Refactor grouping

crates/pile-value/src/extract/blob/image/transform/pixeldim.rs

@@ -0,0 +1,68 @@
+use serde::{Deserialize, Deserializer};
+use std::fmt;
+use std::str::FromStr;
+
+// TODO: parse -, + (100vw - 10px)
+// TODO: parse 100vw [min] 10
+// TODO: parse 100vw [max] 10
+
+#[derive(Debug, Clone, PartialEq)]
+pub enum PixelDim {
+	Pixels(u32),
+	WidthPercent(f32),
+	HeightPercent(f32),
+}
+
+impl FromStr for PixelDim {
+	type Err = String;
+
+	fn from_str(s: &str) -> Result<Self, Self::Err> {
+		let numeric_end = s.find(|c: char| !c.is_ascii_digit() && c != '.');
+
+		let (quantity, unit) = numeric_end.map(|x| s.split_at(x)).unwrap_or((s, "px"));
+		let quantity = quantity.trim();
+		let unit = unit.trim();
+
+		match unit {
+			"vw" => Ok(PixelDim::WidthPercent(
+				quantity
+					.parse()
+					.map_err(|_err| format!("invalid quantity {quantity}"))?,
+			)),
+
+			"vh" => Ok(PixelDim::HeightPercent(
+				quantity
+					.parse()
+					.map_err(|_err| format!("invalid quantity {quantity}"))?,
+			)),
+
+			"px" => Ok(PixelDim::Pixels(
+				quantity
+					.parse()
+					.map_err(|_err| format!("invalid quantity {quantity}"))?,
+			)),
+
+			_ => Err(format!("invalid unit {unit}")),
+		}
+	}
+}
+
+impl<'de> Deserialize<'de> for PixelDim {
+	fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+	where
+		D: Deserializer<'de>,
+	{
+		let s = String::deserialize(deserializer)?;
+		FromStr::from_str(&s).map_err(serde::de::Error::custom)
+	}
+}
+
+impl fmt::Display for PixelDim {
+	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+		match self {
+			PixelDim::Pixels(px) => write!(f, "{px}"),
+			PixelDim::WidthPercent(p) => write!(f, "{p:.2}vw"),
+			PixelDim::HeightPercent(p) => write!(f, "{p:.2}vh"),
+		}
+	}
+}