Function parseArg

src/ext/component.js:76–90

(componentEl, prop)

    }

    function parseArg(componentEl, prop) {
        if (typeof prop !== 'string') return null;
        var cache = componentEl._attrsCache || (componentEl._attrsCache = {});
        if (!cache[prop]) {
            var attrValue = componentEl.getAttribute(prop);
            if (attrValue == null) return null;
            try {
                cache[prop] = createParser(tokenizer.tokenize(attrValue)).requireElement("expression");
            } catch (e) {
                console.error("component: failed to parse attrs." + prop + ":", e.message);
                return null;
            }
        }
        return cache[prop];
    }

    function parentContext(componentEl) {
        var parent = componentEl.parentElement;