Struct eval::Expr

pub struct Expr { /* fields omitted */ }

Expression builder

Methods

impl Expr

pub fn new<T: Into<String>>(expr: T) -> Expr

Create an expression.

pub fn function<T, F>(self, name: T, function: F) -> Expr where     T: Into<String>,     F: 'static + Fn(Vec<Value>) -> Result<Value, Error> + Sync + Send,

Set function.

pub fn value<T, V>(self, name: T, value: V) -> Expr where     T: Into<String>,     V: Serialize,

Set value.

pub fn compile(self) -> Result<Expr, Error>

Compile an expression. An expression can be compiled only once and then invoked multiple times with different context and function. You can also execute a expression without compile.

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

Execute the expression.

Trait Implementations

impl Clone for Expr

fn clone(&self) -> Expr

Returns a copy of the value. Notice that functions can not be cloned. The cloned expr's functions will be empty.

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

Performs copy-assignment from source.

impl Debug for Expr

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

Formats the value using the given formatter.