Struct ExprDef 

pub struct ExprDef;

Parses a RPN expression and saves it to a function variable.

Syntax

Expressions are defined using Reverse Polish Notation. For example, 1 2 + -> 3.

Each operator or number (generally called a node) must be separated by at least one whitespace character. Also supported is the node $N, for input values, and #<ident>, which allows calling other expressions inside of an expression.

Calling an expression will pop its required arguments from the stack. For example, [expr.def/inc/1 +][expr.call/inc/5] -> 6.

Supported Operators

• **: Exponent
• log: Log of arg 1 with base of arg 2
• abs: Absolute value
• <=>: Three-way comparison
• !=: Not equal
• ==: Equal
• <=: Less or equal
• >=: Greater or equal
• <<: Left shift
• >>: Logical right shift
• >>>: Arithmetic right shift
• <: Less
• >: Greater
• +: Add
• -: Subtract
• *: Multiply
• /: Divide
• %: Modulus
• ~: Negate
• ?: Ternary (if first argument is nonzero, choose first argument, otherwise choose second argument)
• &: Bitwise AND
• |: Bitwise OR
• ^: Bitwise XOR
• !: Bitwise NOT
• sin: Sine
• cos: Cosine
• tan: Tangent
• asin: Arcsine
• acos: Arccosine
• atan: Arctangent
• real: Real component of complex number
• imag: Imaginary component of complex number
• arg: Argument of complex number

Arguments

1. The name to save the expression under. 2… The expression

Trait Implementations

impl Clone for ExprDef

fn clone(&self) -> ExprDef

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Macro for ExprDef

fn name(&self) -> &[u8]

The macro’s defined name.

fn description(&self) -> &str

The macro’s description.

fn eval<'arg, 'reg: 'arg, 'exec: 'reg>( &self, _x: &'exec Executor, v: &'reg mut VariableRegistry, _r: &mut Xoshiro128PlusPlus, args: &mut dyn Iterator<Item = &'arg [u8]>, ) -> Result<Cow<'static, [u8]>, MacroError>

Evaluates the macro.

fn clone(&self) -> Box<dyn Macro>

Clones this macro into a box;

fn source(&self) -> &[u8]

The macro’s source code.

impl Copy for ExprDef