Function get_node_by_id

src/navigate.rs:247–262

Get the node associated with 'id' This can be called on an intent tree -- it does not make use of is_leaf()

(mathml: Element<'a>, id: &str)

/// Get the node associated with 'id'
/// This can be called on an intent tree -- it does not make use of is_leaf()
fn get_node_by_id<'a>(mathml: Element<'a>, id: &str) -> Option<Element<'a>> {
    if let Some(mathml_id) = mathml.attribute_value("id") {
        if mathml_id == id {
            return Some(mathml);
        }
    }

    for child in mathml.children() {
        if let Some(child) = child.element() {
            if let Some(found) = get_node_by_id(child, id) {
                return Some(found);
            }
        }
    }
    return None;
}

// FIX: think of a better place to put this, and maybe a better interface
pub fn context_get_variable<'c>(context: &Context<'c>, var_name: &str, mathml: Element<'c>) -> Result<(Option<String>, Option<f64>)> {