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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,211 @@ | ||
| use num_traits::zero; | ||
|
|
||
| use super::{ | ||
| diff_units_msg2, known_dim, number, CallArgs, CallError, ResolvedArgs, | ||
| }; | ||
| use crate::css::{CssString, Value}; | ||
| use crate::output::Format; | ||
| use crate::sass::functions::color::eval_inner; | ||
| use crate::sass::FormalArgs; | ||
| use crate::value::{Number, Numeric, Quotes}; | ||
|
|
||
| pub fn sass_round(s: &ResolvedArgs) -> Result<Value, CallError> { | ||
| let val: Numeric = s.get(name!(number))?; | ||
| Ok(number(val.value.round(), val.unit)) | ||
| } | ||
|
|
||
| pub fn css_round(s: &ResolvedArgs) -> Result<Value, CallError> { | ||
| let args = s.get_map(name!(kwargs), CallArgs::from_value)?; | ||
| if !args.named.is_empty() { | ||
| let fa = FormalArgs::new(vec![one_arg!(number)]); | ||
| return sass_round(&eval_inner(&name!(round), &fa, s, args)?); | ||
| } | ||
| match args.positional.len() { | ||
| n if n > 3 => { | ||
| return Err(CallError::msg(format!( | ||
| "Only 3 arguments allowed, but {} were passed.", | ||
| args.positional.len(), | ||
| ))); | ||
| } | ||
| _ => (), | ||
| } | ||
| let mut args = args.positional.into_iter(); | ||
| let (strategy, number, step) = | ||
| match (args.next(), args.next(), args.next()) { | ||
| (Some(v0), Some(v1), v2) => { | ||
| match (Strategy::try_from(&v0), v1, v2) { | ||
| (Ok(_), num, None) if num.type_name() == "number" => { | ||
| return Err(CallError::msg( | ||
| "If strategy is not null, step is required.", | ||
| )) | ||
| } | ||
| (Ok(s), num, None) => (Some(s), num, None), | ||
| (Ok(s), num, Some(step)) => (Some(s), num, Some(step)), | ||
| (Err(()), num, Some(step)) => { | ||
| if v0.type_name() == "variable" { | ||
| return fallback(Some(v0), num, Some(step)); | ||
| } else { | ||
| return Err(CallError::msg(format!( | ||
| "{} must be either nearest, up, down or to-zero.", | ||
| v0.format(Format::introspect()), | ||
| ))); | ||
| }; | ||
| } | ||
| (Err(()), step, None) => (None, v0, Some(step)), | ||
| } | ||
| } | ||
| (Some(v), None, _) => (None, v, None), | ||
| (None, ..) => { | ||
| return Err(CallError::msg("Missing argument.")); | ||
| } | ||
| }; | ||
| real_round(strategy.unwrap_or_default(), &number, step.as_ref()) | ||
| .unwrap_or_else(|| fallback(strategy.map(Value::from), number, step)) | ||
| } | ||
|
|
||
| fn real_round( | ||
| strategy: Strategy, | ||
| num: &Value, | ||
| step: Option<&Value>, | ||
| ) -> Option<Result<Value, CallError>> { | ||
| let Ok(val) = Numeric::try_from(num.clone()) else { | ||
| return None; | ||
| }; | ||
| let step = match step { | ||
| Some(step) => { | ||
| if let Ok(v) = Numeric::try_from(step.clone()) { | ||
| if let Some(step) = v.as_unitset(&val.unit) { | ||
| Some(step) | ||
| } else if known_dim(&val) | ||
| .and_then(|dim1| known_dim(&v).map(|dim2| dim1 == dim2)) | ||
| .unwrap_or(true) | ||
| { | ||
| return None; | ||
| } else { | ||
| return Some(Err(CallError::msg(diff_units_msg2( | ||
| &val, &v, | ||
| )))); | ||
| } | ||
| } else { | ||
| return None; | ||
| } | ||
| } | ||
| None => None, | ||
| }; | ||
| let (val, unit) = (val.value, val.unit); | ||
| Some(Ok(number( | ||
| if let Some(step) = step { | ||
| if step.is_finite() { | ||
| if (strategy == Strategy::ToZero) && step.is_negative() { | ||
| (&val / &step).abs().ceil() * step.abs() * val.signum() | ||
| } else { | ||
| strategy.apply(val / step.abs()) * step.abs() | ||
| } | ||
| } else if val.is_finite() { | ||
| if strategy == Strategy::Up && val > zero() { | ||
| Number::from(f64::INFINITY) | ||
| } else if strategy == Strategy::Down && val < zero() { | ||
| Number::from(f64::NEG_INFINITY) | ||
| } else { | ||
| val.signum() / Number::from(f64::INFINITY) | ||
| } | ||
| } else { | ||
| Number::from(f64::NAN) | ||
| } | ||
| } else { | ||
| strategy.apply(val) | ||
| }, | ||
| unit, | ||
| ))) | ||
| } | ||
|
|
||
| fn fallback( | ||
| strategy: Option<Value>, | ||
| number: Value, | ||
| step: Option<Value>, | ||
| ) -> Result<Value, CallError> { | ||
| fn num_arg(v: Value, single: bool) -> Result<Value, CallError> { | ||
| match v { | ||
| v @ Value::BinOp(_) if single => Err(CallError::msg(format!( | ||
| "Single argument {} expected to be simplifiable.", | ||
| v.format(Format::introspect()), | ||
| ))), | ||
| v => super::css_fn_arg(v), | ||
| } | ||
| } | ||
| let mut args = Vec::new(); | ||
| let is_single = strategy.is_none() && step.is_none(); | ||
| if let Some(v) = strategy { | ||
| args.push(v) | ||
| } | ||
| args.push(num_arg(number, is_single)?); | ||
| if let Some(step) = step { | ||
| args.push(super::css_fn_arg(step)?); | ||
| } | ||
| Ok(Value::Call("round".into(), CallArgs::from_list(args))) | ||
| } | ||
|
|
||
| #[derive(Debug, Clone, Copy, PartialEq, Eq)] | ||
| enum Strategy { | ||
| Nearest, | ||
| Up, | ||
| ToZero, | ||
| Down, | ||
| } | ||
|
|
||
| impl Strategy { | ||
| fn apply(&self, val: Number) -> Number { | ||
| match self { | ||
| Self::Nearest => val.round(), | ||
| Self::Up => val.ceil(), | ||
| Self::ToZero => val.trunc(), | ||
| Self::Down => val.floor(), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl Default for Strategy { | ||
| fn default() -> Self { | ||
| Self::Nearest | ||
| } | ||
| } | ||
|
|
||
| impl TryFrom<&CssString> for Strategy { | ||
| type Error = (); | ||
|
|
||
| fn try_from(value: &CssString) -> Result<Self, Self::Error> { | ||
| if value.quotes() != Quotes::None { | ||
| return Err(()); | ||
| } | ||
| match value.value() { | ||
| "nearest" => Ok(Self::Nearest), | ||
| "up" => Ok(Self::Up), | ||
| "to-zero" | "to_zero" => Ok(Self::ToZero), | ||
| "down" => Ok(Self::Down), | ||
| _ => Err(()), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl TryFrom<&Value> for Strategy { | ||
| type Error = (); | ||
|
|
||
| fn try_from(value: &Value) -> Result<Self, Self::Error> { | ||
| if let Value::Literal(s) = value { | ||
| s.try_into() | ||
| } else { | ||
| Err(()) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl From<Strategy> for Value { | ||
| fn from(value: Strategy) -> Self { | ||
| Value::from(match value { | ||
| Strategy::Nearest => "nearest", | ||
| Strategy::Up => "up", | ||
| Strategy::ToZero => "to-zero", | ||
| Strategy::Down => "down", | ||
| }) | ||
| } | ||
| } |
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