feat: impl `Value` for `LineHeight` and `ContentFit` (all done)

3 files changed, 188 insertions, 0 deletions

diff --git a/src/values.rs b/src/values.rs
index a788dab..6033d00 100644
--- a/src/values.rs
+++ b/src/values.rs
@@ -1,5 +1,7 @@
 mod alignment;
+mod content_fit;
 mod length;
+mod line_height;
 mod padding;
 mod pixels;
 mod rotation;
diff --git a/src/values/content_fit.rs b/src/values/content_fit.rs
new file mode 100644
index 0000000..053431f
--- /dev/null
+++ b/src/values/content_fit.rs
@@ -0,0 +1,69 @@
+use iced::ContentFit;
+
+use super::Value;
+
+#[derive(Debug, thiserror::Error, Clone, PartialEq)]
+pub enum ParseContentFitError {
+    #[error("invalid variant")]
+    InvalidVariant,
+}
+
+impl Value for ContentFit {
+    type Err = ParseContentFitError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let s = s.trim();
+
+        if s.is_empty() {
+            Ok(Self::default())
+        } else {
+            match s {
+                "fill" => Ok(Self::Fill),
+                "none" => Ok(Self::None),
+                "cover" => Ok(Self::Cover),
+                "contain" => Ok(Self::Contain),
+                "scale_down" => Ok(Self::ScaleDown),
+                _ => Err(ParseContentFitError::InvalidVariant),
+            }
+        }
+    }
+
+    fn to_string(&self) -> String {
+        match self {
+            Self::Fill => String::from("fill"),
+            Self::None => String::from("none"),
+            Self::Cover => String::from("cover"),
+            Self::Contain => String::from("contain"),
+            Self::ScaleDown => String::from("scale_down"),
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn can_parse_with_spaces() {
+        assert_eq!(ContentFit::from_str("    fill"), Ok(ContentFit::Fill));
+
+        assert_eq!(ContentFit::from_str("  none  "), Ok(ContentFit::None));
+
+        assert_eq!(ContentFit::from_str("cover   "), Ok(ContentFit::Cover));
+
+        assert_eq!(ContentFit::from_str("contain"), Ok(ContentFit::Contain));
+
+        assert_eq!(
+            ContentFit::from_str("scale_down"),
+            Ok(ContentFit::ScaleDown)
+        )
+    }
+
+    #[test]
+    fn cant_parse_invalid_variant() {
+        assert_eq!(
+            ContentFit::from_str("clip"),
+            Err(ParseContentFitError::InvalidVariant)
+        )
+    }
+}
diff --git a/src/values/line_height.rs b/src/values/line_height.rs
new file mode 100644
index 0000000..0ea1524
--- /dev/null
+++ b/src/values/line_height.rs
@@ -0,0 +1,117 @@
+use std::num::ParseFloatError;
+use std::str::FromStr;
+
+use iced::Pixels;
+use iced::advanced::text::LineHeight;
+
+use super::Value;
+
+#[derive(Debug, thiserror::Error, Clone, PartialEq)]
+pub enum ParseLineHeightError {
+    #[error("float parsing error: {0}")]
+    ParseFloatError(ParseFloatError),
+    #[error("missing prefix")]
+    MissingPrefix,
+    #[error("invalid prefix")]
+    InvalidPrefix,
+    #[error("cannot parse line height from empty string")]
+    Empty,
+}
+
+impl From<ParseFloatError> for ParseLineHeightError {
+    fn from(value: ParseFloatError) -> Self {
+        Self::ParseFloatError(value)
+    }
+}
+
+impl Value for LineHeight {
+    type Err = ParseLineHeightError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let s = s.trim();
+
+        if s.is_empty() {
+            return Err(ParseLineHeightError::Empty);
+        }
+
+        if s.starts_with(|c: char| !c.is_ascii_digit()) {
+            let (prefix, value) = s.split_at(1);
+            match prefix.to_lowercase().as_str() {
+                "r" => Ok(Self::Relative(f32::from_str(value)?)),
+                "a" => Ok(Self::Absolute(Pixels::from_str(value)?)),
+                _ => Err(ParseLineHeightError::InvalidPrefix),
+            }
+        } else {
+            Err(ParseLineHeightError::MissingPrefix)
+        }
+    }
+
+    fn to_string(&self) -> String {
+        match self {
+            Self::Relative(value) => format!("r{}", value),
+            Self::Absolute(value) => format!("a{}", value.0),
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn can_parse_with_r_prefix() {
+        assert_eq!(
+            LineHeight::from_str("  r3.2"),
+            Ok(LineHeight::Relative(3.2))
+        );
+
+        assert_eq!(
+            LineHeight::from_str(" R6.5 "),
+            Ok(LineHeight::Relative(6.5))
+        )
+    }
+
+    #[test]
+    fn can_parse_with_a_prefix() {
+        assert_eq!(
+            LineHeight::from_str("a9.4 "),
+            Ok(LineHeight::Absolute(Pixels(9.4)))
+        );
+
+        assert_eq!(
+            LineHeight::from_str("A1.3"),
+            Ok(LineHeight::Absolute(Pixels(1.3)))
+        )
+    }
+
+    #[test]
+    fn cant_parse_with_missing_prefix() {
+        assert_eq!(
+            LineHeight::from_str("5.1"),
+            Err(ParseLineHeightError::MissingPrefix)
+        )
+    }
+
+    #[test]
+    fn cant_parse_invalid_prefix() {
+        assert_eq!(
+            LineHeight::from_str("g21"),
+            Err(ParseLineHeightError::InvalidPrefix)
+        )
+    }
+
+    #[test]
+    fn cant_parse_invalid_float() {
+        assert_eq!(
+            LineHeight::from_str("a2f"),
+            Err(ParseLineHeightError::ParseFloatError(
+                f32::from_str("2f").expect_err("float parse should fail")
+            ))
+        )
+    }
+
+    #[test]
+    fn cant_parse_empty_string() {
+        assert_eq!(LineHeight::from_str(" "), Err(ParseLineHeightError::Empty))
+    }
+}