Function intent_rules

src/speech.rs:82–98

(rules: &'static std::thread::LocalKey<RefCell<SpeechRules>>, doc: Document<'m>, mathml: Element, nav_node_id: &'m str)

fn intent_rules<'m>(rules: &'static std::thread::LocalKey<RefCell<SpeechRules>>, doc: Document<'m>, mathml: Element, nav_node_id: &'m str) -> Result<Element<'m>> {
    SpeechRules::update()?;
    rules.with(|rules| {
        rules.borrow_mut().read_files()?;
        let rules = rules.borrow();
        // debug!("speak_rules:\n{}", mml_to_string(&mathml));
        let mut rules_with_context = SpeechRulesWithContext::new(&rules, doc, nav_node_id);
        let intent =  rules_with_context.match_pattern::<Element<'m>>(mathml)
                    .chain_err(|| "Pattern match/replacement failure!")?;
        if name(&intent) == "TEMP_NAME" {   // unneeded extra layer
            assert_eq!(intent.children().len(), 1);
            return Ok( as_element(intent.children()[0]) );
        } else {
            return Ok(intent);
        }
    })
}

/// Speak the MathML
/// If 'nav_node_id' is not an empty string, then the element with that id will have [[...]] around it