<String> {
        Ok(value.to_string())
    }

    fn serialize_i32(self, value: i32) -> Result<String> {
        Ok(value.to_string())
    }

    fn serialize_i64(self, value: i64) -> Result<String> {
        Ok(value.to_string())
    }

    fn serialize_u8(self, value: u8) -> Result<String> {
        Ok(value.to_string())
    }

    fn serialize_u16(self, value: u16) -> Result<String> {
        Ok(value.to_string())
    }

    fn serialize_u32(self, value: u32) -> Result<String> {
        Ok(value.to_string())
    }

    fn serialize_u64(self, value: u64) -> Result<String> {
        Ok(value.to_string())
    }

    fn serialize_f32(self, _value: f32) -> Result<String> {
        Err(key_must_be_a_string())
    }

    fn serialize_f64(self, _value: f64) -> Result<String> {
        Err(key_must_be_a_string())
    }

    #[inline]
    fn serialize_char(self, value: char) -> Result<String> {
        Ok({
            let mut s = String::new();
            s.push(value);
            s
        })
    }

    #[inline]
    fn serialize_str(self, value: &str) -> Result<String> {
        Ok(value.to_owned())
    }

    fn serialize_bytes(self, _value: &[u8]) -> Result<String> {
        Err(key_must_be_a_string())
    }

    fn serialize_unit(self) -> Result<String> {
        Err(key_must_be_a_string())
    }

    fn serialize_unit_struct(self, _name: &'static str) -> Result<String> {
        Err(key_must_be_a_string())
    }

    fn serialize_newtype_variant<T>(
        self,
        _name: &'static str,
        _variant_index: u32,
        _variant: &'static str,
        _value: &T,
    ) -> Result<String>
    where
        T: ?Sized + Serialize,
    {
        Err(key_must_be_a_string())
    }

    fn serialize_none(self) -> Result<String> {
        Err(key_must_be_a_string())
    }

    fn serialize_some<T>(self, _value: &T) -> Result<String>
    where
        T: ?Sized + Serialize,
    {
        Err(key_must_be_a_string())
    }

    fn serialize_seq(self, _len: Option<usize>) -> Result<Self::SerializeSeq> {
        Err(key_must_be_a_string())
    }

    fn serialize_tuple(self, _len: usize) -> Result<Self::SerializeTuple> {
        Err(key_must_be_a_string())
    }

    fn serialize_tuple_struct(
        self,
        _name: &'static str,
        _len: usize,
    ) -> Result<Self::SerializeTupleStruct> {
        Err(key_must_be_a_string())
    }

    fn serialize_tuple_variant(
        self,
        _name: &'static str,
        _variant_index: u32,
        _variant: &'static str,
        _len: usize,
    ) -> Result<Self::SerializeTupleVariant> {
        Err(key_must_be_a_string())
    }

    fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap> {
        Err(key_must_be_a_string())
    }

    fn serialize_struct(self, _name: &'static str, _len: usize) -> Result<Self::SerializeStruct> {
        Err(key_must_be_a_string())
    }

    fn serialize_struct_variant(
        self,
        _name: &'static str,
        _variant_index: u32,
        _variant: &'static str,
        _len: usize,
    ) -> Result<Self::SerializeStructVariant> {
        Err(key_must_be_a_string())
    }

    fn collect_str<T>(self, value: &T) -> Result<String>
    where
        T: ?Sized + Display,
    {
        Ok(value.to_string())
    }
}

impl serde::ser::SerializeStruct for SerializeMap {
    type Ok = Value;
    type Error = Error;

    fn serialize_field<T>(&mut self, key: &'static str, value: &T) -> Result<()>
    where
        T: ?Sized + Serialize,
    {
        match self {
            SerializeMap::Map { .. } => serde::ser::SerializeMap::serialize_entry(self, key, value),
            #[cfg(feature = "arbitrary_precision")]
            SerializeMap::Number { out_value } => {
                if key == crate::number::TOKEN {
                    *out_value = Some(value.serialize(NumberValueEmitter)?);
                    Ok(())
                } else {
                    Err(invalid_number())
                }
            }
            #[cfg(feature = "raw_value")]
            SerializeMap::RawValue { out_value } => {
                if key == crate::raw::TOKEN {
                    *out_value = Some(value.serialize(RawValueEmitter)?);
                    Ok(())
                } else {
                    Err(invalid_raw_value())
                }
            }
        }
    }

    fn end(self) -> Result<Value> {
        match self {
            SerializeMap::Map { .. } => serde::ser::SerializeMap::end(self),
            #[cfg(feature = "arbitrary_precision")]
            SerializeMap::Number { out_value, .. } => {
                Ok(out_value.expect("number value was not emitted"))
            }
            #[cfg(feature = "raw_value")]
            SerializeMap::RawValue { out_value, .. } => {
                Ok(out_value.expect("raw value was not emitted"))
            }
        }
    }
}

impl serde::ser::SerializeStructVariant for SerializeStructVariant {
    type Ok = Value;
    type Error = Error;

    fn serialize_field<T>(&mut self, key: &'static str, value: &T) -> Result<()>
    where
        T: ?Sized + Serialize,
    {
        self.map.insert(String::from(key), tri!(to_value(value)));
        Ok(())
    }

    fn end(self) -> Result<Value> {
        let mut object = Map::new();

        object.insert(self.name, Value::Object(self.map));

        Ok(Value::Object(object))
    }

src/value/de.rs (line 121)

            fn visit_map<V>(self, mut visitor: V) -> Result<Value, V::Error>
            where
                V: MapAccess<'de>,
            {
                match visitor.next_key_seed(KeyClassifier)? {
                    #[cfg(feature = "arbitrary_precision")]
                    Some(KeyClass::Number) => {
                        let number: NumberFromString = visitor.next_value()?;
                        Ok(Value::Number(number.value))
                    }
                    #[cfg(feature = "raw_value")]
                    Some(KeyClass::RawValue) => {
                        let value = visitor.next_value_seed(crate::raw::BoxedFromString)?;
                        crate::from_str(value.get()).map_err(de::Error::custom)
                    }
                    Some(KeyClass::Map(first_key)) => {
                        let mut values = Map::new();

                        values.insert(first_key, tri!(visitor.next_value()));
                        while let Some((key, value)) = tri!(visitor.next_entry()) {
                            values.insert(key, value);
                        }

                        Ok(Value::Object(values))
                    }
                    None => Ok(Value::Object(Map::new())),
                }
            }

pub fn with_capacity(capacity: usize) -> Self

Makes a new empty Map with the given initial capacity.

pub fn clear(&mut self)

Clears the map, removing all values.

pub fn get<Q>(&self, key: &Q) -> Option<&Value>where
    String: Borrow<Q>,
    Q: ?Sized + Ord + Eq + Hash,

Returns a reference to the value corresponding to the key.

The key may be any borrowed form of the map’s key type, but the ordering on the borrowed form must match the ordering on the key type.

Examples found in repository

src/value/index.rs (line 86)

    fn index_into<'v>(&self, v: &'v Value) -> Option<&'v Value> {
        match v {
            Value::Object(map) => map.get(self),
            _ => None,
        }
    }

src/value/mod.rs (line 768)

    pub fn pointer(&self, pointer: &str) -> Option<&Value> {
        if pointer.is_empty() {
            return Some(self);
        }
        if !pointer.starts_with('/') {
            return None;
        }
        pointer
            .split('/')
            .skip(1)
            .map(|x| x.replace("~1", "/").replace("~0", "~"))
            .try_fold(self, |target, token| match target {
                Value::Object(map) => map.get(&token),
                Value::Array(list) => parse_index(&token).and_then(|x| list.get(x)),
                _ => None,
            })
    }

pub fn contains_key<Q>(&self, key: &Q) -> boolwhere
    String: Borrow<Q>,
    Q: ?Sized + Ord + Eq + Hash,

Returns true if the map contains a value for the specified key.

The key may be any borrowed form of the map’s key type, but the ordering on the borrowed form must match the ordering on the key type.

pub fn get_mut<Q>(&mut self, key: &Q) -> Option<&mut Value>where
    String: Borrow<Q>,
    Q: ?Sized + Ord + Eq + Hash,

Returns a mutable reference to the value corresponding to the key.

The key may be any borrowed form of the map’s key type, but the ordering on the borrowed form must match the ordering on the key type.

Examples found in repository

src/value/index.rs (line 92)

    fn index_into_mut<'v>(&self, v: &'v mut Value) -> Option<&'v mut Value> {
        match v {
            Value::Object(map) => map.get_mut(self),
            _ => None,
        }
    }

src/value/mod.rs (line 823)

    pub fn pointer_mut(&mut self, pointer: &str) -> Option<&mut Value> {
        if pointer.is_empty() {
            return Some(self);
        }
        if !pointer.starts_with('/') {
            return None;
        }
        pointer
            .split('/')
            .skip(1)
            .map(|x| x.replace("~1", "/").replace("~0", "~"))
            .try_fold(self, |target, token| match target {
                Value::Object(map) => map.get_mut(&token),
                Value::Array(list) => parse_index(&token).and_then(move |x| list.get_mut(x)),
                _ => None,
            })
    }

pub fn get_key_value<Q>(&self, key: &Q) -> Option<(&String, &Value)>where
    String: Borrow<Q>,
    Q: ?Sized + Ord + Eq + Hash,

Returns the key-value pair matching the given key.

The key may be any borrowed form of the map’s key type, but the ordering on the borrowed form must match the ordering on the key type.

pub fn insert(&mut self, k: String, v: Value) -> Option<Value>

Inserts a key-value pair into the map.

If the map did not have this key present, None is returned.

If the map did have this key present, the value is updated, and the old value is returned.

Examples found in repository

src/value/ser.rs (line 191)

    fn serialize_newtype_variant<T>(
        self,
        _name: &'static str,
        _variant_index: u32,
        variant: &'static str,
        value: &T,
    ) -> Result<Value>
    where
        T: ?Sized + Serialize,
    {
        let mut values = Map::new();
        values.insert(String::from(variant), tri!(to_value(value)));
        Ok(Value::Object(values))
    }

    #[inline]
    fn serialize_none(self) -> Result<Value> {
        self.serialize_unit()
    }

    #[inline]
    fn serialize_some<T>(self, value: &T) -> Result<Value>
    where
        T: ?Sized + Serialize,
    {
        value.serialize(self)
    }

    fn serialize_seq(self, len: Option<usize>) -> Result<Self::SerializeSeq> {
        Ok(SerializeVec {
            vec: Vec::with_capacity(len.unwrap_or(0)),
        })
    }

    fn serialize_tuple(self, len: usize) -> Result<Self::SerializeTuple> {
        self.serialize_seq(Some(len))
    }

    fn serialize_tuple_struct(
        self,
        _name: &'static str,
        len: usize,
    ) -> Result<Self::SerializeTupleStruct> {
        self.serialize_seq(Some(len))
    }

    fn serialize_tuple_variant(
        self,
        _name: &'static str,
        _variant_index: u32,
        variant: &'static str,
        len: usize,
    ) -> Result<Self::SerializeTupleVariant> {
        Ok(SerializeTupleVariant {
            name: String::from(variant),
            vec: Vec::with_capacity(len),
        })
    }

    fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap> {
        Ok(SerializeMap::Map {
            map: Map::new(),
            next_key: None,
        })
    }

    fn serialize_struct(self, name: &'static str, len: usize) -> Result<Self::SerializeStruct> {
        match name {
            #[cfg(feature = "arbitrary_precision")]
            crate::number::TOKEN => Ok(SerializeMap::Number { out_value: None }),
            #[cfg(feature = "raw_value")]
            crate::raw::TOKEN => Ok(SerializeMap::RawValue { out_value: None }),
            _ => self.serialize_map(Some(len)),
        }
    }

    fn serialize_struct_variant(
        self,
        _name: &'static str,
        _variant_index: u32,
        variant: &'static str,
        _len: usize,
    ) -> Result<Self::SerializeStructVariant> {
        Ok(SerializeStructVariant {
            name: String::from(variant),
            map: Map::new(),
        })
    }

    fn collect_str<T>(self, value: &T) -> Result<Value>
    where
        T: ?Sized + Display,
    {
        Ok(Value::String(value.to_string()))
    }
}

pub struct SerializeVec {
    vec: Vec<Value>,
}

pub struct SerializeTupleVariant {
    name: String,
    vec: Vec<Value>,
}

pub enum SerializeMap {
    Map {
        map: Map<String, Value>,
        next_key: Option<String>,
    },
    #[cfg(feature = "arbitrary_precision")]
    Number { out_value: Option<Value> },
    #[cfg(feature = "raw_value")]
    RawValue { out_value: Option<Value> },
}

pub struct SerializeStructVariant {
    name: String,
    map: Map<String, Value>,
}

impl serde::ser::SerializeSeq for SerializeVec {
    type Ok = Value;
    type Error = Error;

    fn serialize_element<T>(&mut self, value: &T) -> Result<()>
    where
        T: ?Sized + Serialize,
    {
        self.vec.push(tri!(to_value(value)));
        Ok(())
    }

    fn end(self) -> Result<Value> {
        Ok(Value::Array(self.vec))
    }
}

impl serde::ser::SerializeTuple for SerializeVec {
    type Ok = Value;
    type Error = Error;

    fn serialize_element<T>(&mut self, value: &T) -> Result<()>
    where
        T: ?Sized + Serialize,
    {
        serde::ser::SerializeSeq::serialize_element(self, value)
    }

    fn end(self) -> Result<Value> {
        serde::ser::SerializeSeq::end(self)
    }
}

impl serde::ser::SerializeTupleStruct for SerializeVec {
    type Ok = Value;
    type Error = Error;

    fn serialize_field<T>(&mut self, value: &T) -> Result<()>
    where
        T: ?Sized + Serialize,
    {
        serde::ser::SerializeSeq::serialize_element(self, value)
    }

    fn end(self) -> Result<Value> {
        serde::ser::SerializeSeq::end(self)
    }
}

impl serde::ser::SerializeTupleVariant for SerializeTupleVariant {
    type Ok = Value;
    type Error = Error;

    fn serialize_field<T>(&mut self, value: &T) -> Result<()>
    where
        T: ?Sized + Serialize,
    {
        self.vec.push(tri!(to_value(value)));
        Ok(())
    }

    fn end(self) -> Result<Value> {
        let mut object = Map::new();

        object.insert(self.name, Value::Array(self.vec));

        Ok(Value::Object(object))
    }
}

impl serde::ser::SerializeMap for SerializeMap {
    type Ok = Value;
    type Error = Error;

    fn serialize_key<T>(&mut self, key: &T) -> Result<()>
    where
        T: ?Sized + Serialize,
    {
        match self {
            SerializeMap::Map { next_key, .. } => {
                *next_key = Some(tri!(key.serialize(MapKeySerializer)));
                Ok(())
            }
            #[cfg(feature = "arbitrary_precision")]
            SerializeMap::Number { .. } => unreachable!(),
            #[cfg(feature = "raw_value")]
            SerializeMap::RawValue { .. } => unreachable!(),
        }
    }

    fn serialize_value<T>(&mut self, value: &T) -> Result<()>
    where
        T: ?Sized + Serialize,
    {
        match self {
            SerializeMap::Map { map, next_key } => {
                let key = next_key.take();
                // Panic because this indicates a bug in the program rather than an
                // expected failure.
                let key = key.expect("serialize_value called before serialize_key");
                map.insert(key, tri!(to_value(value)));
                Ok(())
            }
            #[cfg(feature = "arbitrary_precision")]
            SerializeMap::Number { .. } => unreachable!(),
            #[cfg(feature = "raw_value")]
            SerializeMap::RawValue { .. } => unreachable!(),
        }
    }

    fn end(self) -> Result<Value> {
        match self {
            SerializeMap::Map { map, .. } => Ok(Value::Object(map)),
            #[cfg(feature = "arbitrary_precision")]
            SerializeMap::Number { .. } => unreachable!(),
            #[cfg(feature = "raw_value")]
            SerializeMap::RawValue { .. } => unreachable!(),
        }
    }
}

struct MapKeySerializer;

fn key_must_be_a_string() -> Error {
    Error::syntax(ErrorCode::KeyMustBeAString, 0, 0)
}

impl serde::Serializer for MapKeySerializer {
    type Ok = String;
    type Error = Error;

    type SerializeSeq = Impossible<String, Error>;
    type SerializeTuple = Impossible<String, Error>;
    type SerializeTupleStruct = Impossible<String, Error>;
    type SerializeTupleVariant = Impossible<String, Error>;
    type SerializeMap = Impossible<String, Error>;
    type SerializeStruct = Impossible<String, Error>;
    type SerializeStructVariant = Impossible<String, Error>;

    #[inline]
    fn serialize_unit_variant(
        self,
        _name: &'static str,
        _variant_index: u32,
        variant: &'static str,
    ) -> Result<String> {
        Ok(variant.to_owned())
    }

    #[inline]
    fn serialize_newtype_struct<T>(self, _name: &'static str, value: &T) -> Result<String>
    where
        T: ?Sized + Serialize,
    {
        value.serialize(self)
    }

    fn serialize_bool(self, _value: bool) -> Result<String> {
        Err(key_must_be_a_string())
    }

    fn serialize_i8(self, value: i8) -> Result<String> {
        Ok(value.to_string())
    }

    fn serialize_i16(self, value: i16) -> Result<String> {
        Ok(value.to_string())
    }

    fn serialize_i32(self, value: i32) -> Result<String> {
        Ok(value.to_string())
    }

    fn serialize_i64(self, value: i64) -> Result<String> {
        Ok(value.to_string())
    }

    fn serialize_u8(self, value: u8) -> Result<String> {
        Ok(value.to_string())
    }

    fn serialize_u16(self, value: u16) -> Result<String> {
        Ok(value.to_string())
    }

    fn serialize_u32(self, value: u32) -> Result<String> {
        Ok(value.to_string())
    }

    fn serialize_u64(self, value: u64) -> Result<String> {
        Ok(value.to_string())
    }

    fn serialize_f32(self, _value: f32) -> Result<String> {
        Err(key_must_be_a_string())
    }

    fn serialize_f64(self, _value: f64) -> Result<String> {
        Err(key_must_be_a_string())
    }

    #[inline]
    fn serialize_char(self, value: char) -> Result<String> {
        Ok({
            let mut s = String::new();
            s.push(value);
            s
        })
    }

    #[inline]
    fn serialize_str(self, value: &str) -> Result<String> {
        Ok(value.to_owned())
    }

    fn serialize_bytes(self, _value: &[u8]) -> Result<String> {
        Err(key_must_be_a_string())
    }

    fn serialize_unit(self) -> Result<String> {
        Err(key_must_be_a_string())
    }

    fn serialize_unit_struct(self, _name: &'static str) -> Result<String> {
        Err(key_must_be_a_string())
    }

    fn serialize_newtype_variant<T>(
        self,
        _name: &'static str,
        _variant_index: u32,
        _variant: &'static str,
        _value: &T,
    ) -> Result<String>
    where
        T: ?Sized + Serialize,
    {
        Err(key_must_be_a_string())
    }

    fn serialize_none(self) -> Result<String> {
        Err(key_must_be_a_string())
    }

    fn serialize_some<T>(self, _value: &T) -> Result<String>
    where
        T: ?Sized + Serialize,
    {
        Err(key_must_be_a_string())
    }

    fn serialize_seq(self, _len: Option<usize>) -> Result<Self::SerializeSeq> {
        Err(key_must_be_a_string())
    }

    fn serialize_tuple(self, _len: usize) -> Result<Self::SerializeTuple> {
        Err(key_must_be_a_string())
    }

    fn serialize_tuple_struct(
        self,
        _name: &'static str,
        _len: usize,
    ) -> Result<Self::SerializeTupleStruct> {
        Err(key_must_be_a_string())
    }

    fn serialize_tuple_variant(
        self,
        _name: &'static str,
        _variant_index: u32,
        _variant: &'static str,
        _len: usize,
    ) -> Result<Self::SerializeTupleVariant> {
        Err(key_must_be_a_string())
    }

    fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap> {
        Err(key_must_be_a_string())
    }

    fn serialize_struct(self, _name: &'static str, _len: usize) -> Result<Self::SerializeStruct> {
        Err(key_must_be_a_string())
    }

    fn serialize_struct_variant(
        self,
        _name: &'static str,
        _variant_index: u32,
        _variant: &'static str,
        _len: usize,
    ) -> Result<Self::SerializeStructVariant> {
        Err(key_must_be_a_string())
    }

    fn collect_str<T>(self, value: &T) -> Result<String>
    where
        T: ?Sized + Display,
    {
        Ok(value.to_string())
    }
}

impl serde::ser::SerializeStruct for SerializeMap {
    type Ok = Value;
    type Error = Error;

    fn serialize_field<T>(&mut self, key: &'static str, value: &T) -> Result<()>
    where
        T: ?Sized + Serialize,
    {
        match self {
            SerializeMap::Map { .. } => serde::ser::SerializeMap::serialize_entry(self, key, value),
            #[cfg(feature = "arbitrary_precision")]
            SerializeMap::Number { out_value } => {
                if key == crate::number::TOKEN {
                    *out_value = Some(value.serialize(NumberValueEmitter)?);
                    Ok(())
                } else {
                    Err(invalid_number())
                }
            }
            #[cfg(feature = "raw_value")]
            SerializeMap::RawValue { out_value } => {
                if key == crate::raw::TOKEN {
                    *out_value = Some(value.serialize(RawValueEmitter)?);
                    Ok(())
                } else {
                    Err(invalid_raw_value())
                }
            }
        }
    }

    fn end(self) -> Result<Value> {
        match self {
            SerializeMap::Map { .. } => serde::ser::SerializeMap::end(self),
            #[cfg(feature = "arbitrary_precision")]
            SerializeMap::Number { out_value, .. } => {
                Ok(out_value.expect("number value was not emitted"))
            }
            #[cfg(feature = "raw_value")]
            SerializeMap::RawValue { out_value, .. } => {
                Ok(out_value.expect("raw value was not emitted"))
            }
        }
    }
}

impl serde::ser::SerializeStructVariant for SerializeStructVariant {
    type Ok = Value;
    type Error = Error;

    fn serialize_field<T>(&mut self, key: &'static str, value: &T) -> Result<()>
    where
        T: ?Sized + Serialize,
    {
        self.map.insert(String::from(key), tri!(to_value(value)));
        Ok(())
    }

    fn end(self) -> Result<Value> {
        let mut object = Map::new();

        object.insert(self.name, Value::Object(self.map));

        Ok(Value::Object(object))
    }

src/map.rs (line 426)

            fn visit_map<V>(self, mut visitor: V) -> Result<Self::Value, V::Error>
            where
                V: de::MapAccess<'de>,
            {
                let mut values = Map::new();

                while let Some((key, value)) = tri!(visitor.next_entry()) {
                    values.insert(key, value);
                }

                Ok(values)
            }

src/value/de.rs (line 123)

            fn visit_map<V>(self, mut visitor: V) -> Result<Value, V::Error>
            where
                V: MapAccess<'de>,
            {
                match visitor.next_key_seed(KeyClassifier)? {
                    #[cfg(feature = "arbitrary_precision")]
                    Some(KeyClass::Number) => {
                        let number: NumberFromString = visitor.next_value()?;
                        Ok(Value::Number(number.value))
                    }
                    #[cfg(feature = "raw_value")]
                    Some(KeyClass::RawValue) => {
                        let value = visitor.next_value_seed(crate::raw::BoxedFromString)?;
                        crate::from_str(value.get()).map_err(de::Error::custom)
                    }
                    Some(KeyClass::Map(first_key)) => {
                        let mut values = Map::new();

                        values.insert(first_key, tri!(visitor.next_value()));
                        while let Some((key, value)) = tri!(visitor.next_entry()) {
                            values.insert(key, value);
                        }

                        Ok(Value::Object(values))
                    }
                    None => Ok(Value::Object(Map::new())),
                }
            }

pub fn remove<Q>(&mut self, key: &Q) -> Option<Value>where
    String: Borrow<Q>,
    Q: ?Sized + Ord + Eq + Hash,

Removes a key from the map, returning the value at the key if the key was previously in the map.

The key may be any borrowed form of the map’s key type, but the ordering on the borrowed form must match the ordering on the key type.

pub fn remove_entry<Q>(&mut self, key: &Q) -> Option<(String, Value)>where
    String: Borrow<Q>,
    Q: ?Sized + Ord + Eq + Hash,

Removes a key from the map, returning the stored key and value if the key was previously in the map.

The key may be any borrowed form of the map’s key type, but the ordering on the borrowed form must match the ordering on the key type.

pub fn append(&mut self, other: &mut Self)

Moves all elements from other into self, leaving other empty.

pub fn entry<S>(&mut self, key: S) -> Entry<'_>where
    S: Into<String>,

Gets the given key’s corresponding entry in the map for in-place manipulation.

Examples found in repository

src/value/index.rs (line 101)

    fn index_or_insert<'v>(&self, v: &'v mut Value) -> &'v mut Value {
        if let Value::Null = v {
            *v = Value::Object(Map::new());
        }
        match v {
            Value::Object(map) => map.entry(self.to_owned()).or_insert(Value::Null),
            _ => panic!("cannot access key {:?} in JSON {}", self, Type(v)),
        }
    }

pub fn len(&self) -> usize

Returns the number of elements in the map.

Examples found in repository

src/map.rs (line 386)

    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: serde::ser::Serializer,
    {
        use serde::ser::SerializeMap;
        let mut map = tri!(serializer.serialize_map(Some(self.len())));
        for (k, v) in self {
            tri!(map.serialize_entry(k, v));
        }
        map.end()
    }

src/value/de.rs (line 194)

fn visit_object<'de, V>(object: Map<String, Value>, visitor: V) -> Result<V::Value, Error>
where
    V: Visitor<'de>,
{
    let len = object.len();
    let mut deserializer = MapDeserializer::new(object);
    let map = tri!(visitor.visit_map(&mut deserializer));
    let remaining = deserializer.iter.len();
    if remaining == 0 {
        Ok(map)
    } else {
        Err(serde::de::Error::invalid_length(
            len,
            &"fewer elements in map",
        ))
    }
}

impl<'de> serde::Deserializer<'de> for Value {
    type Error = Error;

    #[inline]
    fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Error>
    where
        V: Visitor<'de>,
    {
        match self {
            Value::Null => visitor.visit_unit(),
            Value::Bool(v) => visitor.visit_bool(v),
            Value::Number(n) => n.deserialize_any(visitor),
            #[cfg(any(feature = "std", feature = "alloc"))]
            Value::String(v) => visitor.visit_string(v),
            Value::Array(v) => visit_array(v, visitor),
            Value::Object(v) => visit_object(v, visitor),
        }
    }

    deserialize_number!(deserialize_i8);
    deserialize_number!(deserialize_i16);
    deserialize_number!(deserialize_i32);
    deserialize_number!(deserialize_i64);
    deserialize_number!(deserialize_i128);
    deserialize_number!(deserialize_u8);
    deserialize_number!(deserialize_u16);
    deserialize_number!(deserialize_u32);
    deserialize_number!(deserialize_u64);
    deserialize_number!(deserialize_u128);
    deserialize_number!(deserialize_f32);
    deserialize_number!(deserialize_f64);

    #[inline]
    fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, Error>
    where
        V: Visitor<'de>,
    {
        match self {
            Value::Null => visitor.visit_none(),
            _ => visitor.visit_some(self),
        }
    }

    #[inline]
    fn deserialize_enum<V>(
        self,
        _name: &str,
        _variants: &'static [&'static str],
        visitor: V,
    ) -> Result<V::Value, Error>
    where
        V: Visitor<'de>,
    {
        let (variant, value) = match self {
            Value::Object(value) => {
                let mut iter = value.into_iter();
                let (variant, value) = match iter.next() {
                    Some(v) => v,
                    None => {
                        return Err(serde::de::Error::invalid_value(
                            Unexpected::Map,
                            &"map with a single key",
                        ));
                    }
                };
                // enums are encoded in json as maps with a single key:value pair
                if iter.next().is_some() {
                    return Err(serde::de::Error::invalid_value(
                        Unexpected::Map,
                        &"map with a single key",
                    ));
                }
                (variant, Some(value))
            }
            Value::String(variant) => (variant, None),
            other => {
                return Err(serde::de::Error::invalid_type(
                    other.unexpected(),
                    &"string or map",
                ));
            }
        };

        visitor.visit_enum(EnumDeserializer { variant, value })
    }

    #[inline]
    fn deserialize_newtype_struct<V>(
        self,
        name: &'static str,
        visitor: V,
    ) -> Result<V::Value, Error>
    where
        V: Visitor<'de>,
    {
        #[cfg(feature = "raw_value")]
        {
            if name == crate::raw::TOKEN {
                return visitor.visit_map(crate::raw::OwnedRawDeserializer {
                    raw_value: Some(self.to_string()),
                });
            }
        }

        let _ = name;
        visitor.visit_newtype_struct(self)
    }

    fn deserialize_bool<V>(self, visitor: V) -> Result<V::Value, Error>
    where
        V: Visitor<'de>,
    {
        match self {
            Value::Bool(v) => visitor.visit_bool(v),
            _ => Err(self.invalid_type(&visitor)),
        }
    }

    fn deserialize_char<V>(self, visitor: V) -> Result<V::Value, Error>
    where
        V: Visitor<'de>,
    {
        self.deserialize_string(visitor)
    }

    fn deserialize_str<V>(self, visitor: V) -> Result<V::Value, Error>
    where
        V: Visitor<'de>,
    {
        self.deserialize_string(visitor)
    }

    fn deserialize_string<V>(self, visitor: V) -> Result<V::Value, Error>
    where
        V: Visitor<'de>,
    {
        match self {
            #[cfg(any(feature = "std", feature = "alloc"))]
            Value::String(v) => visitor.visit_string(v),
            _ => Err(self.invalid_type(&visitor)),
        }
    }

    fn deserialize_bytes<V>(self, visitor: V) -> Result<V::Value, Error>
    where
        V: Visitor<'de>,
    {
        self.deserialize_byte_buf(visitor)
    }

    fn deserialize_byte_buf<V>(self, visitor: V) -> Result<V::Value, Error>
    where
        V: Visitor<'de>,
    {
        match self {
            #[cfg(any(feature = "std", feature = "alloc"))]
            Value::String(v) => visitor.visit_string(v),
            Value::Array(v) => visit_array(v, visitor),
            _ => Err(self.invalid_type(&visitor)),
        }
    }

    fn deserialize_unit<V>(self, visitor: V) -> Result<V::Value, Error>
    where
        V: Visitor<'de>,
    {
        match self {
            Value::Null => visitor.visit_unit(),
            _ => Err(self.invalid_type(&visitor)),
        }
    }

    fn deserialize_unit_struct<V>(self, _name: &'static str, visitor: V) -> Result<V::Value, Error>
    where
        V: Visitor<'de>,
    {
        self.deserialize_unit(visitor)
    }

    fn deserialize_seq<V>(self, visitor: V) -> Result<V::Value, Error>
    where
        V: Visitor<'de>,
    {
        match self {
            Value::Array(v) => visit_array(v, visitor),
            _ => Err(self.invalid_type(&visitor)),
        }
    }

    fn deserialize_tuple<V>(self, _len: usize, visitor: V) -> Result<V::Value, Error>
    where
        V: Visitor<'de>,
    {
        self.deserialize_seq(visitor)
    }

    fn deserialize_tuple_struct<V>(
        self,
        _name: &'static str,
        _len: usize,
        visitor: V,
    ) -> Result<V::Value, Error>
    where
        V: Visitor<'de>,
    {
        self.deserialize_seq(visitor)
    }

    fn deserialize_map<V>(self, visitor: V) -> Result<V::Value, Error>
    where
        V: Visitor<'de>,
    {
        match self {
            Value::Object(v) => visit_object(v, visitor),
            _ => Err(self.invalid_type(&visitor)),
        }
    }

    fn deserialize_struct<V>(
        self,
        _name: &'static str,
        _fields: &'static [&'static str],
        visitor: V,
    ) -> Result<V::Value, Error>
    where
        V: Visitor<'de>,
    {
        match self {
            Value::Array(v) => visit_array(v, visitor),
            Value::Object(v) => visit_object(v, visitor),
            _ => Err(self.invalid_type(&visitor)),
        }
    }

    fn deserialize_identifier<V>(self, visitor: V) -> Result<V::Value, Error>
    where
        V: Visitor<'de>,
    {
        self.deserialize_string(visitor)
    }

    fn deserialize_ignored_any<V>(self, visitor: V) -> Result<V::Value, Error>
    where
        V: Visitor<'de>,
    {
        drop(self);
        visitor.visit_unit()
    }
}

struct EnumDeserializer {
    variant: String,
    value: Option<Value>,
}

impl<'de> EnumAccess<'de> for EnumDeserializer {
    type Error = Error;
    type Variant = VariantDeserializer;

    fn variant_seed<V>(self, seed: V) -> Result<(V::Value, VariantDeserializer), Error>
    where
        V: DeserializeSeed<'de>,
    {
        let variant = self.variant.into_deserializer();
        let visitor = VariantDeserializer { value: self.value };
        seed.deserialize(variant).map(|v| (v, visitor))
    }
}

impl<'de> IntoDeserializer<'de, Error> for Value {
    type Deserializer = Self;

    fn into_deserializer(self) -> Self::Deserializer {
        self
    }
}

struct VariantDeserializer {
    value: Option<Value>,
}

impl<'de> VariantAccess<'de> for VariantDeserializer {
    type Error = Error;

    fn unit_variant(self) -> Result<(), Error> {
        match self.value {
            Some(value) => Deserialize::deserialize(value),
            None => Ok(()),
        }
    }

    fn newtype_variant_seed<T>(self, seed: T) -> Result<T::Value, Error>
    where
        T: DeserializeSeed<'de>,
    {
        match self.value {
            Some(value) => seed.deserialize(value),
            None => Err(serde::de::Error::invalid_type(
                Unexpected::UnitVariant,
                &"newtype variant",
            )),
        }
    }

    fn tuple_variant<V>(self, _len: usize, visitor: V) -> Result<V::Value, Error>
    where
        V: Visitor<'de>,
    {
        match self.value {
            Some(Value::Array(v)) => {
                if v.is_empty() {
                    visitor.visit_unit()
                } else {
                    visit_array(v, visitor)
                }
            }
            Some(other) => Err(serde::de::Error::invalid_type(
                other.unexpected(),
                &"tuple variant",
            )),
            None => Err(serde::de::Error::invalid_type(
                Unexpected::UnitVariant,
                &"tuple variant",
            )),
        }
    }

    fn struct_variant<V>(
        self,
        _fields: &'static [&'static str],
        visitor: V,
    ) -> Result<V::Value, Error>
    where
        V: Visitor<'de>,
    {
        match self.value {
            Some(Value::Object(v)) => visit_object(v, visitor),
            Some(other) => Err(serde::de::Error::invalid_type(
                other.unexpected(),
                &"struct variant",
            )),
            None => Err(serde::de::Error::invalid_type(
                Unexpected::UnitVariant,
                &"struct variant",
            )),
        }
    }
}

struct SeqDeserializer {
    iter: vec::IntoIter<Value>,
}

impl SeqDeserializer {
    fn new(vec: Vec<Value>) -> Self {
        SeqDeserializer {
            iter: vec.into_iter(),
        }
    }
}

impl<'de> SeqAccess<'de> for SeqDeserializer {
    type Error = Error;

    fn next_element_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Error>
    where
        T: DeserializeSeed<'de>,
    {
        match self.iter.next() {
            Some(value) => seed.deserialize(value).map(Some),
            None => Ok(None),
        }
    }

    fn size_hint(&self) -> Option<usize> {
        match self.iter.size_hint() {
            (lower, Some(upper)) if lower == upper => Some(upper),
            _ => None,
        }
    }
}

struct MapDeserializer {
    iter: <Map<String, Value> as IntoIterator>::IntoIter,
    value: Option<Value>,
}

impl MapDeserializer {
    fn new(map: Map<String, Value>) -> Self {
        MapDeserializer {
            iter: map.into_iter(),
            value: None,
        }
    }
}

impl<'de> MapAccess<'de> for MapDeserializer {
    type Error = Error;

    fn next_key_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Error>
    where
        T: DeserializeSeed<'de>,
    {
        match self.iter.next() {
            Some((key, value)) => {
                self.value = Some(value);
                let key_de = MapKeyDeserializer {
                    key: Cow::Owned(key),
                };
                seed.deserialize(key_de).map(Some)
            }
            None => Ok(None),
        }
    }

    fn next_value_seed<T>(&mut self, seed: T) -> Result<T::Value, Error>
    where
        T: DeserializeSeed<'de>,
    {
        match self.value.take() {
            Some(value) => seed.deserialize(value),
            None => Err(serde::de::Error::custom("value is missing")),
        }
    }

    fn size_hint(&self) -> Option<usize> {
        match self.iter.size_hint() {
            (lower, Some(upper)) if lower == upper => Some(upper),
            _ => None,
        }
    }
}

macro_rules! deserialize_value_ref_number {
    ($method:ident) => {
        #[cfg(not(feature = "arbitrary_precision"))]
        fn $method<V>(self, visitor: V) -> Result<V::Value, Error>
        where
            V: Visitor<'de>,
        {
            match self {
                Value::Number(n) => n.deserialize_any(visitor),
                _ => Err(self.invalid_type(&visitor)),
            }
        }

        #[cfg(feature = "arbitrary_precision")]
        fn $method<V>(self, visitor: V) -> Result<V::Value, Error>
        where
            V: Visitor<'de>,
        {
            match self {
                Value::Number(n) => n.$method(visitor),
                _ => self.deserialize_any(visitor),
            }
        }
    };
}

fn visit_array_ref<'de, V>(array: &'de [Value], visitor: V) -> Result<V::Value, Error>
where
    V: Visitor<'de>,
{
    let len = array.len();
    let mut deserializer = SeqRefDeserializer::new(array);
    let seq = tri!(visitor.visit_seq(&mut deserializer));
    let remaining = deserializer.iter.len();
    if remaining == 0 {
        Ok(seq)
    } else {
        Err(serde::de::Error::invalid_length(
            len,
            &"fewer elements in array",
        ))
    }
}

fn visit_object_ref<'de, V>(object: &'de Map<String, Value>, visitor: V) -> Result<V::Value, Error>
where
    V: Visitor<'de>,
{
    let len = object.len();
    let mut deserializer = MapRefDeserializer::new(object);
    let map = tri!(visitor.visit_map(&mut deserializer));
    let remaining = deserializer.iter.len();
    if remaining == 0 {
        Ok(map)
    } else {
        Err(serde::de::Error::invalid_length(
            len,
            &"fewer elements in map",
        ))
    }
}

src/value/ser.rs (line 27)

    fn serialize<S>(&self, serializer: S) -> result::Result<S::Ok, S::Error>
    where
        S: ::serde::Serializer,
    {
        match self {
            Value::Null => serializer.serialize_unit(),
            Value::Bool(b) => serializer.serialize_bool(*b),
            Value::Number(n) => n.serialize(serializer),
            Value::String(s) => serializer.serialize_str(s),
            Value::Array(v) => v.serialize(serializer),
            #[cfg(any(feature = "std", feature = "alloc"))]
            Value::Object(m) => {
                use serde::ser::SerializeMap;
                let mut map = tri!(serializer.serialize_map(Some(m.len())));
                for (k, v) in m {
                    tri!(map.serialize_entry(k, v));
                }
                map.end()
            }
        }
    }

pub fn is_empty(&self) -> bool

Returns true if the map contains no elements.

pub fn iter(&self) -> Iter<'_>

Gets an iterator over the entries of the map.

pub fn iter_mut(&mut self) -> IterMut<'_>

Gets a mutable iterator over the entries of the map.

pub fn keys(&self) -> Keys<'_>

Gets an iterator over the keys of the map.

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

Gets an iterator over the values of the map.

pub fn values_mut(&mut self) -> ValuesMut<'_>

Gets an iterator over mutable values of the map.

pub fn retain<F>(&mut self, f: F)where
    F: FnMut(&String, &mut Value) -> bool,

Retains only the elements specified by the predicate.

In other words, remove all pairs (k, v) such that f(&k, &mut v) returns false.

Trait Implementations

impl Clone for Map<String, Value>

fn clone(&self) -> Self

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Map<String, Value>

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

Formats the value using the given formatter.

impl Default for Map<String, Value>

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Map<String, Value>

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

Deserialize this value from the given Serde deserializer.

impl Extend<(String, Value)> for Map<String, Value>

fn extend<T>(&mut self, iter: T)where
    T: IntoIterator<Item = (String, Value)>,

Extends a collection with the contents of an iterator.

fn extend_one(&mut self, item: A)

🔬This is a nightly-only experimental API. (extend_one)

Extends a collection with exactly one element.

fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (extend_one)

Reserves capacity in a collection for the given number of additional elements.

impl From<Map<String, Value>> for Value

fn from(f: Map<String, Value>) -> Self

Convert map (with string keys) to Value

Examples

use serde_json::{Map, Value};

let mut m = Map::new();
m.insert("Lorem".to_string(), "ipsum".into());
let x: Value = m.into();

impl FromIterator<(String, Value)> for Map<String, Value>

fn from_iter<T>(iter: T) -> Selfwhere
    T: IntoIterator<Item = (String, Value)>,

Creates a value from an iterator.

impl<'a, Q> Index<&'a Q> for Map<String, Value>where
    String: Borrow<Q>,
    Q: ?Sized + Ord + Eq + Hash,

Access an element of this map. Panics if the given key is not present in the map.

match val {
    Value::String(s) => Some(s.as_str()),
    Value::Array(arr) => arr[0].as_str(),
    Value::Object(map) => map["type"].as_str(),
    _ => None,
}

type Output = Value

The returned type after indexing.

fn index(&self, index: &Q) -> &Value

Performs the indexing (container[index]) operation.

impl<'a, Q> IndexMut<&'a Q> for Map<String, Value>where
    String: Borrow<Q>,
    Q: ?Sized + Ord + Eq + Hash,

Mutably access an element of this map. Panics if the given key is not present in the map.

map["key"] = json!("value");

fn index_mut(&mut self, index: &Q) -> &mut Value

Performs the mutable indexing (container[index]) operation.

impl<'a> IntoIterator for &'a Map<String, Value>

type Item = (&'a String, &'a Value)

The type of the elements being iterated over.

type IntoIter = Iter<'a>

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl<'a> IntoIterator for &'a mut Map<String, Value>

type Item = (&'a String, &'a mut Value)

The type of the elements being iterated over.

type IntoIter = IterMut<'a>

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl IntoIterator for Map<String, Value>

type Item = (String, Value)

The type of the elements being iterated over.

type IntoIter = IntoIter

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl PartialEq<Map<String, Value>> for Map<String, Value>

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

This method tests for self and other values to be equal, and is used by ==.

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

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

impl Serialize for Map<String, Value>

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

Serialize this value into the given Serde serializer.

impl Eq for Map<String, Value>