Function catch_errors_building_intent

src/infer_intent.rs:45–59

(rules_with_context: &'r mut SpeechRulesWithContext<'c,'s,'m>, mathml: Element<'c>)

    }

    fn catch_errors_building_intent<'r, 'c, 's:'c, 'm:'c>(rules_with_context: &'r mut SpeechRulesWithContext<'c,'s,'m>, mathml: Element<'c>) -> Result<Element<'m>> {
        if let Some(intent_str) = mathml.attribute_value("intent") {
            // debug!("Before intent: {}", crate::pretty_print::mml_to_string(&mathml));
            let mut lex_state = LexState::init(intent_str.trim())?;
            let result = build_intent(rules_with_context, &mut lex_state, mathml)
                        .chain_err(|| format!("occurs before '{}' in intent attribute value '{}'", lex_state.remaining_str, intent_str))?;
            if lex_state.token != Token::None {
                bail!("Error in intent value: extra unparsed intent '{}' in intent attribute value '{}'", lex_state.remaining_str, intent_str);
            }
            assert!(lex_state.remaining_str.is_empty());
            debug!("Resulting intent: {}", crate::pretty_print::mml_to_string(&result));
            return Ok(result);
        }
        bail!("Internal error: infer_intent() called on MathML with no intent arg:\n{}", mml_to_string(&mathml));
    }
}

// intent             := S ( term property* | property+ | application ) S