usvg 0.2.0

An SVG simplification library.
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 super::prelude::*;


pub fn resolve_pattern_children(doc: &mut Document) {
    let iter = doc.root().descendants().filter(|n| n.is_tag_name(EId::Pattern))
        .filter(|n| n.has_attribute(("xlink", AId::Href)))
        .filter(|n| !n.has_children());
    for node in iter {
        let link = node.clone();
        resolve(doc, node, &link);
    }

    // Remove 'xlink:href' in patterns, because we already resolved everything.
    let iter = doc.root().descendants().filter(|n| n.is_tag_name(EId::Pattern))
        .filter(|n| n.has_attribute(("xlink", AId::Href)));
    for mut node in iter {
        node.remove_attribute(("xlink", AId::Href));
    }
}

fn resolve(doc: &mut Document, mut pattern: Node, linked_pattern: &Node) {
    let av = linked_pattern.attributes().get_value(("xlink", AId::Href)).cloned();
    match av {
        Some(av) => {
            match av {
                AValue::Link(ref_node) => resolve(doc, pattern, &ref_node),
                _ => unreachable!(),
            }
        }
        None => {
            // TODO: test it
            for child in linked_pattern.children() {
                let new_child = doc.copy_node_deep(child);
                pattern.append(new_child);
            }
        }
    }
}