Enum jmespath::Variable

pub enum Variable {
    Null,
    String(String),
    Bool(bool),
    Number(f64),
    Array(Vec<Rcvar>),
    Object(BTreeMap<String, Rcvar>),
    Expref(Ast),
}

JMESPath variable.

Variants

NullString(String)Bool(bool)Number(f64)Array(Vec<Rcvar>)Object(BTreeMap<String, Rcvar>)Expref(Ast)

Methods

impl Variable

fn from_json(s: &str) -> Result<Self, String>

Create a JMESPath Variable from a JSON encoded string.

fn is_array(&self) -> bool

Returns true if the Variable is an Array. Returns false otherwise.

fn as_array(&self) -> Option<&Vec<Rcvar>>

If the Variable value is an Array, returns the associated vector. Returns None otherwise.

fn is_object(&self) -> bool

Returns true if the value is an Object.

fn as_object(&self) -> Option<&BTreeMap<String, Rcvar>>

If the value is an Object, returns the associated BTreeMap. Returns None otherwise.

fn is_string(&self) -> bool

Returns true if the value is a String. Returns false otherwise.

fn as_string(&self) -> Option<&String>

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 as_number(&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.

fn is_expref(&self) -> bool

Returns true if the value is an expression reference. Returns false otherwise.

fn as_expref(&self) -> Option<&Ast>

If the value is an expression reference, returns the associated Ast node. Returns None otherwise.

fn get_field(&self, key: &str) -> Rcvar

If the value is an object, returns the value associated with the provided key. Otherwise, returns Null.

fn get_index(&self, index: usize) -> Rcvar

If the value is an array, then gets an array value by index. Otherwise returns Null.

fn get_negative_index(&self, index: usize) -> Rcvar

Retrieves an index from the end of an array.

Returns Null if not an array or if the index is not present. The formula for determining the index position is length - index (i.e., an index of 0 or 1 is treated as the end of the array).

fn is_truthy(&self) -> bool

Returns true or false based on if the Variable value is considered truthy.

fn get_type(&self) -> JmespathType

Returns the JMESPath type name of a Variable value.

fn compare(&self, cmp: &Comparator, value: &Variable) -> Option<bool>

Compares two Variable values using a comparator.

fn slice(
    &self,
    start: &Option<i32>,
    stop: &Option<i32>,
    step: i32
) -> Option<Vec<Rcvar>>

Returns a slice of the variable if the variable is an array.

Trait Implementations

impl Clone for Variable

fn clone(&self) -> Variable

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Variable

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.

impl Eq for Variable

impl PartialEq for Variable

Implement PartialEq for looser floating point comparisons.

fn eq(&self, other: &Variable) -> 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 !=.

impl PartialOrd<Variable> for Variable

Implement PartialOrd so that Ast can be in the PartialOrd of Variable.

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

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

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

This method tests less than (for self and other) and is used by the < operator.

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

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

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

This method tests greater than (for self and other) and is used by the > operator.

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

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

impl Ord for Variable

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

This method returns an Ordering between self and other.

impl Display for Variable

Write the JSON representation of a value, converting expref to a JSON string containing the debug dump of the expref variable.

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

Formats the value using the given formatter.

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

Convert a borrowed Value to a Variable.

fn from(value: &'a Value) -> Variable

Performs the conversion.

impl From<Value> for Variable

Slightly optimized method for converting from an owned Value.

fn from(value: Value) -> Variable

Performs the conversion.

impl Deserialize for Variable

Serde deserialization for Variable

fn deserialize<D>(deserializer: &mut D) -> Result<Variable, D::Error> where
    D: Deserializer, 

Deserialize this value given this Deserializer.

impl Serialize for Variable

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

Serializes this value into this serializer.