7 files changed, 729 insertions, 0 deletions
diff --git a/src/values/alignment.rs b/src/values/alignment.rs
new file mode 100644
index 0000000..7e9fcab
--- /dev/null
+++ b/src/values/alignment.rs
@@ -0,0 +1,65 @@
+use iced::Alignment;
+
+use super::Value;
+
+#[derive(Debug, thiserror::Error, Clone, PartialEq)]
+pub enum ParseAlignmentError {
+    #[error("cannot parse rotation from empty string")]
+    Empty,
+    #[error("invalid variant")]
+    InvalidVariant,
+}
+
+impl Value for Alignment {
+    type Err = ParseAlignmentError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let s = s.trim();
+
+        if s.is_empty() {
+            return Err(ParseAlignmentError::Empty);
+        }
+
+        match s {
+            "start" => Ok(Self::Start),
+            "center" => Ok(Self::Center),
+            "end" => Ok(Self::End),
+            _ => Err(ParseAlignmentError::InvalidVariant),
+        }
+    }
+
+    fn to_string(&self) -> String {
+        match self {
+            Self::Start => String::from("start"),
+            Self::Center => String::from("center"),
+            Self::End => String::from("end"),
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn can_parse_with_spaces() {
+        assert_eq!(Alignment::from_str("  start"), Ok(Alignment::Start));
+
+        assert_eq!(Alignment::from_str("   center   "), Ok(Alignment::Center));
+
+        assert_eq!(Alignment::from_str("end "), Ok(Alignment::End))
+    }
+
+    #[test]
+    fn cant_parse_invalid_variant() {
+        assert_eq!(
+            Alignment::from_str("middle"),
+            Err(ParseAlignmentError::InvalidVariant)
+        )
+    }
+
+    #[test]
+    fn cant_parse_empty_string() {
+        assert_eq!(Alignment::from_str(" "), Err(ParseAlignmentError::Empty))
+    }
+}
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/length.rs b/src/values/length.rs
new file mode 100644
index 0000000..556f8ff
--- /dev/null
+++ b/src/values/length.rs
@@ -0,0 +1,145 @@
+use std::num::{ParseFloatError, ParseIntError};
+use std::str::FromStr;
+
+use iced::Length;
+
+use super::Value;
+
+#[derive(Debug, thiserror::Error, Clone, PartialEq)]
+pub enum ParseLengthError {
+    #[error("float parsing error: {0}")]
+    ParseFloatError(ParseFloatError),
+    #[error("int parsing error: {0}")]
+    ParseIntError(ParseIntError),
+    #[error("invalid type")]
+    InvalidType,
+    #[error("invalid prefix")]
+    InvalidPrefix,
+    #[error("missing prefix")]
+    MissingPrefix,
+    #[error("cannot parse length from empty string")]
+    Empty,
+}
+
+impl From<ParseFloatError> for ParseLengthError {
+    fn from(value: ParseFloatError) -> Self {
+        Self::ParseFloatError(value)
+    }
+}
+
+impl From<ParseIntError> for ParseLengthError {
+    fn from(value: ParseIntError) -> Self {
+        Self::ParseIntError(value)
+    }
+}
+
+impl Value for Length {
+    type Err = ParseLengthError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let s = s.trim();
+
+        if s.is_empty() {
+            return Err(ParseLengthError::Empty);
+        }
+
+        if !s.contains(|c: char| c.is_ascii_digit()) {
+            match s {
+                "fill" => Ok(Self::Fill),
+                "shrink" => Ok(Self::Shrink),
+                _ => Err(ParseLengthError::InvalidType),
+            }
+        } else {
+            if s.starts_with(|c: char| c.is_ascii_digit()) {
+                return Err(ParseLengthError::MissingPrefix);
+            }
+
+            let (prefix, value) = s.split_at(2);
+            match prefix.to_lowercase().as_str() {
+                "fx" => Ok(Self::Fixed(f32::from_str(value)?)),
+                "fp" => Ok(Self::FillPortion(u16::from_str(value)?)),
+                _ => Err(ParseLengthError::InvalidPrefix),
+            }
+        }
+    }
+
+    fn to_string(&self) -> String {
+        match self {
+            Self::Fill => String::from("fill"),
+            Self::Shrink => String::from("shrink"),
+            Self::Fixed(value) => format!("fx{}", value),
+            Self::FillPortion(value) => format!("fp{}", value),
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn can_parse_fill() {
+        assert_eq!(Length::from_str("fill"), Ok(Length::Fill))
+    }
+
+    #[test]
+    fn can_parse_shrink_with_space() {
+        assert_eq!(Length::from_str("shrink "), Ok(Length::Shrink))
+    }
+
+    #[test]
+    fn can_parse_fill_portion() {
+        assert_eq!(Length::from_str("fp15"), Ok(Length::FillPortion(15)))
+    }
+
+    #[test]
+    fn can_parse_fixed_with_spaces() {
+        assert_eq!(Length::from_str(" fx3.1 "), Ok(Length::Fixed(3.1)))
+    }
+
+    #[test]
+    fn cant_parse_invalid_type() {
+        assert_eq!(
+            Length::from_str("fillportion"),
+            Err(ParseLengthError::InvalidType)
+        )
+    }
+
+    #[test]
+    fn cant_parse_invalid_prefix() {
+        assert_eq!(
+            Length::from_str("f2.0"),
+            Err(ParseLengthError::InvalidPrefix),
+        )
+    }
+
+    #[test]
+    fn cant_parse_invalid_float() {
+        assert_eq!(
+            Length::from_str(" fx2.a"),
+            Err(ParseLengthError::ParseFloatError(
+                f32::from_str("2.a").expect_err("float parse should fail")
+            ))
+        )
+    }
+
+    #[test]
+    fn cant_parse_invalid_integer() {
+        assert_eq!(
+            Length::from_str("fp1a "),
+            Err(ParseLengthError::ParseIntError(
+                u16::from_str("1a").expect_err("integer parse should fail")
+            ))
+        )
+    }
+
+    #[test]
+    fn cant_parse_with_missing_prefix() {
+        assert_eq!(Length::from_str("24"), Err(ParseLengthError::MissingPrefix))
+    }
+
+    #[test]
+    fn cant_parse_empty_string() {
+        assert_eq!(Length::from_str(" "), Err(ParseLengthError::Empty))
+    }
+}
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))
+    }
+}
diff --git a/src/values/padding.rs b/src/values/padding.rs
new file mode 100644
index 0000000..b6d3947
--- /dev/null
+++ b/src/values/padding.rs
@@ -0,0 +1,201 @@
+use std::num::ParseFloatError;
+use std::str::FromStr;
+
+use iced::Padding;
+
+use super::Value;
+
+#[derive(Debug, thiserror::Error, Clone, PartialEq)]
+pub enum ParsePaddingError {
+    #[error("wrong number of values: {0}, expected 1-4")]
+    WrongNumberOfValues(usize),
+    #[error("float parsing error: {0}")]
+    ParseFloatError(ParseFloatError),
+    #[error("missing bracket")]
+    MissingBracket,
+    #[error("cannot parse padding from empty string")]
+    Empty,
+}
+
+impl From<ParseFloatError> for ParsePaddingError {
+    fn from(value: ParseFloatError) -> Self {
+        Self::ParseFloatError(value)
+    }
+}
+
+impl Value for Padding {
+    type Err = ParsePaddingError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let s = s.trim();
+
+        if s.is_empty() {
+            return Err(ParsePaddingError::Empty);
+        }
+
+        if !s.contains(['[', ',', ']']) {
+            let value = f32::from_str(s)?;
+            Ok(Padding {
+                top: value,
+                right: value,
+                bottom: value,
+                left: value,
+            })
+        } else {
+            let values = s
+                .strip_prefix('[')
+                .and_then(|s| s.strip_suffix(']'))
+                .ok_or(ParsePaddingError::MissingBracket)?
+                .split(',')
+                .map(str::trim)
+                .map(f32::from_str)
+                .collect::<Result<Vec<_>, _>>()?;
+
+            match values.len() {
+                1 => Ok(Padding {
+                    top: values[0],
+                    right: values[0],
+                    bottom: values[0],
+                    left: values[0],
+                }),
+                2 => Ok(Padding {
+                    top: values[0],
+                    right: values[1],
+                    bottom: values[0],
+                    left: values[1],
+                }),
+                3 => Ok(Padding {
+                    top: values[0],
+                    right: values[1],
+                    bottom: values[2],
+                    left: values[1],
+                }),
+                4 => Ok(Padding {
+                    top: values[0],
+                    right: values[1],
+                    bottom: values[2],
+                    left: values[3],
+                }),
+                other => Err(ParsePaddingError::WrongNumberOfValues(other)),
+            }
+        }
+    }
+
+    fn to_string(&self) -> String {
+        format!(
+            "[{}, {}, {}, {}]",
+            self.top, self.right, self.bottom, self.left
+        )
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn can_parse_single_value() {
+        assert_eq!(
+            Padding::from_str("[1.5]"),
+            Ok(Padding {
+                top: 1.5,
+                right: 1.5,
+                bottom: 1.5,
+                left: 1.5,
+            }),
+        )
+    }
+
+    #[test]
+    fn can_parse_single_value_without_brackets() {
+        assert_eq!(
+            Padding::from_str("1.5"),
+            Ok(Padding {
+                top: 1.5,
+                right: 1.5,
+                bottom: 1.5,
+                left: 1.5,
+            }),
+        )
+    }
+
+    #[test]
+    fn can_parse_two_values() {
+        assert_eq!(
+            Padding::from_str("[3.2, 6.7]"),
+            Ok(Padding {
+                top: 3.2,
+                right: 6.7,
+                bottom: 3.2,
+                left: 6.7,
+            }),
+        )
+    }
+
+    #[test]
+    fn can_parse_three_values() {
+        assert_eq!(
+            Padding::from_str("[4.8, 8.1,5.9]"),
+            Ok(Padding {
+                top: 4.8,
+                right: 8.1,
+                bottom: 5.9,
+                left: 8.1,
+            }),
+        )
+    }
+
+    #[test]
+    fn can_parse_four_values() {
+        assert_eq!(
+            Padding::from_str("[35.4,74.6 ,53.1, 25.0]"),
+            Ok(Padding {
+                top: 35.4,
+                right: 74.6,
+                bottom: 53.1,
+                left: 25.0,
+            }),
+        )
+    }
+
+    #[test]
+    fn cant_parse_five_values() {
+        assert_eq!(
+            Padding::from_str("[1,2,3,4,5]"),
+            Err(ParsePaddingError::WrongNumberOfValues(5)),
+        )
+    }
+
+    #[test]
+    fn cant_parse_invalid_floats() {
+        assert_eq!(
+            Padding::from_str("[1f,2,3,4]"),
+            Err(ParsePaddingError::ParseFloatError(
+                f32::from_str("1f").expect_err("float parse should fail")
+            ))
+        )
+    }
+
+    #[test]
+    fn cant_parse_with_missing_bracket() {
+        assert_eq!(
+            Padding::from_str("1,2,3,4,5]"),
+            Err(ParsePaddingError::MissingBracket)
+        );
+
+        assert_eq!(
+            Padding::from_str("[1,2,3,4,5"),
+            Err(ParsePaddingError::MissingBracket)
+        );
+
+        assert_eq!(
+            Padding::from_str("1,2,3,4,5"),
+            Err(ParsePaddingError::MissingBracket)
+        )
+    }
+
+    #[test]
+    fn cant_parse_empty_string() {
+        assert_eq!(Padding::from_str(" "), Err(ParsePaddingError::Empty))
+    }
+}
diff --git a/src/values/pixels.rs b/src/values/pixels.rs
new file mode 100644
index 0000000..b2b0047
--- /dev/null
+++ b/src/values/pixels.rs
@@ -0,0 +1,18 @@
+use std::num::ParseFloatError;
+use std::str::FromStr;
+
+use iced::Pixels;
+
+use super::Value;
+
+impl Value for Pixels {
+    type Err = ParseFloatError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        Ok(Pixels(f32::from_str(s.trim())?))
+    }
+
+    fn to_string(&self) -> String {
+        self.0.to_string()
+    }
+}
diff --git a/src/values/rotation.rs b/src/values/rotation.rs
new file mode 100755
index 0000000..90e3f84
--- /dev/null
+++ b/src/values/rotation.rs
@@ -0,0 +1,114 @@
+use std::num::ParseFloatError;
+use std::str::FromStr;
+
+use iced::{Radians, Rotation};
+
+use super::Value;
+
+#[derive(Debug, thiserror::Error, Clone, PartialEq)]
+pub enum ParseRotationError {
+    #[error("float parsing error: {0}")]
+    ParseFloatError(ParseFloatError),
+    #[error("invalid prefix")]
+    InvalidPrefix,
+    #[error("cannot parse rotation from empty string")]
+    Empty,
+}
+
+impl From<ParseFloatError> for ParseRotationError {
+    fn from(value: ParseFloatError) -> Self {
+        Self::ParseFloatError(value)
+    }
+}
+
+impl Value for Rotation {
+    type Err = ParseRotationError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let s = s.trim();
+
+        if s.is_empty() {
+            return Err(ParseRotationError::Empty);
+        }
+
+        if s.starts_with(|c: char| !c.is_ascii_digit()) {
+            let (prefix, value) = s.split_at(1);
+            match prefix.to_lowercase().as_str() {
+                "s" => Ok(Rotation::Solid(Radians(f32::from_str(value)?))),
+                "f" => Ok(Rotation::Floating(Radians(f32::from_str(value)?))),
+                _ => Err(ParseRotationError::InvalidPrefix),
+            }
+        } else {
+            Ok(Rotation::Floating(Radians(f32::from_str(s)?)))
+        }
+    }
+
+    fn to_string(&self) -> String {
+        match self {
+            Self::Floating(value) => format!("f{}", value),
+            Self::Solid(value) => format!("s{}", value),
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn can_parse_without_prefix() {
+        assert_eq!(
+            Rotation::from_str("10.5"),
+            Ok(Rotation::Floating(Radians(10.5)))
+        )
+    }
+
+    #[test]
+    fn can_parse_with_s_prefix() {
+        assert_eq!(
+            Rotation::from_str("  s12.3"),
+            Ok(Rotation::Solid(Radians(12.3)))
+        );
+
+        assert_eq!(
+            Rotation::from_str("S9.4"),
+            Ok(Rotation::Solid(Radians(9.4)))
+        )
+    }
+
+    #[test]
+    fn can_parse_with_f_prefix() {
+        assert_eq!(
+            Rotation::from_str("f16.9"),
+            Ok(Rotation::Floating(Radians(16.9)))
+        );
+
+        assert_eq!(
+            Rotation::from_str("F21.45 "),
+            Ok(Rotation::Floating(Radians(21.45)))
+        )
+    }
+
+    #[test]
+    fn cant_parse_invalid_prefix() {
+        assert_eq!(
+            Rotation::from_str("a6.0"),
+            Err(ParseRotationError::InvalidPrefix)
+        )
+    }
+
+    #[test]
+    fn cant_parse_invalid_float() {
+        assert_eq!(
+            Rotation::from_str("3.a"),
+            Err(ParseRotationError::ParseFloatError(
+                f32::from_str("3.a").expect_err("float parse should fail")
+            ))
+        )
+    }
+
+    #[test]
+    fn cant_parse_empty_string() {
+        assert_eq!(Rotation::from_str(" "), Err(ParseRotationError::Empty))
+    }
+}