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//! `userSpaceOnUse` or `objectBoundingBox` values.
use cssparser::Parser;
use crate::error::*;
use crate::parsers::Parse;
/// Defines the units to be used for things that can consider a
/// coordinate system in terms of the current transformation, or in
/// terms of the current object's bounding box.
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub enum CoordUnits {
UserSpaceOnUse,
ObjectBoundingBox,
}
impl Parse for CoordUnits {
fn parse<'i>(parser: &mut Parser<'i, '_>) -> Result<Self, ParseError<'i>> {
Ok(parse_identifiers!(
parser,
"userSpaceOnUse" => CoordUnits::UserSpaceOnUse,
"objectBoundingBox" => CoordUnits::ObjectBoundingBox,
)?)
}
}
/// Creates a newtype around `CoordUnits`, with a default value.
///
/// SVG attributes that can take `userSpaceOnUse` or
/// `objectBoundingBox` values often have different default values
/// depending on the type of SVG element. We use this macro to create
/// a newtype for each SVG element and attribute that requires values
/// of this type. The newtype provides an `impl Default` with the
/// specified `$default` value.
#[macro_export]
macro_rules! coord_units {
($name:ident, $default:expr) => {
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub struct $name(pub CoordUnits);
impl Default for $name {
fn default() -> Self {
$name($default)
}
}
impl From<$name> for CoordUnits {
fn from(u: $name) -> Self {
u.0
}
}
impl $crate::parsers::Parse for $name {
fn parse<'i>(
parser: &mut ::cssparser::Parser<'i, '_>,
) -> Result<Self, $crate::error::ParseError<'i>> {
Ok($name($crate::coord_units::CoordUnits::parse(parser)?))
}
}
};
}
#[cfg(test)]
mod tests {
use super::*;
coord_units!(MyUnits, CoordUnits::ObjectBoundingBox);
#[test]
fn parsing_invalid_strings_yields_error() {
assert!(MyUnits::parse_str("").is_err());
assert!(MyUnits::parse_str("foo").is_err());
}
#[test]
fn parses_paint_server_units() {
assert_eq!(
MyUnits::parse_str("userSpaceOnUse").unwrap(),
MyUnits(CoordUnits::UserSpaceOnUse)
);
assert_eq!(
MyUnits::parse_str("objectBoundingBox").unwrap(),
MyUnits(CoordUnits::ObjectBoundingBox)
);
}
#[test]
fn has_correct_default() {
assert_eq!(MyUnits::default(), MyUnits(CoordUnits::ObjectBoundingBox));
}
#[test]
fn converts_to_coord_units() {
assert_eq!(
CoordUnits::from(MyUnits(CoordUnits::ObjectBoundingBox)),
CoordUnits::ObjectBoundingBox
);
}
}
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