decal 0.6.0

Declarative DSL for describing scenes and rendering them to SVG or PNG
Documentation 
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use crate::{
    paint::ResourceIri,
    utils::ElementWriter,
};
use std::fmt::{
    Display,
    Formatter,
};

/// The SVG clip path element.
#[derive(Debug, Hash, Eq, PartialEq, Clone, Default)]
pub(crate) struct ClipPath(String);

impl ClipPath {
    /// Builds a [`ClipPath`] by writing SVG content into a buffer.
    ///
    /// # Arguments
    /// - `write_fn`: The closure used to write SVG content into the clip path.
    ///
    /// # Returns
    /// - [`Self`] on success.
    /// - [`std::fmt::Error`] if writing fails.
    pub(crate) fn build<F>(write_fn: F) -> Result<Self, std::fmt::Error>
    where
        F: FnOnce(&mut String) -> std::fmt::Result,
    {
        let mut data = String::new();
        write_fn(&mut data)?;
        Ok(ClipPath(data))
    }
}

impl ResourceIri for ClipPath {}

impl Display for ClipPath {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        let clip_path = ElementWriter::new(f, "clipPath")?.attr("id", (self.iri(),))?;

        if self.0.is_empty() {
            clip_path.close()
        } else {
            clip_path
                .content(|out| out.write_str(self.0.as_str()))?
                .close()
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::test_utils::assert_xml;
    use std::fmt::Write;

    #[test]
    fn renders() {
        let clip_path = ClipPath::build(|out| out.write_str("content")).unwrap();
        assert_xml(
            clip_path.to_string(),
            format!(r#"<clipPath id="{}">content</clipPath>"#, clip_path.iri()),
        );
    }

    #[test]
    fn renders_without_content() {
        let clip_path = ClipPath::build(|_| Ok(())).unwrap();
        assert_xml(
            clip_path.to_string(),
            format!(r#"<clipPath id="{}" />"#, clip_path.iri()),
        );
    }
}