Struct Builtin

pub struct Builtin(/* private fields */);

A function implemented in rust that is accessible from within Sass

Usage

use grass_compiler::{
    sass_value::{ArgumentResult, SassNumber, Value},
    Builtin, Options, Result as SassResult, Visitor,
};

// An example function that looks up the length of an array or map and adds 2 to it
fn length(mut args: ArgumentResult, visitor: &mut Visitor) -> SassResult<Value> {
    args.max_args(1)?;

    let len = args.get_err(0, "list")?.as_list().len();

    Ok(Value::Dimension(SassNumber::new_unitless(len + 2)))
}

fn main() {
    let options = Options::default().add_custom_fn("length", Builtin::new(length));
    let css = grass_compiler::from_string("a { color: length([a, b]); }", &options).unwrap();

    assert_eq!(css, "a {\n  color: 4;\n}\n");
}

Implementations

impl Builtin

pub fn new( body: fn(ArgumentResult, &mut Visitor<'_>) -> SassResult<Value>, ) -> Builtin

Trait Implementations

impl Clone for Builtin

fn clone(&self) -> Builtin

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Builtin

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for Builtin

fn eq(&self, other: &Self) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for Builtin