implement builtin function random
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@ -18,7 +18,7 @@ The large features remaining are
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order of operations
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special case certain functions (min, max, calc, element, expression, progid, url)
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all builtin selector functions (274 tests)
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content-exists, unique-id, random, min, min
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content-exists, unique-id, min, min
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@extend (~600 tests)
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indented syntax (27 tests)
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a special parser for plain css
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@ -1,5 +1,10 @@
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use std::collections::HashMap;
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#[cfg(feature = "random")]
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use num_traits::{One, Signed, ToPrimitive, Zero};
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#[cfg(feature = "random")]
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use rand::Rng;
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use super::Builtin;
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use crate::unit::Unit;
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use crate::value::{Number, Value};
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@ -75,4 +80,50 @@ pub(crate) fn register(f: &mut HashMap<String, Builtin>) {
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Ok(Value::bool(unit1.comparable(&unit2)))
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}),
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);
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// TODO: write tests for this. how?
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#[cfg(feature = "random")]
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f.insert(
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"random".to_owned(),
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Builtin::new(|mut args, scope, super_selector| {
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max_args!(args, 1);
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let limit = match arg!(args, scope, super_selector, 0, "limit" = Value::Null) {
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Value::Dimension(n, _) => n,
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Value::Null => {
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let mut rng = rand::thread_rng();
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return Ok(Value::Dimension(
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Number::from(rng.gen_range(0.0, 1.0)),
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Unit::None,
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));
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}
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v => return Err(format!("$limit: {} is not a number.", v).into()),
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};
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if limit.is_one() {
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return Ok(Value::Dimension(Number::one(), Unit::None));
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}
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if limit.is_decimal() {
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return Err(format!("$limit: {} is not an int.", limit).into());
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}
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if limit.is_zero() || limit.is_negative() {
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return Err(format!("$limit: Must be greater than 0, was {}.", limit).into());
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}
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let limit = match limit.to_integer().to_u32() {
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Some(n) => n,
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None => {
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return Err(
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format!("max must be in range 0 < max ≤ 2^32, was {}", limit).into(),
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)
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}
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};
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let mut rng = rand::thread_rng();
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Ok(Value::Dimension(
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Number::from(rng.gen_range(0, limit)),
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Unit::None,
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))
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}),
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);
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}
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@ -161,6 +161,7 @@ impl From<f64> for Number {
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from_integer!(u16);
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from_integer!(usize);
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from_integer!(i32);
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from_integer!(u32);
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from_integer!(u8);
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impl Display for Number {
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