Function find_arg

src/infer_intent.rs:384–419

look for @arg=name in mathml if 'check_intent', then look at an @intent for this element (typically false for non-recursive calls)

(rules_with_context: &'r mut SpeechRulesWithContext<'c,'s,'m>, name: &str, mathml: Element<'c>, skip_self: bool, no_check_inside: bool)

/// look for @arg=name in mathml
/// if 'check_intent', then look at an @intent for this element (typically false for non-recursive calls)
fn find_arg<'r, 'c, 's:'c, 'm:'c>(rules_with_context: &'r mut SpeechRulesWithContext<'c,'s,'m>, name: &str, mathml: Element<'c>, skip_self: bool, no_check_inside: bool) -> Result<Option<Element<'m>>> {
    // debug!("Looking for '{}' in\n{}", name, mml_to_string(&mathml));
    if !skip_self {
        if let Some(arg_val) = mathml.attribute_value("arg") {
            // debug!("looking for '{}', found arg='{}'", name, arg_val);
            if name == arg_val {
                // check to see if this mathml has an intent value -- if so the value is the value of its intent value
                if let Some(intent_str) = mathml.attribute_value("intent") {
                    let mut lex_state = LexState::init(intent_str.trim())?;
                    return Ok( Some( build_intent(rules_with_context, &mut lex_state, mathml)? ) ); 
                } else {
                    return Ok( Some( rules_with_context.match_pattern::<Element<'m>>(mathml)? ) );
                }
            } else if no_check_inside {
                return Ok(None);       // don't look inside 'arg'
            }
        }
    }

    if no_check_inside && mathml.attribute_value("intent").is_some() {
        return Ok(None);           // don't look inside 'intent'
    }

    if is_leaf(mathml) {
        return Ok(None);
    }

    for child in mathml.children() {
        let child = as_element(child);
        if let Some(element) = find_arg(rules_with_context, name, child, false, true)? {
            return Ok( Some(element) );
        }
    }

    return Ok(None);               // not present
}

#[cfg(test)]
mod tests {