Enum serde_json::value::Value
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pub enum Value { Null, Bool(bool), I64(i64), U64(u64), F64(f64), String(String), Array(Vec<Value>), Object(Map<String, Value>), }
Represents a JSON value
Variants
Null
Represents a JSON null value
Bool(bool)
Represents a JSON Boolean
I64(i64)
Represents a JSON signed integer
U64(u64)
Represents a JSON unsigned integer
F64(f64)
Represents a JSON floating point number
String(String)
Represents a JSON string
Array(Vec<Value>)
Represents a JSON array
Object(Map<String, Value>)
Represents a JSON object
Methods
impl Value
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fn find<'a>(&'a self, key: &str) -> Option<&'a Value>
If the Value
is an Object, returns the value associated with the provided key. Otherwise, returns None.
fn find_path<'a>(&'a self, keys: &[&str]) -> Option<&'a Value>
Attempts to get a nested Value Object for each key in keys
. If any key is found not to exist, find_path will return None. Otherwise, it will return the Value
associated with the final key.
fn lookup<'a>(&'a self, path: &str) -> Option<&'a Value>
Deprecated: Use Value.pointer()
and pointer syntax instead.
Looks up a value by path.
This is a convenience method that splits the path by '.'
and then feeds the sequence of keys into the find_path
method.
let obj: Value = json::from_str(r#"{"x": {"a": 1}}"#).unwrap(); assert!(obj.lookup("x.a").unwrap() == &Value::U64(1));
fn pointer<'a>(&'a self, pointer: &str) -> Option<&'a Value>
Looks up a value by a JSON Pointer.
JSON Pointer defines a string syntax for identifying a specific value within a JavaScript Object Notation (JSON) document.
A Pointer is a Unicode string with the reference tokens separated by /
. Inside tokens /
is replaced by ~1
and ~
is replaced by ~0
. The addressed value is returned and if there is no such value None
is returned.
For more information read RFC6901.
fn search<'a>(&'a self, key: &str) -> Option<&'a Value>
If the Value
is an Object, performs a depth-first search until a value associated with the provided key is found. If no value is found or the Value
is not an Object, returns None.
fn is_object(&self) -> bool
Returns true if the Value
is an Object. Returns false otherwise.
fn as_object(&self) -> Option<&Map<String, Value>>
If the Value
is an Object, returns the associated Map. Returns None otherwise.
fn as_object_mut(&mut self) -> Option<&mut Map<String, Value>>
If the Value
is an Object, returns the associated mutable Map. Returns None otherwise.
fn is_array(&self) -> bool
Returns true if the Value
is an Array. Returns false otherwise.
fn as_array(&self) -> Option<&Vec<Value>>
If the Value
is an Array, returns the associated vector. Returns None otherwise.
fn as_array_mut(&mut self) -> Option<&mut Vec<Value>>
If the Value
is an Array, returns the associated mutable vector. Returns None otherwise.
fn is_string(&self) -> bool
Returns true if the Value
is a String. Returns false otherwise.
fn as_str(&self) -> Option<&str>
If the Value
is a String, returns the associated str. Returns None otherwise.
fn is_number(&self) -> bool
Returns true if the Value
is a Number. Returns false otherwise.
fn is_i64(&self) -> bool
Returns true if the Value
is a i64. Returns false otherwise.
fn is_u64(&self) -> bool
Returns true if the Value
is a u64. Returns false otherwise.
fn is_f64(&self) -> bool
Returns true if the Value
is a f64. Returns false otherwise.
fn as_i64(&self) -> Option<i64>
If the Value
is a number, return or cast it to a i64. Returns None otherwise.
fn as_u64(&self) -> Option<u64>
If the Value
is a number, return or cast it to a u64. Returns None otherwise.
fn as_f64(&self) -> Option<f64>
If the Value
is a number, return or cast it to a f64. Returns None otherwise.
fn is_boolean(&self) -> bool
Returns true if the Value
is a Boolean. Returns false otherwise.
fn as_bool(&self) -> Option<bool>
If the Value
is a Boolean, returns the associated bool. Returns None otherwise.
fn is_null(&self) -> bool
Returns true if the Value
is a Null. Returns false otherwise.
fn as_null(&self) -> Option<()>
If the Value
is a Null, returns (). Returns None otherwise.
Trait Implementations
impl Clone for Value
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fn clone(&self) -> Value
Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
1.0.0
Performs copy-assignment from source
. Read more
impl PartialEq for Value
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fn eq(&self, __arg_0: &Value) -> bool
This method tests for self
and other
values to be equal, and is used by ==
. Read more
fn ne(&self, __arg_0: &Value) -> bool
This method tests for !=
.
impl Serialize for Value
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fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error> where S: Serializer
Serializes this value into this serializer.
impl Deserialize for Value
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fn deserialize<D>(deserializer: &mut D) -> Result<Value, D::Error> where D: Deserializer
Deserialize this value given this Deserializer
.