Enum serde_json::value::Value
[−]
[src]
pub enum Value {
Null,
Bool(bool),
I64(i64),
U64(u64),
F64(f64),
String(String),
Array(Vec<Value>),
Object(BTreeMap<String, Value>),
}Represents a JSON value
Variants
Null | Represents a JSON numm value | |
Bool | Represents a JSON array | |
I64 | Represents a JSON signed integer | |
U64 | Represents a JSON unsigned integer | |
F64 | Represents a JSON floating point number | |
String | Represents a JSON string | |
Array | Represents a JSON array | |
Object | Represents a JSON object |
Methods
impl Value
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>
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 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<'a>(&'a self) -> bool
Returns true if the Value is an Object. Returns false otherwise.
fn as_object<'a>(&'a self) -> Option<&'a BTreeMap<String, Value>>
If the Value is an Object, returns the associated BTreeMap.
Returns None otherwise.
fn as_object_mut<'a>(&'a mut self) -> Option<&'a mut BTreeMap<String, Value>>
If the Value is an Object, returns the associated mutable BTreeMap.
Returns None otherwise.
fn is_array<'a>(&'a self) -> bool
Returns true if the Value is an Array. Returns false otherwise.
fn as_array<'a>(&'a self) -> Option<&'a Vec<Value>>
If the Value is an Array, returns the associated vector.
Returns None otherwise.
fn as_array_mut<'a>(&'a mut self) -> Option<&'a mut Vec<Value>>
If the Value is an Array, returns the associated mutable vector.
Returns None otherwise.
fn is_string<'a>(&'a self) -> bool
Returns true if the Value is a String. Returns false otherwise.
fn as_string<'a>(&'a self) -> Option<&'a 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_boolean(&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.