signet-checker/index.js

Type checker for signet type system

var signetChecker = (function () {
    'use strict';

    return function (registrar) {

        function checkType(typeDef) {
            try {
                return typeof registrar.get(typeDef.type) === 'function';
            } catch (e) {
                return false;
            }
        }

        function concat(resultList, list) {
            return resultList.concat(list);
        }

        function not(predicate) {
            return function (value) {
                return !predicate(value);
            }
        }

        function checkSignature(ast) {
            var failedTypes = ast.reduce(concat, [])
                .filter(not(checkType));

            return failedTypes.length > 0 ? failedTypes : null;
        }

        return {
            checkSignature: checkSignature,
            checkType: checkType
        };

    }

})();

if (typeof module !== 'undefined' && typeof module.exports !== 'undefined') {
    module.exports = signetChecker;
}