flut1/knockout-validator

import RuleType from "./RuleType";
import {INamedRuleBindingValue, RuleBindingValue} from "./RuleBindingValue";
import RuleState from "./RuleState";

const SPECIAL_KEY_OR:string = '$or';

const parseBindingRule = (rule:RuleBindingValue, name:string = null):RuleState =>
{
    switch(typeof rule)
    {
        case 'object':
            if(rule === null)
            {
                return null;
            }
            if(Array.isArray(rule))
            {
                return new RuleState(
                    name,
                    (name === SPECIAL_KEY_OR) ? RuleType.COLLECTION_OR : RuleType.COLLECTION_AND,
                    (<Array<RuleBindingValue>> rule).map(
                        (subRule:RuleBindingValue, index:number) => parseBindingRule(subRule, index.toString())
                    )
                );
            }
            if(rule instanceof RegExp)
            {
                return new RuleState(
                    name,
                    RuleType.REGEX,
                    rule
                );
            }
            return new RuleState(
                name,
                (name === SPECIAL_KEY_OR) ? RuleType.COLLECTION_OR : RuleType.COLLECTION_AND,
                Object.keys(<INamedRuleBindingValue> rule).map(subRuleName => parseBindingRule(rule[subRuleName], subRuleName))
            );
        case 'string':
            return new RuleState(
                name,
                RuleType.REGEX,
                new RegExp(<string> rule)
            );
        case 'boolean':
            return new RuleState(
                name,
                RuleType.CHECKED,
                rule
            );
        case 'function':
            return new RuleState(
                name,
                RuleType.FUNCTION,
                rule
            );
        case 'undefined':
            return null;
        default:
            throw new Error(`validation rule "${rule}" has unsupported type "${typeof rule}"`);
    }
};

export default parseBindingRule;