svgdom 0.7.0

Library to represent an SVG as a DOM.
Documentation 
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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

use {
    Attribute,
    AttributeId,
    AttributeValue,
    Document,
    Node,
    ValueId,
};

// TODO: split
/// Resolve `inherit` and `currentColor` attributes.
///
/// The function will fallback to a default value when possible.
///
/// # Errors
///
/// Will return `Error::UnresolvedAttribute` if an attribute
/// can't be resolved and didn't have a default value.
pub fn resolve_inherit(doc: &Document) {
    let mut vec_inherit = Vec::new();
    let mut vec_curr_color = Vec::new();

    for mut node in doc.descendants().svg() {
        vec_inherit.clear();
        vec_curr_color.clear();

        {
            let attrs = node.attributes();
            for (aid, attr) in attrs.iter_svg() {
                if let AttributeValue::PredefValue(ref v) = attr.value {
                    match *v {
                        ValueId::Inherit => {
                            vec_inherit.push(aid);
                        }
                        ValueId::CurrentColor => {
                            vec_curr_color.push(aid);
                        }
                        _ => {},
                    }
                }
            }
        }

        for id in &vec_inherit {
            resolve_impl(&mut node, *id, *id);
        }

        for id in &vec_curr_color {
            let av = node.attributes().get_value(AttributeId::Color).cloned();
            if let Some(av) = av {
                node.set_attribute((*id, av.clone()));
            } else {
                resolve_impl(&mut node, *id, AttributeId::Color);
            }
        }
    }
}

fn resolve_impl(node: &mut Node, curr_attr: AttributeId, parent_attr: AttributeId) {
    if let Some(n) = node.parents().find(|n| n.has_attribute(parent_attr)) {
        let av = n.attributes().get_value(parent_attr).cloned();
        if let Some(av) = av {
            node.set_attribute((curr_attr, av.clone()));
        }
    } else {
        match Attribute::default(curr_attr) {
            Some(a) => node.set_attribute((curr_attr, a.value)),
            None => {
                warnln!("Failed to resolve attribute: {}. Removing it.",
                        node.attributes().get(curr_attr).unwrap());
                node.remove_attribute(curr_attr);
            }
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use {Document, WriteToString};

    macro_rules! test {
        ($name:ident, $in_text:expr, $out_text:expr) => (
            base_test!($name, resolve_inherit, $in_text, $out_text);
        )
    }

    test!(inherit_1,
"<svg fill='#ff0000'>
    <rect fill='inherit'/>
</svg>",
"<svg fill='#ff0000'>
    <rect fill='#ff0000'/>
</svg>
");

    test!(inherit_2,
"<svg fill='#ff0000'>
    <g>
        <rect fill='inherit'/>
    </g>
</svg>",
"<svg fill='#ff0000'>
    <g>
        <rect fill='#ff0000'/>
    </g>
</svg>
");

    test!(inherit_3,
"<svg fill='#ff0000' stroke='#00ff00'>
    <rect fill='inherit' stroke='inherit'/>
</svg>",
"<svg fill='#ff0000' stroke='#00ff00'>
    <rect fill='#ff0000' stroke='#00ff00'/>
</svg>
");

    test!(inherit_4,
"<svg>
    <rect fill='inherit'/>
</svg>",
"<svg>
    <rect fill='#000000'/>
</svg>
");

    test!(current_color_1,
"<svg color='#ff0000'>
    <rect fill='currentColor'/>
</svg>",
"<svg color='#ff0000'>
    <rect fill='#ff0000'/>
</svg>
");

    test!(current_color_2,
"<svg>
    <rect color='#ff0000' fill='currentColor'/>
</svg>",
"<svg>
    <rect color='#ff0000' fill='#ff0000'/>
</svg>
");

    test!(current_color_3,
"<svg color='#ff0000'>
    <rect fill='currentColor' stroke='currentColor'/>
</svg>",
"<svg color='#ff0000'>
    <rect fill='#ff0000' stroke='#ff0000'/>
</svg>
");

    test!(default_1,
"<svg>
    <rect fill='currentColor'/>
    <rect fill='inherit'/>
</svg>",
"<svg>
    <rect fill='#000000'/>
    <rect fill='#000000'/>
</svg>
");

    test!(unresolved_1,
"<svg font-family='inherit'/>",
"<svg/>
");
}