turnilo
Version:
Business intelligence, data exploration and visualization web application for Druid, formerly known as Swiv and Pivot
44 lines • 1.55 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
class RulesEvaluatorBuilder {
constructor(rules, partialRule, otherwiseAction) {
this.partialRule = partialRule;
this.otherwiseAction = otherwiseAction;
this.rules = rules || [];
}
static empty() {
return new RulesEvaluatorBuilder();
}
when(predicate) {
const { rules } = this;
const partialRule = { predicates: [predicate] };
return new RulesEvaluatorBuilder(rules, partialRule);
}
or(predicate) {
const { rules, partialRule } = this;
const newPartialRule = { predicates: [...partialRule.predicates, predicate] };
return new RulesEvaluatorBuilder(rules, newPartialRule);
}
then(action) {
const { rules, partialRule } = this;
const newRule = { ...partialRule, action };
return new RulesEvaluatorBuilder([...rules, newRule]);
}
otherwise(action) {
const { rules } = this;
return new RulesEvaluatorBuilder(rules, undefined, action);
}
build() {
return (variables) => {
for (const rule of this.rules) {
const { predicates, action } = rule;
if (predicates.some(predicate => predicate(variables))) {
return action(variables);
}
}
return this.otherwiseAction(variables);
};
}
}
exports.RulesEvaluatorBuilder = RulesEvaluatorBuilder;
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